Extrusion forming die

Abstract

The utility model discloses an extrusion forming die which comprises an inner die body and an outer die body, the inner die body is inserted into the outer die body, a runner is formed between the outer wall of the inner die body and the inner wall of the outer die body, and the runner comprises a discharging channel; the inner die body comprises a core rod, the outer die body comprises a mouth die, the core rod is inserted into the mouth die, a discharging channel is formed between the outer wall of the core rod and the inner wall of the mouth die, the core rod is provided with a first air outlet channel, the first air outlet channel is communicated with the discharging channel and arranged in the circumferential direction of the outer wall of the core rod, and the outer die body is provided with a second air outlet channel which is communicated with the discharging channel. The second air outlet duct is arranged in the circumferential direction of the inner wall of the outer mold body. The utility model provides an extrusion molding die which can improve the flowability of a material body.

Description

Technical Field

[0001] This utility model relates to the field of extrusion molding die technology, and more specifically, to an extrusion molding die. Background Technology

[0002] PE (polyethylene) materials refer to the sagging deformation phenomenon that occurs in polymer materials under high-temperature conditions under their own weight or external loads. For PE, the sagging characteristic mainly manifests during processing, such as extrusion molding, where the pipe is prone to sagging deformation due to softening at high temperatures, affecting the dimensional accuracy and appearance quality of the pipe. Currently, most pipe manufacturers try to combat sagging by adjusting the process temperature, specifically by lowering the process temperature and the machine speed to reduce shear heat. This results in poor melt flowability, leading to poor plasticization of the product, poor pipe performance, and low extrusion efficiency. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an extrusion molding die that improves the fluidity of the material.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an extrusion molding die, comprising an inner die body and an outer die body, wherein the inner die body is inserted into the outer die body, and a flow channel is formed between the outer wall of the inner die body and the inner wall of the outer die body, the flow channel including a discharge channel; the inner die body includes a mandrel, and the outer die body includes a die, wherein the mandrel is inserted into the die, and a discharge channel is formed between the outer wall of the mandrel and the inner wall of the die, the mandrel is provided with an air outlet channel one, which is connected to the discharge channel and is arranged circumferentially along the outer wall of the mandrel, and the outer die body is provided with an air outlet channel two, which is connected to the discharge channel and is arranged circumferentially along the inner wall of the outer die body.

[0005] The present invention is further configured such that, along the direction perpendicular to the axial direction of the mandrel, the first air outlet duct and the second air outlet duct are staggered.

[0006] The present invention is further configured such that the mandrel is provided with an air inlet duct 1, which is connected to an air outlet duct 1, and the air inlet duct 1 is connected to an air source through a pipe; the die is provided with an air inlet duct 2, which is connected to an air outlet duct 2, and the air inlet duct 2 is connected to an air source through a pipe.

[0007] The present invention is further configured such that the flow channel is also provided with a feeding channel, the feeding channel can be used to pass material, the material flows in from the feeding channel and flows out from the discharging channel, the opening of the first air outlet channel connected to the discharging channel faces the direction of the material flowing out of the discharging channel, and the opening of the second air outlet channel connected to the discharging channel faces the direction of the material flowing out of the discharging channel.

[0008] The present invention is further configured such that the inner mold body is provided with a through hole, the through hole is connected to the air inlet duct, and a heat insulation component is installed on the wall of the through hole.

[0009] The present invention is further configured such that the mandrel is provided with an air chamber 1, which connects the air inlet channel 1 and the air outlet channel 1 to each other, and the die is provided with an air chamber 2, which connects the air inlet channel 2 and the air outlet channel 2 to each other.

[0010] The present invention is further configured such that the inner mold body also includes a mold body 1, the mold body 1 is inserted into a core rod, and an air chamber 1 and an air outlet duct 1 are formed between the core rod and the mold body 1.

[0011] The present invention is further configured such that the outer mold body also includes a second mold body, the second mold body is inserted into the orifice mold, and an air chamber and an air outlet duct are formed between the orifice mold and the second mold body.

[0012] The present invention is further configured such that the outer mold body is equipped with a feeding connector, which is connected to the flow channel.

[0013] In summary, this utility model has the following beneficial effects:

[0014] The gas exiting from air outlet duct one and air outlet duct two compresses the material, creating air gap one between the outer wall of the mandrel and the material, and air gap two between the die and the material. As a result, the material separates from the outer wall of the mandrel and the inner wall of the die, reducing the flow resistance of the material. This compensates for the poor material flowability caused by lowering the process temperature and the speed of the main machine to reduce shear heat, as well as the associated problems of poor product plasticization, poor pipe performance, and low extrusion efficiency caused by poor material flowability. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram of an embodiment;

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 The diagram shows the forming of air gap one and air gap two in the embodiment.

[0018] Figure reference numerals: Inner mold body 1, mandrel 11, air chamber 111, air inlet duct 112, air outlet duct 113, air gap 114, through hole 12, mold body 13, outer mold body 2, die 21, air chamber 211, air inlet duct 212, air outlet duct 213, air gap 214, mold body 22, flow channel 3, feeding channel 31, discharging channel 32, feeding connector 4, feeding port 41, heat insulation component 5, spraying component 6, molding material 7. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figures 1-3 As shown, this embodiment discloses an extrusion molding die, including an inner mold body 1 and an outer mold body 2. The inner mold body 1 is inserted into the outer mold body 2, and a flow channel 3 is formed between the outer wall of the inner mold body 1 and the inner wall of the outer mold body 2. Figure 1 As shown, the flow channel 3 has an annular cross-section and includes a feed channel 31 on the left. The outer mold body 2 is equipped with a feed connector 4, which has a feed port 41. The feed port 41 is connected to the feed channel 31. Molten plastic material is injected into the feed channel 31 through the feed port 41 for extrusion molding.

[0021] like Figure 1 As shown, the flow channel 3 also includes a discharge channel 32 located on the right side, and a feed channel 31 connected to the extruder. The material flows in from the feed channel 31 and flows out from the discharge channel 32.

[0022] like Figure 1 , Figure 2 As shown, the inner mold body 1 includes a mandrel 11 located at the right end, and the outer mold body 2 includes a die 21 located at the right end. The mandrel 11 is inserted into the die 21, and a discharge channel 32 is formed between the outer wall of the mandrel 11 and the inner wall of the die 21. The material is extruded from the discharge channel 32 to form the molding material 7.

[0023] like Figure 2As shown, the inner mold body 1 also includes a mold body 13 located to the left of the mandrel 11. The mold body 13 is inserted into the mandrel 11, forming an air chamber 111 and an air outlet duct 113 between the mandrel 11 and the mold body 13. Both the air chamber 111 and the air outlet duct 113 are annular. The air outlet duct 113 is connected to the discharge channel 32, and the air chamber 111 is located on the side of the air outlet duct 113 away from the discharge channel 32. The mandrel 11 is also provided with an air inlet duct 112, which is located on the side of the air chamber 111 away from the air chamber 111. The air inlet duct 112 is connected to an air source generated by a high-pressure gas compressor. The air source gas is high-temperature gas to prevent excessive heat loss from the material. The air inlet duct 112 is a channel arranged radially along the core rod 11. Since the air in the air inlet duct 112 only enters in one direction, if the air inlet duct 112 is directly connected to the air outlet duct 113, it will cause serious uneven air pressure in the circumferential direction of the air outlet duct 113. Therefore, an air chamber 111 is set between the air inlet duct 112 and the air outlet duct 113. The air chamber 111 serves to store air and buffer the air flowing from the air inlet duct 112 to the air outlet duct 113, thereby improving the uniformity of air pressure in the circumferential direction of the air outlet duct 113.

[0024] like Figure 2 As shown, the outer mold body 2 also includes a second mold body 22 located to the left of the orifice mold 21. The second mold body 22 is inserted into the orifice mold 21, forming an air chamber 211 and an air outlet duct 213 between the orifice mold 21 and the second mold body 22. Both the second air chamber 211 and the second air outlet duct 213 are annular. The second air outlet duct 213 is connected to the discharge channel 32, and the second air chamber 211 is located on the side of the second air outlet duct 213 away from the discharge channel 32. The orifice mold 21 also has an air inlet duct 212, which is located on the side of the second air chamber 211 away from the second air outlet duct 213. The air inlet duct 212 is connected to an air source generated by a high-pressure gas compressor. The effect of the second air chamber 211 is the same as that of the first air chamber 111.

[0025] Air outlet duct 113 is arranged circumferentially along the outer wall of mandrel 11, and air outlet duct 213 is arranged circumferentially along the inner wall of outer mold body 2. The opening of air outlet duct 113 at the connection with discharge channel 32 faces the direction of material flow out of discharge channel 32, and the opening of air outlet duct 213 at the connection with discharge channel 32 faces the direction of material flow out of discharge channel 32. Figure 3As shown, as the material flows in the discharge channel 32, the gas exiting from the first air outlet 113 and the second air outlet 213 compresses the material, causing an air gap 114 to be formed between the outer wall of the mandrel 11 and the material, and an air gap 214 to be formed between the die 21 and the material. Therefore, the material separates from the outer wall of the mandrel 11 and the inner wall of the die 21, reducing the resistance to material flow. This compensates for the poor material flowability caused by lowering the process temperature and the speed of the main machine to reduce shear heat, as well as the associated problems of poor product plasticization, poor pipe performance, and low extrusion efficiency caused by poor material flowability.

[0026] The airflow exits from the right end of the discharge channel 32, while simultaneously propelling the material within the discharge channel 32.

[0027] like Figure 2 As shown, along the direction perpendicular to the axial direction of the mandrel 11, the first air outlet 113 and the second air outlet 213 are staggered left and right to avoid excessive airflow resistance on the same cross section, which would cause intermittent discharge. At the same time, the airflow of the first air outlet 113 and the second air outlet 213 can impede the flow of the material in the front section in the initial stage, thereby reducing the generation of waste material in the front section.

[0028] The inner mold body 1 has a through hole 12, which axially penetrates the inner mold body 1 and is connected to the air inlet duct 112. A heat insulation component 5 is installed on the wall of the through hole 12. A cooling pipe is installed inside the through hole 12, which is connected to a spray component 6. The spray component 6 sprays cooling water onto the molding material 7 to rapidly cool it down, thus solving the problem that current methods only cool the outer wall of the molding material 7. This results in higher cooling efficiency and reduces the sagging phenomenon of the molding material 7 (sagging refers to the downward deformation of polymer materials under high temperature conditions due to their own weight or external loads. Sagging is mainly manifested in the fact that during processing, such as extrusion molding, the pipe is prone to sagging deformation due to high temperature softening, affecting the dimensional accuracy and appearance quality of the pipe). Simultaneously, a cold air fan introduces cold air into the through hole 12 to improve the cooling effect on the inner wall of the molding material 7. The heat insulation component 5 is heat insulation cotton, which serves as temperature insulation.

[0029] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An extrusion molding die, characterized in that, It includes an inner mold body (1) and an outer mold body (2), the inner mold body (1) is inserted into the outer mold body (2), and a flow channel (3) is formed between the outer wall of the inner mold body (1) and the inner wall of the outer mold body (2), the flow channel (3) including a discharge channel (32); The inner mold body (1) includes a core rod (11), and the outer mold body (2) includes a die (21). The core rod (11) is inserted into the die (21). The discharge channel (32) is formed between the outer wall of the core rod (11) and the inner wall of the die (21). The core rod (11) is provided with an air outlet duct one (113), which is connected to the discharge channel (32). The air outlet duct one (113) is arranged circumferentially along the outer wall of the core rod (11). The outer mold body (2) is provided with an air outlet duct two (213), which is connected to the discharge channel (32). The air outlet duct two (213) is arranged circumferentially along the inner wall of the outer mold body (2).

2. The extrusion molding die according to claim 1, characterized in that, Along a direction perpendicular to the axial direction of the core rod (11), the first air outlet duct (113) and the second air outlet duct (213) are staggered.

3. The extrusion molding die according to claim 1, characterized in that, The core rod (11) is provided with an air inlet duct (112), which is connected to the air outlet duct (113). The air inlet duct (112) is connected to the air source through a pipe. The die (21) is provided with an air inlet duct (212), which is connected to the air outlet duct (213). The air inlet duct (212) is connected to the air source through a pipe.

4. The extrusion molding die according to claim 1, characterized in that, The flow channel (3) is also provided with a feeding channel (31), in which material can be introduced. The material flows in from the feeding channel (31) and flows out from the discharge channel (32). The opening of the first air outlet channel (113) connected to the discharge channel (32) faces the direction in which the material flows out of the discharge channel (32). The opening of the second air outlet channel (213) connected to the discharge channel (32) faces the direction in which the material flows out of the discharge channel (32).

5. An extrusion molding die according to claim 3, characterized in that, The inner mold body (1) is provided with a through hole (12), which is connected to the air inlet duct (112), and a heat insulation component (5) is installed on the wall of the through hole (12).

6. An extrusion molding die according to claim 3, characterized in that, The core rod (11) is provided with an air chamber 1 (111), which connects the air inlet duct 1 (112) and the air outlet duct 1 (113). The die (21) is provided with an air chamber 2 (211), which connects the air inlet duct 2 (212) and the air outlet duct 2 (213).

7. An extrusion molding die according to claim 6, characterized in that, The inner mold body (1) also includes a mold body one (13), which is inserted into the core rod (11), and the core rod (11) and the mold body one (13) form the air chamber one (111) and the air outlet duct one (113); The outer mold body (2) also includes a second mold body (22), which is inserted into the mouth mold (21). The mouth mold (21) and the second mold body (22) form the second air chamber (211) and the second air outlet duct (213).

8. An extrusion molding die according to claim 1, characterized in that, The outer mold body (2) is equipped with a feed connector (4), which is connected to the flow channel (3).

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