JP5550915B2 - Mold release method and apparatus - Google Patents

Description

  The present invention relates to a mold release method and apparatus for releasing a molded product having a recess and a large mold release resistance.

As a method for releasing a molded product having a high release resistance, for example, as described in Patent Document 1, a protruding portion (extrusion pin) that can move forward and backward toward the moving mold is provided in the fixed mold, and the mold is opened. In this case, a method is known in which the tip of the push pin protrudes outside the fixed mold and the fixed mold side is released.

Japanese Patent Laid-Open No. 9-262879

However, the invention described in Patent Document 1 has a problem that it is difficult to smoothly release a molded product having a recess.

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is to release a molded product having a recess with a simple configuration. A method and apparatus are to be provided.

In order to solve the above-mentioned problem, the invention according to claim 1 is a method of releasing a molded product having a concave portion inside, an extrusion step of extruding an extrusion pin formed with the concave portion, and an extrusion extruded in the extrusion step. A drawing step of pulling out the pin from the concave portion, and the molded product has three undercut shapes, and after releasing at least two undercut portions, the remaining one undercut portion is removed from the extrusion step and the drawing step. The mold is released by the process .

According to a third aspect of the present invention, there is provided an apparatus for releasing a molded product having a concave portion inside, an extrusion pin disposed in a nest and molding the concave portion, and the extrusion pin disposed in a mold body. When the insert moves, the push pin is pushed by the push block to move forward, and when the insert moves further, the push pin comes off the push block. Retreat and come out of the recess.

Moreover, the elastic member which urges | biases the said extrusion pin to the direction opposite to a protrusion direction, and the stopper which contact | abuts when the said extrusion pin remove | deviates from the said extrusion block can be provided.

According to the invention which concerns on Claim 1, while being able to shape | mold the cylindrical recessed part which exists in the inner side of a molded article, the molded article can be released smoothly.

In addition, even when the three sides of the molded product are undercut, if the undercut part of at least two sides is released and then the remaining undercut part of the other side is released by an extrusion process and a drawing process, the molded product can be made smooth. Can be released.

According to the invention which concerns on Claim 3, a molded article can be smoothly mold-released by operation | movement of an extrusion pin and an extrusion block.

Further, the protruding amount of the extrusion pin can be adjusted by the elastic member and the stopper, and the molded product can be released smoothly.

It is explanatory drawing of a molded product, (a) is a plan view, (b) is a rear view It is explanatory drawing of the shaping | molding apparatus provided with the mold release apparatus which concerns on this invention, (a) is sectional drawing, (b) is a side view. Sectional drawing of the mold release apparatus which concerns on this invention It is operation | movement explanatory drawing of the mold release apparatus which concerns on this invention, (a) is a side view of a shaping | molding apparatus, (b) is the sectional view on the AA line of (a), (c) is sectional drawing of a mold release apparatus. It is operation | movement explanatory drawing of the mold release apparatus which concerns on this invention, (a) is a side view of a shaping | molding apparatus, (b) is the sectional view on the AA line of (a), (c) is sectional drawing of a mold release apparatus. It is operation | movement explanatory drawing of the mold release apparatus which concerns on this invention, (a) is a side view of a shaping | molding apparatus, (b) is the sectional view on the AA line of (a), (c) is sectional drawing of a mold release apparatus. It is operation | movement explanatory drawing of the mold release apparatus which concerns on this invention, (a) is a side view of a shaping | molding apparatus, (b) is the sectional view on the AA line of (a).

  Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a molded product 1 to be released by a release apparatus according to the present invention is, for example, a rear cowl of a motorcycle, and has left and right undercut portions 1a and 1b and a tail portion undercut portion 1c. ing. A taillight mounting boss 2 made of a recess is formed in the undercut portion 1c of the tail portion, and is used in a form of being inserted into a taillight mounting stay.

  As shown in FIG. 2, the molding apparatus for molding such a molded product 1 includes an upper mold 3, a lower mold 4, left and right outer slide cores 5a and 5b that slide left and right, and left and right undercut portions 1a. , 1b are divided into left and right inclined cores 6a, 6b, 6c, 6d, and a direct-pressing core 7 for forming an undercut portion 1c of the tail portion. In FIG. 2B, the upper mold 3 is omitted.

  The inclined cores 6 a, 6 b, 6 c, 6 d are moved up and down by rods 9 a, 9 b, 9 c, 9 d, 9 e, 9 f connected to the push plate 8 disposed below the lower mold 4. The left inclined cores 6a and 6b and the right inclined cores 6c and 6d are moved away from each other in the left-right direction by a driving means (not shown). The push plate 8 is connected to a tail portion direct push rod 11 that moves the direct push core 7 up and down. The push plate 8 is moved up and down by a hydraulic cylinder (not shown).

As shown in FIG. 3, the direct pressing core 7 is provided with an extrusion pin 12 that releases the molded product 1 and also functions to mold the taillight mounting boss 2. The base end portion 13 of the extrusion pin 12 is formed by a bottom portion 13a at the outer edge portion, an inclined portion 13b, and a top portion 13c at the center portion.

The lower mold 4 adjacent to the direct-pressing core 7 is provided with an extrusion block 14 that pushes the proximal end portion 13 of the extrusion pin 12 and pushes the extrusion pin 12 in the protruding direction (mold release direction). A protrusion 14 a is formed on a part of the surface of the extrusion block 14 facing the base end portion 13 of the extrusion pin 12.

Further, the direct-pressing core 7 has an elastic member 15 that urges the extrusion pin 12 in the direction opposite to the protruding direction, and a flange portion 12a of the extrusion pin 12 when the base end portion 13 of the extrusion pin 12 is disengaged from the extrusion block 14. A stopper 16 is provided that moves and contacts with the pressing force of the elastic member 15.

  After the molding, when the direct pressing core 7 is raised, the extrusion pin 12 for molding the taillight mounting boss 2 is pushed by the extrusion block 14 and advances in the protruding direction. Further, when the direct-pressing core 7 is raised, the base end portion 13 of the push pin 12 is disengaged from the push block 14, the push pin 12 is retracted by the pressing force of the elastic member 15, and the flange portion 12 a comes into contact with the stopper 16. A predetermined amount is extracted from the light mounting boss 2.

In this way, by removing a predetermined amount of the push pin 12 from the tail light mounting boss 2, release resistance when the tail light mounting boss 2 is released is reduced, and the tail light mounting boss 2 is removed from the push pin 12. Can be released smoothly.

  The operation of the mold release apparatus and the mold release method according to the present invention configured as described above will be described. First, as shown in FIGS. 4A and 4B, the upper die 3 is raised after molding, and the left and right outer slide cores 5a and 5b are moved backward to complete the mold opening. At this time, as shown in FIG. 4C, the top portion 13b of the base end portion 13 of the extrusion pin 12 is in contact with the lower mold 4, and the bottom portion 13a of the base end portion 13 of the extrusion pin 12 is the extrusion block. 14 projecting portions 14a. This state is the original position of the push pin 12 on which the taillight mounting boss 2 can be formed.

Next, as shown in FIGS. 5A and 5B, the direct-pressing core 7 and the left and right inclined cores 6a, 6b, 6c, and 6d are raised by driving the hydraulic cylinder (for example, the push plate 8 is raised by about 5 mm). ). Then, as shown in FIG. 5C, the base end portion 13 of the push pin 12 rides on the protrusion 14 a of the push block 14, and the top portion 13 c passes through the inclined portion 13 b from the bottom portion 13 a of the base end portion 13. Abuts against the protrusion 14a.

Then, the push pin 12 is pushed out in the protruding direction to release the molded product 1 (for example, when the push plate 8 is raised about 5 mm, it is pushed out about 0.5 mm). As shown in FIG. 5 (a), the base end portion 13 of the extrusion pin 12 rides on the protrusion 14a of the extrusion block 14, and reaches the top portion 13c from the bottom portion 13a of the base end portion 13 through the inclined surface 13b. The left and right undercut portions 1a, 1b are released from the mold, and then the push pin 12 is pushed out to release the undercut portion 1c of the tail portion where the taillight mounting boss 2 is formed.

  The timing of releasing the left and right undercut portions 1a and 1b and the timing of releasing the push pin 12 and releasing the undercut portion 1c of the tail portion for forming the tail light mounting boss 2 are as follows. It is possible to adjust according to the mounting position of the screw and the shape of the base end portion 13 of the push pin 12.

  Next, as shown in FIGS. 6A and 6B, the push plate 8 is raised by driving the hydraulic cylinder, and the direct-press core 7 and the left and right inclined cores 6a, 6b, 6c, and 6d are further raised. Then, as shown in FIG. 6C, the base end portion 13 of the push-out pin 12 is disengaged from the protrusion 14a of the push-out block 14, and the push-out pin 12 is retracted by the pressing force of the elastic member 15, so that the flange portion 12a is stopped by the stopper. 16 and comes out of the taillight mounting boss 2 by a predetermined amount (for example, returns about 1 mm).

  Next, as shown in FIGS. 7A and 7B, the push plate 8 is raised by the drive of the hydraulic cylinder so that the direct-pressing core 7 and the left and right inclined cores 6a, 6b, 6c, 6d are in predetermined positions (stroke end). ). Then, the take-out machine (not shown) descends, and the tail part and the left and right sides of the molded product 1 are sucked by the suction disk provided in the take-out machine. At this time, since the pushing pin 12 has been removed from the taillight mounting boss 2 by a predetermined amount, the mold release resistance is reduced, and the takeout machine can smoothly take out the molded product 1 from the molding apparatus.

Next, after the take-out machine takes out the molded product 1 from the molding apparatus, the molding apparatus returns to the state before molding, for example, the extrusion pin 12 returns to the original position where the taillight mounting boss 2 can be molded.

  In the embodiment of the present invention, the case where the molds 3... Are installed so that the mold release direction is vertical is described. However, the mold 3 is rotated 90 degrees so that the mold release direction becomes horizontal. The molds 3 ... may be installed in

ADVANTAGE OF THE INVENTION According to this invention, while being able to shape | mold the cylindrical recessed part inside a molded article, the mold release method and apparatus which can release the molded article smoothly can be provided. In particular, this is an effective means for smoothly releasing a molded product having a cylindrical recess in the undercut portion.

DESCRIPTION OF SYMBOLS 1 ... Molded product, 1a, 1b, 1c ... Undercut part, 2 ... Tail light mounting boss, 3 ... Upper die, 4 ... Lower die, 5a, 5b ... Outer slide core, 6a, 6b, 6c, 6d ... Inclination Core: 7: Directly pressed core, 8: Push plate, 9a, 9b, 9c, 9d, 9e, 9f ... Rod, 11: Tail direct push rod, 12: Extrusion pin, 12a ... Gutter, 13 ... Base end , 13a ... bottom, 13b ... inclined portion, 13c ... top, 14 ... extruded block, 14a ... projection, 15 ... elastic member, 16 ... stopper.

Claims (3)

The molded article having a concave inside there is provided a method for releasing comprises an extrusion step of extruding the extrusion pin molding the recess, and a drawing step of pulling out the extrusion pin extruded in the extrusion step from said recess, said forming The product has a three-sided undercut shape, and after releasing at least two undercut portions, the remaining one undercut portion is released by the extrusion step and the drawing step .   An apparatus for releasing a molded product having a concave portion on the inner side from an extrusion pin disposed in a nest and molding the concave portion, and an extrusion block disposed in a mold body and extruding the extrusion pin in a protruding direction When the insert moves, the push pin is pushed by the push block and moves forward in the protruding direction, and when the insert moves further, the push pin comes off from the push block and moves backward from the recess. A mold release device. 3. The mold release apparatus according to claim 2 , further comprising: an elastic member that urges the extrusion pin in a direction opposite to a protruding direction; and a stopper that abuts when the extrusion pin comes off the extrusion block. apparatus.

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