Cleaning mat for horizontal extruder

Abstract

This utility model relates to a cleaning die pad for a horizontal extruder, comprising a die pad body coaxially disposed at the end of a perforating needle. The die pad body is annular, with its outer diameter smaller than the inner diameter of the extrusion cylinder to avoid direct contact and wear. The central hole of the die pad body is a stepped hole, comprising a small-diameter section, a large-diameter section, and a tapered section. Large-diameter sections are symmetrically arranged at both ends of the small-diameter section, and a tapered section is provided at one end of each large-diameter section, extending outward to the end face of the die pad body. The end of the perforating needle passes through one of the tapered sections and is inserted into the corresponding large-diameter section. The inner diameter of the large-diameter section is the same as the outer diameter of the perforating needle, and the insertion method facilitates the installation of the die pad body on the perforating needle. The die pad body of this utility model is coaxially mounted at the end of the perforating needle, ensuring that the die pad body remains centered within the extrusion cylinder. Using a centered die pad body enhances the cleaning effect and avoids wear on the inner wall of the extrusion cylinder.

Description

Technical Field

[0001] This utility model relates to the field of horizontal extrusion press technology, and in particular to a cleaning die pad for a horizontal extrusion press. Background Technology

[0002] Horizontal extrusion presses are commonly used in the hot extrusion of non-ferrous metals. The main extrusion tools of a horizontal extrusion press include a needle support, a needle bearing mounted in front of the needle support, a piercing needle mounted in front of the needle bearing, and a hollow extrusion rod slidably fitted around the outside of the needle bearing and the piercing needle. It also includes an extrusion die pad, an extrusion cylinder, and an extrusion die.

[0003] During operation of the horizontal extrusion press, a cylindrical billet is heated to a suitable deformation temperature and placed horizontally into the extrusion cylinder, with an extrusion die pad placed at one end. The hollow extrusion rod moves to the right and presses against the extrusion die pad, thus confining the billet within the extrusion cylinder. Then, a piercing needle moves to the right, passes through the center of the extrusion die pad, and punches a hole in the billet. The piercing needle pushes the billet out of the die orifice. With the hollow extrusion rod stationary, the extrusion cylinder and extrusion die move to the left, continuously extruding the billet within the extrusion cylinder through the die orifice to form the desired shape. Figure 1 As shown.

[0004] The above-described billet processing method is called the peeling extrusion method. Because the outer diameter of the extrusion die pad is approximately 2-3 mm smaller than the inner diameter of the extrusion cylinder, during the extrusion process, the surface metal of the billet is cut off by the extrusion die pad and remains inside the extrusion cylinder. In other words, the extrusion die pad can extrude the central part of the billet, while the outer skin of the billet, forming a complete cylinder along with the pressure residue, remains inside the extrusion cylinder, creating a peeling cylinder. The wall thickness of the peeling cylinder depends on the gap between the extrusion die pad and the extrusion cylinder, and is also approximately 2-3 mm.

[0005] After each peeling and extrusion, the remaining peeling cartridge must be completely cleaned to prevent it from being pressed into the product during the next extrusion. Cleaning requires a cleaning die pad, which is typically a simple circular ring with an outer diameter slightly smaller than the inner diameter of the extrusion cylinder. After separating the extrusion cylinder from the extrusion die, the cleaning die pad is placed inside the extrusion cylinder. The cleaning process is then performed by moving the hollow extrusion rod to the right, pushing the cleaning die pad within the extrusion cylinder. Figure 2 As shown.

[0006] However, because the cleaning die pad is submerged in the extrusion cylinder during operation—meaning it's directly placed in the lower part of the cylinder—there's a significant gap between the cleaning die pad and the upper part of the cylinder. In short, it's difficult to keep the cleaning die pad centered within the cylinder. As a result, during peeling, residual material from the lower part of the cylinder may escape, while residue from the upper part tends to remain, leading to incomplete cleaning. During subsequent extrusion production, this residual material can be squeezed into the finished product, causing defects and quality issues with the extruded product.

[0007] Furthermore, the cleaning die pad contacts the lower part of the extrusion cylinder, causing the inner diameter of the extrusion cylinder and the outer diameter of the cleaning die pad to wear out relatively quickly. Since the cleaning die pad is placed eccentrically inside the extrusion cylinder, it may also get stuck during movement, which will cause significant wear to the inner wall of the extrusion cylinder. Summary of the Invention

[0008] To address the problem that conventional cleaning die pads are difficult to keep centered within the extrusion cylinder, resulting in incomplete cleaning of residual material, this invention provides a cleaning die pad for a horizontal extruder. The cleaning die pad structure is optimized by coaxially mounting it at the end of the piercing needle. Since the piercing needle is coaxial with the extrusion cylinder, the cleaning die pad can be located at the center of the extrusion cylinder, which can avoid uneven wear and allow the peeling cylinder to be completely ejected.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] A cleaning die pad for a horizontal extruder includes a die pad body coaxially disposed at the end of a perforating needle. The die pad body is an annular body, and the outer diameter of the die pad body is smaller than the inner diameter of the extrusion cylinder to avoid direct contact and wear.

[0011] The central hole of the mold pad body is a stepped hole, which includes a small diameter section, a large diameter section and a tapered hole section. The large diameter section is symmetrically arranged at both ends of the small diameter section, and the tapered hole section is arranged at one end of each large diameter section. The tapered hole section extends outward to the end face of the mold pad body.

[0012] After the end of the perforating needle passes through one of the tapered hole sections, it is inserted into the corresponding large diameter section. The inner diameter of the large diameter section is the same as the outer diameter of the perforating needle. The insertion method makes it convenient for the mold pad body to be installed on the perforating needle.

[0013] Furthermore, the inner diameters of the tapered section, the large-diameter section, and the small-diameter section decrease sequentially, and the tapered section, the large-diameter section, and the small-diameter section connect and penetrate the mold pad body. The tapered section facilitates the insertion of the end of the perforating needle into the large-diameter section.

[0014] Furthermore, the die pad body is a ring structure made of die steel, and the outer diameter of the die pad body is 1~2mm smaller than the inner diameter of the extrusion cylinder, which facilitates the proper cleaning of residual material on the inner wall of the extrusion cylinder.

[0015] Furthermore, wear-resistant rings are snapped onto both ends of the mold pad body. These wear-resistant rings are replaceable, with one end face flush with the end face of the mold pad body, and the outer diameter of the wear-resistant ring is greater than or equal to the outer diameter of the mold pad body. Wear-resistant rings of appropriate sizes can be selected for extrusion cylinders of different ages and conditions.

[0016] Furthermore, there is a gap between the two wear-resistant rings, and the sum of the thicknesses of the two wear-resistant rings is less than the thickness of the mold pad body.

[0017] Furthermore, the mold pad body has slots at both ends. The slots extend from the end face of the mold pad body along the axial direction of the mold pad body, which facilitates the installation space for the wear-resistant ring. The two slots extend in opposite directions. The inner sidewall of the slot is prismatic, and the inner sidewall of the wear-resistant ring is prismatic. The wear-resistant ring is engaged in the slot, which effectively restricts the circumferential rotation of the wear-resistant ring.

[0018] Furthermore, multiple positioning beads are evenly arranged on the inner sidewall of the slot, and multiple positioning grooves are evenly opened on the inner sidewall of the wear-resistant ring. The positioning beads and positioning grooves correspond one-to-one, and the heads of the corresponding positioning beads are inserted into the positioning grooves, effectively restricting the axial movement of the wear-resistant ring.

[0019] The beneficial effects of this utility model through the above technical solution are:

[0020] This utility model features a rational structural design. Compared to conventional methods where the cleaning pad is placed directly inside the extrusion cylinder and moved by a hollow extrusion rod to clean residual material, the optimized design uses a stepped hole in the center of the cleaning pad body. This allows the pad body to be easily inserted into the perforating needle and maintain coaxiality with it. Because the perforating needle and extrusion cylinder are coaxially arranged, the pad body remains centered within the cylinder, ensuring concentricity of the pad body, perforating needle, and extrusion cylinder. This allows the extruded residual material to form a complete cylindrical structure. The improved cleaning pad avoids hard scratches on the inside of the extrusion cylinder, reduces wear on the cylinder, and cleans the residual material more thoroughly.

[0021] This invention addresses the issue of easily worn die pads by proposing replaceable wear rings. Wear rings are detachably connected to both ends of the die pad, allowing the die pad to be recycled. The wear rings are used to push out residual material, and can be easily replaced when they become worn and unusable. Two sizes of wear rings are available: a larger size is used when the inner wall of the extrusion cylinder wears down after prolonged use, and a smaller size is used otherwise. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the billet extrusion state in a horizontal extrusion press.

[0023] Figure 2 This is a schematic diagram showing the application of a conventional cleaning die pad on a horizontal extruder before and after cleaning.

[0024] Figure 3 This is a schematic diagram illustrating the application state of the cleaning die pad for the horizontal extruder of this utility model.

[0025] Figure 4 This is a schematic diagram of the die pad body for the cleaning die pad of the horizontal extruder of this utility model.

[0026] Figure 5This is a schematic diagram of the wear-resistant ring installation in Embodiment 2 of the cleaning die pad for the horizontal extruder of this utility model.

[0027] Figure 6 This is a schematic diagram showing the disassembly of the wear-resistant ring in Embodiment 2 of the cleaning die pad for the horizontal extruder of this utility model.

[0028] The attached diagram is labeled as follows: 1. Needle support seat, 2. Needle support, 3. Piercing needle, 4. Hollow extrusion rod, 5. Extrusion die pad, 6. Extrusion cylinder, 7. Extrusion die, 8. Billet, 9. Peeling cylinder, 10. Cleaning die pad, 11. Die pad body, 12. Small diameter section, 13. Large diameter section, 14. Tapered hole section, 15. Wear-resistant ring, 16. Slot, 17. Positioning bead, 18. Positioning groove. Detailed Implementation

[0029] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings:

[0030] Example 1:

[0031] like Figures 3-4 As shown, the cleaning die pad for the horizontal extruder includes a die pad body 11 coaxially disposed at the end of the piercing needle 3. That is, the die pad body 11 is detachably connected to the end of the piercing needle 3, and after installation, the die pad body 11 maintains a coaxial arrangement with the piercing needle 3. Since the piercing needle 3 is coaxial with the extrusion cylinder 6 in the prior art, the die pad body 11 can naturally be centered within the extrusion cylinder 6.

[0032] Here, the mold pad body 11 is a ring with a central hole. Specifically, the mold pad body 11 is a ring structure made of mold steel. The outer wall of the mold pad body 11 is a smooth cylindrical surface. The outer diameter of the mold pad body 11 is smaller than the inner diameter of the extrusion cylinder 6, and the outer diameter of the mold pad body 11 is 1~2mm smaller than the inner diameter of the extrusion cylinder 6, in order to prevent the mold pad body 11 from contacting the inner wall of the extrusion cylinder 6 and causing wear as much as possible.

[0033] It should be noted that the central hole of the mold pad body 11 is not a straight hole, but a stepped hole. Specifically, the central hole of the mold pad body 11 includes a small diameter section 12, a large diameter section 13, and a tapered hole section 14. Large diameter sections 13 are symmetrically arranged at both ends of the small diameter section 12, and both the small diameter section 12 and the large diameter section 13 are circular holes. A tapered hole section 14 is provided at one end of each large diameter section 13, extending outward to the end face of the mold pad body 11. The inner diameters of the tapered hole section 14, the large diameter section 13, and the small diameter section 12 decrease sequentially. Since the central hole penetrates the mold pad body 11, the tapered hole section 14, the large diameter section 13, and the small diameter section 12 connect and penetrate the mold pad body 11.

[0034] In application, during the residual material pushing operation, the end of the perforating needle 3 passes through one of the tapered hole sections 14 and is inserted into the corresponding large-diameter section 13. The inner diameter of the large-diameter section 13 is consistent with the outer diameter of the perforating needle 3, and then the mold pad body 11 is installed at the end of the perforating needle 3. At this time, the mold pad body 11, the perforating needle 3, and the extrusion cylinder 6 are coaxial. After the perforating needle 3 moves to the right, it drives the mold pad body 11 to move to the right. The mold pad body 11 is centered in the extrusion cylinder 6. The residual material pushed out by the moving mold pad body 11 can form a complete cylindrical structure, ensuring that the residual material is cleaned more thoroughly. Moreover, the mold pad body 11 does not directly contact and wear with the extrusion cylinder 6.

[0035] Since the mold pad body 11 has an axisymmetric structure, when installing the mold pad body 11 and the end of the piercing pin 3, either end of the mold pad body 11 can be selected to be installed with the piercing pin 3. In this way, when one end of the mold pad body 11 is frequently used and wears out, the other end of the mold pad body 11 can be selected to clean the residual material.

[0036] Example 2:

[0037] This embodiment is basically the same as Embodiment 1, and the similarities will not be repeated. The differences are as follows: Figures 5-6 As shown, in order to increase the service life of the mold pad body 11, wear-resistant rings 15 are snapped onto both ends of the mold pad body 11. The wear-resistant rings 15 are also circular rings made of mold steel. There is a gap between the two wear-resistant rings 15, and the sum of the thicknesses of the two wear-resistant rings 15 is less than the thickness of the mold pad body 11.

[0038] The wear ring 15 is detachably connected to the mold pad body 11, thus the wear ring 15 is replaceable. By using the wear ring 15 to directly contact the residual material to push it out, the mold pad body 11 can be kept away from contact with the residual material. When the wear ring 15 wears out, it can be replaced with a new one, avoiding the need to replace the mold pad body 11.

[0039] During installation, the wear-resistant ring 15 has slots 16 at both ends of the mold pad body 11. The slots 16 extend from the end face of the mold pad body 11 along the axial direction of the mold pad body 11, with the two slots 16 extending in opposite directions. This results in a smaller outer diameter at both ends and a larger outer diameter in the middle of the mold pad body 11. The inner wall of the slot 16 is hexagonal prism-shaped, and the inner wall of the wear-resistant ring 15 is also hexagonal prism-shaped. The wear-resistant ring 15 is engaged in the slot 16 to prevent circumferential rotation.

[0040] To prevent axial movement of the wear ring 15, six positioning beads 17 are evenly arranged on the inner wall of the slot 16, and six positioning grooves 18 are evenly formed on the inner wall of the wear ring 15. The positioning grooves 18 are spherical grooves, and the six positioning beads 17 and the six positioning grooves 18 correspond one-to-one. The heads of the corresponding positioning beads 17 are engaged in the positioning grooves 18, which can prevent the wear ring 15 from moving axially on the mold pad body 11. By restricting circumferential rotation and axial movement, the disassembly and assembly of the wear ring 15 can be facilitated, and the secure installation of the wear ring 15 can be ensured.

[0041] After the wear ring 15 is installed, one end face of the wear ring 15 is flush with the end face of the mold pad body 11. The outer diameter of the wear ring 15 is greater than or equal to the outer diameter of the mold pad body 11. Therefore, the wear ring 15 has two size specifications: the first is that the outer diameter of the wear ring 15 is equal to the outer diameter of the mold pad body 11, and the second is that the outer diameter of the wear ring 15 is slightly larger than the outer diameter of the mold pad body 11.

[0042] For the new extrusion cylinder 6, the first type of wear-resistant ring 15 can be installed on the mold pad body 11; for the extrusion cylinder 6 with inner wall wear after long-term use and its inner diameter increased, the second type of wear-resistant ring 15 is installed on the mold pad body 11.

[0043] Therefore, the entire mold pad body 11 has a replaceable wear ring 15, which is used to push out residual material. When the outer circumference of the wear ring 15 becomes worn and can no longer be used, a new wear ring 15 can be replaced, and the mold pad body 11 can still be used, effectively dealing with the situation where the outer diameter of the mold pad body 11 wears quickly. Moreover, the wear ring 15 is disassembled by snap-fit, making the replacement and installation operations more convenient and quick.

[0044] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A cleaning die pad for a horizontal extruder, characterized in that, Includes a mold pad body (11) coaxially disposed at the end of the perforating needle (3), wherein the mold pad body (11) is an annular body and the outer diameter of the mold pad body (11) is smaller than the inner diameter of the extrusion cylinder (6); The central hole of the mold pad body (11) is a stepped hole. The central hole of the mold pad body (11) includes a small diameter section (12), a large diameter section (13) and a tapered hole section (14). The large diameter section (13) is symmetrically arranged at both ends of the small diameter section (12). The tapered hole section (14) is arranged at one end of each large diameter section (13). The tapered hole section (14) extends outward to the end face of the mold pad body (11). After the end of the perforating needle (3) passes through one of the tapered hole sections (14), it is inserted into the corresponding large diameter section (13), and the inner diameter of the large diameter section (13) is consistent with the outer diameter of the perforating needle (3).

2. The cleaning die pad for a horizontal extruder according to claim 1, characterized in that, The inner diameters of the tapered hole section (14), the large diameter section (13), and the small diameter section (12) decrease sequentially, and the tapered hole section (14), the large diameter section (13), and the small diameter section (12) are connected and penetrate through the mold pad body (11).

3. The cleaning die pad for a horizontal extruder according to claim 1, characterized in that, The mold pad body (11) is a ring structure made of mold steel, and the outer diameter of the mold pad body (11) is 1~2mm smaller than the inner diameter of the extrusion cylinder (6).

4. The cleaning die pad for a horizontal extruder according to claim 1, characterized in that, Wear-resistant rings (15) are snapped onto both ends of the mold pad body (11). One end face of the wear-resistant ring (15) is flush with the end face of the mold pad body (11), and the outer diameter of the wear-resistant ring (15) is greater than or equal to the outer diameter of the mold pad body (11).

5. The cleaning die pad for a horizontal extruder according to claim 4, characterized in that, There is a gap between the two wear rings (15), and the sum of the thicknesses of the two wear rings (15) is less than the thickness of the mold pad body (11).

6. The cleaning die pad for a horizontal extruder according to claim 4, characterized in that, The mold pad body (11) has slots (16) at both ends. The slots (16) extend from the end face of the mold pad body (11) and along the axial direction of the mold pad body (11). The two slots (16) extend in opposite directions. The inner sidewall of the slot (16) is prismatic. The inner sidewall of the wear-resistant ring (15) is prismatic. The wear-resistant ring (15) is engaged in the slot (16).

7. The cleaning die pad for a horizontal extruder according to claim 6, characterized in that, Multiple positioning beads (17) are evenly arranged on the inner sidewall of the slot (16), and multiple positioning grooves (18) are evenly opened on the inner sidewall of the wear-resistant ring (15). The positioning beads (17) and the positioning grooves (18) correspond one to one, and the head of the corresponding positioning bead (17) is inserted into the positioning groove (18).

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