A belt pulley spinning clamping device

Abstract

The present invention relates to the field of workpiece processing, and specifically to a belt pulley spinning clamping device. A belt pulley spinning clamping device of the present invention comprises: an upper die, a lower die and a clamping mechanism. The clamping mechanism is fixedly arranged in the inner cavity of the lower die. The clamping mechanism includes engaging balls, engaging ball seats and a clamping top ring. The upper die and the lower die are mutually engaged through the clamping mechanism under the control of a driving device to clamp the workpiece. The engaging ball seats are fixed on the upper side of the inner cavity wall of the lower die. The engaging ball seats are provided with two or more through holes. The engaging balls can be movably placed in the through holes. The upper die is provided with an annular groove. When the clamping mechanism works, the engaging balls move towards the annular groove under the action of the clamping top ring to clamp the workpiece. Through the structural improvement of the upper die, the lower die and the clamping mechanism, the belt pulley spinning clamping device can clamp the workpiece with only a small thrust.

Description

Technical Field

[0001] The present invention relates to the field of workpiece processing, and particularly to a belt pulley spinning clamping device. Background Art

[0002] The belt pulley is one of the important components of an automobile engine, and spinning is the main technology for manufacturing belt pulleys. Whether the workpiece 40 can be effectively clamped during spinning is a key factor in ensuring the spinning quality. The belt pulley spinning clamping mechanism is used to clamp the belt pulley (hereinafter also referred to as the workpiece) during the belt pulley spinning process. The spinning process is the main process for belt pulley production. As shown in Figure 1, it is a schematic diagram of the changes before and after a workpiece blank is processed into a spun product after multiple spinning processes. When spinning the belt pulley, the belt pulley makes a rotational movement and is formed by spinning through multiple spinning wheels 50. During spinning, the material flow is large and the resistance is large, and the workpiece needs to be firmly clamped to ensure the smooth progress of the spinning process.

[0003] In the prior art, the clamping of the belt pulley is usually achieved by applying a large pressure of 70 - 80 tons to the upper die 10 through an oil cylinder 60 to obtain a large frictional force, as shown in Figure 2. The disadvantages of this clamping method are as follows: the large pressure applied by the oil cylinder easily causes fatigue failure of the main shaft bearing, resulting in high maintenance costs; the bearing friction generates a large amount of heat and high energy consumption, and the manufacturing cost is high. Summary of the Invention

[0004] The present invention is to solve at least one defect or problem in the background art, and provides a belt pulley spinning clamping device.

[0005] The present invention provides a belt pulley spinning clamping device, including: an upper die, a lower die, and a clamping mechanism. The clamping mechanism is fixedly arranged in the inner cavity of the lower die. The clamping mechanism includes a clamping ball, a clamping ball seat, and a clamping top ring. The upper die and the lower die are mutually clamped through the clamping mechanism under the control of a driving device to clamp the workpiece.

[0006] The clamping ball seat is fixed on the upper side of the inner cavity wall of the lower die. The clamping ball seat is provided with two or more through holes, and the clamping ball can be movably placed in the through holes.

[0007] The clamping top ring is arranged on the inner side wall of the lower die and can move up and down under the action of a driving force.

[0008] The upper die is provided with an annular groove. When the clamping mechanism works, the clamping ball moves towards the annular groove under the action of the clamping top ring to clamp the workpiece.

[0009] Further, the clamping mechanism further includes a bite ball retaining ring and a spring. The bite ball retaining ring is connected to the lower end of the inner cavity of the clamping top ring through the spring and can move up and down. When the clamping mechanism stops working, the bite ball is positioned in the through hole by the bite ball retaining ring.

[0010] Further, the bite ball retaining ring is arranged between the clamping top ring and the bite ball seat. When the clamping mechanism stops working, the bite ball retaining ring rises under the action of the spring, and the bite ball is positioned in the through hole.

[0011] Further, a tapered surface is provided on the upper side of the clamping top ring. When the working state of the clamping mechanism changes, the bite ball can move inside and outside the tapered surface.

[0012] Further, the tapered surface includes an upper tapered surface and a lower tapered surface;

[0013] When the clamping mechanism works, the bite ball fits with the lower tapered surface;

[0014] When the clamping mechanism stops working, the bite ball is restricted in the groove space formed by the bite ball retaining ring and the upper tapered surface of the inner wall of the clamping top ring.

[0015] Further, the slope of the lower tapered surface is 8° - 15°.

[0016] Further, a circular tapered angle is provided at the lower end of the annular groove. When the clamping mechanism works, the bite ball moves from the lower side of the circular tapered angle along the surface of the tapered angle to the annular groove; when the clamping mechanism stops working, the bite ball moves from the annular groove along the surface of the tapered angle to the lower side of the circular tapered angle.

[0017] Further, the relationship between the outer diameter d1 of the bite ball retaining ring, the diameter d2 of the bite ball, and the inner diameter D3 of the clamping top ring is: d1 + 2d2 ≤ D3.

[0018] Further, the through holes are arranged at equal intervals on the lower end wall of the bite ball seat, and the through holes are evenly distributed in a ring on the lower end wall of the bite ball seat.

[0019] Further, the relationship between the upper end tapered surface diameter D1 of the clamping top ring, the diameter d2 of the bite ball, and the inner diameter D2 of the bite ball seat is: D1 - 2d2 ≥ D2.

[0020] Further, the bite ball is a steel ball.

[0021] The present invention has the following beneficial effects:

[0022] 1. The belt pulley spinning clamping device realizes the clamping of the workpiece with only a small thrust through the structural cooperation of the upper die, lower die and clamping mechanism, eliminating the fatigue failure of the bearing caused by applying a large pressure through the oil cylinder to achieve clamping. Moreover, the clamping between the bearings with a small thrust avoids the problems of large heat generation, high energy consumption and high manufacturing cost caused by bearing friction.

[0023] 2. The upper taper surface and the lower taper surface play a guiding role in the up and down movement of the clamping ball, enabling the locking mechanism to form a self-locking mechanism that is simple in structure and easy to implement. A reliable workpiece clamping mechanism with a large clamping force and reliable function can be achieved without applying a large external pressure, effectively improving the product quality stability.

[0024] 3. By improving the structures of the upper die and the lower die and adding a clamping mechanism to clamp the workpiece, using the force increasing and self-locking characteristics of the small taper angle of the lower taper surface, only a small upward force needs to be applied to the clamping top ring to clamp the workpiece when clamping the workpiece, which has positive advantages in effectively reducing the bearing load, reducing the maintenance frequency, saving energy and electricity, etc.

[0025] To make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0026] Figure 1 is a schematic diagram of the changes before and after a workpiece blank is processed into a spun product through multiple spinning processes;

[0027] Figure 2 is a schematic diagram of clamping a workpiece by applying a large pressure to the upper die through an oil cylinder in the prior art;

[0028] Figure 3 is a schematic diagram of the clamping device clamping the workpiece in an embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of different working states of the clamping device in an embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of before and after the workpiece is clamped and processed by the clamping device in an embodiment of the present invention;

[0031] Figure 6 is a schematic diagram of the lower die and clamping mechanism components of the clamping device in an embodiment of the present invention.

[0032] Reference Signs:

[0033] 10. Upper die, 11. Annular taper angle, 12. Annular groove

[0034] 20. Lower die, 40. Workpiece, 50. Spinning wheel, 60. Oil cylinder

[0035] Clamping mechanism: 31, engaging ball; 32, engaging ball seat; 33, clamping top ring; 34, upper tapered surface; 35, lower tapered surface; 36, through hole; 37, engaging ball retaining ring, 371, top of the engaging ball retaining ring, 372, flange of the engaging ball retaining ring, 373, edge of the engaging ball retaining ring, 374, groove of the engaging ball retaining ring

[0036] 38, spring Detailed implementation manners

[0037] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0038] This application improves the upper die 10 and the lower die 20, and adds a clamping mechanism to clamp the workpiece

[0039] 40, cancels the large pressure applied by the oil cylinder in the prior art, and only needs to apply a small acting force to achieve the clamping of the workpiece 40.

[0040] As shown in FIGS. 3 to 6, the present invention provides a belt pulley spinning clamping device, including: an upper die

[0041] 10, a lower die 20 and a clamping mechanism. The clamping mechanism is fixedly arranged in the inner cavity of the lower die 20. The clamping mechanism includes

[0042] an engaging ball 31, an engaging ball seat 32 and a clamping top ring 33. The upper die 10 and the lower die 20 are mutually engaged through the clamping mechanism under the control of a driving device to clamp the workpiece 40; the engaging ball seat 32 is fixed on the upper side of the inner cavity wall of the lower die 20. The engaging ball seat 32 is provided with two or more through holes 36. The engaging ball 31 can

[0043] be movably placed in the through holes; the clamping top ring 33 is arranged on the inner side wall of the lower die 20 and can move up and down under the action of a driving force; the upper die 10 is provided with an annular groove 12. When the clamping mechanism works, the engaging ball 31

[0044] moves towards the annular groove 12 under the action of the clamping top ring 33 to clamp the workpiece 40. The outer side wall surface of the engaging ball seat 32 is partially attached to the inner side wall surface of the clamping top ring 33, and the engaging ball seat 32 and the clamping top ring

[0045] are partially attached. When the clamping mechanism works, the engaging ball 31

[0046] moves towards the annular groove 12 under the action of the clamping top ring 33 to clamp the workpiece 40. The outer side wall surface of the engaging ball seat 32 is partially attached to the inner side wall surface of the clamping top ring 33, and the engaging ball seat 32 and the clamping top ring

[0047] move towards the annular groove 12 under the action of the clamping top ring 33 to clamp the workpiece 40. The outer side wall surface of the engaging ball seat 32 is partially attached to the inner side wall surface of the clamping top ring 33, and the engaging ball seat 32 and the clamping top ring

[0048] The outer side wall surface of the engaging ball seat 32 is partially attached to the inner side wall surface of the clamping top ring 33, and the engaging ball seat 32 and the clamping top ring

[0049] 33 Relative movement occurs when the clamping mechanism is operating or stopping.

[0050] The upper die 10 can move up and down under the control of the driving device. The upper die 10 descends to separate the workpiece 40 from the lower die.

[0051] After the mold 20 is positioned, the clamping top ring 33 rises under the drive of external force, and the lower taper surface moves the bite ball 31 to

[0052] When the engaging ball 31 is pushed inwardly and the inner wall of the annular groove 12 is in contact with each other, the clamping mechanism clamps the workpiece 40 between the upper die 10 and the lower die 20. The pulley spinning clamping device of the present invention can clamp the workpiece 40 by applying a small thrust to the clamping top ring 33 through the structural coordination of the upper die 10, the lower die 20 and the clamping mechanism, eliminating the fatigue failure of the bearing caused by applying a large pressure to the upper die 10 through the oil cylinder to achieve clamping, and the clamping between the bearings by a small thrust avoids the problems of high heat generation, high energy consumption and high manufacturing cost caused by bearing friction.

[0053] In an embodiment of the present invention, the clamping mechanism further includes a bite ball retaining ring 37 and a spring 38. The bite ball retaining ring 37 is connected to the lower end of the inner cavity of the clamping top ring 33 through the spring 38 so as to be movable up and down. When the clamping mechanism stops working, the bite ball 31 is positioned in the through hole by the bite ball retaining ring 37. The bite ball retaining ring 37 is arranged between the clamping top ring 33 and the bite ball seat 32. When the clamping mechanism stops working, the bite ball retaining ring 37 rises under the action of the spring 38, and the bite ball 31 is positioned in the through hole. The bite ball retaining ring 37 has a circular cap-like structure, including a bite ball retaining ring top 371 and a bite ball retaining ring edge 373. The inner cavity of the bite ball retaining ring top 371 is a hollow structure, and one end of the spring 38 is fixed in the inner cavity of the bite ball retaining ring top 371; the bite ball retaining ring 37 is movably connected to the inner cavity of the clamping top ring 33 up and down through the bite ball retaining ring edge 373; a bite ball retaining ring convex edge 372 is provided on the outer wall surface of the side wall of the bite ball retaining ring top 371. When the clamping mechanism works, a bite ball retaining ring groove 374 is formed between the inner side wall of the clamping top ring 33, the bite ball retaining ring edge 373 and the bite ball retaining ring convex edge 372; when the clamping mechanism stops working, the bite ball retaining ring 37 rises until the bottom end of the bite ball seat 32 fits with the bite ball retaining ring groove 374. It should be noted that the inner side wall surface of the clamping top ring 33 forming the bite ball retaining ring groove 374 is the lower taper surface 35 of the clamping top ring 33 or the inner side wall surface of the clamping top ring 33 below the lower taper surface 35. When the clamping mechanism stops working and the upper die 10 moves upward, after the clamping top ring 33 loses the downward acting force applied by the upper die 10, the compressed spring 38 resets and drives the bite ball retaining ring 37 to move upward, and the bite ball 31 is limited in the bite ball retaining ring groove 374. When the clamping mechanism works, the bite ball 31 is limited between the annular groove 12 and the lower taper surface 35, and when the clamping mechanism stops working, the bite ball 31 is limited in the bite ball retaining ring groove 374.

[0054] In one embodiment of the present invention, a tapered surface is provided on the upper side of the clamping top ring 33. When the working state of the clamping mechanism changes, the bite ball 31 can move inward and outward under the action of the tapered surface. The tapered surface includes an upper tapered surface 34 and a lower tapered surface 35. When the clamping mechanism is working, the bite ball 31 is in contact with the lower tapered surface 35. When the clamping mechanism stops working, the bite ball 31 is confined in the groove space formed by the bite ball retaining ring 34 and the upper tapered surface of the inner wall of the clamping top ring. The slope of the lower tapered surface is 8°~15°. When the clamping mechanism is transformed into the working state, when the upper die 10 descends until its bottom surface touches the upper plane of the bite ball retaining ring 34, the bite ball retaining ring 34 begins to follow and descend, and when the upper die 10 reaches the position of the bite ball 31, under the guidance of the annular cone angle 11 of the upper die 10, the bite ball 31 moves from the inside to the outside in the activity space of the bite ball seat 32, making room for the upper die 10 to continue to move downward. Due to the structural coordination between the upper die 10, the lower die 20 and the clamping mechanism, when the clamping mechanism is transformed into the working state, the oil cylinder or the air cylinder only needs to apply a small force upward to the clamping top ring 33, and the upper die 10 and the lower die 20 can be firmly engaged with each other. The upper tapered surface 34 and the lower tapered surface 35 guide the inward and outward movement of the bite ball 31, so that the locking mechanism forms a self-locking mechanism with a simple structure and is easy to implement. A reliable, high-clamping, and reliable workpiece 40 clamping mechanism can be achieved without applying a large external pressure, effectively improving the stability of product quality.

[0055] In one embodiment of the present invention, an annular cone angle 11 is provided at the lower end of the annular groove 12. When the clamping mechanism is working, the bite ball 31 moves from the lower side of the annular cone angle 11 along the cone angle surface to the annular groove 12; when the clamping mechanism stops working, the bite ball 31 moves from the annular groove 12 along the cone angle surface to the lower side of the annular cone angle 11. The upper mold 10 moves up and down under the control of the driving device. The lower end surface of the upper mold 10 is provided with an annular cone angle 11. The notch on the upper side of the cone angle forms the annular groove 12. The cone angle plays a guiding role in pushing the bite ball 31 outward during the descent of the upper mold 10. When the clamping mechanism is working, the annular groove 12 makes way for the bite ball 31 so that the bite ball 31 fits with the tapered surface of the annular groove 12, forming a self-locking structure that reliably bites the upper mold 10 and the lower mold 20.

[0056] In an embodiment of the present invention, the relationship among the outer diameter d1 of the bite ball retaining ring 37, the diameter d2 of the bite ball 31, and the inner diameter D3 of the clamping top ring 33 is: d1 + 2d2 ≤ D3. The relationship satisfied among the outer diameter d1 of the bite ball retaining ring 37, the diameter d2 of the bite ball 31, and the inner diameter D3 of the clamping top ring 33 enables the clamping top ring 33 to move upward without interfering with the bite ball 31, reliably positioning the bite ball 31 in the groove of the bite ball top ring, making the clamping mechanism perform stably and work reliably, and effectively improving the stability of product quality.

[0057] In an embodiment of the present invention, through holes are arranged at equal intervals on the lower end wall of the bite ball seat 32, and

[0058] the through holes are evenly distributed in a ring shape on the lower end wall of the bite ball seat 32. The through holes are through holes provided on the side wall of the bite ball seat 2

[0059] and penetrating through the side wall of the bite ball 31. There are two or more through holes provided on the side wall of the bite ball seat 32. Preferably, the total number of the through holes is an even number, and the through holes are symmetrically and evenly distributed on the lower end wall of the bite ball seat 2. The through holes evenly distributed on the bite ball seat 2 can ensure the stability of the clamping force intensity of the clamping mechanism when the upper die

[0060] 10 and the lower die 20 are engaged with each other, and can keep the workpiece 40

[0061] stably engaged without deformation.

[0062] In an embodiment of the present invention, the relationship among the upper end taper surface diameter D1 of the clamping top ring 33, the diameter d2 of the bite ball 31, and the inner diameter D2 of the bite ball seat 31 is: D1 - 2d2 ≥ D2. Among them, 2d2 refers to twice of d2. The relationship satisfied among the upper end taper surface diameter D1 of the clamping top ring 33, the diameter d2 of the bite ball 31, and the inner diameter D2 of the bite ball seat 31 enables the upper die 10 to move downward without interfering with the bite ball 31

[0063] and reliably position the bite ball 31 in the groove of the bite ball top ring, making the clamping mechanism perform stably and work reliably, and effectively improving the stability of product quality.

[0064] In an embodiment of the present invention, the bite ball 31 is a steel ball. The bite ball 31 can also be a copper ball, an alumina wear-resistant ceramic ball, or a spherical structure made of other high-strength wear-resistant materials.

[0065] To make the embodiments of the present invention clearer, an embodiment of the present invention gives an example of the processing method of the belt pulley (workpiece) spinning and clamping device. The processing steps are:

[0066] 1. Position and place the workpiece 40 above the lower die 20.

[0067] 2. The upper die 10 moves downward, passes through the central hole of the workpiece 40, and when it reaches the position of the engaging ball 31, the bottom annular taper angle 11 of the upper die 10 pushes the engaging ball 31 to move outward. The upper die 10 continues to move downward until the workpiece 40 is pre-tightened between the upper and lower dies 20. The total downward stroke of the upper die 10 is H1.

[0068] 3. The clamping top ring 33 rises, and its lower taper surface 35 drives the engaging ball 31 to move towards the center until the engaging ball 31 fits against the taper surface in the annular groove 12 of the upper die 10. Under the interaction of the upper taper surface 34, the lower taper surface 35, the engaging ball 31, and the engaging ball seat 32, the workpiece 40 is pulled down and clamped. The total upward stroke of the clamping top ring 33 is H2.

[0069] By improving the structures of the upper die 10 and the lower die 20 and adding a clamping mechanism to clamp the workpiece 40, the present invention utilizes the force increasing and self-locking characteristics of the small taper angle of the lower taper surface. When clamping the workpiece, only a small upward force needs to be applied to the clamping top ring to achieve clamping of the workpiece, which has positive advantages in effectively reducing the bearing load, reducing the maintenance frequency, saving energy and electricity, etc.

[0070] The present invention has the following beneficial effects:

[0071] 1. Through the structural cooperation of the upper die 10, the lower die 20, and the clamping mechanism of the pulley spinning clamping device, only a small thrust is required to clamp the workpiece 40, eliminating the fatigue failure of the bearing caused by applying a large pressure through an oil cylinder. Moreover, clamping between the bearings through a small thrust avoids the problems of large heat generation, high energy consumption, and high manufacturing cost caused by bearing friction.

[0072] 2. The upper taper surface 34 and the lower taper surface 35 play a guiding role in the up and down movement of the engaging ball 31, enabling the locking mechanism to form a self-locking mechanism that is simple in structure and easy to implement. Without applying a large external pressure, a reliable, high-clamping force, and reliable clamping mechanism for the workpiece 40 can be achieved, effectively improving the product quality stability.

[0073]

[0074]

[0075]

[0076]

[0077] ​​​​3. By improving the structures of the upper die 10 and the lower die 20 and adding a clamping mechanism to clamp the workpiece 40, and utilizing the force-increasing and self-locking characteristics of the small taper angle of the lower taper surface, when clamping the workpiece, only a small upward force needs to be applied to the clamping top ring to achieve clamping of the workpiece, which has positive advantages in effectively reducing the bearing load, reducing the maintenance frequency, saving energy and electricity, etc.

[0078] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A belt pulley spinning clamping device, characterized in that, Including: An upper die, a lower die and a clamping mechanism. The clamping mechanism is fixedly arranged in the inner cavity of the lower die. The clamping mechanism includes a clamping ball, a clamping ball seat and a clamping top ring. The upper die and the lower die are mutually clamped by the clamping mechanism under the control of a driving device to clamp a workpiece. The clamping ball seat is fixed on the upper side of the inner cavity wall of the lower die. The clamping ball seat is provided with two or more through holes, and the clamping ball can be movably placed in the through holes. The clamping top ring is arranged on the inner side wall of the lower die and can move up and down under the action of a driving force. The upper die is provided with an annular groove. When the clamping mechanism works, the clamping ball moves towards the annular groove under the action of the clamping top ring to clamp the workpiece.

2. The device according to claim 1, characterized in that: The clamping mechanism further includes a clamping ball retaining ring and a spring. The clamping ball retaining ring is connected to the lower end of the inner cavity of the clamping top ring through the spring and can move up and down. When the clamping mechanism stops working, the clamping ball is positioned in the through hole by the clamping ball retaining ring.

3. The device according to claim 2, characterized in that: The clamping ball retaining ring is arranged between the clamping top ring and the clamping ball seat. When the clamping mechanism stops working, the clamping ball retaining ring rises under the action of the spring, and the clamping ball is positioned in the through hole.

4. The device according to claim 1, wherein: A taper surface is arranged on the upper side of the clamping top ring. When the working state of the clamping mechanism changes, the clamping ball can move in and out under the action of the taper surface.

5. The device according to claim 4, characterized in that: The taper surface includes an upper taper surface and a lower taper surface. When the clamping mechanism works, the clamping ball fits with the lower taper surface. When the clamping mechanism stops working, the clamping ball is restricted in the groove space formed by the clamping ball retaining ring and the upper taper surface of the inner wall of the clamping top ring.

6. The device according to claim 5, characterized in that: The slope of the lower taper surface is 8°-15°.

7. The device according to claim 1, characterized in that: An annular taper angle is arranged at the lower end of the annular groove. When the clamping mechanism works, the clamping ball moves from the lower side of the annular taper angle along the surface of the taper angle to the annular groove; when the clamping mechanism stops working, the clamping ball moves from the annular groove along the surface of the taper angle to the lower side of the annular taper angle.

8. The device according to claim 1, characterized in that: The relationship among the outer diameter d1 of the clamping ball retaining ring, the diameter d2 of the clamping ball and the inner diameter D3 of the clamping top ring is: d1 + 2d2 ≤ D3.

9. The device according to claim 1, characterized in that: The through holes are arranged at equal intervals on the lower end wall of the clamping ball seat, and the through holes are evenly distributed in a ring on the lower end wall of the clamping ball seat.

10. The device according to claim 9, characterized in that: The relationship among the upper end taper surface diameter D1 of the clamping top ring, the diameter d2 of the clamping ball and the inner diameter D2 of the clamping ball seat is: D1 - 2d2 ≥ D2.

11. The device according to any one of claims 1 to 10, characterized in that: The clamping ball is a steel ball.

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