阅读说明：本技术 一种双色注塑模具及成型方法 (Double-color injection mold and molding method ) 是由 郑钟煌 李宙宏 朱捍卫 虞勇贤 于 2019-08-27 设计创作，主要内容包括：本发明公开一种双色注塑模具,包括动模、定模、滑块和安装底座,定模固定于安装底座上,滑块滑移运动于安装底座上,定模上设置有硬胶浇口,滑块上设置有软胶浇口,动模、定模和滑块之间形成有注塑腔,注塑腔包括硬胶腔和软胶腔,在安装底座靠近滑块的一端设置有一油缸,定模靠近滑块的一端设置有弹簧,滑块靠近或者远离定模分别受控于油缸和弹簧,该双色注塑模具能够避免由于软胶包紧力过大造成的脱胶困难或者软胶与硬胶分离的后果,降低模具制造成本,降低产品注塑成本,提高产品的生产效率。(The invention discloses a double-color injection mold, which comprises a movable mold, a fixed mold, a sliding block and an installation base, wherein the fixed mold is fixed on the installation base, the sliding block slides on the installation base, a ebonite sprue is arranged on the fixed mold, a soft glue sprue is arranged on the sliding block, an injection molding cavity is formed among the movable mold, the fixed mold and the sliding block, the injection molding cavity comprises a ebonite cavity and a soft glue cavity, an oil cylinder is arranged at one end of the installation base, which is close to the sliding block, a spring is arranged at one end of the fixed mold, which is close to the sliding block, and the sliding block, which is close to or far from the fixed mold, is respectively controlled by the oil cylinder and the spring.)

1. a double-color injection mold comprises a movable mold (2), a fixed mold (3), a slider (4) and an installation base (1), and is characterized in that the fixed mold (3) is fixed on the installation base (1), the slider (4) slides on the installation base (1), a ebonite sprue (7) is arranged on the fixed mold (3), a soft rubber sprue (8) is arranged on the slider (4), an injection molding cavity (11) is formed among the movable mold (2), the fixed mold (3) and the slider (4), the injection molding cavity (11) comprises a ebonite cavity (1101) and a soft rubber cavity (1102), an oil cylinder (6) is arranged at one end of the installation base (1) close to the slider (4), a spring (10) is arranged at one end of the fixed mold (3) close to the slider (4), the slider (4) close to or far away from the fixed mold (3) is respectively controlled by the oil cylinder (6) and the spring (10), when the die is closed, a piston rod of the oil cylinder (6) extends out, the sliding block (4) props against the fixed die (3) and seals the soft rubber cavity (1102), and at the moment, hard rubber is injected; after the piston rod of the oil cylinder (6) retracts, the sliding block (4) retreats to prop against the movable mold (2) and expose the soft glue cavity (1102), and at the moment, soft glue is injected; when the mold is opened, the slide block (4) retreats again under the action of the return spring (10), and at the moment, the soft glue is demoulded.

2. A two-shot injection mold according to claim 1, wherein a slide (5) is fixed on said mounting base (1), said slide (5) is provided with a sliding groove, and said slide (4) is engaged and slid in said sliding groove.

3. Two-color injection mold according to claim 2, characterized in that the cross-sectional shape of the runner is an inverted T-shape or a trapezoid.

4. a two-shot moulding die according to any one of claims 1 to 3 wherein the end of the slide (4) adjacent the stationary die (3) is recessed with a receiving groove (9), and the spring (10) is fixedly connected to the bottom of the receiving groove (9) and the stationary die (3), respectively.

5. A two-shot moulding mould according to claim 4, characterised in that the mounting base (1) comprises a horizontal base (101) and a vertical mounting (102) at one end, the cylinder (6) being fixed to the vertical mounting (102) and the piston rod passing through the vertical mounting (102) when extended abutting the slide (4).

6. double-shot injection mold according to claim 5, characterized in that the cylinder (6) is a self-locking cylinder (6).

7. a two-shot injection molding method comprising the two-shot injection mold according to claim 6, characterized by comprising the steps of:

(1) During injection molding, a piston rod of the oil cylinder (6) extends out, the piston rod penetrates through the through groove and then pushes the sliding block (4) to advance until the sliding block abuts against the fixed die (3), and the soft rubber cavity (1102) is closed;

(2) the movable mold (2) and the fixed mold (3) are assembled, a gap exists between the sliding block (4) and the movable mold (2), at the moment, hard glue is injected into the hard glue cavity (1101) through the hard glue gate (7), and the movable mold is static for a moment to wait for the hard glue to be dried completely;

(3) A piston rod of the oil cylinder (6) retracts, the sliding block (4) slides backwards and abuts against the movable mold (2) under the action of the spring (10), the soft rubber cavity (1102) is opened, at the moment, soft rubber is injected into the soft rubber cavity (1102) through the soft rubber pouring gate (8), and the soft rubber is kept still for a moment and waits for the soft rubber to dry;

(4) And opening the movable mold (2) and the fixed mold (3), and retreating the sliding block (4) again under the action of the spring (10) to demould one side of the soft rubber.

Technical Field

The invention relates to the field of injection molds, in particular to a double-color injection mold and a molding method.

Background

The double-color injection molding refers to a molding process in which two different materials are injected into the same set of mold, so that the injection molded part is formed by the two materials. Many plastic products, especially interior products of automobiles, need to be made with a layer of soft glue in hard plastics due to requirements of sound insulation, sealing and the like, and the shape of the soft glue can be various, so that the products need to be applied to a double-color injection molding process.

The existing double-color mold is generally solved by 2 pairs of molds through a rotating mode, for example, a fixed mold two-process interchange double-color injection mold and a molding method disclosed in the Chinese patent with the application number of CN201610857845.1 are provided with a rotating mechanism in a mold cavity, and after a product is ejected out, the product is rotated by 180 degrees to realize the position exchange of an upper fixed mold and a lower fixed mold, so that the two-step injection molding process is completed in one pair of molds to realize double-color injection molding, but the whole structure is complex and the cost is higher.

In the demolding process, the problem of difficult demolding or tearing with the hard glue can also exist due to the large wrapping force of the soft glue.

Disclosure of Invention

The invention aims to provide a double-color injection mold which is simple in structure and smooth in demolding.

the purpose is achieved by the following technical means: a double-color injection mold comprises a movable mold, a fixed mold, a sliding block and an installation base, wherein the fixed mold is fixed on the installation base, the sliding block slides on the installation base, a hard glue pouring gate is arranged on the fixed mold, a soft glue pouring gate is arranged on the sliding block, an injection molding cavity is formed among the movable mold, the fixed mold and the sliding block, the injection molding cavity comprises a hard glue cavity and a soft glue cavity, an oil cylinder is arranged at one end, close to the sliding block, of the installation base, a spring is arranged at one end, close to the sliding block, of the fixed mold, the sliding block is close to or far away from the fixed mold and controlled by the oil cylinder and the spring respectively, when the mold is closed, a piston rod; after the piston rod of the oil cylinder retracts, the sliding block retreats to prop against the movable mold and expose the soft rubber cavity, and at the moment, soft rubber is injected; when the mold is opened, the slide block retreats again under the action of the return spring, and at the moment, the soft rubber is demoulded.

The method is further optimized as follows: a sliding seat is fixed on the mounting base, a sliding groove is formed in the sliding seat, and the sliding block is embedded in the sliding groove and slides in the sliding groove.

the method is further optimized as follows: the cross section of the sliding groove is in an inverted T shape or a trapezoid shape.

The method is further optimized as follows: and one end of the sliding block, which is close to the fixed die, is sunken with an accommodating groove, and the spring is fixedly connected with the bottom of the accommodating groove and the fixed die respectively.

The method is further optimized as follows: the mounting base comprises a horizontal base and a vertical mounting seat at one end, and the oil cylinder is fixed on the vertical mounting seat and penetrates through the vertical mounting seat to be abutted against the sliding block when the piston rod extends out.

The method is further optimized as follows: the oil cylinder is a self-locking oil cylinder.

the invention also comprises a core two-procedure interchange double-shot injection molding method, which comprises the following steps:

(1) During injection molding, a piston rod of the oil cylinder extends out, the piston rod penetrates through the through groove and then pushes the sliding block to move forward to abut against the fixed die, and the soft rubber cavity is closed;

(2) the movable mold and the fixed mold are assembled, a space exists between the sliding block and the movable mold, at the moment, the hard rubber is injected into the hard rubber cavity through the hard rubber pouring gate, and the movable mold and the fixed mold are static for a moment to wait for the hard rubber to be dried completely;

(3) A piston rod of the oil cylinder retracts, the sliding block slides backwards and abuts against the movable mold under the action of the spring, the soft rubber cavity is opened, at the moment, soft rubber is injected into the soft rubber cavity through the soft rubber pouring gate, and the oil cylinder is kept still for a moment and waits for the soft rubber to dry;

(4) And opening the movable mold and the fixed mold, and retreating the sliding block again under the action of the spring to demould one side of the soft rubber.

Compared with the prior art, the invention has the advantages that: the sliding block moves in three steps in the whole injection molding period, namely, moves forwards once and retreats twice, and the sliding block retreats for the second time after the mold is opened to enable the single side of the soft rubber to be degummed under the action of the spring, so that the wrapping force of the soft rubber is reduced, and the degummed difficulty or the result of separation of the soft rubber and the hard rubber caused by overlarge wrapping force of the soft rubber is avoided; the injection molding of two materials is realized by only adopting one mold, the whole structure is simple, and compared with the prior art which adopts 2 pairs of molds or a structure and a complex mold, the manufacturing cost of the mold is greatly reduced; the tonnage of the required injection molding machine is reduced, the injection molding cost is reduced, the injection molding period is shortened, and the production efficiency of products is improved.

Drawings

FIG. 1 is a schematic view of a two-shot injection mold of this embodiment before injection molding;

fig. 2 is a schematic diagram of the two-color injection mold in the embodiment after the soft rubber cavity is closed;

Fig. 3 is a schematic diagram of the two-color injection mold in the embodiment after the soft rubber cavity is opened when the mold is closed;

FIG. 4 is a schematic view of the two-color injection mold according to the present embodiment when the mold is opened after injection molding;

FIG. 5 is an enlarged view of A in FIG. 4;

Fig. 6 is a schematic view of an injection molded product in this embodiment.

In the figure, 1, a base is installed; 101. a horizontal base; 102. a vertical mounting base; 2. moving the mold; 201. injecting glue holes; 3. fixing a mold; 4. a slider; 5. a slide base; 6. an oil cylinder; 7. a hard rubber gate; 8. a soft rubber gate; 9. a containing groove; 10. a spring; 11. an injection molding cavity; 1101. a hard rubber cavity; 1102. a soft rubber cavity.

Detailed Description

The invention will be further described by means of specific embodiments, which are given by way of illustration only and are not intended to limit the scope of the invention.