JPH0629814U - Mold - Google Patents

Abstract

(57) [Summary] [Objective] To provide a molding die capable of improving the positional accuracy during molding. [Structure] The upper die 1 is formed of an upper plate member 3 and an upper piece member 4. The lower die 2 is formed of a lower plate member 5 and a lower piece member 6. The piece members 4 and 6 are inserted into the insertion holes 3a and 5a of the plate members 3 and 5, respectively. The piece members 4 and 6 have pressing portions 7 and 8 that cannot be inserted into the insertion holes 3a and 5a. Grooves 3b, 5 in the insertion holes 3a, 5a
b is formed, and the elastic rings 9 and 10 are provided in the groove portions 3b and 5b. The piece members 4 and 6 are held by the elastic force of the elastic rings 9 and 10. At this time, the pressing portions 7 and 8 have elastic rings 9 and 1, respectively.
Activated at 0. At the time of mold clamping, the elastic rings 9 and 10 are compressed to generate elastic force. When the mold is opened, the elastic members 9 and 10 move the piece members 4 and 6 in directions away from each other. Therefore, even if the piece members 4 and 6 are displaced, the piece members 4 and 6 are restored to their initial positions by the elastic force of the elastic rings 9 and 10 when the mold is opened, so that the positional accuracy at the time of molding is secured. It

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a molding die, and more particularly, to a molding die which can obtain a product having a predetermined shape by vulcanizing a cloth made of a rubber-like elastic material or the like.

[0002]

[Prior art and its problems]

 Conventionally, as this type of molding die, those shown in FIGS. 7 and 8 are generally known. That is, the molding die shown in FIGS. 7 and 8 includes an upper die 21 and a lower die 22 which can be brought into contact with and separated from each other, and the upper die 21 includes an upper plate member 23 having an insertion hole 23a and The upper die member 24 is inserted into the insertion hole 23a of the upper plate member 23 and is held and fixed by the spring pin 34, and the lower die 22 is formed with the lower plate member 25 having the insertion hole 25a. Formed by a lower piece member 26 which is inserted into the insertion hole 25a of the lower plate member 25 and is held / fixed by a spring pin, and which forms a cavity 31 in cooperation with the upper piece member 24. Then, the cavity 31 is filled with the unvulcanized dough, and then the mold is clamped, so that the dough is vulcanized to obtain a product having a predetermined shape.

In FIGS. 7 and 8, the upper die 21 can contact and separate from the lower die 22, and is formed of an upper plate member 23 and an upper piece member 24.

The upper plate member 23 forming one of the upper molds 21 is formed with insertion holes 23a at a plurality of locations. Each of the insertion holes 23a has a piston shape and a product mold surface of a predetermined shape. The upper piece members 24 formed with 31a are respectively inserted.

Between the upper plate member 23 and the upper piece member 24, one spring pin 34 is provided in a position slightly compressed as shown in FIG. The upper piece member 24 is held relatively firmly by the urging force of the spring pin 34, whereby the upper piece member 24 is fixed to the upper plate member 23.

The lower die 22 that comes into contact with and separates from the upper die 21 is formed by a lower plate member 25 and a lower piece member 26.

The lower plate member 25 forming one of the lower molds 22 is formed with a plurality of insertion holes 25a at positions corresponding to the insertion holes 23a of the upper plate member 23. The lower piece members 26 each having a piston shape and having a product mold surface 31b of a predetermined shape are inserted.

A spring pin is provided in a slightly compressed state between the lower plate member 25 and the lower piece member 26, and the lower piece member 26 is held by the urging force of the spring pin. As a result, the lower piece member 26 is fixed to the lower plate member 25.

When the upper die 21 and the lower die 22 are brought into contact with each other, the upper piece member 24 of the upper die 21 and the lower piece member 26 of the lower die 22 are aligned with each other. By matching with the lower piece member 26, a cavity 31 is formed between the upper piece member 24 and the lower piece member 26, which is defined by the product mold surfaces 31a and 31b of both piece members 24 and 26. There is.

The molding die configured as described above has a space between the upper piece member 24 of the upper die 21 and the lower piece member 26 of the lower die 22 when the upper die 21 and the lower die 22 are brought into contact with each other. When the formed cavity 31 is filled with a material made of rubber-like elastic material in an unvulcanized state and then the mold is clamped, the material is vulcanized and molded in the cavity 31. As a result, A product having a shape corresponding to the product mold surfaces 31a and 31b can be obtained.

However, in the conventional molding die as described above, the positional accuracy of the die may not be sufficiently obtained.

That is, as described above, when the upper piece member 24 is fixed to the upper plate member 23 by the urging force of the spring pin 34, the arrangement position of the spring pin 34 in the upper die 21 is not determined. In some cases, the center position O1 of the insertion hole 23a of the upper plate member 23 and the center position O2 of the upper piece member 24 do not coincide with each other, which may cause a deviation β as shown in FIG.

Since this is the same in the lower die 22, the center position of the lower piece member 26 may deviate from the center position of the insertion hole 25a of the lower plate member 25 depending on the position where the spring pin is arranged. There is.

When the mounting position of the upper piece member 24 with respect to the upper plate member 23 and the mounting position of the lower piece member 26 with respect to the lower plate member 25 are deviated as described above, the upper piece member 24 and the lower piece member 24 are lowered during mold clamping. Since the mating with the piece member 26 is not performed well, the product mold surface 31a of the upper piece member 24 and the product mold surface 31b of the lower piece member 26 are displaced in the horizontal direction, and the cavity 31 becomes appropriate. Therefore, the accuracy of the molding die is reduced.

In the mounting method as described above, the piece members 24 and 26 are fitted into the plate members 23 and 25 by a so-called clearance fit, but in addition to this, a so-called fit is used. The piece members 24 and 26 may be attached to the plate members 23 and 25 by a fit called a female member.

In the case of this interference fit, the piece members 24 and 26 are fitted into the plate members 23 and 25 with no gap, and the plate members 23 and 25 are tightened to secure the piece members 24 and 26. The piece members 24 and 26 are fixed by the tightening force, but at this time, the plate members 23 and 25 warp due to the influence of the fitting, so that accuracy as a molding die can be obtained. There was a problem that it did not exist.

In the conventional mold as described above, the piece members 24 and 26 are urged by the spring pins 34, or are fitted by the fitting of the interference fit, so that the plate members 23 and 25 are formed. Since the vertical direction deviation γ as shown in FIG. 10 is temporarily generated in the piece members 24, 26 for some reason, the product mold surfaces 31a, 31b of the piece members 24, 26 are displaced from each other. Molding will continue as it is, and it will be difficult to find any defects.

An object of the present invention is to solve the above problems and provide a molding die capable of improving the positional accuracy during molding.

[0019]

[Means for solving problems]

 In order to solve the above problems, the present invention provides a mold having an upper mold and a lower mold which can be brought into contact with and separated from each other, wherein the upper mold has an upper plate member having an insertion hole and the insertion hole. An upper piece member that has a pressing portion formed with a size that cannot be inserted and that is inserted into the insertion hole of the upper plate member; and an upper piece member and an upper piece member that are in contact with the pressing portion. An elastic member that is provided between the upper plate member and the upper plate member and can move the upper plate member in the vertical direction and the horizontal direction, and keeps the pressing portion in a state of protruding from the upper plate member in a normal state. The lower die has a lower plate member having an insertion hole and a pressing portion formed with a size that cannot be inserted into the insertion hole, and is inserted into the insertion hole of the lower plate member. And a lower piece member that forms a cavity in cooperation with the upper piece member of the upper die and the pressing member. Is provided between the lower plate member and the lower piece member in a state of being in contact with the lower plate member, the lower piece member is movable in the vertical direction and the horizontal direction with respect to the lower plate member, and in the normal state, The pressing portion is formed of an elastic ring that holds the lower piece in a state of protruding from the lower piece member, so that when the mold is clamped, the upper piece member of the upper die and the lower piece member of the lower die form the elastic ring of the elastic ring. A direction in which the upper mold member and the lower mold member of the lower mold are separated from each other by the elastic force of the elastic ring when the mold is opened and the cavity is formed by approaching against the elastic force. It has a structure to move to and restore to the initial position.

[0020]

[Action]

 This invention adopts the above-mentioned means, and when the cavity formed by the upper die member of the upper die and the lower die member of the lower die is filled with the unvulcanized material, the die is clamped. The dough is vulcanized to obtain a product having a predetermined shape.

Further, in this invention, the positional accuracy at the time of molding can be improved.

That is, by providing the elastic ring between the piece member and the plate member forming the mold, the piece member is held so as to be clamped from the entire circumference by the elastic force of the elastic ring. Therefore, the piece member does not shift in the horizontal direction with respect to the plate member during the mounting.

Further, at this time, by contacting the elastic ring with the pressing portion of the piece member, the piece member is constantly urged by the elastic force of the elastic ring. Even if there is a deviation in the direction, when the mold is opened, the elastic force of the elastic ring moves the upper piece member and the lower piece member in the direction in which they are separated from each other and restores them. It is set to the initial position.

Therefore, in this forming die, the displacement of the piece member is corrected every time the die is opened, so that the position of the piece member with respect to the plate member at the time of forming is changed with respect to the vertical direction and the horizontal direction. It has always been positioned with a certain precision, which makes it possible to ensure the quality of the molded product.

Further, in the present invention, since the piece member is held by the plate member by the elastic force of the elastic ring, the fitting between the piece member and the plate member becomes suitable, which has occurred in the past. As described above, it is possible to prevent the warp of the plate member due to the fitting with the piece member.

[0026]

【Example】

 Embodiments of the present invention shown in the drawings will be described below.

FIG. 1 is a view showing an embodiment of a molding die according to the present invention. That is, the mold shown in FIG. 1 is composed of an upper mold 1 and a lower mold 2 that can be brought into contact with and separated from each other, and the upper mold 1 cannot be inserted into the upper plate member 3 having the insertion hole 3a and the insertion hole 3a. Between the upper plate member 3 and the upper piece member 4 in a state of being in contact with the pressing portion 7, the upper piece member 4 having a pressing portion 7 having a large size and being inserted into the insertion hole 3a of the upper plate member 3. And an elastic ring 9 that holds the upper piece member 4 in a vertically movable state, and the lower die 2 cannot be inserted into the lower plate member 5 having an insertion hole 5a and the insertion hole 5a. The lower piece member 6 which has a pressing portion 8 of various sizes and which is inserted into the insertion hole 5a of the lower plate member 5 and cooperates with the upper piece member 4 to form the cavity 11 and the pressing portion 8. It is formed by an elastic ring 10 which is provided between the lower plate member 5 and the lower piece member 6 in an abutting state and holds the lower piece member 6 in a vertically movable state. By filling the cavity 11 with the unvulcanized dough and then clamping the mold, the dough is vulcanized to obtain a product with a predetermined shape. In addition, the upper piece member 4 and the lower piece member 6 move in the directions in which they are separated from each other by the elastic force of the elastic rings 9 and 10 and are restored to their initial positions.

In FIG. 1, the upper mold 1 is capable of contacting and separating from the lower mold 2, and is formed by an upper plate member 3, an upper piece member 4 and an elastic ring 9.

As shown in FIG. 2, the upper plate member 3 forming one of the upper molds 1 has insertion holes 3a at a plurality of positions, and the inner wall forming the insertion holes 3a has The step portion 3c is formed in the middle thereof, so that the annular groove portion 3b communicating upward is formed.

The upper piece members 4 are vertically movably inserted into the respective insertion holes 3 a of the upper plate member 3. The upper piece member 4 has a piston shape as a whole, and a product mold surface 11a having a predetermined shape is formed on the lower end surface of the upper piece member 4. Further, the upper piece member 4 has an insertion hole 3a at the upper end portion thereof. The pressing portion 7 is formed to have a size that cannot be inserted into.

The pressing portion 7 of the upper piece member 4 is formed so as to fit in the groove portion 3b of the upper plate member 3, and the pressing portion 7 is movable in the vertical direction within the groove portion 3b. In this case, the pressing portion 7 can be brought into contact with or separated from the press platen 12 of the press machine, and the pressing member 7 is pressed by the press platen 12 to move the upper piece member 4 downward. I am trying to move.

The upper piece member 4 is formed with the pressing portion 7 that cannot be inserted into the insertion hole 3a of the upper plate member 3, so that the upper piece member 4 is stepped in the middle of its movement. It is locked to the portion 3c so as to prevent further downward movement.

An elastic ring 9 is arranged in the groove 3 b of the upper plate member 3. The elastic ring 9 is arranged such that the pressing portion 7 is in contact with one end face of the elastic ring 9 and the step portion 3c of the upper plate member 3 is in contact with the other end face thereof. Make sure that the upper piece member 4 is inserted in the upper part.

In this case, the elastic ring 9 is, for example, an O-ring made of a rubber-like elastic material as shown in FIG. 3, and in this case, the width dimension w is formed in the upper plate member 3. Further, a groove having a larger depth W than the groove portion 3b (W <w) is used.

As a result, the elastic ring 9 is provided in the groove portion 3b in a state of being slightly compressed by the upper plate member 3 and the upper piece member 4, and due to the elastic force of the elastic ring 9 generated during this compression, The upper piece member 4 is held in a state of being vertically movable and horizontally movable with respect to the upper plate member 3.

At this time, when the upper piece member 4 is pressed from above by the press platen 12 so that the upper end surface of the upper piece member 4 is aligned with the upper end surface of the upper plate member 3, the upper piece member 4 is formed on the upper plate member 3. The distance H between the facing surfaces of the step portion 3c and the pressing portion 7 of the upper piece member 4 is set to be sufficiently smaller than the natural thickness h of the elastic ring 9 (H << h). deep.

Further, in this case, in the normal state (when no pressure is applied), the upper piece member 4 is biased upward by the elastic force of the elastic ring 9, whereby the upper piece member 4 is The upper end surface is held by the upper plate member 3 in a state of being protruded from the upper end surface of the upper plate member 3 by a predetermined protrusion amount a (a = h−H).

Therefore, in a state where the upper end surface of the upper piece member 4 and the upper end surface of the upper plate member 3 are flush with each other (during pressure), the elastic ring 9 is compressed in the axial direction in the upper plate. Since it is located in the groove 3b of the member 3, an elastic force in the axial direction is generated in the elastic ring 9. However, it is necessary to consider that the elastic ring 9 does not exceed the limit of its compression set during the pressurization.

The lower mold 2 that comes into contact with and separates from the upper mold 1 is formed of a lower plate member 5, a lower piece member 6 and an elastic ring 10.

The lower plate member 5 forming one of the lower molds 2 has through holes 5a at a plurality of portions corresponding to the through holes 3a of the upper plate member 3, and the through holes 5a are formed. A step portion 5c is formed in the middle of the inner wall to form an annular groove portion 5b communicating downward.

The lower piece members 6 are vertically movably inserted into the respective insertion holes 5 a of the lower plate member 5. The lower piece member 6 has a piston shape as a whole, a product mold surface 11b of a predetermined shape is formed on the upper end surface thereof, and the lower end member 6 has an insertion hole 5a at the lower end portion thereof. The pressing portion 8 is formed in such a size that it cannot be inserted through.

Then, when the upper die 1 and the lower die 2 are brought into contact with each other, the upper piece member 4 of the upper die 1 and the lower piece member 6 of the lower die 2 can be matched and separated from each other by their vertical movement. When the upper piece member 4 and the lower piece member 6 are matched with each other, the product mold surface 11a of both the piece members 4 and 6 is provided between the upper piece member 4 and the lower piece member 6. , 11b to form a cavity 11.

The pressing portion 8 of the lower piece member 6 is formed so as to fit in the groove 5b of the lower plate member 5, and the pressing portion 8 is movable in the vertical direction in the groove 5b. In this case, the pressing portion 8 can come into contact with and separate from the press platen 13 of the press machine, and the pressing member 8 is pressed by the press platen 13 to move the lower piece member 6 upward. I am trying to move.

The lower piece member 6 is formed with a pressing portion 8 that cannot be inserted into the insertion hole 5a of the lower plate member 5, so that the lower piece member 6 is stepped in the middle of its movement. It is locked to the portion 5c so as to prevent further upward movement.

The elastic ring 10 is arranged in the groove 5 b of the lower plate member 5. The elastic ring 10 is arranged such that the pressing portion 8 is in contact with one end surface of the elastic ring 10 and the step portion 5c of the lower plate member 5 is in contact with the other end surface thereof. Then, the lower piece member 6 is inserted.

In this case, the elastic ring 10 is an O-ring or the like made of, for example, a rubber-like elastic material, like the elastic ring 9 of the upper mold 1 described above, and in this case, the width dimension thereof is lower. A material having a larger groove depth than the groove portion 5b formed in the material 5 is used.

As a result, the elastic ring 10 is provided in the groove portion 5b in a state of being slightly compressed by the lower plate member 5 and the lower piece member 6, and due to the elastic force of the elastic ring 10 generated during this compression. The lower piece member 6 is held in a state of being movable in the vertical and horizontal directions with respect to the lower plate member 5.

At this time, when the upper piece member 4 is pressed from below by the press platen 13 so that the lower end surface of the upper piece member 4 is aligned with the lower end surface of the lower plate member 5, it is formed on the lower plate member 5. The distance between the facing surfaces of the step portion 5c and the pressing portion 8 of the lower piece member 6 is set to be sufficiently smaller than the thickness of the elastic ring 10 in the natural state.

Further, in this case, in the normal state (when no pressure is applied), the pressing portion 8 of the lower piece member 6 is urged downward by the elastic force of the elastic ring 10, whereby the lower piece member is 6 is held by the lower plate member 5 in a state in which its lower end surface is projected from the lower end surface of the lower plate member 5 by a predetermined protrusion amount a.

Therefore, in a state where the lower end surface of the lower piece member 6 and the lower end surface of the lower plate member 5 are flush with each other (when pressure is applied), the elastic ring 10 is compressed in the axial direction in the lower plate. Since it is located in the groove 5b of the member 5, elastic force in the axial direction is generated in the elastic ring 10. However, at the time of this pressurization, it is necessary to consider so that the elastic ring 10 does not exceed the limit of its permanent compression strain.

Next, the operation of the above will be described.

This forming die is configured as described above, and after filling the cavity 11 formed between the upper die 1 and the lower die 2 with the dough, the die is clamped by the press plates 12 and 13. When done, the dough is vulcanized to obtain a product with a predetermined shape.

First, when the upper die 1 and the lower die 2 are brought into contact with each other, the cavities 11 formed between the upper piece member 4 of the upper die 1 and the lower piece member 6 of the lower die 2 are not yet applied. A dough made of rubber-like elastic material in a vulcanized state is filled. After that, as shown in FIG. 4, the upper plate member 4 and the lower plate member 6 are pressed from above and below by the press plates 12 and 13 of the press machine to perform mold clamping.

In this case, the upper piece member 4 and the lower piece member 6 are in a state of protruding by a from the upper plate member 3 and the lower plate member 5 as shown in FIG. , The upper piece member 4 and the lower piece member 6 are clamped until the end portions of the piece members 4 and 6 are aligned with the end surfaces of the plate members 3 and 5, respectively. When the and the elastic rings 9 and 10 approach each other against the elastic force, the upper piece member 4 and the lower piece member 6 are aligned with each other to define the cavity 11, and the material is vulcanized in the cavity 11. As a result, the dough is molded, and as a result, a product having a shape corresponding to the product mold surfaces 11a 1 and 11b is obtained.

In addition, in the above-mentioned molding die, it is possible to sufficiently secure the positional accuracy during molding.

That is, by providing annular elastic rings 9 and 10 in the groove portions 3 b and 5 b of the plate members 3 and 5, the elastic rings 9 and 10 are provided between the plate members 3 and 5 and the piece members 4 and 6. Because of the elastic force of the elastic rings 9 and 10, the bridge members 4 and 6 receive the uniform tightening force of the elastic rings 9 and 10 from their entire circumferences, and are always in a predetermined state. The positions of the piece members 4 and 6 are prevented from shifting in the horizontal direction.

In addition, even if the piece members 4 and 6 are displaced in the horizontal direction, the displaced piece members 4 and 6 are moved to correct positions by the elastic force of the elastic rings 9 and 10 to correct them. Therefore, the piece members 4 and 6 are always positioned in a predetermined state with respect to the plate members 3 and 5 in the horizontal direction.

Further, in this case, the piece members 4 and 6 are designed to be automatically corrected even if a vertical displacement occurs.

That is, the elastic rings 9 and 10 of the plate members 3 and 5 are in contact with the pressing portions 7 and 8 of the piece members 4 and 6 and the step portions 3c and 5c of the plate members 3 and 5, respectively. Since the piece members 4 and 6 are always urged by the elastic rings 9 and 10 by being provided in the grooves 3b and 5b, this allows the piece members 4 and 6 to move in the vertical direction during mold clamping. Even if the pieces are displaced from each other, when the mold is opened, the elastic forces of the elastic rings 9 and 10 move the pieces 4 and 6 in a direction in which they are separated from each other, so that the vertical shift of the pieces 4 and 6 is corrected. Has become.

For example, as shown in FIG. 5, when the foreign matter 14 is sandwiched between the lower piece member 6 and the press platen 13 during mold clamping, the presence of the foreign matter 14 causes the lower piece member 6 to move to the lower plate member. 5, a vertical deviation α occurs, but at this time, the elastic ring 10 is pressed between the pressing portion 8 of the lower piece member 6 and the step portion 5c of the lower plate member 5 by the pressure due to the mold clamping. Since it is in a compressed state, the elastic force of the elastic ring 10 acts downward on the pressing portion 8 of the lower piece member 6.

In this case, the lower piece member 6 is held in a state of being vertically movable with respect to the lower plate member 5 by the tightening force of the elastic ring 10. Therefore, when the mold is opened, as shown in FIG. As shown in the figure, the elastic force in the axial direction of the elastic ring 10 generated by the mold clamping pushes the pressing portion 8 to move the lower piece member 6 downward, whereby the lower piece member 6 moves its lower end surface. It is positioned in a state of being protruded from the lower end surface of the lower plate member 5 by the protrusion amount a.

As a result, the lower piece member 6 is restored to the initial position. Therefore, by removing the foreign matter 14 that has caused the deviation α of the lower piece member 6 here, the next forming work is performed. Therefore, the deviation α of the lower piece member 6 is eliminated, and accurate molding can be performed.

The above-described molding die uses the elastic force of the elastic rings 9 and 10 to obtain a holding force for the piece members 4 and 6, and a restoring force to restore the piece members 4 and 6 to the initial position. By doing so, each time the mold is opened, the piece members 4 and 6 can be always set to a predetermined initial position in the vertical and horizontal directions. There is.

Therefore, in the past, since the bridge members 24 and 26 were fixed to the plate members 23 and 25, if the mounting positions of the bridge members 24 and 26 with respect to the plate members 23 and 25 are once displaced, the mold At the time of tightening, the upper piece member 24 and the lower piece member 26 are not properly matched, and the product die surface 31a of the upper piece member 24 and the product die surface 31b of the lower piece member 26 are vertically and horizontally aligned. Although it was semi-permanently displaced, in the above-mentioned molding die, the initial positions of the piece members 4 and 6 are automatically set every time the mold is opened. Therefore, even if the piece members 4 and 6 are misaligned for some reason, if the cause of the deviation is removed, the piece members 4 and 6 will be positioned at proper molding positions from the next molding operation. Become.

As a result, when the mold is clamped, the upper piece member 4 and the lower piece member 6 are satisfactorily matched, so that the product die surface 11a of the upper piece member 4 and the product die of the lower piece member 6 are made. The occurrence of relative displacement with the surface 11b is prevented, whereby the cavity 11 is properly formed and the accuracy of the molding die is improved.

Further, in the above-mentioned molding die, the plate members 3 and 5 do not warp.

That is, since the bridge members 4 and 6 are attached to the plate members 3 and 5 while being held by the minute elastic forces of the elastic rings 9 and 10, it is likely that the bridge members are conventionally fitted with an interference fit. Compared to the above case, the influence of the fit is extremely small. Therefore, it is possible to eliminate the warp of the plate members 3 and 5 due to the fit between the piece members 4 and 6 and the plate members 3 and 5. Has become.

[0068]

[Effect of device]

 As described above, according to this invention, it is possible to improve the positional accuracy of the mold during molding. That is, in the past, since the piece member forming the cavity was fixed to the plate member by the spring pin to form the upper die and the lower die, the attachment position of the piece member may be displaced in the horizontal direction. However, in this invention, since the elastic ring is provided between the bridge member and the plate member, the elastic force of the elastic ring holds the bridge member around the entire circumference thereof. It is possible to prevent the mounting position of the piece member from being displaced in the horizontal direction and to always position the piece member at a predetermined position.

Further, in the related art, once the piece member is fixed to the plate member, once the displacement occurs in the upward and downward directions, the displacement cannot be eliminated semipermanently. However, in this invention, a piece member having a pressing portion that cannot be inserted into the insertion hole is inserted into the insertion hole of the plate member so that the elastic ring can move up and down. Since the pressing portion of the piece member is urged by, even if the piece member is displaced in the vertical direction during mold clamping, the piece members move in the direction in which they are separated from each other by the elastic force of the elastic ring when the mold is opened. The piece member can be set to the initial position.

Therefore, if the cause of the displacement of the piece member is removed, the piece member is automatically restored to the predetermined position when the mold is opened, and the displacement of the piece member is corrected from the next molding. As a result, the positional accuracy of the molding die can be sufficiently ensured, and there is an effect that a good product can always be obtained.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a molding die according to the present invention.

FIG. 2 is a diagram showing the upper mold in FIG.

FIG. 3 is a view showing an example of an elastic ring used in the mold according to the present invention.

FIG. 4 is a view showing a mold clamping state of the molding die according to the present invention.

FIG. 5 is a view showing a state in which a piece member is displaced when the mold according to the present invention is clamped.

FIG. 6 is a view showing a mold opening (unpressurized) state of the molding die according to the present invention.

FIG. 7 is a diagram showing a conventional example.

FIG. 8 is a diagram showing an arrow A in FIG.

FIG. 9 is an enlarged view of a main part of the forming die shown in FIG. 8, showing an attached state of a piece member.

FIG. 10 is a view showing a state in which a piece member is displaced in a conventional molding die.

[Explanation of symbols]

 1, 21 ... upper mold 2, 22 ... lower mold 3, 23 ... upper plate members 3a, 23a, 5a, 25a ... insertion holes 3b, 5b ... groove portions 3c, 5c ... step portions 4, 24 ... ... Upper piece member 5, 25 ... Lower plate member 6, 26 ... Lower piece member 7, 8 ... Pressing portion 9, 10 ... Elastic ring 11, 31 ... Cavity 11a, 11b, 31a, 31b ... Product Mold surface 12, 13 ...... Press board 14 ...... Foreign material 34 ...... Spring pin

Claims (1)

[Scope of utility model registration request] 1. A mold comprising an upper mold (1) and a lower mold (2) which can be brought into contact with and separated from each other, wherein the upper mold (1) is
An upper plate member (3) having an insertion hole (3a) and a pressing portion (7) formed in a size that cannot be inserted into the insertion hole (3a).
And an upper piece member (4) which is inserted into the insertion hole (3a) of the upper plate member (3) and the upper plate member (3) while being in contact with the pressing portion (7). The upper piece member (4) is provided between the upper piece member (4) and the upper piece member (4) so as to be movable in the vertical direction and the horizontal direction, and the pressing portion (7) is normally placed. ) Is formed by an elastic ring (9) that holds the upper piece member (4) in a protruding state,
The lower mold (2) has a lower plate member (5) having an insertion hole (5a) and a pressing portion (8) formed in a size that cannot be inserted into the insertion hole (5a). A lower piece member (6) which is inserted into the insertion hole (5a) of the plate member (5) and forms a cavity (11) in cooperation with the upper piece member (4) of the upper mold (1); The lower piece member (6) is provided between the lower plate member (5) and the lower piece member (6) while being in contact with the pressing portion (8), and the lower piece member (6) serves as the lower plate member (5). In addition to being able to move vertically and horizontally,
The pressing portion (8) is normally formed with an elastic ring (10) that holds the pressing piece (8) in a state of protruding from the lower piece member (6), so that the upper piece member of the upper die (1) is clamped during mold clamping. (4) and the lower piece member (6) of the lower mold (2) approach each other against the elastic force of the elastic rings (9, 10) to form a cavity (11), and the mold opening At the same time, the upper piece member (4) of the upper die (1) and the lower piece member (6) of the lower die (2) move in a direction in which they are separated from each other by the elastic force of the elastic rings (9, 10). Then, a molding die characterized by being restored to the initial position.