JPH0373202A - Lead processing tool post device and NC lead processing device using the tool post device - Google Patents

Abstract

PURPOSE:To significantly improve the accuracy in lead machining by movably supporting the slides provided to the extended end parts of a linear-motor rotor by air bearings of slide bases. CONSTITUTION:A linear motor 3 consisting of a stator 20 fitted to a table 12 and a rotor 26 capable of being moved in the axial direction inside the stator 20 is provided, and to the extended end part of this rotor 26, a slide 25 is provided. Further, the slides 17, 25 are movable supported by air bearings 40 on the slide bases 22 fitted to the table 12, and a tool fitting part 42 is provided to the slide 25. In this manner, the slides 17, 25 are directly connected to the linear motor 3 fitted to the table 12 so as to form an integrated structure, and since no transmission system such as ball screw or the like is interposed between the linear motor and the slides, heat and friction or the like due to the mechanical contact of the transmission system is not caused, and machining accuracy can be improved. Further, since the slides 17, 25 move integrally with the linear direct motion of the linear motor, they can be subjected to linear reciprocating motion without causing delay.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a lead processing tool post device that reciprocates a blade mounting slide at high speed, and a lead processing tool post device that uses the lead processing tool post device to attach tape to a VTR cylinder. The present invention relates to an NC lead processing device that can perform high-speed processing of leads such as lead shapes that serve as guides during travel.

[Conventional technology]

Conventionally, a cam copying method has been known for lead machining using a lathe, which requires high precision. According to this method, a cam corresponding to the lead shape of the workpiece is rotated synchronously with the rotation of the main shaft, that is, the rotation of the workpiece, and a cam follower that presses against the cam moves back and forth following the cam shape. This movement is transmitted to the cutting tool and the desired lead shape is machined into the workpiece. However, due to problems with the followability of the cam follower that follows the cam, it is almost impossible to make the lead part steeply sloped or to have a delicately sloped shape. If chips etc. enter, the machining accuracy will decrease, and if the shape of the turning process is changed, the cam must be replaced.
The production of R cylinders has the problem of requiring the cam to be removed and reinstalled each time for accuracy adjustment, which is dependent on the skill of the worker.

Therefore, a method has been attempted in which a well-known NC lathe is used to perform lead machining on a workpiece. According to this method, the spindle with the workpiece attached is rotated at a constant speed, and the cutting tool attached to the tool post is operated based on numerical information based on the required shape of the workpiece, and cutting is performed using a variable thread cutting method. It's a method. In other words, the workpiece is either right-handed and left-handed threaded at equal pitches, or right-handed threaded with a certain pinch, then left-handed threaded with a different pitch, and then turned into the desired shape. There is.

Further, for example, Japanese Patent Publication No. 62-43801 discloses a method and apparatus for turning a workpiece having a circular cross-sectional shape. This method for turning a workpiece and its apparatus will be outlined with reference to FIG. 15. The turning apparatus shown in FIG. 15 is mainly driven by a headstock 64 having a main spindle 63 to which a workpiece 60 is attached, a spindle motor 72 that drives the main spindle 63 via a drive belt 71, and a DC servo motor. It is equipped with a cutting tool 62 attached to a slider 61 and an NC device. This turning processing apparatus has the following points: the spindle motor 72 serves as the drive source for the main shaft 63 only for processing other than lead processing, the low-speed DC servo motor 65 is provided as the drive source for lead processing, and the rotation of the main shaft 63 The point is that a position coder 70 for angle detection is provided. A gear 66 is attached to the output shaft 67 of the DC servo motor 65, and the gear 66 is connected to the main shaft 63 during lead processing.
It is configured to mesh with a gear 68 attached to.

The boo 1J69 attached to the main shaft 63 is a pulley with a built-in clamp, and is configured to disconnect the main shaft 63 and the spindle motor 72 during lead processing. on the other hand,
During turning processing other than lead processing, the main shaft 63 and the spindle motor 72 are connected via the pulley 69 and the drive belt 71 by the clutch, and the engagement between the gears 68 and 66 is achieved by, for example, moving the gear 66 in the vertical direction. It is released by pressing the cylinder.

Furthermore, Japanese Patent Application Laid-Open No. 63-283835 discloses a linear movement device. The linear moving device has a slider supported by a hydrostatic air bearing in a non-contact state with respect to the slide shaft, and the slider is provided between the slide shaft and the slide shaft and is moved in the axial direction of the slide shaft by a near motor. A coil constituting a linear motor is provided in the axial direction of the slide shaft, a magnet facing the coil is provided on the slider, and an air supply path for supplying air to the hydrostatic air bearing is formed on the slider. This is what is being done.

[Problem to be solved by the invention]

However, according to the method of performing lead machining on a workpiece using an NC lathe, there are limits to the acceleration and movement speed of the cutting tool, and when the rotation speed of the lathe spindle to which the workpiece is attached is increased, a follow-up delay occurs. This appears as an error in the machining shape of the workpiece. Furthermore, a fatal flaw is that there is a limit to the machining accuracy and, for example, it is not possible to achieve a straightness of a few micrometers as required for the lead portion of a VTR cylinder.

Therefore, the applicant filed the earlier patent application No. 63-335.
In the lead processing tool rest device disclosed in No. 357,
The present invention provides a lead processing tool rest device that is applicable to an NC lead processing device that can perform lead processing on cylinders and the like used in VTRs at high speed. That is, the lead processing tool post device has a servo motor attached to a table facing the workpiece, a cutter fixing slide attached to the drive shaft of the servo motor so that it can reciprocate without using a coupling, and causing the blade mounting slide to reciprocate at high speed without delaying the rotation angle of the servo motor;
Further, by supporting the blade mounting slide via an air bearing, friction in the sliding portion is eliminated, stick-slip is prevented from occurring, and the response of the blade mounting slide to the motor rotation angle is improved.
A lead processing tool post device has been disclosed that can forcibly cool the blade mounting slide and the servo motor to suppress heat generation and achieve smooth operation.

However, regarding the lead processing tool post device,
We can provide a device with good responsiveness, high-speed reciprocating motion without rattling, and high precision, but it also supports the drive shaft of the ball screw and slide to convert rotary motion into linear motion. Since the ball screw and bearings are equipped with a bearing that can handle the workpiece, it is necessary to configure the ball screw and bearing with high precision in order to improve the machining accuracy of the workpiece. However, there are also problems with the accuracy of the ball screw itself, so The presence of mechanical contact points causes wear, heat generation, etc., making it difficult to increase processing accuracy, and also requires related parts to be highly accurate.

The purpose of this invention is to solve the above problems,
To provide a lead processing tool post device applicable to an NCIJ-de processing device, which can perform lead processing on cylinders used in VTRs, etc. at high speed, similar to the lead processing tool post device described above. Furthermore, by using a linear motor instead of a servo motor, the advantages of the linear motor can be effectively utilized, and an extremely practical tool post device for lead processing can be provided with a simple structure and easy maintenance. It is something to do.

Specifically, the present invention includes a linear motor mounted on a table facing a workpiece, both ends of the rotor shaft of the linear motor being slides with a square cross section, and a blade fixing slide with a blade fixed to one slide. The other slide is configured as a reaction force slide, and the linear motor's linear motion directly causes the blade mounting slide to reciprocate at high speed, and the blade installation slide and the reaction force slide are supported via air bearings. This eliminates friction in the sliding parts, prevents the occurrence of stick-slip, improves the response of the blade mounting slide to linear translational motion, and also forces cooling of the blade mounting slide and the linear motor. An object of the present invention is to provide a lead processing tool post device that suppresses heat generation, achieves smooth operation, and improves processing accuracy.

Another object of the present invention is to solve the above-mentioned problems, and to provide an NC lead processing device that can perform lead processing on cylinders used in VTRs at high speed. A built-in motor that accurately holds and fixes the workpiece in the clamping means provided in the machine, giving the workpiece the rotation necessary for cutting, and eliminates the need to drive the headstock as a means of rotating the spindle from the outside using a belt, etc. The headstock is fixed on an NC-controlled X-Z moving table, and the workpiece held at the end of the spindle is rotated and moved, and the workpiece is placed on the table opposite to the workpiece. In this method, a cutting tool suitable for the shape of the workpiece is set on the tool rest, the tool rest is fixed on the table, and the tool rest is moved only by the depth of cut relative to the workpiece to eliminate the occurrence of vibration. , when a workpiece rotating at high speed comes into contact with the cutting tool,
Machining the workpiece into the desired lead shape, performing NG control, repeating the movement of the X-Z table, and machining the final target lead shape onto the outer circumferential surface of the workpiece.
An object of the present invention is to provide a C-lead processing device.

[Means to solve the problem]

In order to couple the above objects, the present invention is configured as follows. That is, the present invention provides a linear motor comprising a stator attached to a table and a movable element that is movable in the axial direction within the stator, a slide provided at an end extension of the movable element, and a slide attached to the table. The present invention relates to a tool post device for die cutting, which includes a base, an air bearing that movably supports the slide on the slide base, and a cutter mounting portion provided on the slide.

Further, in this lead processing tool post device, the outer shape of the slide is formed to have a rectangular cross section, and the air pressure receiving area that supports the slide on the side that affects processing accuracy is formed to be larger than the other air pressure receiving area. , an air escape groove is formed in the slide base to allow air from the air bearing to escape.

Further, in this lead processing tool post device, the slides are provided at both end extensions of the mover, a cutter is attached to the cutter attachment portion of one of the slides, and the cutter is attached to the cutter attachment portion of one of the slides, and the cutter is attached to the cutter attachment portion of one of the slides. The structure is such that cooling air is sent into the gap between the inner circumferential surface of the stator and the outer circumferential surface of the movable element.

Alternatively, in this lead processing tool post device, the cooling air supplied to the air bearing between the slide and the slide base, the cooling air supplied between the movable element and the stator of the linear motor, and the cutter. The cooling oil supplied to the machining part of the workpiece to be machined is controlled to be cooled to the same temperature by a cooling device.

Further, the present invention provides a spindle means that is fixed on an NCwi-controlled X-Z moving table and incorporates a servo motor that provides rotation necessary for cutting the workpiece, and a spindle means that holds and positions the workpiece provided on the spindle means. a clamping means, a table set at a position facing the workpiece held by the clamping means, a slide attached to the table or provided on the end extension of a linear motor, a mover of the linear motor;
a slide base attached to the table; an air bearing movably supporting the slide on the slide base;
and a cutter attachment part provided on the slide, and the cutter attached to the slide repeats reciprocating motion corresponding to the rotation angle of the workpiece held by the spindle means.

[Effect]

This invention is configured as described above and operates as follows. That is, this lead processing tool post device includes a linear motor consisting of a stator attached to a table and a movable element that is movable in the axial direction within the stator, a slide provided on an extension of the end of the movable element, and the The structure includes a slide base attached to a table, an air bearing that movably supports the slide on the slide base, and a blade attachment section provided on the slide, so that the slide is directly connected to the linear motor attached to the table. It has an integral structure, and there is no transmission system such as a ball screw interposed between the linear motor and the slide, so that heat generation, friction, etc. due to mechanical contact of the transmission system does not occur, and machining accuracy can be improved. Further, since the slide moves integrally with the linear direct motion of the linear motor, linear reciprocating motion can be performed without delay, and the slide is connected to the slide base attached to the table via the air bearing. Because it supports the slide base and the slide, friction, wear, heat generation, etc. do not occur between the slide base and the slide, and there is no stick-sleeve or rattling, and the rotation of the workpiece is prevented. The response to the relative motion between the motion and the linear motion of the cutter can be improved, and high-speed reciprocating motion becomes possible.

In addition, since an air escape groove is formed in the slide base so that the air pressure receiving area supporting the blade mounting slide on the side that affects machining accuracy is larger than other air pressure receiving areas, the slide of the blade mounting slide Surface sealing can be easily achieved.

Moreover, if the slide base or the slide is coated with a ceramic material or the bottom is made of a ceramic material, metal-to-metal sliding can be avoided even when the air pressure of the air bearing decreases. This can prevent burn-in and other problems.

Furthermore, since cooling air is sent into the gap between the inner circumferential surface of the stator and the outer circumferential surface of the movable element, the cooling air is blown directly onto the coils of the linear motor, thereby quickly and reliably cooling the heat generating parts. It is possible to prevent the occurrence of adverse effects due to heat.

Furthermore, since the cooling air supplied to the air bearing, the cooling air supplied to the linear motor, and the cooling oil supplied to the processing portion of the workpiece are controlled to the same temperature by the cooling means, the lead processing tool post device itself There are no local temperature differences between parts, and no expansion or contraction occurs due to temperature differences between parts, improving the machining accuracy of the workpiece.

Alternatively, the NC lead machining device using this lead machining turret device has a series of cutting operations that are almost the same as lead machining using a conventional NC lathe, but the major difference is that the conventional NC lathe is In contrast to the workpiece that is rotated at high speed and is brought close to the workpiece to cut the workpiece into the desired shape, in the NCIJ-cutting machine according to the present invention, the cutting tool is not fixed except for giving the cutting feed to the workpiece. It is possible to perform lead machining on the outer peripheral surface of the workpiece by attaching it to a certain position, bringing the workpiece that is rotating at high speed close, and moving the workpiece according to the shape to be machined. Also,
In general, a cutting tool post that repeatedly moves back and forth at high speed is
Although it is the source of vibration, which is the biggest drawback of the machine, the lead processing turret device of this high-speed NCIJ-do processing machine is attached to the machine body via a table, so it has excellent mechanical rigidity. . Therefore, in the NC cutting device according to the present invention, since there is no X-Z moving slide on the tool rest, which is the cause of backlash, lead machining can be speeded up without vibration etc.
Improved accuracy can be measured.

〔Example〕

Hereinafter, an embodiment of a lead processing tool rest device according to the present invention will be described with reference to FIGS. 1, 2, 3, 4, 5, and 6.

In FIG. 1, a lead processing tool rest device according to the present invention is indicated generally by the reference numeral 2. In FIG. The lead processing tool post device 2 according to the present invention mainly consists of a stator 20 provided on a table 12 and a movable element 26 that is movable in the axial direction within the stator 20.
Slides 17 and 25 fixed to the slide connecting member 18 to which 6 was attached, and the slide base 2 fixed to the table 12
2. Slide base 2 allows slide 17.25 to be moved
2, a tool holder 42 attached to the slide 17, a removable cutter 4 attached to the tool holder 42, and a linear scale 21 attached to the other slide 25. Each tank bottom will be explained in detail.

This lead processing tool post device 2 has the function of applying the linear translational motion of the linear motor 3 to a slide 17 for mounting a cutter, that is, a cutter 4, and a slide 25 on the opposite side from where the tool 4 is attached, to reciprocate motion. It has the following.

The table 12 is fixedly installed in, for example, an NCIJ-do processing device to be described later, and a bracket 29 is fixed to the center of the table 12 with a bolt 37 (see FIG. 4). . Further, mounting portions of the slide base 22 are fixed to both sides of the table 12 via a tapered plate 23 with bolts or the like. Taper plate 23
has a function of making the height of the slide base 22 adjustable with respect to the table 12.

Furthermore, the linear motor 3 and the slide base 22 are arranged linearly in the longitudinal direction on the table 12.

As shown in FIG. 3, the casing 19 is fixed to the outer periphery of the bracket 29 with bolts or the like, and the central magnetic pole 35 made of a magnetic material is fixed to the inner periphery of the bracket 29 with bolts or the like. A stator 2 made of a permanent magnet or the like is mounted on the inner peripheral surface of the casing 19.
0 is fixed by fitting or the like. A movable element 26 is arranged between the inner circumferential side of the stator 20 and the outer circumferential side of the central magnetic pole 35 so as to be capable of reciprocating movement. A coil 33 is wound around the outer peripheral surface of the movable element 26. Therefore, the coil 33 of the mover 26 is placed in a magnetic field generated between the magnet of the stator 20 placed on the outer circumferential side and the magnetic body of the central magnetic pole 35 placed on the inner circumferential side. . Therefore, by applying current to the movable element 26, the movable element 26 reciprocates in the axial direction with respect to the stator 20 and the central magnetic pole 35 by a stroke ST (see FIG. 3), which constitutes the linear motor 3. I will do it.

Furthermore, as shown in FIGS. 3 and 4, one end portion of the movable member 26 is fixed to the flange portion 38 of the slide connecting member 18. A flange portion 38 formed on the slide connecting member 18
Slide 17 with a bite holder 42 attached to one side of the slide 17
The other side of the flange portion 38 is connected to the mover 2.
6. It passes through the central magnetic pole 35 and the bracket 29 and extends toward the side opposite to the cutter. A slide 25 is connected to an end of the slide connecting member 18 extending toward the side opposite to the cutter.

The slide 17 and the slide 25 are supported by an air bearing 40 so as to be able to reciprocate within both slide bases 22.

In the linear motor 3, a casing 19 that supports the stator 20 is fixed to a bracket 29. This bracket 29 is fixed to the table 12 and includes a cooling air inlet 32 and an air passage 3 communicating with the cooling air inlet 32.
1. Further, the casing 19 is formed with an air passage 2B that communicates with the air passage 31 of the bracket 29. The stator 20 fixed to the casing 19 has an air passage 3 communicating with the air passage 28 of the casing 19.
4 is formed. Therefore, the cooling air supplied from the cooling air inlet 32 is supplied to the gap 27 between the stator 20 and the mover 26 through the air passage 31.28 and then through the air passage 34, and It functions to cool the coil 33.

Therefore, even if the linear motor 3 is driven and the movable element 26 reciprocates at high speed and by a predetermined distance, the gap 27 between the stator 20 and the movable element 26 can be sufficiently cooled with air, so problems caused by heating can be avoided. Does not occur.

Furthermore, a slide 17.25 is supported by an air bearing 40 on a slide base 22 fixed to the table 12 via a tapered plate 23. To attach the cutter, a groove 43 (see Fig. 11) is formed on the side slide 17 on the side of the cutting tool holder 42, and a dovetail 44 (see Fig. 11) formed on the cutting tool holder 42 is fitted into the groove. Both are fixed with bolts etc. Therefore, the cutting tool holder 42 to which the cutter 4 is attached is configured to be extremely easy to attach and detach from the slide 17. In addition, the slide 17 includes the slide 1
A limit switch (not shown) for reciprocating movement of 7 is provided. Therefore, when the linear motor 3 is driven, the movable element 26 reciprocates in the axial direction, and the slide 17 reciprocates with air support relative to the slide base 22 in accordance with the moving distance of the movable element 26. Become. Furthermore,
Two cutting tools 4 can be attached to the cutting tool holder 42. In that case, when lead machining is performed on a workpiece, two cutting tools 4 can be mounted on different surfaces of the workpiece, that is, a surface parallel to the rotation axis of the workpiece. It can be used and used when cutting orthogonal surfaces.

Next, with particular reference to FIGS. 2, 5 and 6, the blade mounting slide 17 is mounted on the slide base 22 with the air bearing 4.
A configuration supported by 0 will be explained. Slide 1
The outer peripheral surface of the slide base 22 is formed to have a square cross section, and the support surface of the slide base 22 is formed to have a square cross section corresponding to the outer peripheral surface. The shape shown in FIG. 2 is square in cross section. The slide base 2z has four plates, that is, a slide base member 45 (fifth plate) forming the bottom surface.
(see figure), a slide base member 46 forming the top surface, and a slide base member 47 forming both sides (see figure 6)
It consists of These slide base members 45
．． 46 and 47 are formed with air introduction passages 49 through which compressed air is supplied from an air supply means (not shown) in order to configure an air bearing 40 between the slide base 22 and the blade mounting slide 17. There is. Slide base 2
2, that is, the slide base members 45, 4
6.47 has a main air introduction groove 50 extending in the longitudinal direction with which the air introduction passage 49 communicates at the central part 53, a large number of branch air grooves 51 extending in the longitudinal direction branching from the main air introduction groove 50, and A large number of air grooves 52 communicating with the branch air groove 51 and air escape grooves 54 and 55 are formed at both ends in the elongated direction. Furthermore, the distance ML+ between the respective air escape grooves 54 formed on the slide base members 45.4'6 disposed on the upper and lower surfaces is the distance ML+ between the respective air escape grooves formed on the slide base members 47 disposed on the side surfaces. 55 distance JAIL! It is set to be smaller. Therefore, the slide base members 47 on both sides
The air pressure receiving area of the upper and lower slide base members 45.
This means that the area is larger than the air pressure receiving area of 46.

Therefore, since the air pressure receiving area of the slide base members 45 and 46 is large, both sides of the slide 17 for mounting the blade can be received with a large force. By the way, when the cutting tool holder 42 with the cutting tool 4 attached thereto is fixed to the cutting tool mounting slide 17 and the cutting tool 4 is used to perform lead processing on a workpiece, the slide base member 47 disposed on the side surface
is the plane in the direction that affects the machining accuracy. In other words, the direction that affects machining accuracy is the direction of machining. The direction is the radial direction connecting the rotation center of I5 and the cutting edge of the cutting tool 4, and this direction is in order to ensure the accuracy of the radial dimension among the machining accuracy.
The support state of the cutting tool 4 in this direction must be made firm. Therefore, the air pressure receiving area on the side that supports the blade mounting slide and affecting the machining accuracy is formed to be larger than the other air pressure receiving area.

Further, it is preferable that the outer circumferential surface of the blade attachment slide 17 is coated with a ceramic material such as aluminum oxide. In some cases, the slide 17 itself can be made of a ceramic material. That is, the gearing between the blade mounting slide 17 and the slide base 22 is as follows:
It is approximately 5 μm to 8 μm, and if the air pressure drops during the operation of the REET' machining turret device, if one sliding surface is made of ceramic material, the air pressure of the air bearing 40 can be reduced. By configuring the structure to avoid a metal-to-metal sliding state even when the friction is reduced, phenomena such as seizure can be prevented from occurring, and the sliding characteristics of the sliding surface can be improved.

Furthermore, with reference to FIG. 10, FIG. 11, and FIG. 12, the case where another cutter 4 is attached to the cutting tool holder 42 will be described. Figure 1O is a front view of the mounting structure, Figure 11 is the
FIG. 12 is a side view of FIG. O, and FIG. 12 is a plan view of FIG. 10. In the above embodiment, the case where two bits 4 are attached to the bit holder 42 has been explained, but in some cases, one bit 4 may be attached depending on the shape of the workpiece.
may be sufficient. When attaching one cutting tool 4 to the cutting tool holder 42, when cutting the workpiece,
It can be set to minimize the influence on machining accuracy. That is, the cutting edge 56 of the cutting tool 4 can be set and mounted so as to be located at the radial center axis 57 of the linear motor 3.

Further, with reference to FIG. 13, an embodiment of a cooling device that can be incorporated into the lead processing tool rest 'IIL2' according to the present invention will be described. This cooling device is slide 17
．． Cooling air supplied to the air bearing 40 between the slide base 25 and the slide base 22, the bracket 2 in the linear motor 3
cooling air supplied to the air passage 31 formed in the casing 19, the air passage 28 formed in the casing 19, the air passage 34 of the stator 20, and the air passage formed in the gap 27 between the stator 20 and the movable element 26; It is also provided to cool the cooling oil supplied to the machining part of the workpiece to be machined by the cutter 4 to the same temperature. This cooling device includes a reserve tank 74, an oil cooler 80 that cools the oil in the reserve tank 74, an oil supply pump 77 that operates to supply cooling oil from the reserve tank 74 to the processing area of the workpiece, and a cooling means for cooling the air, that is, a heat exchanger 81. The reserve tank 74 is divided into two chambers, a heat exchange chamber 75 and an oil supply chamber 76, by a partition plate 90. The oil that cools the machined part of the workpiece and is recovered from the machine part flows from the return pipe 87 through the filter 78 and into the heat exchange chamber 75 . The recovered oil is cooled again to a predetermined temperature by the heat exchanger 82 of the oil cooler 80 disposed in the heat exchange chamber 75, overflows the partition plate 90, and flows into the oil supply chamber 76. The cooled and purified oil is sent through the oil pipe 88 by the operation of the oil supply pump 77 to the workpiece processing section of the lead processing device. Cooling air is supplied to the control pulp 83 from a compressed air source attached to the factory or from a compressor 86.
0 is sent to the heat exchanger 81 installed in the heat exchange chamber 75 of the reserve tank 74 through the heat exchanger 8
The air cooled by oil-to-air heat exchange in step 1 is
The amount of air is controlled by the control pulp 84 and supplied to the air bearing 40, the amount of air is controlled by the control pulp 85 and is supplied from the air inlet 32 of the linear motor 3 to the air passage 31, and then the cooling air are the air passage 28 of the casing 19 and the air passage 34 of the stator 20.
In the drawing, reference numeral 89 indicates a cock for draining the oil in the reserve tank 74, which is introduced into the gap 27 between the stator 20 and the movable element 26 and performs a cooling function for the coil 33 of the movable element 26.

Although one embodiment of the lead processing tool post device according to the present invention has been described above, this invention is not limited to the above embodiment. Other embodiments of the lead processing tool post device according to the present invention are as follows. For example, it can also be configured as shown in FIG. Comparing the lead processing tool post apparatus of this embodiment with the one shown in FIG. 1, they have the same construction except that this embodiment has one slide base 22. Therefore, in FIG. 14, parts that are the same as those in FIG. 1 are given the same reference numerals, and redundant explanations will be omitted. In this lead processing tool post device, a linear motor 3 and one slide base 22 are attached to a table 12. In this case, the length of the air bearing 40 in the slide base 22 in the direction of movement of the slide 17 is sufficiently longer than that of the air bearing 40 shown in FIG. By configuring the air bearing 40 to be long, it is possible to stabilize the support of the slide 17 and prevent a decrease in accuracy. Alternatively, as yet another embodiment of the lead processing tool post device according to the present invention, although not shown, the slide bases 22 are arranged on both sides of the beam near motor 3 in the lead processing tool post device shown in FIG. However, the present invention is not limited to this configuration; for example, two slide bases may be arranged on the table 12 on one side of the linear motor 3, and the slide may be supported by each slide base via an air bearing. It is.

Next, an embodiment of the NC lead processing apparatus according to the present invention will be described with reference to FIGS. 7, 8, and 9. This NCIJ-head processing device uses the above-mentioned lead processing tool rest device.

FIG. 7 is a front view showing an embodiment of the MCI7-do processing apparatus according to the present invention, and FIG. 8 is a plan view of FIG. 7. In this NC lead processing apparatus, a Z-axis moving table 9, which constitutes a part of an x-Z moving table, and a fixed table 12 are attached to a bed 1, which is a main machine stand. An X-axis moving table 12 is mounted on the Z-axis moving table 9, and both tables 9. A Z-axis moving table is configured by lO. The two-axis moving table 9 is
It is moved in the X-axis direction by driving the Z-axis drive servo motor 8. The X-axis moving table 10 also has an X-axis driving servo motor 1 attached to the Z-axis moving table 9.
1, it is moved in the X-axis direction. Furthermore, X
A headstock 7 is mounted on the shaft moving table 12.

A servo motor 15 is incorporated in the headstock 7 to provide the machining rotation necessary to cut the workpiece 5.

The servo motor 15 has a high-speed rotation function suitable for turning a workpiece as an NC lathe, and a low-speed rotation function suitable for cutting as the above-mentioned MCIJ-do processing device. It has the function of rotating. The high-speed rotation or low-speed rotation of the servo motor 15 may be controlled by a command from an NC device, or may be remotely controlled by a changeover switch, or, although not shown, by a control on the X-axis moving table 10. , 2 servo motors for high speed rotation and servo motor for low speed rotation.
Of course, other types of servo motors may be installed. Further, a main shaft 16 of a headstock 7 on the X-axis moving table 10 that is rotationally driven by a servo motor 15 is provided with a clamp 6 that is a chuck for holding a workpiece. At a position facing the workpiece 5 held by the clamp 6, a table 12 for holding a plurality of tool rests 13 and 14 in addition to the lead processing tool rest device 2 is fixed to the bend 1. The tool rests 13 and 14 are used when this device is operated as a general NC lathe. The tool rest device 2 is used when operating this device as an NC lead processing device and performing lead processing on the workpiece 5. The tool post device 2 is a lead processing tool post for performing lead processing on the workpiece 5, and is removably attached to the table 12, and is used to perform lead processing on the outer peripheral surface of the workpiece 5. It is possible to reciprocate in a direction parallel to the axis of rotation of the object 5, that is, in the Z' force direction.

The reciprocating motion of the tool rest device 2 in the Z' force direction is remotely caused by a lead processing drive linear motor 3 that is removably fixed to the table 12. Therefore, this lead processing drive linear motor 3 can also be called a 2'-axis moving linear motor. As the lead processing method for the workpiece 5, the lead processing method disclosed in Japanese Patent Publication No. 62-43801 mentioned above can be applied.

This NC lead processing device is configured as described above and operates as follows. This NC lead processing equipment is
In particular, it is possible to perform lead machining on cylinders used in VTRs at high speed.In other words, the workpiece 5 is accurately and firmly held and fixed in the clamp 6 provided at the end of the main shaft 16, and the cutting The necessary rotation is applied to the workpiece 5 by the operation of the servo motor 15. This servo motor 15 has a built-in type, that is, a type built into the headstock, which eliminates the need to drive the headstock 7 from the outside using a belt or the like. The headstock 7 is an It is fixed on an X-Z moving table consisting of an X-axis moving table 12 whose axial movement is controlled. Therefore, the workpiece 5 held at the end of the main shaft 16 by the clamp 6 is rotated by the servo motor 15, and the Z-axis driving servo motor 8 and Xl1
It is moved in the X-axis-Z-axis direction by the hN driving servo motor 11. In addition, on the table 12 located at a position facing the workpiece 5, the blade 4 that is most suitable for the machining shape of the workpiece 5 is placed in the cutting tool holder 42 of the tool rest device 2, and the tool rest device 2 is placed on the table 12. When the workpiece 5 mounted on the top and rotating at high speed comes into contact with the cutting tool 4, the workpiece 5 is cut into the required machining shape by NC control, and the X-axis moving table 10 and Z-axis moving table 9 The workpiece 5 is cut into the final target shape by repeating the movement in the axis-2 axis direction. During lead machining, the Z'-axis moving linear motor 3 attached to the table 12 is operated in direct proportion to the rotation of the workpiece 5 held by the main shaft 16 by the servo moke I5. That is, every time the workpiece 5 rotates once, the Z'-axis moving linear motor 3 moves forward and backward once, and at the same time as the linear movement, the Z-axis moving table, which is an X-Z moving table, moves forward and backward once. 9 and X-axis moving table 10
This means that each time the workpiece 5 rotates once (that is, each time one lead is fixed), it moves toward the workpiece 5 by a distance of 1VIIt with a cut of several micrometers, as shown in FIG. The fine movement is repeated until the final end is reached (the amount in the longitudinal direction of the lead portion formed on the outer circumferential surface of the workpiece 5, that is, the length L).

That is, this NCIJ-do processing device performs a series of operations for lead processing in a manner similar to that of the conventional NC! It is almost the same as cutting with a machine, but the major difference is that the conventional N
While a C lathe brings the cutting tool close to a workpiece rotating at high speed and cuts the workpiece into the desired shape, the NC lead machining device according to the present invention uses the cutting tool only for feeding the cutting tool. The cutting process is performed by fixing a workpiece in a fixed position, bringing a workpiece rotating at high speed close to the cutting tool, and moving the workpiece in the X-axis-2 axis direction in accordance with the shape of the workpiece to be machined.

〔Effect of the invention〕

The lead processing tool post device and NC lead processing device according to the present invention are configured as described above, and have the following effects.

That is, this lead processing tool post device includes a linear motor consisting of a stator attached to a table and a movable element movable in the axial direction within the stator, a slide provided at an extension of the end of the movable element, and Slide base attached to the table,
Since the slide base includes an air bearing that movably supports the slide, and a blade mounting portion provided on the slide, by passing a current through the movable element, the movable element is axially moved relative to the stator. The linear motor is configured so that the slide can reciprocate in unison with the linear movement of the movable element. Furthermore, since there is no mechanical contact such as a ball screw or bearing in the linear motion transmission system between the linear motor and the slide, the movement can be carried out without wear, friction, heat generation, etc. Since no cracks are generated, the accuracy of lead machining on the workpiece can be greatly improved.

Further, since the slide is supported by the slide base attached to the table via the air bearing so that it can slide back and forth, there is no friction, no wear, no heat generation, and no stick-slip. , the response of the slide to the linear movement of the linear motor can be improved, and high-speed reciprocating movement is possible. Furthermore, if the slide or the slide base is coated with a ceramic material, or if the slide or the slide base is made of a ceramic material, even when the air pressure of the air bearing decreases, metal-to-metal sliding can be maintained. Accordingly, seizure or the like does not occur between the slide and the slide base, and the seizure resistance of the relatively moving portion can be improved.

Further, in this lead processing tool post device, the outer shape of the slide is formed to have a rectangular cross section, and the air pressure receiving area that supports the slide on the side that affects processing accuracy is formed to be larger than other air pressure receiving areas. In addition, since an air escape groove is formed in the slide base to allow air from the air bearing to escape, the sliding surface of the slide can be easily sealed, and even when the air pressure decreases, seizure due to cutting reaction force can be prevented. It can be prevented.

Furthermore, in this lead processing tool post device, the slides are provided on both end extensions of the movable element, a cutter is attached to the cutter mounting portion of one of the slides, and the cutter is attached to the cutter mounting portion of one of the slides, and the air passage is provided through the air passage provided in the linear motor. Since cooling air is sent into the gap between the inner circumferential surface of the stator and the outer circumferential surface of the movable element, the slide can be stably supported in terms of balance on both sides of the linear motor, reducing accuracy. In addition, the cooling air can flow between the movable element and the stator of the linear motor to cool the coil provided on the movable element. Furthermore, if the air pressure is set high, cooling oil, dust, etc. will not enter into the movable element and the stator of the linear motor, and the sealing effect can be improved.

Moreover, in this tool post device for lead processing, cooling air is supplied to the air bearing between the slide and the slide base, cooling air is supplied between the movable element and the stator of the linear motor, and the cutting tool is used to process the lead. Since the cooling oil supplied to the machining part of the workpiece to be processed is controlled to the same temperature by the cooling device, the slide,
The temperature of the slide base, the movable element of the linear motor, and the stator of the linear motor can always be controlled at the same state, that is, at the same level, and there is no partial or local temperature difference between each component. There is no difference in thermal expansion between the two, and even high-speed sliding motion is achieved smoothly, making it possible to stabilize and improve machining accuracy, ensuring uniform product quality and high reliability. Become something.

Further, an NC lead processing device incorporating this lead processing tool post device includes a spindle means fixed on an NC-controlled X-Z moving table and incorporating a servo motor that provides rotation necessary for cutting a workpiece. A clamp means for holding and positioning a workpiece provided on the spindle means, a table set at a position facing the workpiece held by the clamp means, a near motor attached to the table, and an end of a mover of the linear motor. It consists of a slide provided on the extension part, a slide base attached to the table, an air bearing that movably supports the slide on the slide base, and a blade attachment part provided on the slide, and the blade attached to the slide is Since the structure consists of repeating reciprocating motion corresponding to the rotation angle of the workpiece held on the spindle means, the support structure of the tool rest, that is, the slide base, which is reciprocated by the linear motor, has a high mechanical rigidity. Excellent, since each slide part is located on the workpiece side, and the slide part only moves linearly on the cutting tool side, gaps do not accumulate and no backlash occurs when the slide moves back and forth. The occurrence of vibrations and the like can also be reduced, and the speed of the cutting tool post can be increased. As a result, the acceleration of the slide can also be improved to around LOG. That is, in general, the tool rest device, which repeatedly moves back and forth at high speed, is the source of vibration, which is the biggest drawback of the machine, but in this NC lead processing device, the slide base is connected to the machine body, that is, via a table fixed to the bed. During cutting, the linear motor simply provides feed to form the machining shape of the lead relative to the workpiece.
Excellent mechanical rigidity. Therefore, like the conventional one, a lead processing tool rest is provided on the x-z moving table,
Compared to the case where the gap between each sliding part of the X-Z axis movement accumulates and the lead processing tool rest moves back and forth, it causes backlash and vibration, but this NC lead processing equipment Since there is no tool rest on the X-Z moving slide, which is the cause of backlash, there is no generation of vibrations, etc., and the speed of the slide of the lead processing tool rest device can be increased, and the machining accuracy is reduced due to vibration. It is possible to improve accuracy without being hindered.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a lead processing tool rest device according to the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a sectional view of the main part of FIG. 1, and FIG. is the line rV-11 in Figure 3.
5 and 6 are internal views showing the slide base shown in FIG. 1, and FIG. 7 shows an NC lead processing apparatus according to the present invention equipped with the lead processing turret device shown in FIG. 1. A front view showing the embodiment, FIG. 8 is a plan view of FIG. 7,
Fig. 9 is a schematic diagram explaining the state of cutting a workpiece, Fig. 10 is a front view showing the mounting structure for attaching another cutting tool to the cutting tool holder, Fig. 11 is a plan view of Fig. 10, and Fig. 12 is a 10 is a side view, FIG. 13 is a schematic view showing an example of a cooling means attached to the lead processing tool post device according to the present invention, and FIG. 14 is another embodiment of the lead processing tool post device according to the present invention. and FIG. 15 are schematic diagrams showing an example of a conventional turning device. 1-----1 bed, 2---turret device, 3.
−−−−1・Linear motor, 4・−・−Bite, 5−−
-1--Workpiece, 7 headstock, 8-...-2-axis drive servo moke, 92-axis moving table, 10...-X-axis moving table, 11--1--X-axis drive servo motor for driving, 12-...-table, 15---main shaft drive servo motor, 16---main shaft, 17.25.
--- Slide, 19 --- Casing, 20
-・----1 stator, 22--・slide base,
26----Mover, 27-------Gap,
29---Bracket, 35---Central magnetic pole, 40---Air bearing, 42---Bite holder, 45, 46, 47---Slide base Members, 28, 31, 34.49...-Air passage.

Claims (5)

[Claims] (1) A linear motor consisting of a stator attached to a table and a movable element that is movable in the axial direction within the stator, a slide provided at the end extension of the movable element, a slide base attached to the table, A lead processing tool rest device comprising an air bearing that movably supports the slide on a slide base, and a blade mounting portion provided on the slide. (2) The outer shape of the slide is formed into a square cross section, and the air from the air bearing is released so that the air pressure receiving area that supports the slide on the side that affects processing accuracy is larger than other air pressure receiving areas. The lead processing tool post device according to claim 1, wherein an air escape groove is formed in the slide base. (3) The slides are provided on both end extensions of the movable element, a cutter is attached to the cutter mounting portion of one of the slides, and an air passage provided in the linear motor is passed between the inner circumferential surface of the stator and the cutter. The lead processing tool post device according to claim 1, wherein cooling air is sent into a gap between the movable element and the outer circumferential surface thereof. (4) Cooling air supplied to the air bearing between the slide and the slide base, cooling air supplied between the movable element and the stator of the linear motor, and the machining area of the workpiece to be machined by the cutter. 2. The lead processing tool post device according to claim 1, wherein the cooling oil supplied to the lead processing tool is controlled to be cooled to the same temperature by a cooling device. (5) a spindle means fixed on an NC-controlled X-Z moving table and incorporating a servo motor that provides rotation necessary for cutting the workpiece; a clamp means provided on the spindle means for holding and positioning the workpiece; Also, a table set at a position facing the workpiece held by the clamping means, a linear motor attached to the table, a slide provided at the end extension of the mover of the linear motor, a slide base attached to the table, It consists of an air bearing that movably supports the slide on a slide base, and a cutter attachment part provided on the slide, and the cutter attached to the slide has a rotation angle corresponding to the rotation angle of the workpiece held on the spindle means. An NC lead processing device that consists of repeating reciprocating motion.