A new flat extrusion cylinder structure

Abstract

The present invention provides a novel flat extrusion cylinder structure. The extrusion cylinder is a multi-layer cylinder structure. The inner cylinder has a flat and elongated extrusion hole. The layers of cylinders are assembled in an approximately rectangular manner. The long and short sides of the rectangles are fitted with different interference fits to generate different assembly prestresses in the vertical and horizontal directions. Combined with the approximately rectangular or approximately hexagonal outer contour structure of the outer cylinder, the uncoordinated deformation and local stress concentration during the operation of the flat extrusion cylinder are reduced, thereby improving the service life of the flat extrusion cylinder.

Description

Technical Field

[0001] This invention belongs to the field of metal plastic processing equipment and relates to a novel flat extrusion cylinder structure for extrusion presses. Background Technology

[0002] Current metal extrusion presses typically employ a multi-layered extrusion cylinder structure. The inner cylinder has a flat, round extrusion orifice, while the outermost cylinder has a circular outer shell, with each layer connected by a circular hole. During extrusion, the flat, round extrusion orifice of the inner cylinder experiences significant stress differences in the vertical and horizontal directions. Furthermore, the material thickness of the extrusion cylinder in the horizontal direction is much smaller than that in the vertical direction (typically a ratio less than 0.8), leading to substantial stress concentration near the inner orifice in the horizontal direction. This results in a reduced cylinder lifespan. To address these challenges, a novel flat extrusion cylinder structure is urgently needed. Summary of the Invention

[0003] The purpose of this invention is to provide a novel flat extrusion cylinder structure. Based on the stress condition of the inner bore of the extrusion cylinder, a non-circular profile shape and a novel assembly relationship are developed for the extrusion cylinder. The material distribution of the extrusion cylinder in the horizontal and vertical directions is adjusted so that the material ratio in the horizontal and vertical directions is greater than or equal to 1, thereby solving the industry problem of short service life of circular profile flat extrusion cylinders caused by stress concentration.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A novel flat extrusion cylinder structure, wherein the extrusion cylinder structure is a multi-layer cylinder structure, including an inner cylinder 1 and an outer cylinder 3;

[0006] The inner cylinder 1 has a flat and elongated extrusion hole, and the outer contour of the inner cylinder 1 is approximately rectangular, with the four corners of the rectangle designed as rounded corners; the inner hole of the outer cylinder 3 is consistent with the outer contour shape of the inner cylinder 1, and the outer contour of the outer cylinder 3 is a hexagonal structure or approximately rectangular.

[0007] The material distribution ratio of the extrusion cylinder structure in the horizontal direction to the vertical direction is greater than or equal to 1.

[0008] Furthermore, the extrusion cylinder structure also includes at least one middle cylinder 2;

[0009] The at least one middle cylinder 2 is disposed between the inner cylinder 1 and the outer cylinder 3.

[0010] Furthermore, when there is only one layer of middle tube 2;

[0011] The inner hole of the first-layer middle cylinder 2 is consistent with the outer contour shape of the inner cylinder 1. The outer contour of the first-layer middle cylinder 2 is approximately rectangular, and the four corners of the rectangle are designed as rounded corners. The inner hole of the outer cylinder 3 is consistent with the outer contour shape of the first-layer middle cylinder 2. The outer contour of the outer cylinder 3 is approximately rectangular or hexagonal.

[0012] Furthermore, during the assembly of the inner cylinder 1 and the middle cylinder 2, the long side 5 and the short side 4 of the outer contour of the inner cylinder 1 are fitted with different degrees of interference fit, so that the vertical direction of the short side 4 and the horizontal direction of the long side 5 generate different assembly prestresses.

[0013] Furthermore, during the assembly of the middle cylinder 2 and the outer cylinder 3, different interference fits are adopted on the long and short sides of the outer contour of the middle cylinder 2, so that different assembly prestresses are generated in the vertical direction where the short side of the outer contour of the middle cylinder is located and the horizontal direction where the long side is located.

[0014] Furthermore, when there are multiple layers of inner tubes;

[0015] The innermost middle cylinder has the same inner diameter as the outer contour of the inner cylinder 1. The outer contour of the multi-layer middle cylinder is approximately rectangular, and the four corners of the rectangle are designed as rounded corners. The inner diameter of the outer cylinder 3 has the same outer contour as the outermost middle cylinder. The outer contour of the outer cylinder 3 is approximately rectangular or hexagonal.

[0016] The assembly rules between the inner cylinders are the same as those between the inner cylinder, middle cylinder, and outer cylinder when there is only one middle cylinder.

[0017] The advantages of this invention are: 1. Compared to the current circular outline, the approximately rectangular or hexagonal outer contour of the outer cylinder 3 is more suitable for the flat extrusion production process, reducing the uncoordinated deformation during extrusion cylinder operation; 2. The long side 5 and short side 4 of the rectangle for each cylinder layer can be designed with different interference fits according to the stress conditions, generating different assembly prestresses in the vertical and horizontal directions, further reducing the uncoordinated deformation during extrusion cylinder operation; 3. The structure is simple and easy to design and manufacture. Through the above measures, the deformation incoordination and local stress concentration caused by unbalanced forces during flat extrusion cylinder operation will be significantly reduced, thereby improving the service life of the flat extrusion cylinder. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a novel flat extrusion cylinder structure according to the present invention, wherein the outer contour of the outer cylinder 3 is an approximately rectangular structure;

[0019] Figure 2 This is a schematic diagram of a novel flat extrusion cylinder structure according to the present invention, wherein the outer cylinder 3 has a hexagonal outer contour.

[0020] In the diagram, 1. Inner cylinder; 2. Middle cylinder; 3. Outer cylinder; 4. Short side; 5. Long side. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] The accompanying drawings illustrate a three-layer cylinder structure, but this does not limit the invention to three-layer cylinder structures. The invention is applicable to multi-layer cylinder structures without any change.

[0023] This invention provides a novel flat extrusion cylinder structure. Based on the stress condition of the inner bore of the extrusion cylinder, a non-circular profile shape and a novel assembly relationship are developed for the extrusion cylinder. The material distribution of the extrusion cylinder in the horizontal and vertical directions is adjusted so that the material ratio in the horizontal and vertical directions is greater than or equal to 1, thereby solving the industry problem of short service life of circular profile flat extrusion cylinders caused by stress concentration.

[0024] This invention discloses a novel flat extrusion cylinder structure, wherein the extrusion cylinder is a multi-layer cylinder structure, such as... Figure 1 and Figure 2 As shown, it includes an inner cylinder 1, a middle cylinder 2, and an outer cylinder 3.

[0025] The inner cylinder 1 has a flat, elongated extrusion hole. The outer contour of the inner cylinder 1 is approximately rectangular, with rounded corners designed to reduce stress concentration. The inner bore of the middle cylinder 2 matches the outer contour of the inner cylinder 1, and the outer contour of the middle cylinder 2 is also approximately rectangular, with rounded corners designed to reduce stress concentration. The inner bore of the outer cylinder 3 matches the outer contour of the middle cylinder 2, and the outer contour of the outer cylinder 3 is approximately rectangular or hexagonal. During assembly between the inner cylinder 1 and the middle cylinder 2, the long side 5 and short side 4 of the rectangle can be fitted with different interference fits depending on the stress conditions, resulting in different assembly prestresses in the vertical and horizontal directions.

[0026] Similarly, when assembling the middle cylinder 2 and the outer cylinder 3, the long and short sides of the rectangle can be fitted with different interference fits according to the stress conditions, resulting in different assembly prestresses in the vertical and horizontal directions. The difference in assembly prestresses in the vertical and horizontal directions, combined with the approximately rectangular or hexagonal outer contour shape of the outer cylinder 3, will effectively offset the deformation incoordination and local stress concentration caused by the unbalanced stress during the operation of the flat extrusion cylinder, thereby improving the service life of the flat extrusion cylinder.

[0027] When the extrusion cylinder has a two-layer cylinder structure, with the inner cylinder 1 remaining unchanged, the inner hole of the outer cylinder 3 has the same shape as the outer contour of the inner cylinder 1, and the outer contour of the outer cylinder 3 is an approximately rectangular or hexagonal structure. The assembly of the outer cylinder 3 and the inner cylinder 1 is analogous to the assembly between the inner cylinder 1 and the middle cylinder 2 in a multi-layer cylinder.

[0028] When the number of extrusion cylinder layers is greater than 3, the number of middle cylinder layers is increased accordingly. However, the shape characteristics and assembly prestressing principle of the newly added middle cylinder are consistent with the middle cylinder 2 described above.

[0029] The novel flat extrusion cylinder structure provided by this invention, compared to the current circular outline, features an outer cylinder 3 with an approximate rectangular or hexagonal outer contour shape, which is more suitable for flat extrusion production processes and can reduce uncoordinated deformation during operation. The long side 5 and short side 4 of the rectangle used for mounting each cylinder layer can be designed with different interference fits according to the stress conditions, generating different assembly prestresses in the vertical and horizontal directions, further reducing uncoordinated deformation during operation. The structure is simple and easy to design and manufacture. Through these measures, the deformation incoordination and localized stress concentration caused by unbalanced forces during flat extrusion cylinder operation will be significantly reduced, thereby extending the service life of the flat extrusion cylinder.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A novel flat extrusion cylinder structure, characterized in that, The extrusion cylinder structure is a multi-layer cylinder structure, including an inner cylinder (1) and an outer cylinder (3). The inner cylinder (1) has a flat and elongated extrusion hole. The outer contour of the inner cylinder (1) is approximately rectangular, and the four corners of the rectangle are designed as rounded corners. The inner hole of the outer cylinder (3) is consistent with the outer contour shape of the inner cylinder (1). The outer contour of the outer cylinder (3) is a hexagonal structure or approximately rectangular. The material distribution ratio of the extrusion cylinder structure in the horizontal direction to the vertical direction is greater than or equal to 1.

2. The novel flat extrusion cylinder structure according to claim 1, characterized in that, The extrusion cylinder structure also includes at least one middle cylinder (2); The at least one middle cylinder (2) is disposed between the inner cylinder (1) and the outer cylinder (3).

3. The novel flat extrusion cylinder structure according to claim 2, characterized in that, When there is only one layer of middle tube (2); The inner hole of the middle cylinder (2) is consistent with the outer contour shape of the inner cylinder (1). The outer contour of the middle cylinder (2) is approximately rectangular, and the four corners of the rectangle are designed as rounded corners. The inner hole of the outer cylinder (3) is consistent with the outer contour shape of the middle cylinder (2). The outer contour of the outer cylinder (3) is approximately rectangular or hexagonal.

4. The novel flat extrusion cylinder structure according to claim 3, characterized in that, When assembling the inner cylinder (1) and the middle cylinder (2), the long side (5) and the short side (4) of the outer contour of the inner cylinder (1) are fitted with different degrees of interference, so that different assembly prestresses are generated in the vertical direction where the short side (4) is located and the horizontal direction where the long side (5) is located.

5. A novel flat extrusion cylinder structure according to claim 3, characterized in that, When assembling the middle cylinder (2) and the outer cylinder (3), different interference fits are adopted on the long side and the short side of the outer contour of the middle cylinder (2) so that different assembly prestresses are generated in the vertical direction where the short side of the outer contour of the middle cylinder is located and the horizontal direction where the long side is located.

6. The novel flat extrusion cylinder structure according to claim 5, characterized in that, When there are multiple layers of middle tubes; The innermost middle cylinder has the same inner hole shape as the outer contour of the inner cylinder (1). The outer contour of the multi-layer middle cylinder is approximately rectangular, and the four corners of the rectangle are designed as rounded corners. The inner hole of the outer cylinder (3) has the same outer contour shape as the outermost middle cylinder. The outer contour of the outer cylinder (3) is approximately rectangular or hexagonal. The assembly rules between the inner cylinders are the same as those between the inner cylinder, middle cylinder, and outer cylinder when there is only one middle cylinder.

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