Extrusion die with high cooling efficiency

Abstract

The utility model discloses an extrusion die with high cooling efficiency, which comprises an inner die plate, a front die head and a middle outer die plate bolted and fixed on the outer wall of one side of the front die head, and a rear die head is bolted on the outer wall of one side, far away from the front die head, of the middle outer die plate. An inner mold core abutting against the outer wall of one side of the middle-section outer mold plate is installed at the center position in the front mold head, a conical valve seat is fixed to the end, close to the rear mold head, of the inner mold core, and a material cavity allowing molten materials to enter is formed between the conical valve seat and the rear mold head. The interior of the forming cavity is isolated by the water-cooling isolation type cooling structure, and a workpiece is preliminarily cooled and formed before being further guided, so that the shape stability and the size precision of the workpiece are facilitated, deformation and deviation caused by high temperature in the guiding process are reduced, and the service life of the workpiece is prolonged. And preliminary cooling in the forming cavity enables the workpiece to reach a curing state more quickly, so that follow-up treatment can be performed more quickly.

Description

Technical Field

[0001] The utility model relates to the technical field of extrusion dies, in particular to an extrusion die with high cooling efficiency. Background Art

[0002] Extrusion molding dies are important tools in the processing of plastics, rubber and other materials. The raw materials are plasticized by heating them, and then extruded into the mold through an extruder head to form the desired cross-sectional shape. The final product is collected after cooling and solidification. Its structure includes a feeding device, a heating device, an extruder head, a mold cavity and a cooling device. The working principle is based on the plasticity of thermoplastic materials, which are cooled and solidified after extrusion under high temperature and high pressure; such as an extrusion mold disclosed in the authorization announcement number CN210161578U, including a die sleeve, a connecting sleeve and a diverter plate fixedly connected in sequence, the middle part of the diverter plate is fixedly connected with a core rod extending outward, and the die sleeve and the connecting sleeve are both sleeved on the periphery of the core rod, characterized in that the joint surface between the die sleeve and the connecting sleeve is in the shape of an arc surface. By setting the joint surface between the die sleeve and the connecting sleeve in the shape of an arc surface, the sealing area can be further increased and the probability of injection fluid overflow can be reduced. In addition, the die sleeve The connecting sleeve can produce a positioning effect through the joint surface before fixed assembly to ensure accurate positioning, and can form a limiting effect in the radial direction to reduce movement, so as to improve the assembly accuracy and avoid eccentricity and other phenomena. However, during the use of this technical solution, the outlet temperature of the die sleeve is relatively high, and the formed workpiece needs to be introduced into the coolant in time to form it. During the introduction of the workpiece into the coolant, the formed workpiece in a high-temperature state is prone to deformation due to guide deviation, that is, improper guidance or uneven guiding force will cause the workpiece to deviate in the coolant, resulting in irregular shape or even serious deformation of the workpiece. Utility Model Content

[0003] The purpose of the utility model is to provide an extrusion die with high cooling efficiency, wherein an outer cylindrical die sleeve and an inner die tube with a certain length are installed at the tail end of a conical valve seat, and a tubular workpiece formed at high temperature is formed in a forming cavity between the outer cylindrical die sleeve and the inner die tube, and a water-cooled isolation cooling structure is used to initially cool and form the workpiece in the forming cavity, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an extrusion mold with high cooling efficiency, comprising an inner mold plate, a front mold head and a middle-section outer mold plate bolted and fixed on an outer wall of one side of the front mold head, a rear mold head being bolted on an outer wall of the middle-section outer mold plate on a side away from the front mold head, an inner mold core abutting against an outer wall of one side of the middle-section outer mold plate is installed at a central position inside the front mold head, a conical valve seat is fixed on one end of the inner mold core close to the rear mold head, a material cavity for molten material to enter is formed between the conical valve seat and the rear mold head, a feed hollow portion isolated from the inner wall of the front mold head is provided on the outer wall of the inner mold core on a side away from the rear mold head, an outer cylindrical mold sleeve is installed on one end of the conical valve seat away from the inner mold core, an inner mold tube is fixed on an outer wall of one side of the rear mold head, a molding cavity is provided between the inner mold tube and the outer cylindrical mold sleeve, and a water-cooled isolation type cooling structure is installed on the outer peripheral surface of the outer cylindrical mold sleeve.

[0005] Preferably, an outer flange 1 is integrally formed at one end of the front die head surface, and four main positioning bolts for bolting the middle section outer template are installed inside the outer flange 1 at equal intervals.

[0006] Preferably, four equally spaced auxiliary positioning bolts are installed on the outer wall of one side of the rear die head, an outer flange plate 2 is integrally formed at one end of the conical valve seat surface, and the threaded end of the auxiliary positioning bolt extends to the interior of the outer flange plate 2.

[0007] Preferably, concentric internal threaded column cavities are provided on the central axis of the inner mold core, the middle outer mold plate and the conical valve seat, and long bolts are installed inside the internal threaded column cavities, which are used to connect the inner mold core, the middle outer mold plate and the conical valve seat.

[0008] Preferably, an arc-shaped arched portion is provided on the outer wall of the inner template.

[0009] Preferably, the water-cooled isolation cooling structure includes an external cooling tube mounted on an outer cylindrical mold sleeve and an annular liner integrally formed on the inner wall of the external cooling tube, a gap portion is provided between the inner wall of the annular liner and the outer wall of the outer cylindrical mold sleeve, and a liquid storage cavity is provided between the outer wall of the annular liner and the inner wall of the external cooling tube.

[0010] Preferably, liquid inlet pipes are installed on both sides of the top end of the external cooling tube, and a liquid outlet pipe is installed on one side of the bottom end of the external cooling tube.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the extrusion mold with high cooling efficiency is provided with structures that cooperate with each other, such as an inner mold tube and a water-cooled isolation cooling structure, so that the molten material is squeezed into the molding cavity and forms an annular tube material. Since the interior of the molding cavity is isolated by the water-cooled isolation cooling structure, the workpiece has completed preliminary cooling and molding before further guiding, which is helpful for the shape stability and dimensional accuracy of the workpiece, and reduces deformation and displacement caused by high temperature during the guiding process. The preliminary cooling in the molding cavity enables the workpiece to reach a solidified state faster, so that subsequent processing can be carried out faster, which is convenient for the staff to guide the workpiece from the outer cylindrical mold sleeve and the tail end of the inner mold tube and carry out subsequent cooling work. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The three-dimensional structure of the utility model is shown in FIG. Figure 1 ;

[0013] Figure 2 It is a three-dimensional cross-sectional structural schematic diagram of the utility model;

[0014] Figure 3 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0015] Figure 4 This is a schematic diagram of the three-dimensional structure of the front die head of the utility model;

[0016] Figure 5 The three-dimensional structure of the utility model is shown in FIG. Figure 2 ;

[0017] In the figure: 1. front die head; 101. outer flange one; 102. main positioning bolt; 2. middle outer template; 3. rear die head; 301. auxiliary positioning bolt; 4. inner mold core; 401. feed hollow part; 5. inner template; 6. conical valve seat; 601. outer flange two; 7. material cavity; 8. outer cylindrical mold sleeve; 9. inner mold tube; 901. molding cavity; 10. water-cooled isolation cooling structure; 1001. outer cooling pipe; 1002. annular liner; 1003. liquid storage cavity; 1004. liquid inlet pipe; 1005. liquid outlet pipe. DETAILED DESCRIPTION

[0018] 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. 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.

[0019] See also Figure 1-5The utility model provides an embodiment: an extrusion die with high cooling efficiency, comprising an inner mold plate 5, a front mold head 1 and a middle outer mold plate 2 bolted and fixed on the outer wall of one side of the front mold head 1, a rear mold head 3 is bolted on the outer wall of the middle outer mold plate 2 on the side away from the front mold head 1, an inner mold core 4 is installed at the central position inside the front mold head 1 and abuts against the outer wall of one side of the middle outer mold plate 2, a conical valve seat 6 is fixed on one end of the inner mold core 4 close to the rear mold head 3, a material cavity 7 for molten material to enter is formed between the conical valve seat 6 and the rear mold head 3, a feed hollow portion 401 isolated from the inner wall of the front mold head 1 is provided on the outer wall of the inner mold core 4 on the side away from the rear mold head 3, an outer cylindrical mold sleeve 8 is installed on the end of the conical valve seat 6 away from the inner mold core 4, and an inner mold tube 9 is fixed on the outer wall of one side of the rear mold head 3;

[0020] A molding cavity 901 is provided between the inner mold tube 9 and the outer cylindrical mold sleeve 8, and a water-cooled isolation cooling structure 10 is installed on the outer peripheral surface of the outer cylindrical mold sleeve 8. The structural design of the outer cylindrical mold sleeve 8 and the inner mold tube 9 forms an independent molding cavity 901, which isolates the high-temperature molding workpiece from the external environment, and the water-cooled isolation cooling structure 10 rapidly reduces the temperature in the molding cavity 901 by water cooling, which is conducive to the rapid solidification and molding of the workpiece;

[0021] An outer flange 101 is integrally formed at one end of the surface of the front die head 1, and four main positioning bolts 102 for bolting the middle section outer template 2 are installed inside the outer flange 101 at equal intervals;

[0022] Four equally spaced auxiliary positioning bolts 301 are installed on the outer wall of one side of the rear die head 3, and an outer flange 2 601 is integrally formed at one end of the surface of the conical valve seat 6. The threaded end of the auxiliary positioning bolt 301 extends to the inside of the outer flange 2 601. The front die head 1 and the middle section outer template 2 are bolted together by the outer flange 101 and the main positioning bolt 102, and the rear die head 3, the conical valve seat 6, and the middle section outer template 2 are bolted together by the auxiliary positioning bolt 301 and the outer flange 2 601, thereby forming a stable mold structure with a material cavity 7;

[0023] A concentric internal threaded column cavity is provided on the central axis of the inner mold core 4, the middle outer mold plate 2, and the conical valve seat 6. A long bolt is installed inside the internal threaded column cavity. The long bolt is used to connect the inner mold core 4, the middle outer mold plate 2, and the conical valve seat 6. The internal threaded column cavity on the central axis of the inner mold core 4, the middle outer mold plate 2, and the conical valve seat 6 is penetrated and connected by the long bolt to ensure the concentricity between the workpieces.

[0024] The outer wall of the inner template 5 is provided with an arcuate arch portion, which can make the contact between the inner template and the molding material more uniform, avoiding local extrusion or stretching during the molding process;

[0025] The water-cooled isolation cooling structure 10 comprises an outer cooling tube 1001 sleeved on the outer cylindrical mold sleeve 8 and an annular inner liner 1002 integrally formed on the inner wall of the outer cooling tube 1001, a gap is provided between the inner wall of the annular inner liner 1002 and the outer wall of the outer cylindrical mold sleeve 8, and a liquid storage cavity 1003 is provided between the outer wall of the annular inner liner 1002 and the inner wall of the outer cooling tube 1001;

[0026] Liquid inlet pipes 1004 are installed on both sides of the top of the external cooling pipe 1001, and a liquid outlet pipe 1005 is installed on one side of the bottom of the external cooling pipe 1001. The liquid inlet pipe 1004 is connected to the external water supply end, and cold water enters the liquid storage cavity 1003 through the liquid inlet pipe 1004. By exchanging heat with the annular liner 1002 and the outer cylindrical mold sleeve 8, the stability of the workpiece in the molding cavity 901 is reduced. Rapid solidification and preliminary molding are used to improve the shape stability and dimensional accuracy of the workpiece. In this process, the cold water after heat exchange is discharged through the liquid outlet pipe 1005;

[0027] The ends of the liquid inlet pipe 1004 and the liquid outlet pipe 1005 can be connected to a switch valve to control the flow of the coolant.

[0028] When the embodiment of the present application is used, the staff first installs the extrusion die to the discharge port of the extruder, and connects the water-cooled isolation cooling structure 10 to the supply end and the recovery end of the external cold water, so that the interior of the water-cooled isolation cooling structure 10 is continuously supplied with cooling to achieve the purpose of cooling, and then heat is exchanged with the outer cylindrical mold sleeve 8 and the inner mold tube 9. At this time, the molten material of the extruder enters the material cavity 7 through the feed hollow portion 401 between the inner mold core 4 and the front die head 1, and follows the guidance of the inner mold core 4, the inner mold plate 5, and the conical valve seat 6 to enter the molding cavity 901 between the outer cylindrical mold sleeve 8 and the inner mold tube 9, that is, the molten material flows out from the inner mold core 4 to the inner mold tube 9. The workpiece flows in the same direction until it enters the molding cavity 901. During this process, the molten material is squeezed into the molding cavity 901 and forms an annular tube. Since the interior of the molding cavity 901 is isolated by the water-cooled isolation cooling structure 10, the workpiece has completed preliminary cooling and molding before further guiding, which is helpful for the shape stability and dimensional accuracy of the workpiece and reduces deformation and offset caused by high temperature during the guiding process. The preliminary cooling in the molding cavity 901 enables the workpiece to reach a solidified state faster, so that subsequent processing can be carried out faster, which is convenient for the staff to guide the workpiece from the tail end of the outer cylindrical mold sleeve 8 and the inner mold tube 9 and carry out subsequent cooling work, so as to better ensure product quality.

Claims

1. An extrusion die with high cooling efficiency, characterized in that: The invention comprises an inner mold plate (5), a front mold head (1), and a middle outer mold plate (2) bolted and fixed on the outer wall of one side of the front mold head (1); a rear mold head (3) is bolted on the outer wall of the middle outer mold plate (2) on the side away from the front mold head (1); an inner mold core (4) is installed at the center position inside the front mold head (1) and is in contact with the outer wall of one side of the middle outer mold plate (2); a conical valve seat (6) is fixed on the end of the inner mold core (4) close to the rear mold head (3); and a valve seat for molten material is formed between the conical valve seat (6) and the rear mold head (3). The material cavity (7) entering the cavity is provided with a feeding hollow portion (401) which is isolated from the inner wall of the front die head (1) on the outer wall of the inner die core (4) away from the rear die head (3); an outer cylindrical die sleeve (8) is installed on the end of the conical valve seat (6) away from the inner die core (4); an inner die tube (9) is fixed on the outer wall of one side of the rear die head (3); a molding cavity (901) is provided between the inner die tube (9) and the outer cylindrical die sleeve (8); and a water-cooled isolation cooling structure (10) is installed on the outer peripheral surface of the outer cylindrical die sleeve (8).

2. An extrusion die with high cooling efficiency according to claim 1, characterized in that: An outer flange (101) is integrally formed at one end of the surface of the front die head (1), and four main positioning bolts (102) for bolting the middle section outer template (2) are installed inside the outer flange (101) at equal intervals.

3. An extrusion die with high cooling efficiency according to claim 1, characterized in that: Four auxiliary positioning bolts (301) are installed at equal intervals on the outer wall of one side of the rear die head (3), and one end of the surface of the conical valve seat (6) is integrally formed with an outer flange plate 2 (601), and the threaded end of the auxiliary positioning bolt (301) extends to the interior of the outer flange plate 2 (601).

4. The extrusion die with high cooling efficiency according to claim 1, characterized in that: A concentric internal threaded column cavity is arranged on the central axis of the inner mold core (4), the middle outer mold plate (2) and the conical valve seat (6), and a long bolt is installed inside the internal threaded column cavity. The long bolt is used to connect the inner mold core (4), the middle outer mold plate (2) and the conical valve seat (6).

5. The extrusion die with high cooling efficiency according to claim 1, characterized in that: The outer wall of the inner template (5) is provided with a curved arched portion.

6. The extrusion die with high cooling efficiency according to claim 1, characterized in that: The water-cooled isolation cooling structure (10) comprises an external cooling tube (1001) sleeved on an external cylindrical mold sleeve (8) and an annular inner liner (1002) integrally formed on the inner wall of the external cooling tube (1001), a gap portion is provided between the inner wall of the annular inner liner (1002) and the outer wall of the external cylindrical mold sleeve (8), and a liquid storage cavity (1003) is provided between the outer wall of the annular inner liner (1002) and the inner wall of the external cooling tube (1001).

7. An extrusion die with high cooling efficiency according to claim 6, characterized in that: Liquid inlet pipes (1004) are installed on both sides of the top end of the external cooling pipe (1001), and a liquid outlet pipe (1005) is installed on one side of the bottom end of the external cooling pipe (1001).

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