JPH0331452Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is useful when positioning a mold plate in a press mold holder, or when positioning a resin molding mold on a molding machine mounting plate. The present invention relates to a positioning member to be used, and particularly to a positioning member having a retaining mechanism.

[Prior art] When attaching a mold plate with upper and lower molds attached to a die set holder, etc., when accurately positioning and fixing the plate to the base,
Some positioning member is required in addition to the clamping device. Some of these positioning members include a guide member that guides the side surface of the plate at a predetermined position on the base. However, in general, two or more positioning holes with the same inner diameter are formed at corresponding positions on the base and plate, and positioning pins such as dowel pins are inserted into these positioning holes to position the base and plate. It is being said.

FIGS. 3a and 3b show a conventional positioning member. Of these, Fig. 3a shows a plate 2 such as a mold plate mounted on a base 1 such as a die set holder.
A dowel pin 3 is used when positioning. That is, positioning holes 1a and 2a having approximately the same inner diameter are formed in the base 1 and plate 2 at corresponding predetermined positions, and the dowel pins 3 are press-fitted into the positioning holes 1a by communicating with the positioning holes 1a and 2a. The plate 2 is inserted into the positioning hole 2a in a fitted state, and the plate 2 is positioned with respect to the base 1. Thereafter, the plate 2 is fixed to the base 1 using a separate clamping device such as screwing with bolts.

Further, FIG. 3b shows another positioning member. That is, the plate 2 is positioned with respect to the base 1 by fitting the positioning pin 4 with a flange having a parallel portion into the positioning holes 1b and 2b formed in the base 1 and the plate 2 and having the same inner diameter. Then, use a separate clamping device to attach the base 1.
The plate 2 is fixed to the plate 2.

On the other hand, as the trend toward high-mix, low-volume production increases, the number of times molds need to be replaced in press molds, resin molding molds, etc. increases, and the demand for rapid mold replacement also increases. Therefore, for press molds, it is easy to position the mold plate on which the mold is placed relative to the die set holder, and for resin molding molds, it is easy to position the mold plate on the movable or fixed platen of the molding machine. It has become necessary to facilitate the positioning of plates.

[Problem that the invention attempts to solve]

However, in the conventional example shown in FIG. When attaching or detaching the plate 2 from the base 1, you must remove the press-fitted dowel pin 3, remove the plate 2, press-fit the dowel pin 3 again into the positioning hole 1a of the base 1, and then attach another plate 2. Must be. Alternatively, after separating and removing the plate 2 from the base 1, another plate 2 must be attached.

In any case, if the dowel pin 3 is repeatedly press-fitted and removed, the straightness of the dowel pin 3 will be lost, and if the heavy plate 2 is not inserted parallel to the base 1 when a mold is placed, the positioning of the plate 2 will be difficult. Galling will occur in the hole 2a and the dowel pin 3. Moreover, it takes time to attach and detach the plate 2, and repeating the attachment and detachment significantly reduces the positioning accuracy.

Furthermore, in the conventional example shown in FIG.
2b, the positioning pin 4 can be easily attached and detached. Therefore, it becomes easy to attach and detach the plate 2, and the positioning hole 1 is
There is no galling in b, 2b and the positioning pin 4, and the reproducibility of positioning accuracy is also good.
However, if the press mold is subjected to strong impact or mechanical vibration during operation, the positioning pins will fall out of the positioning holes 1b and 2b, making it impossible to position the plate 2 with respect to the base 1. Therefore, in a press mold or a resin molding mold, the integrity of the mold is impaired, causing damage to the mold. Furthermore, when positioning a workpiece on a processing table of a machine tool, there is a problem in that the workpiece cannot be accurately machined.

There is also a positioning member that is equipped with an elevating mechanism consisting of a hydraulic cylinder, gears, etc., and has a positioning pin that can freely move in and out of the base. However, the base and positioning pins require special processing, making the structure complex, and the positioning positions of the positioning pins are regulated, which poses the problem that it can only be applied to positioning specific objects.

[Means for solving problems]

The present invention was developed in view of the above-mentioned problems, and allows the plate to be easily positioned with respect to the base with a simple structure, and after positioning, the positioning member can be repeatedly attached and detached without falling off. It is an object of the present invention to provide a positioning member whose positioning accuracy is not impaired even when the positioning member is moved.

In order to achieve the above-mentioned object, the configuration of the present invention is such that the first positioning hole formed in the base and the second positioning hole formed in the plates are consistently and removably inserted into the base. In the positioning member for positioning and fixing plates thereon, a positioning pin is slidably fitted into the first and second positioning holes and has a through hole at a position eccentric to the central axis, and a positioning pin that is fitted almost tightly into the through hole a rotation shaft inserted into and rotatable; a clamp plate disposed at the insertion end of the rotation shaft; an operation plate disposed at the other end of the rotation shaft; A recess is formed on one side of the positioning pin and a convex part is formed on the other side, and an engaging part is interposed between the positioning pin and the operation plate, and the recess and the convex part engage depending on the rotational position of the rotation shaft. and a spring that constantly presses the clamp plate against the positioning pin.

(Function) Since the positioning member of the present invention has the above structure, the clamp plate can be moved by rotating the operating plate after inserting the positioning pin of the positioning member into the positioning hole of the base and plates. protrudes from the outer periphery of the positioning pin and engages with the outer surface of the plate or a recess formed in the first positioning hole,
This has the effect of preventing the positioning member from falling off.

〔Example〕

The positioning member of the present invention will be explained in detail below with reference to the drawings. FIG. 1 shows a press die using the positioning member of the present invention, and the positioning member of the present invention will be explained based on this press die.

The press die 20 has an upper die holder 2 as a base.
1 and a lower mold holder 27, and an upper mold holder 21.
is configured to be able to move up and down with respect to the lower mold holder 27 by a guide mechanism consisting of a guide bush 25 and a guide post 26. On the lower surface of the upper mold holder 21 and the upper surface of the lower mold holder 27,
The mold plates 22 and 28 on which the upper mold 29 and lower mold 30 are mounted, shown by chain lines, are positioned by the positioning member a, which is the gist of the present invention, and the bolts 31,
31.

That is, the upper die holder 21 and the lower die holder 27 are respectively formed with at least two positioning holes 21a and 27a as first positioning holes, and a positioning bush is provided for each of the positioning holes 21a and 27a. 24 is inserted. On the other hand, positioning holes 22a and 28a are formed in the mold plates 22 and 28 as second positioning holes corresponding to the positioning holes 21a and 27a, respectively. Then, the positioning member a is inserted into the positioning hole 22a and the bush 24 so that the mold plate 22 is connected to the upper mold holder 21.
The positioning member a is inserted into the positioning hole 28a and the bush 24 in communication with each other, and the mold plate 28 is positioned with respect to the lower mold holder 27. Note that the upper mold holder 21 is provided with a guide member 23a for guiding the side surface of the mold plate 22 to prevent it from falling when the mold plate 22 is mounted, and the lower mold holder 27
A guide member 23b is provided to guide the side surface of the mold plate 28 when the mold plate 28 is mounted, thereby facilitating the mounting of the mold plates 22, 28.

Next, the structure and operation of the positioning member a of the present invention will be explained in detail with reference to FIGS. 2a and 2b.

FIG. 2a is an enlarged cross-sectional view of a main part showing a state in which the mold plate 28 is positioned on the base 27, and FIG. 2b is a cross-sectional view taken along the line A--A in FIG. 2a.

The positioning member a can be roughly divided into mold plate 2.
The positioning pin 51 is fitted into the bush 24 which is fitted into the positioning hole 28a of No. 8 and the large diameter portion 27b of the positioning hole 27a of the lower die holder 27, and the rotation shaft 5 serves as a mechanism to prevent the positioning pin 51 from coming off.
2, an operation plate 53 and a clamp plate 54.

The positioning pin 51 is connected to the positioning hole 28.
a and the parallel part 51a fitted into the bush 24
A through hole 51b is formed eccentrically from the central axis in the axial direction. In addition, a parallel portion 51 is provided at the insertion end of the positioning pin 51.
A groove 51c is formed that passes through the central axis of a and the central axis of the through hole 51b. This groove 51c is
This is a recessed portion that forms an engaging portion with a protrusion 54a of a clamp plate 54, which will be described later. On the other hand, a recess 51d substantially concentric with the through hole 51b is formed at the other end,
This serves as a housing portion for a spring 56, which will be described later.

Further, the rotation shaft 52 is connected to the positioning pin 51.
It is inserted almost tightly into the through hole 51b of , and is configured to be freely rotatable. A protrusion 52a is formed at one end of the rotation shaft 52, and a groove 52b having approximately the same width as the groove 51c of the positioning pin 51 is formed at the other end to strengthen the connection with an operation plate 53 and a clamp plate 54, which will be described later. I have to.

Further, the operation plate 53 has the positioning pin 5
A recess 53a is formed at a position that has approximately the same outer diameter as the flange 1 and is eccentric to the same extent as the positioning pin 51, and that fits into the projection 52a of the rotation shaft 52. The operation plate 53 is screwed onto the rotating shaft 52 by a screw 55. On the other hand, the insertion end of the rotation shaft 52 has a projection 54a inserted into the groove 52b.
A disk-shaped clamp plate 54 having a diameter smaller than the outer diameter of the parallel portion 51a is screwed eccentrically by a screw 55. Furthermore, the protrusion 54a
is formed to pass through the shape center and rotation center of the clamp plate 54. and the protrusion 54
a is a convex portion that constitutes an engaging portion with the groove 51c of the positioning pin 51, and the groove 51 as a concave portion of the positioning pin 51 is rotated by the rotation of the rotation shaft 52.
c, and prevents the clamp plate 54 from rotating. Note that a spring 56 is compressed and interposed between the recess 51d of the positioning pin 51 and the operation plate 53, and pushes the operation plate 53 and the clamp plate 54 upward.

In FIGS. 2a and 2b, the clamp plate 54 is attached to the lower mold holder by the positioning member a with its protrusion 54a engaging with the groove 51c and protruding from the outer periphery of the parallel portion 51a. Even if the mold plate 28 is positioned at 27 and an attempt is made to pull out the positioning member a upward, the clamp plate 54 abuts against the bush 24 and cannot be pulled out.

On the other hand, when removing the mold plate 28 from the lower mold holder 27, a separately provided clamping device (first
In the figure, the bolt 31) must be unclamped and the positioning member a must be pulled out. When removing the positioning member a, first push down the operation plate 53 to completely disengage the protrusion 54a of the clamp plate 54 from the groove 51c of the positioning pin 51, and then rotate the operation plate 53 180 degrees as shown by the dashed line. When the clamp plate 54 is moved, the clamp plate 54 also rotates 180 degrees, and its protrusion 54a engages with the groove 51c again as shown by the dashed line. The clamp plate 54 is housed within the outer periphery of the parallel portion 51a of the positioning pin 51, and the positioning member a can be easily removed.

As described above, since the positioning member a is fitted into the positioning hole 28a of the mold plate 28 and the bush 24 attached to the base 27, it is easy to attach and detach, and even if it is repeatedly attached and detached, the positioning accuracy will be lost. You won't be hit. Further, the positioning member a is connected to the positioning hole 28a and the bush 24.
When the operating plate 53 is pushed down and rotated after being inserted into the positioning member 53, the clamp plate 54 also rotates and protrudes from the outer periphery of the parallel portion 51a, so that the positioning member a will not fall off due to vibration or impact. Also, the operation panel 53
The clamp plate 54 has a protrusion 52a and a recess 53a, a groove 52b and a protrusion 54a relative to the rotation shaft 52.
Since they are engaged, there is no possibility of idle rotation. Furthermore, the clamp plate 54 is always urged upward by the repulsive force of the spring 56, and when the clamp plate 54 is operating as a retaining mechanism, the protrusion 54a constituting the convex part of the engaging part Groove 51 forming the recess
c, operation is confirmed, and the clamp plate 54 does not rotate due to vibration or the like. Due to the eccentric state of the operation plate 53 with respect to the positioning pin 51 (the operation plate 53 is not eccentric when the clamp plate 54 is operating as a retaining mechanism, and is in a centered state when it is not operating), the clamp plate 54 is It is possible to determine whether the locking mechanism is working or not.

[Other Examples]

In the previous embodiment, an example was shown in which a bushing was fitted into the plate serving as a base to form a positioning hole, but the positioning hole may be formed directly in the plate. Further, the shapes of the operation plate and the clamp plate can be changed in various ways depending on the operability or function. And, even if the clamp plate is not eccentric to the rotation axis,
If the clamp plate is vertically elongated in the direction perpendicular to the line connecting the center of the rotation axis and the center of the positioning pin when not in operation, the locking mechanism can be activated or deactivated by rotating the clamp plate by 90 degrees. can be repeated.

Furthermore, by making the length of the positioning pins shorter than the positioning holes of each plate, it is possible to give the clamp plate a clamping action. On the other hand, even if the length of the positioning pin is longer than the positioning hole of each plate, the function as a positioning member is not impaired even if there is some play in the vertical direction.

In addition, in the previous example, an example was shown in which the positioning member of the present invention was used in a press mold, but when performing secondary processing of a workpiece on the table of a machine tool, or in a molding machine for a resin molding mold. The present invention is applicable to all cases where a pin is inserted into a positioning hole for positioning, such as positioning against a positioning hole. If the shapes of the positioning holes on the two plates are different, adjust the positioning pins using the bushings, or if the positioning holes on the plate to be inserted are large, adjust the shape of the positioning pins to match the respective positioning holes. It may be attached.

〔effect〕

As described above, the positioning member of the present invention is fitted into the positioning hole and has a retaining mechanism. Therefore, the configuration is simple, the positioning member can be easily attached and detached, and even if the positioning member is repeatedly attached and detached, the positioning accuracy does not decrease, and the positioning reproducibility is good. In addition, since the positioning member can be prevented from falling out simply by rotating the operation plate, the positioning member will not fall out of the positioning hole of the plate even when vibrations or shocks are applied, especially in press molds. Furthermore, it is possible to determine whether the clamp plate is in an activated state or a non-activated state based on the engaging portion.
In this way, highly accurate positioning can be maintained at all times while being worn.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the installed state of the positioning member of the present invention, FIGS. 2 a and b are sectional views showing an embodiment of the positioning member of the present invention, and FIGS. 3 a and b are
FIG. 3 is a diagram showing a state in which a conventional positioning member is attached. 21... Upper holder as a base, 27... Lower holder as a base, 22, 28... Mold plate, 21a, 27a... First positioning hole, 22
a, 28a...second positioning hole, a...positioning member, 51...positioning pin, 52...rotation shaft, 53...operation plate, 54...clamp plate, 51
c...Groove forming the recess of the engaging portion, 54a...Protrusion forming the convex portion of the engaging portion.

Claims (1)

[Scope of utility model registration request] In the positioning member that is removably fitted into a first positioning hole formed in the base and a second positioning hole formed in the plates, the positioning member positions and fixes the plates on the base; a positioning pin that is slidably fitted into the first and second positioning holes and has a through hole at a position eccentric to the central axis; a rotation shaft that is almost tightly inserted into the through hole and is rotatable; A clamp plate disposed at the insertion end of the rotation shaft, an operation plate disposed at the other end of the rotation shaft, a concave portion on one of the clamp plate or the positioning pin, and a convex portion on the other. an engaging portion formed between the concave portion and the convex portion to engage with each other depending on the rotational position of the rotation shaft; and an engaging portion interposed between the positioning pin and the operation plate, and constantly pressing the clamp plate against the positioning pin. A positioning member comprising a spring.