CN201012430Y - Micro High Speed Inertial Friction Welding Machine - Google Patents

Abstract

The utility model relates to a miniature high-speed inertial friction welding machine, which cancels all intermediate transmission links, has the advantages of high speed, compact structure, easy balance, high transmission efficiency, light weight, quick response, small vibration, low noise, etc., and realizes Miniaturization and high speed of inertial friction welding machine. The utility model includes a welding machine main shaft installed on the bed, a working slide table connected with a thrust oil cylinder, an electric main shaft connected with the main shaft of the welding machine and a flywheel installed on the main shaft of the welding machine through an electromagnetic clutch, a rotary fixture connected with the main shaft of the welding machine, and moving The fixture is installed on the working slide table, the electric spindle is connected with a frequency converter and a sensor, and the frequency converter and the sensor are connected with the controller.

Description

Micro High Speed Inertial Friction Welding Machine

1. Technical field:

The utility model relates to a welding machine, in particular to a miniature high-speed inertial friction welding machine.

2. Background technology:

Friction welding technology, as an advanced solid-state connection technology (the welding zone is forged structure), has technical and economic characteristics such as high quality, high efficiency, energy saving, low consumption, and cleanliness. The close combination of high-tech such as integration, software, reliability engineering, etc., itself is also being displayed in front of people with the appearance of high-tech, and has broad development applications and industrial prospects.

With the development of modern micro-machinery and micro-processing technology, one of the development directions of friction welding machine is to realize the miniaturization and high-speed of welding machine.

The domestic friction welding machine manufacturing industry started in the 1970s. After more than 30 years of development, the research and development and production of general friction welding machines have formed a certain scale, which meets the needs of domestic low-end and some mid-end users to a certain extent. However, compared with foreign countries, the overall level and market competitiveness of domestic friction welding technology are still far behind, far from being able to meet the urgent needs of the domestic market. Reports are very rare.

Abroad, there are only reports on the development and production of micro-welding machines by MTI Corporation of the United States and KUKA Corporation of Germany. The 40-type micro-high-speed inertial friction welding machine produced by MTI Corporation adopts a structural scheme in which the spindle drive motor and the spindle body are coaxially installed, and the spindle speed is 45,000 -60000rpm, the maximum moment of inertia of the flywheel is 0.00036kg·m ² , the maximum welding force is 2.2KN, and the maximum welding area of the tubular workpiece is 45.2mm ² ; the maximum welding force of the RS05E friction welding machine produced by KUKA is 5.0KN. The diameter of the piece (low carbon steel) is φ2-φ8mm.

3. Contents of the utility model:

In order to solve the shortcomings in the above-mentioned background technology, the utility model provides a miniature high-speed inertial friction welding machine, which cancels all intermediate transmission links, and has the advantages of high speed, compact structure, easy balance, high transmission efficiency, light weight, and responsive welding. The advantages of speed, small vibration and low noise have realized the miniaturization and high speed of the inertial friction welding machine.

In order to achieve the above object, the technical solution adopted by the utility model is:

A miniature high-speed inertial friction welding machine, which is special in that: it includes the welding machine main shaft installed on the bed, the working slide is connected to the thrust oil cylinder, the electric main shaft is connected to the welding machine main shaft through the electromagnetic clutch and the welding machine is installed on the main shaft. The flywheel is connected, the rotating fixture is connected with the main shaft of the welding machine, the moving fixture is installed on the working slide table, the frequency converter and the sensor are connected on the electric main shaft, and the frequency converter and the sensor are connected with the controller.

The electric spindle is supported by angular contact ball bearings.

The rotating and moving fixtures use miniature precision collets.

The guide rail of the working slide table adopts the linear guide rail with high guiding precision.

The bearing of the electric spindle and the bearing of the welding machine spindle are connected with the lubricator.

The electromagnetic clutch includes an outer sleeve, and the end cover plate is connected with the outer sleeve to form a housing. The excitation coil is installed in the housing, and the excitation coil is connected to the coil frame. The magnetic ring is made of rare earth strong permanent magnet material NdFeB material, glued On the annular bosses of the left and right end covers, rubber gaskets are glued on the end faces of the magnetic rings. The middle hole of the left end cover is provided with an external spline shaft connected to the shaft body of the electric spindle. The right end cover The middle hole is provided with another external spline shaft connected with the main shaft body of the welding machine on which the flywheel is installed. The spline sleeve, end cover plate, and outer sleeve are all made of magnetically conductive materials, the outer spline shaft and the other outer spline shaft are made of non-magnetically conductive materials, the exciting coil is connected to the DC power supply through a relay, and the relay is connected to the DC power supply. There are varistors.

The controller is a programmable controller, and the man-machine interface is connected with the programmable controller.

Compared with the prior art, the utility model has the following advantages and effects:

1. The utility model integrates the electric spindle unit technology in the high-speed cutting processing technology, realizes the coaxial configuration and direct drive of the welding machine spindle-flywheel and its driving motor, cancels all intermediate transmission links, and its transmission chain length is zero ("Zero transmission"), and has the advantages of high speed, compact structure, easy balance, high transmission efficiency, light weight, quick response, small vibration, low noise, etc., thus realizing the miniaturization and high speed of inertial friction welding machine.

2. The utility model makes the lower limit of the inherent moment of inertia reach 3.2×10 ^-5 kgm ² through the optimized design of the structure of the welding machine main shaft and its shaft system rotating parts; Under the condition of high speed, the dynamic balance quality of the main shaft of the welding machine and its rotating parts of the shaft system is good.

3. The electromagnetic clutch in this utility model adopts a small inertia, push-pull type, and spline tooth structure, which can ensure frequent, fast and reliable clutching and transmission of relatively large frictional peak torque of the electromagnetic clutch at an ultra-high speed of up to tens of thousands of revolutions , has the advantages of compact structure, small size, small moment of inertia, fast response, etc., and realizes the miniaturization of the electromagnetic clutch.

4. The lower limit of the workpiece size that can be welded by the utility model can be as small as Φ1.5mm (bar).

4. Description of drawings:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of electric spindle in the utility model;

Fig. 3 is the electrical connection diagram of the electric spindle in the utility model;

Fig. 4 is the schematic diagram of the structure when the electromagnetic clutch is separated in the utility model;

Fig. 5 is a structural schematic diagram when the electromagnetic clutch is engaged in the utility model;

Fig. 6 is the power wiring diagram of the magnetic clutch excitation coil in the utility model;

Fig. 7 is a schematic diagram of the hydraulic system in the utility model;

Fig. 8 is the wiring diagram of computer measurement and control system in the utility model;

Fig. 9 is the wiring diagram of the controller in the computer measurement and control system;

Figure 10 is a computer control flow chart.

In the figure, 1-electric spindle, 2-electromagnetic clutch, 3-welding machine spindle, 4-flywheel, 5-rotating fixture, 6-rotating side workpiece, 7-moving side workpiece, 8-moving fixture, 9-thrust cylinder, 10-bed, 11-linear guide, 12-working slide, 13-rotor shaft, 14-front dust cover, 15-front nut, 16-front small cover, 17-front bearing, 18-front outer septum , 19-front inner septum, 20-front outer jacket, 21-front bearing seat, 22-stator, 23-housing and water jacket, 24-rear bearing, 25-rear inner septum, 26-rear outer septum, 27-ball cage, 28-rear bearing housing, 29-rear nut, 30-adjusting pad, 31-spring seat and spring, 32-back cover, 33-water inlet, 34-oil inlet, 35-wire seat, 36-oil outlet, 37-water inlet, 38-top wire, 39-water outlet, 40-oil inlet, 41-oil outlet, 42-water inlet, 43-oil mist generator, 44-pressure relay, 45 -Inverter, 46-external spline shaft, 47-magnetic ring, 48-inner spline sleeve, 49-outer sleeve, 50-excitation coil, 51-coil bobbin, 52-rubber washer, 53-end cover plate, 54-external spline shaft, 55-relay, 56-relay, 57-excitation coil, 58-varistor, 59-oil tank, 60-suction oil filter, 61-hydraulic pump, 62-motor, 63-line gap Type oil filter, 64-pressure gauge, 65-pressure gauge, 66-pressure gauge, 67-base plate, 68-pressure reducing valve, 69-flow control valve, 70-electromagnetic reversing valve, 71-pressure reducing valve, 72 -flow control valve, 73-electromagnetic reversing valve, 74-electromagnetic overflow valve, 75-one-way valve, 76-three-position four-way electromagnetic reversing valve, 77-cooler, 78-thrust cylinder, 79-hose Assembly, 80-hose assembly, 81-pressure relay, 82-light, 83-hydraulic start light, 84-hydraulic stop light, 85-clutch, 86-clutch, 87-hydraulic pump motor, 88-spindle frequency conversion Device, 89-electric spindle, 90-welding start button, 91-welding stop button, 92-emergency stop button, 93-sliding table original position travel switch, 94-sliding table fast travel switch, 95-sliding table remote limit Position, 96-weldment contact pressure switch, 97-water pressure switch, 98-water mist air pressure switch, 99-lubricator liquid level, 100-lubricator liquid level, 101-frequency conversion preset speed arrival, 102-hydraulic pressure Pump start, 103-hydraulic pump stop, 104-displacement sensor, 105-speed setting. 106-Hydraulic setting, 107-Sliding table fast forward, 108-Sliding table working forward, 109-Upsetting, 110-Sliding table fast forwarding, 111-Clutch close, 112-Hydraulic oil pump motor, 113-Welding start instruction, 114- Welding stop indication.

5. Specific implementation methods:

The utility model is mainly composed of a main machine mechanical system, a hydraulic system, a sensing and sensor system, and a computer measurement and control system. The structural features of each subsystem are as follows:

1. Host mechanical system:

See Figure 1, the main configuration of the host mechanical system is shown in Figure 1, which mainly consists of a high-speed electric spindle 1, an electromagnetic clutch 2, a welding machine spindle 3, a flywheel 4, a rotating fixture 5, a moving fixture 8, a thrust cylinder 9, and a bed 10 , box, bracket and other supporting parts (large pieces). Among them: electric spindle 1 (built-in motor spindle) is the power source of the mechanical system of the welding machine. It is connected with the welding machine spindle 3 and the flywheel 4 installed on it through the electromagnetic clutch 2. Its support is 7204C (C-level precision, two 1) and 7203C (C-level precision, one) type angular contact ball bearing; the function of flywheel 4 is to provide the energy required for welding the workpiece mainly by the rotational kinetic energy released by it (mainly converted into frictional heating power), so that the electric spindle 1 The power of the built-in motor is greatly reduced; both the rotating fixture 5 and the moving fixture 8 adopt miniature precision collets, the rotating fixture 5 is connected with the main shaft 3 of the welding machine, the moving fixture 8 is installed on the working slide 12, and the working slide 12 The feed is driven by the thrust cylinder 9, and its guide rail is a linear guide rail 11 with high guiding precision; in the structural design, the self-stiffness, local stiffness and contact stiffness of each support (large piece) are also considered comprehensively.

The rotation speed of the main shaft or flywheel of the welding machine of the utility model can be as high as 50000rpm. Since the welding energy required for the welding of fine workpieces is very small, when designing the mechanical transmission system of the welding machine, the main shaft and its shaft of the welding machine must be minimized. The inherent moment of inertia of the transmission parts (excluding the flywheel) is used to reduce the lower limit of the workpiece size that can be welded by the welding machine as much as possible. After calculation, the inherent moment of inertia of the rotating parts of the main shaft of the welding machine is 3.2×10 ^-5 kgm ² , and its maximum output power is 0.058KW. In order to meet the requirements for welding workpieces of different materials and sizes, the moment of inertia of the flywheel is classified into three levels, namely 3.7×10 ^-3 kgm ² , 1.56×10 ^-3 kgm ² , and 4.83×10 ^-4 kgm ² .

Referring to Fig. 2 and Fig. 3, the function of the high-speed electric spindle unit is to drive the shaft system rotating parts such as the welding machine main shaft and the flywheel installed on the main shaft, and its structure is shown in Fig. 2 . The maximum speed of the electric spindle is 60000rpm, and the output power is 2.0KW; the front bearing 17 and the rear bearing 24 are respectively B7003C/P4×1 and B7002C/P4×1 angular contact ball bearings, the former has a limit speed of 60000rpm, and the latter has a limit speed of 75000rpm; the electric spindle adopts oil mist lubrication, which has dual functions of lubrication and cooling. The method uses compressed air as the power, and the oil is atomized and mixed into the air flow through the oil mist generator 43, and then transported to the parts that need to be lubricated . When the electric spindle rotates at high speed, the oil mist can form an elastic lubricating oil film in the bearing groove. Oil mist lubrication is continuous lubrication, and the oil mist enters the bearing continuously through the oil circuit. See Figure 3 for the connection diagram of the oil circuit and the gas circuit of the oil and gas mixing device.

The high-speed electric spindle adopts the VCT2840 frequency conversion speed controller (1000Hz) produced by Danfuss Company of Denmark for stepless speed regulation. The frequency conversion speed controller has speed control functions such as U ₁ /f ₁ =Const proportional control speed regulation, network voltage compensation, motor speed PID adjustment, motor acceleration start and brake quick stop control, as well as overcurrent, overvoltage, overheating, lack of Equal protection function, so its safety and reliability are high.

Referring to Figure 4 and Figure 5, the electromagnetic clutch adopts a small inertia, push-pull type, spline tooth structure, and the spline tooth mechanical fitting pair is used as the engaging element. Referring to Fig. 4 , it includes the outer sleeve 49, the end cover plate 53 is connected with the outer sleeve 49 to form a housing, and the excitation coil 50 is installed in the housing, and the excitation coil 50 is tightly wound on the coil frame 51, and the left end cover plate 53 The hole is provided with an external spline shaft 46 connected to the shaft body of the electric spindle, and the hole in the right end cover plate 53 is provided with an external spline shaft 54 connected to the shaft body of the welder main shaft on which the flywheel is installed, and the external spline shaft 46 and The outer spline shaft 54 is connected with the inner spline sleeve 48 on one side of the magnetic ring 47 by a spline. According to the requirements of the magnetic circuit design, the magnetic ring 47 is made of rare earth strong permanent magnet material NdFeB material, and it is glued to the annular bosses of the left and right side end cover plates 53, in order to prevent the inner spline sleeve Impact occurs when 48 and magnetic ring 47 are attracted, and a certain thickness of rubber washer 52 is glued on the end face of magnetic ring 47; inner spline sleeve 48, end cover plate 53, and outer sleeve 49 are all made of magnetically conductive material electrician pure iron DT4A Made, the external spline shaft is made of non-magnetic material 1Cr18Ni9Ti stainless steel. The excitation coil 50 of the electromagnetic clutch is tightly wound on its coil frame 51 , the effective diameter of the copper wire is 0.55 mm, the number of winding layers is 31 layers, the number of turns in each layer is 61 turns, and the excitation current is 1.03A. The calculation results show that the maximum suction or repulsion generated by the electromagnetic clutch is 4.5kg, and the maximum torque transmitted is 0.045kgm.

Referring to Fig. 6, the excitation coil 57 of electromagnetic clutch is powered by DC power supply (24VDC), and excitation coil 57 is connected with DC power supply by relay 55 and relay 56, is connected with varistor 58 on the relay, and the direction of excitation current is determined by relay 55 in the figure. Or relay 56 control, the effect of piezoresistor 58 is to be used for protecting the relay contact, prevents from producing arc between the contact and damages contact when frequent on-off circuit.

Referring to Fig. 4, when the electromagnetic clutch is in a disengaged state, the inner spline sleeve 48 is only engaged with the outer spline shaft 46; referring to Fig. 5, when the relay is energized, a forward excitation current passes through the exciting coil 50, and the inner spline Under the combined action of the repulsive force produced by the left magnetic ring and the suction force produced by the right magnetic ring, the sleeve 48 accelerates to move axially to the right, and its spline teeth are in the same position as the external spline shaft 46 and the external spline shaft 54. In the closed state, that is, the shaft body of the electric spindle 1 is engaged with the welding machine spindle 3, and the electromagnetic clutch is in the engaged state; on the contrary, when the relay 55 is energized (the relay 56 is de-energized), the excitation coil 50 passes through the reverse excitation current, and the internal flower Under the combined action of the repulsive force produced by the right magnetic ring and the suction force produced by the left magnetic ring, the key sleeve 48 accelerates to move axially to the left, and its spline teeth are fitted with the external spline shaft 46, and are fitted with the external spline shaft 46. The shaft 54 is disengaged, that is, the main shaft 3 of the welding machine is separated from its power source, and the electromagnetic clutch is in a disengaged state. As long as the direction of the excitation current in the excitation coil is alternately changed through the welding machine computer measurement and control system, the engagement or separation of the electromagnetic clutch can be controlled alternately.

During actual work, the welder main shaft 3 and the flywheel 4 mounted on it are connected to the electric main shaft 1 through the outer spline shaft 46 in the electromagnetic clutch 2, the inner spline sleeve 48, and the outer spline shaft 54. During inertial friction welding, the rotating end of the workpiece to be welded is clamped in the rotating fixture 5, while its moving end is clamped in the moving fixture 8 on the work slide 12, and the flywheel 4 is first accelerated to a preset speed (electromagnetic The clutch is in the engaged state), and the energy required for welding is stored in the form of rotational kinetic energy, and then the welding machine main shaft 3 is disengaged from the electric main shaft 1 through the electromagnetic clutch 2 (the electromagnetic clutch 2 is in the disengaged state), and the flywheel 4 enters inertial operation; when the moving fixture 8. Under the action of the axial force exerted by the thrust cylinder 9, the moving end of the clamped workpiece moves closer to, touches and presses the workpiece 6 on the rotating side, and the flywheel, which is in inertial operation, is damped by the friction torque, and its speed gradually increases. The rotational kinetic energy stored in the flywheel gradually converts most of its energy into heat energy through the high-speed friction between the surfaces of the workpieces to be welded, and quickly heats the friction surface and its nearby metal until the flywheel stops rotating and maintains its energy. After pressing for a period of time, the welding process is over.

2. Hydraulic control system:

Referring to Figure 7, the hydraulic control system is mainly composed of a hydraulic pump 61, a thrust cylinder 78, and a hydraulic control valve group. Automatic transformation of working procedures. The schematic diagram of the hydraulic control system is shown in Figure 7.

The working principle of the hydraulic control system is briefly described as follows:

System pressure building and pressure regulation: start the control button of the hydraulic pump 61, the electromagnet 1DT is energized, and the system pressure is built. The system pressure is regulated by the electromagnetic overflow valve 74, and when the oil supply pressure gauge 64 indicates 5.0MPa, it means that the system pressure is normal.

Slide table fast-forward oil circuit: Start the fast-forward control button, electromagnets 1DT and 2DT are energized at the same time, and the pressure oil enters the right chamber of the thrust cylinder 78 through the electromagnetic reversing valve 76; at the same time, the pressure oil in the left chamber of the thrust cylinder 78 passes through the one-way Valve 75 flows back to the oil tank (unloading), and the working slide table is fast forwarded to the left.

Sliding table worker oil inlet circuit: When the working sliding table moves to the preset position of the travel switch, the electromagnet 2DT is de-energized, 3DT is energized, and the pressure oil passes through the pressure reducing valve 71, the flow control valve 72, and the electromagnetic reversing valve 73 It flows into the right cavity of the thrust cylinder and turns into the working state; the working speed is regulated by the flow control valve 72, and the welding pressure is regulated by the pressure reducing valve 71, and its value is displayed by the pressure gauge 7.

Upsetting oil circuit: When the pressure oil reaches the pre-set working pressure of the pressure relay 81, the pressure relay operates, 3DT is de-energized, 4DT is energized, and enters the fast upsetting state; the upsetting speed is adjusted through the flow control valve 69, and the upsetting The forging pressure is regulated by a pressure reducing valve 68, and its value is displayed by a pressure gauge 66.

Sliding table quick return oil circuit: After a certain period of delay in upsetting pressure holding, electromagnet 4DT is de-energized, 5DT is energized, and the working slide table quickly retreats, resets, and enters the next working cycle.

In order to ensure the reliability of the hydraulic control system, the oil supply filter uses a filter with high dirt-holding capacity (β≥200) and high filtration precision (10μ).

The main technical parameters of the hydraulic control system are: rated pressure, 50bar; working pressure adjustment range, 35-50bar; system rated flow, 12L/min; oil tank effective volume, 100L; working medium, VG32 or VG46 high anti-wear hydraulic oil; motor Power, 1.5KW; Voltage, 380VAC; Frequency, 50Hz.

3. Computer measurement and control system:

Referring to Fig. 8 and Fig. 9, the computer measurement and control system is mainly composed of man-machine interface, programmable logic controller (PLC), frequency converter 88, sensors and low-voltage electrical appliances, among which: PLC is the control center of the system, and the sequence control and mutual The lock protection and the functional coordination of each part are completed by it; the man-machine interface is a window for man-machine dialogue, which is used for welding machine operation, parameter setting and online modification, and welding machine running status display; the frequency converter is used for welding machine spindle The speed regulation of the drive and its speed; the sensor is used for the real-time detection of the welding machine spindle speed, the axial shortening of the workpiece and the liquid level of the oil mist generator, and the limit of the stroke of the working slide; low-voltage electrical appliances include circuit breakers, relays, and contactors wait. Figure 10 shows the computer control flowchart of the utility model.

The PLC controller of this utility model selects the products of Mitsubishi Corporation of Japan, and the main components of the configuration include: FX _IN -24MR-001 type host; FX _2N -2AD type A/D module (12-bit analog input, 1 ~ 5V); F930GOT- BWD-C type touch display and FX-50DU-CABO type touch display cable, etc. The flywheel speed is detected by the frequency converter in real time, and the axial deformation of the workpiece is detected by the WDYC-10L differential transformer displacement sensor (12VDC power supply, 0-5VDC output, range 10mm) for real-time detection.

In actual work, after the computer measurement and control system is powered on, the man-machine interface performs a self-inspection, and enters the "operation screen" after the self-inspection is completed; there are multiple function buttons on the operation panel, mainly including: manual/automatic operation mode conversion, hydraulic pump Start/stop, hydraulic pressure establishment/cancellation, slide table fast forward/work forward/fast reverse, clutch engagement/disengagement, upsetting, and welding machine spindle rotation/stop, etc.; for the implementation of program control and electrical interlock protection, it is also configured The pressure relay, slide limit travel switch used to indicate that the workpiece is in contact, and the water pressure relay, air pressure relay, lubricator liquid level monitoring sensor, etc. used for working condition monitoring.

When the "manual/automatic" button on the human-machine interface is switched to the manual mode, the hydraulic pump can be started/stopped, the hydraulic pressure is established/cancelled, the slide table is fast forwarded/worked/reversed, the clutch is engaged/disengaged, and the welding machine spindle is stopped. , Upsetting and other operations; when switching to automatic mode, the whole system is converted to automatic operation, and its control flow is shown in Figure 10.

Parameters such as the rotating speed of the welding machine spindle, the working time of the sliding table, and the pressure holding time of the upsetting can be set and modified online.

The main performance parameters of the utility model miniature high-speed inertial friction welding machine are as follows:

①Spindle speed: 10000-50000rpm (adjustable);

②Minimum moment of inertia of main shaft: 3.2×10 ^-5 kgm ² ;

③Maximum welding force: 5.0KN;

④Weldment diameter range (bar): φ1.5-φ5.0mm;

⑤Weldment length: rotating end, 20-30mm; moving end, 20-50mm;

⑥Dynamic accuracy of welding machine: the radial runout of the main shaft is ≤0.015mm, and the axial movement is ≤0.020mm;

⑦Radial runout of rotating fixture: ≤0.035mm;

⑧Concentricity deviation between the moving fixture axis and the spindle axis: ≤0.05mm.

Claims (7)

1. A miniature high-speed inertial friction welding machine is characterized in that: comprise the welder main shaft (3) that is installed on the lathe bed (10), work slide table (12) is connected with thrust oil cylinder (9), electric main shaft (1 ) is connected with the welding machine main shaft (3) and the flywheel (4) installed on the welding machine main shaft (3) through the electromagnetic clutch (2), the rotating fixture (5) is connected with the welding machine main shaft (3), and the moving fixture (8) Installed on the work slide (12), the electric spindle (1) is connected with a frequency converter and a sensor, and the frequency converter and the sensor are connected with the controller. 2. The miniature high-speed inertial friction welding machine according to claim 1, characterized in that: the electric spindle (1) is supported by angular contact ball bearings. 3. The miniature high-speed inertial friction welding machine according to claim 2, characterized in that: the rotating fixture (5) and the moving fixture (8) adopt miniature precision collets. 4. The miniature high-speed inertial friction welding machine according to claim 3, characterized in that: the guide rail of the working slide table (12) adopts a linear guide rail with high guiding precision. 5. The miniature high-speed inertial friction welding machine according to claim 4, characterized in that: the bearing of the electric spindle (1) and the bearing of the welding machine spindle (3) are connected with the oil mist generator (43). 6. The miniature high-speed inertial friction welding machine according to claim 5, characterized in that: the electromagnetic clutch (2) includes an outer sleeve (49), and the end cover plate (53) is connected with the outer sleeve (49) to form a housing , the casing is equipped with an excitation coil (50), the excitation coil (50) is connected to the coil frame (51), the magnetic ring (47) is made of rare earth strong permanent magnet material NdFeB material, and is glued to the left and right sides On the annular boss of the end cover plate (53), a rubber washer (52) is glued on the end surface of the magnetic ring (47), and the middle hole of the left end cover plate (53) is provided with an outer ring connected to the shaft body of the electric spindle (1). Splined shaft (46), the outer splined shaft (54) that links to each other with the welder main shaft (3) axle body that flywheel (4) is installed in the middle hole of right end cover plate (53), outer splined shaft ( 54) and the inner spline sleeve (48) on one side of the outer spline shaft (46) and the magnetic ring (47) are splined, and the inner spline sleeve (48), the end cover plate (53), the outer sleeve ( 49) are made of magnetically conductive material, the external spline shaft (46) and the external spline shaft (54) are made of non-magnetically conductive material, the excitation coil (50) is connected with the DC power supply through a relay, and the relay is connected with a voltage Sensitive resistor (58). 7. The miniature high-speed inertial friction welding machine according to claim 6, characterized in that: the controller is a programmable controller, and the man-machine interface is connected with the programmable controller.

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