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

Abstract

A spinning tooling for manufacturing a spinning pulley with a large groove depth, multiple grooves and a large V shape, comprising a core mold fixture, a forming wheel and a pre-forming wheel. The height Ht of the forming teeth of the pre-forming wheel is 9 - 13 mm larger than the width Hg of the product groove opening, and the length Lt is 1 - 3 mm smaller than the groove depth Dg of the product; Dg is greater than 25 mm. 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. The five arcs include two arcs one R1, two arcs two R2 and an arc three R3; 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 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. The included angle θ between the upper hypotenuse and the lower hypotenuse is 1 - 5° larger than the included angle α between the upper and lower sides of the product groove type. The invention solves the problem that the large V-shaped spinning pulley with a groove depth greater than 25 mm is prone to breakage during use, effectively improves the strength of the pulley, and ensures its safety during use.

Description

Technical Field

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

[0002] At present, large-V type spinning pulleys are widely used in automobiles, agricultural machinery, and construction machinery. Relatively speaking, this type of structure has less material consumption, fewer processes, and a simple mold. The groove depth of the widely used large-V type spinning pulleys is generally less than 20 mm at present. With the development of technology, the market has put forward higher requirements for products. Currently, the required groove depth of large-V type spinning pulleys reaches more than 25 mm. Although the existing forming equipment and processes can be used to form products with a groove depth of up to 25 mm and there will be no breakage during the forming process, the formed products often break during use, and the safety in use 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 spinning tooling for manufacturing a large-groove-depth multi-groove large-V type spinning pulley, which effectively improves the strength of the large-V type spinning pulley and ensures its safety during use.

[0004] The technical solution of the present invention is as follows: A spinning tooling for manufacturing a large-groove-depth multi-groove large-V type spinning pulley includes a core mold fixture for pressing the product blank. The core mold fixture includes an upper core mold drivingly connected to the upper connection disk of the spinning equipment and a lower core mold drivingly connected to the lower connection disk of the spinning equipment; a mold core is installed inside the lower core mold; an ejector adapted to the shape of the product is installed at the upper end of the mold core; an inner core mold is installed between the lower core mold and the mold core; the inner core mold is composed of a plurality of split molds; the spinning wheel is installed on the spinning wheel fixing seat; the spinning wheel is arranged corresponding to the product blank clamped by the core mold fixture; the spinning wheel includes a forming wheel.

[0005] The spinning wheel further includes a pre-forming wheel.

[0006] There are N forming teeth on the pre-forming wheel; N is the number of grooves to be formed on the product.

[0007] The height Ht of the forming teeth is 9 - 13 mm larger than the width Hg of the product groove opening.

[0008] 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.

[0009] The cross-sectional shapes of the working surfaces of the forming teeth are the same.

[0010] 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.

[0011] The five arcs include two arcs R1 respectively connected to the upper hypotenuse and the lower hypotenuse, two arcs R2 respectively connected to the two arcs R1, and an arc R3 with two ends respectively connected to the two arcs R2; the arc R1 is tangent to the upper hypotenuse or the lower hypotenuse it is connected to; the radius of the circle where the arc R1 is located is smaller than the radius of the circle where the arc R2 is located; the radius of the circle where the arc R2 is located is smaller than the radius of the circle where the arc R3 is located.

[0012] The included angle θ between the upper hypotenuse and the lower hypotenuse is 1 to 5° larger than the included angle α between the upper and lower sides of the product groove.

[0013] The radius of the arc R1 is 8 - 12 mm; the radius of the arc R2 is 14 - 18 mm; the radius of the arc R3 is 20 - 24 mm.

[0014] The radius of the arc R1 is 9 - 11 mm; the radius of the arc R2 is 15 - 17 mm; the radius of the arc R3 is 21 - 23 mm.

[0015] The included angle θ between the upper hypotenuse and the lower hypotenuse is 1 to 3° larger than the included angle α between the upper and lower sides of the product groove.

[0016] The N is 2.

[0017] The inventive concept of the present invention lies in that during the spinning forming process of the large V-type spinning pulley, the material has 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 part. The thickness of the bottom of the groove must be 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 plastic deformation amount is small during the spinning forming process when the groove depth is shallow. The plastic deformation amount of the large V-type spinning pulley with a groove depth of 25 mm is much larger than that of the large V-type spinning pulley with a groove depth less than 20 mm. The 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 bottom part of the groove 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 bottom thickness needs to reach at least 70% of the original sheet material thickness after plastic deformation so as not to break during use.

[0018] The technical effect of the present invention is that 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. The newly designed preformed wheel ensures that the thickness of the bottom part of the groove of the spun product is greater than 70% of the sheet material thickness, improves the strength of the large groove-depth multi-groove large V-type spinning pulley, and ensures its safety during use. Description of the Drawings

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the preforming wheel.

[0021] Figure 3 It is a structural schematic diagram of the large V-type spinning pulley product.

[0022] In the figure, 1 is the lower connecting disk, 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 disk, 9 is the preforming wheel, 10 is the forming wheel, 11 is the spinning wheel fixing seat, and 12 is the product. Specific embodiments

[0023] Figure 1 In the specific embodiments, the lower connecting disk 1 of the spinning equipment is connected to the lower core mold 2 by screws, and a rabbet tight fit is adopted between the two. The forming block 3 is installed in the lower core mold 2, and a sliding fit is adopted between the two. The mold core 5 is installed in the forming block 3, and a rabbet sliding fit is adopted between the two. The inner core mold 4 is installed between the forming block 3 and the mold core 5, and a sliding fit is adopted between the inner core mold 4, the forming block 3 and the mold core 5. A tight fit is adopted between the lower core mold 2 and the mold core 5; while ensuring that the inner core mold 4 will not fall apart when placed, the accuracy and rigidity of the support of the inner core mold 4 are increased. The ejector 6 is installed in the mold core 5, and a rabbet sliding fit is adopted between the two. Driven by the lower connecting disk 1 of the spinning equipment, the lower core mold 2, the forming block 3, the inner core mold 4, the mold core 5, and the ejector 6 can be driven to rotate. The upper connecting disk 8 of the spinning equipment is connected to the upper core mold 7 by screws, and a rabbet tight fit is adopted between the two. The upper connecting disk 8 can drive the upper core mold 7 to move up and down reciprocally, and at the same time, it can rotate synchronously with the lower connecting disk 1. The preforming wheel 9 is fixed on the spinning wheel fixing seat 11 of the spinning equipment, and can move left and right reciprocally under the drive of the spinning equipment. There is a bearing between the preforming wheel 9 and the spinning wheel fixing seat 11. The preforming wheel 9 can rotate in the opposite direction to the product 12 during the process of extruding the product 12. The forming wheel 10 is fixed on the spinning wheel fixing seat 11 of the spinning equipment, and can move left and right reciprocally under the drive of the spinning equipment. There is a bearing between the forming wheel 10 and the spinning wheel fixing seat 11. The forming wheel 10 can rotate in the opposite direction to the product 12 during the process of extruding the product 12.

[0024] There are 2 forming teeth on the preforming wheel 9. 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 inclined edge 901, a lower inclined edge 902, and five arcs connecting the upper inclined edge 901 and the lower inclined edge 902. The circles where two adjacent arcs are located are tangent to each other. The arcs gradually increase from a part of the upper inclined edge on one side to the central part and then gradually decrease to a part of the lower inclined edge on the other side, and the two sides are symmetric structures. The five arcs include two arcs 1 - R1 respectively connected to the upper inclined edge and the lower inclined edge, two arcs 2 - R2 respectively connected to the two arcs 1 - R1, and an arc 3 - R3 with both ends respectively connected to the two arcs 2 - R2. The arc 1 - R1 is tangent to the upper inclined edge or the lower inclined edge connected to it. The radius of the circle where the arc 1 is located is smaller than the radius of the circle where the arc 2 is located. The radius of the circle where the arc 2 is located is smaller than the radius of the circle where the arc 3 is located.

[0025] During operation, first place the blank of the 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 connection disk 8. After the upper core mold 7 fits with the product 12, the upper connection disk 8 and the lower connection disk 1 start to rotate synchronously and drive the product 12 to rotate. The preforming wheel 9 moves under the drive of the wheel fixing seat 11, approaches until it contacts the product 12, the preforming wheel 9 rotates in the opposite direction relative to the product 12 and continuously feeds to extrude the product 12. At the same time, the upper core mold 7 descends to press the product 12, the inner cavity of the product 12 is supported by the inner core mold 4, the product 12 generates bending and folding. When the straight edge height of the product is pressed to two-thirds of the blank height, the preforming wheel 9 retracts. The forming wheel 10 moves under the drive of the wheel fixing seat 11, approaches until it contacts the product 12, the forming wheel 10 rotates in the opposite direction relative to the product 12 and continuously feeds to extrude the product 12. At the same time, the upper core mold 7 continues to descend to press the product 12, the inner cavity of the product 12 is supported by the inner core mold 4, and the product 12 continues to generate bending and folding until the 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. The spinning process is completed, the upper core mold 7 and the forming wheel 10 retract, the product 12 can be taken out from the forming block 3, and then the mold core 5, the inner core mold 4, and the ejector 6 in the inner cavity of the product 12 are taken out.

[0026] Figure 2 、 Figure 3In this case, the preformed wheel 9 provided by the present invention has 2 forming teeth. The height Ht of the forming teeth is 11.5 mm larger than the width Hg of the product notch. The length Lt of the forming teeth is 1.2 mm smaller than the depth Dg of the product groove. 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 two adjacent arcs are located are tangent to each other. 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 shape. 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.

Claims

1. A spinning tooling for manufacturing a spinning pulley with a large groove depth, multiple grooves and a large V shape, characterized in that: It includes a core die fixture for pressing the product blank. The core die fixture includes an upper core die (7) drivingly connected to the upper coupling disk on the spinning equipment and a lower core die (2) drivingly connected to the lower coupling disk on the spinning equipment; a die core (5) is installed inside the lower core die (2); a ejector (6) adapted to the product shape is installed at the upper end of the die core (5); an inner core die (4) is installed between the lower core die (2) and the die core (5); the inner core die (4) is composed of a plurality of split dies; the spinning wheel is installed on the spinning wheel fixing seat (11); the spinning wheel is arranged corresponding to the product blank clamped by the core die fixture; the spinning wheel includes a forming wheel (10). The spinning wheel further includes a preforming wheel (9). There are N forming teeth on the preforming wheel (9); N is the number of forming grooves required for the product. The height Ht of the forming tooth is 9 - 13 mm larger than the width Hg of the product groove opening. The length Lt of the forming tooth is 1 - 3 mm smaller 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 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 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 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. The included angle θ between the upper hypotenuse (901) and the lower hypotenuse (902) is 1 - 5° larger than the included angle α between the upper side (1201) and the lower side (1202) of the product groove shape.

2. The spinning tooling for manufacturing a spinning pulley with a large groove depth and multiple large V-shaped grooves according to claim 1, characterized in that: 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 tooling for manufacturing a spinning pulley with a large groove depth, multiple grooves and a large V shape 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 tooling for manufacturing a spinning pulley with a large groove depth, multiple grooves and a large V shape according to claim 1, characterized in that: The included angle θ between the upper hypotenuse (901) and the lower hypotenuse (902) is 1 - 3° larger than the included angle α between the upper side (1201) and the lower side (1202) of the product groove shape.

5. The spinning tooling for manufacturing a spinning pulley with a large groove depth, multiple grooves and a large V shape according to claim 1, wherein: The N is 2.

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