Large-v type spinning process for large-groove deep-groove belt pulley

Abstract

A kind of large groove deep multi-groove large V type spinning pulley spinning process, comprising the following steps: preforming wheel is installed in spinning wheel fixed seat, the blank of product is placed between lower core mould and forming block, and upper and lower coupling disc drives product blank to rotate;Preforming wheel is reversely rotated relative to blank and continuously feeds extrusion product blank, and when product straight edge height is two-thirds of blank straight edge original height, preforming wheel is withdrawn under the driving of spinning wheel fixed seat;Forming wheel is moved under the driving of spinning wheel fixed seat, reversely rotates relative to product and continuously feeds extrusion product, until product and forming block, upper core mould, forming wheel and inner core mould are completely die, forming wheel is withdrawn under the driving of spinning wheel fixed seat, and spinning is completed.The present application makes the thickness of groove bottom part of spun product greater than 70% of plate thickness, solves the problem that large V type spinning pulley with groove depth greater than 25mm is easy to break in use, effectively improves the strength of pulley and ensures its safety in use.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plate spinning pulley processing, and particularly relates to a large-groove-deep multi-groove large-V type spinning pulley spinning process. BACKGROUND

[0002] At present, the large-V type spinning pulley is widely applied in automobiles, agricultural machinery and engineering machinery, and the material consumption, process and die of the structure are relatively less. The groove depth of the widely used large-V type spinning pulley is generally less than 20 mm. With the development of technology, the market puts forward higher requirements for products. At present, the groove depth of the required large-V type spinning pulley reaches more than 25 mm. Although the existing forming equipment and process can be used to form the product with a groove depth of 25 mm, the product does not break in the forming process, but the product often breaks in the use process, and the safety is poor. SUMMARY

[0003] The application aims to overcome the above-mentioned deficiencies in the prior art and provide a large-groove-deep multi-groove large-V type spinning pulley spinning process, which effectively improves the strength of the large-V type spinning pulley and ensures the safety in the use process.

[0004] The technical scheme of the application is as follows: a large-groove-deep multi-groove large-V type spinning pulley spinning process, comprising a spinning tool.

[0005] The spinning tool comprises a core mold clamp for pressing the product blank, and the core mold clamp comprises an upper core mold connected with a coupling disc on a spinning device in transmission and a lower core mold connected with a lower coupling disc on the spinning device in transmission. A mold core is arranged in the lower core mold. A ejector matched with the shape of the product is arranged on the upper end of the mold core. An inner core mold is arranged between the lower core mold and the mold core. The inner core mold is composed of multiple split mold parts. A spinning wheel is arranged on a spinning wheel fixed seat through a spinning wheel shaft. The spinning wheel is arranged corresponding to the product blank clamped by the core mold clamp. The spinning wheel comprises a forming wheel.

[0006] The spinning wheel further comprises a pre-forming wheel.

[0007] The pre-forming wheel has N forming teeth. N is the number of grooves required to be formed on the product.

[0008] The height Ht of the forming teeth is 9-13 mm larger than the groove width Hg of the product.

[0009] 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.

[0010] The cross-sectional shape of the working surface of each forming tooth is the same.

[0011] The cross-sectional shape of the profiled tooth working surface is composed of an upper bevel, a lower bevel, and five circular arcs connecting the upper bevel and the lower bevel; the two adjacent circular arcs are tangent to each other.

[0012] The five circular arcs include two circular arcs one R1 connected with the upper bevel and the lower bevel respectively, two circular arcs two R2 connected with the two circular arcs one R1 respectively, and a circular arc three R3 connected with the two circular arcs two R2 respectively; the circular arc one R1 is tangent to the upper bevel or the lower bevel connected therewith; the radius of the circular arc one R1 is smaller than the radius of the circular arc two R2; the radius of the circular arc two R2 is smaller than the radius of the circular arc three R3.

[0013] The included angle θ between the upper bevel and the lower bevel is 1-5° larger than the included angle α between the upper edge and the lower edge of the product groove.

[0014] The spinning process of the large-groove deep-groove large-V-shaped spinning pulley includes the following steps:

[0015] 1) The preforming wheel is installed on the spinning wheel fixing seat, the product blank is placed between the lower core mold and the forming block, the upper core mold is driven to move downward by the spinning equipment, after the upper core mold is in contact with the product blank, the upper connecting disc and the lower connecting disc are started to rotate synchronously to drive the product blank to rotate;

[0016] 2) The preforming wheel is driven to move by the spinning wheel fixing seat, and is close to and contacts the blank, the preforming wheel is reversely rotated relative to the blank and continuously feeds to extrude the product blank, at the same time, the upper core mold moves downward to press the blank, the inner cavity of the blank is supported by the inner core mold, the blank is bent and folded, and when the straight edge height of the product is two-thirds of the original height of the straight edge of the blank, the preforming wheel is driven to move out by the spinning wheel fixing seat;

[0017] 3) The forming wheel is installed on the spinning wheel fixing seat, the forming wheel is driven to move by the spinning wheel fixing seat, and is close to and contacts the product, the forming wheel is reversely rotated relative to the product and continuously feeds to extrude the product, at the same time, the upper core mold continues to move downward to press the product, the inner cavity of the product is supported by the inner core mold, the product continues to be bent and folded, until the product is completely in contact with the forming block, the upper core mold, the forming wheel, and the inner core mold, the forming wheel is driven to move out by the spinning wheel fixing seat, the upper core mold moves upward to retreat, and the spinning is completed;

[0018] 4) The product is taken out from the forming block, and then the mold core in the inner cavity of the product, the inner core mold, and the ejector are taken out.

[0019] The radius of the circular arc one R1 is 8-12 mm, the radius of the circular arc two R2 is 14-18 mm, and the radius of the circular arc three R3 is 20-24 mm.

[0020] The radius of the first arc R1 is 9-11mm; the radius of the second arc R2 is 15-17mm; and the radius of the third arc R3 is 21-23mm.

[0021] The included angle theta between the upper inclined edge and the lower inclined edge is 1-3 degrees larger than the included angle alpha between the upper edge and the lower edge of the product groove.

[0022] The N is 2.

[0023] The inventive concept of the present application is that, in the spinning forming process, the material of the large-V spinning pulley has bending deformation and plastic deformation, the groove bottom part of the large-V spinning pulley is the part with the largest stress in the forming process, and the plastic deformation of the groove bottom part is also the largest, so the thickness of the groove bottom must be smaller than the thickness of the plate. The present inventor has found that the groove depth of the widely used large-V spinning pulley is generally less than 20mm, the plastic deformation amount is small in the spinning forming process, the plastic deformation amount of the large-V spinning pulley with a groove depth of 25mm is much larger than that of the large-V spinning pulley with a groove depth less than 20mm. The thickness of the groove bottom of the large-groove multi-groove large-V spinning pulley manufactured by the related art is only 50% of the thickness of the plate, and the insufficient thickness of the groove bottom part is the root cause of the fracture of the large-groove multi-groove large-V spinning pulley. According to the fatigue durability verification and long-term use, the thickness of the groove bottom after plastic deformation needs to be at least 70% of the thickness of the original plate, so that the fracture does not occur in the use process.

[0024] The technical effect of the present application is that the present application solves the problem of easy fracture of the large-V spinning pulley with a groove depth greater than 25mm in the use process, the spinning process combined with the newly designed pre-forming wheel ensures that the thickness of the groove bottom part of the product after spinning is greater than 70% of the thickness of the plate, and the strength of the large-groove multi-groove large-V spinning pulley is improved, thereby ensuring the safety in the use process. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structure schematic view of the spinning tooling used in the present application.

[0026] Figure 2 is a structure schematic view of the pre-forming wheel.

[0027] Figure 3 is a structure schematic view of the large-V spinning pulley product.

[0028] In the figure, 1 is a lower coupling disc, 2 is a lower core die, 3 is a forming block, 4 is an inner core die, 5 is a die core, 6 is an ejector, 7 is an upper core die, 8 is an upper coupling disc, 9 is a pre-forming wheel, 10 is a forming wheel, 11 is a spinning wheel fixing seat, and 12 is a product. DETAILED DESCRIPTION

[0029] Figure 1The large-slot deep-slot large-V spinning process of the present application is characterized in that it comprises a spinning tool. The spinning tool comprises a core mold clamp for pressing the product blank, the core mold clamp comprising an upper core mold 7 connected with the upper coupling disc of the spinning equipment and a lower core mold 2 connected with the lower coupling disc of the spinning equipment. The lower core mold 2 is internally provided with a mold core 5. The upper end of the mold core 5 is provided with an ejector 6 matched with the shape of the product. An inner core mold 4 is arranged between the lower core mold 2 and the mold core 5. The inner core mold 4 is composed of multiple split mold parts. A spinning wheel is arranged on a spinning wheel fixed seat 11 through a spinning wheel shaft. The spinning wheel is arranged corresponding to the product blank clamped by the core mold clamp. The spinning wheel comprises a forming wheel 10 and a pre-forming wheel 9.

[0030] The lower coupling disc 1 of the spinning equipment is connected with the lower core mold 2 through screws, and the two are tightly matched through a stop opening. The lower core mold 2 is internally provided with a forming block 3, and the two are slidably matched. The forming block 3 is internally provided with the mold core 5, and the two are slidably matched through a stop opening. The inner core mold 4 is arranged between the forming block 3 and the mold core 5, and the inner core mold 4 is slidably matched with the forming block 3 and the mold core 5. The lower core mold 2 and the mold core 5 are tightly matched; the inner core mold 4 is placed without being scattered, and the accuracy and rigidity of the support of the inner core mold 4 are increased. The mold core 5 is internally provided with the ejector 6, and the two are slidably matched through a stop opening. Under the driving of the lower coupling disc 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 rotated. The upper coupling disc 8 of the spinning equipment is connected with the upper core mold 7 through screws, and the two are tightly matched through a stop opening. The upper coupling disc 8 can drive the upper core mold 7 to realize up-and-down reciprocating motion, and can realize synchronous rotation with the lower coupling disc 1. The pre-forming wheel 9 is fixed on the spinning wheel fixed seat 11 of the spinning equipment, and can realize left-and-right reciprocating motion under the driving of the spinning equipment. There is a bearing between the pre-forming wheel 9 and the spinning wheel fixed seat 11, and the pre-forming wheel 9 can realize reverse rotation with the product 12 in the process of extruding the product 12. The forming wheel 10 is fixed on the spinning wheel fixed seat 11 of the spinning equipment, and can realize left-and-right reciprocating motion under the driving of the spinning equipment. There is a bearing between the forming wheel 10 and the spinning wheel fixed seat 11, and the forming wheel 10 can realize reverse rotation with the product 12 in the process of extruding the product 12.

[0031] The preforming wheel 9 has two forming teeth. The cross-sectional shape of the working surface of each forming tooth is the same. The cross-sectional shape of the working surface of the forming tooth is composed of an upper bevel 901, a lower bevel 902, and five circular arcs connecting the upper bevel 901 and the lower bevel 902. The circles of the two adjacent circular arcs are tangent to each other. The circular arc gradually increases from the upper bevel on one side to the center and then gradually decreases to the lower bevel on the other side, and the two sides are symmetrical structures. The five circular arcs include two circular arcs R1 connected to the upper bevel and the lower bevel respectively, two circular arcs R2 connected to the two circular arcs R1 respectively, and a circular arc R3 connected to the two circular arcs R2 at both ends. The circular arc R1 is tangent to the upper bevel or the lower bevel connected thereto. The radius of the circle where the circular arc R1 is located is smaller than the radius of the circle where the circular arc R2 is located. The radius of the circle where the circular arc R2 is located is smaller than the radius of the circle where the circular arc R3 is located.

[0032] The large-groove deep-groove large-V spinning process for the belt wheel provided by the present application comprises the following steps:

[0033] 1) The preforming wheel 9 is installed on the spinning wheel fixing seat, the product blank is placed between the lower core mold 2 and the forming block 3, the upper core mold 7 is driven to move downward by the spinning equipment, and after the upper core mold 7 is in close contact with the product blank, the upper coupling disc and the lower coupling disc are started to rotate synchronously to drive the product blank to rotate.

[0034] 2) The preforming wheel 9 is moved by the spinning wheel fixing seat 11, approaches until contacting the blank, the preforming wheel 9 rotates reversely relative to the blank and continuously feeds to extrude the product blank, at the same time, the upper core mold 7 moves downward to press the blank, the inner cavity of the blank is supported by the inner core mold 4, the blank is bent and folded, and when the product 12 is pressed to a height of two-thirds of the original height of the straight edge of the blank (i.e., when the upper core mold moves downward by a distance of one-third of the original height of the straight edge of the blank), the preforming wheel 9 is withdrawn by the spinning wheel fixing seat 11.

[0035] 3) The forming wheel 10 is installed on the spinning wheel fixing seat, the forming wheel 10 is moved by the spinning wheel fixing seat 11, approaches until contacting the product 12, the forming wheel 10 rotates reversely relative to the product 12 and continuously feeds to extrude the product 12, at the same time, the upper core mold 7 continues to move downward to press the product 12, the inner cavity of the product 12 is supported by the inner core mold 4, the product 12 continues to be bent and folded, until the product 12 and the forming block 3, the upper core mold 7, the forming wheel 10, and the inner core mold 4 are completely in close contact, and the forming wheel 10 is withdrawn by the spinning wheel fixing seat 11, the upper core mold 7 moves upward to retreat, and the spinning is completed.

[0036] 4) The product 12 is taken out of the forming block 3, and then the mold core 5 in the inner cavity of the product 12, the inner core mold 4, and the ejector 6 are taken out.

[0037] Figure 2 、 Figure 3In the present application, the preformed wheel 9 has two forming teeth. The forming tooth height Ht is 11.5 mm larger than the product slot width Hg. The forming tooth length Lt is 1.2 mm smaller than the product slot depth Dg. The cross-sectional shape of the working surface of each forming tooth is the same. The cross-sectional shape of the working surface of the forming tooth is composed of an upper bevel 901, a lower bevel 902, and five circular arcs connecting the upper bevel 901 and the lower bevel 902. The circles of the two adjacent circular arcs are tangent to each other. The included angle θ of the upper bevel and the lower bevel is 1.5° larger than the included angle α of the upper edge 1201 and the lower edge 1202 of the product slot. The five circular arcs include two circular arcs one R1 connected to the upper bevel and the lower bevel respectively, two circular arcs two R2 connected to the two circular arcs one R1 respectively, and a circular arc three R3 connected to the two circular arcs two R2 respectively. The circular arc one R1 is tangent to the upper bevel or the lower bevel connected thereto. The radius of the circle of the circular arc one R1 is smaller than the radius of the circle of the circular arc two R2. The radius of the circle of the circular arc two R2 is smaller than the radius of the circle of the circular arc three R3. The radius of the circular arc one R1 is 9 mm. The radius of the circular arc two R2 is 17 mm. The radius of the circular arc three R3 is 21 mm.

Claims

1. A spinning process for a deep, multi-groove, large V-shaped spinning pulley, characterized in that: Includes a spinning tool; The spinning fixture includes a core mold clamp for clamping the product blank. The core mold clamp includes an upper core mold (7) that is driven to the connecting plate of the spinning equipment and a lower core mold (2) that is driven to the lower connecting plate of the spinning equipment. The lower core mold (2) contains a forming block (3), and the forming block (3) contains a mold core (5). The upper end of the mold core (5) is equipped with an ejector (6) adapted to the shape of the product. An inner core mold (4) is installed between the forming block (3) and the mold core (5). The inner core mold (4) is composed of multiple segmented molds. The spinning wheel is mounted on the spinning wheel fixing seat (11) via the spinning wheel shaft. The spinning wheel and the product blank clamped by the core mold clamp are correspondingly arranged. The spinning wheel includes a forming wheel (10). The swivel also includes a pre-formed wheel (9); The preforming wheel (9) has N forming teeth; N is the number of forming grooves required for the product; The height Ht of the forming tooth is 9-13 mm greater than the width Hg of the product groove; The length Lt of the forming tooth is 1-3 mm smaller than the product groove depth Dg; the product groove depth Dg is greater than 25 mm; The working surface cross-sectional shape of each formed tooth is the same; The cross-sectional shape of the working surface of the forming tooth is composed of an upper inclined side (901), a lower inclined side (902), and five circular arcs connecting the upper inclined side (901) and the lower inclined side (902); the circles containing two adjacent circular arcs are tangent. The five arc segments include two arc segments R1 connected to the upper inclined side (901) and the lower inclined side (902) respectively, two arc segments R2 connected to the two arc segments R1 respectively, and an arc segment R3 connected to the two arc segments R2 at both ends respectively; the arc segment R1 is tangent to the upper or lower inclined side it is connected to; the radius of the circle containing the arc segment R1 is smaller than the radius of the circle containing the arc segment R2; the radius of the circle containing the arc segment R2 is smaller than the radius of the circle containing the arc segment R3; The angle θ between the upper inclined side (901) and the lower inclined side (902) is 1~5° larger than the angle α between the upper side (1201) and the lower side (1202) of the product groove. The spinning process for large-groove, multi-groove, large V-shaped spinning pulleys includes the following steps: 1) The pre-forming wheel (9) is installed on the spinning wheel fixing seat, and the product blank is placed between the lower core mold (2) and the forming block (3). The upper core mold (7) moves down under the drive of the spinning equipment. After the upper core mold (7) is in contact with the product blank, the upper connecting plate and the lower connecting plate start to rotate synchronously, driving the product blank to rotate. 2) The preforming wheel (9) moves under the drive of the rotating wheel fixing seat (11) and approaches until it contacts the blank. The preforming wheel (9) rotates in the opposite direction to the blank and continues to feed and extrude the product blank. At the same time, the upper core mold (7) moves down to press the blank. The inner cavity of the blank is supported by the inner core mold (4). The blank bends and folds. When the height of the straight edge of the product (12) is two-thirds of the original height of the straight edge of the blank, the preforming wheel (9) is withdrawn under the drive of the rotating wheel fixing seat (11). 3) The forming wheel (10) is mounted on the rotating wheel fixing seat. The forming wheel (10) moves under the drive of the rotating wheel fixing seat (11) and approaches until it contacts the product (12). The forming wheel (10) rotates in the opposite direction to the product (12) and continues to feed and squeeze the product (12). At the same time, the upper core mold (7) continues to descend and press the product (12). The inner cavity of the product (12) is supported by the inner core mold (4). The product (12) continues to bend and fold until the product (12) and the forming block (3), the upper core mold (7), the forming wheel (10), and the inner core mold (4) are completely in contact. The forming wheel (10) is withdrawn under the drive of the rotating wheel fixing seat (11), and the upper core mold (7) moves upward and retracts. The spinning is completed. 4) Remove the product (12) from the molding block (3), and then remove the mold core (5), the inner core mold (4) and the ejector (6) from the inner cavity of the product (12).

2. The spinning process for a large-groove, multi-groove, large V-type spinning pulley according to claim 1, characterized in that: The radius of the arc R1 is 8-12mm; The radius of the arc R2 is 14-18mm; The radius of the arc 3R3 is 20-24mm.

3. The spinning process for a large-groove, multi-groove, large V-shaped spinning pulley according to claim 2, characterized in that: The radius of the arc R1 is 9-11 mm; The radius of the arc R2 is 15-17mm; The radius of the arc 3R3 is 21-23mm.

4. The spinning process for a large-groove, multi-groove, large V-shaped spinning pulley according to claim 1, characterized in that: The angle θ between the upper inclined side (901) and the lower inclined side (902) is 1~3° larger than the angle α between the upper side (1201) and the lower side (1202) of the product groove.

5. The spinning process for a large-groove, multi-groove, large V-shaped spinning pulley according to claim 1, characterized in that: The value of N is 2.

Images