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CN-224209967-U - Cutting jig and cutting equipment for welding test of power device packaging unit

CN224209967UCN 224209967 UCN224209967 UCN 224209967UCN-224209967-U

Abstract

The utility model discloses a cutting jig and cutting equipment for welding test of a power device packaging unit, wherein the cutting jig comprises a bearing assembly, a lower die assembly, an upper die assembly and a guide assembly, the lower die assembly comprises a lower die main body, a first bearing part and a second bearing part for bearing connecting sheets are arranged on the upper surface of the lower die main body, a cutting groove is formed in a cutting area corresponding to the power device packaging unit, the upper die assembly comprises an upper die connecting plate, a feed channel penetrating through an abutting surface is formed in a stripper plate, and a cutter positioned in the feed channel is mounted on the upper die connecting plate. The scheme avoids the offset of the connecting sheet and the welding position in the power device packaging unit in the cutting process, so that the flatness of the section between the connecting sheet and each component after cutting is ensured, layering does not occur at the joint, and more accurate and real test objects can be provided for the subsequent joint test of each part.

Inventors

  • ZHU LEI
  • HAO YANXIA
  • CHEN HUIYU
  • ZHU JIANPING

Assignees

  • 苏州固锝电子股份有限公司

Dates

Publication Date
20260508
Application Date
20250515

Claims (10)

  1. 1. Cutting jig for welding test of power device packaging unit is used for cutting operation of power device packaging unit welding test, and power device packaging unit (9) contains chip (91) and connection piece (92), and chip (91) and connection piece (92) welded fastening, the junction of chip (91) and connection piece (92) has cutting region (90), its characterized in that: The cutting jig comprises a bearing component (1), a lower die component (2), an upper die component (3) and a guide component (4); The bearing assembly (1) comprises a bottom plate (11) and a lower die fixing plate (12), and the lower die fixing plate (12) is arranged on the upper surface of the bottom plate (11); the lower die assembly (2) is arranged on the lower die fixing plate (12), the lower die assembly (2) comprises a lower die main body (21), a first bearing part (22) and a second bearing part (23) for bearing a connecting sheet (92) are arranged on the upper surface of the lower die main body (21), and a cutting groove (24) is formed in the lower die main body (21) between the first bearing part (22) and the second bearing part (23) and corresponds to a cutting area (90) of the power device packaging unit; The upper die assembly (3) is arranged above the lower die assembly (2) through the guide assembly (4), the upper die assembly (3) comprises an upper die connecting plate (31), a stripper plate (32) capable of floating up and down is connected to the upper die connecting plate (31), an elastic piece (34) is arranged between the upper die connecting plate (31) and the stripper plate (32), a downward-oriented abutting surface (321) is arranged on the stripper plate (32) corresponding to the first bearing part (22) and the second bearing part (23), a feed channel (322) penetrating the abutting surface (321) is arranged on the stripper plate (32), a cutter (33) located in the feed channel (322) is arranged on the upper die connecting plate (31), and a cutting groove (24) of the lower die main body (21) is located on a displacement path of the cutter (33).
  2. 2. The cutting jig for welding test of power device packaging unit according to claim 1, wherein the cutting jig is configured to have an initial state, a press-fit state, a cutting state and a discharge state; In an initial state, the stripper plate (32) has a downward displacement trend under the action of the elastic piece (34) and self gravity, the lower end of the cutter (33) is positioned in the feed channel (322) and at an upward position of the abutting surface (321), and the abutting surface (321) is positioned at a position far away from the first bearing part (22) and the second bearing part (23); In the pressing state, the upper die assembly (3) is wholly downwards displaced under the action of external driving, the stripper plate (32) is close to and abutted against the power device packaging units positioned on the first bearing part (22) and the second bearing part (23), the elastic piece (34) is compressed, the cutter (33) is downwards displaced from the feed channel (322) and is close to the cutting area (90) of the power device packaging unit, and the lower end of the cutter (33) is positioned in the feed channel (322) and is close to or flush with the surface of the abutting surface (321); In a cutting state, the upper die assembly (3) continues to downwards displace under the action of external driving, the lower end of the cutter (33) penetrates through the cutter channel (322) to apply cutting force to the cutting area (90) of the power device packaging unit, and the lower end of the cutter (33) cuts off the cutting area (90) of the connecting sheet (92) and then enters the cutting groove (24); In the unloading state, in the upward displacement process of the upper die assembly (3), the unloading plate (32) continuously presses the power device packaging unit under the condition that the elastic piece (34) releases compression elastic force, the lower end of the cutter (33) is upwards displaced to be separated from the cutting groove (24) and enter the feed channel (322), and the unloading plate (32) is separated from the power device packaging unit.
  3. 3. The cutting jig for welding test of power device packaging unit according to claim 1, wherein the lower die fixing plate (12) is provided with a mounting groove (121), the lower die main body (21) is positioned and mounted in the mounting groove (121), and the lower die fixing plate (12) is provided with a discharge groove (122) communicated with the cutting groove (24) and located right below the cutting groove (24).
  4. 4. The cutting jig for welding test of power device packaging unit according to claim 3, wherein two supporting plates (13) are installed on the upper surface of the bottom plate (11), the supporting plates (13) are located on two sides of the lower die fixing plate (12) and the lower die main body (21), and the two supporting plates (13) are located on two sides of the lower die main body (21) in the installation groove (121).
  5. 5. The cutting jig for welding test of power device packaging unit according to claim 3, wherein the bottom plate (11) is provided with a discharge chute (111) for discharging waste, and the discharge chute (111) is communicated with the discharge chute (122) and the cutting chute (24).
  6. 6. The cutting jig for welding test of power device packaging units according to claim 1, wherein the upper die assembly (3) further comprises an upper die fixing plate (35), and the lower part of the upper die fixing plate (35) is fixedly connected with the upper die connecting plate (31).
  7. 7. The cutting jig for welding test of power device packaging units according to claim 6, wherein the guide assembly (4) comprises a guide post (41) and a guide sleeve (42), the guide sleeve (42) is fixedly arranged on the upper die fixing plate (35), the lower end of the guide post (41) is fixed on the bottom plate (11), and the upper end of the guide post (41) passes through the upper die fixing plate (35) and the guide sleeve (42) and then is guided to act on the upper die assembly (3).
  8. 8. The cutting jig for welding test of power device packaging units according to claim 1, wherein the abutting surface (321) is a hollowed-out rectangular plane with a feed channel (322) in the middle, and the abutting surface (321) is in a shape of a Chinese character 'hui'.
  9. 9. Cutting equipment for welding test of power device packaging units is characterized by comprising a machine table (5), a cutting driving assembly (6) and the cutting jig according to any one of claims 1 to 8, wherein the cutting driving assembly (6) is one of a manual pressing assembly, a pneumatic pressing assembly, a hydraulic pressing assembly or an electric pressing assembly.
  10. 10. The cutting device for the welding test of the power device packaging unit according to claim 9, wherein the cutting driving assembly (6) is a manual pressing assembly, the cutting driving assembly (6) comprises a driving handle (61) and a pressing cylinder (62), and the output end of the lower part of the pressing cylinder (62) is fixedly connected with the upper die assembly (3).

Description

Cutting jig and cutting equipment for welding test of power device packaging unit Technical Field The utility model relates to the technical field of semiconductor packaging test, in particular to a cutting jig and cutting equipment for welding test of a power device packaging unit. Background A power device MOSFET (metal-oxide semiconductor field effect transistor) belongs to the technical field of semiconductors, and a chip thereof is a core component of a semiconductor device and is manufactured based on materials such as silicon (Si), silicon carbide (SiC) or gallium nitride (GaN). The high-efficiency power conversion and control method is focused on efficient power conversion and control, relates to power switching and adjustment under high-voltage and high-current scenes, and is mainly applied to multiple industries of consumer electronics, industrial control, automobile electronics, communication equipment, aerospace, rail transit and the like. The biggest advantage is that the switch is turned on/off rapidly, and the switching loss is reduced. With the explosion of new energy, electric vehicles and other fields, MOSFETs (particularly wide bandgap semiconductors such as SiC/GaN MOSFETs) are becoming core devices of future power electronic systems. The product has wide application range and is mostly applied to industrial control and automobile electronics, so strict requirements are put forward for the reliability of the product, and in the packaging process of the product, the bonding force test of each welded component is particularly important, bonding force data of the welded component is accurately known, and the problems of functional failure, reliability verification failure and the like of the product caused by poor welding can be effectively avoided. At present, when the product is assembled and welded, the positions of PAD and connecting sheets (clips) on a chip are required to be accurately positioned, so that the tail parts of the connecting sheets and a frame are provided with limiting structures and welding positions when the product is designed. The tail part of the connecting sheet and the frame are provided with the limiting structure and the welding positioning power device packaging unit, so that the risk of deflection of the connecting sheet due to furnace curing is effectively avoided, the difficulty in measuring the bonding force of the connecting sheet is brought by the design, and the bonding force actually measured by the bonding force between the Source end of the connecting sheet (Clip) and the chip, between the Gate end of the connecting sheet (Clip) and the chip (due to the fact that the tail part of the whole connecting sheet and the frame are provided with the limiting structure and the welding reason) is the total bonding force of the bonding force between the Source end of the connecting sheet and the chip, between the Gate end of the connecting sheet and the chip, and between the connecting sheet and the frame. Therefore, a tool capable of cutting off the soldered power device package unit is required to measure the bonding force between the bond pad (Clip) Source terminal and the chip, and between the bond pad (Clip) Gate terminal and the chip. When the conventional cutting jig is used, layering can occur between the connecting sheet and the welding position of each component in the cutting process, or the joint of the connecting sheet and the component is excessively extruded, so that the power device packaging unit after cutting is seriously deformed at the cutting position, the problem that the total bonding force is measured to be deviated is caused, the actual bonding force of the connecting sheet after welding is effectively tested and verified, and the reliability of a product cannot be strictly controlled. In view of this, how to solve the problem that the bonding force measurement is inaccurate due to serious layering and deformation of the welding position of the connecting sheet and the packaging unit component when the conventional cutting jig cuts the diode chip of the packaging unit of the power device to be tested is the subject to be studied and solved by the utility model. Disclosure of utility model The utility model aims to provide a cutting jig and cutting equipment for welding test of a power device packaging unit, which are used for solving the problem that the bonding force measurement is inaccurate due to the fact that pins and chips are possibly damaged when pins of a diode chip are cut off by the conventional cutting jig. In order to achieve the above object, in a first aspect, the present utility model provides a cutting jig for welding test of a power device packaging unit, which is used for cutting operation of welding test of the power device packaging unit, the power device packaging unit comprises a chip and a connecting piece, the chip and the connecting piece are welded and fixed, and a cutting area is formed at a joint of the chip