CN113459431B - Injection molding die - Google Patents
Injection molding die Download PDFInfo
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- CN113459431B CN113459431B CN202110330868.8A CN202110330868A CN113459431B CN 113459431 B CN113459431 B CN 113459431B CN 202110330868 A CN202110330868 A CN 202110330868A CN 113459431 B CN113459431 B CN 113459431B
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- molten resin
- breaking
- injection molding
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- forming surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
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- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A mold for injection molding, which forms a resin matrix having a surface subjected to plating treatment by molding a molten resin; the injection molding die has a design surface forming a design surface of the resin substrate and a back surface forming a back surface of the design surface of the resin substrate; the back surface forming surface is provided with a film breaking protrusion extending in a direction intersecting a main flow direction of the molten resin in a space between the design surface forming surface and the back surface forming surface and protruding toward the design surface forming surface, and the film breaking protrusion breaks a surface film of the molten resin.
Description
Technical Field
The present invention relates to a mold for injection molding.
Background
Conventionally, resin molded articles having been subjected to plating treatment on the surfaces thereof have been used for exterior parts for vehicles. In such a vehicle exterior member, a resin base is formed by supplying a molten resin into an injection molding die and cooling the molten resin, and a metal thin film is formed on the surface of the resin base by a plating process. For example, patent document 1 discloses a technique as follows: a groove is formed in the surface of the mold, and the flow of the molten resin in the groove is changed to suppress the formation of a brittle layer on the surface of the molten resin, thereby improving the adhesion strength of the plating layer to the resin substrate.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2015-142968
However, the invention disclosed in patent document 1 is a technique for suppressing formation of a fragile layer by changing the flow of a molten resin, and cannot cope with a fragile layer that has already been formed. Therefore, if a fragile layer is formed on the surface of the molten resin before reaching the groove portion, the fragile layer may remain on the surface layer of the resin base.
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made in view of the above-described problems, and an object of the present invention is to: in a mold for injection molding, which forms a resin substrate having a surface subjected to plating treatment, a phenomenon in which a fragile layer remains on the surface layer of the resin substrate is suppressed.
Means for solving the problems
The present invention adopts the following technical scheme as means for solving the above problems.
A first aspect of the present invention is an injection molding die for forming a resin base body having a surface subjected to plating treatment by molding a molten resin, the injection molding die having a design surface forming a design surface of the resin base body and a back surface forming a back surface of the design surface of the resin base body; the back surface forming surface is provided with a film breaking protrusion extending in a direction intersecting a main flow direction of the molten resin in a space between the design surface forming surface and the back surface forming surface and protruding toward the design surface forming surface, and breaking a surface film of the molten resin.
In a second aspect of the present invention, the rupture disk protrusion is formed so that a tip end thereof is pointed when viewed in a direction along the extending direction of the rupture disk protrusion.
In a third aspect of the present invention, in the first or second aspect, a plurality of the rupture projections are arranged in a main flow direction of the molten resin.
In a fourth aspect of the present invention, in any one of the first to third aspects, a membrane-breaking groove portion is provided on the back surface forming surface, the membrane-breaking groove portion being disposed adjacent to the membrane-breaking protrusion in the main flow direction of the molten resin and being recessed in a direction opposite to the design surface forming surface.
In a fifth aspect of the present invention, in the fourth aspect, two membrane-breaking protrusions are disposed adjacent to each other so as to sandwich one membrane-breaking groove in a main flow direction of the molten resin.
In a sixth aspect of the present invention, the rupture groove portion is formed so that a bottom portion thereof is pointed in a direction opposite to the design surface forming surface when viewed in a direction along the extending direction of the rupture protrusion.
Effects of the invention
In the present invention, a film breaking protrusion for breaking a surface film of a molten resin is provided on a back surface forming surface of an injection molding die for forming a back surface of an exterior design surface. Therefore, according to the present invention, the surface coating of the molten resin is broken by the rupture projections as the molten resin flows. As described above, according to the present invention, the surface coating film to be or having become the fragile layer can be broken by the rupture protrusion, and the fragile layer can be prevented from remaining on the surface layer of the resin base.
Drawings
Fig. 1 is a perspective view of a resin substrate molded by an injection molding die according to an embodiment of the present invention.
Fig. 2A is an enlarged schematic main part cross-sectional view of an injection molding die of an embodiment of the present invention.
Fig. 2B is an enlarged view of the area a of fig. 2A.
Fig. 3A is a schematic view showing a flow condition of a molten resin of an injection molding die according to an embodiment of the present invention.
Fig. 3B is a schematic view showing a flow condition of a molten resin of an injection molding die according to an embodiment of the present invention.
Fig. 3C is a schematic view showing a flow condition of a molten resin of an injection molding die according to an embodiment of the present invention.
Fig. 4A is a schematic enlarged cross-sectional view of a membrane-breaking portion provided in a modification of the injection molding die according to the embodiment of the present invention.
Fig. 4B is a schematic enlarged cross-sectional view of a membrane-breaking portion provided in another modification of the injection mold according to the embodiment of the present invention.
Detailed Description
An embodiment of the injection molding die of the present invention will be described below with reference to the drawings.
Fig. 1 is a perspective view of a resin base 10 molded by an injection molding die according to the present embodiment. The resin base 10 is a member for forming a vehicle exterior member by plating the surface, and is formed of a resin. Such a resin base 10 is formed of, for example, ABS resin or a mixed resin of ABS and polycarbonate.
The shape of the resin base 10 may be arbitrarily changed according to the shape of the exterior member for a vehicle. However, since the exterior member for a vehicle is a member that can be seen from the outside of the vehicle, at least a part of the resin base 10 is provided with a design surface located on the side that is recognized from the outside.
Fig. 1 is a perspective view of a resin base 10 identified from the side opposite to the design surface. As shown in the figure, in the present embodiment, the resin base 10 has a design wall 11 and two side walls 12, the design wall 11 having a design surface 11a, the two side walls 12 being connected to ends of the design wall 11.
As shown in fig. 1, the resin base 10 is an elongated member extending linearly. The design wall 11 is a long plate-like wall portion extending along the extending direction of the resin base 10, and has an outer surface 11a and an inner surface 11b. The design surface 11a is a surface that is recognized from the outside in a state where the exterior member for a vehicle is mounted on the vehicle. The rear surface 11b is a surface facing the vehicle side in a state where the vehicle exterior member is mounted on the vehicle, and is a surface that is not visible from the outside.
In the present embodiment, the design surface 11a is a flat surface having no irregularities. On the other hand, the back surface 11b is provided with a plurality of segments 20 arranged in the longitudinal direction of the design wall 11 (the extending direction of the resin base 10). That is, the back surface 11b has irregularities. Each of the segments 20 is formed to have a length from one side wall 12 to the other side wall 12, and linearly extends in the short side direction of the design wall 11 (the direction orthogonal to the extending direction of the resin base 10 and along the rear surface 11b, i.e., the width direction of the resin base 10).
The side wall 12 is a wall portion that is connected to the edge portion of the design wall 11 in the short side direction in a curved manner. The two side walls 12 are connected in an opposing manner to the design wall 11. The resin base 10 having such a design wall 11 and two side walls 12 has a substantially U-shape in cross section.
Such a resin base 10 suppresses formation of a brittle layer of a surface layer by breaking a surface film of a molten resin at the time of injection molding. Therefore, the adhesive strength of the plating layer to the resin base 10 can be improved based on the resin base 10 of the present embodiment. In addition, when the molten resin contains butadiene particles, as will be described later, the molten resin having high fluidity overflows to the surface layer due to the breakage of the surface coating film, and the deformation of the butadiene particles is suppressed, so that deep holes can be formed in the resin matrix 10 by the dissolution treatment of the butadiene particles after injection molding. Therefore, the anchoring effect of the plating layer can be improved, and the adhesion strength of the plating layer can be further improved.
Next, a method of forming such a resin matrix 10 will be described with reference to fig. 2A to 3C.
Fig. 2A is a schematic enlarged view of a main part of the injection molding die 1 used when the resin base 10 is formed by injection molding. Fig. 2B is an enlarged view of the area a in fig. 2A. As shown in fig. 2A, the injection molding die 1 includes a core die 2 and a cavity die 3.
The core mold 2 has a back surface forming surface 2a that forms a back surface 11b of the design wall 11 of the resin base 10. The cavity mold 3 has a design surface forming surface 3a that forms a design surface 11a of the design wall 11 of the resin base 10. The injection molding die 1 has a cavity space C into which a molten resin P (see fig. 3A to 3C) flows between the back surface forming surface 2a of the core mold 2 and the design surface forming surface 3A of the cavity mold 3. The injection molding die 1 further includes a gate G for supplying the molten resin to the cavity C.
The cavity space C is a space for molding the resin base 10, and is a hollow space in a long shape conforming to the shape of the resin base 10. The left-right direction in fig. 2A and 2B is the longitudinal direction of the cavity space C. The gate G is connected to one end (left end in fig. 2A) of the cavity space C in the longitudinal direction. If the molten resin P is supplied from the gate G to such a cavity space C, the molten resin P flows along the longitudinal direction of the cavity space C. That is, in the present embodiment, the molten resin P flows from the left end portion toward the right end portion in fig. 2A of the cavity space C to which the gate G is connected. As described above, in the present embodiment, the longitudinal direction of the cavity C is the main flow direction of the molten resin P in the cavity C.
As shown in fig. 2A, in the injection molding die 1 of the present embodiment, a plurality of film breaking portions 4 are provided on the back surface forming surface 2A of the core mold 2, and the plurality of film breaking portions 4 are used to break the surface coating film P1 of the molten resin P. These membrane-breaking portions 4 are arranged along the longitudinal direction of the cavity space C, that is, the main flow direction of the molten resin P. As shown in fig. 2B, each membrane-breaking portion 4 has two membrane-breaking protrusions 4a and one membrane-breaking groove 4B.
The rupture protrusion 4a is a portion protruding from the reference surface (parting line) of the back surface forming surface 2a toward the design surface forming surface 3a of the cavity mold 3. The rupture protrusion 4a is provided so as to extend linearly in a direction perpendicular to the main flow direction of the molten resin P and along the back surface forming surface 2a (i.e., in the width direction of the cavity space C). The extending direction of the rupture protrusion 4a in the present embodiment is parallel to the width direction of the cavity space C. The rupture protrusion 4a is formed to have a tip end pointed when viewed in a direction along the extending direction thereof, and has a triangular shape with a top portion facing the design surface forming surface 3a when viewed in the same direction. In other words, the width of the rupture projection 4a in the flow direction becomes smaller as it goes toward the design surface forming surface 3a when viewed in the direction along the extending direction. The rupture protrusion 4a is formed in a convex strip shape extending in the width direction of the cavity space C.
Such a rupture protrusion 4a is disposed adjacent to the rupture groove 4b without any gap in the flow direction of the molten resin P. As shown in fig. 2B, the two rupture projections 4a are arranged upstream and downstream of the rupture groove 4B so as to sandwich the rupture groove 4B in the flow direction of the molten resin P. That is, two membrane-breaking protrusions 4a are adjacently arranged so as to sandwich one membrane-breaking groove 4b in the main flow direction of the molten resin P.
The membrane-breaking groove 4b is a groove recessed from the back surface forming surface 2a toward the opposite side of the design surface forming surface 3a.
The rupture groove portion 4b extends in the same direction as the extension direction of the rupture protrusion portion 4a. That is, the membrane-broken groove portion 4b is provided to extend linearly in a direction perpendicular to the main flow direction of the molten resin P and along the back surface forming surface 2a. The inner wall surface of the rupture groove part 4b is an inclined surface flush with the outer wall surface of the rupture protrusion part 4a.
In fig. 2A, 2B, and fig. 3A to 3C described later, the membrane-breaking portion 4 is enlarged and illustrated so as to be distinguishable. In practice, for example, the arrangement pitch of the membrane-breaking parts 4 is about several millimeters, the dimension of the membrane-breaking parts 4 in the main flow direction of the molten resin P is about several tens of micrometers, and the height dimension of the membrane-breaking protrusions 4a and the depth dimension of the membrane-breaking grooves 4b are about 10 micrometers.
The molten resin P flows into the cavity space C of the injection molding die 1 of the present embodiment from the gate G. Fig. 3A to 3C are schematic views showing a case where the molten resin P flows in the cavity space C of the injection molding die 1 of the present embodiment. As shown in fig. 3A, the molten resin P flows in the cavity space C from the left side toward the right side of the figure. A film (surface film P1) is formed on the surface of the molten resin P flowing in the cavity space C in this way due to cooling or the like in the cavity space C. The surface coating P1 is a fragile layer, and causes a decrease in adhesion strength of the plating layer to the resin base 10.
In addition, the density of the surface coating film P1 is higher than that of the inside of the molten resin P. Therefore, when the butadiene particles are contained in the molten resin P, the surface coating film P1 elongates the spherical butadiene particles to a flat shape along with the flow of the molten resin P. Accordingly, when butadiene particles are removed by oxidation and dissolution thereafter, the pores formed in the resin matrix 10 may become shallow, and the adhesion of the plating layer to the resin matrix 10 due to the anchoring effect may be reduced.
In contrast, in the present embodiment, as shown in fig. 3B, when the molten resin P that has generated the surface coating P1 reaches the membrane breaking portion 4, the membrane breaking protrusion 4a penetrates the surface coating P1, and breaks the surface coating P1. As a result, as shown in fig. 3C, the molten resin P having low viscosity inside breaks the surface coating film P1 and flows out. As a result, the molten resin P having a low viscosity, which is not cooled or the like, comes into contact with the design surface forming surface 3a and the back surface forming surface 2a, and the formation of the fragile layer is suppressed.
Further, the surface coating film P1 having a high density is broken, whereby the force of elongating the butadiene particles into a flat shape can be reduced. The molten resin P flows in the membrane-broken groove portion 4b so as to spread in a direction (vertical direction in fig. 3A to 3C) perpendicular to the design surface forming surface 3A and the back surface forming surface 2a. Therefore, the flow velocity of the molten resin P in the main flow direction can be reduced, and the force of elongating the butadiene particles into a flat shape can be reduced. In addition, the collision of the molten resin P with the membrane-breaking protrusions 4a can reduce the flow velocity of the molten resin P in the main flow direction, and can reduce the force of elongating the butadiene particles into a flat shape.
With the injection molding die 1 according to the present embodiment, the resin base 10 having good adhesion of the plating layer formed later can be formed. The injection molding die 1 of the present embodiment forms the resin base 10 having the surface subjected to the plating treatment by molding the molten resin P. The injection molding die 1 of the present embodiment has a design surface forming surface 3a and a back surface forming surface 2a, the design surface forming surface 3a forming the design surface 11a of the resin base 10, and the back surface forming surface 2a forming the back surface 11b of the design surface 11a of the resin base 10; the back surface forming surface 2a is provided with a film breaking protrusion 4a, and the film breaking protrusion 4a extends in a direction intersecting with a main flow direction of the molten resin P in a space between the design surface forming surface 3a and the back surface forming surface 2a, protrudes toward the design surface forming surface 3a, and breaks a surface coating P1 of the molten resin P.
With the injection molding die 1 of the present embodiment, the film-breaking protrusions 4a that break the surface film P1 of the molten resin P are provided on the back surface forming surface 2a of the back surface 11b that forms the design surface 11 a. Therefore, according to the injection molding die 1 of the present embodiment, as the molten resin P flows, the surface coating P1 of the molten resin P is broken by the breaking protrusions 4a. As described above, according to the injection molding die 1 of the present embodiment, the surface coating P1 to be or already the fragile layer can be broken by the rupture protrusion 4a, and the fragile layer can be prevented from remaining on the surface layer of the resin base 10.
In the injection molding die 1 of the present embodiment, the rupture protrusion 4a is formed so that its tip is pointed when viewed from the direction along the extending direction. Therefore, the surface coating P1 is easily pierced by the rupture protrusion 4a, and the rupture protrusion 4a can be more reliably ruptured.
In the injection molding die 1 of the present embodiment, a plurality of rupture projections 4a are arranged along the main flow direction of the molten resin P. Therefore, the adhesion strength of the plating layer to the resin base 10 can be improved in a wide area in the longitudinal direction of the cavity space C, that is, in the longitudinal direction of the resin base 10.
In the injection molding die 1 of the present embodiment, the back surface forming surface 2a is provided with the film breaking groove portion 4b, and the film breaking groove portion 4b is disposed adjacent to the film breaking protrusion portion 4a in the main flow direction of the molten resin P and is recessed in the direction opposite to the design surface forming surface 3a. Therefore, the flow rate of the molten resin P can be reduced by the membrane-breaking groove portion 4b, and flattening of the butadiene particles can be suppressed.
In the injection molding die 1 of the present embodiment, two membrane-breaking protrusions 4a are disposed adjacent to each other so as to sandwich one membrane-breaking groove 4b in the main flow direction of the molten resin P. Therefore, in a narrow range, the surface coating film P1 can be reliably broken by the two film breaking protrusions 4a, and the flow rate of the molten resin P can be reduced, so that the adhesion strength of the plating layer to the resin base 10 can be reliably improved in this range.
While the preferred embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the above embodiments. The various shapes, combinations, and the like of the arrangement members shown in the above embodiments are merely examples, and various modifications based on design requirements and the like may be made within the scope not departing from the gist of the present invention.
For example, in the above embodiment, the membrane-broken groove portion 4b is configured to have a bottom surface in a planar shape (for example, a planar shape parallel to the back surface forming surface 2 a). However, the present invention is not limited thereto. For example, as shown in fig. 4A, the following structural configuration may be adopted: the membrane-breaking groove portion 4b is formed so that the bottom portion is pointed in a direction opposite to the design surface forming surface 3a when viewed in a direction along the extending direction of the membrane-breaking protrusion portion 4a. In other words, the width of the rupture groove portion 4b in the flow direction may be smaller as it is farther from the design surface forming surface 3a when viewed in the direction along the extension direction of the rupture protrusion portion 4a. By adopting such a structural arrangement, the molten resin P flowing into the rupture groove portion 4b can be suppressed from bouncing back on the bottom surface, and the molten resin P can easily flow into the rupture groove portion 4b. Therefore, the flow rate of the molten resin P can be more reliably slowed down by the membrane-breaking groove portion 4b.
However, the present invention is not limited to the configuration in which the rupture groove portion 4b is provided. For example, as shown in fig. 4B, a configuration may be adopted in which the rupture groove portion 4B is not provided.
In the above embodiment, the rupture protrusion 4a extends in the direction orthogonal to the main flow direction of the molten resin P and along the back surface forming surface 2a (i.e., the width direction of the cavity space C), but the present invention is not limited to this structural arrangement. The rupture protrusion 4a may protrude toward the design surface forming surface 3a and extend in a direction intersecting the flow direction. For example, the rupture protrusion 4a may extend in a direction slightly inclined with respect to the back surface forming surface 2a.
In the above embodiment, the membrane-breaking protrusion 4a is formed so that the tip is pointed when viewed in the direction along the extending direction, but the present invention is not limited to this configuration. The rupture protrusion 4a may have a rectangular shape protruding toward the design surface forming surface 3a when viewed in the extending direction.
Description of the reference numerals
1: a mold for injection molding; 2: a core mold; 2a: a back forming surface;
3: cavity mold; 3a: forming a surface of the design surface; 4: a membrane rupture section;
4a: rupture of membranes protruding portion; 4b: rupture of membranes groove; 10: a resin matrix;
11: a design wall; 11a: an appearance design surface; 11b: a back surface;
12: a sidewall; 20: a segment; c: cavity space (space);
g: a gate; p: melting the resin; p1: and (5) surface coating.
Claims (5)
1. A mold for injection molding, which forms a resin matrix having a surface subjected to plating treatment by molding a molten resin, wherein,
the injection molding die has an appearance design surface forming surface and a back surface forming surface;
the design surface forming surface forms the design surface of the resin matrix;
the back forming surface forms the back of the design surface of the resin matrix;
a film-breaking protrusion provided on the back surface forming surface, the film-breaking protrusion extending in a direction intersecting a main flow direction of the molten resin in a space between the design surface forming surface and the back surface forming surface and protruding toward the design surface forming surface, and breaking a surface film of the molten resin;
the rupture protrusion is formed such that a tip end thereof is pointed when viewed in a direction along an extending direction thereof;
a film breaking groove portion is provided on the back surface forming surface, the film breaking groove portion being disposed adjacent to the film breaking protrusion in a main flow direction of the molten resin and being recessed in a direction opposite to the design surface forming surface;
an inner wall surface of the rupture groove part is an inclined surface flush with an outer wall surface of the rupture protrusion.
2. The injection molding die according to claim 1, wherein the rupture projections are arranged in a plurality along a main flow direction of the molten resin.
3. The injection molding die according to claim 1, wherein,
two membrane-breaking protrusions are disposed adjacent to each other so as to sandwich one membrane-breaking groove in the main flow direction of the molten resin.
4. The injection molding die according to claim 1, wherein,
the membrane-breaking groove portion is formed so that a bottom portion thereof is pointed in a direction opposite to the design surface forming surface when viewed in a direction along the extending direction of the membrane-breaking protrusion portion.
5. The injection molding die according to claim 3, wherein,
the membrane-breaking groove portion is formed so that a bottom portion thereof is pointed in a direction opposite to the design surface forming surface when viewed in a direction along the extending direction of the membrane-breaking protrusion portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-059289 | 2020-03-30 | ||
| JP2020059289A JP7466352B2 (en) | 2020-03-30 | 2020-03-30 | Injection mould |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113459431A CN113459431A (en) | 2021-10-01 |
| CN113459431B true CN113459431B (en) | 2023-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110330868.8A Active CN113459431B (en) | 2020-03-30 | 2021-03-26 | Injection molding die |
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| JP (1) | JP7466352B2 (en) |
| CN (1) | CN113459431B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002192575A (en) * | 2000-12-27 | 2002-07-10 | Ube Cycon Ltd | Method for manufacturing metallic resin molded object, mold for injection molding, and metallic resin molded object |
| JP4845180B2 (en) * | 2005-08-25 | 2011-12-28 | 森六テクノロジー株式会社 | Injection mold apparatus and injection molding method |
| JP4515483B2 (en) * | 2007-04-25 | 2010-07-28 | 小島プレス工業株式会社 | Decorative resin molded product manufacturing method and decorative resin molded product |
| JP6070592B2 (en) | 2014-01-31 | 2017-02-01 | 豊田合成株式会社 | Manufacturing method for resin injection molding dies and resin molded products |
| JP6437832B2 (en) * | 2015-01-23 | 2018-12-12 | 河西工業株式会社 | Synthetic resin molded product and molding method thereof |
| JP6770257B2 (en) | 2016-02-19 | 2020-10-14 | コニカミノルタ株式会社 | Manufacturing method of resin molded products, mirrors and molded products |
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Also Published As
| Publication number | Publication date |
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| CN113459431A (en) | 2021-10-01 |
| JP7466352B2 (en) | 2024-04-12 |
| JP2021154660A (en) | 2021-10-07 |
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