Riveting tool and riveting method

Abstract

The invention provides a riveting tool and a riveting method, and relates to the technical field of valve device production, according to the riveting tool, axial movement of an ejector rod is converted into lateral sliding of a ball head through an obliquely-arranged driving face, the lateral sliding of the ball head is used for abutting against a to-be-riveted part to generate expansion deformation, riveting is achieved, and in the riveting process, the riveting efficiency is greatly improved. The riveting tool does not elastically deform, so that the riveting tool is not prone to damage, and the consistency of the riveting amount of riveted products is easily guaranteed. And moreover, during riveting, the ball head can play a guiding role, so that the joint assembled with the ball head is more easily inserted into the to-be-riveted piece.

Description

Technical Field

[0001] The present application relates to the technical field of valve device production, and particularly relates to a riveting tooling and a riveting method. Background Art

[0002] Common riveting tooling rivets the valve body and the connecting pipe of the valve device together. During riveting, the riveting tooling undergoes elastic deformation. After riveting is completed, the riveting tooling resets. Repeated elastic deformation causes the riveting tooling to be easily damaged, and the riveting tooling needs to be frequently replaced, resulting in a high assembly cost of the valve device. Moreover, after repeated elastic deformation, the deformation ability of the riveting tooling decreases, resulting in poor consistency of the riveting amount of the valve device.

[0003] In view of this, how to improve the riveting tooling is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] To solve the above technical problems, the present application provides a riveting tooling, which includes:

[0005] A joint, the joint is provided with an insertion hole portion and a plurality of circular hole portions. The insertion hole portion extends along the axial direction of the joint. The circular hole portions are sequentially arranged at intervals in the circumferential direction of the joint. The circular hole portions are located on the side of the insertion hole portion. One side of the circular hole portion close to the insertion hole portion is communicated with the insertion hole portion, and a through hole portion is provided on the side of the circular hole portion far from the insertion hole portion;

[0006] A ball head, one ball head is assembled in each circular hole portion. The ball head can slide laterally along the circular hole portion, and one side of the ball head far from the insertion hole portion can pass through the through hole portion;

[0007] A ejector rod, the ejector rod includes a tip portion. The tip portion is inserted into the insertion hole portion. The tip portion can move axially along the insertion hole portion. A driving surface is provided on the outer periphery of the tip portion. The driving surface is inclined relative to the central axis of the insertion hole portion. The driving surface can abut against one side of the ball head close to the insertion hole portion to drive the ball head to slide laterally along the circular hole portion.

[0008] The present application also provides a riveting method, which is realized based on the riveting tooling provided by the present application. The riveting method includes the following steps:

[0009] Insert the first workpiece to be riveted into the second workpiece to be riveted, and insert the joint and the ball head of the riveting tooling into the first workpiece to be riveted;

[0010] Then drive the ejector rod of the riveting tooling to move forward along the insertion hole portion of the joint until the ball head reaches the target sliding amount;

[0011] Then drive the ejector rod to move reversely along the jacking part, so that the ball head resets in the direction close to the jacking part.

[0012] The riveting tooling provided by this application uses the inclined driving surface to convert the axial movement of the ejector rod into the lateral sliding of the ball head, and uses the lateral sliding of the ball head to press the part to be riveted to expand and deform to achieve riveting. During the riveting process, the riveting tooling does not undergo elastic deformation, making the riveting tooling not easily damaged, and it is easy to ensure the consistency of the riveting amount of the riveted product. Moreover, during riveting, the ball head can play a guiding role, making it easier to insert the joint assembled with the ball head into the part to be riveted. Brief Description of the Drawings

[0013] Figure 1 is a perspective view of an embodiment of the riveting tooling provided by this application;

[0014] Figure 2 is Figure 1 a perspective view of the tip parts of the middle joint, the ball head and the ejector rod;

[0015] Figure 3 is Figure 2 a cross-sectional view of

[0016] Figure 4 is Figure 1 a perspective view of the middle joint;

[0017] Figure 5 is Figure 1 a perspective view of a single ball head in

[0018] Figure 6 is Figure 1 a cross-sectional view of the ejector rod in

[0019] Figure 7 is a perspective view of using the Figure 1 shown riveting tooling to rivet the valve body and the connecting pipe;

[0020] Figure 8 is Figure 7 a partial cross-sectional view of

[0021] The descriptions of the reference numerals are as follows:

[0022] 1 Riveting tooling; 11 Joint, 111 Jacking part, 112 Round hole part, 113 Step surface, 114 Limiting part; 12 Ball head, 121 Cylindrical mating part; 13 Ejector rod, 131 Tip part, 1311 Driving surface, 132 Shank part, 1321 Axial hole part, 1322 Radial threaded hole part; 14 First positioning part; 15 Second positioning part; 16 Power element; 17 Bracket.

[0023] 2 Valve body.

[0024] 3 Connecting pipe. Specific Embodiment

[0025] To enable those skilled in the art of the present technology to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The present application provides a riveting tooling 1.

[0027] As Figures 1-6 shown, the riveting tooling 1 provided by the present application includes a joint 11, a ball head 12, and a ejector rod 13.

[0028] The joint 11 is provided with a socket part 111 and a plurality of circular hole parts 112. The socket part 111 extends along the axial direction of the joint 11. Each circular hole part 112 is sequentially arranged at intervals in the circumferential direction of the joint 11. More specifically, each circular hole part 112 can be arranged at equal angular intervals on the entire circumference of the joint 11.

[0029] The circular hole part 112 is located on the side of the socket part 111. The side of the circular hole part 112 close to the socket part 111 is communicated with the socket part 111. The side of the circular hole part 112 far from the socket part 111 is provided with a through port part.

[0030] One ball head 12 is assembled in each circular hole part 112. The ball head 12 can slide laterally along the circular hole part 112, and the side of the ball head 12 far from the socket part 111 can pass through the through port part.

[0031] The ejector rod 13 includes a tip part 131. The tip part 131 is inserted into the socket part 111. The tip part 131 can move axially along the socket part 111. A driving surface 1311 is provided on the outer periphery of the tip part 131. The driving surface 1311 is inclined with respect to the central axis of the socket part 111. The driving surface 1311 can abut against the side of the ball head 12 close to the socket part 111 to drive the ball head 12 to slide laterally along the circular hole part 112.

[0032] More specifically, the joint 11, the ball head 12, and the ejector rod 13 can all be made of steel material, for example, 65Mn spring steel material.

[0033] The present application also provides a riveting method, which is implemented based on the riveting tooling 1 provided by the present application. As Figure 7 and Figure 8 shown, the riveting method includes the following steps:

[0034] Insert the first workpiece to be riveted (referred to as 3 in the figure) into the second workpiece to be riveted (referred to as 2 in the figure), and insert the joint 11 and the ball head 12 of the riveting tooling 1 into the first workpiece to be riveted.

[0035] Then, drive the ejector rod 13 of the riveting tooling 1 to move forward along the jacking hole portion 111 (move upward in the figure). At this time, the driving surface 1311 will gradually push against the ball head 12 to slide toward the side away from the jacking hole portion 111, so that the side of the ball head 12 away from the jacking hole portion 111 gradually passes through the through hole portion and presses against the first workpiece to be riveted to expand and deform, thereby gradually riveting the first workpiece to be riveted with the second workpiece to be riveted. This process continues until the ball head 12 reaches the target sliding amount.

[0036] Then, drive the tip portion 131 to move backward along the jacking hole portion 111 (move downward in the figure) so that the ball head 12 can reset toward the direction close to the jacking hole portion 111.

[0037] More specifically, in the illustrated embodiment, the first workpiece to be riveted is the pipe joint 3 of the valve device, and the second workpiece to be riveted is the valve body 2 of the valve device. After the pipe joint 3 and the valve body 2 are riveted, welding can be further performed along the circumferential direction of the pipe joint 2.

[0038] More specifically, the reverse movement distance of the tip portion 131 can be controlled so that after the reverse movement of the tip portion 131, it is not lower than the top hole of the jacking hole portion 111. For example, after the reverse movement of the tip portion 131, it can be more than 2 mm higher than the top hole of the jacking hole portion 111. This can avoid the problem that the tip portion 131 is not easily moved between the ball heads 12 during the next riveting due to the ball head 12 resetting too much toward the direction close to the jacking hole portion 111.

[0039] As can be seen from the above description, the riveting tooling 1 provided in this application uses the obliquely arranged driving surface 1311 to convert the axial movement of the ejector rod 13 into the lateral sliding of the ball head 12, and uses the lateral sliding of the ball head 12 to press against the workpiece to be riveted to expand and deform to achieve riveting. During the riveting process, the riveting tooling 1 does not undergo elastic deformation, making the riveting tooling 1 not easily damaged and facilitating the guarantee of the consistency of the riveting amount of the riveted product.

[0040] Moreover, during riveting, the ball head 12 can play a guiding role, making it easier to insert the joint 11 equipped with the ball head 12 into the first workpiece to be riveted.

[0041] In addition, after the pipe joint 3 and the valve body 2 of the valve device are riveted using the above-mentioned riveting tooling 1, the gap between the pipe joint 3 and the valve body 2 is small, making it easy to operate during subsequent circumferential welding along the pipe joint 3, and the weld width after welding is small. Therefore, the connection reliability is high.

[0042] In one embodiment, the slope of the driving surface 1311 is configured such that: 6° ≤ α ≤ 8°. Within this range, the stroke of the ejector rod 13 does not need to be too large to enable the ball head 12 to reach the target sliding amount, which is beneficial to ensuring a high riveting efficiency. Moreover, when the ejector rod 13 moves a small distance, the sliding amount of the ball head 12 will not be too large, so that the ball head 12 can gradually reach the target sliding amount smoothly without suddenly exceeding the target sliding amount.

[0043] In one embodiment, the maximum sliding amount of the ball head 12 is designed to be not less than 0.8 mm. This range can ensure sufficient riveting amount, thereby ensuring riveting tightness. More specifically, taking the illustrated perspective as an example, when the tip 131 moves upward from below the ball head 12, the upper end of the driving surface 1311 first abuts against the ball head 12, then the lower end of the driving surface 1311 abuts against the ball head 12, and then the lower end of the driving surface 1311 separates from the ball head 12. The maximum sliding amount of the ball head 12 refers to the lateral sliding amount of the ball head 12 within the stroke from when the upper end of the driving surface 1311 abuts against the ball head 12 to when the lower end of the driving surface 1311 separates from the ball head 12. The maximum sliding amount of the ball head 12 is determined by the length and slope of the driving surface 1311.

[0044] In one embodiment, the driving surface 1311 is a conical driving surface. In the illustrated first and second embodiments, the driving surface 1311 is a conical driving surface. The conical driving surface is relatively convenient to machine and can abut against multiple ball heads 12 simultaneously.

[0045] In one embodiment, the driving surface 1311 is an inclined surface driving surface. When it is an inclined surface driving surface, a plurality of inclined surface driving surfaces need to be arranged at intervals in the circumferential direction of the joint 11, and each inclined surface driving surface correspondingly abuts against one ball head 12.

[0046] In one embodiment, the ball head 12 is provided with a cylindrical fitting portion 121, and the cylindrical fitting portion 121 is in guiding fit with the circular hole portion 112. The guiding fit clearance is preferably 0.05 mm - 0.15 mm, so as to guide the lateral sliding of the ball head 12 and improve the sliding smoothness of the ball head 12.

[0047] In one embodiment, the outer periphery of the joint 11 is provided with a stepped surface 113. During riveting, one end of the first workpiece to be riveted abuts against the stepped surface 113 (see Figure 8 , one end of the sleeve 3 abuts against the stepped surface 113), thereby restricting the depth of insertion of the joint 11 into the first workpiece to be riveted.

[0048] In one embodiment, the joint 11 can also be provided with a limiting portion 114. During riveting, the joint 11 is also inserted into the second workpiece to be riveted and is in limiting fit with the second workpiece to be riveted (see Figure 8 , the limiting portion 114 of the joint 11 is in limiting fit with the valve body 2), thereby restricting the relative position of the joint 11 and the second workpiece to be riveted.

[0049] In one embodiment, the ejector rod 13 further includes a shank portion 132. The tip portion 131 and the shank portion 132 are separately provided and detachably assembled together. In this way, after the tip portion 131 is worn, only the tip portion 131 needs to be replaced without replacing the shank portion 132.

[0050] More specifically, as Figure 6 shown, the diameter of the shank portion 132 is larger than that of the tip portion 131. An axial hole portion 1321 and a radial threaded hole portion 1322 can be provided on the shank portion 132. One end of the tip portion 131 is inserted into the axial hole portion 1321, and a screw (not shown in the figure) is connected in the radial threaded hole portion 1322 to press against the outer periphery of the tip portion 131.

[0051] In one embodiment, both the tip portion 131 and the ball head 12 have magnetism, and the tip portion 131 and the ball head 12 attract each other. With such a design, when the tip portion 131 moves in the reverse direction, it can attract each ball head 12 to reset in the direction close to the jack portion 111. More specifically, a magnetizer can be used to strongly magnetize the tip portion 131 and the ball head 12 so that they have magnetism.

[0052] In one embodiment, the riveting tooling 1 further includes a first positioning portion 14, a second positioning portion 15, a power element 16 and a bracket 17. The first positioning portion 14 is used to position the first workpiece to be riveted. The second positioning portion 15 is used to position the second workpiece to be riveted. The first positioning portion 14, the second positioning portion 15 and the joint 11 are all fixed to the bracket 17. The power element 16 is connected to the ejector rod 13 to drive the ejector rod 13 to move axially along the jack portion 111.

[0053] More specifically, the power element 16 can be a cylinder, and the piston rod of the cylinder is connected to the shank portion 132 of the ejector rod 13.

[0054] More specifically, when the first workpiece to be riveted is the connecting pipe 3 of the valve device, the first positioning portion 14 can include a positioning post adapted to the inner circumference of the connecting pipe 3. During riveting, one end of the connecting pipe 3 is sleeved outside the positioning post, and the other end of the connecting pipe 3 is inserted into the valve body 2 of the valve device. When the second workpiece to be riveted is the valve body 2 of the valve device, the first positioning portion 14 can include a positioning groove adapted to the outer circumference of the valve body 2, and the valve body 2 is supported on the first positioning portion 14 and sinks into the positioning groove.

[0055] The above embodiments can be freely combined without conflict.

[0056] The above uses specific examples to elaborate on the principle and implementation of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A riveting tooling, characterized in that, The riveting tooling includes: A joint, the joint is provided with a jacking portion and a plurality of round hole portions. The jacking portion extends along the axial direction of the joint. Each of the round hole portions is sequentially arranged at intervals in the circumferential direction of the joint. The round hole portion is located on the side of the jacking portion. One side of the round hole portion close to the jacking portion is communicated with the jacking portion, and a through port portion is provided on the side of the round hole portion far from the jacking portion; Ball heads, one ball head is assembled in each of the round hole portions. The ball head can slide laterally along the round hole portion. One side of the ball head far from the jacking portion can pass through the through port portion; A ejector rod, the ejector rod includes a tip portion. The tip portion is inserted into the jacking portion. The tip portion can move axially along the jacking portion. A driving surface is provided on the outer periphery of the tip portion. The driving surface is inclined relative to the central axis of the jacking portion. The driving surface can abut against one side of the ball head close to the jacking portion to drive the ball head to slide laterally along the round hole portion.

2. The riveting tooling according to claim 1, characterized in that, The range of the slope α of the driving surface is: 6°≤α≤8°.

3. The riveting tooling according to claim 1, wherein The driving surface is a conical driving surface.

4. The riveting tooling according to claim 1, characterized in that The ball head is provided with a cylindrical fitting portion. The cylindrical fitting portion is in guiding fit with the round hole portion to guide the lateral sliding of the ball head.

5. The riveting tooling according to any one of claims 1-4, characterized in that The maximum lateral sliding amount of the ball head is not less than 0.8 mm.

6. The riveting tooling according to any one of claims 1-4, characterized in that, A step surface is provided on the outer periphery of the joint. During riveting, the workpiece to be riveted abuts against the step surface.

7. The riveting tooling according to any one of claims 1-4, characterized in that, The ejector rod further includes a handle portion. The tip portion and the handle portion are separately provided and can be detachably assembled together.

8. The riveting tooling according to any one of claims 1-4, characterized in that, Both the tip portion and the ball head have magnetism, and the tip portion and the ball head attract each other.

9. The riveting tooling according to any one of claims 1-4, characterized in that The riveting tooling further includes a first positioning portion, a second positioning portion, a power element and a bracket. The first positioning portion, the second positioning portion and the joint are all fixed on the bracket. The first positioning portion and the second positioning portion are respectively used for positioning a first workpiece to be riveted and a second workpiece to be riveted. The power element is connected to the ejector rod to drive the ejector rod to move axially along the jacking portion.

10. A riveting method, characterized in that, Based on the riveting tooling according to any one of claims 1-9, the riveting method includes the following steps: Insert the first workpiece to be riveted into the second workpiece to be riveted, and insert the joint and the ball head of the riveting tooling into the first workpiece to be riveted; Then drive the ejector rod of the riveting tooling to move forward along the jacking portion of the joint until the ball head reaches the target sliding amount; Then drive the ejector rod to move backward along the jacking portion to reset the ball head in the direction close to the jacking portion.

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