JP4843448B2 - Mold release method for blow molded products - Google Patents

Description

  The present invention relates to a blow-molded product release method in which a mold is closed, a blank material is superplastically formed (blow-molded) with fluid pressure, and then the mold is opened to release the blow-molded product.

Blow molding product release method is known in which the mold is closed, the blank material is blow molded with fluid pressure, and then the mold is opened to release the blow molded product that is in close contact with the mold from the mold. (For example, refer to Patent Document 1).
Japanese Patent Laying-Open No. 2005-297048 (FIG. 5B)

Patent document 1 is demonstrated based on the following figure.
FIG. 12 is a diagram for explaining the basic structure of the prior art. A blow molding die 101 includes a blow mold 102 as a lower mold, a mold 103 as an upper mold, and a rod around the mold 103. A blank holder 105 provided via 104 and 104 is a main configuration.

  Then, the blank material 106 is sandwiched between the blow mold 102 and the mold 103, the blank material 106 is pressed by the blank holder 105, and the blank material 106 is blow-molded into the mold 103 by the pressure of the fluid blown from the blow mold 102. .

  After blow molding, the molding die 103 is moved in the mold opening direction while holding the periphery of the blow molded product 107 with the blank holder 105 provided around the molding die 103, and the molding surface of the molding die 103 from the blow molded product 107 is moved. 103 a is released, and then the blank holder 105 is released from the blow molded product 107. That is, the mold 103 and the blank holder 105 are released at different timings.

  Since the mold 103 and the blank holder 105 are released from the blow-molded product 107 at different timings, a large force is not applied to the blow-molded product 107 as compared with the case of releasing from the same timing. Since a large force is not applied to the blow molded product 107, deformation of the blow molded product 107 can be suppressed when releasing the mold.

  However, depending on the shape and material of the molding surface 103a, the blow molded product 107 may adhere to the molding surface 103a with a strong force. When firmly adhered, a large force is applied to the blow molded product 107 when the molding surface 103a is released from the blow molded product 107. When a large force is applied, the blow molded product 107 may be deformed, and there is room for improvement.

  It is an object of the present invention to provide a technique capable of suppressing deformation of a blow molded product so that a large force is not applied to the blow molded product when the mold is released from the blow molded product.

  According to the first aspect of the present invention, a molding die having a molding surface, and this molding die are combined with a blowing die having a fluid blowing port, a blank material is sandwiched between the blowing die and the molding die, and blown from the blowing die. In the mold release method of the blow molded product, the blank material is blow-molded into the mold by the fluid pressure, the blank is blow-molded, the mold is moved in the mold opening direction, and the mold is released from the blow-molded product. The mold is composed of divided parts that are divided into three or more parts, and these divided parts are separated from the blow-molded product at different timings.

The invention according to claim 2 is characterized in that a seal bead portion is provided in one of the divided portions that first move in the mold opening direction by mold opening after molding.

  In the invention which concerns on Claim 3, a division | segmentation part is arrange | positioned at the product shape peripheral part arrange | positioned on the outer side of this product shape part, the product shape part which determines a product shape, and this product shape peripheral part. And an outer peripheral portion.

  In the invention according to claim 1, the molding die is composed of divided parts that are divided into three or more parts, and these divided parts are separated from the blow molded product at different timings. Can be small. At the same time, since the area to be released becomes small, it is possible to prevent a large force from being applied to the blow molded product when releasing. Since no great force is applied to the blow molded product, deformation of the blow molded product can be suppressed.

  If the number of divisions is increased and the area that is released from the blow molded product at a time is reduced, the force applied to the blow molded product at the time of mold release is further reduced, and deformation of the blow molded product can be further suppressed. it can.

In the invention according to claim 2, the seal bead portion is provided in one of the divided portions that move in the mold opening direction. The seal bead portion is a divided portion in which the blow molded product is strongly adhered to the mold, and can be said to be a portion that is difficult to release.

  In this respect, in the present invention, in the mold release step, first, the divided part that is difficult to release is moved in the mold opening direction to release the mold, so both sides of the divided part that is difficult to release are pressed by the product shape part and the outer peripheral part. However, by releasing the mold, it is possible to prevent a large force from being applied to the blow-molded product when releasing the part that is difficult to release. By separating the part that is difficult to release first from the blow molded product, it becomes difficult to apply a large force to the blow molded product, and deformation of the blow molded product can be further suppressed.

  In the invention which concerns on Claim 3, a division | segmentation part is arrange | positioned at the product shape peripheral part arrange | positioned on the outer side of this product shape part, the product shape part which determines a product shape, and this product shape peripheral part. Therefore, the mold structure can be prevented from becoming complicated and the mold cost can be reduced as compared with the case where the divided part is divided into four or more parts.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view of a blow molded product molded with a blow molding die according to the present invention. The blow molded product 11 includes a product part 12 and a peripheral part 13 continuous around the product part 12. . The peripheral portion 13 includes a bead shape portion 14 and a plate pressing portion 15 and is removed in a subsequent trimming step.
The boundary between the product part 12 and the peripheral part 13 will be described later.

  The blow molded product 11 is obtained by molding a plate-shaped blank made of an aluminum alloy, and in this embodiment, an example of an automotive part is shown. Hereinafter, a detailed structure of a blow molding mold (also referred to as a “mold”) that molds a blank material into the blow molded article 11 and releases the blank material will be described.

  FIG. 2 is a plan view of a blow molding die according to the present invention, and a molding surface 23 is provided on the lower surface of the upper die 21. In the figure, 24... (... indicates a plurality. The same applies hereinafter) are ribs provided around the mold in order to convey the blow molding mold.

  3 is a cross-sectional view taken along the line 3-3 of FIG. 2, and the blow molding die 25 includes a blow die 28 as the lower die 22 and a molding die 27 as the upper die 21. The blowing mold 28 has a fluid blowing port 31.

  And after setting the blank 29 which heated up to predetermined temperature between the blowing type | mold 28 and the shaping | molding die 27, the blowing type | mold 28 and the shaping | molding die 27 are match | combined and the shaping | molding die from the fluid blowing port 31 with which the blowing type | mold 28 was equipped. Compressed air is supplied to 27, and the blank material 29 is applied to the molding surface 23 provided in the molding die 27 to be deformed, thereby producing a blow molded article 11 having a predetermined product shape.

  The forming die 27 is attached to a slide 32 provided in the press machine via clamp devices 33, 33, and the blowing die 28 is attached to a base 34 provided in the press machine. In the figure, the position of the slide 32 is the position of the bottom dead center of the press machine.

  The mold 27 includes a product shape portion 36 that determines the product shape, a product shape peripheral portion 37 that is disposed outside the product shape portion 36, and an outer peripheral portion 38 that is disposed outside the product shape peripheral portion 37. This is a type having a dividing unit 40 divided into three.

  In this embodiment, the molding die 27 has a three-part structure, but the molding die 27 may be configured as a divided part that is divided into four or more parts. For example, the mold 27 may have a four-part structure or a five-part structure.

  The product shape peripheral portion 37 is attached to the slide 32 via clamp devices 33 and 33. A product shape portion 36 and an outer peripheral portion 38 are slidably attached to the product shape peripheral portion 37. The detailed structure is described below.

The product shape portion 36 has outer sliding portions 41 and 41 on the outer side in the vertical direction, and the product shape peripheral portion 37 has inner sliding portions 42 and 42 on the inner side in the vertical direction. And the inner sliding parts 42 and 42 are provided in the outer sliding parts 41 and 41 so that sliding is possible. Since the inner sliding portions 42, 42 are slidably provided on the outer sliding portions 41, 41, the product shape peripheral portion 37 can be slid with respect to the product shape portion 36.
Alternatively, the product shape portion 36 can be slid with respect to the product shape peripheral portion 37.

  The product shape peripheral portion 37 is provided in the horizontal direction and has driving surfaces 43 and 43 for driving the product shape portion 36 in the mold opening direction. The product shape portion 36 is provided in the horizontal direction and has a product shape periphery. The driven surfaces 44 and 44 driven by the portion 37 are provided. The driving surfaces 43 and 43 and the driven surfaces 44 and 44 are surfaces facing each other, and gaps 45 and 45 are formed between these surfaces. The product shape portion 36 is not driven by the gaps 45 and 45 until the product shape peripheral portion 37 attached to the slide 32 moves by the length h in the mold opening direction, and from that position in the mold opening direction. When moved, the drive surfaces 43, 43 contact the driven surfaces 44, 44, and thereafter, the product shape portion 36 drives the product shape portion 36 and moves together with the product shape peripheral portion 37.

The product shape peripheral part 37 has a groove part 48 for accommodating the outer peripheral part 38 on the lower surface 47 thereof. The outer peripheral portion 38 is accommodated in the groove portion 48.
The groove portion 48 has inner and outer side walls 51n and 51s on both sides thereof, and the outer peripheral portion 38 has inner and outer side surfaces 52n and 52s. The inner and outer side walls 52n and 52s are slidably provided on the inner and outer side walls 51n and 51s. Since the inner side surface 52n is slidably provided on the inner side wall 51n and the outer side surface 52s is slidably provided on the outer side wall 51s, the outer peripheral portion 38 is slid relative to the product shape peripheral portion 37. Can do.
At the bottom dead center, the blank 29 is pressed by the lower surface 47 of the product shape peripheral portion 37 and the upper surface 28a of the blow mold 28.

  Further, the product shape portion 36 is such that the upper surface 36u of the product shape portion 36 contacts the lower surface 32s of the slide 32 during molding, and the upper surface 36u of the product shape portion 36 is separated from the lower surface 32s of the slide 32 during mold release. Is provided.

Since the upper surface 36 u of the product shape portion 36 is not fixed to the lower surface 32 s of the slide 32, the product shape portion 36 normally descends due to its own weight, and the upper surface 36 u of the product shape portion 36 extends from the lower surface 32 s of the slide 32. Should be in a remote location. However, in the drawing, the position of the product shape portion 36 is at a position where the upper surface 36u of the product shape portion 36 contacts the lower surface 36s of the slide 32 at the time of molding.
The structure in which the upper surface 36u of the product-shaped portion 36 contacts the lower surface 32s of the slide 32 when the slide is at the bottom dead center will be described with reference to the next drawing.

FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 2, and a structure in which the upper surface 36u of the product shape portion 36 is held on the lower surface 32s of the slide 32 at the bottom dead center will be described.
A support member 56 is attached vertically downward from the product shape portion 36, and a lower end portion 56 b of the support member 56 is brought into contact with a seat portion 57 provided on the blow mold 28. Therefore, at the bottom dead center, the upper surface 36 u of the product shape portion 36 can be brought into contact with the lower surface 32 s of the slide 32. That is, by interposing the support member 56 between the product shape portion 36 and the blow mold 28, the upper surface 36u of the product shape portion 36 can be brought into contact with the lower surface 32s of the slide 32 at the bottom dead center.

  The support member 56 may be attached to the blow mold 28 instead of being attached to the product shape portion 36.

Returning to FIG. 3, the outer peripheral portion 38 is accommodated in a groove portion 48 provided in the product shape peripheral portion 37.
The outer peripheral portion 38 includes an inner side surface 52n and an outer side surface 52s that slide with the groove portion 48, a lower surface 38b that presses the blank material 29, and an upper surface 38a to which the stopper arm 64 is attached.

  The stopper arm 64 includes a flange portion 65 and a shaft portion 66 connected to the flange portion 65. Then, the shaft portion 66 is directed upward, the shaft portion 66 is directed downward, the shaft portion 66 is passed through the hole portion 67 formed in the product shape peripheral portion 37, and the lower end portion 66b of the shaft portion 66 is connected to the upper surface 38a of the outer peripheral portion 38. Secure to.

  When the slide 32 is raised, the flange portion 65 abuts against the stopper surface 68 provided on the product shape peripheral portion 37, thereby restricting the outer peripheral portion 38 from descending by a predetermined value H or more with respect to the product shape peripheral portion 37. be able to.

  The stopper arm 64 is a member interposed between the product shape peripheral portion 37 and the outer peripheral portion 38, and the outer peripheral portion until the product shape peripheral portion 37 starts to rise and reaches the length H of the shaft portion 66. The product-shaped peripheral portion 37 moves relative to the outer peripheral portion 38 with respect to 38. When the product shape peripheral portion 37 rises beyond the length H of the shaft portion 66, the flange portion 65 hits the stopper surface 68 of the product shape peripheral portion 37, and thereafter the outer peripheral portion 38 as the product shape peripheral portion 37 rises. Moves in the mold opening direction.

  In the figure, reference numeral 71 denotes a trim portion that is a boundary between the product portion 12 and the peripheral portion 13 that is a region outside the product. Of the blow molded product 11, the peripheral portion 13 is cut out from the product portion 12 in a trimming step that is a subsequent step.

  FIG. 5 is an enlarged view of 5 parts in FIG. 3. In the product shape peripheral part 37, the mold 25 is arranged so that the compressed air supplied from the fluid blowing port (reference numeral 31 in FIG. 3) does not leak outside the blank material 29. The seal bead portions 70a and 70b are provided to maintain the airtightness.

The seal bead portions 70a and 70b are formed so as to surround the outside of the product portion of the mold in order to seal the compressed air for molding.
In addition, arc beads 74 that restrict the flow of the blank material 29 at the time of molding are formed inside the seal bead portions 70a and 70b.
In addition, the outer peripheral portion 38 is provided with an inflow prevention bead 72 that strengthens the pressing force to the blow molded product 11 by the outer peripheral portion 38 when releasing the molded blow molded product 11 from the product shape portion. Yes.

  The seal bead portions 70a and 70b are provided on the two seal bead surfaces 69a and 69b formed on the upper surface 28a provided on the blow mold 28 and the product shape peripheral portion 37 so as to oppose these seal bead surfaces 69a and 69b. It is comprised with the board holding | maintenance part 73 which exists. At the bottom dead center, the interval tb between the seal bead surfaces 69 a and 69 b and the plate pressing portion 73 is set smaller than the plate thickness t of the blank material 29.

  The inflow prevention bead 72 includes a convex portion 75 having a circular arc shape formed on the upper surface 28a of the blow mold 28 and a concave portion 76 having a circular arc shape provided on the outer peripheral portion 38 so as to face the convex portion 75. . The inflow prevention bead 72 can prevent the blow molded product from flowing in the mold opening direction when the product shape peripheral portion 37 which is a part of the mold 27 is released from the blow molded product.

  FIG. 6 is a view for explaining a molding surface provided in the molding die according to the present invention. The molding die 27 is arranged on the product shape portion 36 for determining the product shape and on the outside of the product shape portion 36. This is a mold having a three-part structure comprising a product shape peripheral portion 37 and an outer peripheral portion 38 disposed outside the product shape peripheral portion 37. That is, the mold 27 is composed of divided parts 40, 40, 40 divided into three parts.

For this reason, compared with the case where the dividing part 40 is divided into four or more parts, the mold structure can be prevented from becoming complicated and the mold cost can be reduced.
Four support members 56 are attached to the outside of the outer peripheral portion 38.

The operation of the blow molding die described above will be described next.
FIG. 7 is an explanatory diagram of a blank material setting process and a mold matching process.
The blank material setting process will be described with reference to (a). The blank material 29 heated to a predetermined temperature (450 ° C. to 550 ° C.) is set on the upper surface 28 a of the blow mold 28 using the clamp members 77 and 77. The blank material 29 is preferably an Al—Mg-based alloy (5000 series) for superplastic working, and may be an Al—Mg—Si based alloy (A6000 series) for superplastic working.
The mold is held at a predetermined temperature by a heating means (not shown) so that the temperature of the blank material 29 does not decrease.

  The mold matching process will be described with reference to (b). The slide 32 is lowered to the bottom dead center, the blank material 29 is pressed by the product shape peripheral portion 37, and the blank material 29 is pressed by the outer peripheral portion 38. At this time, the upper surface 36 u of the product shape portion 36 contacts the lower surface 32 s of the slide 32.

FIG. 8 is an explanatory diagram of the molding process and the first mold release process.
The molding process will be described with reference to (a). Compressed air as a fluid is supplied from the fluid blowing port 31 to the upper surface 28a of the blowing mold 28, and the blank material (reference numeral 29 in FIG. The blow-molded product 11 is formed by being applied to the molding surface 23 and molded into a predetermined shape.

  The first mold release step will be described with reference to (b). The slide 32 is raised, the product shape peripheral portion 37 is moved in the mold opening direction, and the product shape peripheral portion 37 is released from the blow molded product 11. At this time, since the product shape portion 36 is slidably provided on the product shape peripheral portion 37, when the product shape peripheral portion 37 moves in the mold opening direction, the product shape portion 36 does not move due to its own weight and is blown. The molded product 11 is held.

  In addition, since the outer peripheral portion 38 is slidably provided on the product shape peripheral portion 37, the outer peripheral portion 38 holds the blow molded product 11 without moving due to its own weight. That is, the product shape peripheral portion 37 slides in the mold opening direction while holding the blow molded product 11 by the outer peripheral portion 38 and the product shape portion 36.

  Since the product shape peripheral part 37 constituting one of the divided parts 40 is provided with a seal bead part (reference numerals 70a and 70b in FIG. 5), the blank material (reference numeral 29 in FIG. 7) is formed at the time of molding. When a large force is applied by the seal bead portions 70a and 70b and the blank material 29 is about to flow, the flow of the blank material 29 is restricted by the arc bead 74 that restricts the flow during molding.

  At the time of molding, the blank material (reference numeral 29 in FIG. 7) is pressed and adhered with a strong force by the seal bead portions 70a and 70b and the arc bead 74 which are one of the divided portions 40, and the product shape peripheral portion. In order to release the mold 37 from the blow-molded product 11, a larger force is required than when the product shape portion 36 is released from the blow-molded product 11.

  In this regard, in the present invention, the product shape peripheral portion 37 is slidably provided in the product shape portion 36, and the outer peripheral portion 38 is slidably provided in the product shape peripheral portion 37, so that the product shape portion 36 and the product shape peripheral portion 37 are provided. And the outer peripheral portion 38 can be separated into three parts without releasing at once.

  Specifically, since the product shape portion 36 is released while pressing both sides of the product shape peripheral portion 37 with the product shape portion 36 and the outer peripheral portion 38, it is possible to make it difficult to apply a large force to the blow molded product 11.

  Further, the product shape peripheral portion 37 is provided with seal bead portions (reference numerals 70a and 70b in FIG. 5), and the product shape peripheral portion 37 including the seal bead portions 70a and 70b to which the blow molded product 11 is adhered with a strong force is provided. If the mold is first released and then the product shape portion 36 is released from the blow molded product 11, it is possible to prevent a large force from being applied to the blow molded product 11. Therefore, deformation of the blow molded product 11 can be suppressed.

  In addition to the seal bead portions 70a and 70b, as a portion that adheres to the mold 27 with a strong force, a molding surface having a large inclination angle with respect to the horizontal direction can be given. By including a molding surface with a large inclination angle in the product shape peripheral portion 37 and releasing the product shape peripheral portion 37 first, deformation of the blow molded product 11 can be suppressed.

  That is, first, the product shape peripheral portion 37 that is in close contact with a strong force is released first while the product shape portion 36 and the outer peripheral portion 38 are pressed, and then the product shape portion 36 is released. A large force is not applied to the molded product 11. In particular, since a seal bead portion (reference numerals 70a and 70b in FIG. 5) for sealing the fluid is provided in the product shape peripheral portion 37, the influence on the blow-molded product 11 can be reduced even if the product shape is in close contact. Therefore, deformation of the blow molded product 11 can be suppressed.

  In addition, if each part of the shaping | molding die 27 is further divided and the area released from the blow-molded product 11 at a time is reduced, the force applied to the blow-molded product 11 at the time of mold release is further reduced. Deformation can be further suppressed.

FIG. 9 is an explanatory diagram of the second release process and the third release process.
In (a), in the second mold releasing step, the slide 32 is raised, the product shape peripheral portion 37 is further moved in the mold opening direction from the position of the first mold releasing step, and the driving surfaces 43 and 43 are driven surfaces 44. 44, the product shape portion 36 is moved in the mold opening direction together with the product shape peripheral portion 37, and the product shape portion 36 is released from the blow molded product 11. At this time, since the inflow prevention bead 72 is provided in the outer peripheral part 38, inflow to the mold opening direction of the blow molded product 11 can be prevented.

  In (b), in the third mold releasing step, the slide 32 is raised, the product shape peripheral portion 37 is further moved from the position of the second mold releasing step in the mold opening direction, and the flange portion 65 is applied to the stopper surface 68. The outer peripheral portion 38 is moved in the mold opening direction, and the outer peripheral portion 38 is released from the blow molded product 11.

  That is, the mold 27 includes a product shape portion 36, a product shape peripheral portion 37, and an outer peripheral portion 38. The product shape peripheral portion 37 is slidably provided on the product shape portion 36, and the product shape peripheral portion 37 has an outer peripheral portion 38. Was slidably provided. Product shape that is separated into the product shape portion 36, the product shape peripheral portion 37, and the outer peripheral portion 38 without being released from the blow-molded product 11 at a time, and is more closely attached to other portions. The peripheral portion 37 was first released, the product shape portion 36 was released next to the product shape peripheral portion 37, and finally the outer peripheral portion 38 was released. That is, each part of the mold 27 is released from the blow molded product 11 at different timings.

  Thus, while the mold 27 is divided into three parts and the product shape peripheral part 37 having the bead part is released first, the force applied to the blow molded product 11 can be reduced. By reducing the force applied to the blow-molded product 11, deformation that occurs in the blow-molded product 11 can be suppressed.

FIG. 10 is a manufacturing flow diagram of a blow molded product according to the present invention, and will be described based on FIGS. STXX indicates a step number.
ST01: (Set process): The blank material 29 heated to a predetermined temperature is set in a blow mold 28 as a lower mold.

ST02: (Mold-matching step): The mold 27 is moved in the mold closing direction from above the blank 29, and the mold 27 is aligned with the blow mold 28, and the blank 29 is placed between the blow mold 28 and the mold 27. Pinch.
ST03: (Molding step): Fluid is blown into the mold from the fluid blowing port 31 of the blowing die 28, and the blank material 29 is blow-molded into the molding die 27 with the pressure of this fluid.

ST04: (First mold release step): The product shape peripheral portion 37 is moved in the mold opening direction with respect to the blow mold 28, and the product shape peripheral portion 37 is released from the blow molded product 11.
ST05: (Second mold release step): The product shape part 36 is moved in the mold opening direction with respect to the blow mold 28, and the product shape part 36 is released from the blow molded product 11.

ST06: (Third release step): The outer peripheral portion 38 is moved in the mold opening direction with respect to the blow mold 28, and the outer peripheral portion 38 is released from the blow molded product 11.
That is, each part of the mold 27 is released from the blow molded product 11 at different timings.
ST07: (Blow molded product take-out step): The blow molded product is taken out from the mold.
This completes one molding cycle.

FIG. 11 is a diagram showing another embodiment of FIG. 5, and a difference from FIG. 5 is a so-called step bead 78 as a kind of inflow prevention bead 72 provided in the outer peripheral portion 38.
The step bead 78 includes a first horizontal surface 81 formed substantially horizontally on the blow mold 28, a vertical surface 83 provided continuously outside the first horizontal surface 81, and continuous outside the vertical surface 83. A second horizontal surface 82 provided on the outer peripheral portion 38, an outer peripheral vertical surface 84 facing the vertical surface 83, and an outer peripheral horizontal surface facing the second horizontal surface 82 provided continuously outside the outer peripheral vertical surface 84. And a surface 85.
The step bead 78 is applied when the size of the blank material 29 is limited and a bead including a convex portion and a concave portion cannot be used.

  The present invention is suitable for a blow mold.

It is a perspective view of the blow molded product shape | molded with the metal mold | die for blow molding which concerns on this invention. It is a top view of the metal mold | die for blow molding which concerns on this invention. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is an enlarged view of part 5 of FIG. 3. It is a figure explaining the molding surface provided in the shaping | molding die concerning this invention. It is explanatory drawing of the setting process and mold matching process of a blank material. It is explanatory drawing of a formation process and a 1st mold release process. It is explanatory drawing of a 2nd mold release process and a 3rd mold release process. It is a manufacturing flowchart of the blow molded product which concerns on this invention. It is another Example figure of FIG. It is a figure explaining the basic composition of the conventional technology.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 23 ... Molding surface, 25 ... Mold for blow molding, 27 ... Mold, 28 ... Blowing die, 29 ... Blank material, 31 ... Fluid injection port, 36 ... Product shape part, 37 ... Product shape peripheral part, 38 ... Outer periphery Part, 40 ... division part, 70a, 70b ... seal bead part.

Claims (3)

A molding die having a molding surface, and this molding die are matched with a blowing die having a fluid blowing port, a blank material is sandwiched between the blowing die and the molding die, and the blank material is pressed by the pressure of the fluid blown from the blowing die. In the mold release method of the blow molded product, the mold is moved to the mold opening direction after the blank material is blow molded, and the mold is released from the blow molded product.
The mold is composed of divided parts divided into three or more parts, and the divided parts are released from the blow-molded product at different timings. 2. The method for releasing a blow-molded product according to claim 1, wherein a seal bead portion is provided in one of the divided portions that first move in the mold opening direction by mold opening after molding. .   The divided portion includes a product shape portion that determines a product shape, a product shape peripheral portion that is disposed outside the product shape portion, and an outer peripheral portion that is disposed outside the product shape peripheral portion. 3. A method for releasing a blow molded article according to claim 1 or 2.

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