JPS6225295Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a processing device equipped with a special jig suitable for processing a spherical seat on the front surface of a pinion shaft hole in a vehicle, particularly a differential case for an automobile.

``Prior art and its problems'' When the workpiece is a hollow circular body such as a differential case, and the wall inside the pocket is machined with a spherical seat, various processing methods have been developed. Although this method has come to be adopted, the processing equipment becomes complicated because the shape of the workpiece is complicated. For example, when machining a spherical seat on a two-piece workpiece, the tooling and clamper are moved up and down by separate cylinders, and the positioning and offset operations are also performed individually by separate single cylinders. Therefore, there is a problem that the number of actuators increases, which increases the size of the device and increases the number of failures and other problems.

"Problems and Objectives Solved by the Present Invention" The present invention aims to solve the problems in the prior art described above, and its purpose is to improve the movement of tooling and positioning operations for workpieces as well as the clamping. The purpose is to skillfully perform related ping operations using a minimum number of actuators, thereby making the entire device smaller and more compact.

"Means for solving the problem" In this invention, as shown in FIG. 1, a cutter C equipped with a spherical blade is rotatably suspended by a movable tool holder F, while a differential case (hereinafter referred to as the work) W, as is well known, is
Since the center line of the spherical seat S to be machined (which is also the center line of the pinion shaft holes B, B') is largely eccentric to the center line of the tool insertion opening M, first the center of the cutter C is aligned with the opening center line, and then the spherical cutter C is inserted into the pocket P of the work W (see FIG. 1A). Next, as shown in FIG. 1B, either the work or the cutter is offset so that the spherical seat center line and the cutter center line are aligned. Then, as shown in FIG. 1C, the spherical seat S is inserted into the pocket P of the work W from the direction of the arrow.
The cutting tool employs a machining method in which the drive shaft D, which enters through the workpiece B', is spline-coupled with the cutter C, and the cutter is rotated and fed through the drive shaft D to perform plunge cutting to machine the spherical seat. The machining method for machining the spherical seat includes a spherical tool and a tool holder that rotatably holds the tool holder, a movable block that movably supports the tool holder, a lifting member that is made up of a clamper that is connected to a cylinder through a connecting shaft together with the movable block, a long shaft that is inserted laterally into the main body and has a V-groove for supporting the workpiece and a fixed pad,
This device is formed by a lateral movement member consisting of a locating pin and a movable pad that move back and forth in response to the extension and contraction of a cylinder connected to one end of the long shaft, and a transport drive member for a spherical tool, where the lifting member positions the tool and clamps it to the workpiece, the lateral movement member positions the workpiece and performs offset operations, and the transport drive member drives the spherical tool and moves it to the processing position, making it a spherical seat processing device for a differential case.

"Embodiments" The present invention will be described below based on embodiments shown in the second and subsequent drawings.

Figure 2 is a front view of this device.As is clear from this figure, this machine is a two-piece jig, but the
Wa and Wb are set on the same plane with 180 degrees reversed, and the workpiece Wa on the left side of this device in the drawing has a spherical seat on both sides that is unprocessed or one side has been processed, and the workpiece on the right side Work Wb
indicates that one spherical seat has already been machined at the left position of this device, or that both sides have been machined.
In FIG. 2, a plate 4 with a cylinder 5 mounted upside down is attached in a horizontal position to the upper edge of a pair of parallel columns 3 extending vertically upward from both left and right sides of a main body 2 mounted on a base 1. Reference numeral 6 denotes a movable block guided between the pillars 3 and mounted between the main body 2 and the plate 4 so as to be able to rise and fall freely;
As shown in Figures 5 and 8, the through hole 6'' vertically provided in the center of the horizontal member 6' and the through hole 1 of the clamper 9.
The connecting shaft 7 is a three-stage shaft in which a middle portion 7b and a small diameter tip 7a are inserted through the shaft 1'', and its upper large diameter portion 7c is fitted and connected to the rod of the cylinder 5, and a nut 10 is tightened to the lower end. A spring 8 is compressed between the upper end flange 7e of the connecting shaft 7 and a washer 50 placed on the upper surface of the horizontal member 6'. 9 is connected (separately installed) with the cylinder rod 5', and the movable block 6 has its upper ends (7d and 50
It can move up and down by the gap △m created between 11a and 11a.
The lower end of the clamper 6'' is brought into contact (stopped) with the clamper 9. The clamper 9 fixes a pair of parallel plates 13 via fixing pins 12 to the front and rear surfaces of the tall fixing block 11 having the through hole 11'. Frames 16a, 16b are pivotally attached to the frame bodies 16a, 16b by pins 14 implanted on the left and right sides of the parallel plates, and push pieces 17a, 17 are attached to the lower surfaces of the frame bodies 16a, 16b.
a', 17b, 17b', respectively. Four vertical members 1 constituting the main body 2
At the upper end of 8 is the cylindrical upper hub portion H of the workpieces Wa and Wb.
V-shaped grooves 19a, 19a' and 19b supporting the
19b' (see FIGS. 3 and 4), and pressing pieces 17a, 17a' and 17b, 17b' of the clamper 9 are provided opposite to this V-shaped groove, respectively. In particular, as shown in detail in FIGS. 6 and 7, the horizontal member 6' of the movable block 6 has a cross-sectional shape, and is located at the deep end of a spring housing 15 that is horizontally attached to the outer wall of this one side hanging wall (the left side in the figure). Due to the anti-compression spring 21 whose seating surface is the wall,
A pair of support shafts 20a and 2 support the tool holders Fa and Fb, which are always repelled to the right side of the figure, that is, toward the housing 47 side, so as to be slidable in the respective moving directions.
0b is installed in parallel between the left and right hanging walls, and a guide hole 22 receives a rod 23 that presses each tool holder against the springs 21, which will be described later.
a, 22b are bored in the anti-spring housing of the member 6'. The tool holders Fa, Eb have stop buttons 24, 24 facing the pressing rods 23, 23, and the stepped outer circumference of the cutter C provided at the bottom is rotatably suspended around the spline hole 25. It has a bearing part.

In FIGS. 2 and 4, the main body 2 is inserted and deployed horizontally in the left-right direction (the support shaft 20
One end (left end) of the long axis 26 (perpendicular to the cylinders 20a and 20b) has a small diameter end that protrudes outside the main body via a stop plate 27 whose outer diameter is enlarged.
The cylinder 28 is connected to a sliding shaft 29 having a locating pin 30 at its tip and a movable part 32.
They are integrally fixed to the movable plate 33 in parallel with the sliding shafts 31 having opposite directions, respectively. The other end of the long shaft 26 (the right end protruding outside the main body) is connected to a movable plate 34 by a nut 35.
is fixed. A sliding shaft 36 having a locate pin 37 at its tip inserted into the main body 2 is fixed to the movable plate 34 parallel to the long axis 26, and each locate pin 30, 37 and movable parts 32, 3
8 is facing. Locate pins 30 and 37
One of the locating pins 30 is used to select and use one of the many mounting holes radially drilled in the flange portion of the workpiece Wa, and the other locating pin 37 is used to locate the workpiece Wb. It is installed to correspond to hole Xb (see Figures 3 and 4). Further, a movable pad 38 is attached to the center right side of the long shaft 26, and this movable pad 38 and the above-mentioned movable pad 32
Both are the flange machining surface FL of workpieces Wa and Wb.
is installed opposite.

Furthermore, as shown in FIG. 4, the movable pad 3
Similarly to 2 and 38, the flange processing surface FL of each workpiece
Fixing pads 40a and 40b are fixed to inner two of the four vertical members 18, facing each other. From the state shown in Fig. 4A, the cylinder 28
When the is extended, the movable plate 34 and the sliding shaft 3
6 begin to move together to the right in the figure via the long axis 26, and stop when the stop plate 27 comes into contact with the wall 2' of the main body 2. Then, when the cylinder 28 further extends, the cylinder 28, the movable plate 33, and the sliding shafts 29 and 31 each begin to move to the left in the figure as one unit, and when the cylinder 28 extends its full stroke, each part stops in the state shown in Figure 4B. At this time, movable pad 3
The fixing pads 2 and 38 stop at a distance forward from the front end surfaces of the fixing pads 40a and 40b by a distance, respectively.
This dimension is set to correspond to the amount of offset between the above-mentioned window center line and the spherical surface center line.

In FIGS. 3 and 6, regarding the configuration of the transfer drive member for the spherical tool, the machining head 41 shown in imaginary lines is placed on the saddle of a slide unit (not shown), and is located at the back of the machining device in FIG. A drive shaft D that provides rotational motion and cutting feed to the cutter C is attached to the lower spindle 42, which is disposed at a position perpendicular to the long axis 26, in parallel with the support shafts 20a and 20b (the sliding direction of the tool holder). . That is, this drive shaft D has a shaft part that fits loosely into the pinion shaft hole B' of the workpiece, and a spline shaft part that fits smoothly into the spline hole 25 of the cutter C, and starts starting when the spline connection is completed. The cutter C is rotated by the rotating spindle 42, and the back surface of the cutter is pressed by the stepped shoulder D' to provide cutting feed. At this time, the drive shaft D is connected to the front and rear brackets 43 provided on the main body.
Both ends thereof are supported by guide bushes 45 and 46 respectively provided on 44. The spindle 4
A press rod 23 is attached to the housing 47 located at the upper stage of the cutter 2 in the same direction as the axis of the spindle 42, and the stepped shoulder D' of the drive shaft D comes into contact with the back surface of the cutter. Since the cutter C is set to contact the stop button 24 in synchronization with the pressing rod 2, the cutter C is actually
3 and the drive shaft D, the cutting feed is applied against the anti-compression spring 21. When the head 41 is at the original position, that is, at the backward end position, the tool holders Fa, Fb and the cutter C are stopped at the positions indicated by the two-dot chain lines in FIGS.

``Function'' Now, with the completion of machining, each device is in its original position, that is, the head 41 is stopped at the backward end position by the slide unit, and the lifting members such as the tool and clamper 9 are moved by the retracting movement of the cylinder 5. As shown in the chain line in FIG. 2, the cylinder 28 is stopped at the rising end position and the cylinder 28 is extended, and the lateral moving members such as the locate pins 30 and 37 and the movable pads 32 and 38 are moved to the fourth position.
When the machine stops in the state shown in the figure, first, the machined workpiece Wb is unloaded manually or automatically, and then the single-sided machined workpiece Wa is transferred to the Wb position while being reversed by 180 degrees. Load the workpiece to Wa position.
When loading single-sided machined workpieces and semi-finished workpieces, move the flange machined surface FL to the movable pad 3.
2, 38, that is, the pads 32, 3
8 as a guide surface during loading, the hub portion H is inserted into V-shaped grooves 19a, 19a' and 19.
b, 19b'. Therefore, the loaded workpiece is automatically loaded at a position shifted by the dimension from the fixed pads 40a and 40b, in other words, with the workpiece window center aligned with the cutter center as shown in FIG. 1A. .
As the loading of the workpiece is completed, the cylinder 5 begins to extend, and when a detection member (not shown) detects the lowered position where the lower end of the movable block 6 comes into contact with the stopper 39 on the main body 2 side, the supply of hydraulic pressure to the cylinder 5 is temporarily cut off. be done. Therefore, the clamper 9 is slightly lifted up via the connecting shaft 7 due to the accumulated force of the spring 8. The amount of lift up is shown in Figures 2 and 8.
As shown in Figure A, this is represented by the gap Δm generated between the spring seat surface 50 of the horizontal member 6' and the step 7d of the connecting shaft 7, and is actually very small at 1 to 3 mm.
``In addition, the gap △m is set at the 8
As shown in Figure B, the gap decreases to △m', and the gap △ between the lower end surface of the member 6'' and the upper end surface 11a of the member 11.
yields n′. ”. Therefore, although the cutter C descends to a predetermined height in the pocket of each workpiece and stops, the push pieces 17a, 17a' and 17b, 17b' of the clamper 9 close the gap between them and the hub portion H of the workpiece. x (see Fig. 8A), there is no direct contact, and no restraint is given to the workpiece. When the cylinder 28 starts to retract in this state, the sliding shafts 9 and 36, which have locating pins 30 and 37 at their tips, move inwardly toward each other via the movable plates 33 and 34, and the locating pins 30 and 37
After completely fitting into the positioning holes Xa and Xb of each workpiece, the workpieces Wa and Wb also move to the sliding shafts 29 and 36.
move as one. When the flange processed surface FL of each workpiece comes into contact with the fixing pads 40a, 40b, the retraction movement of the cylinder 28 is stopped.
As a result, the workpieces Wa and Wb have been moved by the amount of offset relative to each other, and the positional relationship between each workpiece and the cutter C is now as shown in FIG. 1B. Next, by supplying hydraulic pressure to the cylinder 5 again, the clamper 9 resists the spring 8.
By pressing down by △n'=x, each pressing piece 17a, 1
7a', 17b, and 17b' press from the upper surface of the hub H to firmly clamp the workpiece. Since the frames 16a and 16b of the clamper 9 are swingably supported by the pin 14, there is an advantage that uniform clamping pressure can be obtained even if there is an error in the hub machining of the workpiece.

When the positioning and clamping of the tool with respect to the workpiece is completed in this way, a slide unit (not shown) moves forward. When the drive shaft D and the cutter C are spline-coupled by the forward movement of the slide unit, the spindle 42 is driven and the cutter C is rotated. On the other hand, the tool holders Fa, Fb and the cutter C are advanced by a predetermined amount by the pressing rod 23 and the drive shaft D against the anti-contraction spring 21 to simultaneously machine the spherical seats of the workpieces Wa and Wb. One cycle of the machine's operation is completed by operating each device in the opposite manner as described above based on the machining completion command and returning everything to its original position.

Incidentally, it goes without saying that the present invention is not limited to the embodiments described above.

``Effects'' As described above, according to the present invention, when machining a spherical seat on a two-cavity workpiece, the tooling and clamper are moved up and down by a single cylinder, and the positioning and offset operations are performed by another single cylinder. As a result of the related operation, the number of attitutors is significantly smaller than before, making the entire device smaller and more compact, which is not only economically advantageous, but also provides a highly reliable device with fewer breakdowns and other malfunctions. There is an effect that can be done.

[Brief explanation of drawings]

Fig. 1A is a half-sectional view showing the relationship between the workpiece and the cutter, Fig. 1B and C are its front views, Fig. 2 is a front view of an embodiment of the present invention, and Fig. 3 is the same as Fig. 2. Line sectional view, Figure 4 A is a vertical sectional view of the sliding shaft portion, Figure 4
Figure B is a longitudinal cross-sectional view of the clamper in its operating state, Figure 5 is a perspective view of the clamper, Figure 6 is a cross-sectional view of the tool holder, Figure 7 is a cross-sectional view taken along the - line in Figure 6, and Figures 8 A and B are cross-sectional views of the tool holder. 1 is a cross-sectional view showing the relationship between a connecting shaft, a movable block, and a clamper, and an operational cross-sectional view. 2... Main body, 3... Support, 4... Plate, 5
...Cylinder, 6...Movable block, 6'...Horizontal member, 7...Connection shaft, 9...Clamper, 11...
...Fixing block, 11'...Through hole, 8, 21...
...Spring, 13...Parallel plate, 16a,
16b...Frame body, 20a, 20b...Support shaft, 2
4...stop button, 39...stopper, 17
a, 17b'...pressing piece, 18...vertical member, 25...
...Spline hole, 23...Press rod, 19a,
19b'... V-shaped groove, 27... Stop plate,
41... Processing head, 43, 44... Bracket, 45, 46... Guide bush, Wa, Wb...
...Workpiece, H...Hub part, D...Drive shaft,
D'...Stepped shoulder, 29, 31, 36...Sliding shaft, 26...Long shaft, 28...Cylinder, 30,3
7... Locate pin, 38, 32... Movable pad, 40a, 40b... Fixed pad, C... Spherical tool (cutter), F... Tool holder, △m...
…gap.

Claims (1)

[Scope of utility model registration request] A horizontal member 6' passing through the center connects an elevating cylinder 5 attached to a plate 4 that spans between the upper edges of each support column 3 suspended above the main body 2, and a movable block 6 that fits into each support column 3 so as to be able to rise and fall freely. A connecting shaft 7 is loosely inserted into the hole 11' and connected to the lifting cylinder 5. A fixing block 11 is firmly fitted to the lower end of the connecting shaft 7, and a parallel plate 13 is pivotally supported at both ends of the connecting shaft 7. When the lifting cylinder 5 is clamping the workpieces Wa, Wb after being offset by the clamper 9, the movable block 6 has the stopper 39 on the main body as its lower end, and the connecting shaft 7
A slight gap (Δm) is provided in the vertical direction between the movable block 6 and the movable block 6 via a spring 8 that applies a downward elastic force, and each support shaft is mounted horizontally between both hanging walls of the horizontal member 6'. Tool holders Fa and Fb are slidable on the support shafts 20a and 20b and are pushed by an anti-compression spring 21 toward the head 41 side facing the support shafts 20a and 20b to rotatably suspend the spherical tool C.
and each vertical member 1 in the main body.
V-shaped grooves 19a, 19b for supporting the workpiece provided at 8, fixing pads 40a, 40b, and a long shaft 26 extending through the main body in the lateral direction; It is fixed to the plates 33, 34 and the other end is attached to the locate pins 30, 3.
7, each sliding shaft 29, 36, drive cylinder 28
and a lateral movement member for work offset that rests on the V-shaped grooves 19a and 19b consisting of movable pads 32 and 38 provided on the long shaft 26 and the sliding shaft 31, and a bracket 43 protruding from above the main body 2, 44 is provided with a guide bush 46 that matches the spline hole 25 provided at the axis of the spherical tool C at the lowered position of the movable block 6 which is stopped by the stopper 39. The drive shaft D of the forward machining head 41 to be inserted, the stepped shoulder D' of the drive shaft D to push the spherical tool C to the machining position, and the tool holders Fa and Fb to be moved in synchronization with the pushing of the spherical tool C. A processing head 41 that is pushed by a predetermined amount against an anti-compression spring 21.
A spherical seat machining device comprising a transfer drive member for a spherical tool C consisting of an upper pressing rod 23.