JPH0357306Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a press mold with a locating pin.

[Prior Art] As a conventional press mold with a locating pin, the one shown in FIG. 4 is in practical use. That is,
This press mold is composed of a lower mold 1 and an upper mold 2. The lower mold 1 is fixed to a pedestal (not shown), and the upper mold 2 is fixed to a drive device (not shown) to be driven in the vertical direction. It's getting old. Said lower mold 1
A lower pressing surface 3 is provided on the upper surface of the holder, and a positioning hole 4 is formed in the lower pressing surface 3.

On the other hand, an upper press surface 5 having a shape matching the lower press surface 3 is provided on the lower surface of the upper mold 2, and the upper press surface 5 has the positioning holes 4.
A locate pin 6 is provided protrudingly at a position facing the. Further, the upper mold 2 is provided with a knockout pin 7 that can freely come out and retract from the upper press surface 5, and the knockout pin 7 is urged by a spring 8 to protrude from the upper press surface 5. There is.

In this configuration, when pressing the workpiece W, a through hole H is formed in the workpiece W in advance. Then, with the lower mold 1 and the upper mold 2 separated from each other in an open mold state, the workpiece W is placed on the lower press surface 3, and the through hole H and the positioning hole 4 are aligned. When moving from this mold opening state to a pressing process in which the upper mold 2 is lowered, the locating pin 6 is inserted through the through hole H and the positioning hole 4, and the workpiece W is thereby positioned.

Further, when the pressing process is further continued, the tip of the knockout pin 7 comes into contact with the surface of the workpiece W, and the knockout pin 7 retreats into the upper die 2 against the spring 8, and the workpiece W. is pressed between the lower press surface 3 and the upper press surface 5 to complete the press forming. After the press forming is completed, when a mold opening process is performed in which the upper mold 2 is moved upward and the lower mold 1 and the upper mold 2 are moved relative to each other in a direction in which they are separated from each other, the biasing force of the spring 8 causes the notch to open. The out pin 7 operates to protrude. Therefore, when the press forming is completed, the workpiece W pressed onto the upper press surface 5
is pressed by the knock-out pin 7, and can perform knock-out to remove the press-formed workpiece W from the upper press surface 5.

[Problems to be solved by the invention] However, this conventional press mold has the following problems.

Since not only the locate pin 6 but also the knockout pin 7 must be arranged on the upper mold 2, when the upper press surface 5 of the upper mold 2 is small, such as when pressing a small workpiece W, Both pins 6 and 7 cannot be arranged side by side, which limits the size of the workpiece to be machined.

The deeper the drawing during press forming, the longer the overall length of the locating pin 6 becomes. However, if the overall length of the locating pin 6 is increased, the rigidity against bending and shearing acting on the locating pin 6 during press forming decreases. Therefore, in order to ensure sufficient rigidity, it is necessary to increase the diameter of the locating pin 6, and as a result, it is also necessary to increase the diameter of the through hole H formed in advance in the workpiece W, which reduces the strength of the workpiece W. will decrease.

The present invention has been made in view of these conventional problems, and aims to provide a press die with a locate pin that eliminates the need for a knockout pin and reduces the diameter of the through hole formed in the workpiece. This is the purpose.

[Means for solving the problems] In order to solve the above problems, the present invention has the following features:
A positioning hole is provided on the pressing surface of the lower mold, and a locating pin is provided protruding on the pressing surface of the upper mold, so that the pressing surface of the lower mold is placed in an open state where the pressing mold surfaces of the lower mold and the upper mold are separated. A workpiece is placed on the mold, and in a pressing process in which the lower mold and the upper mold are relatively moved in a direction in which they approach each other from this mold open state, a locate pin is inserted into the through hole provided in the workpiece and the positioning hole. The positioned workpiece is then pressed between the press surfaces of the lower die and the upper die to complete the press forming, and the lower die and the upper die are separated in the mold opening process after the press forming is completed. In a press mold that is moved relative to the mold in a direction in which they are separated from each other, a small diameter portion that can be inserted into the through hole and the positioning hole is provided at the distal end of the locating pin, and the through hole is provided on the base end side of the small diameter portion. and the positioning hole, and a receiving hole into which the large diameter portion can be inserted is provided in the press surface of the upper mold, and the large diameter portion is slidably supported in the receiving hole. At the same time, a biasing means for biasing the locating pin to project the large diameter portion out of the receiving hole is provided, and the biasing means is provided with a biasing device that urges the locating pin to project the large diameter portion out of the receiving hole, and the biasing device includes a biasing device that presses the large diameter portion after the end surface of the large diameter portion comes into contact with the workpiece in the pressing step. A spring force that allows the large-diameter portion to move into the receiving hole due to the reaction of the reaction force, and also presses the end surface against the workpiece in the mold opening step and causes the workpiece to separate from the pressing surface of the upper mold. is set.

[Operation] In the mold opening state, the locating pin is biased by the biasing means to maintain the large diameter portion protruding outside the receiving hole. When moving from this mold open state to the pressing process in which the lower mold and upper mold are moved in a direction in which the lower mold and upper mold are brought closer together, the small diameter part of the locate pin is inserted through the through hole provided in the workpiece and the positioning hole provided in the lower mold. The workpiece is thereby positioned. When the pressing process is further continued, the end surface of the large diameter portion comes into contact with the circumference of the through hole of the workpiece, and the reaction generated by this causes the large diameter portion to move into and out of the receiving hole against the biasing means. do.
Furthermore, at the time when the workpiece is pressed between the press surfaces of the lower die and the upper die to complete press forming,
The large diameter portion is recessed into the receiving hole, allowing the press forming to be completed without any trouble, and upon completion of the press forming, the workpiece is crimped onto the pressing surface of the upper die.

After this press forming is completed, when the mold opening step is started, the lower die and the upper die move relative to each other in the direction of separating from each other, and the locate pin presses the end face of the large diameter part to the workpiece that has been press formed. Then, the workpiece is removed from the press surface of the upper die.

[Example] An example of the present invention will be described below with reference to the drawings. That is, as shown in FIG. 1, this press mold is composed of a lower mold 1 and an upper mold 2. The lower mold 1 is fixed to a pedestal (not shown), and the upper mold 2 is connected to a drive device (not shown). It is fixed to and can be driven in the vertical direction. Said lower mold 1
A lower pressing surface 3 is provided on the upper surface of the holder, and a positioning hole 4 is formed in the lower pressing surface 3. On the other hand, an upper press surface 5 having a shape matching the lower press surface 3 is formed on the lower surface of the upper mold 2, and a receiving hole 9 is provided.
The receiving hole 9 is a small diameter hole 10 provided on the upper press surface 5 on the same axis as the positioning hole 4.
and a large diameter hole 11 connected to the small diameter hole 10. A bush 12 is fitted into the small diameter hole 10, and the end opening of the large diameter hole 11 is closed by a lid 18.

On the other hand, the locate pin 13 has a small diameter part 14 provided at the tip, a large diameter part 15 provided on the proximal end side of the small diameter part 14, and a stopper 16 provided at the end of the large diameter part 15. It consists of
The small diameter portion 14 has a diameter that can be inserted into the positioning hole 4 and a through hole H that is formed in advance in the workpiece W and has approximately the same diameter as the positioning hole 4, and
5 has a diameter that cannot be inserted into the positioning hole 4 and the through hole H, and has an end surface 1 at the base end of the small diameter portion 14.
7.

This locate pin 13 is supported by the receiving hole 9 with the large diameter portion 15 slidably inserted into the bush 12 and the stopper 16 disposed within the large diameter hole 11. This ensures that the locate pin 13 is slidable in the axial direction. The receiving hole 9 consisting of the small diameter hole 10 and the large diameter hole 11 has a length that is longer than the length in which the large diameter portion 15 can be inserted as the locating pin 13 slides,
A compression spring 19 is inserted between the stopper 17 and the lid 18 as a biasing means.

The compression spring 19 presses the stopper 17 against the end wall of the large diameter hole 11 as shown in FIG.
The large diameter portion 11 has a spring force capable of biasing the locate pin 13 so as to protrude outside the small diameter hole 11.
Furthermore, this compression spring 19 is caused to move into the large diameter hole 11 of the large diameter part 14 due to a reaction after the end surface 17 of the large diameter part 11 comes into contact with the workpiece W in the pressing process shown in FIG. The spring force is such that the spring force is sufficient to allow the retracting movement of A spring force is set that can press the workpiece W into contact with the workpiece W and remove the workpiece W from the upper press surface 5. In other words, the compression spring 19 has a spring force set to be approximately the same as that of the spring 8 which urges the knockout pin 7, which has already been described in the fourth section, to protrude.

In this embodiment having the above configuration, when the mold is opened, the lower mold 1 and the upper mold 2 are separated from each other by more than shown in FIG. 4 is not inserted. Then, in this mold open state, the work W is placed on the lower press surface 5, and the through holes H are aligned with the positioning holes 4. After that,
The pressing process is started and the upper mold 2 is lowered toward the lower mold 1.

Then, as shown in FIG. 1, the small diameter portion 14 of the locate pin 13 is inserted through the through hole H and the positioning hole 4, thereby positioning the workpiece W. When the pressing process is further continued, the end surface 17 of the large diameter portion 15 is formed in the through hole H in the workpiece W.
The locating pin 13 comes into contact with the circumferential portion of the locating pin 13, and due to the reaction generated by this, the locating pin 13 moves back and forth into the large diameter hole 11 against the compression spring 19.

Then, as shown in FIG. 3, the workpiece W
When the press forming is completed by pressing between the press surfaces 3 and 5 of the lower die 1 and the upper die 2, the large diameter portion 15 is recessed into the receiving hole 9, and the press forming can be carried out without any trouble. At this time, the workpiece W is pressed against the upper press surface 5.

After completing this press forming, when the upper die 2 is moved upward in the mold opening process, the locate pin 13 presses the end surface 17 against the workpiece W that has been press-formed, and moves the workpiece W into the upper part. It is separated from the press surface 5. Therefore, without providing the knockout pin 7 (see FIG. 4) as in the conventional method, the knockout is performed to separate the workpiece W crimped to the upper press surface 5 from the upper press surface 5 when the press forming is completed. be able to. Therefore, if only the locate pin 13 is provided on the upper mold 2, there is no need to provide the knockout pin 7, and the upper press surface 5 of the upper mold 2 is small as in the case of pressing a small workpiece W. Even in cases where the work W can be positioned, the work W can be removed from the upper mold 2 after press forming is completed, and
It is possible to eliminate the inconvenience that the size of the workpiece to be processed is limited.

Furthermore, the small diameter portion 1 is inserted into the through hole H.
4, the total length of the locate pin 13 becomes longer when the drawing is deep during press forming, and accordingly, in order to ensure sufficient rigidity against bending and shearing that acts on the locate pin 6 during press forming, Even if the large diameter portion 11 is made larger in diameter, the through hole H
There is no need to make the diameter even larger. Therefore, the disadvantage that the strength of the workpiece W is reduced due to the large diameter of the through hole H is eliminated, and the strength of the workpiece W can be ensured even though the drawing is deep.

[Effects of the Invention] As explained above, in the present invention, it is possible to perform workpiece positioning and knockout to remove the press-formed workpiece from the press surface of the upper die using only the locating pin. Therefore, there is no need to separately provide a knock-out pin on the upper mold, and press molding that involves positioning and knock-out of the workpiece can be performed by providing only a locate pin. Therefore, even when the pressing surface of the upper mold is small, such as when press-forming a small workpiece, it is possible to position and knock out the workpiece, which is an inconvenience that limits the size of the workpiece that can be processed. can be resolved.

Further, the large diameter part may be any large diameter as long as it cannot be inserted into the positioning hole provided in the lower die and the through hole provided in the workpiece. Since it is only the small diameter portion provided at the tip of the locate pin, it is not necessary to make the through hole large in diameter no matter how large the large diameter portion is made. Therefore, in order to increase the overall length of the locating pin when the drawing is deep during press forming, and to ensure the rigidity of the locating pin during press forming, even if the large diameter portion is further increased in diameter, the through hole may be made smaller in diameter. can do. Therefore, the disadvantage that the strength of the workpiece decreases due to the large diameter of the through hole is eliminated, and it is possible to ensure the strength of the workpiece with a deep drawing.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a state in which the mold has been opened to the press-forming process in an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the state before press-forming is completed in the press-forming process of the same embodiment. FIG. 3 is a sectional view showing the state when press forming of the same embodiment is completed, and FIG. 4 is a sectional view showing the state when press forming is completed in the conventional press die. 1...Lower die, 2...Upper die, 3...(Lower) press surface, 4...Positioning hole, 5...(Upper) press surface, 9...Receiving hole, 13...Locate pin, 14
...Small diameter part, 15...Large diameter part, 17... End face, 1
9... Compression spring (biasing means).

Claims (1)

[Claims for Utility Model Registration] A positioning hole is provided on the pressing surface of the lower mold, and a locating pin is provided protruding from the pressing surface of the upper mold, so that the mold is in an open state in which the pressing mold surfaces of the lower mold and the upper mold are separated. A workpiece is placed on the pressing surface of the lower die, and in a press step in which the lower die and the upper die are relatively moved in a direction in which they approach each other from this mold open state, the through hole provided in the workpiece and the A locating pin is inserted into the positioning hole to position the workpiece, and the positioned workpiece is pressed between the press surfaces of the lower die and the upper die to complete press forming, and the die after the press forming is completed. In a press mold in which a lower mold and an upper mold are relatively moved in a direction in which they are separated from each other in an opening step, a small diameter portion that can be inserted into the through hole and the positioning hole is provided at the tip of the locating pin, and
A large diameter part that cannot be inserted into the through hole and the positioning hole is provided on the proximal end side of the small diameter part, and a receiving hole in which the large diameter part can be inserted is provided in the press surface of the upper mold,
The large-diameter portion is slidably supported in the receiving hole, and a biasing means is provided for urging the locating pin to project the large-diameter portion out of the receiving hole, and the biasing means is provided with a biasing device that supports the large-diameter portion in the pressing step. The reaction after the end face of the large diameter part contacts the workpiece allows the large diameter part to move into the receiving hole, and the end face is brought into pressure contact with the workpiece in the mold opening step. A press die with a locating pin, characterized in that a spring force is set that allows the workpiece to be separated from the press surface of the upper die.