JP2023023498A - Apparatus for manufacturing resin molded article, and method for manufacturing resin molded article - Google Patents

Abstract

To reduce time required for fabrication of a stationary mold, and to reduce cost required for the fabrication of the stationary mold compared to a case where the entire stationary mold is fabricated for each type of resin molded product.SOLUTION: An apparatus 10 for manufacturing a resin molded article comprises: a stationary mold 20 having a stationary side molding surface 20a; and a movable mold 30 having a movable side molding surface 30a, and provided to be advanceable to and retreatable from the stationary mold 20. The resin molded article is molded by filling a cavity configured by the stationary side molding surface 20a and the movable side molding surface 30a with a resin, and a design surface of the resin molded article is molded by the stationary side molding surface 20a. The stationary mold 20 includes a stationary side main mold 21 having a stationary side main molding surface 21a, and a stationary side insert mold 22 having a stationary side sub-molding surface 22a and detachably provided onto the stationary side main mold 21. The stationary side molding surface 20a is configured by the stationary side main molding surface 21a and the stationary side sub-molding surface 22a.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an apparatus for manufacturing a resin molded product and a method for manufacturing a resin molded product.

Patent Literature 1 discloses a resin molding die apparatus (hereinafter referred to as a die apparatus) for manufacturing resin molded products such as vehicle bumpers. This mold apparatus includes a stationary mold having a stationary molding surface and a movable mold having a movable molding surface and provided so as to move forward and backward relative to the stationary mold. A resin molded product is molded by filling a resin into a cavity formed by a fixed side molding surface and a movable side molding surface. At this time, the design surface of the resin molded product is molded by the stationary molding surface.

JP-A-7-223244

A plate attachment portion to which a license plate is attached is provided on the design surface of the vehicle bumper. The shape of the license plate varies depending on the destination of the vehicle. Therefore, even for the same type of vehicle, the shape of the plate mounting portion may differ depending on the destination of the vehicle. In this case, the entire fixed mold is newly manufactured so as to correspond to the shape of the plate mounting portion. As a result, there is a problem that it takes a lot of time and money to manufacture the fixed mold.

It should be noted that such problems are not limited to the manufacturing apparatus and manufacturing method for manufacturing vehicle bumpers, and similarly occur in manufacturing apparatuses and manufacturing methods for other resin molded products. Moreover, such a problem becomes conspicuous especially when carrying out high-mix low-volume production.

An apparatus for manufacturing a resin molded product for solving the above-mentioned problems includes a fixed mold having a fixed side molding surface and a movable mold having a movable side molding surface and provided so as to move back and forth with respect to the fixed mold. A resin molded product is molded by filling a resin into a cavity formed by the fixed molding surface and the movable molding surface, and the design surface of the resin molded product is molded by the fixed molding surface. The fixed mold includes a main mold having a main molding surface and a nesting mold having a sub-molding surface and being detachably attached to the main mold, wherein the main molding surface and the sub-molding surface The fixed-side molding surface is configured by

According to the same configuration, it is possible to select one nesting mold from a plurality of nesting molds each having a plurality of sub-molding surfaces having mutually different shapes, and mount it on the main mold. As a result, it is possible to manufacture a plurality of types of resin molded products in which the portions molded by the main molding surface of the design surface have the same shape, but the portions molded by the sub molding surface have different shapes. Thus, according to the above configuration, the main mold can be shared regardless of the type of resin molded product.

Therefore, it is possible to shorten the time required for manufacturing the fixed mold and reduce the cost required for manufacturing the fixed mold, as compared with the case where the entire fixed mold is manufactured for each type of resin molded product.

In the apparatus for manufacturing a resin molded product, the main mold has a recess into which the nesting mold is inserted, and a through hole that opens into the recess and extends in the moving direction of the movable mold. , an extrusion shaft capable of pushing out the insert die from the main die toward the movable die is inserted into the through-hole, and the insert is extruded by sliding the extrusion shaft with respect to the main die. It is preferable to have an extrusion device for extruding the mold from the main mold.

According to this configuration, by inserting the nesting mold into the concave portion of the main mold, the nesting mold can be accurately positioned and attached to the main mold.
Further, according to the above configuration, the inserting die is pushed out from the main die toward the movable die by sliding the extrusion shaft inserted through the through hole of the main die with respect to the main die by the extrusion device. Thereby, the nesting mold can be easily taken out from the main mold.

In the apparatus for manufacturing a resin molded product, the extrusion device includes a conversion mechanism that converts the force with which the movable mold advances toward the fixed mold into a force with which the extrusion shaft slides with respect to the main mold. is preferred.

According to this configuration, the conversion mechanism converts the force with which the movable mold advances toward the fixed mold into a force with which the extrusion shaft slides with respect to the main mold. This eliminates the need for a dedicated configuration for generating driving force for the extrusion device. Therefore, the configuration of the extrusion device can be simplified.

In the apparatus for manufacturing a resin molded product, the movable mold has a mounting portion for detachably mounting an extrusion rod projecting from the movable mold toward the fixed mold, and the conversion mechanism is configured to attach the extrusion rod to the movable mold. An input section pressed toward the side opposite to the movable die by the tip, an output section pressing the base end of the extrusion shaft toward the movable die, and provided between the input section and the output section. It is preferred to have a conversion member having a pivot center and a pivot point.

According to this configuration, when the movable mold is advanced toward the fixed mold in a state where the push rod is attached to the mounting portion of the movable mold, the push rod slides toward the fixed mold. At this time, the tip of the pushing rod presses the input portion of the converting member toward the side opposite to the movable die. As a result, the conversion member is rotated about the rotation center, and the base end of the extrusion shaft is pressed toward the movable die by the output portion of the conversion member. Therefore, the conversion mechanism can be easily implemented.

In the apparatus for manufacturing a resin molded product described above, the main mold, the nested mold, the main molding surface, and the sub-molding surface are respectively formed into a fixed main mold, a fixed nested mold, a fixed main molding surface, and a fixed mold. When the side secondary molding surface is used, the movable mold has a movable side main mold having a movable side main molding surface, and a movable side mold having a movable side secondary molding surface and being detachably attached to the movable side main mold. It is preferable that the movable-side main molding surface and the movable-side secondary molding surface constitute the movable-side molding surface.

According to the same configuration, it is possible to select one movable side nesting die from a plurality of movable side nesting dies each having a plurality of movable side secondary molding surfaces having mutually different shapes, and mount it on the movable side main mold. Become. As a result, of the surface opposite to the design surface, the portions molded by the movable-side main molding surface have the same shape, but the portions molded by the movable-side secondary molding surface have different shapes. Molded articles can be produced. Thus, according to the above configuration, the movable side main mold can be shared regardless of the type of the resin molded product.

Therefore, it is possible to shorten the time required for manufacturing the movable molds and reduce the cost required for manufacturing the movable molds, as compared with the case where the entire movable mold is manufactured for each type of resin molded product.

Further, a method for manufacturing a resin molded product for solving the above-described problems is a method for manufacturing a resin molded product using the above-described resin molded product manufacturing apparatus, wherein the movable mold is opened. Preferably, one nesting die is selected from a plurality of nesting dies each having a plurality of sub-molding surfaces having mutually different shapes, and is mounted on the main mold.

According to this method, the same effects as those of the above invention can be obtained.

According to the present invention, it is possible to shorten the time required for manufacturing the fixed mold and to reduce the cost required for manufacturing the fixed mold compared to the case where the entire fixed mold is manufactured for each type of resin molded product. can be done.

FIG. 1 is a cross-sectional view showing a state in which a movable mold is opened in an embodiment of an apparatus for manufacturing a resin molded product. 2 is a cross-sectional view showing a state in which resin is injected into a cavity in the manufacturing apparatus of FIG. 1. FIG. 3(a) to 3(c) are cross-sectional views sequentially showing how the movable side telescopic mold is removed from the movable side main mold in FIG. 4(a) and 4(b) are cross-sectional views sequentially showing how another movable-side nesting die is attached to the movable main die of FIG. 5(a) to 5(c) are cross-sectional views sequentially showing how the fixed side telescopic mold is removed from the fixed side main mold shown in FIG. FIG. 6(a) is a cross-sectional view showing how the fixed side telescopic mold is removed from the fixed side main mold of FIG. 1, and FIGS. Fig. 10 is a cross-sectional view sequentially showing how another fixed-side telescopic mold is attached to the . 7 is a cross-sectional view showing a state in which resin is injected into a cavity formed by another movable-side nesting die and fixed-side nesting die in the manufacturing apparatus of FIG. 1. FIG. 8(a) and 8(b) are cross-sectional views showing, in order, how to remove the fixed side nesting die from the fixed side main die in the fixed die of the manufacturing apparatus of the modified example.

An embodiment of a resin molded product manufacturing apparatus and a resin molded product manufacturing method will be described below with reference to FIGS. 1 to 7. FIG.
As shown in FIG. 1, an apparatus for manufacturing a resin molded product (hereinafter referred to as manufacturing apparatus 10) has a fixed mold 20 having a fixed side molding surface 20a and a movable side molding surface 30a. and a movable die 30 that can be provided.

As shown in FIG. 2, a cavity 80 is formed by the stationary molding surface 20a and the movable molding surface 30a. A resin molded product 90 is molded by filling the cavity 80 with resin. At this time, the design surface 91 of the resin molded product 90 is molded by the fixed molding surface 20a, and the surface 92 opposite to the design surface 91 of the resin molded product 90 is molded by the movable molding surface 30a. The resin molded product 90 of this embodiment is, for example, a vehicle front bumper.

In addition, henceforth, the up-down direction shown to FIGS. 1-7 may only be called an up-down direction.
Next, the fixed mold 20 will be described in detail.

<Fixed type 20>
As shown in FIGS. 1 and 2, the fixed mold 20 includes a fixed side mounting plate 20A and a base 20B attached to the front surface (the left side in the figure) of the fixed side mounting plate 20A.

A stationary main mold 21 is attached to the base 20B.
A fixed side nesting die 22 is detachably attached to the fixed side main die 21 .
As shown in FIG. 1, the stationary main mold 21 has a stationary main molding surface 21a. The fixed-side main molding surface 21a is formed by a concave surface formed on the front surface of the fixed-side main mold 21 (the left end surface in the drawing).

The fixed main die 21 has a fixed recess 21b into which the fixed insert die 22 is inserted. The fixed-side concave portion 21b opens to the fixed-side main molding surface 21a.
The stationary nesting die 22 has a stationary secondary molding surface 22a.

The stationary-side main molding surface 21a and the stationary-side secondary molding surface 22a constitute the stationary-side molding surface 20a. The fixed-side secondary forming surface 22a forms a plate attachment portion to which, for example, a license plate is attached on the design surface 91 of the vehicle front bumper.

As shown in FIG. 2, the fixed main mold 21 has a through hole 21c that opens into the fixed concave portion 21b and extends in the advancing and retreating direction of the movable mold 30 (horizontal direction in FIG. 2).
An extrusion shaft 23 capable of pushing out the stationary nesting die 22 from the stationary main die 21 toward the movable die 30 is inserted through the through hole 21c.

The proximal end of the extrusion shaft 23 is fitted into a recess provided on the back surface of the fixed-side insert die 22 .
The extrusion shaft 23 protrudes into the internal space S1 of the base 20B from the back surface of the fixed main mold 21 (the right side surface in the figure).

As shown in FIG. 1, the outer peripheral surface of the push shaft 23 is provided with an engaging recess 23a.
The stationary main mold 21 is provided with an insertion hole 21d extending in a direction (vertical direction in the figure) perpendicular to the axial direction of the extrusion shaft 23 (horizontal direction in the figure). A retainer shaft 24 is inserted into the insertion hole 21d. The tip of the retainer shaft 24 is engaged with the engaging recess 23a. This prevents the extrusion shaft 23 from coming out of the fixed side main mold 21, that is, the fixed side nesting die 22 from coming out.

As shown in FIG. 5( a ), the fixed mold 20 includes an extrusion device 25 that pushes the fixed nesting mold 22 out of the fixed main mold 21 by sliding the extrusion shaft 23 with respect to the fixed main mold 21 . ing.

The fixed main die 21 is provided with an insertion hole 21e that extends in the advancing and retracting direction of the movable die 30 (horizontal direction in the figure). In this embodiment, the insertion hole 21e is provided above the through hole 21c.

The extrusion device 25 includes a conversion mechanism 26 that converts the force with which the movable mold 30 advances toward the fixed mold 20 into a force with which the extrusion shaft 23 slides with respect to the fixed main mold 21 .
The conversion mechanism 26 is provided above the internal space S1 of the base 20B.

The conversion mechanism 26 includes a base 27 provided on the back surface of the fixed main mold 21, a support shaft 28 provided on the base 27, and a conversion member 29 rotatably supported by the support shaft 28. ing.

The support shaft 28 has an axis extending in a direction perpendicular to both the forward/backward direction of the movable die 30 (horizontal direction in the drawing) and the vertical direction (perpendicular to the plane of the drawing).
The conversion member 29 has an input portion 29a, an output portion 29b, and a rotation center portion 29c provided between the input portion 29a and the output portion 29b. A rotation center portion 29c is rotatably supported by a support shaft 28. As shown in FIG. That is, the conversion member 29 is supported so as to be rotatable about the axis of the support shaft 28 .

Next, the movable mold 30 will be described in detail.
<Movable type 30>
As shown in FIGS. 1 and 2, the movable mold 30 includes a movable mounting plate 30A and a block 30B attached to the front surface (the right side in the figure) of the movable mounting plate 30A.

A movable main mold 31 is attached to the block 30B.
A movable side nesting die 32 is detachably attached to the movable side main die 31 .
As shown in FIG. 1, the movable side main mold 31 has a movable side main molding surface 31a. The movable-side main molding surface 31a includes a convex surface formed on the front surface of the movable-side main mold 31 (the end surface on the right side in FIG. 2).

The movable main die 31 has a movable recess 31b into which the movable nesting die 32 is inserted. The movable side concave portion 31b opens to the movable side main molding surface 31a.
The movable side nesting die 32 has a movable side secondary molding surface 32a.

The movable-side main molding surface 31a and the movable-side secondary molding surface 32a constitute the movable-side molding surface 30a.
As shown in FIG. 2, the movable side main mold 31 has a through hole 31c that opens into the movable side concave portion 31b and extends in the moving direction of the movable mold 30 (horizontal direction in the figure).

An extrusion shaft 33 capable of pushing the movable side insert die 32 from the movable side main die 31 toward the fixed die 20 is inserted through the through hole 31c.
The proximal end of the extrusion shaft 33 is fitted into a recess provided on the back surface of the movable side nesting die 32 .

The extrusion shaft 33 protrudes into the internal space S2 of the block 30B from the back surface of the movable main mold 31 (the left surface in the figure).
As shown in FIG. 1, the outer peripheral surface of the push shaft 33 is provided with an engaging recess 33a.

The movable side main mold 31 is provided with an insertion hole 31d extending in a direction (vertical direction in the figure) perpendicular to the axial direction of the extrusion shaft 33 (horizontal direction in the figure). A retainer shaft 34 is inserted into the insertion hole 31d. The tip of the retainer shaft 34 is engaged with the engaging recess 33a. This prevents the extrusion shaft 33 from coming out of the movable side main die 31, that is, the moving side nesting die 32 from coming out.

As shown in FIG. 3( a ), the movable mold 30 includes an extrusion device 35 that pushes the movable nesting mold 32 out of the movable main mold 31 by sliding the extrusion shaft 33 with respect to the movable main mold 31 . ing.

The extrusion device 35 is connected to the ejection plate 36 housed in the internal space S2 of the block 30B and the rear surface of the ejection plate 36 (the left surface in the figure), and is connected to the forward and backward direction of the movable mold 30 (left and right in the figure). direction). The connecting shaft 37 passes through the movable mounting plate 30A and is connected to a driving device (not shown).

As shown in FIG. 5(b), a mounting portion 31e for detachably mounting the push rod 40 is provided on the front surface of the movable side main mold 31 (the right side surface in the drawing). The mounting portion 31 e is provided at a position facing the insertion hole 21 e of the fixed mold 20 . The attachment portion 31e is, for example, a female screw hole. In this case, the proximal end of the pushing rod 40 is provided with a male thread that is screwed into the female threaded hole. The push rod 40 protrudes from the movable die 30 toward the fixed die 20 by being attached to the attachment portion 31e.

<Replacement procedure for movable side insert type>
Next, referring to FIGS. 3 and 4, the movable side nesting die 32 is replaced with another movable side nesting die 132 having a movable side secondary molding surface 132a different in shape from the movable side secondary molding surface 32a. The replacement procedure will be explained.

First, as shown in FIG. 3A, with the movable mold 30 being opened, the retainer shaft 34 is extracted from the insertion hole 31d.
Next, as shown in FIG. 3B, the driving device (not shown) of the extrusion device 35 slides the connecting shaft 37 toward the stationary mold 20 until it comes into contact with the back surface of the movable main mold 31 . As a result, the ejector shaft 33 and the movable side insert die 32 are ejected toward the fixed die 20 via the ejector plate 36 .

Next, as shown in FIG. 3(c), an operator or robot grabs and pulls the movable side nesting die 32 to remove the movable side nesting die 32 and the extrusion shaft 33 from the movable side main die 31. .

Next, as shown in FIG. 4A, an operator or a robot inserts the extrusion shaft 33 through the through hole 31c. At this time, the proximal end of the extrusion shaft 33 is fitted into the concave portion on the back surface of the movable side nesting die 132 .

Next, as shown in FIG. 4(b), the movable side nesting die 132 is inserted into the movable side concave portion 31b. By inserting the retaining shaft 34 into the insertion hole 31d, the tip of the retaining shaft 34 is engaged with the engaging recess 33a of the retaining shaft 34. As shown in FIG. The movable-side main molding surface 31a and the movable-side secondary molding surface 132a constitute the movable-side molding surface 130a.

In this way, the replacement from the movable side telescopic mold 32 to the movable side telescopic mold 132 is completed.
<Replacement procedure for fixed side insert type>
Next, referring to FIGS. 5 and 6, the fixed side nesting die 22 is replaced with another fixed side nesting die 122 having a fixed side secondary molding surface 122a having a different shape from the fixed side secondary molding surface 22a. The replacement procedure will be explained.

First, as shown in FIG. 5A, with the movable mold 30 being opened, the retainer shaft 24 is extracted from the insertion hole 21d.
Next, as shown in FIG. 5(b), the proximal end of the push rod 40 is attached to the attachment portion 31e of the movable side main mold 31. Next, as shown in FIG. When the movable mold 30 in this state is advanced toward the fixed mold 20, the pushing rod 40 slides toward the fixed mold 20, and the tip of the pushing rod 40 moves through the insertion hole 21e toward the fixed mounting plate 20A. Moving.

When the movable mold 30 is advanced further, as shown in FIG. 5(c), the tip of the pushing rod 40 protrudes from the back surface of the fixed side main mold 21, and the input portion 29a of the conversion member 29 is connected to the fixed side mounting plate. Press toward 20A. As a result, the conversion member 29 is rotated in the clockwise direction in FIG. be done.

Next, as shown in FIG. 6( a ), an operator or robot grabs and pulls the fixed side insert die 22 to remove the fixed side insert die 22 and the extrusion shaft 23 from the fixed side main die 21 . .

Next, as shown in FIG. 6(b), an operator or a robot inserts the extrusion shaft 23 through the through hole 21c. At this time, the proximal end of the extrusion shaft 23 is fitted into the recess on the back surface of the fixed-side nesting die 122 .

Next, as shown in FIG. 6(c), the stationary nesting die 122 is inserted into the stationary recess 21b. By inserting the retaining shaft 24 into the insertion hole 21d, the tip of the retaining shaft 24 is engaged with the engaging recess 23a of the retaining shaft 24. As shown in FIG. The stationary main molding surface 21a and the stationary secondary molding surface 122a constitute the stationary molding surface 120a.

In this way, the replacement of the stationary side nesting die 22 with the stationary side telescoping die 122 is completed.
At this time, the output portion 29b of the conversion member 29 is pressed toward the fixed side mounting plate 20A by the extrusion shaft 23 protruding from the back surface of the fixed side main die 21 into the internal space S1 of the base 20B. As a result, the conversion member 29 is rotated in the counterclockwise direction in FIG.

As shown in FIG. 7, a cavity 180 is formed by the stationary molding surface 120a and the movable molding surface 130a. A resin molded product 190 is molded by filling the cavity 180 with resin. At this time, the design surface 191 of the resin molded product 190 is molded by the fixed molding surface 120a, and the surface 192 opposite to the design surface 191 of the resin molded product 190 is molded by the movable molding surface 130a.

Next, the effects of this embodiment will be described.
(1) The fixed mold 20 of the resin molded product manufacturing apparatus 10 has a fixed main mold 21 having a fixed main molding surface 21a and a fixed secondary molding surface 22a. It includes a fixed-side telescopic mold 22 that is freely provided. The fixed-side main molding surface 21a and the fixed-side secondary molding surface 22a constitute the fixed-side molding surface 20a.

According to such a configuration, one fixed side nesting mold 22 (122) is selected and fixed from a plurality of fixed side nesting molds 22, 122 each having a plurality of fixed side secondary molding surfaces 22a, 122a having mutually different shapes. It becomes possible to attach to the side main mold 21 . As a result, portions of the design surface 91 (191) molded by the fixed-side main molding surface 21a have the same shape, while portions molded by the fixed-side secondary molding surface 22a (122a) have different shapes. Various types of resin molded products 90 (190) can be manufactured. Thus, according to this embodiment, the fixed main mold 21 can be shared regardless of the type of the resin molded product 90 (190). Therefore, compared to the case where the entire fixed mold 20 is manufactured for each type of the resin molded product 90 (190), the time required for manufacturing the fixed mold 20 can be shortened, and the cost required for manufacturing the fixed mold 20 can be reduced. can save money.

(2) By inserting the fixed side nesting die 22 into the fixed side concave portion 21b of the fixed side main die 21, the fixed side telescoping die 22 can be accurately positioned and attached to the fixed side main die 21. can be done.

In addition, by sliding the extrusion shaft 23 inserted through the through hole 21 c of the fixed side main mold 21 with respect to the fixed side main mold 21 by the extrusion device 25 , the fixed side nesting mold 22 is pushed toward the movable mold 30 . is extruded from the fixed main mold 21 . As a result, the stationary nesting die 22 can be easily removed from the stationary main die 21 .

(3) The conversion mechanism 26 converts the force with which the movable mold 30 advances toward the fixed mold 20 into a force with which the extrusion shaft 23 slides with respect to the fixed main mold 21 . Therefore, a dedicated configuration for generating the driving force of the extrusion device 25 becomes unnecessary. Therefore, the configuration of the extrusion device 25 can be simplified.

(4) When the movable mold 30 is advanced toward the fixed mold 20 with the push rod 40 attached to the mounting portion 31 e of the movable mold 30 , the push rod 40 slides toward the fixed mold 20 . At this time, the tip of the pushing rod 40 presses the input portion 29 a of the conversion member 29 toward the side opposite to the movable die 30 . As a result, the conversion member 29 is rotated about the rotation center portion 29 c , and the output portion 29 b of the conversion member 29 presses the proximal end of the extrusion shaft 23 toward the movable die 30 . Therefore, the conversion mechanism 26 can be easily embodied.

(5) The movable mold 30 has a movable side main mold 31 having a movable side main molding surface 31a and a movable side secondary molding surface 32a. mold 32; A movable-side main molding surface 31a and a movable-side secondary molding surface 32a constitute a movable-side molding surface 30a.

According to such a configuration, one movable side nesting die 32 (132) is selected from a plurality of movable side nesting dies 32 (132) each having a plurality of movable side secondary molding surfaces 32a (132a) having mutually different shapes. can be attached to the movable side main mold 31 by As a result, the portions formed by the movable-side main forming surface 31a of the opposite side surface 92 (192) have the same shape, but the portions formed by the movable-side secondary forming surface 32a have different shapes. of the resin molding 90 (190) can be manufactured. Thus, according to this embodiment, the movable main mold 31 can be shared regardless of the type of the resin molded product 90 (190). Therefore, compared to the case where the entire movable mold 30 is manufactured for each type of the resin molded product 90 (190), the time required for manufacturing the movable mold 30 can be shortened, and the cost required for manufacturing the movable mold 30 can be reduced. can save money.

(6) The method for manufacturing a resin molded product is such that, in a state where the movable mold 30 is opened, one fixed side nesting mold 22 (122) is selected from a plurality of fixed side nesting molds 22 and 122 and fixed. It is attached to the side main mold 21 .

According to such a method, it is possible to obtain the same effect as the above effect (1).
<Change example>
For example, the above-described embodiment can be modified and implemented as follows. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

・By dividing the fixed-side molding surface 20a into the fixed-side main molding surface 21a and the fixed-side secondary molding surface 22a, a minute gap is generated at the boundary between these surfaces. Such gaps may cause burrs on the design surface 91 of the resin molded product 90 . In this case, burrs may be removed in a post-process. Even in this case, the total cost required to manufacture the resin molded product 90 can be reduced if the production is of a large variety in small quantities.

The fixed-side secondary forming surface 22a may be formed by forming portions corresponding to fog lamps provided on both sides in the vehicle width direction on the design surface 91 of the vehicle front bumper. In this case, a plurality of fixed side telescopic dies 22 and movable side telescopic dies 32 may be provided.

- The manufacturing apparatus and manufacturing method according to the present invention are not limited to those for manufacturing a vehicle front bumper, but can also be applied to a vehicle rear bumper. It can also be applied to other vehicle exterior parts such as an outer mirror cover. It can also be applied to vehicle interior parts such as instrument panels and door trims.

- The movable side main mold 31 may include a main mold main body and a slide mold that can slide in a direction intersecting the moving direction of the movable mold 30 . The same applies to the fixed side main mold 21 .

- An ejector pin (not shown) for pushing out the resin molded product 90 from the movable mold 30 may be slid by the pushing device 35 . In this case, the ejector pin may be completely slid within a stroke range in which the ejector plate 36 does not contact the tip of the ejector shaft 33, for example.

- An extrusion device 25 similar to that of the fixed mold 20 can also be applied to the movable mold 30 .
- In the above-described embodiment, the movable mold 30 includes the movable main mold 31 and the movable nesting mold 32, but the movable nesting mold 32 may be omitted. It is sufficient that the fixed mold 20 includes at least the fixed main mold 21 and the fixed nested mold 22 .

- In the above embodiment, the extrusion device 25 including the conversion mechanism 26 was exemplified, but the extrusion device is not limited to one provided with the conversion mechanism 26 . For example, the extrusion device can be configured by a power cylinder. As shown in FIG. 8(a), the pushing device 125 is an electric cylinder and is attached to the fixed-side mounting plate 20A. The extrusion device 125 includes a rod 126 that can reciprocate in the advancing and retreating direction of the movable die 30 . As shown in FIG. 8( b ), the rod 126 slides the extrusion shaft 23 with respect to the stationary main mold 21 to push the stationary nesting die 22 out of the stationary main mold 21 . In this case, the pushing rod 40 and the insertion hole 21e can be omitted.

- The manufacturing apparatus according to the present invention is not limited to the one provided with the extrusion device 25 . For example, the extrusion shaft 23 may be manually slid from the back side of the fixed main mold 21 . The same applies to the movable mold 30 as well.

- The extrusion shaft 23 can be omitted. The fixed side nesting die 22 may be detachably attached to the fixed side main die 21. For example, the fixed side telescoping die 22 may be detachably attached to the fixed side main die 21 by a magnet. may The same applies to the movable mold 30 as well.

- The fixed side main mold 21 can also be composed of a plurality of split molds. The same applies to the movable side main mold 31 as well.

DESCRIPTION OF SYMBOLS 10... Manufacturing apparatus 20... Fixed die 20A... Fixed-side mounting plate 20B... Base 20a, 120a... Fixed-side molding surface 21... Fixed-side main mold 21a... Fixed-side main molding surface 21b... Fixed-side concave part 21c... Through hole 21d... Insertion Hole 21e... Insertion hole 22, 122... Fixed side telescopic mold 22a, 122a... Fixed side sub-molding surface 23... Extrusion shaft 23a... Engagement recessed part 24... Retaining shaft 25, 125... Extrusion device 26... Conversion mechanism 27... Base 28... Support shaft 29... Conversion member 29a... Input part 29b... Output part 29c... Rotation center part 30... Movable mold 30A... Movable side mounting plate 30B... Blocks 30a, 130a... Movable side molding surface 31... Movable side main mold 31a Movable side main molding surface 31b Movable side concave portion 31c Through hole 31d Insertion hole 31e Mounting portion 32, 132 Movable side telescopic mold 32a, 132a Movable side secondary molding surface 33 Extrusion shaft 33a Engaging concave portion DESCRIPTION OF SYMBOLS 34... Retaining shaft 35... Extrusion device 36... Ejection plate 37... Connection shaft 40... Ejection rod 80, 180... Cavity 90, 190... Resin molded product 91, 191... Design surface 92, 192... Opposite surface 126... Rod S1 , S2... internal space

Claims (6)

a stationary mold having a stationary molding surface;
a movable mold having a movable side molding surface and provided so as to move forward and backward with respect to the fixed mold;
A manufacturing apparatus for molding a resin molded product by filling a resin into a cavity formed by the fixed molding surface and the movable molding surface and molding a design surface of the resin molded product by the fixed molding surface. ,
The fixed type
a main mold having a main molding surface;
a nesting mold having a sub-molding surface and detachably provided with respect to the main mold;
The fixed-side molding surface is composed of the main molding surface and the secondary molding surface,
Equipment for manufacturing resin molded products. The main die has a recess into which the nesting die is inserted, and a through hole that opens into the recess and extends in the moving direction of the movable die,
An extrusion shaft is inserted through the through-hole and is capable of pushing the insert die from the main die toward the movable die,
An extrusion device for extruding the insert mold from the main mold by sliding the extrusion shaft with respect to the main mold,
The apparatus for manufacturing a resin molded product according to claim 1. The extrusion device includes a conversion mechanism that converts the force with which the movable mold advances toward the fixed mold into a force with which the extrusion shaft slides with respect to the main mold.
The apparatus for manufacturing a resin molded product according to claim 2. The movable mold has a mounting portion for detachably mounting an extrusion rod projecting from the movable mold toward the fixed mold,
The conversion mechanism includes an input section that is pressed by the tip of the extrusion rod toward the side opposite to the movable die, an output section that presses the base end of the extrusion shaft toward the movable die, and the input section. A conversion member having a rotation center provided between the output unit,
The apparatus for manufacturing a resin molded product according to claim 3. When the main mold, the nested mold, the main molding surface, and the secondary molding surface are the fixed main mold, the fixed nested mold, the fixed main molding surface, and the fixed secondary molding surface, respectively,
The movable type
a movable side main mold having a movable side main molding surface;
a movable side telescopic mold having a movable side secondary molding surface and provided detachably with respect to the movable side main mold;
The movable-side main molding surface and the movable-side secondary molding surface constitute the movable-side molding surface,
The apparatus for manufacturing a resin molded product according to any one of claims 1 to 4. A method for manufacturing a resin molded product using the apparatus for manufacturing a resin molded product according to any one of claims 1 to 5,
In a state in which the movable mold is opened, one nesting mold is selected from the plurality of nesting molds each having a plurality of the sub-molding surfaces having mutually different shapes, and is mounted on the main mold.
A method for manufacturing a resin molded product.

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