An improved expansion hole rolling roller

Abstract

This utility model relates to the field of machining technology and discloses an improved expansion rolling wheel, including a wheel body. The rolling surface of the wheel body has a trapezoidal groove in the middle, and the inner wall of the trapezoidal groove is symmetrically provided with isosceles surfaces. The cross-section of the trapezoidal groove is an isosceles trapezoid. This utility model effectively solves the problem of incomplete expansion caused by traditional flat rolling wheels by setting a trapezoidal groove in the middle of the rolling surface of the wheel body. The groove has an upper opening of 20mm, a lower opening of 13mm, and a depth of 1.5mm. It promotes the uniform expansion of metal material to the outer diameter, avoids the outer diameter depression or incomplete forming caused by traditional flat wheels, and significantly improves the outer diameter forming quality. It has the advantages of simple structure, low modification cost, and strong adaptability. It makes metal flow more controllable, eliminates surface wrinkles, cracks and other defects caused by material accumulation or missing material during the expansion process, and improves the surface smoothness of the product.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to an improved expanding hole rolling roller. Background Technology

[0002] In metal rolling and expanding processes, the expansion rolling roller is a key component used to apply radial pressure to a blank, causing the metal material to extend outward, rolling and expanding the outer diameter of the blank to ultimately achieve the target size.

[0003] Traditional expansion rolling rollers have a planar structure. When the blank is expanded and then rolled, the lack of a guiding structure on the rolling surface leads to incomplete expansion of the outer diameter of the product. This results in problems such as substandard outer diameter dimensions and surface quality defects after turning, which seriously affects production efficiency and product qualification rate.

[0004] Based on this, an improved expansion hole rolling roller is proposed for improvement. Utility Model Content

[0005] In view of the problem of insufficient rolling expansion caused by the existing flat rolling rollers, this utility model is proposed.

[0006] To solve the above technical problems, this utility model provides the following technical solution: an improved expansion hole rolling wheel, including a wheel body, wherein a trapezoidal groove is provided in the middle of the rolling surface of the wheel body, and isosceles surfaces are symmetrically arranged on the inner wall of the trapezoidal groove, and the cross section of the trapezoidal groove is an isosceles trapezoid.

[0007] As a preferred embodiment, the upper opening width of the trapezoidal groove is 20mm, the lower opening width of the trapezoidal groove is 13mm, and the depth of the trapezoidal groove is 1.5mm.

[0008] As a preferred embodiment, a positioning protrusion ring is formed outward on the surface of the wheel body, the distance from the rolling surface of the wheel body to the upper surface of the positioning protrusion ring is 15mm, and the outer surface diameter of the positioning protrusion ring is 600mm.

[0009] As a preferred embodiment, the positioning convex ring has an inclined surface on its side, and the inclination of the inclined surface is 2°.

[0010] As a preferred embodiment, the upper surface of the positioning convex ring is provided with a rounded corner at the connection between it and the inclined surface, and the radius of the rounded corner is 3mm.

[0011] As a preferred embodiment, the wheel body has a through hole with a diameter of 345 mm.

[0012] As a preferred embodiment, the wheel body is made of alloy ductile iron with a hardness of 40-42 HRC.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects: 1. This utility model effectively solves the problem of incomplete expansion caused by traditional flat rolling wheels by setting a trapezoidal groove in the middle of the rolling surface of the wheel body, with an upper opening of 20mm, a lower opening of 13mm, and a depth of 1.5mm. It promotes the uniform extension of metal material to the outer diameter, avoids the outer diameter depression or incomplete forming caused by traditional flat wheels, and significantly improves the outer diameter forming quality. It has the advantages of simple structure, low modification cost, and strong adaptability. It makes metal flow more controllable, eliminates surface wrinkles, cracks and other defects caused by material accumulation or missing material during the rolling process, and improves the surface smoothness of the product.

[0014] 2. This utility model combines high strength and wear resistance with the hardness of alloy ductile iron of 40-42HRC, making it suitable for withstanding alternating loads and metal friction during the rolling and expanding process. It can resist the scraping of the blank metal during rolling and expanding, extend the service life of the wheel body, and at the same time reduce stress concentration, preventing the wheel body from cracking or breaking during long-term high-frequency rolling and expanding operations. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 for Figure 1 Enlarged structural diagram at point A; Figure 3 for Figure 1 A magnified structural diagram at point B in the middle.

[0016] Explanation of reference numerals in the attached figures: 1. Wheel body; 2. Trapezoidal groove; 21. Isosceles surface; 3. Positioning convex ring; 31. Inclined surface; 32. Rounded corner; 4. Through hole. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] Reference Figures 1-3 This is the first embodiment of the present invention, which provides an improved expansion hole rolling wheel, including a wheel body 1. The rolling surface of the wheel body 1 is provided with a trapezoidal groove 2 in the middle. The inner wall of the trapezoidal groove 2 is symmetrically provided with isosceles surfaces 21. The cross section of the trapezoidal groove 2 is an isosceles trapezoid. The upper opening width of the trapezoidal groove 2 is 20mm, the lower opening width of the trapezoidal groove 2 is 13mm, and the depth of the trapezoidal groove 2 is 1.5mm.

[0019] During use, by setting a trapezoidal groove 2 in the middle of the rolling surface of the wheel body 1, with an upper opening of 20mm, a lower opening of 13mm, and a depth of 1.5mm, the problem of incomplete rolling expansion caused by traditional flat rolling wheels is effectively solved. This promotes the uniform extension of metal material to the outer diameter, avoids the outer diameter depression or incomplete forming caused by traditional flat rolling wheels, and significantly improves the outer diameter forming quality. It has the advantages of simple structure, low modification cost, and strong adaptability, making metal flow more controllable, eliminating defects such as surface wrinkles and cracks caused by material accumulation or missing material during the rolling expansion process, and improving the surface smoothness of the product.

[0020] Reference Figures 1-3 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that a positioning protrusion ring 3 is formed by protruding outward on the surface of the wheel body 1, the distance from the rolling surface of the wheel body 1 to the upper surface of the positioning protrusion ring 3 is 15mm, and the outer surface diameter of the positioning protrusion ring 3 is 600mm. The positioning protrusion ring 3 has an inclined surface 31 on its side, and the inclined surface 31 has an inclination of 2°. The upper surface of the positioning protrusion ring 3 is provided with a fillet 32 ​​at the connection between it and the inclined surface 31. The radius of the fillet 32 ​​is 3mm.

[0021] During use, the outer diameter of the positioning convex ring 3, 600mm, provides a reference for the radial positioning of the blank during the rolling process. The distance from the rolling surface of the wheel body 1 to the upper surface of the positioning convex ring 3 is 15mm, ensuring the installation accuracy of the blank in the axial direction. The two together form a rigid positioning surface, ensuring that the axis of the blank is aligned with the center of the wheel body 1 during rolling, avoiding the outer diameter forming deviation caused by offset, making the metal flow more stable during the rolling process, and ensuring the consistency of product dimensions. The positioning protrusion ring 3 has an inclined surface 31 with an inclination of 2° on its side, which facilitates the quick introduction of the blank into the positioning position and reduces installation resistance. The connection between the upper surface of the positioning protrusion ring 3 and the inclined surface 31 is transitioned with a rounded corner 32 with a radius of 3mm to avoid stress concentration and prevent scratches on the edge of the blank.

[0022] Reference Figures 1-3 This is the third embodiment of the present utility model. The difference between this embodiment and the second embodiment is that: a through hole 4 is provided inside the wheel body 1, and the diameter of the through hole 4 is 345mm. Wheel body 1 is made of alloy ductile iron with a hardness of 40-42 HRC.

[0023] During use, the through hole 4 is used to mount the main shaft of the rolling and expanding equipment. The wheel body 1 is fixed and rotated through key connection or interference fit. The alloy ductile iron with a hardness of 40-42HRC has both high strength and wear resistance, making it suitable for withstanding alternating loads and metal friction during the rolling and expanding process. It can resist the scraping of the blank metal during rolling and expanding, extend the service life of the wheel body 1, and reduce stress concentration, thus preventing the wheel body 1 from cracking or breaking during long-term high-frequency rolling and expanding operations.

[0024] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An improved expanding hole rolling wheel, comprising a wheel body (1), characterized in that: The roller (1) has a trapezoidal groove (2) in the middle of the rolling surface. The inner wall of the trapezoidal groove (2) is symmetrically provided with isosceles surfaces (21). The cross section of the trapezoidal groove (2) is an isosceles trapezoid.

2. The improved expansion hole rolling roller according to claim 1, characterized in that: The upper opening width of the trapezoidal groove (2) is 20mm, the lower opening width of the trapezoidal groove (2) is 13mm, and the depth of the trapezoidal groove (2) is 1.5mm.

3. The improved expansion hole rolling roller according to claim 1, characterized in that: The wheel body (1) has a positioning protrusion (3) protruding outward on its surface. The distance from the rolling surface of the wheel body (1) to the upper surface of the positioning protrusion (3) is 15mm. The outer diameter of the positioning protrusion (3) is 600mm.

4. An improved expanding hole rolling roller according to claim 3, characterized in that: The positioning protrusion (3) has an inclined surface (31) on its side, and the inclination of the inclined surface (31) is 2°.

5. An improved expanding hole compaction roller according to claim 4, characterized in that: The upper surface of the positioning protrusion (3) is provided with a rounded corner (32) at the connection between the inclined surface (31) and the positioning protrusion (3), and the radius of the rounded corner (32) is 3mm.

6. An improved expanding hole rolling roller according to claim 1, characterized in that: The wheel body (1) has a through hole (4) inside, and the diameter of the through hole (4) is 345mm.

7. An improved expanding hole rolling roller according to claim 1, characterized in that: The wheel body (1) is made of alloy ductile iron with a hardness of 40-42HRC.

Images