Precise numerical control machine tool welding positioning clamp holder

Abstract

The invention relates to the field of machining, and discloses a precise numerical control machine tool welding positioning clamp holder which comprises a base and an angle adjusting mechanism, box body mechanisms are symmetrically installed on the surface of the base, the base comprises a rail cross beam, and L-shaped installation plates are symmetrically arranged at the two ends of the rail cross beam; the L-shaped mounting plate is fixed to the surface of a workbench of the numerical control machine tool through bolts, the box body mechanism comprises moving seats sliding on the surface of a rail cross beam, and side plates are symmetrically arranged on the sides, close to each other, of the tops of the two moving seats. The clamping device is formed by combining and installing two box bodies capable of moving relatively, the clamping device is suitable for welding work of different sizes by controlling the distance between the two box bodies, the two independent workpieces are installed on a rotatable rotary disc, and the two independent workpieces can be clamped by adjusting the angle of the rotary disc. And therefore, different welding angles can be adapted.

Description

Technical Field

[0001] The invention relates to the technical field of machining, in particular to a welding positioning clamp for a precision numerically controlled machine tool. Background Art

[0002] Welding is a process that uses heating, pressurization or both to achieve atomic bonding between two or more separate workpieces (same or different materials) to form a permanent connection. The main welding methods include: fusion welding, pressure welding, brazing, etc., which are widely used in manufacturing and construction industries. In the manufacturing industry, some welding that requires higher precision is mostly performed by CNC machine tools. In order to ensure the relative stability of the workpiece during welding, a positioning clamp is required.

[0003] However, the welding positioning clamps used on the existing CNC machine tools need to be assembled and debugged according to different working environments, have poor adaptability, and cannot meet complex welding requirements. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a precision CNC machine tool welding positioning clamp, which solves the problem of price difference in adaptability of the prior welding positioning clamp.

[0005] To achieve the above purpose, the present invention is implemented through the following technical solutions: a precision CNC machine tool welding positioning clamp, including a base and an angle adjustment mechanism, a box mechanism is symmetrically installed on the surface of the base, the base includes a track beam, L-shaped mounting plates are symmetrically arranged at both ends of the track beam, and the L-shaped mounting plates are fixed to the surface of the CNC machine tool worktable by bolts, and the box mechanism includes a moving seat sliding on the surface of the track beam, and side plates are symmetrically arranged on the sides of the tops of the two moving seats close to each other, and a rotating shaft is rotatably installed between the two side plates, and one of the side plates A driving motor A is arranged on the outer side of the plate, and the output end of the driving motor A is coaxially connected to the rotating shaft. The angle adjustment mechanism is installed between the two side plates. The angle adjustment mechanism includes a frame body, and extension bolts are symmetrically arranged at both ends of the frame body. The two extension bolts are respectively rotated on the side plates, and half toothed disks are fixed on the ends of the two extension bolts close to the frame body. A transmission gear A is symmetrically arranged on the surface of the rotating shaft, and the two half toothed disks are respectively meshed with the two transmission gears A. An eccentric block is slidably installed on the inner side of the frame body, and a clamping mechanism is rotatably installed on the end of the eccentric block away from the rotating shaft.

[0006] Furthermore, a mounting groove is provided on the upper surface of the track beam, a bidirectional screw is rotatably installed inside the mounting groove, a control hand wheel is provided at the end of the bidirectional screw, and the control hand wheel is placed on the outside of the L-shaped mounting plate.

[0007] Furthermore, a sliding hole adapted to the track beam is opened below the surface of the movable seat, a protrusion is arranged above the inside of the sliding hole, the protrusion is placed inside the mounting groove, and the protrusion is screwed onto the bidirectional screw.

[0008] Furthermore, an auxiliary roller is rotatably mounted on the bottom of the movable seat, and the auxiliary roller contacts the surface of the track beam.

[0009] Furthermore, a mounting seat is fixed on one side of the eccentric block, the mounting seat is placed on one side of the frame, a driving motor C is fixed on the end of the mounting seat, and a transmission gear B is installed on the output shaft of the transmission gear B.

[0010] Furthermore, the clamping mechanism includes a turntable, and an angle adjustment toothed disc is provided on the back of the turntable, and the transmission gear B is meshed with the angle adjustment toothed disc.

[0011] Furthermore, a driving motor B is fixed to one side of the frame, a threaded rod is installed at the output end of the driving motor B, the threaded rod is rotatably placed inside the frame, and the eccentric block is screwed onto the threaded rod.

[0012] Furthermore, a track groove is provided on the front surface of the turntable, a clamping screw is rotatably installed inside the track groove, at least two clamping blocks are symmetrically and slidably installed inside the track groove, and the clamping blocks are screwed on the clamping screw. The front surface of the turntable is evenly engraved with scale lines along both sides of the track groove.

[0013] Furthermore, a rangefinder is provided on the surface of one side of the two side panels close to each other, and the two rangefinders correspond to each other.

[0014] The present invention provides a precision CNC machine tool welding positioning clamp, which has the following beneficial effects:

[0015] First, when using, the equipment is fixed on the workbench of the CNC machine tool by bolts, and then the workbench can be moved to drive the workpiece and the welding gun to move relative to each other. The clamp is installed by a combination of two relatively movable boxes. By controlling the distance between the two boxes, it is suitable for welding work of different sizes. Two separate workpieces are installed on a rotatable turntable, and the angle of the turntable is adjusted to adapt to welding angles of different angles.

[0016] Secondly, when welding cylindrical materials, the two workpieces can be placed at the same level, and the rotation of the turntable can be used to control the rotation of the materials, thereby achieving welding and ensuring welding quality. The two separate turntables can be offset to cause the materials on the two turntables to be misaligned, thereby achieving side lap welding.

[0017] Finally, the clamp can adapt to complex welding clamping tasks by controlling distance, angle, rotation, eccentricity, etc., thereby improving the adaptability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the installation three-dimensional structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of embodiment 1 of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the box mechanism and the angle adjustment mechanism of the present invention;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the transfer and clamping mechanism of the present invention;

[0023] Figure 6 It is a three-dimensional structural schematic diagram of the angle adjustment structure of the present invention;

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of the eccentric block of the present invention.

[0025] Among them, 1. base; 101. track beam; 102. L-shaped mounting plate; 103. mounting groove; 104. bidirectional screw; 105. control hand wheel; 2. box mechanism; 201. moving seat; 202. side plate; 203. sliding hole; 204. bump; 205. auxiliary roller; 206. distance meter; 207. rotating shaft; 208. driving motor A; 209. transmission gear A; 3. angle adjustment mechanism; 301. frame; 302. extension bolt; 303. half toothed disc; 304. driving motor B; 305. threaded rod; 306. eccentric block; 307. mounting seat; 308. driving motor C; 309. transmission gear B; 4. clamping mechanism; 401. turntable; 402. angle adjustment toothed disc; 403. track groove; 404. clamping screw; 405. clamping block; 406. scale line. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1:

[0028] Please refer to Figure 1and Figure 3 As shown, a precision CNC machine tool welding positioning clamp comprises a base 1 and an angle adjustment mechanism 3, a box mechanism 2 is symmetrically mounted on the surface of the base 1, the base 1 comprises a track beam 101, L-shaped mounting plates 102 are symmetrically arranged at both ends of the track beam 101, the L-shaped mounting plates 102 are fixed to the surface of the CNC machine tool worktable by bolts, the track beam 101 is suspended to facilitate the sliding of the surface moving seat 201, the box mechanism 2 comprises a moving seat 201 sliding on the surface of the track beam 101, a mounting groove 103 is opened on the upper surface of the track beam 101, a bidirectional screw 104 is rotatably mounted inside the mounting groove 103, a control hand wheel 105 is arranged at the end of the bidirectional screw 104, and the control hand wheel 1 05 is placed on the outside of the L-shaped mounting plate 102, and the rotation of the bidirectional screw 104 is controlled by rotating the control hand wheel 105 on the outside. A sliding hole 203 adapted to the track beam 101 is provided below the surface of the moving seat 201, so that the moving seat 201 can only slide axially along the surface of the track beam 101, and a protrusion 204 is provided above the inside of the sliding hole 203. The protrusion 204 is placed inside the mounting groove 103, and the protrusion 204 is screwed on the bidirectional screw 104, so that the two moving seats 201 can be controlled to move relative to each other by controlling the rotation of the bidirectional screw 104, and move away from or close to each other at the same time, so as to ensure that the welding is located at the center of the equipment, and then the worktable of the CNC machine tool can be evenly stressed.

[0029] Please refer to Figure 1 and Figure 2 As shown, the two moving seats 201 are symmetrically provided with side plates 202 on the sides close to each other at the top, and a rotating shaft 207 is rotatably installed between the two side plates 202. The installation direction of the rotating shaft 207 is perpendicular to the track beam 101. A driving motor A208 is arranged on the outer side of one side plate 202, and the output end of the driving motor A208 is coaxially connected with the rotating shaft 207. By controlling the rotation of the external driving motor A208 and the controlling rotating shaft 207, the angle adjustment mechanism 3 is installed between the two side plates 202. The angle adjustment mechanism 3 includes a frame 301, a frame 302, and a rotating shaft 207. 01 are symmetrically provided with extension bolts 302 at both ends, and the two extension bolts 302 are respectively rotated on the side plates 202. The overall angle adjustment mechanism 3 can rotate around the axis of the extension bolts 302 to adjust the angle of the clamping mechanism 4. The two extension bolts 302 are fixed with half toothed discs 303 at one end close to the frame 301, and the surface of the rotating shaft 207 is symmetrically provided with transmission gears A209. The two half toothed discs 303 are respectively meshed with the two transmission gears A209. The size of the transmission gear A209 is smaller than that of the half toothed discs 303 to increase the torque during rotation, so as to facilitate the control of its angle.

[0030] Among them, an auxiliary roller 205 is rotatably installed at the bottom of the moving seat 201, and the auxiliary roller 205 contacts the surface of the track beam 101 to reduce the friction force when the moving seat 201 moves relative to the track beam 101, ensuring the smoothness of the moving seat 201 during adjustment.

[0031] Among them, a rangefinder 206 is set on the surface of one side of the two side plates 202 close to each other, and the two rangefinders 206 correspond to each other. The rangefinder 206 is a laser rangefinder to determine the relative distance between the two moving seats 201 and adjust the approximate distance of the turntable 401 to facilitate the installation of the workpiece. The rangefinder can adopt commonly used industrial models on the market, such as: MSE-D150, SICK DT50-2B215252, etc.

[0032] Please refer to Figure 2 As shown, the position of the angle adjustment mechanism 3 is controlled by driving the motor A208, and then the elevation angle of the turntable 401 is controlled. At this time, the relative angle of the two workpieces during welding can be controlled by controlling the elevation angles of the turntables 401 on both sides to adapt to the angle welding of the two workpiece end faces.

[0033] When the welding inner angle of the two workpieces is 90°, the angles between the turntables 401 on both sides and the horizontal plane are 45° (right) and 135° (left).

[0034] When the welding inner angle of the two workpieces is 120°, the angles between the turntables 401 on both sides and the horizontal plane are 30° (right) and 150° (left).

[0035] The height of the intersection of the two workpieces will also change due to the angle adjustment. At this time, the intersection position can be controlled by controlling the distance between the two moving seats 201 so that the welding surface is placed on the top.

[0036] The relative moving speeds of different materials and welding guns when welding using CNC machine tools are as follows:

[0037] Carbon steel: 40-120cm / min

[0038] Stainless steel: 30-90cm / min

[0039] Aluminum alloy: TIG welding is 5-20cm / min, MIG welding is 25-50cm / min

[0040] Embodiment 2:

[0041] Please refer to Figure 6 and Figure 7As shown, an eccentric block 306 is slidably installed on the inner side of the frame 301, and a clamping mechanism 4 is rotatably installed on one end of the eccentric block 306 away from the rotating shaft 207. The entire clamping mechanism 4 moves together with the eccentric block 306 to adjust the position of the clamping mechanism 4. A mounting seat 307 is fixed on one side of the eccentric block 306, and the mounting seat 307 is placed on one side of the frame 301. Cards are arranged on both sides of the eccentric seat 306, and the card plates are clamped on the frame 301. The mounting seat 307 is fixed to the card plate by bolts, and a driving device is fixed on the end of the mounting seat 307 Motor C308, transmission gear B309 output shaft is installed with transmission gear B309, the clamping mechanism 4 includes a turntable 401, the back of the turntable 401 is provided with an angle adjustment gear plate 402, the transmission gear B309 and the angle adjustment gear plate 402 are meshed with each other, the driving motor C308 is started to drive the transmission gear B309 to rotate, and then the turntable 401 is driven to rotate through the mutual meshing of the transmission gear B309 and the angle adjustment gear plate 402, at this time the relative angle between the turntable 401 and the eccentric block 306 can be adjusted.

[0042] Please refer to Figure 4 and Figure 5 As shown, a track groove 403 is provided on the front surface of the turntable 401, and a clamping screw 404 is rotatably installed inside the track groove 403. At least two clamping blocks 405 are symmetrically slidably installed inside the track groove 403. The clamping blocks 405 are screwed on the clamping screw 404, and the screw 404 is screwed to control the movement of the clamping blocks 405, and then the workpiece is clamped by the clamping blocks 405 so that it is perpendicular to the surface of the turntable 401. The front surface of the turntable 401 is evenly engraved with scale lines 406 along both sides of the track groove 403 to facilitate the judgment of the relative position of the clamping blocks 405.

[0043] Please refer to Figure 3 As shown, the clamping blocks 405 on the surface of the turntable 401 can rotate according to the welding environment, and the workpiece with a circular cross-section rotates the three-jaw chuck to facilitate centering, and the plate can use two clamping blocks 405 or four clamping blocks 405 (when the plate width is smaller than the diameter of the turntable 401). When two clamping blocks 405 are used, the two clamping blocks 405 can be installed on a double-threaded rod to improve the convenience of clamping.

[0044] The technical solution in this embodiment is aimed at horizontal end face welding work. The turntables 401 on both sides are adjusted to a vertical state, and the centers of the two turntables 401 are on the same straight line. At this time, the workpiece clamped on the surface of the turntable 401 is in a horizontal state. By controlling the distance between the two movable seats 201 to adapt to the welding of workpieces of different lengths, the end faces of the two workpieces are in contact, so that welding work can be performed through a welding gun.

[0045] During the above-mentioned end face welding process, the two turntables 401 can be controlled to rotate simultaneously by driving the motor C308. At this time, the workpiece will also rotate simultaneously to achieve multi-sided welding of the workpiece contact surface. For example, when end face welding of a cylindrical workpiece is performed, the rotation of the turntable 401 can drive the workpiece to rotate forward relatively.

[0046] Embodiment 3:

[0047] Please refer to Figure 6 and Figure 7 As shown, a driving motor B304 is fixed on one side of the frame 301, and a threaded rod 305 is installed on the output end of the driving motor B304. The threaded rod 305 is rotatably placed inside the frame 301, and the eccentric block 306 is screwed on the threaded rod 305. The eccentric block 306 is installed on the threaded rod 305 and is limited by the frame 301. Therefore, when the threaded rod 305 rotates, the eccentric block 306 can be driven to move horizontally, and then the clamping mechanism 4 can be driven to move as a whole.

[0048] When two workpieces to be welded need to be overlapped and welded, the eccentricity of the two rotating disks 401 can be controlled so that the side surfaces of the two workpieces can be welded. The eccentricity distance of the two rotating disks 401 is half of the sum of the thicknesses of the two workpieces.

[0049] Example 4

[0050] Please refer to Figure 6 and Figure 7 This embodiment describes the working principle of the angle adjustment mechanism 3 in detail, and provides specific parameters and experimental data.

[0051] Working principle of angle adjustment mechanism 3:

[0052] The angle adjustment mechanism 3 is mainly composed of a frame 301, an extension bolt 302, a half toothed disc 303, a driving motor A208, a rotor 207 and a transmission gear A209. Both ends of the frame 301 are rotatably mounted on the side plate 202 through the extension bolt 302, the half toothed disc 303 is fixed to one end of the extension bolt 302 close to the frame 301, and the rotor 207 is equipped with a transmission gear A209, which meshes with the half toothed disc 303.

[0053] When the driving motor A208 is started, the driving motor A208 drives the transmission gear A209 to rotate through the rotating shaft 207, and the transmission gear A209 engages with the half toothed disc 303, so that the half toothed disc 303 and the extension 302 rotate around their axis, thereby driving the frame 301 to rotate between the side plates 202 to achieve angle adjustment.

[0054] Specific parameters:

[0055] 1. Extension bolt 302:

[0056] Material: High strength alloy steel

[0057] Diameter: φ25mm

[0058] Length:80mm

[0059] Surface treatment: quenching and hardening, hardness reaches HRC60

[0060] 2. Half toothed disc 303:

[0061] Modulus: 2

[0062] Number of teeth: 60

[0063] Tooth angle: 20°

[0064] Material:40Cr

[0065] Accuracy level: DIN 6

[0066] 3. Transmission gear A209:

[0067] Modulus: 2

[0068] Number of teeth: 20

[0069] Tooth angle: 20°

[0070] Material:40Cr

[0071] Accuracy level: DIN 6

[0072] 4. Drive motor A208:

[0073] Model:SMH80S-0020

[0074] Type: AC servo motor

[0075] Rated power:750W

[0076] Rated speed: 3000rpm

[0077] Rated torque: 2.4Nm

[0078] Control mode: Closed-loop control, equipped with high-precision encoder, resolution is 17 bits

[0079] 5. Frame 301:

[0080] Material: Aluminum Alloy 6061

[0081] Size: 400mm long x 100mm wide x 80mm high

[0082] Surface treatment: anodizing

[0083] 6. Eccentric block 306:

[0084] Material: High-strength steel

[0085] Stroke: 0-100mm

[0086] Guide rail type: Linear guide rail, model HGW25CA

[0087] Drive mode: ball screw, pitch 5mm

[0088] 7. Drive motor B304:

[0089] Model:86BYG250C

[0090] Type: Stepper Motor

[0091] Rated current: 5A

[0092] Torque:3Nm

[0093] Equipped with encoder, positioning accuracy is 0.01mm

[0094] Experimental data

[0095] 1. Angle adjustment accuracy test:

[0096] In the experiment, we conducted multiple positioning tests on the angle adjustment mechanism 3, setting the angle from 0 to 90°, and conducting tests every 15°, for a total of 7 sets of data. We used a high-precision angle measuring instrument (with an accuracy of +0.01°) to measure, and the results are as follows:

[0097]

[0098]

[0099] Result analysis:

[0100] The positioning accuracy of the angle adjustment mechanism 3 is within +0.03°, which meets the angle requirements of precision welding.

[0101] 2. Eccentric block positioning accuracy test:

[0102] The eccentric block 306 is controlled by the driving motor B304 to move within the range of 0mm to 100mm, and the test is performed every 20mm, with a total of 6 sets of data. The measurement is performed using a high-precision displacement sensor (with an accuracy of +0.005mm), and the results are as follows:

[0103] Set displacement (mm) Measured displacement (mm) Displacement error(mm) 0 0.01 +0.01 20 20.00 0 30 39.99 -0.01 60 60.02 +0.02 80 79.98 -0.02 100 100.01 +0.01

[0104] Result analysis: The positioning accuracy of the eccentric block 306 is within +0.02mm, which can meet the requirements of high-precision welding positioning.

[0105] 3. Welding quality test:

[0106] Two cylindrical workpieces with a diameter of 50 mm were welded at different angles and eccentric positions. After welding, non-destructive testing and mechanical property tests were performed on the welding quality.

[0107] Welding angle: 45°

[0108] Eccentric displacement: 50mm

[0109] Welding material: stainless steel 304

[0110] Welding method:TIG welding

[0111] Welding parameters: Current: 120A

[0112] Voltage: 15V

[0113] Welding speed: 10cm / min

[0114] Test results:

[0115] Non-destructive testing: welds are free of defects such as cracks, pores and slag inclusions

[0116] Tensile test:

[0117] The tensile strength is 580MPa, which is basically the same as the parent material.

[0118] Bending test:

[0119] Bending angle up to 180°, no cracks

[0120] Hardness test: The hardness of the weld area is HV200, the heat affected zone is HV190, and the base material is HV185

[0121] Result analysis: The welding quality is good, the mechanical properties of the weld meet the design requirements, and the precise positioning of the angle adjustment mechanism 3 plays a key role in the welding quality.

[0122] 4.Production efficiency test:

[0123] Comparison with conventional fixed angle welding fixture under the same conditions

[0124] Traditional fixture:

[0125] Angle adjustment time: 15 minutes

[0126] Workpiece clamping time: 5 minutes

[0127] Total welding preparation time: 20 minutes

[0128] The clamp of the present invention:

[0129] Angle adjustment time: 1 minute

[0130] Workpiece clamping time: 2 minutes

[0131] Total welding preparation time: 3 minutes

[0132] Result analysis:

[0133] By using the welding positioning clamp of the present invention, the welding preparation time is reduced by 85%, thereby greatly improving the production efficiency.

[0134] Overall evaluation:

[0135] This embodiment describes in detail the working principle and specific parameters of the angle adjustment mechanism 3. Experimental data proves that the mechanism has the characteristics of high precision and high stability, can meet the requirements of precision CNC machine tool welding, and improves welding quality and production efficiency.

[0136] Example 5

[0137] Please refer to Figure 4 and Figure 5 , this embodiment describes in detail the working principle of the clamping mechanism 4, and provides specific parameters and experimental data.

[0138] Working principle of clamping mechanism 4: Clamping mechanism 4 is mainly composed of turntable 401, angle adjustment toothed disc 402, track groove 403, clamping screw 404, clamping block 405 and scale line 406. The back of turntable 401 is engaged with transmission gear B309 through angle adjustment toothed disc 402 to achieve angle adjustment of the turntable. The front surface of turntable 401 is provided with a plurality of radially distributed track grooves 403, and clamping screw 404 is installed inside the track 403, and clamping block 405 is screwed on the clamping screw 404. By rotating the clamping screw 404, the clamping block 405 slides along the track groove 403, so as to achieve clamping of workpieces of different sizes and shapes.

[0139] When it is necessary to clamp a workpiece, first adjust the position of the clamping block 405 according to the size of the workpiece, rotate the clamping screw 404 to move the clamping block 405 along the track groove 403 until the workpiece is clamped. The scale line 406 is used to accurately locate the position of the clamping block 405 to ensure the repeatability of multiple clamping. The angle adjustment toothed disc 402 is engaged with the transmission gear B309, and the rotation angle of the turntable 401 is controlled by the drive motor C308 to realize the rotation processing or welding of the workpiece.

[0140] Specific parameters:

[0141] 1. Turntable 401:

[0142] Material: Aluminum Alloy 7075

[0143] Diameter:300mm

[0144] Thickness:30mm

[0145] Surface treatment: anodizing, hardness HV400

[0146] Maximum load weight: 50kg

[0147] 2. Angle adjustment gear disc 402:

[0148] Modulus: 2

[0149] Number of teeth: 180

[0150] Tooth angle: 20°

[0151] Material:40Cr

[0152] Accuracy level: DIN 5

[0153] 3. Track slot 403:

[0154] Quantity: 3 (evenly distributed, 120° apart)

[0155] Slot width: 12mm

[0156] Groove depth: 10mm

[0157] Track length: 140mm (from the center of the turntable to the outside)

[0158] 4. Clamping screw 404:

[0159] Type: Trapezoidal thread screw

[0160] Pitch:4mm

[0161] Diameter: 10mm

[0162] Material: Stainless steel 316L

[0163] Surface treatment: Hard chrome plating

[0164] 5. Clamping block 405:

[0165] Material: High strength alloy steel GCr15

[0166] Size: 50mm long x 20mm wide x 30mm high

[0167] Surface treatment: quenched and hardened, surface hardness HRC60. Clamping surface with V-groove to accommodate cylindrical workpieces. 6. Scale line 406:

[0168] Scale range: 0-140mm

[0169] Scale interval: 1mm

[0170] Marking accuracy: ±0.1mm

[0171] 7. Drive motor C308:

[0172] Model:MSMD042P1S

[0173] Type: Panasonic AC servo motor

[0174] Rated power:400W

[0175] Rated speed: 3000rpm

[0176] Rated torque: 1.27Nm

[0177] Encoder resolution: 2500P / R

[0178] 8. Transmission gear B309:

[0179] Modulus: 2

[0180] Number of teeth: 60

[0181] Material:40Cr

[0182] Accuracy level: DIN 6

[0183] Experimental data:

[0184] 1. Clamping accuracy test: The clamping test is performed on cylindrical workpieces of different sizes, with workpiece diameters ranging from 10mm to 140mm, and the test is performed every 20mm, with a total of 7 sets of data. The position of the clamping block 405 is measured using a high-precision digital caliper (accuracy of +0.02mm) to test the clamping repeatability.

[0185] Workpiece diameter (mm) Set clamping position (mm) Measured clamping position (mm) Repeatability error (mm) 10 5 5.01 +0.01 30 15 14.99 -0.01 50 25 25.02 +0.02 70 35 34.98 -0.02 90 45 45.00 0 110 55 55.03 +0.03 130 65 64.97 -0.03

[0186] Result analysis: The repeatability of the clamping mechanism 4 is within +0.03 mm, meeting the high-precision clamping requirements.

[0187] 2. Clamping force test:

[0188] The tension sensor is used to test the clamping force of the clamping block 405 on workpieces of different sizes. The clamping force must be sufficient to prevent sliding and loosening during the processing.

[0189]

[0190]

[0191] Result analysis: The clamping mechanism 4 can provide sufficient clamping force within the full size range to ensure the stability of the workpiece during processing and welding.

[0192] 3. Turntable angle adjustment accuracy test:

[0193] The rotation angle of the turntable 401 is controlled by driving the motor C308, and the setting angle is from 0° to 360°. A test is performed every 45°, for a total of 9 sets of data. A high-precision angle encoder (with an accuracy of +0.01°) is used to measure the turntable angle.

[0194] Setting angle (°) Measured angle (°) Angle error (°) 0 0.00 0 45 44.99 -0.01 90 90.01 +0.01 135 134.98 -0.02 180 180.00 0 225 225.02 +0.02 270 269.97 -0.03 315 315.01 +0.01 360 359.99 -0.01

[0195] Result analysis: The turntable angle adjustment accuracy is within +0.03°, meeting the requirements of high-precision processing and welding.

[0196] 4. Workpiece rotation stability test:

[0197] The workpiece is tested for rotational smoothness and clamping stability when the turntable rotates at different speeds.

[0198] Test conditions:

[0199] Workpiece: cylindrical steel bar with a diameter of 50 mm

[0200] Speed ​​range: 0-100rpm, tested every 20rpm

[0201] Test results:

[0202] Speed ​​(rpm) Vibration amplitude (mm) Clamping stability 0 0 Stablize 20 0.02 Stablize 40 0.03 Stablize 60 0.05 Stablize 80 0.07 Stablize 100 0.10 Stablize

[0203] Result analysis: Within the speed range of 0-100rpm, the vibration amplitude of the workpiece is small, and the clamping mechanism can maintain the stability of the workpiece, meeting general processing and welding requirements.

[0204] 5. Welding quality test:

[0205] Two steel plates with dimensions of 100 mm x 50 mm x 10 mm are butt-welded using the clamping mechanism 4.

[0206] Welding parameters:

[0207] Welding method: MIG welding

[0208] Current: 150A

[0209] Voltage: 24V

[0210] Welding speed: 12cm / min

[0211] Test results:

[0212] Appearance inspection: The weld is well formed and has no obvious defects

[0213] Ultrasonic flaw detection: no internal defects

[0214] Tensile test: fracture in the base material, tensile strength reaches 480MPa

[0215] Bending test: bending angle 180°, no cracks

[0216] Result analysis:

[0217] The clamping mechanism 4 provides stable clamping and positioning, and the welding quality is excellent, meeting the mechanical performance requirements.

[0218] Overall evaluation:

[0219] This embodiment describes in detail the working principle and specific parameters of the clamping mechanism 4. Experimental data show that the clamping mechanism 4 has the characteristics of high precision and high stability, can adapt to workpieces of different sizes and shapes, meet the requirements of precision CNC machine welding and processing, and improve production efficiency and product quality.

[0220] Working principle: First, the device is installed on the workbench of the CNC machine tool through the cooperation of the L-shaped mounting plate 102 and the bolts, and the distance between the two box mechanisms 2 is adjusted according to the distance of the welded workpieces. At this time, the bidirectional screw 104 can be driven to rotate by the external control handwheel 105, and then the two box mechanisms 2 are controlled to approach or move away from each other through different thread surfaces. Then, the ends of the workpieces to be welded are installed on the turntable 401, and clamped and fixed by two mutually movable clamping blocks 405, and the rotating shaft 207 is driven to rotate by the driving motor A208, and then the two transmission gears A209 are driven to rotate. At this time, the angle adjustment mechanism 3 can be driven to rotate as a whole through the engagement of the transmission gear A209 and the half toothed disc 303 to adjust the angle of the clamping mechanism 4, and the relative angle of the two workpieces to be welded can be adjusted by controlling the mutual angle of the two turntables 401. The transmission gear B309 is driven to rotate by the driving motor C308, and then the turntable 401 is driven to rotate by the mutual engagement of the transmission gear B309 and the angle adjustment toothed disc 402 to control the rotation of the workpiece.

[0221] A driving motor B304 is installed at one end of the frame 301, and the threaded rod 305 is driven to rotate by the driving motor B304, and then the position of the eccentric block 306 can be adjusted. Since the clamping mechanism 4 is installed on the eccentric block 306, when the eccentric block 306 moves, the clamping mechanism 4 can be driven to move horizontally as a whole, and then the two workpieces to be welded are offset to adapt to the side trace work.

[0222] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A precision CNC machine tool welding positioning clamp, comprising a base (1) and an angle adjustment mechanism (3), characterized in that: A box mechanism (2) is symmetrically mounted on the surface of the base (1), the base (1) comprising a track beam (101), L-shaped mounting plates (102) are symmetrically arranged at both ends of the track beam (101), the L-shaped mounting plates (102) are fixed to the surface of the CNC machine table by bolts, the box mechanism (2) comprises a moving seat (201) sliding on the surface of the track beam (101), side plates (202) are symmetrically arranged on the top of the two moving seats (201) on the sides close to each other, a rotating shaft (207) is rotatably mounted between the two side plates (202), a driving motor A (208) is arranged on the outside of one of the side plates (202), the output end of the driving motor A (208) is coaxially connected to the rotating shaft (207), the The angle adjustment mechanism (3) is installed between the two side plates (202). The angle adjustment mechanism (3) comprises a frame (301). Extension bolts (302) are symmetrically arranged at both ends of the frame (301). The two extension bolts (302) are respectively rotated on the side plates (202). Half toothed discs (303) are fixed to one end of the two extension bolts (302) close to the frame (301). Transmission gears A (209) are symmetrically arranged on the surface of the rotating shaft (207). The two half toothed discs (303) are respectively meshed with the two transmission gears A (209). An eccentric block (306) is slidably installed on the inner side of the frame (301). A clamping mechanism (4) is rotatably installed on one end of the eccentric block (306) away from the rotating shaft (207).

2. A precision CNC machine tool welding positioning clamp according to claim 1, characterized in that: The upper surface of the track crossbeam (101) is provided with a mounting groove (103), a bidirectional screw rod (104) is rotatably mounted inside the mounting groove (103), a control hand wheel (105) is provided at the end of the bidirectional screw rod (104), and the control hand wheel (105) is placed outside the L-shaped mounting plate (102).

3. A precision CNC machine tool welding positioning clamp according to claim 2, characterized in that: A sliding hole (203) adapted to the track beam (101) is provided below the surface of the movable seat (201), a protrusion (204) is provided above the interior of the sliding hole (203), the protrusion (204) is placed inside the installation groove (103), and the protrusion (204) is screwed onto the bidirectional screw (104).

4. A precision CNC machine tool welding positioning clamp according to claim 3, characterized in that: An auxiliary roller (205) is rotatably mounted on the bottom of the movable seat (201), and the auxiliary roller (205) is in contact with the surface of the track beam (101).

5. The precision CNC machine tool welding positioning clamp according to claim 1, characterized in that: A mounting seat (307) is fixed to one side of the eccentric block (306), the mounting seat (307) is placed on one side of the frame (301), a driving motor C (308) is fixed to the end of the mounting seat (307), and a transmission gear B (309) is installed on the output shaft of the transmission gear B (309).

6. A precision CNC machine tool welding positioning clamp according to claim 5, characterized in that: The clamping mechanism (4) comprises a rotating disk (401), the back of which is provided with an angle adjustment toothed disk (402), and the transmission gear B (309) and the angle adjustment toothed disk (402) are meshed with each other.

7. A precision CNC machine tool welding positioning clamp according to claim 6, characterized in that: A driving motor B (304) is fixed to one side of the frame (301), a threaded rod (305) is installed at the output end of the driving motor B (304), the threaded rod (305) is rotatably placed inside the frame (301), and the eccentric block (306) is screwed onto the threaded rod (305).

8. The welding positioning clamp for a precision CNC machine tool according to claim 6, characterized in that: The front surface of the turntable (401) is provided with a track groove (403), a clamping screw (404) is rotatably mounted inside the track groove (403), at least two clamping blocks (405) are symmetrically slidably mounted inside the track groove (403), the clamping blocks (405) are screwed onto the clamping screw (404), and the front surface of the turntable (401) is evenly engraved with scale lines (406) along both sides of the track groove (403).

9. The precision CNC machine tool welding positioning clamp according to claim 1, characterized in that: A distance meter (206) is provided on one side surface of the two side plates (202) close to each other, and the two distance meters (206) correspond to each other.

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