High-precision resistance welding machine

Abstract

The invention discloses a high-precision resistance welding machine. The high-precision resistance welding machine comprises a rack; an upper electrode and a lower electrode are arranged on the rack, and the rack comprises an upper mounting assembly, a lower mounting assembly and a jig assembly; the upper installation assembly comprises an upper connecting arm connected to the rack, an upper air cylinder installed on the upper connecting arm and an upper platen base installed at the telescopic end of the upper air cylinder. The upper electrode is fixed to the upper platen seat; the rack is further provided with an upper elastic frame. The end part of the upper elastic frame is provided with an upper bedplate which is attached to the upper bedplate seat so as to rebound and limit the vertical position of the upper electrode; the lower installation assembly comprises a lower connecting arm connected to the rack, a lower air cylinder installed on the rack and a lower platen base installed at the telescopic end of the lower air cylinder. The lower electrode is fixed to the lower platen seat; the rack is further provided with a lower elastic frame. A lower platen which is attached to the lower platen base and used for limiting the vertical position of the lower electrode in a rebounding mode is arranged at the end of the lower elastic frame. The high-precision resistance welding machine can effectively improve the welding precision and the welding efficiency of the soft copper bar and the hard copper bar.

Description

Technical Field

[0001] The invention relates to a high-precision resistance welding machine. Background Art

[0002] Resistance welding refers to the process of passing an electric current through a weldment, using the heat generated by the resistance of the weld zone to heat the metal in the weld zone to a partially molten or high-temperature plastic state, and forming a strong joint under the forging and pressing of an external force. A traditional resistance welding machine is equipped with two electrodes. After the hard copper bar and the soft copper bar are stacked and placed using a jig, the jig is manually taken to the resistance welding machine so that the welding position of the hard copper bar and the soft copper bar is located between the two electrodes. The two electrodes are then driven up and down to squeeze the upper and lower sides of the welding position of the hard copper bar and the soft copper bar. At the same time, the two electrodes are controlled to be energized to heat up the welding position of the hard copper bar and the soft copper bar until they are melted and connected. After extrusion and welding, the jig is removed and the welded part is taken out after cooling.

[0003] When the above-mentioned resistance welding machine welds the hard copper busbar and the soft copper busbar, it is necessary to manually hold the jig for welding operation, which may easily cause the welding to move, affecting the accuracy of the welding position and the firmness of the welding. In addition, the hard copper busbar needs to be cut before welding and connecting, and the overall welding efficiency and welding accuracy are low. Summary of the invention

[0004] The present invention provides a high-precision resistance welding machine to solve the above-mentioned technical problems, and specifically adopts the following technical solutions:

[0005] A high-precision resistance welding machine comprises: a frame; an upper electrode and a lower electrode for pressure welding a workpiece to be welded are arranged on the frame, and a transformer for providing corresponding power to the upper motor and the lower electrode; the frame comprises: an upper mounting assembly for mounting the upper electrode, a lower mounting assembly for mounting the lower electrode, and a jig assembly for mounting the workpiece to be welded; the upper mounting assembly comprises: an upper connecting arm connected to the frame, an upper cylinder mounted on the upper connecting arm, and an upper platen seat mounted on the telescopic end of the upper cylinder; the upper electrode is fixed to the upper platen seat; the frame is also provided with an upper elastic frame; the end of the upper elastic frame is provided with a spring for fitting the upper platen seat An upper platen for limiting the vertical position of the upper electrode by rebound; a first pressure sensor for detecting the vertical pressure of the electrode plate on the workpiece to be welded is provided between the upper platen and the upper platen seat; a lower mounting assembly comprises: a lower connecting arm connected to a frame, a lower cylinder installed on the frame, and a lower platen seat installed on the telescopic end of the lower cylinder; the lower electrode is fixed to the lower platen seat; the frame is also provided with a lower elastic frame; a lower platen is provided at the end of the lower elastic frame, which fits the lower platen seat for rebound limiting the vertical position of the lower electrode; a second pressure sensor for detecting the vertical pressure of the electrode plate on the workpiece to be welded is provided between the lower platen and the lower platen seat.

[0006] Furthermore, the jig assembly includes: a limiting plate for limiting the placement of the workpiece to be welded; one end of the limiting plate is mounted on the frame, and is formed with a first limiting groove for limiting the placement of the soft copper bar of the workpiece to be welded and a second limiting groove for placing the hard copper bar of the workpiece to be welded;

[0007] The overlapping position of the first limiting groove and the second limiting groove is the welding position of the workpiece to be welded; the upper and lower sides of the overlapping position are aligned with the upper electrode and the lower electrode respectively.

[0008] Furthermore, the limit plate is a hollow structure with a cooling circuit for circulating the cooling medium inside; inside the frame, an injection pump for injecting the cooling medium into the cooling circuit and a discharge pump for discharging the cooling medium in the cooling circuit are respectively provided at both ends of the cooling circuit.

[0009] Furthermore, the limiting plate is made of ceramic material.

[0010] Furthermore, an upper laser engraver for engraving patterns on the welding positions of the hard copper busbars is provided on the lower side of the upper platen; and a lower laser engraver for engraving patterns on the welding positions of the soft copper busbars is provided on the upper side of the lower platen.

[0011] Further, the upper laser engraver and the lower laser engraver have different engraving depths in the engraving direction.

[0012] Furthermore, the engraving lines of the upper laser engraver are arranged adjacent to the engraving lines of the lower laser engraver, and the engraving shapes of the upper laser engraver and the lower laser engraver are both in a closed shape connected end to end.

[0013] Furthermore, a clamp for clamping the soft copper busbar is provided at the end of the limiting plate; the clamp comprises: two clamps; one of the two clamps is fixed to the limiting plate; the other of the two clamps is slidably connected to the limiting plate; a micro cylinder is installed on the limiting plate for pushing the clamp slidably connected to the limiting plate.

[0014] Furthermore, a laser cutter for cutting the hard copper bar is slidably provided on the lower side of the upper platen; a pushing cylinder for pushing the laser cutter to move is also installed on the lower side of the upper platen; and a limiting socket is formed on the frame for inserting the hard copper bar into the second limiting groove.

[0015] Furthermore, the welding area of ​​the upper electrode and the lower electrode to the workpiece is 8.0 mm long and 6.0 mm wide; the welding current of the upper electrode and the lower electrode is 14A, the welding time is 200MS, the welding pressure is 80KG, and the number of welding pulses is 4 times.

[0016] The invention is beneficial in that the high-precision resistance welding machine provided can improve the welding precision of soft copper bars and hard copper bars, ensure the welding quality, and thus improve the product quality of the welding products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 is a schematic diagram of a high-precision resistance welding machine of the present invention;

[0019] Figure 2 yes Figure 1 Schematic diagram of the limit plate of the high-precision resistance welding machine;

[0020] Figure 3 yes Figure 1 A partially enlarged schematic diagram of a high-precision resistance welding machine.

[0021] High-precision resistance welding machine 10, frame 11, upper electrode 12, lower electrode 13, transformer 14, upper mounting assembly 15, upper connecting arm 151, upper cylinder 152, upper table seat 153, upper elastic frame 154, upper table 155, first pressure sensor 156, lower mounting assembly 16, lower connecting arm 161, lower cylinder 162, lower table seat 163, lower elastic frame 164, second pressure sensor 165, lower table 166, limit plate 17, first limit groove 171, second limit groove 172, cooling circuit 173, injection pump discharge pump, upper laser engraver 18, lower laser engraver 19, clamp 20, micro cylinder 21, laser cutter 22, push cylinder 23. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0023] like Figures 1 to 3 As shown, a high-precision resistance welding machine 10 of the present application includes: a frame 11, an upper electrode 12 and a lower electrode 13 are provided on the frame 11, and a transformer 14 for providing corresponding power to the upper motor and the lower electrode 13. The upper electrode 12 and the lower electrode 13 can energize the soft copper bar and the hard copper bar, so that the soft copper bar and the hard copper bar are melted at high temperature, thereby achieving a fusion connection. The transformer 14 can provide power supplies of different voltages to the upper electrode 12 and the lower electrode 13, thereby controlling the current of the upper electrode 12 and the lower electrode 13, and then controlling the melting temperature of the soft copper bar and the hard copper bar.

[0024] Furthermore, the frame 11 includes: an upper mounting assembly 15, a lower mounting assembly 16 and a jig assembly, the upper mounting assembly 15 is used to install the upper electrode 12, the lower mounting assembly 16 is used to install the lower electrode 13, and the jig assembly is used to install the parts to be welded, that is, to limit the position of the soft copper bar and the hard copper bar to limit the welding position of the soft copper bar and the hard copper bar.

[0025] The upper mounting assembly 15 includes: an upper connecting arm 151 connected to the frame 11, an upper cylinder 152 mounted on the upper connecting arm 151, and an upper platen seat 153 mounted on the telescopic end of the upper cylinder 152, and the upper electrode 12 is fixed to the upper platen seat 153. The frame 11 is also provided with an upper elastic frame 154, and an upper platen 155 is provided at the end of the upper elastic frame 154 for fitting the upper platen seat 153, so as to rebound and limit the vertical position of the upper electrode 12 when the upper electrode 12 moves downward. A first pressure sensor 156 is provided between the upper platen 155 and the upper platen seat 153, and the vertical pressure of the electrode plate on the workpiece to be welded can be detected by the first pressure sensor 156. The lower mounting assembly 16 comprises: a lower connecting arm 161 connected to the frame 11, a lower cylinder 162 mounted on the frame 11, and a lower platen seat 163 mounted on the telescopic end of the lower cylinder 162, and the lower electrode 13 is fixed to the lower platen seat 163. The frame 11 is also provided with a lower elastic frame 164, and a lower platen 166 is provided at the end of the lower elastic frame 164, and the lower platen 166 is attached to the lower platen seat 163 for rebounding and limiting the vertical position of the lower electrode 13. A second pressure sensor 165 is provided between the lower platen 166 and the lower platen seat 163, and the second pressure sensor 165 can detect the vertical pressure of the electrode plate on the workpiece to be welded.

[0026] The above-mentioned jig assembly includes: a limit plate 17, one end of which is mounted on the frame 11, and is formed with a first limit groove 171 for limiting the placement of the soft copper bar of the workpiece to be welded and a second limit groove 172 for placing the hard copper bar of the workpiece to be welded. That is, during welding, the soft copper bar of the workpiece to be welded is placed in the first limit groove 171, and the hard copper bar of the workpiece to be welded is placed in the second limit groove 172. The overlapping position of the first limit groove 171 and the second limit groove 172 is the welding position of the workpiece to be welded, and the upper and lower sides of the overlapping position are aligned with the upper electrode 12 and the lower electrode 13 respectively, so that the upper and lower sides of the welding position of the workpiece to be welded are aligned with the upper electrode 12 and the lower electrode 13 respectively.

[0027] During operation, the upper cylinder 152 drives the upper electrode 12 to move downward, and the lower cylinder 162 drives the lower electrode 13 to move upward until the upper electrode 12 contacts the top of the soft copper bar and the lower electrode 13 contacts the bottom of the hard copper bar. The upper cylinder 152 drives the upper electrode 12 and the lower electrode 13 to squeeze the upper side of the soft copper bar respectively to apply a preset pressure to the soft copper bar, and the lower cylinder 162 drives the lower electrode 13 to squeeze the lower side of the hard copper bar to apply a preset pressure to the hard copper bar. At the same time, the upper electrode 12 and the lower electrode 13 conduct and melt the soft copper bar and the hard copper bar. In this way, the molten parts of the soft copper bar and the hard copper bar are fused and connected under pressure to achieve welding. The pressure value of the soft copper bar and the hard copper bar can be detected and fed back by the first pressure sensor 156 and the second pressure sensor 165. If the pressure value of the soft copper bar and the hard copper bar is too large, the molten material will overflow, affecting the uniformity of welding and causing some parts to be too thin. If the pressure value of the soft copper bar and the hard copper bar is too small, the molten material will not be fully blended, thus affecting the welding strength. The specific pressure of the soft copper bar and the hard copper bar can be set according to the soft copper bar and the hard copper bar of different properties. In other words, according to the soft copper bar and the hard copper bar of different thicknesses, different densities, and different additives, different current intensity thresholds can be set for the upper electrode 12 and the lower electrode 13, and different detection value thresholds can be set for the first pressure sensor 156 and the second pressure sensor 165, so as to ensure the welding accuracy and welding strength of the soft copper bar and the hard copper bar of different properties, and improve the quality of the overall welding product.

[0028] The upper electrode 12 and the lower electrode 13 of this solution have a welding area of ​​8.0 mm long and 6.0 mm wide for the workpiece to be welded; the welding current of the upper electrode 12 and the lower electrode 13 is 14 A, the welding time is 200 MS, the welding pressure is 80 KG, and the number of welding pulses is 4 times. The welding structure of this solution combined with such parameter settings can effectively improve the welding accuracy of soft copper bars and hard copper bars, thereby improving the firmness of the welding position. In other words, the high-precision resistance welding machine 10 of this application can improve the welding accuracy of soft copper bars and hard copper bars, ensure the welding quality, and thus improve the product quality of the welded product.

[0029] As a specific implementation, the limit plate 17 is a hollow structure with a cooling circuit 173 for circulating a cooling medium inside. In the frame 11, an injection pump and a discharge pump are respectively provided at both ends of the cooling circuit 173. The injection pump is used to inject cooling medium into the cooling circuit 173 when cooling is required after the welding operation is completed to cool the welding position. The discharge pump is used to discharge the cooling medium in the cooling circuit 173 before the welding operation to ensure the accuracy of the welding temperature generated by the output current and the melting welding. Here, the limit plate 17 is made of ceramic material, which is resistant to high temperature, has high structural strength, and is not easy to deform, so as to ensure the support stability of the workpiece to be welded. At the same time, ceramics have a certain thermal conductivity, and the thermal conductivity effect is relatively gentle, which can transfer the heat of the welding position of the workpiece to be welded to the cooling medium, so as to cool the workpiece to be welded steadily, avoiding the situation where the welding position is cooled sharply due to the sharp cooling and cracks are generated, or the local cooling is too fast and easy to break.

[0030] As a specific implementation, a clamp is provided at the end of the limit plate 17 for clamping the soft copper busbar. The clamp includes: two clamps 20, one of the two clamps 20 is fixed to the limit plate 17, the other of the two clamps 20 is slidably connected to the limit plate 17, and a micro cylinder 21 is installed on the limit plate 17, and the clamp 20 slidably connected to the limit plate 17 is pushed by the micro cylinder 21, so as to achieve stable clamping.

[0031] As a specific implementation, an upper laser engraver 18 is provided on the lower side of the upper platen 155 for engraving the pattern of the welding position of the hard copper busbar, and a lower laser engraver 19 is provided on the upper side of the lower platen 166 for engraving the pattern of the welding position of the soft copper busbar. In this way, the upper laser engraver 18 and the lower laser engraver 19 respectively engrave the pattern at the lower welding position of the soft copper busbar and the upper welding position of the hard copper busbar, and such pattern can contain the molten material when the welding melts, thereby improving the tensile resistance of the welding position and having a higher structural strength.

[0032] Furthermore, the upper laser engraver 18 and the lower laser engraver 19 have different engraving depths in the engraving direction. The engraving lines of the upper laser engraver 18 and the engraving lines of the lower laser engraver 19 are arranged adjacent to each other, and the engraving shapes of the upper laser engraver 18 and the lower laser engraver 19 are both in a closed shape connected end to end. This can improve the tensile strength of the welding position and the torsion resistance of the welding position, and the overall welding fusion is higher.

[0033] Optionally, the engraving shapes of the upper laser engraver 18 and the lower laser engraver 19 are closed circles.

[0034] As a specific implementation, a laser cutter 22 is slidably provided on the lower side of the upper platen 155 for cutting the hard copper bar, and the frame 11 forms a limited position insertion hole for inserting the hard copper bar into the second limit groove 172, and then the laser cutter 22 cuts the specified position of the hard copper bar, which can effectively improve the welding connection efficiency of the soft and hard copper bars. A push cylinder 23 is also installed on the lower side of the upper platen 155, and the push cylinder 23 can push the laser cutter 22 to move, so that hard copper bars of different lengths can be cut, thereby improving the practicality of the machine.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A high-precision resistance welding machine, comprising: frame; The frame is provided with an upper electrode and a lower electrode for pressure welding the workpiece to be welded, and a transformer for providing corresponding power to the upper motor and the lower electrode; it is characterized in that: The frame comprises: an upper mounting assembly for mounting the upper electrode, a lower mounting assembly for mounting the lower electrode, and a jig assembly for mounting a workpiece to be welded; The upper mounting assembly comprises: an upper connecting arm connected to the frame, an upper cylinder mounted on the upper connecting arm, and an upper platform seat mounted on the telescopic end of the upper cylinder; The upper electrode is fixed to the upper stage seat; The frame is also provided with an upper elastic frame; An upper platen is provided at the end of the upper elastic frame for abutting against the upper platen seat to rebound and limit the vertical position of the upper electrode; A first pressure sensor for detecting the vertical pressure of the electrode plate on the workpiece to be welded is provided between the upper plate and the upper plate seat; The lower mounting assembly includes: a lower connecting arm connected to the frame, a lower cylinder mounted on the frame, and a lower platform seat mounted on the telescopic end of the lower cylinder; The lower electrode is fixed to the lower stage seat; The frame is also provided with a lower elastic frame; The end of the lower elastic frame is provided with a lower platen which fits the lower platen seat and is used for rebounding and limiting the vertical position of the lower electrode; A second pressure sensor for detecting the vertical pressure of the electrode plate on the workpiece to be welded is provided between the lower platen and the lower platen seat.

2. The high-precision resistance welding machine according to claim 1, characterized in that: The jig assembly comprises: a limiting plate for limiting the position of the workpiece to be welded; One end of the limiting plate is mounted on the frame and is formed with a first limiting groove for limiting the soft copper bar of the welded part and a second limiting groove for placing the hard copper bar of the welded part; The overlapping position of the first limiting groove and the second limiting groove is the welding position of the workpiece to be welded; The upper and lower sides of the overlapping position are aligned with the upper electrode and the lower electrode, respectively.

3. The high-precision resistance welding machine according to claim 2, characterized in that: The limit plate is a hollow structure with a cooling circuit for circulating the cooling medium inside; In the frame, an injection pump for injecting a cooling medium into the cooling circuit and a discharge pump for discharging the cooling medium in the cooling circuit are respectively provided at both ends of the cooling circuit.

4. The high-precision resistance welding machine according to claim 3, characterized in that: The limiting plate is made of ceramic material.

5. The high-precision resistance welding machine according to claim 1, characterized in that: An upper laser engraver for engraving patterns on the welding positions of the hard copper bars is provided on the lower side of the upper platen; A lower laser engraver for engraving patterns on the welding positions of the soft copper busbars is arranged on the upper side of the lower platform.

6. The high-precision resistance welding machine according to claim 5, characterized in that: The upper laser engraver and the lower laser engraver have different engraving depths in the engraving direction.

7. The high-precision resistance welding machine according to claim 5, characterized in that: The engraving lines of the upper laser engraver are arranged adjacent to the engraving lines of the lower laser engraver, and the engraving shapes of the upper laser engraver and the lower laser engraver are both in a closed shape connected end to end.

8. The high-precision resistance welding machine according to claim 2, characterized in that: The end of the limit plate is provided with a clamp for clamping the soft copper busbar; The clamp comprises: two clamping plates; One of the two clamping plates is fixed to the limiting plate; The other of the two clamping plates is slidably connected to the limiting plate; The limiting plate is provided with a micro cylinder for pushing the clamping plate which is slidably connected to the limiting plate.

9. The high-precision resistance welding machine according to claim 2, characterized in that: A laser cutter for cutting hard copper bars is slidably provided on the lower side of the upper platen; A pushing cylinder for pushing the laser cutter to move is also installed on the lower side of the upper platform; The frame is formed with a limiting plug hole for inserting the hard copper busbar into the second limiting groove.

10. The high-precision resistance welding machine according to claim 1, characterized in that: The welding area of ​​the upper electrode and the lower electrode to the workpiece is 8.0 mm long and 6.0 mm wide; The welding current of the upper electrode and the lower electrode is 14A, the welding time is 200MS, the welding pressure is 80KG, and the number of welding pulses is 4 times.

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