PEEK pipe extrusion die

Abstract

The utility model belongs to the technical field of extrusion dies, and particularly relates to a PEEK pipe extrusion die which comprises an outer mouth die, an outer sizing device, an inner sizing device and an inner core rod, the inner sizing device and the inner core rod are sequentially connected, and the outer mouth die and the outer sizing device are sequentially connected. A first extrusion channel is formed between the outer opening die and the inner diameter die; a detachable temperature measuring module is arranged on the outer wall of the outer opening mold; the outer sizing sleeve is arranged on the periphery of the inner core rod, and a second extrusion channel is formed between the outer sizing sleeve and the inner core rod; a temperature control ring groove is formed in the outer sizing device, the outer sizing device is sleeved with a sheath used for covering the temperature control ring groove, and heat preservation oil is introduced into the temperature control ring groove; the first extrusion channel and the second extrusion channel are communicated in sequence; the inner diameter comprises a first flow guide part, a transition part and a second flow guide part which are sequentially connected towards the inner core rod, the outer diameter of the first flow guide part is larger than that of the second flow guide part, and the outer diameter of the transition part is gradually reduced from the first flow guide part to the second flow guide part; and the outer diameter of the inner core rod is consistent with that of the second flow guide part.

Description

Technical Field

[0001] The utility model belongs to the technical field of extrusion dies, in particular to a PEEK pipe extrusion die. Background Art

[0002] PEEK (polyetheretherketone) is a high-performance engineering plastic with excellent strength and heat resistance. It can be used as a substitute for metal in high-temperature applications. Due to its unique properties, PEEK pipes are widely used in chemical, aerospace, medical equipment and other fields.

[0003] There are some problems in the production process of existing PEEK pipe extrusion dies: 1. Complex mold structure: The structural design of existing PEEK pipe extrusion dies is complex, which not only increases the manufacturing cost and processing difficulty, but also easily affects the service life and maintenance cost of the mold; 2. Unreasonable selection of mold materials: The existing extrusion dies are not reasonable in material selection, resulting in poor wear resistance, corrosion resistance and thermal conductivity of the mold, affecting the quality and production efficiency of the extruded products; 3. Failure to consider material fluidity: The design of some extrusion dies does not fully consider the fluidity of PEEK materials, resulting in dead corners and bubbles easily appearing during the extrusion process, affecting the quality of the extruded products; 4. Failure to consider the characteristics of the extruded product: The design of the existing extrusion die does not fully consider the characteristics of the extruded product PEEK pipe, resulting in problems such as rough surface and inaccurate size of the extruded PEEK pipe product; 5. Improper design of the cooling system: The improper design of the cooling system of the existing extrusion die leads to uneven shrinkage of the extruded product, and even warping and deformation; 6. Poor adaptability: It is difficult to apply to PEEK pipes of various sizes. Utility Model Content

[0004] In order to solve the problems of the PEEK pipe extrusion die in the prior art, such as complex structure, high cost, poor extrusion quality and low extrusion efficiency, the utility model provides a PEEK pipe extrusion die.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: a PEEK pipe extrusion die, comprising an outer die, an outer sizing, an inner sizing and an inner core rod, the inner sizing and the inner core rod are connected in sequence, and the outer die and the outer sizing are connected in sequence; the outer die is sleeved on the outer periphery of the inner sizing, and a first extrusion channel is formed between the outer die and the inner sizing; a detachable temperature measuring module is arranged on the outer wall of the outer die; the outer sizing sleeve is arranged on the outer periphery of the inner core rod, and a second extrusion channel is formed between the outer sizing and the inner core rod; a temperature control ring groove is opened on the outer sizing, and a sheath is sleeved on the outer sizing, and the sheath is used to cover the temperature control ring groove, and the temperature control ring groove is passed through the insulation oil; the first extrusion channel and the second extrusion channel are connected in sequence;

[0006] The inner sizing portion includes a first guide portion, a transition portion, and a second guide portion which are connected in sequence toward the inner core rod. The outer diameter of the first guide portion is greater than the outer diameter of the second guide portion, and the outer diameter of the transition portion gradually decreases from the first guide portion to the second guide portion. The outer diameter of the inner core rod is consistent with the outer diameter of the second guide portion.

[0007] Preferably, an inner insulation gasket is provided between the inner sizing and the inner core rod, and an outer insulation gasket is provided between the outer die and the outer sizing, and the positions of the outer insulation gasket and the inner insulation gasket are relatively arranged. Since the temperature of the first extrusion channel is higher than that of the second extrusion channel, the arrangement of the inner insulation gasket and the outer insulation gasket greatly reduces the influence between the first extrusion channel and the second extrusion channel caused by the temperature difference, which is beneficial to the flow and extrusion molding of the PEEK material, and dead corners and bubbles are not likely to appear during the extrusion process, thereby improving the extrusion quality and extrusion efficiency; and it is beneficial for the temperature measurement module to detect the temperature of the first extrusion channel in real time. Through the real-time temperature reaction, the temperature of the first extrusion channel can be adjusted to avoid problems such as uneven melting and inconsistent crystallinity of the PEEK material during the melting process, thereby ensuring the high-quality extrusion of the extruded pipe.

[0008] Furthermore, the end of the outer die near the outer diameter is provided with an inner ring groove, and the inner diameter of the inner ring groove is consistent with the inner diameter of the outer diameter. The inner ring groove serves as a transition from the first extrusion channel to the second extrusion channel, reducing the risk of dead angles and bubbles during the extrusion process, and reducing the risk of rough surface and inaccurate size of the extruded PEEK pipe product.

[0009] Preferably, the inclination angle of the transition part is α, and the value range of α is 30°~60°. The inner surface of the outer die matches the shape of the outer surface of the inner sizing, and the inner sizing includes a first guide part, a transition part and a second guide part connected in sequence, and the angle of the transition part is selected appropriately to ensure that the PEEK material melt can flow smoothly and eliminate the weld mark, so as to obtain a high-quality inner surface of the PEEK pipe; in addition, the outer diameter of the transition part is gradually reduced from the first guide part to the second guide part, and the angle of the transition part is selected appropriately, which also facilitates the removal of the PEEK pipe after extrusion.

[0010] Preferably, the end of the outer die away from the outer sizing has a flange edge extending outward; the outer sleeve of the outer sizing is provided with a flange plate, and the flange plate is located between the sheath and the outer die, so as to facilitate the reliable installation and fixation of the PEEK pipe extrusion die.

[0011] Preferably, the outer die and the inner sizing are made of p20 steel, and the outer sizing and the inner core rod are made of H13 steel. The outer die and the inner sizing are made of the same material, and the outer sizing and the inner core rod are made of the same material, ensuring consistency in adapting to temperature changes. The material of the PEEK pipe extrusion die is a highly wear-resistant, corrosion-resistant, heat-resistant, and anti-sticking die steel material, ensuring the dimensional accuracy, stability, and service life of the PEEK pipe extrusion die, and the cost is low, improving the quality and production efficiency of the extruded product.

[0012] Beneficial effects:

[0013] 1. The PEEK pipe extrusion die of the utility model adopts a split structure, which has a simple structure, ingenious design, and is easy to disassemble, assemble and maintain. It can produce PEEK pipes of different specifications, has a wide range of applications, and greatly reduces costs;

[0014] 2. In the PEEK pipe extrusion die of the utility model, the outer diameter of the first guide part is larger than the outer diameter of the second guide part, and the outer diameter of the transition part gradually decreases from the first guide part to the second guide part, so as to ensure that the PEEK material melt can flow smoothly and eliminate the welding mark, thereby obtaining a high-quality inner surface of the PEEK pipe and facilitating the removal of the PEEK pipe after extrusion;

[0015] 3. In the PEEK pipe extrusion die of the utility model, the temperature measuring module detects the temperature of the first extrusion channel in real time. Through real-time temperature response, the temperature of the first extrusion channel can be adjusted to avoid problems such as uneven melting and inconsistent crystallinity of the PEEK material during the melting process, thereby ensuring high-quality extrusion of the extruded pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the PEEK pipe extrusion die of the utility model;

[0018] Figure 2 This is a three-dimensional structural schematic diagram of the PEEK pipe extrusion die of the utility model from another angle;

[0019] Figure 3 It is a cross-sectional schematic diagram of the PEEK pipe extrusion die of the utility model;

[0020] Figure 4It is a cross-sectional schematic diagram of the utility model when the PEEK pipe extrusion die is connected to the head of the extruder;

[0021] In the figure: 1, outer die, 1-1, inner ring groove, 1-2, flange edge, 2, outer sizing, 2-1, temperature control ring groove, 3, inner sizing, 3-1, first flow guide part, 3-2, transition part, 3-3, second flow guide part, 4, inner core rod, 5, first extrusion channel, 6, temperature measurement module, 7, second extrusion channel, 8, sheath, 9, inner insulation gasket, 10, outer insulation gasket, 11, flange, 12, machine head; α is the inclination angle of the transition part. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figures 1 to 3 As shown, a PEEK pipe extrusion die comprises an outer die 1, an outer sizing 2, an inner sizing 3 and an inner core rod 4, wherein the inner sizing 3 and the inner core rod 4 are connected in sequence, and the outer die 1 and the outer sizing 2 are connected in sequence; the outer die 1 is sleeved on the outer periphery of the inner sizing 3, and a first extrusion channel 5 is formed between the outer die 1 and the inner sizing 3; a detachable temperature measuring module 6 is arranged on the outer wall of the outer die 1; the outer sizing 2 is sleeved on the outer periphery of the inner core rod 4, and a second extrusion channel 7 is formed between the outer sizing 2 and the inner core rod 4; a temperature control ring groove 2-1 is provided on the outer sizing 2, and the outer sizing A sheath 8 is provided on the diameter 2, and the sheath 8 is used to cover the temperature control ring groove 2-1, and the temperature control ring groove 2-1 passes through the insulation oil; the first extrusion channel 5 and the second extrusion channel 7 are connected in sequence; the inner sizing 3 includes a first guide part 3-1, a transition part 3-2 and a second guide part 3-3 which are connected in sequence toward the inner core rod 4, the outer diameter of the first guide part 3-1 is larger than the outer diameter of the second guide part 3-3, and the outer diameter of the transition part 3-2 gradually decreases from the first guide part 3-1 to the second guide part 3-3; the outer diameter of the inner core rod 4 is consistent with the outer diameter of the second guide part 3-3.

[0024] Specifically, in this embodiment, Figure 3As shown, an inner heat-insulating gasket 9 is arranged between the inner sizing 3 and the inner core rod 4, and an outer heat-insulating gasket 10 is arranged between the outer die 1 and the outer sizing 2, and the outer heat-insulating gasket 10 and the inner heat-insulating gasket 9 are arranged relatively. Since the temperature of the first extrusion channel 5 is higher than the temperature of the second extrusion channel 7, the arrangement of the inner heat-insulating gasket 9 and the outer heat-insulating gasket 10 greatly reduces the influence between the first extrusion channel 5 and the second extrusion channel 7 caused by the temperature difference, which is beneficial to the flow and extrusion molding of the PEEK material, and dead corners and bubbles are not easy to appear during the extrusion process, thereby improving the extrusion quality and extrusion efficiency; and it is beneficial for the temperature measuring module 6 to detect the temperature of the first extrusion channel 5 in real time. Through the real-time temperature reaction, the temperature of the first extrusion channel 5 can be adjusted to avoid the problems of uneven melting and inconsistent crystallinity of the PEEK material during the melting process, thereby ensuring the high-quality extrusion of the extruded pipe.

[0025] Specifically, in this embodiment, Figure 3 As shown, the end of the outer die 1 close to the outer sizing 2 has an inner annular groove 1-1, and the inner diameter of the inner annular groove 1-1 is consistent with the inner diameter of the outer sizing 2. The inner annular groove 1-1 plays a transition role from the first extrusion channel 5 to the second extrusion channel 7, reducing the risk of dead corners and bubbles during the extrusion process, and reducing the risk of rough surface and inaccurate size of the extruded PEEK pipe product.

[0026] Specifically, in this embodiment, Figure 3 As shown, the inclination angle of the transition part 3-2 is α, and the value range of α is 30°~60°. The inner surface of the outer die 1 matches the shape of the outer surface of the inner sizing 3, and the inner sizing 3 includes a first guide part 3-1, a transition part 3-2 and a second guide part 3-3 connected in sequence, and the angle of the transition part 3-2 is selected appropriately to ensure that the PEEK material melt can flow smoothly and eliminate the welding mark, so as to obtain a high-quality inner surface of the PEEK pipe; in addition, the outer diameter of the transition part 3-2 is gradually reduced from the first guide part 3-1 to the second guide part 3-3, and the angle of the transition part 3-2 is selected appropriately, which also facilitates the removal of the PEEK pipe after extrusion.

[0027] Specifically, in this embodiment, the outer die 1 and the inner sizing 3 are made of p20 steel, the outer sizing 2 and the inner core rod 4 are made of H13 steel, the sheath 8 and the flange 11 are made of 45 steel, and the inner insulation gasket 9 and the outer insulation gasket 10 are made of mica. The outer die 1 and the inner sizing 3 of this embodiment are made of the same material, and the outer sizing 2 and the inner core rod 4 are made of the same material to ensure consistency in adapting to temperature changes. The material of the PEEK pipe extrusion die is a highly wear-resistant, corrosion-resistant, heat-resistant, and anti-sticking die steel material to ensure the dimensional accuracy, stability, and service life of the PEEK pipe extrusion die, and the cost is low, which improves the quality and production efficiency of the extruded product. The material of the PEEK pipe extrusion die is not limited to the above materials, and tungsten steel, ceramic materials, etc. can also be used.

[0028] Specifically, in this embodiment, the outer die 1 has a flange edge 1-2 extending outwardly from one end away from the outer sizing 2; the outer sleeve of the outer sizing 2 is provided with a flange 11, and the flange 11 is located between the sheath 8 and the outer die 1, so as to facilitate the reliable installation and fixation of the PEEK pipe extrusion die; in this embodiment, Figure 3 and Figure 4 As shown, the inner diameter 3 and the inner core rod 4 are coaxially penetrated with mounting holes, and are connected to the head 12 of the extruder through the mounting holes.

[0029] Here’s how it works:

[0030] First, the extruder head 12 extrudes the PEEK material melt toward the first extrusion channel 5, and then extrudes from the first extrusion channel 5 to the second channel in sequence. Figure 4As shown, the arrow direction indicates the conveying direction of the PEEK material melt and the PEEK tube after molding; wherein, the first guide portion 3-1, the transition portion 3-2 and the second guide portion 3-3, as well as the angle of the transition portion 3-2 are appropriately selected to ensure that the PEEK material melt can flow smoothly and eliminate the welding mark, thereby obtaining a high-quality inner surface of the PEEK tube and facilitating the removal of the PEEK tube after extrusion; wherein, the inner annular groove 1-1 plays a transition role from the first extrusion channel 5 to the second extrusion channel 7, reducing the risk of dead corners and bubbles during the extrusion process, and reducing the risk of rough surface and inaccurate size of the extruded PEEK tube product. Among them, because the temperature of the first extrusion channel 5 is higher than that of the second extrusion channel 7, the setting of the inner insulation gasket 9 and the outer insulation gasket 10 greatly reduces the influence between the first extrusion channel 5 and the second extrusion channel 7 caused by the temperature difference, which is beneficial to the flow and extrusion molding of the PEEK material. Dead corners and bubbles are not easy to appear during the extrusion process, thereby improving the extrusion quality and extrusion efficiency; and it is beneficial for the temperature measuring module 6 to detect the temperature of the first extrusion channel 5 in real time. Through real-time temperature reaction, the temperature of the first extrusion channel 5 can be adjusted to avoid problems such as uneven melting and inconsistent crystallinity of the PEEK material during the melting process, thereby ensuring high-quality extrusion of the extruded pipe.

[0031] When producing PEEK pipes of different specifications, if the inner diameter of the PEEK pipe is different, replace the inner sizing 3 and the inner core rod 4; if the outer diameter of the PEEK pipe is different, replace the outer die 1 and the outer sizing 2, wherein the temperature measuring module 6 is disassembled and assembled to the replaced outer die 1, and the sheath 8 is disassembled and assembled to the replaced outer sizing 2; if both the inner diameter and the outer diameter of the PEEK pipe are different, replace the inner sizing 3, the inner core rod 4, the outer die 1 and the outer sizing 2. That is, the PEEK pipe extrusion die adopts a split structure, which has a simple structure, a clever design, is easy to disassemble, assemble and maintain, can produce PEEK pipes of different specifications, has a wide range of applications, and greatly reduces costs.

[0032] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A PEEK pipe extrusion die, characterized in that: The invention comprises an outer die (1), an outer sizing plate (2), an inner sizing plate (3) and an inner core rod (4), wherein the inner sizing plate (3) and the inner core rod (4) are connected in sequence, and the outer die (1) and the outer sizing plate (2) are connected in sequence; the outer die (1) is sleeved on the outer periphery of the inner sizing plate (3), and a first extrusion channel (5) is formed between the outer die (1) and the inner sizing plate (3); a detachable temperature measuring module (6) is arranged on the outer wall of the outer die (1); The sizing device (2) is sleeved on the outer circumference of the inner core rod (4), and a second extrusion channel (7) is formed between the outer sizing device (2) and the inner core rod (4); a temperature control ring groove (2-1) is provided on the outer sizing device (2), and a sheath (8) is sleeved on the outer sizing device (2), and the sheath (8) is used to cover the temperature control ring groove (2-1), and the temperature control ring groove (2-1) is filled with heat insulation oil; the first extrusion channel (5) and the second extrusion channel (7) are connected in sequence; The inner sizing portion (3) comprises a first guide portion (3-1), a transition portion (3-2) and a second guide portion (3-3) which are connected in sequence in a direction toward the inner core rod (4); the outer diameter of the first guide portion (3-1) is greater than the outer diameter of the second guide portion (3-3); the outer diameter of the transition portion (3-2) gradually decreases from the first guide portion (3-1) to the second guide portion (3-3); and the outer diameter of the inner core rod (4) is consistent with the outer diameter of the second guide portion (3-3).

2. The PEEK pipe extrusion die according to claim 1, characterized in that: An inner heat-insulating gasket (9) is arranged between the inner sizing plate (3) and the inner core rod (4), and an outer heat-insulating gasket (10) is arranged between the outer die (1) and the outer sizing plate (2). The outer heat-insulating gasket (10) and the inner heat-insulating gasket (9) are arranged in relative positions.

3. The PEEK pipe extrusion die according to claim 2, characterized in that: The end of the outer die (1) close to the outer diameter (2) is provided with an inner annular groove (1-1), and the inner diameter of the inner annular groove (1-1) is consistent with the inner diameter of the outer diameter (2).

4. The PEEK pipe extrusion die according to claim 1, characterized in that: The inclination angle of the transition portion (3-2) is α, and the value range of α is 30° to 60°.

5. The PEEK pipe extrusion die according to claim 1, characterized in that: The outer die (1) has a flange edge (1-2) extending outwardly from one end away from the outer sizing device (2); the outer sleeve of the outer sizing device (2) is provided with a flange plate (11), and the flange plate (11) is located between the sheath (8) and the outer die (1).

6. The PEEK pipe extrusion die according to any one of claims 1 to 5, characterized in that: The outer die (1) and the inner sizing die (3) are both made of P20 steel, and the outer sizing die (2) and the inner core rod (4) are both made of H13 steel.

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