CN107791460A - The injection mold of built-in mixed flow - Google Patents

Abstract

The invention provides an injection mold with built-in mixed flow, which belongs to the technical field of injection molding processing. It solves the existing technical problems such as uneven temperature of molten material entering the mold cavity. The injection mold with built-in mixed flow includes a mold body. A cavity for product molding and a flow channel for receiving external plastic melt are arranged in the mold body. A gate for communication is provided between the flow channel and the cavity. There is a spoiler column inside the gate, which is characterized in that the spoiler column is located in the middle of the gate width direction, and the spoiler column divides the inner space of the gate into two branches for the plastic melt to flow through, and the discharge of the two branches The gates are relatively close to each other, and the outlets of the two branches meet at the connection between the gate and the cavity. The inner turbulence column of the invention can make the plastic melt flow mixed and make the temperature uniform.

Description

Injection mold with built-in mixed flow

technical field

The invention belongs to the field of injection molding processing, in particular to an injection mold with built-in mixed flow.

Background technique

Plastic products are widely used in people's production and life due to their low cost, durability and other advantages. Many of these plastic parts are produced using the injection molding process. The injection molding process is to create a cavity in the injection mold that is consistent with the shape of the plastic part to be produced, and the injection mold usually consists of two. During injection molding, the injection mold is installed on the injection molding machine, and the injection molding machine injects molten plastic into the flow channel of the mold. inside the mold cavity, and then cooled and formed in the mold cavity, and then the injection mold is opened, and the injection molded product can be ejected smoothly.

When the plastic in the molten state flows in the runner, because the peripheral plastic is in direct contact with the outer wall of the runner, the temperature of the peripheral plastic is a little lower than that of the middle plastic, so that in the plastic that flows into the mold cavity through the gate, the plastic The temperature distribution of the mold is not very uniform, and it is easy to cause obvious flow marks on the outer wall of the molded product during the flow in the mold cavity, resulting in substandard product quality.

The Chinese patent with the existing notification number CN20660575U discloses an improved mold glue inlet, which includes a glue inlet body, at least a plurality of spoiler protrusions are arranged in the glue inlet body, and the spoiler protrusions are hemispheres type or semi-cylindrical, but it can only alleviate the impact of the melt, and cannot effectively solve the effect of uneven temperature of the melt.

Contents of the invention

The present invention aims at the above-mentioned problems existing in the prior art, and provides an injection mold with a built-in mixed flow. The technical problem to be solved by the present invention is: how to keep the temperature of the molten material entering the mold cavity uniform.

The purpose of the present invention can be achieved through the following technical solutions:

An injection mold with built-in mixed flow, including a mold body, a mold cavity for product molding and a flow channel for receiving external plastic melt are arranged in the mold body, and a communication channel is provided between the flow channel and the cavity. The gate is provided with a spoiler column in the gate, which is characterized in that the spoiler column is located in the middle of the width direction of the gate, and the spoiler column divides the inner space of the gate into two parts for the plastic melt to flow through. There are two branches, the outlets of the two branches are relatively close to each other, and the outlets of the two branches meet at the connection between the gate and the mold cavity.

When the plastic melt flows from the runner into the gate, the spoiler column in the middle can divide the plastic melt from the middle, so that the melt in the middle of the plastic melt will flow toward the spoiler column after hitting the spoiler column. Diffusion on both sides. During the diffusion process, the melt in the middle will mix with the melt on both sides, and then mix with each other. Afterwards, since the outlets of the branches are relatively inclined, the plastic melts flowing through the branches are obliquely opposed to each other at the position of the outlets, and they are fully mixed again during the process of hedging. At the same time, the mixing point is located at the communication position between the gate and the mold cavity, and the mixed plastic melt directly enters the mold cavity to avoid cooling again in the runner. In this way, the temperature of the plastic melt that finally flows into the mold cavity is relatively uniform, and flow marks are not easy to appear on the surface of the product. At the same time, the entire spoiler structure is simple, and only local processing at the gate is required, and the effect is more obvious.

In the above-mentioned injection mold with built-in mixed flow, the number of the spoiler column is one, the spoiler column is prism-shaped, and the edge of the spoiler column is facing the connection between the gate and the runner. The plastic melt in the flowing state hits the spoiler prism, which is easy to be cut into two streams of fluid. At the same time, the melt can be directly separated at the cutting place without forming a circle, ensuring the rapid and stable flow of the fluid and ensuring the injection molding efficiency. One spoiler column can stably form two branches, so the structure is simple and easy to process.

In the above-mentioned injection mold with built-in mixed flow, both sides of the gate are concave surfaces adapted to the outer surface of the spoiler column, and the concave surface and the side wall of the spoiler column jointly form two arc-shaped branches. The structure of the concave surface can ensure that there is a large enough space in the branch channel for the plastic melt to flow through, so as to avoid blockage. The arc-shaped branch can make the molten material form a stable hedging angle at the outlet of the branch, ensuring the stability of the molten material during flow.

In the above-mentioned injection mold with built-in mixed flow, the two branch structures are arranged symmetrically about the center. Two branches with symmetrical structures can separate the flow, and then two equal amounts of melt materials at the outlet ends of the two branches are mixed with each other, which can maximize the internal mixed flow when converging and ensure the internal temperature of the plastic melt of evenness.

In the above-mentioned injection mold with built-in mixed flow, a cooling well for accommodating the front cold material of the plastic melt is provided at the communication place between the gate and the runner. The front part of the plastic melt in each round of injection molding is the front cold material, and the cooling well is a cavity that can accommodate part of the plastic melt. The cold plastic melt is stored to prevent its influence from entering the mold cavity and affecting injection molding. And let the plastic melt with stable temperature continue to enter the mold cavity through the gate to ensure the injection molding quality of the product.

In the above-mentioned injection mold with built-in mixed flow, multiple gates are connected to each mold cavity, and the end of the runner used to communicate with the gates has a buffer zone for flow diversion, and the gates are all connected to the buffer zone. The plastic melt flowing from the runner can pass through the internal buffer of the buffer zone, mix with each other, and then enter the gate one by one and mix again, which can further improve the uniformity of the temperature of the plastic melt entering the mold cavity.

In the above-mentioned injection mold with built-in mixed flow, an ejector rod for ejecting the condensed plastic in the runner is arranged in the buffer zone. After one injection molding is completed, the plastic in the runner and the cavity will be cooled and formed, and the ejector rod can generate the pushing force of the product, and then push out the plastic in the runner, which is convenient for the next injection. Moreover, the force application point of the ejector rod is located in the buffer zone. The plastic area in the buffer zone is relatively large, and the ejection force can be fully dispersed to ensure that the product can be ejected stably.

Compared with the prior art, the present invention has the following advantages:

1. The plastic flowing in from the outside can be fully mixed in the gate, and then the temperature of the plastic melt flowing into the cavity is even, and the quality of the injection molded product is better.

2. The overall structure is simple, the processing cost is low, and the effect is good.

Description of drawings

Fig. 1 is a structural schematic diagram of this embodiment.

Fig. 2 is a partial enlarged view of A in this embodiment.

In the figure, 1. mold body; 11. cooling well; 2. runner; 21. buffer zone; 22. ejector rod; 3. mold cavity; 4. gate; 41. concave surface; , the inlet port; 422, the outlet port; 5, the spoiler column.

Detailed ways

The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

As shown in Figure 1, an injection mold with a built-in mixed flow includes a mold body 1, a mold cavity 3 and a runner 2 are arranged inside the mold body 1, and both the mold cavity 3 and the runner 2 are arranged on the parting surface of the mold body 1 Above all, the two mold bodies 1 are butted against each other to form a complete and sealed mold cavity 3 and flow channel 2 inside. The shape of the mold cavity 3 is consistent with the shape of the plastic product to be processed. During the injection molding process, the flow channel 2 is connected to the external injection molding machine, and the plastic melt from the outside can enter the cavity 3 through the flow channel 2. Cool and shape.

As shown in FIG. 2 , a buffer zone 21 is connected to the end of the runner 2 , and a plurality of gates 4 communicating with the mold cavity 3 are opened on the buffer zone 21 . The buffer zone 21 has a large volume, and the plastic melt flowing from the runner 2 first enters the buffer zone 21, and the plastic melt is buffered, flowed and mixed in the buffer zone 21, and enters the cavity 3 from different gates 4 respectively. . An ejector rod 22 is arranged in the buffer zone 21, and the ejector rod 22 is connected with an external drive member, and it can freely expand and contract. During injection molding, the top surface of the ejector rod 22 is flush with the surface in the buffer zone 21. When the injection molding is completed and the plastic is cooled and formed, the ejector rod 22 is pushed out to eject the product in the runner 2.

Wherein, a cooling well 11 is provided on the side wall where the gate 4 communicates with the runner 2, and each gate 4 is correspondingly provided with a cooling well 11, and the front of the plastic melt flowing from the runner 2 is easy to flow during the flow process. Lower the temperature to form a cold material, which will affect the injection quality of the product when the cold material enters the mold cavity 3. Through the structure of the cooling well 11, the forward cold material of the plastic melt enters the cooling well 11, so that the subsequent plastic with stable temperature can Continue to enter the inside of the mold cavity 3 to fill the inside of the mold cavity 3 .

As shown in Figure 2, a spoiler column 5 is provided at the center of each gate 4, and the spoiler column 5 is a quadrangular prism structure with a diamond-shaped cross section, wherein the two side walls of the gate 4 are provided with concave surfaces 41 , the shape of the concave surface 41 corresponds to the shape of the side wall of the spoiler 5 . The spoiler column 5 divides the space in the gate 4 into two left and right branches 42, the two sides of the branch 42 are the concave surface 41 of the gate 4 and the side wall of the spoiler column 5 respectively, and the concave surface of the gate 4 41 corresponds to the shape of the side wall of the spoiler column 5 and the distance between the two is consistent, so that the width of each position inside the branch channel 42 formed in this way is equal, thereby ensuring that the plastic melt can flow smoothly and avoiding the occurrence of The situation of clogging.

The two ends of the branch 42 are the inlet port 421 and the outlet port 422 respectively. The inlet port 421 is located at the connection between the gate 4 and the buffer cavity, and the outlet ports 422 of the two branches 42 meet at the junction of the gate 4 and the cavity 3. connection. The inlet ends 421 of the two branches 42 have the same width. The molten materials coming out of the outlets 422 of the two branches 42 converge at an angle not equal to 0, preferably at an angle of 45°-90°, so that the mixing is most sufficient without affecting the flow of the molten material.

The two branches 42 are ring-shaped as a whole, and the two branches 42 are arranged symmetrically with each other, and the widths are equal. When the plastic melt enters the gate 4, it first hits the spoiler column 5, and the spoiler column 5 divides the plastic melt, and the plastic melt enters two equal branch channels 42, and the branch channel 42 The inner width is uniform, the flow of plastic melt is stable, and there will be no clogging. Simultaneously, the two branches 42 meet at last, and the plastic melt appears mixed flow again, so that the outer peripheral plastic melt with lower temperature and the higher intermediate temperature plastic melt can be uniformly mixed, and finally enter the mold cavity 3 .

During the injection molding process, the front cold material of the plastic melt can be stored in the cooling well 11 to prevent it from affecting the quality of the injection molded product. The plastic melt that is continuously fed in the runner 2 undergoes a large-scale buffer mixing in the buffer zone 21, and finally enters the gate 4. In the gate 4, the spoiler column 5 diverts the central fluid of the plastic melt Segmentation and then mixing are carried out, so that the temperature of the plastic melt entering the mold cavity 3 is relatively balanced, and the products injected are relatively stable.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Although this article uses more 1. mold body; 11. cooling well; 2. runner; 21. buffer zone; 22. ejector rod; 3. mold cavity; 4. gate; 5. Terms such as spoiler column, but the possibility of using other terms is not excluded. These terms are used only for the purpose of describing and explaining the essence of the present invention more conveniently; interpreting them as any kind of additional limitation is against the spirit of the present invention.

Claims (7)

1. a kind of injection mold of built-in mixed flow, including die ontology (1), the die ontology (1) is interior to be provided with for product The die cavity (3) of shaping and the runner (2) for accepting extraneous plastic melt, use is provided between the runner (2) and die cavity (3) In the cast gate (4) of connection, the cast gate (4) is interior to be provided with turbulence columns (5), it is characterised in that the turbulence columns (5) are located at cast gate (4) cast gate (4) inner space is divided into two by-paths flowed through for plastic melt by the middle part of width, the turbulence columns (5) (42), the discharging opening of two by-paths (42) is relative draws close inclination, and the discharging opening of two by-paths (42) is in cast gate (4) and die cavity (3) connectivity part is converged.

2. the injection mold of built-in mixed flow according to claim 1, it is characterised in that turbulence columns (5) quantity is one Root, the turbulence columns (5) are prism-shaped, the seamed edge face cast gate (4) of the turbulence columns (5) and the connectivity part of runner (2).

3. the injection mold of built-in mixed flow according to claim 1, it is characterised in that cast gate (4) two sides are The concave face (41) being adapted with turbulence columns (5) lateral surface, concave face (41) are collectively forming two arcs with turbulence columns (5) side wall By-path (42).

4. the injection mold of built-in mixed flow according to claim 1, it is characterised in that two by-path (42) structures are in The heart is symmetrical set.

5. the injection mold of the built-in mixed flow according to Claims 1-4 any one, it is characterised in that the cast gate (4) The cooling well (11) for accommodating plastic melt forward's cold burden is provided with the connectivity part of runner (2).

6. the injection mold of the built-in mixed flow according to Claims 1-4 any one, it is characterised in that each die cavity (3) On be connected with multiple cast gates (4), the end for being used to connect with cast gate (4) on runner (2) is provided with the buffering area for shunting (21), cast gate (4) connects with buffering area (21).

7. the injection mold of built-in mixed flow according to claim 6, it is characterised in that be provided with the buffering area (21) For the knock-pin (22) of plastics ejection will to be condensed in runner (2).