A roller for manufacturing a spinning pulley with a large groove depth, multiple grooves and a large V shape

Abstract

A roller for manufacturing a spinning pulley with a large groove depth and multiple large V-shaped grooves, wherein the height Ht of the forming tooth is 9 - 13 mm greater than the width Hg of the product groove opening. The length Lt of the forming tooth is 1 - 3 mm smaller than the groove depth Dg of the product; the groove depth Dg of the product is greater than 25 mm. The cross-sectional shape of the working surface of the forming tooth is composed of an upper hypotenuse, a lower hypotenuse, and five arcs connecting the upper hypotenuse and the lower hypotenuse; the circles where two adjacent arcs are located are tangent to each other. The five arcs include two arcs one R1, two arcs two R2, and arc three R3; arc one R1 is tangent to the upper hypotenuse or the lower hypotenuse connected to it; the radius of the circle where arc one R1 is located is smaller than the radius of the circle where arc two R2 is located; the radius of the circle where arc two R2 is located is smaller than the radius of the circle where arc three R3 is located. The included angle θ between the upper hypotenuse and the lower hypotenuse is 1 - 5° greater than the included angle α between the upper and lower sides of the product groove type. The present invention solves the problem of easy fracture during the use of a large V-shaped spinning pulley with a groove depth greater than 25 mm, improves the strength of the spinning pulley with a large groove depth and multiple large V-shaped grooves, and ensures its safety during use.

Description

Technical Field

[0001] The present invention belongs to the technical field of processing of plate - made spun pulley, and particularly relates to a roller for manufacturing a large - groove - depth multi - groove large - V type spun pulley. Background Art

[0002] At present, large - V type spun pulleys are widely used in automobiles, agricultural machinery, and construction machinery. Relatively speaking, this kind of structure consumes less material, has fewer processes, and simple molds. The groove depth of the widely used large - V type spun pulleys is generally less than 20 mm at present. With the development of technology, the market has put forward higher requirements. Currently, the required groove depth of the large - V type spun pulley reaches more than 25 mm. Although the existing forming equipment and processes can be used to form products with a groove depth of 25 mm, there will be no fracture during the forming process, but the formed products often break during use, and the use safety is poor. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above - mentioned deficiencies of the prior art and provide a roller for manufacturing a large - groove - depth multi - groove large - V type spun pulley, which can effectively improve the strength of the large - V type spun pulley and ensure its safety during use.

[0004] The technical solution of the present invention is as follows: A roller for manufacturing a large - groove - depth multi - groove large - V type spun pulley, where there are N forming teeth on the roller; N is the number of grooves to be formed in the product.

[0005] The height Ht of the forming teeth is 9 - 13 mm larger than the width Hg of the product groove opening.

[0006] The length Lt of the forming teeth is 1 - 3 mm smaller than the groove depth Dg of the product; the groove depth Dg of the product is greater than 25 mm.

[0007] The cross - sectional shapes of the working surfaces of the forming teeth are the same.

[0008] The cross - sectional shape of the working surface of the forming teeth is composed of an upper hypotenuse, a lower hypotenuse, and five arcs connecting the upper hypotenuse and the lower hypotenuse; the circles where two adjacent arcs are located are tangent to each other.

[0009] The five arcs include two arcs one R1 respectively connected to the upper hypotenuse and the lower hypotenuse, two arcs two R2 respectively connected to the two arcs one R1, and an arc three R3 with two ends respectively connected to the two arcs two R2; the arc one R1 is tangent to the upper hypotenuse or the lower hypotenuse it is connected to; the radius of the circle where the arc one R1 is located is smaller than the radius of the circle where the arc two R2 is located; the radius of the circle where the arc two R2 is located is smaller than the radius of the circle where the arc three R3 is located..

[0010] The included angle θ between the upper hypotenuse and the lower hypotenuse is 1 - 5° larger than the included angle α between the upper side and the lower side of the product groove type.

[0011] The radius of the first arc R1 is 8 - 12 mm; the radius of the second arc R2 is 14 - 18 mm; the radius of the third arc R3 is 20 - 24 mm.

[0012] The radius of the first arc R1 is 9 - 11 mm; the radius of the second arc R2 is 15 - 17 mm; the radius of the third arc R3 is 21 - 23 mm.

[0013] The included angle θ between the upper hypotenuse and the lower hypotenuse is 1 - 3° larger than the included angle α between the upper and lower sides of the product groove.

[0014] The value of N is 2.

[0015] The inventive concept of the present invention lies in that during the spinning forming process of the large V - type spinning pulley, the material undergoes bending deformation and plastic deformation. The bottom part of the groove of the large V - type spinning pulley is the part that bears the greatest force during the forming process, and its plastic deformation is also the largest. The thickness of the groove bottom is necessarily less than the thickness of the sheet material. The inventor of the present invention has found that the groove depth of the widely used large V - type spinning pulley is generally less than 20 mm. The amount of plastic deformation during the spinning forming process is small when the groove depth is shallow. For a large V - type spinning pulley with a groove depth of 25 mm, the amount of plastic deformation is much larger than that of a large V - type spinning pulley with a groove depth less than 20 mm. The groove bottom thickness of the large - groove - depth multi - groove large V - type spinning pulley manufactured by the current related technology is only 50% of the sheet material thickness. The insufficient thickness of the groove bottom part is the fundamental reason for the fracture of the large - groove - depth multi - groove large V - type spinning pulley. From the analysis of fatigue durability verification and long - term use, the groove bottom thickness needs to reach at least 70% of the original sheet material thickness after plastic deformation so as not to break during use.

[0016] The technical effect of the present invention is as follows: The present invention solves the problem that the large V - type spinning pulley with a groove depth greater than 25 mm is prone to fracture during use. Through the newly designed pre - forming spinning wheel, it is ensured that the thickness of the groove bottom part of the spun product is greater than 70% of the sheet material thickness, improving the strength of the large - groove - depth multi - groove large V - type spinning pulley and ensuring its safety during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the structural schematic diagram of the present invention.

[0018] Figure 2 is the structural schematic diagram of the large V - type spinning pulley product.

[0019] Figure 3 is the schematic diagram of the use state of the present invention.

[0020] In the figure, 1 is the lower connecting plate, 2 is the lower core mold, 3 is the forming block, 4 is the inner core mold, 5 is the mold core, 6 is the ejector, 7 is the upper core mold, 8 is the upper connecting plate, 9 is the spinning wheel, 10 is the forming wheel, 11 is the spinning wheel fixing seat, and 12 is the product. Specific embodiments

[0021] Figure 1 , Figure 2 In [reference], the spinning wheel 9 (pre-forming wheel) provided by the present invention for manufacturing a large groove depth and multi-groove large V-type spinning pulley has 2 forming teeth. The height Ht of the forming teeth is 11.5 mm larger than the width Hg of the product groove opening. The length Lt of the forming teeth is 1.2 mm smaller than the groove depth Dg of the product. The cross-sectional shapes of the working surfaces of each forming tooth are the same. The cross-sectional shape of the working surface of the forming tooth is composed of an upper hypotenuse 901, a lower hypotenuse 902, and five arcs connecting the upper hypotenuse 901 and the lower hypotenuse 902. The circles where adjacent two arcs are located are tangent to each other. The arcs gradually become larger from one side of the upper hypotenuse part to the central part and then gradually become smaller to the other side of the lower hypotenuse part, and both sides are symmetric structures. The five arcs include two arcs one R1 respectively connected to the upper hypotenuse and the lower hypotenuse, two arcs two R2 respectively connected to the two arcs one R1, and an arc three R3 with both ends respectively connected to the two arcs two R2. The arc one R1 is tangent to the upper hypotenuse or the lower hypotenuse connected to it. The radius of the circle where the arc one is located is smaller than the radius of the circle where the arc two is located. The radius of the circle where the arc two is located is smaller than the radius of the circle where the arc three is located. The radius of the arc one R1 is 9 mm. The radius of the arc two R2 is 17 mm. The radius of the arc three R3 is 21 mm. The included angle θ between the upper hypotenuse and the lower hypotenuse is 1.5° larger than the included angle α between the upper side 1201 and the lower side 1202 of the product groove type.

[0022] Figure 3In the present invention, when in use, first place the blank of product 12 into the card slot between the lower core mold 2 and the forming block 3. The upper core mold 7 descends under the drive of the upper coupling disk 8. After the upper core mold 7 fits with product 12, the upper coupling disk 8 and the lower coupling disk 1 start to rotate synchronously and drive product 12 to rotate. The spinning wheel 9 moves under the drive of the spinning wheel fixing seat 11, approaches until it contacts product 12, the spinning wheel 9 rotates in the opposite direction relative to product 12 and continuously feeds to extrude product 12. At the same time, the upper core mold 7 descends to press product 12, the inner cavity of product 12 is supported by the inner core mold 4, and product 12 generates bending and folding. When the straight edge height of the product is pressed to two-thirds of the blank height, the spinning wheel 9 retracts. The forming wheel 10 moves under the drive of the spinning wheel fixing seat 11, approaches until it contacts product 12, the forming wheel 10 rotates in the opposite direction relative to product 12 and continuously feeds to extrude product 12. At the same time, the upper core mold 7 continues to descend to press product 12, the inner cavity of product 12 is supported by the inner core mold 4, and product 12 continues to generate bending and folding until product 12 is completely in contact with the forming block 3, the upper core mold 7, the forming wheel 10, and the inner core mold 4. After the spinning process is completed, the upper core mold 7 and the forming wheel 10 retract, product 12 can be taken out from the forming block 3, and then the core mold 5, the inner core mold 4, and the ejector 6 in the inner cavity of product 12 are taken out.

Claims

1. A spinning wheel for manufacturing a spinning pulley with a large groove depth, multiple grooves and a large V shape, characterized in that: There are N forming teeth on the spinning wheel (9); N is the number of forming grooves required for the product; The height Ht of the forming teeth is 9 - 13 mm greater than the width Hg of the product groove opening; The length Lt of the forming teeth is 1 - 3 mm less than the depth Dg of the product groove; the depth Dg of the product groove is greater than 25 mm; The cross-sectional shapes of the working surfaces of the forming teeth are the same; The cross-sectional shape of the working surface of the forming teeth is composed of an upper hypotenuse (901), a lower hypotenuse (902), and five arcs connecting the upper hypotenuse (901) and the lower hypotenuse (902); the circles where two adjacent arcs are located are tangent to each other; The five arcs include two arcs one R1 respectively connected to the upper hypotenuse (901) and the lower hypotenuse (902), two arcs two R2 respectively connected to the two arcs one R1, and an arc three R3 with both ends respectively connected to the two arcs two R2; the arc one R1 is tangent to the upper or lower hypotenuse it is connected to; the radius of the circle where the arc one R1 is located is less than the radius of the circle where the arc two R2 is located; the radius of the circle where the arc two R2 is located is less than the radius of the circle where the arc three R3 is located; The included angle θ between the upper hypotenuse (901) and the lower hypotenuse (902) is 1 - 5° greater than the included angle α between the upper edge (1201) and the lower edge (1202) of the product groove type; 2. The spinning wheel for manufacturing a large groove-depth multi-groove large-V type spinning pulley according to claim 1, wherein: The radius of the arc one R1 is 8 - 12 mm; The radius of the arc two R2 is 14 - 18 mm; The radius of the arc three R3 is 20 - 24 mm.

3. The spinning wheel for manufacturing a multi-groove large V-type spinning pulley with a large groove depth according to claim 2, characterized in that: The radius of the arc one R1 is 9 - 11 mm; The radius of the arc two R2 is 15 - 17 mm; The radius of the arc three R3 is 21 - 23 mm.

4. The spinning wheel for manufacturing a large groove depth and multi-groove large V-type spinning pulley according to claim 1, characterized in that: The included angle θ between the upper hypotenuse (901) and the lower hypotenuse (902) is 1 - 3° greater than the included angle α between the upper edge (1201) and the lower edge (1202) of the product groove type; 5. The spinning wheel for manufacturing a large groove depth multi-groove large V type spinning pulley according to claim 1, characterized in that: N is 2.

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