Integrated punching and welding device and method for electric contacts

Abstract

The present invention discloses an integrated punching and welding device and method for electric contacts, the device comprising: a feeding mechanism, a cutting mechanism, a stamping mechanism, a conveying mechanism, a supporting component, a positioning component, an upper electrode and a lower electrode. The method is: firstly, punching a material strip and cutting the silver wire, then conveying the pre-punched material strip and the cut silver spot to the spot welding position, and finally, powering on to complete the spot welding, wherein the cutting mechanism and the stamping mechanism process the silver wire and the material strip into the electric contact and the pre-punched material strip. The conveying mechanism conveys the electric contact and the punched material strip to the spot welding position. The positioning mechanism makes the electric contact in close contact with the material strip. The present invention can obtain an integrated punching and welding electric contact assembly with excellent welding quality and matching sizes of various components of the electric contact. The method and device involved in the present invention are suitable for electric contacts of various complex shapes, and the welding speed is greatly improved, and the production cost is greatly reduced.

Description

Technical Field

[0001] The present invention relates to a forming device and method for an electric contact, and in particular to a punching and welding integrated device and method for an electric contact, and finally a punching and welding integrated product is obtained. Background Art

[0002] As the core component of switching electrical appliances, the electrical contact assembly is responsible for breaking and conducting current. The quality of its welding plays a decisive role in the switching capacity, arc burn resistance, service life, and safe and reliable operation of the entire appliance.

[0003] Before welding, electrical contacts often need to go through processes including stamping and feeding, and then welded to form components. Currently, many manufacturers independently produce and process each component, and multiple operations lead to product size matching and secondary pollution problems, which in turn leads to reduced product quality stability and consistency of electrical contact components. At the same time, different stamping and welding processes and different use environments will also seriously affect the consistency of the quality of electrical contacts.

[0004] Therefore, designing an integrated production equipment and method that organically combines material stamping, automatic feeding, and component welding is an urgent problem to be solved in the electrical industry, and it is also a prerequisite for further expanding the application of the electrical industry.

[0005] After searching, the Chinese invention patent CN201510320597.2 is to place the sheet parts in the die in advance, and place another sheet part on its upper surface, and then load the current without removing the stamped parts to realize the resistance spot welding of the automotive sheet parts. The device uses the die and magnetorheological damper to realize the integrated production of stamping and welding. However, the device is only applicable to the case where the shape of the welded parts is regular. Once the shape of the welded parts is complex and irregular, the difficulty of preparing the die and coordinating the matching electrodes will be greatly increased, and the cost will increase, which to a certain extent limits the application of integrated stamping and welding products. Summary of the invention

[0006] In view of the shortcomings and defects of the prior art, the present invention provides an integrated punching and welding device and method for electrical contacts, in which the material strip is punched into a stamped part, the wire is cut and processed into an electrical contact, and the electrical contact and the stamped part are welded together. These three processes are integrated into one device to obtain an integrated punching and welding electrical contact assembly product.

[0007] The present invention fully considers the influence of multiple target factors in the production process of the electric contact assembly product, and solves the problems of poor consistency of welding quality of the existing electric contact assembly, mismatched sizes of various components of the electric contact, and low versatility of the existing integrated equipment.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is:

[0009] According to a first aspect of the present invention, there is provided an integrated punching and welding device for electric contacts, comprising: a feeding mechanism, a cutting mechanism, a punching mechanism, a conveying mechanism, a supporting component, a positioning component, an upper electrode and a lower electrode, wherein:

[0010] The feeding mechanism is used to convey the silver wire to the cutting position;

[0011] The cutting mechanism is used to cut the silver wires conveyed by the feeding mechanism into electrical contacts, and push the cut electrical contacts to the spot welding position through the feeding mechanism;

[0012] The punching mechanism is located in the unwelded area of ​​the material strip and is used to punch the material strip into a desired shape;

[0013] The conveying mechanism is used to convey the stamped material strip of the stamping mechanism to the spot welding position;

[0014] The supporting component, the positioning component, the upper electrode and the lower electrode are located on four sides of the punched material strip, and the four sides are parallel to the conveying direction of the material strip. Through the cooperation of these four components, the electrical contacts located at the spot welding position are in close contact with the punched material strip, and the lower electrode and the upper electrode conduct current to complete spot welding.

[0015] Preferably, a channel for conveying the silver wire is provided inside the feeding mechanism, and the channel is parallel to the surface to be welded of the electrical contact.

[0016] More preferably, the cutting mechanism uses a cutting knife, and the cutting knife is perpendicular to the channel for conveying the silver wire in the feeding mechanism.

[0017] Preferably, the device further includes a connecting mechanism, the upper electrode is assembled at one end of the connecting mechanism, and the connecting mechanism drives the upper electrode to press the electric contact toward the spot welding position, so that the electric contact is in close contact with the stamped material strip, and the working surface of the upper electrode is parallel to the surface to be welded of the electric contact.

[0018] Preferably, the upper electrode corresponds to the position of the supporting component, the lower electrode corresponds to the position of the positioning component, and the upper electrode is located above the lower electrode.

[0019] Preferably, the transmission mechanism is composed of rollers, and the stamped strip is placed on the rollers and transmitted to the spot welding position.

[0020] Preferably, the upper electrode is a gear-type upper electrode.

[0021] Preferably, the supporting component, the positioning component, the upper electrode and the lower electrode are located on four side surfaces of the punched material strip, and the four side surfaces are parallel to the conveying direction of the material strip.

[0022] Preferably, the punching mechanism is located in a non-welded area of ​​the material strip.

[0023] According to a second aspect of the present invention, a method for integrated punching and welding of electrical contacts is provided, wherein a material strip is used as a punching object and a silver wire is used as a cutting object. The material strip is first punched and the silver wire is cut. Then, the pre-punched material strip and the cut silver wire are transferred to a spot welding position. Finally, power is turned on to complete the spot welding.

[0024] Specifically, the method comprises the following steps:

[0025] In the first step, the strip is punched into the desired shape and the silver wire is cut into electrical contacts;

[0026] Step 2: transport the stamped material strip and the electrical contact to the spot welding position, and fix the stamped material strip and the electrical contact;

[0027] The third step is to arrange the supporting component, the positioning component, the upper electrode and the lower electrode on the four sides of the stamped material strip, and these four sides are parallel to the conveying direction of the material strip; through the cooperation between the supporting component, the positioning component, the upper electrode and the lower electrode, the electrical contact is in close contact with the stamped material strip, and the upper electrode and the lower electrode are energized to complete the spot welding action.

[0028] Preferably, punching the material strip into the desired shape means that the material strip is conveyed to the punching position of the punching mechanism through the roller of the punching mechanism, and the punching mechanism punches the material strip into the desired shape.

[0029] Preferably, the silver wire is cut into electrical contacts means that: the silver wire is conveyed to the cutting position by a feeding mechanism, and a cutting knife cuts the silver wire into silver dots, i.e., electrical contacts.

[0030] Preferably, the material strip and the electric contact are conveyed to the spot welding position, which means that the pre-punched material strip is conveyed to the spot welding position by a roller, and the electric contact is pushed to the spot welding position by a feeding mechanism;

[0031] Preferably, fixing the material strip and the electric contact means that the positioning plate is pressed against the material strip so that the material strip is close to the lower electrode; the connecting mechanism is connected to the upper electrode, and the connecting mechanism drives the upper electrode to press against the electric contact at the spot welding position so that the electric contact is in close contact with the material strip, and the material strip is supported and positioned by the support seat.

[0032] Preferably, the energizing the upper and lower electrodes means that the spot welding action is completed by conducting current to the lower electrode and the upper electrode, and finally a punching and welding integrated product is obtained.

[0033] The working principle of the integrated punching and welding device and method of the present invention is: the cutting knife cuts the silver wire into electrical contacts, and the punching mechanism punches the material strip into the required shape. The feeding mechanism conveys the silver wire to the cutting position, and then pushes the cut electrical contacts to the spot welding position. The roller conveys the punched material strip to the spot welding position. The lower electrode corresponds to the position of the positioning plate, and the upper electrode corresponds to the position of the support seat. The positioning plate presses the lower electrode, and the connecting mechanism drives the upper electrode, which is then pressed against the support seat, so that the electrical contacts are in close contact with the punched material strip.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The traditional production process is that each component is produced and processed independently, and multiple operations are prone to product size matching problems and secondary pollution problems, resulting in poor stability and consistency of component product quality. Compared with the traditional method, the present invention integrates multiple processes such as punching, cutting, and welding into an integrated process, which is not affected by the matching of accessory sizes, greatly reduces secondary pollution of components, and effectively improves the stability and consistency of component quality.

[0036] 2. Compared with traditional methods and devices, the present invention shortens the processing links, improves production efficiency, and at the same time reduces the equipment footprint and the number of operators, thereby reducing production costs.

[0037] 3. Furthermore, compared with the existing integrated equipment, the device of the present invention is not limited by the shape of the parts to be welded, and electrodes can be matched in a variety of ways according to components of different shapes. The device has a wide range of applications and good versatility.

[0038] In summary, the present invention can obtain a punching and welding integrated electric contact assembly with excellent welding quality and matching sizes of various electric contact components, and is suitable for electric contacts of various complex shapes. The welding speed is greatly improved, the production cost is greatly reduced, and it has significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1a It is a schematic diagram of an integrated punching and welding device for electric contacts in one embodiment of the present invention;

[0040] Among them: 101-silver wire, 102-cutting knife, 103-lower electrode, 104-feeding mechanism, 105-material belt, 106-connecting mechanism, 107-upper electrode, 108-electrical contact (silver point), 109-positioning plate, 110-support seat, 111-stamping mechanism, 113-pressure mechanism.

[0041] Figure 1b It is a cross-sectional schematic diagram of the spot welding position in the punching and welding integrated device in one embodiment of the present invention;

[0042] Among them: 103 - lower electrode, 105 - material strip, 107 - upper electrode, 108 - electrical contact, 109 - positioning plate, 112 - surface of the electrical contact to be welded.

[0043] Figure 2 This is a physical picture of the punching and welding integrated finished product in one embodiment of the present invention;

[0044] Among them: 201-electric contact, 202-punched strip. DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0046] like Figure 1a , 1b and Figure 2 As shown, in the following embodiments of the present invention, a method for AgCu3 / CuNi 18 Zn 20 The integrated punching and welding device for electric contacts comprises a cutting knife 102, a lower electrode 103, a feeding mechanism 104, a connecting mechanism 106, a gear-shaped upper electrode 107, a positioning plate 109, a supporting seat 110, a punching mechanism 111 and a conveying mechanism. Among them:

[0047] The feeding mechanism 104 is used to deliver the silver wire 101 to the cutting position;

[0048] The cutting knife 102 is used to cut the silver wire 101 delivered by the feeding mechanism 104 into electrical contacts 108, and push the cut electrical contacts 108 to the spot welding position through the feeding mechanism 104;

[0049] The punching mechanism 111 is located in the unwelded area of ​​the material strip 105 and is used to punch the material strip 105 into a desired shape;

[0050] The conveying mechanism is used to convey the stamped material strip of the stamping mechanism 111 to the spot welding position;

[0051] The support seat 110, the positioning plate 109, the gear-shaped upper electrode 107 and the lower electrode 103 are located on the four sides of the punched material strip, and the four sides are parallel to the conveying direction of the material strip; through the cooperation of these four components, the electrical contacts located at the spot welding position are in close contact with the punched material strip, and the lower electrode 103 and the upper electrode 07 conduct current to complete spot welding.

[0052] In the above device, the support seat 110 is used to support the material belt so that it does not move within the plane where the material belt is located. Figure 1a There is also a pressure mechanism 113, Figure 1a The connecting mechanism 106 is used to connect the pressure mechanism 113 and the upper electrode 107, so that the upper electrode 107 and the pressure mechanism 113 are assembled together. In this way, during welding, the pressure of the electrode loaded on the product can be changed by adjusting the pressure of the pressure mechanism 113, thereby changing the pressure required for welding.

[0053] In a preferred embodiment, the transmission mechanism is formed by rollers, and the stamped strip is placed on the rollers and is transmitted to the spot welding position.

[0054] In some embodiments, the feeding mechanism 104 has a channel for conveying the AgCu3 silver wire 101 inside, and the channel is parallel to the surface 112 of the AgCu3 silver dot 108 to be welded.

[0055] The cutting knife 102 is perpendicular to the channel for conveying the AgCu3 silver wire 101 inside the feeding mechanism 104 .

[0056] In some embodiments, the gear-shaped upper electrode 107 is assembled at one end of the connecting mechanism 106, and the working surface of the gear-shaped upper electrode 107 is parallel to the surface to be welded 112 of the AgCu3 silver dot 108. The gear-shaped electrode 107 is used here, one of the functions is to replace the cylindrical electrode for spot welding. During resistance welding, the teeth of the gear electrode 107 close to the electric contact 118 will heat up, and thermal fatigue will occur during multiple welding here, which is not conducive to the welding performance of the product. The present invention does not need to replace all the upper electrodes 107, but only needs to adjust the teeth of the gear, which reduces the time for replacing the upper electrode 107 and improves the utilization rate of the electrode; the second function is that the gear-shaped upper electrode 107 does not need to be processed with a heat sink inside the electrode like the traditional cylindrical electrode, and it is more convenient to replace the electrode during the automated welding process; the third function is that the upper electrode 107 is made into a gear shape, which increases the surface area, and is more conducive to heat dissipation and heat conduction during welding, thereby improving the welding performance of the product.

[0057] In some embodiments, the gear-shaped upper electrode 107 corresponds to the support seat 110, and the lower electrode 103 corresponds to the positioning plate 109, respectively located at the punched CuNi 18 Zn 20 The four sides of the strip 105 are all connected to the CuNi 18 Zn 20 The material strips 105 are parallel to the conveying direction 113 .

[0058] The gear-shaped upper electrode 107 corresponds to the support seat 110 , the lower electrode 103 corresponds to the positioning plate 109 , and the gear-shaped upper electrode 107 is located above the lower electrode 103 .

[0059] In the operation of this embodiment, the positioning plate 109 is pressed against the lower electrode 103, and the gear-shaped upper electrode 107 is pressed against the support seat 110, so that the electrical contact is in close contact with the punched strip, and the lower electrode 103 and the gear-shaped upper electrode 107 conduct current to complete spot welding. Of course, in other embodiments, the positions of the above-mentioned components can also be adjusted, as long as the above-mentioned four components located on the four sides of the punched strip can make the electrical contact located at the spot welding position in close contact with the punched strip, and the lower electrode 103 and the upper electrode 07 conduct current to complete spot welding, the purpose of the present invention can be achieved.

[0060] The punching mechanism 111 is located in CuNi 18 Zn 20 Unwelded area of ​​the strip 105 .

[0061] The working principle of the integrated punching and welding device is as follows: the cutting knife 102 cuts the AgCu3 silver wire 101 into AgCu3 silver dots 108, and the punching mechanism 111 18 Zn 20 The material strip 105 is punched into a desired shape. The feeding mechanism 104 conveys the AgCu3 silver wire 101 to the cutting position, and then pushes the AgCu3 silver point 108 to the spot welding position. 18 Zn 20 The material strip 105 is transferred to the spot welding position. The lower electrode 103 corresponds to the position of the positioning plate 109, and the gear-shaped upper electrode 107 corresponds to the position of the support seat 110. The positioning plate 109 presses the lower electrode 103, and the connecting mechanism 106 drives the gear-shaped upper electrode 107 to press against the support seat 110, so that the AgCu3 silver spot 108 is aligned with the punched CuNi 18 Zn 20 The material strip 105 is in close contact.

[0062] The above is only a description of some preferred embodiments of the device described in the present invention. In other embodiments, the cutting mechanism, feeding mechanism, connecting mechanism, upper electrode, positioning component, supporting component, conveying mechanism, etc. can also adopt other structural forms and are not limited to the structures in the above embodiments and drawings of the present invention.

[0063] Based on the above device, the following provides a method for realizing AgCu3 / CuNi 18 Zn 20 The integrated punching and welding method of electric contacts has the following specific implementation process:

[0064] As shown in Figure 1, Figure 2 , CuNi 18 Zn 20 The material strip 105 is used as the punching object, and the AgCu3 silver wire 101 is used as the cutting object. 18 Zn 20 Strip 105, cut the AgCu3 silver wire 101, and then pre-punched CuNi 18 Zn 20 The material strip 105 and the cut AgCu3 silver dots 108 are transferred to the spot welding position to complete the spot welding.

[0065] Step 1: CuNi 18 Zn 20 The material strip 105 is punched into a desired shape, and the AgCu3 silver wire 101 is cut into AgCu3 silver dots 108;

[0066] The CuNi 18 Zn 20 The material strip 105 is punched into a desired shape, that is, the CuNi 18 Zn 20 The material strip 105 is transferred to the punching position of the punching mechanism 111 via rollers in the punching mechanism 111 , and the punching mechanism 111 punches the material strip 105 into a desired shape.

[0067] Cutting the AgCu3 silver wire 101 into the AgCu3 silver dots 108 means that the AgCu3 silver wire 101 is conveyed to the cutting position by the feeding mechanism 104 , and the cutting knife 102 cuts the AgCu3 silver wire 101 into the AgCu3 silver dots 108 .

[0068] Step 2: CuNi 18 Zn 20 The material strip 105 and the AgCu3 silver dot 108 are transferred to the spot welding position and the CuNi 18 Zn 20 Material strip 105 and AgCu3 silver dots 108.

[0069] The pre-punched CuNi 18 Zn 20 The material strip 105 is conveyed to the spot welding position by the roller in the stamping mechanism 111; the AgCu3 silver dots 108 are pushed to the spot welding position by the feeding mechanism 104;

[0070] The positioning plate 109 presses against the CuNi 18 Zn 20 Strip 105, making CuNi 18 Zn 20 The material strip 105 is close to the lower electrode 103;

[0071] The connecting mechanism 106 is connected to the gear-shaped upper electrode 107, and the connecting mechanism 106 drives the gear-shaped upper electrode 107 to press against the AgCu3 silver point 108 at the spot welding position, so that the AgCu3 silver point 108 and the CuNi 18 Zn 20 The material strip 105 is in close contact.

[0072] In the third step, the support seat 110, the positioning plate 109, the gear-shaped upper electrode 107, and the lower electrode 103 are arranged on the four sides of the stamped material strip, and the four sides are parallel to the conveying direction of the material strip; through the cooperation between the support seat 110, the positioning plate 109, the gear-shaped upper electrode 107, and the lower electrode 103, the electrical contact is in close contact with the stamped material strip, and the gear-shaped upper electrode 107 and the lower electrode 103 are energized to complete the spot welding action.

[0073] In this embodiment, the upper and lower electrodes are energized to complete the spot welding action, which means that the lower electrode 103 is used as the negative electrode of the external circuit, the gear-shaped upper electrode 107 is used as the positive electrode of the external circuit, and current is applied to both ends of the lower electrode 103 and the gear-shaped upper electrode 107 to complete the spot welding action, and finally a punching and welding integrated product is obtained. The actual product is shown in FIG. Figure 2 .

[0074] AgCu3 / CuNi processed by the method and device of the present invention 18 Zn 20 The electric contact assembly can weld 45 products per minute, and the minimum size of the weldable silver spot is close to 0.8mm, which significantly improves the product quality and has significant economic benefits.

[0075] It should be understood that the electrical contact shapes, electrode shapes and positions involved in the above embodiments can be adjusted within the scope of the present invention. This is easy to implement for those skilled in the art based on the description of the present invention, so it will not be repeated.

[0076] In the above description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0077] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, or direct application to other occasions without improvement, should be included in the protection scope of the present invention.

Claims

1. An integrated punching and welding device for electric contacts, characterized in that: include: Feeding mechanism, cutting mechanism, punching mechanism, conveying mechanism, supporting component, positioning component, upper electrode and lower electrode, wherein: The feeding mechanism is used to convey the silver wire to the cutting position; The cutting mechanism is used to cut the silver wires conveyed by the feeding mechanism into electrical contacts, and push the cut electrical contacts to the spot welding position through the feeding mechanism; The punching mechanism is located in the unwelded area of ​​the material strip and is used to punch the material strip into a desired shape; The conveying mechanism is used to convey the stamped material strip of the stamping mechanism to the spot welding position; The supporting component, the positioning component, the upper electrode and the lower electrode are located on four sides of the stamped material strip, and the four sides are parallel to the conveying direction of the material strip. Through the cooperation of the four components, the electric contact located at the spot welding position is in close contact with the stamped material strip, and the lower electrode and the upper electrode conduct current to complete spot welding; The device further comprises a connecting mechanism, the upper electrode is mounted on one end of the connecting mechanism, the connecting mechanism drives the upper electrode to press against the electric contact at the spot welding position, so that the electric contact is in close contact with the stamped material strip, and the working surface of the upper electrode is parallel to the surface to be welded of the electric contact; The upper electrode is a gear-type upper electrode, the upper electrode corresponds to the position of the supporting component, the lower electrode corresponds to the position of the positioning component, and the upper electrode is located above the lower electrode.

2. The integrated punching and welding device for electric contacts according to claim 1, characterized in that: A channel for conveying the silver wire is provided inside the feeding mechanism, and the channel is parallel to the surface to be welded of the electrical contact.

3. The integrated punching and welding device for electric contacts according to claim 2, characterized in that: The cutting mechanism adopts a cutting knife, and the cutting knife is perpendicular to the channel for conveying the silver wire in the feeding mechanism.

4. The integrated punching and welding device for electric contacts according to any one of claims 1 to 3, characterized in that: The conveying mechanism is composed of rollers, and the punched material strip is placed on the rollers and is transmitted to the spot welding position.

5. A method for punching and welding an integrated electric contact, using the punching and welding integrated electric contact device according to any one of claims 1 to 4, characterized in that: The steps include: In the first step, the strip is punched into the desired shape and the silver wire is cut into electrical contacts; Step 2: transport the stamped material strip and the electrical contact to the spot welding position, and fix the stamped material strip and the electrical contact; The third step is to arrange the supporting component, the positioning component, the upper electrode and the lower electrode on the four sides of the stamped material strip, and these four sides are parallel to the conveying direction of the material strip; through the cooperation between the supporting component, the positioning component, the upper electrode and the lower electrode, the electrical contact is in close contact with the stamped material strip, and the upper electrode and the lower electrode are energized to complete the spot welding action.

6. The method for integrated punching and welding of electric contacts according to claim 5, characterized in that: In the first step, one or more of the following characteristics are present: - The material strip is punched into the required shape means that: the material strip is conveyed by the conveying mechanism to the punching position of the punching mechanism, and the punching mechanism punches the material strip into the required shape; - The silver wire is cut into electrical contacts means that the silver wire is conveyed to the cutting position by the feeding mechanism, and the cutting knife cuts the silver wire into silver dots, i.e. electrical contacts.

7. The method for integrated punching and welding of electric contacts according to claim 5 or 6, characterized in that: Have one or more of the following characteristics: - The fixing of the material strip and the electrical contact means: the positioning component presses against the stamped material strip so that the stamped material strip is close to the lower electrode; the connecting mechanism connects the upper electrode, and the connecting mechanism drives the upper electrode to press against the electrical contact at the spot welding position so that the electrical contact is in close contact with the stamped material strip; - The energizing of the upper and lower electrodes means that the spot welding action is completed by loading current on both ends of the lower electrode and the upper electrode.

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