JPH03184745A - Index machining jig - Google Patents

Abstract

PURPOSE:To index a rotary table so accurately with a fine pitch and thereby make the clamping of a large-sized work and even heavy metalcutting possible by providing a work clamping table free of rotation and lockable to a machine frame with a positioning engagement pair and an operating head free of rotation and shiftable toward a turning shaft respectively. CONSTITUTION:When an operating head 25 is moved in the axial direction by the execution of an indexing command, the clamping of a clamping table 3 is released, and this clamping table 3 rotates as far as an angle proportionate to a turning angle at time of rotation of the head 25. When hands 42, 43 are separated from the head 25 or when axial energizing force of the head 25 by these hands 42, 43 at the forward stage is released, a positioning engagement pair 12 is engaged with it, clamping the rotary table 3. In this connection, the rotary table 3 is rotatable at an optional angle proportionate to the turning angle of the head 25, and when a face gear joint or the like is used as the engagement pair 12, an indexing pitch can be subdivided and rigidity of the rotary table is enlargeable as well. In addition, when rotation of the head 25 is reduced and the rotary table 3 is rotated the other way, turning effort in the rotary table 3 is easy to make it yet large too, thus manufacturing of a large- sized jig is facilitated.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a jig used when machining a casing of a mechanical device using a machining center or a milling machine. This invention relates to a jig that can be rotated and indexed using an NC device (hereinafter referred to as a "rotary table" for distinction).

(Prior art) When processing a workpiece 55 having a shape as shown in FIG.
If you use a horizontal machining center with a rotary table, you can machine side A or side 0 in just one installation, but if you try to machine side 0 or side F without changing setups, you will need to use a horizontal machining center that has an indexable rotary table. Therefore, it becomes necessary to use a jig.

A jig with an indexable rotary table requires an operation to index the rotary table. If a worker has to manually perform the indexing, unmanned processing is not possible. So N
C! A jig that performs indexing using an electric servo or hydraulic servo by an IJ control device, and an operating rod that rotates the rotating table via a rack and pinion mechanism, etc. are provided, and each operation of the operating rod rotates the rotating table by a predetermined angle. A jig or the like that rotates and whose operating rod is operated by a spindle head of a machine tool, etc., is in practical use.

(Problem to be solved by the invention) However, with a jig that indexes the rotary table using an electric servo or a hydraulic servo, a power cable or hydraulic pipe and a signal line must be connected to the jig to rotate the table of a machine tool. A problem arises in that the feed is restricted by the connections of these cables and the like. There is also a method of continuously unmanned machining of a large number of workpieces by loading the workpieces onto pallets and automating the loading and unloading of the pallets. It is necessary to automate the connection and disconnection of power cables, etc. to the device, which makes the device very complicated.

On the other hand, the method of rotating the rotary table by moving the operating rod of the jig by the movement of the table or spindle head of the machine tool is 1.
Since the angle to be indexed is determined by each operation of the operating rod, detailed indexing cannot be performed, and if the indexing angle is finely determined in one operation, it will take a lot of time, for example, when reversing the workpiece. This problem arises. In addition, such jigs are limited to relatively small ones,
There is a drawback that it cannot be used for machining large workpieces.

This invention was made with the aim of solving the above problems. It can be controlled by the NC device of the machine tool without connecting a power cable or hydraulic pipe, and the rotary table can be accurately controlled with a small pinch. The objective is to provide a machining jig with a structure that can be used for indexing, fixing large workpieces, and performing heavy cutting.

(Means for Solving the Problems) The processing jig of the present invention includes a rotatable workpiece fixing table 3 and an operation hand 25 that is rotatable and movable in the direction of the rotation axis. The fixed base 3 is connected to the operating head 25 via a rotation transmission mechanism such as a worm gear 6.23 or a toothed belt 60.
The shaft 24 is connected to the shaft 24, and can be fixed to the machine frame 2 by a positioning engagement pair such as a face gear joint 12. The operating head 25 has a spring 2 that maintains its axial position at a steady position.
It is equipped with a biasing means such as No.6. The positioning engagement pair 12 for fixing the fixing base 3 is engaged when the operating head 25 is in the normal position, and is connected to a mechanical coupling means 33 such as a link.
35 to the operating head 25 via hydraulic coupling means 67, 68, and the disengagement operation of the positioning engagement pair 12 is performed in conjunction with the axial movement of the operating head 25.

If the rotation table 3 only needs to be indexed around one axis, the machine frame 2 of the jig may be integrated with the machine frame 1.

If you want the rotary table 3 to index around two axes,
The machine frame 2 is supported rotatably around a second shaft 71, and the machine frame 2
A mechanism similar to the above mechanism provided between the rotary table 3 and the machine frame 2 can be provided between the rotating table 3 and the machine frame 2.

(Function) Hands 42 and 43 that engage with the operating head 25 of the jig are placed in the tool magazine of the machine tool that processes the workpiece. The indexing command that is incorporated into the NC device program is the hand 42.4
3, command to attach hands 42 and 43 to operating head 25
command to engage the operating head 25 with the hands 42 and 43.
, a command to move the hand 42 . 43 to the tool magazine. These commands are executed by a combination of relative linear and circular movements of the main axis of the machine tool and the table.

When the above indexing command is executed, when the operation head 25 is moved in the axial direction, the fixation of the fixed base 3 is released, and when the operation head 25 rotates, the fixed base 3 is fixed in proportion to the rotation angle. Rotate by the angle you want. Then, when the hands 42.43 are detached from the operation head 25, or when the axial biasing force of the hands 42.43 on the operation head 25 is released, the positioning engagement pair 1
2 engages to fix the rotary table 3.

The rotary table 3 can be rotated to any angle proportional to the rotation angle of the operating head 25, and by using a face gear joint or the like as the positioning engagement pair 12, it is possible to make the indexing pitch finer. , and the rigidity of the rotary table 3 can be increased. In addition, if the rotation of the rotor 25 is decelerated by a worm gear or the like to rotate the rotary table 3,
It is also easy to increase the rotational force of the rotary table 3, and it is also easy to manufacture a large-sized jig.

(Embodiment) FIGS. 1 to 3 show a first embodiment of the present invention. In the figure, 2 is a machine frame of the jig, and 3 is a rotary table whose outer peripheral portion is rotatably held by a bearing 4. In this embodiment, rotary tables that can be independently indexed are provided on both sides of the machine frame 2. There is. 5 is a ring fixed to the back surface of the rotary table 3, and 6 is a worm wheel integrated with the ring 5. 7 is a support bracket integrated with the machine frame 2; 8 is a sleeve slidably supported on the support bracket 7 and unrotatably supported by a sliding key 9; 10;
1) is a flange portion at the tip of the sleeve, and 1) is a grooved disk integrally fixed to the rear end of the sleeve 8.

A face gear joint 12 is interposed between the flange portion 10 of the sleeve and the ring 5, and when the sleeve 8 slides in the axial direction, the joint 12 is fitted and removed, and when the joint 12 is fitted, The rotary table 3 has a face gear joint 12 and a sliding key 9
It is fixed to the support bracket 7 via the support bracket 7, and the rotation of the rotary table 3 is restricted. Therefore, the unit indexing angle of the rotary table 3 is
It is determined by the tooth pitch of the face gear joint 12.

15 is a shift lever whose base end is pivoted to the machine frame 2 with a pin 16.
17 and 18 are spring plates fixed to the tip of the shift lever 15. The first spring plate 17 extends on an extension of the shift lever 15, and a recess 19 is formed between the second spring plate 18 and the first spring plate 17. and shift lever
The bifurcated portion 20 at the center of the flange 15 fits into the circumferential groove of the flanged disk 1).

23 is a worm that meshes with the worm wheel 6; 24 is its shaft; both ends of the shaft 24 are pivotally supported by the machine frame 2, and an operating head 2 is attached to one end of the worm so as to be slidable in the axial direction but not relatively rotatable.
5 is installed. The operating head 25 is urged in the protruding direction by a spring 26 and is in contact with a stopper (not shown) provided on the worm shaft 24 . The operating head 25 integrally includes a handle bin 27 and a grooved disc 28,
The handle bin 27 includes an intermediate collar 29 and a tip projection 30.

33 is a first connecting arm pivotally supported on the machine frame 2 by a bin 34; 35;
is a second connecting arm pivotally supported on the machine frame 2 by a pin 36; a roller 37 is pivotally attached to the tip of the second connecting arm 35, and the roller is in contact with the first spring plate 17; First connecting arm 3
3 fits into the fork 38 formed at the base end of the second connecting arm 35, and the fork 39 formed at the base end of the first connecting arm 33 fits into the circumferential groove of the grooved disk 28 of the operating head. They are mated.

Hands 42 and 43 shown in FIG. 3 are equipped with a center rod 45 having a small hole 44 at its tip and L-shaped fingers 46 and 46 facing each other so as to sandwich the center rod 45. Reference numeral 47 denotes a taber shank of standard dimensions, and hands 42 and 43 are stored in a tool magazine of a machine tool, and are loaded onto and removed from the tool shaft of the machine tool by an automatic tool changer according to a command from an NC device.

FIG. 3 shows the jig of the first embodiment mounted on a rotary table of a machining center. The installation surface H of is fixed to the table 50. The workpiece 55 is fixed to the rotating table 3 of the jig. Under normal conditions, the rotary table 3 cannot rotate due to the meshing of the face gear joint 12. In the case of a horizontal machining center, by rotating the table 50, the A side, B side, and 0 side of the workpiece 55 can be machined while the rotating table 3 is fixed. When machining surfaces D, E, and F, the hand 42 (hand 43 in the case of vertical type) is loaded on the tool shaft, and the hand 42 is moved relatively by horizontally moving the table 50 and raising and lowering the tool shaft. insert the intermediate collar 29 of the handle bin 27 into the finger 46 from the side, and then move the table 50 back and forth to insert the hand 4.
2 are relatively advanced to fit the tip projection 30 of the handle bin into the small hole 44 of the hand 42, and the hand 42 is further advanced to push the operating head 25. By this operation, the second connecting arm 35 rotates via the first connecting arm 33, and the roller 37 at the tip of the second connecting arm moves into the recess between the first spring plate F and the second spring plate 18. Enter location 19 and shift lever -1
5 is swung toward the rotary table 3, the sleeve 8 slides toward the rotary table 3, the surface gear joint I2 is disengaged, and the rotary table 3 becomes rotatable. In this state, the table 50 is
The hand 42 is caused to move in a circular motion by the left and right movement of the tool and the tool axis is raised and lowered, the operating head 25 is rotated, and the rotary table 3 is rotated via the worm 23 and the worm wheel 6. The rotation angle of the rotating table 3 is determined by the number of circular movements or the angle of the operating head 25, so an NC program is created to make the circular movement by a desired angle, and once the table 50 is rotated by a predetermined angle, the table 50 is rotated. After retracting, the handle 42 is moved laterally to separate from the operating head 25. Then, the operating head 25 is returned to the protruding direction by the spring 26, and the roller 37 of the second operating arm 35 presses the first spring plate 17 to move the shift lever 15, and therefore the sleeve 8, to the opposite side of the rotating metal. The rotation table 3 is engaged with the face gear joint 12.
to be fixed.

Through the above-described operations, the rotary table 3 can be indexed and fixed at a desired angle, and all surfaces A to F of the workpiece 55 can be processed without replacing the jig or the workpiece 55.

In the first embodiment described above, two rotary tables 3 are provided, but it goes without saying that only one rotary table 3 may be provided as shown in FIG. The second embodiment shown in FIG.
is L-shaped, and can be used as a rotation table around a vertical axis by installing the installation surface H side on the table 50, and as a rotation table around the horizontal axis by installing the installation surface V side on the table 50. It is something.

6 and 7 show a third embodiment of the present invention, in which the rotation of the operating head 25 is transmitted to the rotating table 3 using a toothed belt 60, and the operating head is 25 is converted into a fitting/disengaging movement of the face gear joint 12. In this third embodiment, a piston 61 is integrally formed in the sleeve 8, and the piston is fitted into a cylinder 62 formed in the support bracket 7. The shaft 24 of the operating head 25 is connected to the sleeve 8
A toothed pulley 63 and a toothed pulley 64 fixed to the ring 5 on the back side of the rotary table 3 are provided in parallel with the rotary table 3 and fixed to the shaft.
A toothed belt 60 is wound between the two. The operating head 25 is biased in the projecting direction by a spring 26, and has a grooved disk 28 as in FIG. The fork 3 at the base end of the connecting arm 33 is pivotally supported on the machine frame 2 by a pin 34.
9 is fitted into the circumferential groove of the grooved disc 28, and its tip is pivotally connected to one rod 66 of a double rod cylinder 65 which is swingably supported on the machine frame 2. Double rod cylinder 6
5 and the cylinder 62 of the support bracket are the piping 67.68
The cylinders 62, 65 and piping 67, 68 are sealed with hydraulic oil.

In the above configuration, the hand attached to the tool axis is moved to the operating head 2 by the cooperative movement of the table and the tool axis described above.
5 and push it in, both rod cylinders 6
5 flows into the cylinder 62 of the support bracket and slides the sleeve 8 toward the rotary table 3, disengaging the face gear joint 12 and making the rotary table 3 freely rotating. Therefore, if the hand is caused to make a circular motion, the rotation of the operating head 25 is transmitted to the rotary table 3 via the toothed bell 60. When the hand is removed from the operating head 25 after rotating the rotary table 3 by a desired angle, the operating head 25 returns to the protruding direction due to the biasing force of the spring 26, and the plane gear joint 12 moves to the rotary table 3.
and the sleeve 8 due to the biasing force of a spring 69 interposed between the cylinder 62 of the support bracket and the both rod cylinders 65. also returns to its original position.

FIG. 8 and FIG. 9 are diagrams showing a fourth embodiment of the present invention. In this fourth embodiment, the machine frame 2, which rotatably and fixably supports the rotary table 3 with the above-mentioned structure, is rotatably supported by a shaft 71 in a direction perpendicular to the rotation axis of the rotary table 3, and this machine frame 2 and the rotary table 3 are determined by the machine tool's N.
This can be carried out using the C device.

Although the figure does not show a mechanism for rotating the rotary table 3, a structure similar to that of the first or third embodiment may be adopted. The following are members for rotating and fixing the machine frame 2, 72 is a face gear joint for fixing the machine frame, 73 is a worm wheel, 75 is an operating head, and 76 is vertically slidable and rotatable. 77 is a worm that is slidably but not relatively rotatably mounted on the operating shaft 76 and meshes with the worm wheel 73; 78 is a first connecting lever that is pivotally supported on the machine base 1 by a shaft 79; Reference numeral 80 indicates a second coupling lever that is substantially the same body as the first coupling lever 78. Reference numeral 81 indicates a cam lever pivotally supported at the lower end of the second coupling lever 80. Reference numeral 82 indicates a cam lever mounted on the operating shaft 76 so as to be relatively rotatable and non-slidable. A cam link engages with the cam lever 81, 83 is a biasing spring, and 84 is a return spring.

The hand for operating the operation head 75 may be of the structure shown at 42 in FIG. 3 in the case of a vertical machining center, but if it is a horizontal machining center, it may be of the structure shown at 43 in FIG. 45 and finger 46 to L
A shape is used.

In the above configuration, when the operating head 75 is moved downward and then rotated, the cam link 82 is disengaged from the cam lever 81, the coupling lever 78 is swung by the return spring 84, the meshing of the face gear joint 72 is released, and the operating head The rotation of 75 rotates the machine frame 2 via the worm 77. When the hand is pulled up, the tip of the finger 46 is caught on the intermediate flange 29 and the rad 75 is pulled up for operation, the cam link 82 moves up and the cam lever 81 is swung, and the force of the biasing spring 83 causes the return spring 84 to push. It is compressed, and the plane gear joint 72 engages, thereby fixing the rotation of the machine frame 2. The structure of this fourth embodiment is suitable as a jig for use in machining centers, drilling machines, milling machines, etc. equipped with a vertical tool axis, and can be used as a jig as shown in FIG. 4 without rotating the table of the machine tool. All surfaces A to F of the workpiece 55 can be processed.

(Effects of the Invention) According to the invention described above, in a jig in which rotation and indexing of the rotary table can be performed by an NC device controlling a machine tool, the rotary table can be accurately indexed at fine pitches. This has the effect of providing a machining jig with a structure that allows for the fixation of large workpieces and heavy cutting.

[Brief explanation of drawings]

1 to 3 are diagrams showing a first embodiment of the present invention, in which FIG. 1 is a perspective view showing a mechanical part, FIG. 2 is a plan view partially sectional, and FIG. 3 is a machine tool. FIG. 2 is an overall perspective view showing the device installed on a table. FIG. 4 is a perspective view showing an example of a workpiece. FIG. 5 is an overall perspective view showing a second embodiment of the invention. FIGS. 6 and 7 are views showing the third embodiment, in which FIG. 6 is a partially sectional plan view, and FIG. 7 is a side view of the main parts. FIGS. 8 and 9 are views showing the fourth embodiment, with FIG. 8 being a partially cutaway front view and FIG. 9 being a side view showing the mechanism. In the figure, 2: Machine frame 6: Worm wheel 1): Grooved disc 3: Turntable 8 Sleeve 12: Face gear joint 15: Shift lever 24: Shaft 26: Spring 28: Grooved disc 42.437 Hand 60 :Toothed belt 62 Niji cylinder 67.68: Piping 73: Worm wheel 77: Worm 81: Cam lever 23: Worm 25: Operation head 27: Handle pin 33.35: Connecting arm 55: Work 61: Piston 65: Double rod cylinder 72: Face gear joint 75: Operation head 7B, 80: Connection lever 82: Cam link

Claims (2)

[Claims] (1) Rotatable and positioning engagement pair (12) with machine frame (2
), and an operation head (25) that is rotatable and movable in the direction of the rotation axis. )
The positioning engagement pair (12), which is rotatably connected to the operating head (25) via and in steady state engagement, is connected to the mechanical coupling means (33, 35) or the hydraulic coupling means (67,
68), characterized in that it is operatively connected to the axial movement of the operating head (25) via the indexing tool. (2) The processing jig according to claim 1, wherein a rotating table (3) rotatable around an axis parallel to the installation surface (H) of the machine frame (2) is provided on both sides of the machine frame (2). .