Welding treatment method for wire ring of fretsaw

Abstract

The invention belongs to the technical field of wire welding, and particularly discloses a welding treatment method of a wire ring of a fretsaw, which comprises the following steps: clamping, centering and contacting a fretsaw wire by using a clamping structure, spot-welding a joint of the fretsaw wire by using a pulse laser welding machine, and finally carrying out local heat treatment on a welding spot by using a heating device, so that the heat treatment effect is accurately controlled, and the performance of the welding spot is improved. And the performance of other positions of the fret saw wire is not affected, a welding joint with good appearance is finally obtained, the welding spot is high in toughness and not prone to breakage, the welding joint can be not broken after being bent by 180 degrees, and the continuous working service time of the product is prolonged by several times.

Description

Technical Field

[0001] The invention belongs to the technical field of wire welding, and specifically discloses a welding processing method for a wire saw wire ring. Background Art

[0002] As the wafer of semiconductor substrate, the first step in processing is slicing. The quality of slicing has an important impact on the quality of the final wafer. The wire saw cutting method has the advantages of uniform cutting, small thermal effect and small damage layer. It is widely used in processing fields such as silicon wafer cutting in photovoltaic and chip industries.

[0003] The wire diameter and strength of the saw wire have a direct impact on the life of the wire saw wire loop. Currently, the wire saw wire loop is mostly manufactured by welding. In order to meet the cutting quality, the wire saw wire loop welding point is required to be smooth and flat, without misalignment, without obvious angles, and the diameter cannot be too large or too small. In actual work, for the welding of thinner metal wire bundles (about 100 microns), due to the thin diameter of the saw wire, it is difficult to fix and restrict the saw wire to a specified position using conventional mechanical biting or clamping devices. Before welding, the two ends of the saw wire need to be accurately aligned on a line, and the two ends of the saw wire need to fit closely together. Otherwise, it is easy to cause the welding head to be loose and the breaking force to be low, or the welding point diameter is too large due to inaccurate docking, and the weld morphology is difficult to guarantee. It is difficult to achieve the welding of the wire saw wire loop and obtain qualified welding points using conventional welding operations.

[0004] Due to the thermal process and weld structure of the welding organization, the weak point of the wire saw wire loop is usually near the welding point. Metals such as high carbon steel are prone to form martensitic structure after welding. The welded joint is brittle, the performance of the weld organization is poor, and it is easy to break when subjected to bending force. The existing technology lacks an efficient method suitable for clamping thinner metal wire bundles and a welding processing process with a high pass rate. Summary of the invention

[0005] In order to solve the problems in the background technology, the present invention discloses a welding processing method for a wire saw wire ring, which utilizes a clamping structure to clamp and align the wire saw wire, adopts a pulse laser welder to spot weld the wire joints, and finally performs local heat treatment on the weld points. The weld points of the final product have high toughness and can be bent 180 degrees without breaking, and the continuous working time of the product is extended several times.

[0006] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0007] A method for welding a wire saw wire loop comprises: using a welding clamp to center and contact the two ends of the wire saw wire, inspecting and fine-tuning the centering and contact of the wire saw wire under a stereo microscope, spot welding the joints of the wire saw wire using a pulse laser welder, and finally locally heating the welding points using a heating device.

[0008] Furthermore, in the welding processing method of the wire saw wire loop, the wire diameter of the wire saw wire loop is 80-150 microns.

[0009] Furthermore, the welding processing method of the wire saw wire loop utilizes an electric heating rod or electric heating tweezers to perform local heating processing on the welding point at 650-750 degrees.

[0010] Furthermore, in the welding processing method of the wire saw wire ring, the welding clamp includes a base, two bases are arranged at intervals in the middle of the base along the length direction of the base, the gap between the bases is a welding groove, and recessed V-shaped wire grooves are respectively provided on the top of the bases, and the wire grooves are arranged on the same straight line and perpendicular to the welding grooves, and matching pressure blocks are respectively provided above the wire grooves, and U-shaped connecting frames with downward openings are respectively provided above the bases, the bottom of the connecting frame is fixedly connected to the base, and a top screw is threadedly connected to the connecting frame, and the lower end of the top screw is in tight contact with the pressing block, and the degree of fit between the pressing block and the wire groove can be adjusted by adjusting the extension amount of the top screw.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The welding processing method of the wire saw wire ring disclosed in the present invention uses a clamping structure to clamp and center the wire saw wire, then uses a pulse laser welder to spot weld the wire joint, and finally uses a heating device to perform local heat treatment on the welding point, accurately controls the heat treatment effect, improves the performance of the welding point, and does not affect the performance of other positions of the wire saw wire. Finally, the obtained welding joint has a good morphology, the welding point has high toughness, is not easy to break, can be bent 180 degrees without breaking, and the continuous working time of the product is extended several times;

[0013] The welding clamping in the welding processing method of the wire saw wire ring disclosed in the present invention is suitable for centering clamping and fine-tuning of thinner metal wire bundles, can perform clamping efficiently, and is designed with a welding groove to prevent the welding point from sticking to the tooling and reduce the influence of heat conduction of the tooling, which can improve the qualified rate of welding point formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the welding clamp in the present invention. Figure 1 ;

[0016] Figure 2 This is a schematic diagram of the three-dimensional structure of the welding clamp in the present invention. Figure 2 ;

[0017] Figure 3 It is a schematic diagram of the solder joint heat treatment method in the present invention. Figure 1 ;

[0018] Figure 4 It is a schematic diagram of the solder joint heat treatment method in the present invention. Figure 2 ;

[0019] In the above figure: 1-base; 2-base; 3-pressing block; 4-connecting frame; 5-top screw; 6-wire groove; 7-welding groove; 8-welding point; 9-wire saw wire ring; 10-heating rod; 11-temperature controller; 12-bracket; 13-electric heating tweezers. DETAILED DESCRIPTION

[0020] In order to better understand the present invention, the content of the present invention is further clearly set forth in conjunction with the embodiments below, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0021] Combined with Figure 1-4 , a welding processing method for a wire saw wire ring of the present invention is elaborated in detail, the two ends of the wire saw wire are centered and contacted by welding clamps, the centering and contact of the wire saw wire are checked and fine-tuned under a stereo microscope, and after confirming that the wire saw wire is centered and contacted, a pulse laser welder is used to spot weld the joints of the wire saw wire, and finally the welding point 8 is locally heated by a heating device. In the present invention, the welding point performance is improved by locally heating the welding point 8 after welding, and the heat treatment effect is accurately controlled without affecting the performance of the remaining positions of the wire saw wire. Finally, a wire saw wire ring product with a high pass rate and good quality is obtained. The product has a good welding joint morphology, high toughness at the welding point, is not easy to break, can be bent 180 degrees without breaking, and the continuous working time of the product is extended several times. The welding processing method for the wire saw wire ring of the present invention has high processing efficiency, high processing pass rate, good product quality, and long product service life.

[0022] As an optional design, the welding processing method of the wire saw wire ring is preferred, and the wire diameter of the wire saw wire ring 9 is 80-150 microns. Here, it should be noted that the welding processing method of the wire saw wire ring of the present invention is suitable for welding processing of wire saw wires with a wire diameter of about 100 microns.

[0023] As an optional design, the welding processing method of the wire saw wire ring is preferably used, using an electric heating rod 10 or electric heating tweezers 13 to perform local heating treatment on the welding point 8 at 650-750 degrees for 10-20 seconds, so as to accurately control the heat treatment position and the strengthening effect of the heat treatment.

[0024] As an optional design, the welding processing method of the wire saw wire ring is preferred, and the welding clamp includes a base 1, two bases 2 are arranged at intervals in the middle of the base 1 along the length direction of the base 1, the gap between the bases 2 is a welding groove 7, and V-shaped wire grooves 6 with recessed settings are respectively provided on the top of the base 2, and the wire grooves 6 are arranged on the same straight line and perpendicular to the welding grooves 7, and matching pressure blocks 3 are respectively provided above the wire grooves 6, and U-shaped connecting frames 4 with downward openings are respectively provided above the base 2, the bottom of the connecting frame 4 is fixedly connected to the base 1, and a top screw 5 is threadedly connected to the connecting frame 4, and the lower end of the top screw 5 is in tight contact with the pressing block 3, and the top screw 5 is adjusted by The extension amount can adjust the fit between the pressing block 3 and the wire groove 6. During operation, the two ends of the wire saw wire are respectively passed from the outside of the wire groove 6 along the wire groove 6 toward the direction close to the welding groove 7. When the two ends of the wire saw wire are respectively passed to the top of the welding groove 7, the centering and contact of the wire saw wire are checked and fine-tuned under a stereo microscope to observe whether the wire saw wire is centered and fits. After confirming that the wire saw wire is centered and fits, a pulse laser welder is used to spot weld the joints of the wire saw wire. The welding clamping device in the present invention is designed with a V-shaped clamping groove structure suitable for the centering and fine-tuning of thinner metal wire bundles, which can efficiently perform clamping and centering. The welding clamping device is designed with a welding groove 7 which prevents the welding point from sticking to the tooling and reduces the influence of heat conduction of the tooling, thereby improving the qualified rate of welding point formation.

[0025] The working process of the present invention is as follows:

[0026] Use Figure 1 and Figure 2 The welding clamp shown is used to clamp the wire saw wire to be welded, and the two ends of the wire saw wire are placed at the bottom of the V-shaped wire groove 6 respectively, and the two end heads are moved to the position of the welding groove 7. Observe and fine-tune under a stereo microscope, and make the two end faces contact and fit. The docking point of the wire saw wire is located above the middle of the welding groove 7. The wire saw wire is fixed with a pressure block 3 or tape. Under a stereo microscope, the welding clamp is rotated to observe whether the docking point of the wire saw wire is aligned and fitted. After confirming that the wire saw wire is aligned and fitted, the pulse laser welder is moved to the top of the wire docking point and focused, and the welding parameters (pulse power, pulse width, protective gas, etc.) are adjusted and welded. The condition of the weld point 8 is checked under a stereo microscope, and the pressure block 3 or tape is removed, and the wire saw wire ring 9 is removed. The weld point 8 after welding is high in strength but brittle, and is easy to break when subjected to a small lateral shear force when bent. Figure 3 or Figure 4 Heat treating the solder joint 8 in a manner as follows;

[0027] like Figure 3 As shown, the electric heating rod 10 is supported by a bracket 12, and the electric heating rod 10 is connected to a temperature control power supply 11 to heat the electric heating rod 10. The temperature of the electric heating rod 10 reaches 650-750 degrees, preferably 700 degrees, and the welding point 8 is closely attached to the surface of the electric heating rod 10 for heating for about 15 seconds, or as Figure 4 As shown, the electric heating tweezers 13 are connected to the temperature control power supply 11 to heat the electric heating tweezers 13. The temperature of the electric heating tweezers 13 reaches 650-750 degrees, preferably 700 degrees. The electric heating tweezers 13 are used to clamp the welding point 8 and heat it for about 15 seconds. After local heat treatment, the toughness of the welding point 8 is improved, it is not easy to break, it can be bent 180 degrees without breaking, the materials at other positions of the wire saw wire ring 9 are not affected, the product can be continuously cut, and the service life is increased by several times. The welding point morphology obtained by welding high-carbon steel wire saw wire according to the method of the present invention is smooth and flat. The morphology of the welding head after welding of the present invention under a 50x stereo microscope has no misalignment and angle, and the wire diameter change is within 10%. The toughness of the wire saw wire ring product is improved, it is not easy to break, it can be bent 180 degrees without breaking, and the materials at other positions of the wire saw wire ring are not affected, the product can be continuously cut, and the service life is increased by several times.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for welding a wire saw wire ring, characterized in that: Use welding clamps to align and contact the two ends of the wire saw wire. Check and fine-tune the alignment and contact of the wire saw wire under a stereo microscope. Use a pulsed laser welder to spot weld the joints of the wire saw wire. Finally, use a heating device to locally heat the welding points.

2. The welding method for wire saw wire loop according to claim 1, characterized in that: The wire diameter of the wire saw loop is 80-150 microns.

3. The welding method for wire saw wire loop according to claim 1 or 2, characterized in that: Use an electric heating rod or electric heating tweezers to locally heat the solder joint at 650-750 degrees.

4. The welding method for wire saw wire loop according to claim 3, characterized in that: The welding clamp includes a base, two bases are arranged at intervals in the middle of the base along the length direction of the base, the gap between the bases is a welding groove, and V-shaped wire grooves with recessed settings are respectively provided on the top of the bases. The wire grooves are arranged on the same straight line and perpendicular to the welding grooves, and matching pressure blocks are respectively provided above the wire grooves. U-shaped connecting frames with downward openings are respectively provided above the bases, the bottom of the connecting frame is fixedly connected to the base, and a top screw is threadedly connected to the connecting frame, and the lower end of the top screw is in tight contact with the pressing block, and the degree of fit between the pressing block and the wire groove can be adjusted by adjusting the extension amount of the top screw.

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