High efficiency parallel seam welding device
Patent Information
- Application Number
- CN202611302801.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-26
- Publication Date
- 2026-10-30
AI Technical Summary
[0003]此方式虽取放便捷，但由于产品加工时成本的控制，导致集成电路的外形尺寸公差范围较大（一般±0.2mm），在产品批次出现偏小公差时，产品在设备工装槽内的间隙较大，平行缝焊的原理是一种电阻焊工艺，通过两组圆锥型滚轮电极压紧在盖板边缘，脉冲电流从一侧电极流经盖板和管壳，再从另一侧电流回流形成闭合电路，电极与盖板接触时存在接触电阻，电流通过时产生焦耳热使局部温度快速升到焊料熔点以上从而形成焊点，为了使盖板和管壳完全焊在一起，电极轮需要压紧滚过盖板和管壳接触的四周
[0013]本发明的有益效果是：在保证了产品取放便捷性的情况下，通过随动轮辅助压紧产品，有效防止了产品起翘，从而极大地提高了产品封帽合格率。
Smart Images
Figure CN123000198A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of integrated circuit packaging, and in particular to the structure of parallel seam soldering production equipment. Background Technology
[0002] Most integrated circuits require parallel seam soldering during capping. Figure 1 The working principle of a parallel seam welding machine is illustrated. The parallel seam welding process requires a parallel seam welding machine. Because integrated circuit packaging has extremely high requirements for internal moisture content, the parallel seam welding machine must be a sealed environment. When performing parallel seam welding on products, the operator must use one hand to operate the mouse and keyboard, and the other hand to place and pick up the product using a special soft glove. Given the demanding operating environment and the need for convenient product handling, current parallel seam welding machines use tooling slots with sufficient margin to accommodate the product. During capping, the product is directly placed into the slot, and after capping, the product is removed from the slot.
[0003] While this method offers convenient handling, cost control during product processing results in a relatively large dimensional tolerance range for integrated circuits (typically ±0.2mm). When product batches exhibit smaller tolerances, the gaps between the products within the equipment tooling slots become larger. Parallel seam welding is a resistance welding process where two sets of conical roller electrodes are pressed against the edge of the cover plate. A pulsed current flows from one electrode through the cover plate and the casing, then flows back from the other side to form a closed circuit. When the electrodes contact the cover plate, there is contact resistance. As the current flows, Joule heat is generated, causing the local temperature to rise rapidly above the solder melting point, thus forming a solder joint. To ensure that the cover plate and the casing are completely welded together, the electrode rollers need to be pressed tightly and rolled around the contact area between the cover plate and the casing. Because of the large gap between the product and the tooling slot, when the electrode wheel rolls to the beginning and end of one side of the product, the excessive force on one side will cause the product to lift up. This is especially true for modular products, which are longer in shape. When the product is subjected to force at the edge, the lever arm is longer and the torque is greater, making the lifting up particularly obvious. This can cause abnormal contact between the electrode wheel and the product, resulting in sparking, or the ceramic colliding with the tooling when it lifts up, causing ceramic defects and making the product unusable.
[0004] To address this dilemma, one existing technology involves manually pressing the product down with tools during the capping process to prevent it from lifting. However, this significantly increases the workload and is prone to errors, such as missed pressure or ineffective pressure due to misalignment. Another existing technology uses fixtures to clamp the placed product to prevent it from lifting, but clamping reduces the process's capacity, and the operator only has one hand to place the product, making the operation difficult. Furthermore, clamping on a horizontal plane while lifting occurs on a vertical plane only reduces the probability of lifting, but cannot completely eliminate the defect rate. Neither of the existing technologies can completely solve this dilemma. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide an efficient parallel seam welding device to prevent products from warping and sparking during parallel seam welding, thereby improving the pass rate of product capping.
[0006] The technical solution adopted by the present invention to solve the aforementioned technical problem is a high-efficiency parallel seam welding device, including a product fixing fixture and an electrode wheel, wherein the electrode wheel is mounted on an electrode wheel fixing structure. The device is characterized in that an auxiliary pressure device is further provided on the electrode wheel fixing structure, wherein the auxiliary pressure device includes an auxiliary pressure application unit.
[0007] Furthermore, the auxiliary pressure device also includes a position adjustment unit and a position sensing control unit. The auxiliary pressure unit is mounted on the electrode wheel fixing structure through the position adjustment unit, and the position sensing control unit is connected to the position adjustment unit.
[0008] The working contact point of the auxiliary pressure device and the working contact point of the electrode wheel are on the same plane.
[0009] The auxiliary pressure device is a follower wheel, the axle of which is parallel to the axle of the electrode wheel. The follower wheel and the electrode wheel have the same shape and size.
[0010] Preferably, each electrode wheel is equipped with at least two follower wheels, and the electrode wheel is positioned between the two follower wheels.
[0011] The auxiliary pressure device is a caster wheel or a ball joint.
[0012] Furthermore, the position sensing control unit is an electrode wheel current detection circuit.
[0013] The beneficial effects of this invention are: while ensuring the convenience of product handling, the product is effectively prevented from tilting by using a follower wheel to assist in pressing the product, thereby greatly improving the product capping qualification rate.
[0014] During welding, the product pressure is balanced by the electrode wheel and the follower wheel to prevent the product from lifting, which greatly improves the pass rate of parallel seam welding.
[0015] The electrode wheel and the follower wheel are integrated into one unit, which has high positioning accuracy and a precise and compact structure, eliminating the need for an additional power mechanism.
[0016] The loading and unloading operation is convenient, with minimal human intervention, no additional actions required, and guaranteed production capacity.
[0017] The follower wheel rotates using dual bearings, providing sufficient pressure when rolling on the product, but with minimal friction. This hardly affects the load on the original electrode wheel's motor and does not cause friction damage to the product itself, resulting in excellent safety performance. Attached Figure Description
[0018] Figure 1This is a schematic diagram of existing technology.
[0019] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention.
[0020] Figure 3 This is a schematic diagram of the principle of Embodiment 2 of the present invention.
[0021] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention. Detailed Implementation
[0022] Explanation of markings in the diagram:
[0023] 1. Electrode wheel shaft, 2. Wheel shaft fixing block, 3. Electrode wheel, 4. Product fixing fixture, 5. Product (chip to be packaged), 6. Bearing, 7. Follower wheel shaft, 8. Follower wheel shaft fixing nut, 9. First follower wheel, 10. Second follower wheel, 20. Electrode wheel mounting bracket, 21. First follower wheel mounting bracket, 22. Second follower wheel mounting bracket, 23. Second follower wheel shaft fixing nut, 24. Spring, 25. Second follower wheel shaft, 26. Deep groove ball bearing, 27. Rotating shaft, 28. Electromagnet.
[0024] Example 1
[0025] See Figure 2 In this embodiment, follower wheels are provided on both sides of the electrode wheel. The follower wheels serve as auxiliary pressure devices and also as auxiliary pressure application units.
[0026] This embodiment includes an electrode wheel shaft 1, a wheel shaft fixing block 2, an electrode wheel 3, a product fixing fixture 4, a product 5, a bearing 6, a follower wheel shaft 7, a follower wheel shaft fixing nut 8, a first follower wheel 9, and a second follower wheel 10.
[0027] The wheel axle fixing block 2 serves as the electrode wheel fixing structure, and an auxiliary pressure unit (first follower wheel 9 and second follower wheel 10) is installed on it.
[0028] The working contact point of the auxiliary pressure device and the working contact point of the electrode wheel are on the same plane. The working contact point refers to the point of contact with the product during operation, which is the lowest position of the follower wheel and the electrode wheel.
[0029] The auxiliary pressure device is a follower wheel, the axle of which is parallel to the axle of the electrode wheel. The follower wheel and the electrode wheel have the same shape and size.
[0030] Preferably, each electrode wheel is equipped with at least two follower wheels, and the electrode wheel is positioned between the two follower wheels.
[0031] The auxiliary pressure device can also be made of casters or ball joints, which is obvious to ordinary technicians.
[0032] Working status description:
[0033] When the electrode wheel presses against the beginning and end of the product, the same pressure is applied to other parts of the product at the same time to balance the force points when sealing the cap and prevent the product edge from being stressed at a single point and causing it to lift up and spark.
[0034] Two follower wheels are configured on each side of the original two electrode wheels. When the motor controls the movement of the electrode wheels, the follower wheels and the electrode wheels move synchronously as a whole.
[0035] During parallel seam welding, the first follower wheel contacts the product first. Made of insulating plastic, the follower wheel does not generate current or form a circuit upon contact. Therefore, when the first follower wheel presses against the beginning of the product, welding has not yet begun, and any product lifting at this point is unlikely to cause adverse consequences. Furthermore, the follower wheel is fixed by double-sided bearings, resulting in low friction as it rolls over the product, barely affecting the original motor load and causing no damage to the product itself. When the first follower wheel rolls away from the beginning of the product, the product has returned to a horizontal state. At this point, the electrode wheel rolls to contact and press against the beginning of the product. However, because the pressure from both the electrode wheel and the first follower wheel is balanced, lifting will not occur. The electrode wheel itself is made of tungsten copper with excellent conductivity, and welding begins upon contact with the product.
[0036] After the electrode wheel leaves the beginning of the product, the second follower wheel begins to press the beginning of the product. At this time, the product is pressed down by the electrode wheel (the first follower wheel has already left the product), and it will not lift up. When the electrode wheel rolls to the end of the product, the product is still pressed down by the electrode wheel and the second follower wheel. The force is balanced and it will not lift up. When the electrode wheel leaves the product, the welding is completed, and the probability of the product lifting up is extremely low.
[0037] This embodiment shows a method of "one electrode wheel configured with two follower wheels". Obviously, more follower wheels can also be configured for one electrode wheel, with follower wheels at both the front and rear of the electrode wheel.
[0038] In practice, this can be simplified to simply placing a follower wheel in front of the electrode wheel. "In front" refers to the direction of relative movement between the electrode wheel and the product, where the follower wheel contacts the product earlier. This method only addresses the issue of warping before welding, which is also the most probable type of warping.
[0039] Example 2
[0040] The difference between this embodiment and Embodiment 1 is that the follower wheel is installed on the electrode wheel fixing structure through the position adjustment unit, and the position sensing control unit is connected to the position adjustment unit, thereby realizing that the follower wheel can be raised and lowered.
[0041] See Figure 3The arrows indicate the direction of relative movement between the electrode wheel and the product. Initially, the first follower wheel in front of the electrode wheel is higher than the electrode wheel; the first follower wheel is not in contact with the product before the product contacts the electrode wheel. Figure 3 State A). When the electrode wheel contacts the product, current (called welding current) flows through the electrode wheel. When the position sensing control unit detects the welding current, it controls the first follower wheel to press down, applying pressure to the product. Figure 3 State B), thereby controlling the product to prevent it from warping during welding. When the welding current disappears (the product loses contact with the electrode wheel), the position sensing control unit controls the second follower wheel behind the electrode wheel to rise. At this time, the second follower wheel is not at the edge of the product ( Figure 3 In state D), lifting will not cause warping, thus more effectively solving the warping problem.
[0042] The position adjustment unit can be implemented using a combination of a limit groove, an electromagnet, and a spring. See [link / reference]. Figure 4 The invention is readily implemented by those skilled in the art, as described in the specification and accompanying drawings, and will not be elaborated further.
[0043] Example 3
[0044] Example 2 uses welding current detection to sense the product position. This example employs video sensing technology, using a camera to capture the product position. When the product is about to contact the electrode wheel, the first follower wheel is lowered to hold the product in place; when the product loses contact with the electrode wheel, the second follower wheel that holds the product in place is immediately raised. Referring to the description of this invention, this example is easily implemented by those skilled in the art, and its details will not be elaborated further.
Claims
1. A high-efficiency parallel seam welding device, comprising a product fixing fixture and an electrode wheel, wherein the electrode wheel is mounted on an electrode wheel fixing structure, characterized in that, An auxiliary pressure device is also provided on the electrode wheel fixing structure, and the auxiliary pressure device includes an auxiliary pressure application unit.
2. The high-efficiency parallel seam welding device as described in claim 1, characterized in that, The auxiliary pressure device also includes a position adjustment unit and a position sensing control unit. The auxiliary pressure unit is mounted on the electrode wheel fixing structure through the position adjustment unit, and the position sensing control unit is connected to the position adjustment unit.
3. The high-efficiency parallel seam welding device as described in claim 1 or 2, characterized in that, The working contact point of the auxiliary pressure device and the working contact point of the electrode wheel are on the same plane.
4. The high-efficiency parallel seam welding device as described in claim 3, characterized in that, The auxiliary pressure device is a follower wheel, and the axle of the follower wheel is parallel to the axle of the electrode wheel.
5. The high-efficiency parallel seam welding device as described in claim 4, characterized in that, The follower wheel has the same shape and size as the electrode wheel.
6. The high-efficiency parallel seam welding device as described in claim 4, characterized in that, Each electrode wheel is equipped with at least two follower wheels, with the electrode wheel positioned between the two follower wheels.
7. The high-efficiency parallel seam welding device as described in claim 3, characterized in that, The auxiliary pressure device is a caster wheel or a ball joint.
8. The high-efficiency parallel seam welding device as described in claim 2, characterized in that, The position sensing control unit is an electrode wheel current detection circuit.