Quartz crystal resonator laser welding process and laser welding equipment

Abstract

The invention relates to a quartz crystal resonator laser welding process and laser welding equipment. The quartz crystal resonator laser welding process comprises the following steps that S100, bases are assembled into a lower welding jig one by one after being sorted; s200, the tuning fork connecting end of each base is evenly coated with soldering paste; s300, the tuning fork pieces are assembled into an upper welding jig one by one after being sorted, the upper welding jig is assembled into a lower welding jig to form a welding jig, and the lower end of each tuning fork piece in the welding jig sinks into the welding paste and is transversely arranged between the two leads of the base; s400, the welding jig is conveyed into a welding station in laser welding equipment to be fixed, and laser heads are evenly distributed on the two sides, located on the welding jig, in the laser welding equipment; and S500, the laser head conducts laser welding on the tuning fork connecting ends of the base one by one at the preset welding interval, and the two electrode faces at the lower end of the tuning fork piece are welded and fixed to the two leads on the base correspondingly. The method has the effect of reducing energy consumption.

Description

Technical Field

[0001] This application relates to the technical field of laser welding, and in particular to a laser welding process and laser welding equipment for quartz crystal resonators. Background Technology

[0002] Crystal oscillators, also known as quartz crystal resonators, are commonly used in watches, mobile phones, tablets, microcomputers, calculators, home appliance automatic control, and industrial automatic control. Crystal oscillators are very important components in electronic products. During the operation of a crystal oscillator, the crystal vibrates to generate an oscillation circuit. The crystal, which converts electrical energy and mechanical energy into each other, works in a resonant state to provide stable and accurate single-frequency oscillation.

[0003] Currently, Chinese patent application number 2007201280433 discloses a tuning fork type quartz crystal resonator. Leads, glass beads, and Kovar rings constitute the base of the quartz crystal resonator. One end of the lead on the base is welded to the tuning fork electrode, which is the tuning fork connection end. The other end of the lead on the base extends to the outside of the housing, which is the circuit connection end. The tuning fork connection end of the base is coated with silver-tin flux, and then the tuning fork connection end of the base is welded to the tuning fork electrode.

[0004] The welding method between the tuning fork connection end and the tuning fork electrode is mostly to heat it with a heating tube, thereby melting the silver-tin flux and fixing the tuning fork connection end and the tuning fork electrode. However, the heating tube heating method requires the heating tube to be in a constantly open state, which consumes a lot of energy. Summary of the Invention

[0005] To reduce energy consumption, this application provides a laser welding process and laser welding equipment for quartz crystal resonators.

[0006] The laser welding process for quartz crystal resonators provided in this application adopts the following technical solution: A laser welding process for quartz crystal resonators includes the following steps: In step S100, the bases are sorted and then assembled one by one into the welding fixture; Step S200: Apply solder paste evenly to the tuning fork connection end of each base; Step S300: After sorting, the tuning fork pieces are assembled one by one into the upper welding fixture. The upper welding fixture is then assembled into the lower welding fixture to form the welding fixture. In the welding fixture, the lower end of each tuning fork piece is sunk into the solder paste and placed horizontally between the two leads of the base. In step S400, the welding fixture is conveyed to the welding station in the laser welding equipment and fixed therein. Laser heads are evenly distributed on both sides of the welding fixture in the laser welding equipment. In step S500, the laser head performs laser welding on the tuning fork connection ends of the base one by one at a preset welding interval, and welds and fixes the two electrode surfaces at the lower end of the tuning fork plate to the two leads on the base respectively.

[0007] Preferably, the laser heads on both sides of the laser welding equipment are tilted, and the laser heads are tilted at 30°-45° to make laser dots on the tuning fork connection end of the base.

[0008] Preferably, the laser head is an air-cooled semiconductor laser with a rated maximum power of 100W and a wavelength of 960nm.

[0009] Preferably, the laser head performs two laser dot-mapping operations on the tuning fork connection end of each base, with a welding speed of 1000mm / s, a power of 9.6W for each laser dot-mapping operation, and a laser dot-mapping time of 160ms.

[0010] The laser welding equipment provided in this application adopts the following technical solution: A laser welding equipment using the quartz crystal resonator laser welding process described above includes a frame and a conveying device mounted on the frame. The conveying device is used to convey a welding fixture. A welding station is provided on the frame, and a positioning part is provided at the welding station to restrict the movement of the welding fixture. The frame is equipped with a mounting bracket at the welding station. The mounting bracket is equipped with laser heads on both sides of the conveying device. The laser heads are inclined on the mounting bracket and are used to laser mark the tuning fork connection end of the base in the welding fixture. The laser head is inclined at 30°-45° on the tuning fork connection end of the base.

[0011] Preferably, the conveying device includes a conveying mounting frame and conveying wheels rotatably mounted at both ends of the conveying mounting frame. A conveyor belt is provided between the two conveying wheels, and a conveying motor for connecting with the conveying wheels is provided on the conveying mounting frame. A conveying clamping plate is provided on the conveying mounting frame, and a conveying gap is formed on the conveying clamping plate along the conveying direction of the conveyor belt. The conveying gap is used to adapt to the welding fixture.

[0012] Preferably, the positioning part includes a positioning cylinder, and a positioning rod is provided on the output rod of the positioning cylinder. The positioning rod is horizontally positioned in the conveying device under the drive of the positioning cylinder.

[0013] Preferably, the frame is provided with a support frame at the welding station, and a first detection sensor and a second detection sensor are provided on the support frame. The first detection sensor and the second detection sensor are respectively located on both sides of the positioning rod. The first detection sensor is used to control the movement of the laser head, and the second detection sensor is used to control the movement of the positioning cylinder. A blocking cylinder is installed on the frame and is located on the front side of the conveying direction of the welding station. A blocking rod is connected to the output rod of the blocking cylinder. The blocking rod extends into the conveying device under the drive of the blocking cylinder. The blocking cylinder is controlled by the second detection sensor.

[0014] Preferably, the upper welding fixture in the welding jig is used for assembling the tuning fork pieces, and the lower welding fixture in the welding jig is used for assembling the base. The lower welding fixture is provided with spaced-apart placement cavities for placing the base. An annular flow channel is provided around each of the placement cavities inside the lower welding fixture. Several air blowing ports are provided around each of the placement cavities on the lower welding fixture. The air blowing ports are connected to the annular flow channels. Each air blowing port is inclined toward the center of the placement cavity. The welding fixture is provided with at least one air passage, which is connected to each of the annular flow channels. The end face of the lower welding fixture facing the positioning part is provided with an air vent, which is connected to the air passage. The positioning rod is equipped with a telescopic vent that is adapted to the vent. An air duct is connected to the telescopic vent, and a solenoid valve is installed on the air duct. The air duct is used to introduce inert gas.

[0015] Preferably, the telescopic vent includes a vent sleeve disposed on the positioning rod and a vent head slidably installed in the vent sleeve. An air hole is axially penetrating inside the vent head, and the end of the vent head is arc-shaped. A telescopic spring is disposed inside the vent sleeve, one end of the telescopic spring is connected inside the vent sleeve, and the other end of the telescopic spring is connected to the vent head. The air tube passes through the air nozzle sleeve and is connected to the air nozzle head to communicate with the air hole.

[0016] In summary, this application includes at least one of the following beneficial technical effects: This application involves placing the base and tuning fork plate in a welding fixture, which is then conveyed to the welding station by a conveying device. Laser welding is then performed on the tuning fork connection end of the base on the welding fixture using a laser welding device, thereby completing the welding of the base and tuning fork plate. Compared to traditional electric heating tube welding, the laser head only operates when the welding fixture reaches the welding station, eliminating the need for it to be constantly running and thus reducing energy consumption to some extent. Attached Figure Description

[0017] Figure 1 This is a flowchart of the laser welding process.

[0018] Figure 2 This is an assembly diagram of the tuning fork plate and the base.

[0019] Figure 3 This is a top view of the tuning fork plate on the base.

[0020] Figure 4 This is a schematic diagram of the welding fixture.

[0021] Figure 5 This is a schematic diagram of the structure of a laser welding equipment.

[0022] Figure 6 This is a schematic diagram of the installation of the welding fixture on the conveying device.

[0023] Figure 7 This is the first installation diagram of the positioning unit.

[0024] Figure 8 This is the second installation diagram of the positioning part.

[0025] Figure 9 This is a schematic diagram showing the fit between the welding fixture and the positioning rod.

[0026] Figure 10 This is a schematic diagram of the welding fixture.

[0027] Explanation of reference numerals in the attached drawings: 1. Base; 101. Kovar ring; 102. Lead wire; 103. Tuning fork connection end; 104. Circuit connection end; 105. Solder paste; 2. Tuning fork plate; 201. Electrode surface; 3. Welding fixture; 31. Upper welding fixture; 310. Placement slot; 311. Positioning post; 32. Lower welding fixture; 320. Placement cavity; 321. Positioning hole; 33. Welding space; 4. Laser welding equipment; 41. Frame; 42. Conveying device; 421. Conveying mounting frame; 422. Conveying motor; 423. Conveying belt; 424. Conveying... Clamping plate; 425, conveying gap; 43, positioning part; 431, positioning cylinder; 432, positioning rod; 5, mounting bracket; 6, laser head; 7, support frame; 71, support section; 72, mounting section; 8, first detection sensor; 9, second detection sensor; 10, blocking cylinder; 11, blocking rod; 12, annular flow channel; 13, air blowing port; 14, air passage; 15, air vent; 16, telescopic nozzle; 161, nozzle sleeve; 162, nozzle head; 163, air hole; 164, telescopic spring; 17, air duct; 18, solenoid valve. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-10 This application will be described in further detail.

[0029] A laser welding process for quartz crystal resonators includes the following steps: In step S100, the bases 1 are sorted and assembled one by one into the welding fixture 32.

[0030] Step S200: Apply solder paste 105 evenly to the tuning fork connection end 103 of each base 1.

[0031] In step S300, the tuning fork pieces 2 are sorted and assembled one by one into the upper welding fixture 31. The upper welding fixture 31 is then assembled into the lower welding fixture 32 to form the welding fixture 3. In the welding fixture 3, the lower end of each tuning fork piece 2 is submerged in the solder paste 105 and placed horizontally between the two leads 102 of the base 1.

[0032] According to the technical solutions defined in steps S100 to S300, specifically, the base 1 includes a Kovar ring 101, glass beads, and two leads 102. The glass beads are assembled in the Kovar ring 101, and the two leads 102 are spaced apart within the glass beads in the Kovar ring 101. Figure 2 For reference angle, the two ends of the lead wire 102 protrude from the upper and lower ends of the base 1 respectively. The upper end of the base 1 is the tuning fork connection end 103, which is used to connect with the tuning fork plate 2. The lower end of the base 1 is the circuit connection end 104, which is used to connect to the circuit board.

[0033] Tuning fork piece 2 as Figure 2 As shown, the lower end of the tuning fork plate 2 is used to connect with the tuning fork connection end 103 of the base 1. The two surfaces of the lower end of the tuning fork plate 2 are electrode surfaces 201. By placing the tuning fork plate 2 horizontally between the two leads 102 of the base 1, the two electrode surfaces 201 of the lower end of the tuning fork plate 2 will abut against the two leads 102 respectively. Thus, by welding the two leads 102 to the two electrode surfaces 201 of the lower end of the tuning fork plate 2, the fixed connection between the tuning fork plate 2 and the base 1 can be completed.

[0034] The welding fixture 3 includes an upper welding fixture 31 and a lower welding fixture 32. The lower welding fixture 32 has a placement cavity 320 spaced apart for the base 1 to be placed. After the base 1 is sorted and its orientation is adjusted, the base 1 is placed in the placement cavity 320. The tuning fork connection end 103 of the base 1 will protrude from the upper surface of the lower welding fixture 32, and the two leads 102 will face the two sides of the lower welding fixture 32 respectively.

[0035] After the base 1 is assembled into the welding fixture 32, the solder paste 105 can be evenly applied to the tuning fork connection end 103 of each base 1. The solder paste 105 is laser welding solder paste 105. After the solder paste 105 is applied, a part of the lead wire 102 protruding from the upper end of the base 1 will be buried.

[0036] The upper welding fixture 31 is provided with a placement groove 310 for the tuning fork 2 to pass through. The lower welding fixture 32 is provided with positioning holes 321 on both sides. The lower welding fixture 32 is provided with positioning posts 311 that are adapted to the positioning holes 321 on both sides. By assembling the upper welding fixture 31 into the lower welding fixture 32, the position of each placement groove 310 corresponds to the position of each placement cavity 320.

[0037] After sorting and adjusting the orientation of the tuning fork pieces 2, the electrode surface 201 of the tuning fork pieces 2 is located at the lower end. The tuning fork pieces 2 are inserted into the placement groove 310. At this time, the lower end of the tuning fork pieces 2 will sink into the solder paste 105 and be placed horizontally between the two leads 102 of the base 1. The lower end of the tuning fork pieces 2 will divide the soldering into two parts, thus completing the assembly between the tuning fork pieces 2 and the base 1.

[0038] In step S400, the welding fixture 3 is conveyed to the welding station in the laser welding equipment 4 and fixed therein. Laser heads 6 are evenly distributed on both sides of the welding fixture 3 in the laser welding equipment 4.

[0039] In step S500, the laser head 6 performs laser welding on the tuning fork connection end 103 of the base 1 one by one at a preset welding interval, and welds and fixes the two electrode surfaces 201 at the lower end of the tuning fork plate 2 to the two leads 102 on the base 1 respectively.

[0040] According to the technical solution defined in steps S400 to S500, specifically, the welding fixture 3 has a welding space 33, the tuning fork connection end 103 of the base 1 is located in the welding space 33, and the laser head 6 makes laser dots on the tuning fork connection end 103 of the base 1 in the welding space 33. The laser heads 6 on both sides of the laser welding equipment 4 are set at an angle, and the laser heads 6 make laser dots on the tuning fork connection end 103 of the base 1 at an angle of 30°-45°. The angle of the laser head 6 is based on the actual working conditions, and this embodiment does not make specific limitations.

[0041] In one embodiment, the laser head 6 employs an air-cooled semiconductor laser with a rated maximum power of 100W and a wavelength of 960nm. The laser head 6 performs two laser-pointing operations on the tuning fork connection end 103 of each base 1, with a welding speed of 1000mm / s, a power of 9.6W for each laser-pointing operation, and a laser-pointing time of 160ms.

[0042] The following is a detailed description of laser welding equipment 4.

[0043] The laser welding equipment 4 includes a frame 41 and a conveying device 42 mounted on the frame 41. The conveying device 42 is used to convey the welding fixture 3. The welding fixture 3 is equipped with a base 1 and a tuning fork 2. The frame 41 is provided with a welding station. The conveying device 42 is used to convey the welding fixture 3 to the welding station. The frame 41 is provided with a positioning part 43 at the welding station to restrict the movement of the welding fixture 3.

[0044] The conveying device 42 is used to convey the welding fixture 3 to the welding station. The conveying device 42 includes a conveying mounting frame 421 and conveying wheels that are rotatably mounted at both ends of the conveying mounting frame 421. A conveyor belt 423 connected end to end is provided between the two conveying wheels. A conveying motor 422 for connecting to the conveying wheels is provided on the conveying mounting frame 421. The conveying motor 422 is connected to one of the conveying wheels. The conveying motor 422 drives the conveying wheel to rotate, and the conveying wheel can drive the conveyor belt 423 to move.

[0045] A conveying clamping plate 424 is provided on the conveying mounting frame 421. A conveying gap 425 is provided on the conveying clamping plate 424 along the conveying direction of the conveyor belt 423. The conveying gap 425 is adapted to the welding fixture 3. The welding fixture 3 is clamped in the conveying gap 425. The bottom of the welding fixture 3 is in contact with the conveyor belt 423. Thus, the conveyor belt 423 can drive the welding fixture 3 to move along the conveying gap 425 until the welding fixture 3 is moved to the welding station and blocked and positioned by the positioning part 43.

[0046] The positioning unit 43 includes a positioning cylinder 431, and a positioning rod 432 is provided on the output rod of the positioning cylinder 431. The positioning rod 432 is horizontally positioned in the conveyor device 42 under the drive of the positioning cylinder 431. The positioning rod 432 is horizontally positioned above the conveyor belt 423 of the conveyor device 42, and the positioning rod 432 can block the welding fixture 3, thereby preventing the welding fixture 3 from moving with the conveyor belt 423.

[0047] The frame 41 is equipped with a mounting bracket 5 at the welding station. The mounting bracket 5 is equipped with two laser heads 6 on both sides of the conveying device 42. The laser heads 6 are tilted on the mounting bracket 5 and face the welding fixture 3 in the conveying device 42. The laser heads 6 are used to laser mark the tuning fork connection end 103 of the base 1 in the welding fixture 3. The laser heads 6 are tilted at 30°-45° on the tuning fork connection end 103 of the base 1. The specific tilt angle of the laser heads 6 is subject to the actual working conditions.

[0048] The tuning fork plate 2 and the base 1 are assembled to form an unsoldered crystal oscillator. The unsoldered crystal oscillators are located side by side in the welding fixture 3. The laser emitted by the laser head 6 is used to make dots on the solder paste 105 on the tuning fork connection end 103 of the base 1, thereby welding and fixing the electrode surface 201 of the tuning fork plate 2 and the lead wire 102 of the base 1 together with the solder paste 105.

[0049] The welding fixture 3 is blocked in the welding station by the positioning part 43, thereby keeping the welding fixture 3 fixed. The laser head 6 is controlled by the host computer, which has a preset laser welding path. The laser welding path stores the spacing between adjacent unwelded crystal oscillators, so that the laser head 6 can spot-weld each unwelded crystal oscillator, thereby realizing the laser welding of the unwelded crystal oscillators to form a crystal oscillator.

[0050] In one embodiment, the laser head 6 employs an air-cooled semiconductor laser with a rated maximum power of 100W and a wavelength of 960nm. The laser head 6 performs two laser-pointing operations on the tuning fork connection end 103 of each base 1, with a welding speed of 1000mm / s, a power of 9.6W for each laser-pointing operation, and a laser-pointing time of 160ms.

[0051] A support frame 7 is provided at the welding station on the frame 41. A first detection sensor 8 and a second detection sensor 9 are installed on the support frame 7. The first detection sensor 8 and the second detection sensor 9 are located above the positioning rod 432 and on both sides of the positioning rod 432. Specifically, the support frame 7 includes a support section 71 and a mounting section 72. The support section 71 is set on the frame 41, and the mounting section 72 extends above the conveying device 42. The horizontal height of the mounting section 72 is higher than the upper surface of the welding fixture 3. The first detection sensor 8 and the second detection sensor 9 are set on the mounting section 72.

[0052] The conveyor belt 423 has a conveying direction that includes the front side for conveying into the welding station and the rear side for conveying out of the welding station. The first detection sensor 8 is located on the front side, and the second detection sensor 9 is located on the rear side. The first detection sensor 8 is used to control the laser's operation, and the second detection sensor 9 is used to control the positioning cylinder 431's operation.

[0053] A blocking cylinder 10 is installed on the frame 41. The blocking cylinder 10 is located on the front side of the conveying direction of the welding station. A blocking rod 11 is connected to the output rod of the blocking cylinder 10. The blocking rod 11 extends into the conveying device 42 under the drive of the blocking cylinder 10. The blocking cylinder 10 is controlled by the second detection sensor 9.

[0054] The first detection sensor 8 and the second detection sensor 9 are proximity switches. The proximity switches can be capacitive or inductive, depending on actual needs. The first detection sensor 8 and the second detection sensor 9 can be other sensors that can sense the position of objects. This embodiment does not specify the specific settings.

[0055] The laser welding equipment 4 in this application has a host computer. All electrical control components in the laser welding equipment 4 are electrically connected to and controlled by the host computer, which performs overall control.

[0056] In the initial state, neither the first detection sensor 8 nor the second detection sensor 9 detects the welding fixture 3. The positioning cylinder 431 drives the positioning rod 432 to be placed horizontally in the conveying device 42, and the blocking cylinder 10 does not drive the blocking rod 11 to be placed horizontally in the conveying device 42. The conveying device 42 transports the welding fixture 3 to the welding station and is blocked by the positioning rod 432.

[0057] At this time, the first detection sensor 8 senses the welding fixture 3 and outputs a signal to the host computer. The host computer controls the blocking cylinder 10 to move and place the blocking rod 11 horizontally in the conveying device 42 to prevent the subsequent welding fixture 3 from being conveyed to the welding station.

[0058] The first detection sensor 8 outputs a signal to the host computer, which then controls the laser head 6 to start. The laser head 6 performs laser welding on the unwelded crystal oscillator in the welding station. After the laser head 6 completes the laser welding of the welding fixture 3, the host computer controls the positioning cylinder 431 to operate. The positioning cylinder 431 drives the positioning rod 432 to not be placed horizontally in the conveying device 42, and the conveying device 42 transports the welding fixture 3 out of the welding station.

[0059] At this time, the second detection sensor 9 detects the welding fixture 3. When neither the first detection sensor 8 nor the second detection sensor 9 detects the welding fixture 3, it indicates that the welding fixture 3 has been completely transported away. The second detection sensor 9 outputs a signal to the host computer, which controls the positioning cylinder 431 to move. The positioning rod 432 is placed horizontally in the conveying device 42. The host computer controls the blocking cylinder 10 to move, and the blocking rod 11 is not placed horizontally in the conveying device 42, so that the subsequent welding fixture 3 is transported to the welding station through the conveying device 42. The welding fixture 3 is blocked by the positioning rod 432 and detected by the first detection sensor 8. The above actions are repeated in a cycle to realize the streamlined laser welding process of the crystal oscillator in the welding fixture 3.

[0060] To further improve the spatter of molten solder paste 105 during the laser welding process and to provide corresponding welding protection.

[0061] In this embodiment, an annular flow channel 12 is provided around each placement cavity 320 in the lower welding fixture 32. A plurality of air blowing ports 13 are spaced apart around each placement cavity 320 on the lower welding fixture 32. The upper end of the air blowing port 13 is connected to the upper surface of the lower welding fixture 32, and the lower end of the air blowing port 13 is connected to the annular flow channel 12. The upper end of each air blowing port 13 is inclined toward the center of the placement cavity 320.

[0062] The welding fixture 3 is provided with at least one air passage 14, which is connected to each annular flow channel 12. In this embodiment, there are two air passages 14, which are located on both sides of the annular flow channel 12. The end face of the welding fixture 32 facing the positioning part 43 is provided with an air vent 15, which is connected to the air passage 14. The number of air vents 15 is the same as the number of air passages 14, and there are two air vents 15.

[0063] The positioning rod 432 is equipped with a telescopic vent nozzle adapted to the vent 15. An air conduit 17 is connected to the telescopic vent nozzle, and a solenoid valve 18 is installed on the air conduit 17. The air conduit 17 is connected to an external air source and is used to introduce inert gas. Similarly, the number of telescopic vent nozzles corresponds to the number of vents 15; there are two telescopic vent nozzles. Along the conveying direction of the welding fixture 3, the telescopic vent nozzles are directly opposite the vent 15. When the welding fixture 3 is blocked by the positioning rod 432, the telescopic vent nozzles can abut against the vent 15. The solenoid valve 18 is also controlled by a host computer.

[0064] The telescopic vent includes a vent sleeve 161 mounted on a positioning rod 432 and a vent head 162 slidably mounted within the vent sleeve 161. An axially extending air hole 163 is formed within the vent head 162, and the end of the vent head 162 is arc-shaped, with the arc of the vent 15 matching the arc of the end of the vent head 162. A telescopic spring 164 is housed within the vent sleeve 161, with one end connected to the vent sleeve 161 and the other end connected to the vent head 162. An air conduit 17 passes through the vent sleeve 161 and connects to the vent head 162 to communicate with the air hole 163.

[0065] Therefore, when the conveying device 42 conveys the welding fixture 3 to the welding station and is blocked by the positioning rod 432, the telescopic vent nozzle abuts against the vent 15, the first detection sensor 8 senses the welding fixture 3, and the host computer controls the solenoid valve 18 to start. Inert gas is introduced into the air passage 14 through the air duct 17, the telescopic vent nozzle, and the vent 15. After passing through the air passage 14 and the annular flow channel 12, the blowing port 13 blows the inert gas toward the tuning fork connection end 103 of the base 1.

[0066] Subsequently, the host computer controls the laser head 6 to start, and the laser head 6 performs laser welding on the unwelded crystal oscillators in the welding station.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A laser welding process for quartz crystal resonators, characterized in that, Includes the following steps: In step S100, the bases (1) are sorted and then assembled one by one into the welding fixture (32); Step S200: Apply solder paste (105) evenly to the tuning fork connection end (103) of each base (1); In step S300, the tuning fork pieces (2) are sorted and assembled one by one into the upper welding fixture (31). The upper welding fixture (31) is then assembled into the lower welding fixture (32) to form a welding fixture (3). In the welding fixture (3), the lower end of each tuning fork piece (2) is sunk into the solder paste (105) and placed horizontally between the two leads (102) of the base (1). In step S400, the welding fixture (3) is conveyed to the welding station in the laser welding equipment (4) and fixed thereon. Laser heads (6) are evenly distributed on both sides of the welding fixture (3) in the laser welding equipment (4). In step S500, the laser head (6) performs laser welding on the tuning fork connection end (103) of the base (1) one by one at a preset welding interval, and welds and fixes the two electrode surfaces (201) at the lower end of the tuning fork plate (2) to the two leads (102) on the base (1) respectively.

2. The laser welding process for a quartz crystal resonator according to claim 1, characterized in that, The laser heads (6) on both sides of the laser welding equipment (4) are set at an angle, and the laser heads (6) make laser dots on the tuning fork connection end (103) of the base (1) at an angle of 30°-45°.

3. The laser welding process for a quartz crystal resonator according to claim 1, characterized in that, The laser head (6) is an air-cooled semiconductor laser with a rated maximum power of 100W and a wavelength of 960nm.

4. The laser welding process for a quartz crystal resonator according to claim 1, characterized in that, The laser head (6) performs two laser dot-mapping operations on the tuning fork connection end (103) of each base (1), with a welding speed of 1000 mm / s, a power of 9.6 W for each laser dot-mapping operation, and a laser dot-mapping time of 160 ms.

5. A laser welding device employing the laser welding process for quartz crystal resonators as described in any one of claims 1 to 4, characterized in that, Includes a frame (41) and a conveying device (42) disposed on the frame (41), the conveying device (42) being used to convey a welding fixture (3), a welding station being disposed on the frame (41), and a positioning part (43) being disposed at the welding station to restrict the movement of the welding fixture (3); The frame (41) is provided with a mounting bracket (5) at the welding station. The mounting bracket (5) is provided with laser heads (6) on both sides of the conveying device (42). The laser heads (6) are inclined on the mounting bracket (5). The laser heads (6) are used to laser mark the tuning fork connection end (103) of the base (1) in the welding fixture (3). The laser heads (6) are inclined at 30°-45° on the tuning fork connection end (103) of the base (1).

6. The laser welding equipment according to claim 5, characterized in that, The conveying device (42) includes a conveying mounting frame (421) and conveying wheels that are rotatably mounted at both ends of the conveying mounting frame (421). A conveyor belt (423) is connected end to end between the two conveying wheels. A conveying motor (422) for connecting with the conveying wheels is provided on the conveying mounting frame (421). A conveying clamping plate (424) is provided on the conveying mounting frame (421). A conveying gap (425) is formed on the conveying clamping plate (424) along the conveying direction of the conveyor belt (423). The conveying gap (425) is used to adapt to the welding fixture (3).

7. The laser welding equipment according to claim 5, characterized in that, The positioning part (43) includes a positioning cylinder (431), and a positioning rod (432) is provided on the output rod of the positioning cylinder (431). The positioning rod (432) is horizontally placed in the conveying device (42) under the drive of the positioning cylinder (431).

8. A laser welding device according to claim 7, characterized in that, The frame (41) is provided with a support frame (7) at the welding station. The support frame (7) is provided with a first detection sensor (8) and a second detection sensor (9). The first detection sensor (8) and the second detection sensor (9) are respectively located on both sides of the positioning rod (432). The first detection sensor (8) is used to control the action of the laser head (6), and the second detection sensor (9) is used to control the action of the positioning cylinder (431). A blocking cylinder (10) is provided on the frame (41). The blocking cylinder (10) is located on the front side of the conveying direction of the welding station. A blocking rod (11) is connected to the output rod of the blocking cylinder (10). The blocking rod (11) extends into the conveying device (42) under the drive of the blocking cylinder (10). The blocking cylinder (10) is controlled by the second detection sensor (9).

9. A laser welding device according to claim 5, characterized in that, The upper welding fixture (31) in the welding fixture (3) is used for assembling the tuning fork piece (2), and the lower welding fixture (32) in the welding fixture (3) is used for assembling the base (1); The lower welding fixture (32) is provided with placement cavities (320) for placing the base (1) at intervals. An annular flow channel (12) is provided around each of the placement cavities (320) in the lower welding fixture (32). A plurality of air blowing ports (13) are provided around each of the placement cavities (320) at intervals. The air blowing ports (13) are connected to the annular flow channel (12). Each air blowing port (13) is inclined toward the center side of the placement cavity (320). The welding fixture (3) is provided with at least one air passage (14), which is connected to each of the annular flow channels (12). The welding lower fixture (32) is provided with an air vent (15) on the end face facing the positioning part (43), which is connected to the air passage (14). The positioning rod (432) is provided with a telescopic vent that is adapted to the vent (15). The telescopic vent is connected to an air duct (17). An electromagnetic valve (18) is installed on the air duct (17). The air duct (17) is used to introduce inert gas.

10. A laser welding device according to claim 9, characterized in that, The telescopic vent includes a vent sleeve (161) mounted on the positioning rod (432) and a vent head (162) slidably mounted in the vent sleeve (161). The vent head (162) has an axially penetrating air hole (163). The end of the vent head (162) is arc-shaped. A telescopic spring (164) is provided inside the vent sleeve (161). One end of the telescopic spring (164) is connected inside the vent sleeve (161), and the other end of the telescopic spring (164) is connected to the vent head (162). The air duct (17) passes through the air nozzle sleeve (161) and is connected to the air nozzle head (162) to communicate with the air hole (163).

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