JPH0911041A - Manufacture of highly precise nut and device thereof - Google Patents

Abstract

PURPOSE: To provide highly precise orthogonality between a nut fastening end face and an internal thread shaft center by using a pitch feeding mechanism provided in a lathe so as to machine an internal thread. CONSTITUTION: In a highly precise nut manufacturing method in which a further finish of a forged material and the like by lathe turning is required, an internal thread machining is carried out by means of a tapping device mounted on a tool rest 1, and a main shaft chuck is opened when this internal thread machining is finished, and then, a finished workpiece is discharged from the rear end of the shaft part in a tap 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing a certain nominal diameter (M16).
Above), the effective screw diameter accuracy, high orthogonality between the nut tightening end surface and the female screw shaft core, surface accuracy of the tightening end surface, flatness, etc. are required, and the shape that should be produced by turning finish using mainly forging material The manufacturing method and manufacturing apparatus of the said nut.

[0002]

2. Description of the Related Art Generally, in the processing of a nut which requires a high orthogonality between a tightening end face and a female screw shaft center as described above, turning which ensures surface accuracy is generally required. Usually, the finishing and the tapping of the internal thread are performed by separate machines. Therefore, there is a problem that it is difficult to stably secure the orthogonality between the turning surface and the female screw shaft core with high accuracy. Further, the tapping machine that is usually used is not a pitch feed mechanism, but a mechanism that is fed by a tap lead along with the progress of the female screw processing, and the effective diameter accuracy of the female screw is unstable. Also,
When higher orthogonality is required, it is customary to perform internal threading using a threaded triangular cutting tool by a threading mechanism of a lathe without removing the spindle from the spindle chuck during turning finishing. However, in this case, the cutting tool needs to be chased several times, and there are problems such as low productivity.Moreover, it is difficult to stably secure the screw accuracy due to wear loss of the cutting edge of the cutting tool. U.

In view of such a point, the present invention utilizes the pitch feed mechanism of a lathe to perform internal threading, and to obtain highly accurate orthogonality between the nut tightening end surface and the internal axis of the internal thread. An object of the present invention is to obtain a method and an apparatus for manufacturing a precision nut.

[0004]

A first aspect of the present invention is a method of manufacturing a nut of high precision, which requires finishing of a forged material or the like by turning, and turning by a tool mounted on a tool post. After the completion, the internal thread is processed by the tap device mounted on the tool post, the spindle chuck is opened when the internal thread processing is completed, and the completed work is taken out from the rear end of the tap shaft. .

A second aspect of the present invention is a high precision nut manufacturing apparatus which requires finishing of a forged material or the like by turning, and is mounted on a tool post of a lathe for turning the tightening end face of the nut. A base plate that is placed and is movable in a direction orthogonal to the axis of the spindle chuck, and is mounted on the base plate, and detachably grips the tap so that the axis of the tap is orthogonal to the moving direction of the base plate. A tap chuck device, a slide plate movably mounted on the base plate in a direction orthogonal to the axis of the tap mounted on the tap chuck device, and a slide plate mounted on the slide plate in a direction parallel to the axis of the tap. A tap gripping device mounted so as to be able to move forward and backward,
It is characterized in that it has a discharge claw that is fixed to the slide plate and that engages with a completed work that is engaged with the tap shaft portion.

A third aspect of the present invention is a high precision nut manufacturing apparatus that requires finishing of a forged material or the like by turning, and is mounted on a tool post of a lathe for turning the tightening surface of the nut. A set block that is placed and movable in a direction orthogonal to the axis of the spindle chuck, and is mounted on the set block, extends in a direction parallel to the axis of the spindle chuck, and has an inner diameter slightly larger than the maximum diameter of the completed workpiece. A guide sleeve, a tap shank that is concentrically arranged in the guide sleeve and has a tap at the tip, and a tap shank that is arranged behind the tap shank and moves back and forth toward the rear end of the tap shank to form a tap shank. And a push center inserted into and engaged with a push center receiving hole formed in the rear end face.

[0007]

[Function] After the turning of the workpiece is completed, the tapping device mounted on the tool post performs the internal thread processing using the pitch feed mechanism of the lathe, and upon completion of the internal thread processing, the spindle chuck is opened and the tap is opened. By retracting and taking out the completed work from the rear end of the tap shaft, turning and female threading can be performed while the workpiece is held on the same spindle chuck, and the height between the nut tightening surface and the female screw shaft center is increased. Accurate orthogonality can be obtained, and the workpiece can be separated from the tap without reversing it, and high productivity can be obtained without time loss due to reversal of the tap. Since the operation of discharging the completed work from the tap shaft portion is performed simultaneously with the mounting and turning operation of the next work on the spindle chuck side, the productivity can be further improved.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3, reference numeral 1 is provided on the front surface of a lathe for turning an end face of a nut or the like, and can be controlled to move in a direction orthogonal to the main axis of the lathe and in the direction of the main axis. A base plate 2 for a tap device is fixed to a predetermined position on the tool rest 1 together with a cutting tool such as a facing tool (not shown). An air chuck 3 is mounted on the base plate 2, and is fixed by an air chuck holder 4 so that the axis of the air chuck 3 is parallel to the main axis of the lathe and at the same height.
A tap 5 is detachably mounted on the axis of the air chuck 3.

On the other hand, on the base plate 2,
Two linear rails 6 and 6 extending in the moving direction of the base plate 2 (the direction orthogonal to the main axis of the lathe) are laid, and a slide plate 7 is mounted on the linear rails 6 and 6 on the linear rails 6 and 6. It is installed so that it can move along. A first air cylinder 8 is installed on the base plate 2 in parallel with the linear rail 6, and a tip of a piston rod 9 of the first air cylinder 8 is connected to the slide plate 7. .

A second air cylinder 10 extending in a direction orthogonal to the linear rail 6 is installed on the slide plate 7, and one side of the second air cylinder 10 is provided with the second air cylinder 10. A robot hand arm 11 extending parallel to the cylinder 10 is mounted slidably in the axial direction. A coupling holder 13 extending in a direction perpendicular to their axes is connected to the distal ends of the piston rod 12 and the robo hand arm 11 of the second air cylinder 10. A hand holder 15 having a robo hand 14 attached to the tip is mounted.

As shown in FIG. 3, the robo hand 14 has a pair of hand members 14a and 14b which move in the vertical direction toward or away from each other.

Further, a discharge claw holder 16 protruding in the same direction as the robo hand arm 11 is fixedly provided on one side of the slide plate 7, and the discharge claw holder 16 has a tip at the end thereof. Two claw pieces 17a, 1 protruding in the direction of the tap 5 and intersecting the upper and lower parts of the tap shaft portion 5a.
A discharge claw 17 having a portion 7a (FIG. 3) is fixed.

In FIG. 1, reference numeral 18 is a stopper with a damper that abuts the side surface of the slide plate 7 and regulates the advance position of the robot hand 14.

4 to 9 are explanatory views of the operation of the above apparatus, and FIG. 4 is a view showing the origin position, in which the spindle chuck 20 is in the open state and the X ₀ position of the tool rest 1 is the spindle chuck 2.
It is co-linear with the zero axis. Then, when the workpiece W is supplied to the spindle chuck 20, the spindle chuck 20 closes and the rotation of the spindle starts as shown in FIG.

Then, the tool rest ₁ is moved to the right in the figure, and as shown in FIG. 6, the position X ₁ where the chamfering tool C ₁ is installed is aligned with the axis of the main shaft. At the same time, it is further advanced in the direction of the spindle chuck 20, and the end face of the work W is cut by the grinding tool C ₁ . When this end face cutting is completed, the tool post 1
Is moved backward and moved to the right so that the position X ₂ where the hole cutting tool C ₂ is installed is on the same line as the axis of the main shaft, and the tool rest 1 is moved forward as shown in FIG. Inner diameter cutting is performed. When the inner diameter cutting is performed in this manner, the tool post 1 is retracted and moved to the right,
After the tap axis position X ₃ is aligned with the axis of the main shaft, the tool W is moved forward to screw the workpiece W by the tap (FIG. 8). When the threading is completed, as shown in FIG. 9, the spindle chuck 20 is opened, the tool rest 1 is retracted, and the machined work W remains held by the tap shaft portion. 1
Returns to the origin position shown in FIG. Thereafter, similarly, the end face processing and the screw processing of the work W are sequentially performed.

On the other hand, as shown in FIG. 6, a grinding tool C ₁
Turret 1 until the next workpiece W is cut.
Is moved by the operation of the first air cylinder 8 in the direction of the air chuck 3 where the tap 5 is mounted to the position where the slide plate 7 comes into contact with the stopper 18 with the damper. The portion is moved to a position where the portion can be clamped, and the two claw pieces 17a, 17a above and below the discharge claw 17 are inserted between the robo hand 14 and the processed workpiece W both above and below the tap shaft portion.

Therefore, after the blade portion of the tap 5 is clamped by the robo hand 14, the second air cylinder 10 is operated and the hand holder 13 is moved forward as shown in FIG. 5
Is pulled out, the work W supported by the tap shaft portion is prevented from moving by the discharge claw 17, and is pushed out from the tap shaft portion and dropped into a predetermined work storage portion.

When the discharge of the work is completed, the hand holder 1
3, the tap 5 is reattached to the air chuck 3, and the slide plate 7 is returned to the origin position away from the air chuck 3 while preparing for the next screw processing.

In order to properly carry out the above-mentioned operation sequence and operation time, the control is performed by electronic control, and in order to cooperate with the spindle operation of the lathe, the spindle chuck operation, and the tool post operation, the NC of the lathe or the like is linked. Combined with the device.

10 to 12 are views showing another embodiment of the present invention, in which a set block 25 of a tapping device is fixedly installed in parallel with a cutting tool or the like (not shown) on a tool rest 1 of a lathe. . The set block 25 includes a work W
Guide sleeve 2 having an inner diameter slightly larger than the maximum diameter of
6, the center axis of the guide sleeve 26 is parallel to and the same height as the main axis of the lathe, and is concentric with the guide sleeve 26.
A tap shank 27 having a tap 5 attached to the tip is provided.

On the rear end surface of the set block 25 (on the side opposite to the tap 5), a main block 28 having left and right side walls 28a having an arcuate section is attached to a mounting flange 28b.
A push center guide portion 29 is attached to the rear end of the main block 28, and a first air cylinder 30 is attached to the rear portion of the push center guide portion 29.

A second air cylinder 31 extending horizontally outward is provided on each of the left and right side walls 28a of the main block 28, and a tap holding pin 33 is fixed to a piston 32 of each air cylinder 31. The tip of the tap holding pin 33 can be engaged with the recess 27a provided in the rear portion of the tap shank 27.

Plunger set blocks 28c, which are integral with the mounting flange 28b, are formed on the upper and lower parts of the main block 28, and the tip of the guide sleeve 26 is formed on the plunger set block 28c. The ball plungers 34 are provided so as to face each other so as to slightly project from the inner surface. The plunger set block 28c has an air injection nozzle 35 formed on the mounting flange 28b side of the ball plunger 34.

On the other hand, the piston 30a of the first air cylinder 30 is provided with a push center 36 having a polygonal cross section, and the push center 36 penetrates the push center guide portion 29 and projects into the main block 28 to be tapped. Shank 27
The front end can be engaged with a polygonal push center receiving hole 37 formed on the rear end surface of the main body.

Next, the operation of the above apparatus will be described with reference to FIGS. 13 to 17.

In FIG. 13, the center line of the guide sleeve 26 of the set block 25 of the tapping device is aligned with the main axis of the lathe by the movement of the tool rest 1 after the end surface cutting of the work W chucked by the main spindle chuck 20 is completed. The state set so that it may be located on a line is shown. In this case, the first air cylinder 30 is operated, the tip of the push center 36 is engaged with the push center receiving hole 37 of the tap shank 27, and the rear end of the tap shank 27 is supported by the push center 36. The tap control pin 33 is retracted by the second air cylinder 31. The guide sleeve 26 contains a plurality of workpieces W that have already been threaded. The workpiece W supports a tap shank 27. The difference between the workpiece outer diameter and the guide sleeve inner diameter, and the workpiece inner diameter and the tap The core height at the tip of the tap 5 is reduced by half the sum of the difference from the shank outer diameter.

Therefore, in order to thread the work W chucked by the spindle chuck 20, when the tap 5 is advanced by the tool rest 1, the tapered tap tip enters into the hole of the work W, The core height of the tap 5 becomes appropriate by the guide of the tapered portion, and then the work W is threaded by the advance of the tap 5.

When the threading of the workpiece W is completed in this manner, the tailmost workpiece of the threaded workpiece engaging with the tap shank 27 is moved forward of the tool rest, that is, the tap 5 as shown in FIG. Along with the forward movement, the work piece chucked by the spindle chuck 20 pushes the work piece backward, and the air jetted from the air jet nozzle 35 moves it onto the push center 36.

After that, as shown in FIG. 15, the spindle chuck 20 is opened, and the threaded work is tapped shank 27.
Engages. Then, as the tool rest 1 retreats, it is moved backward together with the tap shank 27 and further moved to the origin position. At the same time, the opposing second air cylinders 31 are actuated, and the holding pin 33 is projected, the tip of the holding pin 33 engages with the recess 27 a of the tap shank 27, and the tap shank 27 is held by the holding pin 33. .
During this time, the next material supply operation is performed on the spindle chuck.

When the supply of the workpiece W is completed, the spindle chuck is closed as shown in FIG.
Move sequentially to the cutting position, and cutting is performed.

While the cutting process is in progress, the push center 36 is retracted on the tap device side. Therefore, the work W is pulled out from the push center 36, and the work W automatically falls into the completed work storage section below.

When the discharge of the work is completed, as shown in FIG. 17, the push center 36 is moved forward to be fitted into the push center receiving hole 37 at the tip of the push shank 27 or the rear end of the tap shank 27 to support and hold it. The pin 31 is retracted and prepared for the next tap processing.

In the meantime, the cutting work which has been simultaneously performed on the spindle side is completed, and the tap 5 is inserted through the tool rest 1.
Is moved to the threading position and moves forward to perform tapping. Thereafter, similarly, the cutting and threading of the work are repeated.

[0034]

As described above, according to the present invention, after turning the seat surface and the screw inner diameter, the screw is machined using the tap while holding the work with the spindle chuck, so that the squareness accuracy between the seat surface and the screw is achieved. Can be higher. In addition, since the tapping process uses the tool post feed mechanism, the screw effective diameter accuracy is improved, and there is no need to provide a special tap feed mechanism. In addition, since the threaded workpiece is discharged from the rear of the tap shaft, there is no need to reverse the rotation of the tap to discharge the workpiece, improving the effective diameter of the screw and eliminating the time required to return the screw. Productivity can be improved. Furthermore, when the tapping is completed, the spindle chuck is opened, and the tool post can be returned to the home position while the completed work remains on the tap shaft.There is no need for an unloader device for removing the completed work from the spindle chuck. In addition, the work removal and the next work supply / turning can be performed in parallel, and in this respect, there is an effect that productivity can be extremely increased.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a tap device of a high-precision nut manufacturing apparatus according to the present invention.

FIG. 2 is a side view of the apparatus shown in FIG.

FIG. 3 is a front view of the apparatus shown in FIG. 1;

FIG. 4 is an operation explanatory view of the device shown in FIG. 1, showing an origin position.

FIG. 5 is a diagram showing a supply completion state.

FIG. 6 is a diagram illustrating a state in which the end face of the workpiece is cut and a tapping process is simultaneously performed when the discharge operation of the workpiece is started.

FIG. 7 is a view showing a state in which a workpiece undergoes simultaneous inner cutting and tapping completion and a workpiece is discharged.

FIG. 8 is a diagram showing a thread machining state of a work.

FIG. 9 is a diagram showing a screw processing completed state.

FIG. 10 is a plan view showing another embodiment of the tap device of the high-precision nut manufacturing apparatus of the present invention.

11 is a partial cross-sectional front view of the device shown in FIG.

FIG. 12 is a schematic side view of the apparatus shown in FIG. 10;

FIG. 13 is an operation explanatory view of the apparatus of FIG. 10, showing a state immediately before thread machining.

FIG. 14 is a diagram showing a state at the time of completion of threading.

FIG. 15 is a view showing a state in which the spindle chuck is opened after the completion of the threading, and the work remains on the tap shaft portion.

FIG. 16 is a diagram showing a state when a completed work is discharged.

FIG. 17 is a diagram showing a state in which the pushing center has advanced after discharging the work.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Turret 2 Base plate 3 Air chuck 5 Tap 7 Slide plate 8 First air cylinder 10 Second air cylinder 11 Robo hand arm 13 Coupling holder 14 Robo hand 15 Hand holder 16 Discharge claw holder 17 Discharge claw 18 Stopper with damper 20 Spindle chuck 25 Set block 26 Guide sleeve 27 Tap shank 28 Main block 29 Push center guide 30 First air cylinder 31 Second air cylinder 33 Tap holding pin 34 Ball plunger 36 Push center 37 Push center receiving hole

Claims (7)

[Claims] 1. A method for manufacturing a nut with high precision, which requires finishing of a forged material or the like by turning, is mounted on the tool post after turning by a tool mounted on the tool post is completed. The internal thread is processed by the tapping device that is installed, and the spindle chuck is opened when the internal thread processing is completed.
A method for manufacturing a high precision nut, characterized in that the completed work is taken out from the rear end of the tap shaft portion. 2. After the completion of the female screw machining, the tool post is returned to the origin position while leaving the finished work on the tap shank, and then the tap is temporarily removed from the tool post to take out the finished work from the rear end of the tap shank. The method for manufacturing a high-precision nut according to claim 1, wherein 3. After completion of the female screw machining, the finished work is left on the tap shaft portion, and then the finished work is sequentially moved to the rear of the tap shaft, and the tapping pin is retracted to discharge the finished work. The method for producing a high-precision nut according to claim 1, wherein the method is performed. 4. A high precision nut manufacturing apparatus which requires finishing of a forged material or the like by turning, is mounted on a tool post of a lathe for turning the tightening end face of the nut, and the spindle. A base plate movable in a direction orthogonal to the axis of the chuck; and a tap chuck device mounted on the base plate and detachably gripping the tap so that the axis of the tap is orthogonal to the moving direction of the base plate. , A slide plate mounted on the base plate so as to be movable in a direction orthogonal to the axis of the tap mounted on the tap chuck device, and mounted on the slide plate so as to be movable back and forth in a direction parallel to the axis of the tap. Ejection that engages with the completed tap gripping device that is fixed to the slide plate and that engages with the completed work that is engaged with the tap shaft portion. And having the door, the manufacturing apparatus of high precision nut. 5. The discharging claw has a claw piece that intersects with the tap above and below the tap mounted on the tap chuck device when the slide plate moves to the tap chuck device side. Item 4. A high precision nut manufacturing apparatus according to item 4. 6. A high precision nut manufacturing apparatus which requires finishing of a forged material or the like by turning, is mounted on a tool post of a lathe for turning the tightening surface of the nut, and the main spindle. A set block movable in a direction orthogonal to the axis of the chuck, a guide sleeve mounted on the set block, extending in a direction parallel to the axis of the spindle chuck, and having an inner diameter slightly larger than the maximum diameter of the finished work; A tap shank that is concentrically arranged in the guide sleeve and has a tap at the tip, and is arranged behind the tap shank, and advances and retreats toward the rear end of the tap shank to the rear end surface of the tap shank. An apparatus for manufacturing a high precision nut, comprising: a press center inserted into and engaged with the formed press center receiving hole. 7. The manufacturing apparatus for a high precision nut according to claim 6, wherein the tap shank is supported by tap retaining pins which are arranged so as to face each other in the radial direction and which can be moved forward and backward. .