Paste extrusion die

Abstract

A paste extrusion die comprises a cylinder barrel, a cylinder barrel nut, a sealing ring assembly and a lower die, the cylinder barrel is fixed to the lower die, an extrusion inner cavity of the lower die sequentially comprises a feeding section, a circular deformation section, a stress relaxation section, a film release expansion section, a flat deformation section and a discharging section, and the sealing ring assembly is arranged at the front end of the feeding section. Extrusion cavities in the left die and the right die of the lower die are symmetrically designed; the sealing ring assembly comprises a sealing ring supporting ring, an air bag, an inflation hole and a sealing ring. The air bag is in extrusion fit with the end face of the sealing ring through inflation. According to the extrusion die disclosed by the utility model, the runner between the cylindrical blank body feed port and the flat base band discharge port is integrally designed, and the extrusion inner cavity is designed, so that the flat base band is consistent in density and high in film strength, and the surface quality of the base band is optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to extrusion die technical field, concretely is a paste extrusion die. BACKGROUND

[0002] The traditional circular mould extrusion obtains the circular stick embryo and needs to form the zonal baseband through the calendering, can produce the problem such as the density of middle and two sides is not consistent, baseband width is not controllable, baseband cracking, film strength is poor etc. The patent CN201669866U has described the mould for polytetrafluoroethylene sheet extrusion, the extrusion inner chamber of this mould is set to flat, guarantee that the uniformity of paste extrusion product is higher, the inner chamber body of the flat mould involved in this patent is asymmetric design and the flat mould is only a part of extrusion change runner, still needs and another part's circular outlet mould cooperation use, like this will appear the step problem in the junction of circular mould and flat mould, influence the smoothness of extrusion baseband, even appear some obvious scratch marks.

[0003] The utility model provides a paste extrusion die, solves above-mentioned technical problem. UTILITY MODEL CONTENTS

[0004] A kind of paste extrusion die, including cylinder, cylinder nut, sealing ring assembly, lower mould, the cylinder is fixedly connected with the end of the lower mould by the cylinder nut, the lower mould includes left mould, right mould, the left mould, right mould structure is symmetrical, the inner wall surface of the left mould, right mould is combined into extrusion inner chamber, the sealing ring assembly is set at the intersection of the cylinder and lower mould.

[0005] Preferably, the extrusion inner chamber of the lower mould includes a feeding section, a circular deformation section, a stress relaxation section, a film separation expansion section, a flat deformation section and a discharging section in sequence from the feeding end to the discharging end.

[0006] Preferably, the inner wall of the sealing ring assembly is flush with the inner wall surface of the feeding section, and the sealing ring assembly is arranged at the front end of the feeding section.

[0007] Preferably, the sealing ring assembly of the paste extrusion die includes a sealing ring support ring, an air bag, an inflation hole and a sealing ring, the sealing ring support ring is arranged at the sealing ring mounting end face of the cylinder, the cylinder is processed with the inflation hole in communication with the air inlet of the air bag, the air bag is arranged in the support space of the sealing ring support ring, and the air inlet of the air bag is connected with the gas source through an air inlet pipeline.

[0008] Preferably, the sealing ring assembly further includes a detection branch pipe in communication with the air inlet pipeline, and the detection branch pipe is connected with a gas pressure sensor to detect the air pressure in the air bag in real time.

[0009] Preferably, the paste extrusion die, the feeding section is a cylinder structure with the same size as the cylinder feeding port, the circular deformation section is a conical structure, and the plane angle α of the circular deformation section is 35°-65°.

[0010] Preferably, the paste extrusion die, the stress relaxation section is a cylindrical structure, and the length-diameter ratio L / D of the stress relaxation section is 2-4.

[0011] Preferably, the paste extrusion die, the stress relaxation section is a cylindrical structure, and the length-diameter ratio L / D of the stress relaxation section is 2-4.

[0012] Preferably, the paste extrusion die, the stress relaxation section is a cylindrical structure, and the length-diameter ratio L / D of the stress relaxation section is 2-4.

[0013] Preferably, the paste extrusion die, the stress relaxation section is a cylindrical structure, and the length-diameter ratio L / D of the stress relaxation section is 2-4.

[0014] The paste extrusion die of the utility model relates to an integrated design of the flow channel between the initial cylindrical embryo feeding port and the flat base strip discharge port, which not only solves the problems of inconsistent base strip density and poor film strength of the circular die, but also avoids the technical problems of poor surface quality of the base strip made by the separated flat die, and the setting of the sealing ring assembly can ensure that the material can smoothly enter the lower die from the cylinder; the extrusion cavity of the extrusion die is designed in sections, and the accurate parameters ensure that the paste material can be extruded to obtain a high-performance base strip product. BRIEF DESCRIPTION OF DRAWINGS

[0015] The specific embodiments will be further described below in combination with the drawings, in which:

[0016] Figure 1 is a paste extrusion die structure schematic view related to the utility model;

[0017] Figure 2 is Figure 1 A-A sectional view in

[0018] Figure 3 is Figure 2 Structure enlarged schematic view of sealing ring assembly in

[0019] Figure 4 is Figure 2 Sectional view of left die in

[0020] The specific structure corresponding to the number is as follows:

[0021] Cylinder 1, cylinder nut 2, sealing ring assembly 3, sealing ring support ring 31, air bag 32, inflation hole 33, sealing ring 34, lower mold 4, left mold 41, right mold 42, feeding section 51, circular deformation section 52, stress relaxation section 53, film separation expansion section 54, flat deformation section 55, discharging section 56,

[0022] The following specific embodiments will further illustrate the utility model in conjunction with the above-mentioned drawings. Embodiment

[0023] Specific implementation case 1:

[0024] A paste extrusion die, comprising: cylinder 1, cylinder nut 2, sealing ring assembly 3, lower mold 4, the cylinder 1 is fixedly connected with the end of the lower mold 4 through the cylinder nut 2, the lower mold 4 includes left mold 41 and right mold 42, the structure of the left mold 41 and the right mold 42 is symmetrical, the inner wall surface of the left mold 41 and the right mold 42 is combined into an extrusion inner cavity, and the sealing ring assembly 3 is arranged at the intersection of the cylinder 1 and the lower mold 4. The above-mentioned extrusion die makes an integral design on the flow channel between the cylindrical embryo feeding port and the flat base band discharging port, that is, it solves the problems of inconsistent base band density and poor film strength caused by circular die molding, and also avoids the problem of poor surface quality of the base band caused by the separated flat die.

[0025] The extrusion inner cavity of the lower mold 4 includes feeding section 51, circular deformation section 52, stress relaxation section 53, film separation expansion section 54, flat deformation section 55 and discharging section 56 in sequence from the feeding end to the discharging end.

[0026] The feeding section 51 is a paste-like fluid feeding section, and the fluid has no deformation;

[0027] In the circular deformation section 52, the fluid presents fibrosis under the action of pushing force, forming smaller cylindrical embryo materials; at this time, the strength and stretchability of the embryo materials are significantly improved, and there is a higher internal stress in the material.

[0028] In the stress relaxation section 53, the internal stress of the fluid is eliminated, so that the subsequent deformation process is stable;

[0029] The film separation expansion section 54 is used for storing the material after film separation expansion, and the material enters the next deformation zone after its size is stable; there is internal stress in the material during the extrusion process, and the material will expand when it leaves the extrusion die.

[0030] In the flat deformation section 55, the material inlet and outlet present a flat shape, and the thickness of the material gradually decreases and the width gradually increases, forming a base band with appropriate width, thickness and high strength.

[0031] The baseband in the discharge section 56 will smoothly leave the mold.

[0032] Optionally, the inner wall of the sealing ring assembly 3 is flush with the inner wall of the feed section 51, and the sealing ring assembly is located at the front end of the feed section 51. Since the fluid is not subjected to pushing force and will not deform before entering the circular deformation section 52 in the lower mold, the sealing ring assembly 3 ensures that the fluid does not leak during the flow from the cylinder 1 to the lower mold 4, and also prevents the stepped surface caused by the machining error or assembly error between the sealing ring assembly 3 and the lower mold 4 from affecting the surface flatness of the base strip. If the sealing ring is damaged due to friction, it is easy to replace.

[0033] The feeding section 51 is a cylindrical structure with the same dimensions as the feed inlet of the cylinder 1. The circular deformation section 52 is a conical structure, and the planar angle α of the circular deformation section 52 is 35° to 65°; optionally, α is 45°. The stress relaxation section 53 is a cylindrical structure, and the length-to-diameter ratio L / D of the stress relaxation section 53 is 2 to 4; optionally, the length-to-diameter ratio L of the stress relaxation section 53 is 43.8 mm, D is 21.3 mm, and the length-to-diameter ratio L / D is 2.05.

[0034] Furthermore, the membrane expansion section 54 has a side-band arc-shaped flow channel structure. The ratio of the outlet cross-sectional area to the inlet cross-sectional area of ​​the membrane expansion section 54, S1 / S0, is 1.2 to 1.5, and optionally, S1 / S0 is 1.35. The side-band arc-shaped flow channel conforms to the material flow characteristics, has better fit with the material, and can meet the requirements for fluid expansion storage and dimensional stability under internal stress.

[0035] Furthermore, the horizontal angle β1 of the flat deformation segment 55 is 25° to 30° and the vertical angle β2 is 0.6° to 2°. Optionally, β1 is 26.6° and the vertical angle β2 is 1.2°.

[0036] Furthermore, the discharge section 56 is a flat rectangular structure, and the height h of the discharge section 56 is between 1mm and 2mm, and optionally, h is 1.5mm.

[0037] Specific Implementation Case 2:

[0038] Based on Specific Implementation Case 1, the sealing ring assembly 3 includes a sealing ring support ring 31, an airbag 32, an inflation port 33, and a sealing ring 34. The sealing ring support ring 31 is disposed on the sealing ring mounting end face of the cylinder 1. The cylinder 1 is machined with an inflation port 33 that communicates with the air inlet of the airbag 32. The airbag 32 is disposed within the support space of the sealing ring support ring 31, and the air inlet of the airbag 32 is connected to the air source through an air inlet pipe. The airbag 32 is clamped within the sealing ring support ring 31 by increasing its inflation volume, and the portion extending outside the sealing ring support ring 31 abuts against the end face of the sealing ring 34. The contact method between the airbag 32 and the sealing ring 34 can improve the sealing effect.

[0039] Furthermore, the sealing ring assembly 3 also includes a detection branch pipe connected to the air intake pipe. The detection branch pipe is connected to a pressure sensor, which can detect the air pressure in the airbag 32 in real time. After the sealing ring 34 is installed, air can be blown into the airbag 32 to make the airbag 32 fit tightly against the end face of the sealing ring 34. When the air pressure in the airbag 32 reaches a certain value, the air supply stops. During subsequent use, the pressure sensor can detect changes in the air pressure value in the airbag 32. When the air pressure value is lower than a certain value, it can be inferred that the sealing performance of the sealing ring 34 is unqualified (the air pressure in the airbag 32 is itself detected under the pressure of the sealing ring), and the machine needs to be stopped for inspection or the sealing ring 34 needs to be replaced.

[0040] Optionally, the intersection points of the feeding section 51 and the circular deformation section 52, the circular deformation section 52 and the stress relaxation section 53, and the discharge port of the discharge section 56 are all machined with chamfered structures.

[0041] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A paste extrusion mold, characterized in that: The device includes a cylinder barrel, a cylinder barrel nut, a sealing ring assembly, and a lower die. The cylinder barrel is fixedly connected to the end of the lower die via the cylinder barrel nut. The lower die includes a left die and a right die. The left and right dies have symmetrical structures, and their inner wall surfaces combine to form an extrusion cavity. The sealing ring assembly is located at the junction of the cylinder barrel and the lower die.

2. The paste extrusion mold as described in claim 1, characterized in that: The extrusion cavity of the lower die, from the feed end to the discharge end, includes, in sequence, a feed section, a circular deformation section, a stress relaxation section, a separation expansion section, a flat deformation section, and a discharge section.

3. The paste extrusion mold as described in claim 2, characterized in that: The inner wall of the sealing ring assembly is flush with the inner wall of the feeding section, and the sealing ring assembly is located at the front end of the feeding section.

4. The paste extrusion mold as described in claim 1, characterized in that: The sealing ring assembly includes a sealing ring support ring, an airbag, an inflation port, and a sealing ring. The sealing ring support ring is disposed on the sealing ring mounting end face of the cylinder. The cylinder is machined with an inflation port that communicates with the airbag inlet. The airbag is disposed within the support space of the sealing ring support ring, and the airbag inlet is connected to an air source through an air inlet pipe.

5. The paste extrusion mold as described in claim 4, characterized in that: The sealing ring assembly also includes a detection branch pipe connected to the air intake pipe. The detection branch pipe is connected to a pressure sensor and can detect the air pressure in the airbag in real time.

6. The paste extrusion mold as described in claim 2, characterized in that: The feeding section is a cylindrical structure with the same dimensions as the cylinder feed inlet, and the circular deformation section is a conical structure with a planar angle α of 35° to 65°.

7. The paste extrusion mold as described in claim 2, characterized in that: The stress relaxation section is a cylindrical structure with a length-to-diameter ratio (L / D) of 2 to 4.

8. The paste extrusion mold as described in claim 2, characterized in that: The membrane expansion section has a side-band arc-shaped flow channel structure, and the ratio of the outlet cross-sectional area to the inlet cross-sectional area of ​​the membrane expansion section, S1 / S0, is 1.2 to 1.

5.

9. The paste extrusion mold as described in claim 2, characterized in that: The horizontal angle β1 of the flat deformation segment is 25° to 30°, and the vertical angle β2 is 0.6° to 2°.

10. A paste extrusion mold as described in claim 2, characterized in that: The discharge section is a flat rectangular structure with a height h between 1mm and 2mm. The intersection points of the feeding section and the circular deformation section, the circular deformation section and the stress relaxation section, and the discharge port of the discharge section are all machined with chamfered structures.

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