Resin molding apparatus and resin molded article

Abstract

The present application provides a resin molding device and a resin molded product. The resin molding device is provided with a cutting member having a cutting portion capable of cutting a boundary by advancing and retreating with respect to the boundary between a main body portion and a gate filling portion. An end portion of the main body portion and the gate filling portion are connected via the boundary in an opening and closing direction of a mold. The cutting member is capable of advancing and retreating in a direction intersecting the opening and closing direction of the mold to cut the boundary.

Description

Technical Field

[0001] The present invention relates to a resin molding apparatus capable of manufacturing resin molded articles and resin molded articles, the resin molding apparatus having a cutting member capable of cutting molten resin within a mold. Background Technology

[0002] Some resin molded articles are formed by filling molten resin into a space formed inside a mold, and then allowing the molten resin to solidify. Inside the mold, there are flow paths for the molten resin to flow into the shape of the molded article.

[0003] This flow path includes a sprue into which molten resin injected from the injection molding machine initially flows, a gate that serves as an entrance to the space leading to the molded article, and a runner that forms a path from the sprue to the gate. Japanese Patent No. 6092803 discloses technology related to molds forming such flow paths.

[0004] The mold disclosed in Japanese Patent No. 6092803, in addition to the mold body, also includes a cutting component that cuts off the boundary between the resin filling the gate and the molded article. Because the cutting component is provided inside the mold, gate processing after the molded article is removed can be omitted. Summary of the Invention

[0005] However, the mold gate disclosed in Patent Document 1 is a side gate located on the side of the molded article. In the case of a side gate, the side of the molded article becomes a cut surface, so there is room for improvement from the viewpoint of the aesthetics of the resin molded article.

[0006] The objective of this invention is to provide a resin molding apparatus that can improve the aesthetics of resin molded articles.

[0007] This disclosure provides a resin molding apparatus comprising:

[0008] A mold having a molding space capable of forming a resin molded article and a gate serving as an inlet for molten resin to flow into the molding space, and capable of forming a main body and a gate-filling portion, wherein the main body is the molten resin filling the molding space and the gate-filling portion is the molten resin filling the gate; and

[0009] A cutting component has a cutting portion capable of cutting off a boundary by moving forward and backward relative to the boundary between the end of the main body and the gate filling portion. When cutting off the boundary, the cutting component can form the main body together with the mold.

[0010] The end portion of the main body and the gate filling portion are connected in the opening and closing direction of the mold via the boundary.

[0011] The cutting component is capable of moving forward and backward in a direction intersecting the opening and closing direction of the mold to cut the boundary.

[0012] The present invention provides a resin molding apparatus that can improve the aesthetics of resin molded articles. Attached Figure Description

[0013] Figure 1 A is a top view of a resin molded part that is filled into the mold and integrated with the gate and runner. Figure 1 B is from Figure 1 The side view observed in the direction of arrow A1B.

[0014] Figure 2 A is a cross-sectional view of the resin molding apparatus. Figure 2 B is Figure 1 Sectional view of line 2B-2B of B.

[0015] Figure 3 Figure A illustrates the state in which the cutting component cuts off the molten resin. Figure 3 Figure B is a diagram illustrating the state of the resin molded article after it has been removed from the resin molding device.

[0016] Figure 4 This is a diagram illustrating the function of an embodiment. Detailed Implementation

[0017] The embodiments are described with reference to the accompanying drawings. Furthermore, the embodiments described herein are not intended to specifically limit the invention. In the figures, Fr represents front, Rr represents rear, Le represents left, Ri represents right, Up represents top, and Dn represents bottom.

[0018] <Example>

[0019] Reference Figure 3 Section B shows the end portion 23 of a resin molded article 20 that can be mounted on a vehicle. Hereinafter, the direction in which the front side 21 (the side easily seen from the outside, the design side) of the resin molded article 20 faces is defined as the front side (upper), and the direction in which the back side 22 faces is defined as the back side (lower). The end portion 23 is a curved shape that bends from the front side to the back side. In other words, it can also be described as a shape in which only the end portion 23 is set to be thicker.

[0020] In detail, the end portion 23 has an end face 21, an end back face 25, a side face 26, and an opposite face 27 of the opposite side of the side face 26. The side face 26 is slightly curved in a lateral bulge manner. In the side face 26, with the top 26a of the side face 26 as the boundary 14, the front side is designated as the first side portion 26b, and the back side is designated as the second side portion 26c. The shape of the resin molded article 20 and the shape of the end portion 23 are not limited to the shapes shown in the embodiment. Furthermore, the application of the resin molded article 20 is also arbitrary.

[0021] Reference Figure 2 A and Figure 2 B. The resin molding apparatus 10 for manufacturing resin molded articles 20 can be installed on an injection molding machine (not shown).

[0022] The resin molding apparatus 10 includes a mold 30 having a molding space 30a capable of molding a resin molded article 20. The mold 30 includes a fixed mold 32 and a movable mold 31 movable relative to the fixed mold 32. The direction of movement of the movable mold 31 is the opening and closing direction of the mold 30. The fixed mold 32 is located on the back side, and the movable mold 31 is located on the front side.

[0023] The fixed mold 32 has a gate 33 that serves as an inlet for the molten resin M to flow into the molding space 30a, a sprue (not shown) into which the molten resin M initially flows from the syringe of the injection molding machine, and a runner 34 that serves as a path from the sprue to the gate 33.

[0024] Reference Figure 1 A, Figure 1 B, Figure 2 A and Figure 2 B. Molten resin M, which is filled in mold 30, fills molding space 30a and has a main body 40 with the same shape as resin molded article 20, a gate filling part 12 filled in gate 33, and a runner filling part 13 filled in runner 34.

[0025] The end 43 of the main body 40 and the gate filling part 12 are connected in the opening and closing direction (up and down direction) of the mold 30 via the boundary 14 between the end 43 and the gate filling part 12.

[0026] The front 44 and a portion of the side 46 of the main body 40 (the first side 46b of the side 46 that is closer to the front than the top 46a) are formed by the moving mold 31. The back 42 and the opposite side 47 of the end 43 of the main body 40 are formed by the fixed mold 32.

[0027] The resin molding apparatus 10 includes a cutting member 50 capable of cutting the molten resin M, which is filled into the mold 30 before curing. The cutting member 50 is a plate-shaped metal component that can slide relative to the mold 30 (see reference). Figure 1 A, Figure 1(B) can be retracted while filling molten resin M (see reference) Figure 2 (B) The method of advancing towards the main body 40 when cutting the molten resin M (see reference) Figure 3 A) Advance and retraction. The cutting component 50 can advance and retract in a direction that intersects with the opening and closing direction of the mold 30 (a direction other than the up and down direction, such as the left and right direction, which is approximately perpendicular to the opening and closing direction).

[0028] The drive mechanism (not shown) that moves the cutting member 50 forward and backward can be, for example, a device equipped with a hydraulic cylinder for forward movement and a compression coil spring for backward movement. Furthermore, as long as the cutting member 50 can move forward and backward, its structure is arbitrary, such as a cylinder, an electric motor, or a manual mechanism. A drive mechanism with a sliding core corresponding to the undercut shape of the resin molded article 20 can also be used.

[0029] The end portion 51 of the cutting member 50 has: a cutting portion 52 that cuts off the boundary 14 between the main body portion 40 and the gate filling portion 12; a first extension portion 53 that extends from the rear end portion 52b of the cutting portion 52 toward the front side (upward); and a planar first sliding portion 54 that extends from the first extension portion 53 in the rearward direction and is capable of sliding relative to the sliding surface 31a of the moving mold 31.

[0030] Reference Figure 2 A. The first sliding part 54 of the cutting component 50 and the sliding surface 31a of the moving mold 31 are located on the same plane as the mold closing surface 30b (parting line) of the fixed mold 32 and the moving mold 31.

[0031] (Cut-off section 52)

[0032] Reference Figure 3 A. The cut-off portion 52 is a planar portion facing approximately the front (upper) side, with the front and back sides of the main body portion 40 as a reference. During cutting, the back side 45 of the end 43 of the main body portion 40 is formed. The back side 45 can also be called the cut surface. The cut-off portion 52 may also be slightly lower in the front and higher in the back (sloping towards the back side as it moves in the forward direction).

[0033] Reference Figure 2 B and Figure 3 A. The first extension 53 extends from the rear end 52b of the cut portion 52 toward the oblique front rear (oblique upper right), and presses in a portion m of the molten resin M located on the side of the main body portion 40 when the cut portion 52 cuts the boundary 14.

[0034] The first extension 53 forms a portion of the side surface 46 of the end 43 during cutting (a second side 46c on the back side of the side surface 46, which is further back than the top 46a). During this forming, the first extension 53 is connected to the moving mold 31 without any steps. Alternatively, the first extension 53 may extend only towards the front side (directly upward). It is also possible to omit the first extension 53 and have the cutting portion 52 and the first sliding portion 54 located on the same plane.

[0035] The cutting member 50 also includes: a second extension 55 that extends from the end portion 52a of the cutting member 52 toward the back side (downward); and a planar second sliding portion 56 that extends from the second extension 55 in the rearward direction and is capable of sliding relative to the sliding surface 32a of the fixed mold 32.

[0036] The second extension 55 extends from the end portion 52a of the cut portion 52 in a rearward direction (slightly downward to the right). That is, the cut member 50 has a sharp shape with the end portion 52a of the cut portion 52 as its apex. Alternatively, the second extension 55 may extend only in the rearward direction (directly downward).

[0037] Reference Figure 2 A and Figure 2 B.

[0038] The first resin molding device 10 includes:

[0039] A mold 30 has a molding space 30a capable of forming a resin molded article 20 and a gate 33 serving as an inlet for molten resin M to flow into the molding space 30a. The mold 30 can form a main body 40 and a gate-filling portion 12. The main body 40 is filled with molten resin M in the molding space 30a, and the gate-filling portion 12 is filled with molten resin M in the gate 33.

[0040] The cutting component 50 has a cutting portion 52, which can cut the boundary 14 by moving forward and backward relative to the boundary 14 between the end 43 of the main body 40 and the gate filling portion 12. When cutting the boundary 14, the cutting component 50 can form the main body 40 together with the mold 30.

[0041] The end 43 of the main body 40 and the gate filling part 12 are connected in the opening and closing direction (vertical direction) of the mold 30 via the boundary 14.

[0042] The cutting component 50 can move forward and backward in a direction intersecting the opening and closing direction of the mold 30 to cut the boundary 14.

[0043] Reference Figure 4According to the above structure, the cut surface 45 of the end 43 faces the back side. Since the cut surface 45 (back side 45) is difficult to see, the resin molding apparatus 10 can be provided to improve the aesthetics of the resin molded article 20.

[0044] Reference Figure 2 B. Second, in the first resin molding apparatus 10, the end portion 52a of the cutting portion 52 is sharp. During cutting, the burden applied to the cutting member 50 can be reduced. There are fewer burrs adhering to the main body portion 40. The fixed mold 32 can also be made sharp, but the maintainability of the resin molding apparatus 10 is good when the cutting member 50 is made sharp.

[0045] Third, in the first or second resin molding apparatus 10, there is a first extension 53 extending from the rear end portion 52b of the cutting portion 52 toward the direction where the thickness of the cutting member 50 increases (front side). When the boundary 14 is cut using the cutting member 50, the first extension 53 can press a portion m of the molten resin M toward the main body portion 40, so that the top 26a of the side surface 26 of the resin molded article 20 does not become stepped, and the aesthetics of the resin molded article 20 can be further improved.

[0046] Fourth, the resin molded article 20 can be molded by using any of the first to third resin molding devices 10.

[0047] Reference Figure 2 A. The first sliding portion 54 of the cutting component 50 is located on the same plane as the mold parting surface 30b (parting line). (See reference...) Figure 3 B. With the mold 30 open, the first sliding part 54 of the cutting component 50 is exposed. This facilitates the inspection of the cutting component 50 and its replacement when worn. Furthermore, the length of the cutting component 50 in the forward and backward directions can be adjusted appropriately.

Claims

1. A resin molding apparatus, comprising: A mold having a molding space capable of forming a resin molded article and a gate serving as an inlet for molten resin to flow into the molding space, and capable of forming a main body and a gate-filling portion, wherein the main body is the molten resin filling the molding space and the gate-filling portion is the molten resin filling the gate; and A cutting component has a cutting portion capable of cutting off a boundary by moving forward and backward relative to the boundary between the end of the main body and the gate filling portion. When cutting off the boundary, the cutting component can form the main body together with the mold. The end portion of the main body and the gate filling portion are connected in the opening and closing direction of the mold via the boundary. The cutting component is capable of moving forward and backward in a direction intersecting the opening and closing direction of the mold to cut the boundary.

2. The resin molding apparatus according to claim 1, wherein, The end of the cut portion is sharp.

3. The resin molding apparatus according to claim 1, wherein, The resin molding apparatus has a first extension that extends from the rear end of the cutting portion toward the direction in which the thickness of the cutting member increases.

4. A resin molded article, which is molded using the resin molding apparatus according to any one of claims 1 to 3.

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