JPH0451969Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a grinding device, and particularly to one used for grinding a jig for grinding a tapered surface or a tapered hole by mold processing.

(Prior Art and its Problems) In recent years, as this type of grinding device, a multi-tasking machine has been developed in which a machining center having a tool changer also has a grinding function. According to this multi-tasking machine, a grinding tool holder can be selectively and automatically attached to the rotating spindle using a tool change arm, and it can also grind and finish the inner circumferential surface of a hole, flat surface, curved surface, etc. of a workpiece fixed on a table. It has become possible to do this at high speed and with high precision.

However, conventionally used grinding tool holders have a mechanism that adjusts the effective diameter of the tool by moving the grinding wheel axis eccentrically from the spindle center line of the rotating spindle, and a mechanism that moves the grinding wheel axis back and forth in the axial direction, that is, a cycle. Although it is equipped with a stroke drive mechanism, it is not possible to adjust the inclination of the grindstone shaft itself with respect to the center line of the main shaft.

For this reason, for example, deep positioning holes made by mold machining have a draft angle of 0° to 30°, and for such tapered holes, it is necessary to perform grinding while tilting the table and indexing. Nakatsuta.

For this reason, a complicated mechanism such as an index table and complicated feed control are required, and fine adjustment and setting of the table inclination angle is also difficult, making it difficult to easily adapt to the shape of the tapered hole and theme surface of various workpieces. Ta.

(Means for solving the problem) Therefore, the present invention uses a grinding tool holder that can adjust the eccentricity and inclination of the grinding wheel axis with respect to the center line of the main spindle, as well as cycle stroke drive. On the other hand, it is possible to grind without tilting the table, that is, with the workpiece fixed, and by adjusting the tool, it is possible to perform multiple types of grinding such as hole grinding and groove grinding, and it is possible to handle complex table mechanisms and It does not require feed control, has high positioning accuracy, and can perform grinding with extremely high efficiency and precision, especially in machining centers.

In other words, the grinding device of the present invention supports the holder body of the grinding tool holder in such a way that the holding cylinder, which holds the tool support shaft in a slidable manner, is tilt-adjustable around an axis perpendicular to the spindle centerline. A grindstone holder is supported eccentrically with respect to the tool spindle, and a drive section for cycle stroke of the tool spindle is provided to tilt the grindstone holder according to the taper angle and hole diameter of the surface to be ground. Moreover, by adjusting the eccentricity, rotational positioning can be easily performed, and furthermore, with oscillation, highly accurate grinding can be performed.

(Example) Fig. 1 is a sectional view of the device of the present invention, and Fig. 2 is a cross-sectional view of the device of the present invention.
FIG. 3 is a front view of the inclination angle adjustment dial, FIG. 4 is a bottom view of FIG. 1, and FIG. 5 is a diagram illustrating the grinding operation.

Reference numeral 1 denotes a rotating spindle, which is installed in a multi-tasking machining center with an automatic tool change function, and is automatically positioned in the three axes of X, Y, and Z with table feed (not shown) based on various machining data. Rotationally driven by a servo motor.

Reference numeral 2 denotes a grinding holder, which is stored in a tool magazine (not shown) when not in use, and is automatically attached to the rotating main shaft 1 via a tool exchange arm (not shown) when in use.

This grinding tool holder 2 includes a holder body 3, a holding cylinder 4, a cycle stroke drive part 5,
It is composed of a tool support shaft 6, a slide base 7, a slide saddle 8, a grindstone holder 9, an inclination angle adjustment section 10, and an eccentric amount adjustment section 11.

A tapered shank part 12 is formed in the upper part of the holder main body 3. The tapered shank part 12 is fitted into the tapered fitting part 1a of the rotating main shaft 1 and has a clamping pull stud 12a at the tip. The holder body 3 also includes a pair of support arms 13 facing downward.
14 are provided protrudingly facing each other.

The holding cylinder 4 includes the pair of support arms 13 and 14.
It is housed in a space formed between them, and is supported between both support arms 13 and 14 so as to be swingable about an axis C in a direction perpendicular to the main axis center line L of the rotating main shaft 1 . That is, on one side of the holding cylinder 4 on the axis C, a convex shaft 4a is provided to protrude toward the one support arm 13, and on the opposite side, a gear 15, which will be described later and constitutes the inclination angle adjustment section 10, is provided. are integrally fixed with their centers aligned with axis C. The convex shaft 4a is rotatably supported by a bearing 44 fixed to the support arm 13, and is connected to the gear 1.
5 has its gear shaft 15a rotatably supported by a bearing 16 fixed to the support arm 14. Also,
A ring-shaped inner peripheral spline 40 is fitted and fixed inside the holding cylinder 4 via a key 17.

The cycle stroke drive section 5 is formed of an air cylinder, and is integrally fixed to the upper end of the holding cylinder 4 via a mounting flange member 18.
It is connected to a pneumatic circuit that communicates with an air source (not shown) via ports 19 and 20 at both ends.

The tool support shaft 6 is formed of an outer circumferential spline, engages with an inner circumferential spline 40 in the holding cylinder 4, is fixed in the rotational direction, and is guided and held so as to be slidable only in the axial direction. The upper end of this tool support shaft 6 is connected to the piston rod 5a of the air cylinder of the cycle stroke drive section 5, and is configured to perform cycle stroke movement in the axial direction.

The slide base 7 is fixed to the lower end of the tool support shaft 6 at a position where it does not come into contact with the holding cylinder 6. A guide protrusion 21 is formed on the lower surface of the slide base 7 and extends linearly in a direction D that is perpendicular to the spindle center line L and also perpendicular to the axis C. , have tapered guide surfaces 21a, 21a that widen toward each other.

The slide saddle 8 has a slide groove 22 on its upper surface that fits into the guide protrusion 21 of the slide base 7.
is formed, and by fitting this slide groove 22 into the guide protrusion 21, it is guided and supported by both tapered guide surfaces 21a, 21a of the guide protrusion 21 and is attached so as to be slidable in the D direction. . and,
This saddle 8 has a grindstone holder attachment hole 8a formed therein.

The grindstone holder 9 consists of a grinding spindle 23 containing an air turbine and a grindstone 24 attached to the tip of the spindle 23, and is installed in the grindstone holder attachment hole 8a of the slide saddle 8. Further, the air hose 41 from the grinding spindle 23 has a plug 26 at its tip, and this plug 26 is fixedly supported by a support frame 25 that is rotatably fitted and supported on the outer periphery of the holder main body 3. Further, the tip of this plug 26 is connected to the connector 27 on the mounting main body side at the same time that the shank portion 12 is completely mounted on the rotating main shaft 1,
It is connected to the fixed piping 27a of the pneumatic circuit.

That is, the air hose 41, the plug 2
6. The connector 27 and the pneumatic circuit serve as means for transmitting driving force to the grinding spindle 23.

Further, above the support frame 25, the plug 2 is provided.
A contact plate 28 is slidably inserted into the contact plate 6 and is elastically supported via a spring 29.

A stopper 30 with a U-shaped engagement recess is protrudingly provided on one side of the contact plate 29, and when the tool holder 2 is detached from the rotating main shaft 1, the stopper pin 31 on the holder main body 3 side This is to engage and hold the holder main body 3 in a predetermined phase.

As shown in FIGS. 2 and 3, the inclination angle adjustment section 10 includes an inclination angle adjustment dial 32 and a pinion 3.
3 and the above-mentioned gear 15, and a locking mechanism consisting of a tightening nut 34, a bearing 16, a wedge member 35, and the above-mentioned gear 15.

The adjustment dial 32 rotates the gear 15 via a pinion 33 fixed to the tip of a dial shaft 32a rotatably inserted into the support arm 14, and aligns the holding cylinder 4 integral with the gear 15 with the axis. C
The tilt can be adjusted to the desired angle around the center. As shown in FIG. 3, a scale of 0° to 3° is engraved on the adjustment dial 32 or the fixed substrate 36.

The tightening nut 34 is provided to protrude from the outer surface of the support arm 14 so as to be rotatable only with respect to the bearing 16 fixed to the support arm 14, and is screwed into a screw formed at the tip of the gear shaft 15a. Then, the gear 15 is pulled in and pushed out along the axis C.

A tapered portion 16b is provided at the inner peripheral edge of the inner end of the bearing 16.
A wedge member 35 is fixed to the gear 15 so as to engage with the tapered portion 16b, and by engaging and disengaging the wedge engagement, the gear 15 is rotated at a set rotation angle with respect to the holder main body 3. It is designed to lock and unlock automatically.

The eccentricity adjustment section 11 includes an adjustment mechanism consisting of a feed screw 37 whose head is rotatably supported on a support plate 42 attached to the slide base 7 and a female thread 38 formed on the slide saddle 8; The jib 43 is fitted into one side of the guide protrusion 21 of the slide base 7 in the slide recessed hole 22 of the slide saddle 8, and the lock mechanism includes a lock screw 39 that tightens and loosens the jib 43 from the outside of the slide saddle 8. has been done.

That is, the amount of eccentricity is adjusted by rotating the feed screw 37 and sliding the slide saddle 8 in the D direction along the slide base 7.
By tightening the lock screw 39, the slide saddle 8 is firmly clamped to the slide base 7 via the jib 43, and is locked at the set eccentric position.

Also, 45 is a cover on the side of the holder main body 3;
6 is a cover on the slide saddle 8 side.

(Function of the embodiment) As shown in FIGS. 1 to 4, in the holder 2 in which the grinding wheel axis M is aligned with the spindle center line L, circular interpolation inner diameter grinding can be performed by normal X and Y axis control. In addition, in the tool holder 2 in which the saddle 8 is moved in the direction D along the slide base 7 from the state shown in FIG. By rotating the main spindle 1 and rotating the grindstone 24 while keeping the X and Y directions fixed, the inner diameter, contour, surface, etc. of the workpiece W can be ground.

Furthermore, by adjusting the inclination angle of the grindstone shaft M, it is possible to grind a tapered hole and a tapered surface as shown in FIG.

In this case, first, as shown in FIG. 2, by loosening the tightening nut 34 from the side surface of the tool holder 2, the gear 15 is moved slightly to the left to release the binding between the wedge 35 and the tapered surface 16a of the bearing 16, and the gear 15 is released. After that, the adjustment dial 32 is adjusted to rotate in accordance with the inclination angle α of the tapered hole H of the workpiece W.

As a result, the holding cylinder 4 is rotated around the axis C via the pinion 33 and the gear 15, and the grindstone shaft M is tilted by α degrees with respect to the main shaft center line L, as shown by the two-dot chain line in FIG. .

By tightening the tightening nut 34 in this state, the gear shaft 15a is pulled to the right in FIG.
and lock the holding cylinder 4 to the holder main body 3.

Next, the grindstone shaft M is decentered in accordance with the diameter of the tapered hole H.

First, loosen the lock screw 39 to unlock the slide saddle 8 so that it can swing on the slide base 21. Then, adjust the feed screw 11 to match the hole diameter of the tapered hole H, and move the slide saddle 8 as shown in FIG. The grinding wheel shaft M is eccentrically moved by an amount of m with respect to the tool support shaft 6 by moving in the D direction.

In this state, tighten the lock screw 39 and
The saddle 8 is firmly fixed and locked on the guide protrusion 21 of the slide base 21 via the slide base 21.

Therefore, as shown in FIG. 5, the tool is set in a tool structure in which the grindstone shaft M is inclined by α degrees with respect to the spindle center line L and is eccentric by m on the axis C on the same plane.

Next, tapered hole grinding using this tool holder 2 will be explained.

The main spindle 1 is positioned at a predetermined coordinate position on the table by X and Y axis control. air hose 4
1 supplies air pressure to the air turbine of the grinding spindle 23, and the grindstone 24 is driven to rotate at high speed.

Next, the main spindle 1 is moved in the Z-axis direction, and the grindstone 21 at the tip is inserted into the tapered hole H of the workpiece on the table to start grinding.

The main shaft 1 is an AC (not shown) installed on the device main body side.
It is driven to rotate at low speed by a servo motor via a reduction gear.

That is, as shown in FIG. 5, the grindstone 24 rotates around the axis M and revolves around the spindle center line L while maintaining a constant inclination angle α, and grinds the entire inner circumference of the tapered hole H. do.

At this time, at the same time, the tool spindle 6 can be cycle-stroked in the axial direction by the air cylinder 5, whereby the grinding wheel 24 at the tip is oscillated and grinds the entire area from the upper end to the lower end of the tapered hole H at once. .

In addition, the main spindle 1 has a separate main spindle indexing function, and by this indexing rotation and grinding accompanied by X and Y control, grinding can be performed along tapered surfaces and contours of various shapes. A variety of grinding processes such as straight groove grinding and tapered groove grinding are possible based only on stroke oscillation.

Furthermore, by storing a plurality of tool holders 2 with various settings adjusted in this way in the tool magazine, multiple types of grinding can be automatically performed in one machining process by selecting the tool holder 2 by ATC. It can be done in a short time.

The grinding spindle 23 is not limited to one driven by an air turbine, but may be driven by high frequency or gear speed increase, depending on the purpose of grinding.

Furthermore, the inclination angle adjustment section 10 and the eccentricity adjustment section 11
is not limited to the structure of the above-mentioned embodiment, but may employ other structures using, for example, a cam mechanism or a link mechanism.

(Effects of the invention) As explained above, according to the invention, the inclination and eccentricity of the grinding wheel shaft itself of the grinding tool holder can be adjusted according to the taper angle and hole diameter of various surfaces to be ground of the workpiece. When grinding holes and tapered surfaces, it is possible to grind without tilting the table, that is, with the workpiece fixed, and there is no need for a complicated table mechanism or its feed control, stable centering, and highly accurate rotational positioning. can be done. Furthermore, with the cycle stroke movement of the grindstone shaft, complete grinding can be completed in a short time and with high precision.

In addition, since the inclination angle and eccentricity of the grinding wheel axis can be set and adjusted for each type of tapered hole and tapered surface, it can be used for various types of workpieces. Moreover, it is possible to grind vertical surfaces without giving an inclination angle. Ordinary circular interpolation inner diameter grinding is also possible if no eccentricity is given, and straight groove grinding and tapered groove grinding can be easily performed with only oscillation by cycle stroke motion while the rotating spindle is stopped, making it suitable for various grinding applications. By adjusting the tool holder settings accordingly, it is possible to easily handle multiple types of grinding.

In particular, in machining centers, by storing multiple tool holders with various settings in a tool magazine, the automatic tool changer can automatically perform various types of grinding in one machining process by selecting the tool holder. It can be done with efficiency.

Furthermore, since the inclination angle adjustment section and the eccentricity adjustment section each have an adjustment mechanism and a lock mechanism, external adjustment is easy and they can be reliably fixed in the set state.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the device of the present invention, Fig. 2 is a partially cutaway side view seen from the direction A in Fig. 1, Fig. 3 is a front view of the tilt angle adjustment dial, and Fig. 4 is the bottom surface of Fig. 1. FIG. 5 is an explanatory diagram of the grinding operation. 1... Rotating main shaft, 2... Grinding tool holder,
3...Holder body, 4...Holding cylinder, 5...Cycle stroke drive unit, 6...Tool support shaft, 7...
...Slide base, 8...Slide saddle, 9...
...Whetstone holder, 10...Inclination angle adjustment section, 11...
... Eccentricity adjustment section, 32, 33, 15... Inclination angle adjustment dial, pinion and gear that constitute the inclination angle adjustment mechanism, 34, 16, 35, 15... Tightening nut that constitutes the inclination angle locking mechanism, bearing,
Wedge member and gear, 37, 38...Feed screw and female screw constituting eccentricity adjustment mechanism, 4
3, 39... Jib and lock screw that constitute the eccentricity locking mechanism.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a rotating spindle and a grinding tool holder attached to the rotating spindle, the grinding tool holder forming a shank portion to be fitted to the rotating spindle. A holder main body, a holding cylinder supported by the holder main body so as to be able to swing around an axis perpendicular to the spindle center line, a cycle stroke drive unit attached to the holding cylinder, and an axial direction A tool support shaft that is slidably inserted into the tool support shaft and connected to the cycle stroke drive unit to move back and forth in the axial direction within the holding cylinder, a slide base fixed to the tool support shaft, and a slide base fixed to the tool support shaft. A slide saddle supported slidably in a direction perpendicular to the spindle center line on the same plane as the swing plane of the holding cylinder, a grindstone holder attached to the slide saddle, and a tip provided on the grindstone holder. a grinding spindle for rotationally driving a grinding wheel mounted thereon; a driving force transmission means for transmitting driving force to the grinding spindle;
An inclination adjustment section is provided between the holder body and the holding cylinder to adjust the inclination angle of the holding cylinder with respect to the spindle center line, and an inclination adjustment part is provided between the slide base and the slide saddle to adjust the eccentricity of the grindstone holder with respect to the tool spindle. A grinding device comprising: an eccentricity adjusting section for adjusting. (2) The grinding device according to claim 1, wherein the inclination angle adjustment section and the eccentricity adjustment section each include an adjustment mechanism and a lock mechanism.