JPH06270029A - Dividing device - Google Patents

Abstract

PURPOSE:To improve workability and make the necessary working space compact by securing the release space for a tool over a body case, as for a dividing device. CONSTITUTION:A dividing device is equipped with a body case 1 which supports a dividing shaft 3 and a rotary table 5 which is fixed at the top edge part of the dividing shaft 3 and holds a work holding jig in a demountable manner. The rotary table 5 is formed to a cross shape by four arm parts 6 extending in all directions from the axis center, and the outer peripheral shape of the body case 1 in the range on the body case top wall side in comparison with the axis center of the dividing shaft 3 is formed to the shape free from the outward projection from the outer peripheral shape of the rotary table 5 at a prescribed dividing position, and a release space for a tool is secured over the body case 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indexing device for detachably holding a workpiece to be cut or ground through a jig and performing indexing. Attach the four-sided vise V as shown in 1
The present invention relates to an indexing device suitable for a process, that is, for simultaneously cutting or grinding each upward surface of three workpieces W on the upper side and the left and right sides at one indexing position.

[0002]

2. Description of the Related Art A conventional indexing device is provided with a disk-shaped rotary table 100 as shown in FIG. 8, and a main body case 101 for supporting the rotary table 100 is formed in a rectangular shape or the like and has an axial direction. As seen in FIG. 1, the outer circumference of the rotary table 100 extends radially outward over substantially the entire circumference.

A four-sided vise V is used in such an indexing device.
In the case of mounting and carrying out a plane cutting process using the plane milling cutter T as shown in FIG. 9, the rotary table 100 and the main body case 101 project outward from each work W when viewed in the axial direction. Therefore, it is necessary to secure a clearance space for the tool on the indexing device side in the axial direction so that the tool does not collide with these during cutting work. In order to secure such a clearance space for the tool, conventionally, as shown in FIG. 8, a cross-shaped thick spacer 103 or the like is interposed between the rotary table 100 and the vise V.

[0004]

However, when the spacer 103 is interposed as shown in FIG. 8, the number of parts is increased and the vise replacement work is troublesome. Furthermore, the protruding length of the vise V with the rotary table 100 as a fulcrum becomes long and the weight also increases, so that the amount of deflection of the vise during the work becomes large, leading to a reduction in cutting accuracy or grinding accuracy.

Even if the front end of the vise V is rotatably supported by the tailstock, it is unavoidable that the span between the rotary table 100 and the tailstock becomes long, and a long installation space is required in the axial direction. become.

Moreover, the rotary table 100 of the indexing device.
Since the main body case 101 still projects to the outside of the work W, the tool T is passed through the escape space due to carelessness, erroneous operation, incorrect input value in NC control, or the like. It may happen that the tool T is moved to collide with the indexing device.

An object of the present invention is to perform simultaneous cutting or grinding of a plurality of works using an indexing device,
By ensuring a sufficient escape space for the tool above the main body case, avoiding collision between the tool and indexing device due to erroneous operation, etc., the installation space for the jig and indexing device is compact in the axial direction. It is to transform.

[0008]

The present invention comprises a main body case for supporting an indexing shaft, and a rotary table fixedly attached to the tip end of the indexing shaft and having a work holding jig removably mounted thereon. , The rotary table is formed in a cross shape by four arm portions extending in four directions from the axis, and the outer peripheral shape of the main body case in the range closer to the top wall side of the main body case than the axis of the indexing shaft is changed in the axial direction. As seen, it has a shape that does not project outward from the outer peripheral shape of the rotary table at the predetermined indexing position.

Further, in order to facilitate the mounting work of the jig and the machining of the main body case, in the second aspect of the invention, in the range closer to the top wall of the main body case than the axis of the indexing shaft. When the outer peripheral shape of the main body case is viewed in the axial direction, the stepped shape that follows the outer peripheral shape of the rotary table is removed, except for the portion corresponding to the bolt insertion hole for the jig mounting of the arm that is in the posture of protruding to the top wall side. I have to.

[0010]

[Function] A cross-shaped jig such as a four-sided vise is mounted on the cross-shaped rotary table of the indexing device so as to be coaxial with each other and the crosses corresponding to each other. Workpieces are mounted on the four surfaces around the axis of the jig.

In one step, the upwardly facing top surface of the work located on the upper side and the upwardly facing side surfaces of the work located on both the left and right sides are simultaneously machined.

In the above work, when the tool moves in the axial direction relative to the work and the indexing device, even if the tool moves too much to the indexing device side, it will pass through the upper side of the main body case. , It does not collide with the body case.

[0013]

1 is a perspective view of an indexing device to which the present invention is applied. In FIG. 1, a main body case 1 is integrally provided with a mounting base 2 at a lower end thereof, and the base 2 is a bolt assembly. It has a combined recess 11 and the like, and is fixed to the movable table 10 and the like of the machine tool by bolts.

An indexing shaft 3 parallel to the lower end mounting surface of the base 2 is supported in the main body case 1, and the indexing shaft 3 is provided.
The rotary table 5 is fixed to the front end portion of the axial direction.

The rotary table 5 has four radial arrangements.
It is formed in a cross shape as a whole by one rectangular arm portion 6, and has a symmetrical shape vertically and horizontally. Each arm 6
A pair of jig insertion bolt insertion holes 8 are formed at the respective radially outer end portions of the, and the core of the indexing shaft 3 is provided on the back surface (rear surface) of each arm portion 6. An engaging groove 12 for positioning that extends radially outward from is formed.

FIG. 2 shows a state in which a four-sided vise V is mounted on the rotary table 5 as a jig. Four-sided vise V
Has a work mounting seat 15 having a total of four surfaces at an interval of 90 ° around the axis when viewed in the axial direction, and has a cross-shaped flange portion 1 having substantially the same shape as the rotary table 5 at the rear end portion in the axial direction.
6 is integrated.

A dovetail groove 18 is formed in each work mounting seat 15 in the axial direction, and a fixed block 20, a V-shaped block (wedge) 21 and a presser cap 22 are arranged in this order from the front side. The surfaces of the fixed block 20 and the base 22 which face each other are inclined surfaces corresponding to the V-shaped surface of the V-shaped block 21.

The fixing block 20 is fixed to the mounting seat 15 by a bolt 25 and a nut arranged in the dovetail groove 18 so that the axial position thereof can be adjusted, and the mouthpiece 22 engages with the dovetail groove 18 (not shown). The engaging portion is engaged so as to be axially movable but unable to slip out. The V-shaped block 21 is pulled toward the mounting seat 15 side by the bolt 26 and the nut arranged in the dovetail groove 18, and the wedge action pushes the mouthpiece 22 rearward so that the mouthpiece 2
The work W is sandwiched between the two and the cross-shaped flange portion 16. In this way, the four-sided vise V
The work W can be fixed to the four surfaces around the axis at 90 ° intervals.

The outer peripheral shape of the main body case 1 which is a main part of the present invention will be described. 4 and 5, the outer peripheral shape of the main body case 1 in the range above the axis of the indexing shaft 3 has a head portion 30 formed in the central portion of the left and right width, and left and right sides of the head portion 30. Left and right shoulders 31 formed in the lower position of the
Are formed in a stepped manner.

The height H2 of the top surface of the head portion 30 is lower than the height H1 of the upper end of the arm portion 6 in the upward posture so that the entire bolt insertion hole 8 can be exposed to the minimum. The width W1 of the head portion 30 in the left-right direction is formed to be substantially the same as the width of the arm portion 6 in the circumferential direction. The height H3 of the upper end surfaces of the left and right shoulder portions 31 is substantially equal to the height of the upper side surface of the arm portion 6 facing in the left-right direction, and the width W of the both shoulder portions 31 in the left-right direction is formed.
3 is substantially the same as the width between the end faces of the arm portions 6 facing in the left-right direction.

That is, in the range above the axis of the indexing shaft 3, the shape of the outer peripheral surface of the main body case 1 is formed so as to conform to the outer peripheral shape of the cross-shaped rotary table 5 except for the top surface of the head portion 30. Therefore, it does not project above and to the left and right of the cross-shaped rotary table 5.

This indexing device is provided with a drive mechanism utilizing air pressure. 6, a case lid 35 is fixed to the rear surface of the main body case 1 via a piping manifold 34 having an air circuit, and the indexing shaft 3 is attached to the main body case 1 and the case lid 35 via a bearing 36. Is supported by. A fan-shaped cylinder 38 for rotating the indexing shaft 3 at 90 ° intervals is formed in the rear portion of the main body case 1.

In FIG. 5 showing the VV cross section of FIG. 3, a fan-shaped piston 39 is fitted in the fan-shaped cylinder 38 so as to move within a range of 90 ° around the axis. An inner peripheral end portion of 39 is fixed to a ring 46 rotatably fitted to the indexing shaft 3. Fan-shaped piston 39
Each of the air chambers 38a, 38b partitioned by is connected to an air circuit in the piping manifold 34 of FIG. 6, and is switched to an air supply source or an exhaust passage or the like by an electric signal from an appropriate control device.

By supplying pressure air to one air chamber 38a and draining the other air chamber 38b, the fan-shaped piston 39 is moved together with the ring 46 in the direction of arrow A, and the pressure air is supplied to the other air chamber 38b. One air chamber 38
By draining a, the sector piston 39 is returned together with the ring 46 in the direction of arrow B.

The sector piston 39 has a clutch cylinder 42, a clutch piston 43, and a clutch rod 44 integrally connected to the clutch cylinder 42 in order to connect and disconnect the power between the piston 39 and the indexing shaft 3. And the like. A clutch engagement recess 45 engageable with the rod 44 is provided in the index shaft 3
Are formed at four locations on the outer peripheral surface at equal intervals of 90 °.

The clutch piston 43 is a cylinder 42.
It is fitted in the inside so as to be movable in the radial direction, and is urged toward the shaft center side by the spring 48, whereby the clutch rod 4
4 is engaged with the clutch engagement recess 45.

The air chamber 42a on the inner side in the radial direction of the clutch cylinder 42 is provided with an air passage 47 through a fan-shaped cylinder 3.
8 communicates with the other air chamber 38b.

In the main body case 1, a limit switch 5 for detecting the piston position facing the outer peripheral surface of the ring 46 is provided.
0, 51 are arranged and one limit switch 5
0 is for detecting the rotation start position, and the rest is for detecting the rotation end position. On the other hand, on the ring 46, detectors for operating the limit switches 50 and 51 are formed at predetermined positions. As a detector, a dent,
Protrusions or magnets are provided.

In FIG. 4, a positioning plate 54 is arranged at the front end of the main body case 1 as a positioning mechanism for fixing the cross-shaped rotary table 5 at a predetermined rotation position. The lower end of the positioning plate 54 is supported by a support pin 55 extending in the left-right direction, and can swing in the front-rear direction around the pin 55.
The support pins 55 are provided on the left and right sides of the body case 1.
It is supported by a pair of brackets 57. When viewed from the front, the positioning plate 54 is formed in a fork shape in which a portion corresponding to the indexing shaft 3 is recessed downward in a semicircular shape, and at the same height as the axis of the indexing shaft 3, A pair of left and right streak-like pressing protrusions 56 protruding forward are formed.

In FIG. 7, the positioning plate 54 is biased rearward by a spring member (not shown), and is pressed forward by a pressing piston 60 arranged at the rear of the upper end. The pressing piston 60 is fitted in a cylinder 61 formed in the main body case 1 so as to be movable in the front-rear direction. The rear air chamber of the cylinder 61 is
It communicates with the air circuit in the piping manifold 34 of FIG. 6 through an appropriate air passage. Front protruding rod portion 60
A jetting air passage 63 is formed in a, and an air passage 64 that can communicate with the jetting air passage 63 is formed in the positioning plate 54.
It is opened toward the engaging groove 12 for positioning.

The cutting work will be described. As shown in FIG. 2, the rear end cruciform flange portion 16 of the four-sided vise V is fixed to the rotary table 5 of the indexing device by bolts, and the shaft portion of the vise front end portion is fixed to the bearing stand so as to keep the vise V horizontal. 6
6 support. The height of the bearing base 66 is adjusted by a spacer 67 and is fixed on the moving table 10.

The work W is placed on each of the four mounting seats 15 of the four-sided vise V, and the V-shaped block 21 is tightened with the bolts 26 so that the work W is sandwiched between the mouthpiece 22 and the flange portion 16.

When the rotating position of the indexing shaft 3 at the time of initial setting is 0 °, the indexing shaft 3 is rotated 90 ° by 90 ° to sequentially set 90 °, 180 ° and 270 °. In each process, the three works W located at the upper position and the left and right side positions are simultaneously processed. It should be noted that since the vertical and horizontal relationship of each surface of each work changes each time it rotates 90 °, in the following description, regardless of which rotational position it is located,
A surface opposite to the mounting seat 15 is referred to as a top surface, and a surface perpendicular to the top surface and parallel to the axis is referred to as a side surface.

As shown in FIG. 3, when the plane milling cutter T is mounted on the vertical machine spindle of the machine to carry out plane cutting, the top surface of the work W at the upper position and the work at both left and right positions are directed upward. A total of three side surfaces of the state are performed in one step.

The plane cutting work by the milling cutter T is performed by horizontally moving the moving table 10 back and forth, but the upper end surface of the head 30 of the main body case 1 is lower than the top surface of the work W at the upper position. Further, since the upper end surfaces of the left and right shoulder portions 31 are lower than the upward side surfaces of the work W on both the left and right sides, even if the moving table 10 is largely moved forward, the indexing device for the cutter T being machined. It is possible to secure a large moving stroke of the moving table 10 without the risk of contacting with each other.

Further, since the front bearing stand 66 also has a shape that does not project outward beyond the four-sided vise V in the range above the axial center of the indexing shaft 3, the moving table 10 can be enlarged rearward. Even if moved, the bearing stand 6 is attached to the cutter T being processed.
There is no concern that 6 will come into contact.

By performing the three-side simultaneous machining work in one step in each step of 0 °, 90 °, 180 ° and 270 °, the top surface and the left and right side surfaces of the four workpieces W are all surface ground. can do.

In addition to the above-mentioned plane cutting work by the plane milling cutter T, it can be applied to the following grinding work. That is, as shown by phantom lines in FIG. 2, as a grinding tool, a rotating grindstone T ′ is fixed to a horizontal rotating shaft 70 of a machine tool or the like, and the rotating grindstone T ′ is rotated with respect to the work W and the indexing device. By relatively moving in the horizontal front-rear direction, the top surface of the work W at the upper position and the side surfaces of the work W on the left and right sides in the upward state are surface-ground in one step.

Further, it can be applied to various kinds of processing such as groove machining in the axial direction or stepped machining. Of course, the indexing device can be fixed to a fixed table and can be applied to cutting or grinding work in which the tool is moved in the horizontal direction. Furthermore, the indexing device is set so that the indexing shaft 3 is in a vertical posture. It can also be applied to cutting or grinding work in which the tool is moved in the vertical direction relative to the indexing device.

The operation of the indexing device will be briefly described. This operation is performed by controlling the air circuit in the pipe manifold 34 by an electric signal.

FIG. 5 shows a state in which the clutch rod 44 is stopped and fixed in a predetermined process, and the clutch rod 44 has a spring 48.
Is urged toward the shaft core by the engaging recess 45 of the indexing shaft 3.
The positioning plate 54 of FIG. 4 is engaged with the engaging groove 12 for positioning the left and right grooves of the rotary table 5 in the horizontal posture.
The rotary table 5 is positioned and fixed.

When the cutting or grinding in one step is completed, the air supply to the pressing cylinder 61 of FIG. 7 is released, so that the positioning plate 54 is swung backward by the spring, and the rotary table 5 is locked. To release.

Subsequently, air is pressed into the air chamber 38a of the fan-shaped cylinder 38 shown in FIG.
8b is opened, the fan-shaped piston 39 moves in the arrow A direction, and the indexing shaft 3 rotates in the arrow A direction via the rod 44.

When the fan-shaped piston 39 rotates 90 ° in the direction of arrow A, the limit switch 51 is actuated to stop the air supply to the air chamber 38a, and subsequently the air is supplied to the pressing cylinder 61 shown in FIG. , Pressing piston 6
0 pushes the positioning plate 54 forward,
The protrusion 56 is pressed against the groove 12 of the rotary table 5 to lock the rotary table 5.

When the pressing piston 60 moves forward, it moves from the air passage 63 of the rod portion 60a to the air passage 64.
Air is jetted into the groove 12 via the to clean the inside of the groove 12.

Subsequently, air is supplied to the other air chamber 38b shown in FIG. Then, first, air is supplied to the inner air chamber of the clutch cylinder 42 through the air passage 47 of the fan-shaped piston 39, the clutch piston 43 moves radially outward, and the clutch rod 44 causes the clutch rod 44 to move. Is disengaged from the engaging recess 45.

Further, by supplying air to the air chamber 38b, the fan-shaped piston 39 returns together with the ring 46 in the direction of arrow B with respect to the indexing shaft 3. And then
When returning to the position of FIG. 5, one limit switch 50 detects it and sends a signal to the air circuit to send a signal to the air chamber 38b.
Open up. As a result, the clutch piston 43 moves to the axial center side by the spring 48 and engages with the next engagement recess 45.

[0048]

[Other Embodiments] The drive device for the indexing shaft is not limited to the one using a fan-shaped air cylinder, but various ones such as a device provided with an electric mechanism such as a step motor are conceivable. When the air cylinder is used and the fan-shaped air cylinder is arranged below the indexing shaft as in the above embodiment, the height in the axial direction can be kept low and the axial length can be made compact.

[0049]

As described above, according to the present invention,
The rotary table 5 includes a main body case 1 that supports the indexing shaft 3, and a rotary table 5 that is fixed to the tip end of the indexing shaft 3 and on which a work holding jig is detachably mounted.
Is formed in a cross shape by four arm portions 6 extending in four directions from the axis, and the outer peripheral shape of the body case 1 in the range closer to the top wall of the body case than the axis of the indexing shaft 3 is seen in the axial direction. hand,
Since it has a shape that does not project outward from the outer peripheral shape of the rotary table 5 at a predetermined indexing position, a four-sided vise with workpieces mounted on the four sides is attached as a jig to perform simultaneous three-sided machining in one step. In this case, the upper part of the main body case 1 can be effectively used as an escape space for a cutting or grinding tool.

Therefore, there are the following advantages as compared with the conventional case where a limited escape space is secured by using a spacer or the like as shown in FIG. (1) The number of parts such as spacers can be reduced. (2) It is possible to prevent the tool from colliding with the indexing device during cutting or grinding. (3) Since the supporting span of the jig or the like can be shortened, the holding rigidity of the jig can be increased and the cutting accuracy or grinding accuracy can be improved. (4) Since the mounting space in the axial direction can be made compact, it is possible to secure a processing capacity equivalent to that of a large machine even when applied to a small machine tool.

According to the second aspect of the present invention, the outer peripheral shape of the main body case in the range closer to the top wall side of the main body case than the axis of the indexing shaft is projected in the top wall side when viewed in the axial direction. Except for the corresponding part of the jig mounting bolt insertion hole of the arm part at the position where the jig is attached, the jig fixing work can be simplified and the jig can be easily stored when the jig is stored. It is possible to prevent an accident in which only the flange component hits an obstacle.

[Brief description of drawings]

FIG. 1 is a perspective view of an indexing device to which the present invention is applied.

FIG. 2 is a perspective view of the indexing device showing a state in which a jig is mounted.

FIG. 3 is a side view of the indexing device showing a state in which a jig is mounted.

FIG. 4 is a front view of the indexing device.

5 is a sectional view taken along line VV of FIG.

6 is a sectional view taken along line VI-VI in FIG.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a perspective view of a conventional example.

FIG. 9 is a front view of a conventional example.

[Explanation of symbols]

 1 Main body case 3 Indexing shaft 5 Cross-shaped rotary table 6 Arms

Claims (2)

[Claims] 1. A main body case for supporting an indexing shaft, and a rotary table fixedly attached to a tip end portion of the indexing shaft and having a work holding jig detachably mounted thereon. Is formed in a cruciform shape by four arms extending in all directions, and the outer peripheral shape of the main body case in the range closer to the top wall of the main body case than the axis of the indexing shaft is viewed in the axial direction, An indexing device having a shape that does not project outward from the outer peripheral shape of the rotary table. 2. The indexing device according to claim 1, wherein the outer peripheral shape of the main body case in the range closer to the top wall side of the main body case than the axis of the indexing shaft is projected in the top wall side when viewed in the axial direction. An indexing device characterized in that a stepped shape is formed along the outer peripheral shape of the rotary table, except for a portion corresponding to a bolt insertion hole for mounting a jig on the arm portion in a posture to be changed.