Grinding Method and Grinding Device for Precision Slender Shaft

Abstract

The present invention provides a grinding method and a grinding device for precision slender shafts, belonging to the technical field of machining. It includes: 1) clamping the workpiece; 2) installing a single-point support device; 3) judging whether the support block is in contact with the workpiece by conducting a circuit; 4) disassembling the conducting circuit; 5) setting the tool and starting to grind the workpiece; 6) judging whether the contact between the workpiece and the support block is good by the outer diameter of both ends of the workpiece and the outer diameter of the supported part; 7) gradually grinding the allowance of the workpiece to eliminate the axial runout error of the workpiece and ensure the precision requirements of the workpiece. The present invention supports the radial direction of the workpiece through a single-point support device, eliminates the radial cutting force received by the workpiece, avoids the bending of the precision slender shaft during grinding, improves the grinding precision from IT5 in the prior art to IT2, doubles the processing efficiency, and improves the processing precision of precision slender shaft parts.

Description

Technical Field

[0001] The present invention belongs to the technical field of machining, relates to part grinding technology, and specifically relates to a grinding method and a grinding device for a precision slender shaft. Background Art

[0002] Precision slender shaft parts are widely used in the precision machinery industry. For example, they are used for aviation precision parts, positioning parts, coaxiality measuring tools, etc. Due to the high precision requirements and poor rigidity of precision slender shaft parts, during grinding, vibration is extremely likely to occur, affecting the machining accuracy. In the prior art, for the grinding of precision slender shaft parts, an open center rest is used to support the workpiece for grinding. Before machining, a reference outer circle needs to be ground at the workpiece support area for the two-point support of the center rest on the workpiece. However, during the cutting process, the precision slender shaft part is mainly affected by the radial cutting force and grinding heat, and is extremely likely to bend and deform, affecting the surface quality and machining accuracy of the precision slender shaft, resulting in greater difficulty in the grinding process of the precision slender shaft. Summary of the Invention

[0003] Aiming at the problem in the above-mentioned prior art that during the grinding of precision slender shaft parts, they are mainly affected by the radial cutting force and grinding heat, and are extremely likely to bend and deform, affecting the surface quality and machining accuracy of the precision slender shaft, the present invention provides a grinding method and a grinding device for a precision slender shaft.

[0004] The present invention provides a grinding method and a single-point support device for a precision slender shaft part. By radially supporting the workpiece through the single-point support device, the radial cutting force on the workpiece is eliminated, bending of the precision slender shaft during grinding is avoided, and the machining efficiency and machining accuracy of the precision slender shaft part are improved. At the same time, the present invention mainly realizes the grinding process of precision slender shaft parts with a diameter < φ4, and the grinding accuracy grade can reach IT2. The specific technical solution is as follows:

[0005] The grinding method for a precision slender shaft includes the following steps:

[0006] 1) Clamping the workpiece: Both ends of the workpiece are tightened by the centers, the clamping force is adjusted to the minimum, and there is no axial movement of the workpiece. The axial direction of the workpiece and the axial direction of the centers are both parallel to the Z direction of the workbench.

[0007] 2) Installing the single-point support device: Install the base on the machine tool guide rail, align the support block with the outer circle of the middle part of the workpiece, and adjust the locking nut to keep the axial clearance of the adjustable screw at the minimum.

[0008] 3) Forming a conduction loop between the base and the workpiece through a conduction circuit, so that the support block contacts the workpiece and radially supports the workpiece.

[0009] 4) Removing the conduction circuit in step 3).

[0010] 5) Perform tool setting, start grinding the outer diameter of the workpiece, and the grinding allowance is 0.02 mm - 0.03 mm;

[0011] 6) After polishing the outer diameter of the workpiece, remove the workpiece and measure the outer diameter of both ends of the workpiece and the outer diameter of the support part. If the outer diameter of both ends is greater than or equal to the outer diameter of the support part, there is no need to adjust the position of the support block, and continue to grind the outer diameter of the workpiece; if the outer diameter of both ends is less than the outer diameter of the support part, the position of the support block needs to be adjusted, repeat step 1), grind the outer diameter of the workpiece until the outer diameter of both ends is equal to the outer diameter of the support part;

[0012] 7) Repeat step 1) and step 6), gradually grind the allowance of the workpiece, eliminate the axial runout error of the workpiece, and ensure the accuracy requirements of the workpiece.

[0013] Further defined, step 3) is specifically: connect the light-emitting diode to the terminal on the base through one end of the wire, connect the power supply to the alligator clip through the other end of the wire, and clamp the alligator clip on the workpiece; adjust the adjustable screw, drive the support block to move towards the outer surface of the workpiece by moving the support member, so that the support block contacts the outer surface of the workpiece, the base and the workpiece form a conduction loop, the light-emitting diode emits light, and radially support the workpiece through the support block.

[0014] Further defined, step 5) is specifically: perform tool setting, start longitudinally grinding the outer diameter of the workpiece, the longitudinal grinding feed speed is 250 mm / min - 350 mm / min, the linear speed of the grinding wheel is 20 m / s - 50 m / s, the workpiece rotation speed is 60 r / min - 130 r / min, the transverse feed of the grinding wheel is 0.002 mm - 0.005 mm, and when the grinding allowance of the workpiece is 0.02 mm - 0.03 mm, a complete grinding is completed.

[0015] Further defined, step 6) is specifically: after a complete grinding is completed, remove the workpiece, measure the outer diameter of both ends of the workpiece and the outer diameter of the support part, and judge the contact situation between the support block and the workpiece according to the difference between the outer diameter of both ends and the outer diameter of the support part;

[0016] If the outer diameter of both ends is greater than or equal to the outer diameter of the support part, and the difference between the outer diameter of both ends and the outer diameter of the support part is set as A at this time, then the contact between the support block and the workpiece is good, there is no need to adjust the position of the support block, repeat step 1), grind the outer diameter of the workpiece, and the transverse feed allowance at this time is A;

[0017] If the outer diameters of both ends are smaller than the outer diameter of the supported part, the contact between the support block and the workpiece is poor. It is necessary to adjust the position of the support block. Set the absolute value of the difference between the outer diameters of both ends and the outer diameter of the supported part at this time as B. Observe the dial indicator and adjust the position of the support block. The horizontal adjustment amount is B / 2, and the adjustment direction is towards the workpiece. Repeat step 1), grind the outer circle of the workpiece until the outer diameters of both ends are equal to the outer diameter of the supported part.

[0018] Further defined, step 7) is specifically: repeat step 1) and step 6), gradually grind the surplus of the workpiece, eliminate the axial runout error of the workpiece, ensure that the runout error of the workpiece is not greater than 0.002 mm, the straightness of the workpiece is not greater than 0.002 mm, and the dimensional tolerance of the workpiece is not greater than 0.002 mm, so as to ensure the accuracy requirements of the workpiece.

[0019] Further defined, when the support block contacts the workpiece, it is necessary to ensure that the head of the dial indicator is in full contact with the outer end face of the adjustable screw, so that the pre-pressing amount of the head of the dial indicator on the outer end face of the adjustable screw is 0.03 mm - 0.05 mm.

[0020] Based on the above-mentioned grinding method of the precision slender shaft, a cutting device for the precision slender shaft is formed, which includes a single-point support device, a grinding wheel and a center. The single-point support device and the grinding wheel are arranged oppositely along the radial direction of the workpiece. The centers are arranged at both ends of the workpiece, and the centers are coaxially arranged with the workpiece. The axial direction of the single-point support device is perpendicular to the axial direction of the centers. The grinding surface of the grinding wheel contacts the grinding surface of the workpiece.

[0021] Further defined, the single-point support device includes a base, a dial indicator, an adjustable screw, a conduction circuit, a moving support and a support block. One end of the moving support is connected to the adjustable screw, and the other end of the moving support penetrates through the base and is fixedly connected to the support block. The dial indicator is fixedly connected to the base. The head of the dial indicator contacts the outer end face of the adjustable screw. The axial directions of the moving support and the support block are both perpendicular to the axial direction of the centers. The conduction circuit is arranged between the base and the workpiece.

[0022] Further defined, the single-point support device further includes a bracket and a locking nut. The dial indicator is fixedly connected to the base through the bracket. The locking nut is arranged between the adjustable screw and the base.

[0023] Further defined, the conduction circuit includes an alligator clip, a power supply, a wire, a light-emitting diode and a terminal. The terminal is fixedly connected to the base. The alligator clip, the power supply and the light-emitting diode are sequentially connected in series through the wire from front to back. The alligator clip clamps the workpiece. The light-emitting diode is electrically connected to the terminal.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. The present invention supports the radial direction of the workpiece through a single-point support device, eliminates the action of the radial cutting force on the workpiece, avoids the bending of the precision slender shaft during grinding, improves the grinding accuracy from IT5 in the prior art to IT2, and improves the machining accuracy of the precision slender shaft parts. At the same time, the present invention does not require grinding a reference circle in advance, saves the machining process, and doubles to triples the machining efficiency of the precision slender shaft parts. At the same time, the present invention is mainly used for the grinding of precision slender shaft parts with a diameter < φ4, overcoming the problem that the prior art cannot grind precision slender shaft parts with a diameter < φ4.

[0026] 2. The grinding method and device for the precision slender shaft of the present invention can be widely applied to the grinding of high-precision slender shafts, and can also be applied to the grinding of precision slender shaft parts clamped by three-jaw chucks and snap rings, with a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional structure diagram of the grinding device for the precision slender shaft of the present application;

[0028] Figure 2 is the front view of the grinding device for the precision slender shaft of the present application;

[0029] Figure 3 is Figure 2 the partial enlarged view of part I in

[0030] Figure 4 is the top view of the grinding device for the precision slender shaft of the present application;

[0031] Among them, 1 - base, 2 - bracket, 3 - dial indicator, 4 - adjustable screw, 5 - locking nut, 6 - alligator clip, 7 - power supply, 8 - wire, 9 - light-emitting diode, 10 - terminal, 11 - moving support, 12 - support block, 13 - workpiece, 14 - grinding wheel, 15 - center. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The technical solutions of the present invention will be further explained below in conjunction with the drawings and embodiments, but the present invention is not limited to the following embodiments.

[0033] Embodiment 1

[0034] The grinding method for the precision slender shaft in this embodiment includes the following steps:

[0035] 1) Clamping the workpiece 13: Both ends of the workpiece 13 are tightened by the centers 15, that is, the workpiece 13 is axially tightened by the centers 15, the clamping force is adjusted to the minimum, and the workpiece 13 has no axial movement. The axis of the workpiece 13 and the axis of the centers 15 are both parallel to the Z direction of the workbench;

[0036] 2) Install the single-point support device: Install the base 1 on the machine tool guide rail so that the support block 12 aligns with the outer circle of the middle part of the workpiece 13; support the workpiece 13 radially through the support block 12 to eliminate the action of the radial cutting force on the workpiece; at the same time, adjust the lock nut 5 to keep the axial clearance of the adjustable screw 4 to the minimum;

[0037] 3) Form a conduction loop between the base 1 and the workpiece 13 through the conduction circuit, so that the support block 12 contacts the workpiece 13 to support the workpiece 13 radially;

[0038] Specifically, step 3) is: Connect the light-emitting diode 9 to the terminal 10 on the base 1 through one end of the wire 8, connect the power supply 7 to the alligator clip 6 through the other end of the wire 8, and clamp the alligator clip 6 on the workpiece 13; adjust the adjustable screw 4, and drive the support block 12 to move towards the outer circle surface of the workpiece 13 by moving the support member 11, so that the support block 12 contacts the outer circle surface of the workpiece 13. Finally, a conduction loop is formed between the base 1 and the workpiece 13, and the light-emitting diode 9 emits light, and the workpiece 13 is supported radially through the support block 12.

[0039] 4) Disassemble the conduction circuit in step 3); specifically, remove the alligator clip 6, the power supply 7, the light-emitting diode 9 and the wire 8;

[0040] 5) Perform tool setting and start grinding the outer circle of the workpiece 13, and the grinding amount is 0.02 mm - 0.03 mm;

[0041] Specifically, step 5) is: perform tool setting, start longitudinal grinding of the outer circle of workpiece 13, the feed rate of longitudinal grinding is 250 mm / min - 350 mm / min. Specifically, the feed rate of longitudinal grinding is selected according to the diameter and material of the workpiece. The linear speed of grinding wheel 14 is 20 m / s - 50 m / s. Specifically, during rough grinding, a higher linear speed is selected for grinding wheel 14, and during fine grinding, a lower linear speed is selected for grinding wheel 14. The rotational speed of the workpiece is 60 r / min - 130 r / min, the transverse feed of grinding wheel 14 is 0.002 mm - 0.005 mm. When the grinding amount of workpiece 13 is 0.02 mm - 0.03 mm, a complete grinding is completed. Further specifically, the grinding amount of the outer circle of workpiece 13 can be 0.02 mm, 0.025 mm or 0.03 mm; the feed rate of longitudinal grinding can be 250 mm / min, 260 mm / min, 270 mm / min, 280 mm / min, 290 mm / min, 300 mm / min, 310 mm / min, 320 mm / min, 330 mm / min, 340 mm / min or 350 mm / min, the linear speed of grinding wheel 14 can be 60 r / min, 70 r / min, 80 r / min, 90 r / min, 100 r / min, 110 r / min, 120 r / min or 130 r / min, and the transverse feed of grinding wheel 14 can be 0.002 mm, 0.003 mm, 0.004 mm or 0.005 mm;

[0042] 6) After polishing the outer circle of workpiece 13, remove workpiece 13 and measure the outer circle diameters at both ends of workpiece 13 and the outer circle diameter of the support part. If the outer circle diameters at both ends are greater than or equal to the outer circle diameter of the support part, there is no need to adjust the position of support block 12, and continue to grind the outer circle of workpiece 13; if the outer circle diameters at both ends are less than the outer circle diameter of the support part, the position of support block 12 needs to be adjusted, repeat step 1), grind the outer circle of workpiece 13 until the outer circle diameters at both ends are equal to the outer circle diameter of the support part;

[0043] Specifically, step 6) is: after completing a complete grinding, remove workpiece 13, measure the outer circle diameters at both ends of workpiece 13 and the outer circle diameter of the support part, and judge the contact situation between support block 12 and workpiece 13 according to the difference between the outer circle diameters at both ends and the outer circle diameter of the support part;

[0044] If the outer circle diameters at both ends are greater than or equal to the outer circle diameter of the support part, set the difference between the outer circle diameters at both ends and the outer circle diameter of the support part at this time as A, then the contact between support block 12 and workpiece 13 is good, there is no need to adjust the position of support block 12, repeat step 1), grind the outer circle of workpiece 13, and the transverse feed allowance at this time is A;

[0045] If the outer diameters of both ends are smaller than the outer diameter of the support part, the contact between the support block 12 and the workpiece 13 is poor. It is necessary to adjust the position of the support block 12. Set the absolute value of the difference between the outer diameters of both ends and the outer diameter of the support part at this time as B. Observe the dial indicator 3 to adjust the position of the support block 12. The lateral adjustment amount is B / 2, and the adjustment direction is towards the workpiece 13. Repeat step 1), grind the outer circle of the workpiece 13 until the outer diameters of both ends are equal to the outer diameter of the support part;

[0046] 7) Repeat step 1) and step 6) to gradually grind the allowance of the workpiece 13, eliminate the axial runout error of the workpiece 13, and ensure the accuracy of the workpiece 13;

[0047] Specifically, step 7) is: repeat step 1) and step 6) to gradually grind the allowance of the workpiece 13, eliminate the axial runout error of the workpiece 13, ensure that the runout error of the workpiece 13 is not greater than 0.002 mm, the straightness of the workpiece 13 is not greater than 0.002 mm, and the dimensional tolerance of the workpiece 13 is not greater than 0.002 mm, so as to ensure the accuracy requirements of the workpiece 13.

[0048] In step 3), when the support block 12 contacts the workpiece 13, it is necessary to ensure that the head of the dial indicator 3 is in full contact with the outer end face of the adjustable screw 4, so that the pre-pressing amount of the head of the dial indicator 3 on the outer end face of the adjustable screw 4 is 0.03 mm - 0.05 mm. Specifically, the pre-pressing amount of the head of the dial indicator 3 on the outer end face of the adjustable screw 4 can be 0.03 mm, 0.04 mm or 0.05 mm.

[0049] Embodiment 2

[0050] The cutting device for the precision slender shaft in this embodiment is formed based on the grinding method of the precision slender shaft in Embodiment 1, and includes a single-point support device, a grinding wheel 14 and a center 15. The single-point support device and the grinding wheel 14 are arranged opposite to each other along the radial direction of the workpiece 13. The center 15 is arranged at both ends of the workpiece 13, and the center 15 is coaxially arranged with the workpiece 13. The axial direction of the single-point support device is perpendicular to the axial direction of the center 15, and the grinding surface of the grinding wheel 14 contacts the grinding surface of the workpiece 13.

[0051] The single-point support device includes a base 1, a dial indicator 3, an adjustable screw 4, a conduction circuit, a moving support member 11 and a support block 12. One end of the moving support member 11 is connected to the adjustable screw 4, and the other end of the moving support member 11 penetrates through the base 1 and is fixedly connected to the support block 12. The dial indicator 3 is fixedly connected to the base 1, and the head of the dial indicator 3 contacts the outer end face of the adjustable screw 4. The conduction circuit is arranged between the base 1 and the workpiece 13. The axial direction of the moving support member 11 and the axial direction of the support block 12 are both perpendicular to the axial direction of the center 15.

[0052] The single-point support device further includes a bracket 2 and a lock nut 5. The dial indicator 3 is fixedly connected to the base 1 through the bracket 2. The lock nut 5 is arranged between the adjustable screw 4 and the base 1. Specifically, one end face of the lock nut 5 contacts one end face of the base 1.

[0053] The conduction circuit of this embodiment includes an alligator clip 6, a power supply 7, a wire 8, a light-emitting diode 9, and a terminal 10. The terminal 10 is fixedly connected to the base 1. The alligator clip 6, the power supply 7, and the light-emitting diode 9 are sequentially connected in series through the wire 8 from front to back. The alligator clip 6 clamps the workpiece 13, and the light-emitting diode 9 is electrically connected to the terminal 10, so that a conduction loop can be formed between the base 1 and the workpiece 13.

[0054] In this application, the Z direction of the workbench refers to the moving direction of the machine tool workbench.

[0055] The workpiece 13 in this application refers to a precision slender shaft.

Claims

1. A grinding method for a precision slender shaft, characterized in that, It includes the following steps: 1) Clamp the workpiece (13): Tighten both ends of the workpiece (13) with the centers (15) to ensure that the axial direction of the workpiece (13) and the axial direction of the centers (15) are both parallel to the Z-axis of the workbench; 2) Install the single-point support device: Install the base (1) on the machine tool guide rail so that the support block (12) aligns with the outer circle of the middle part of the workpiece (13); 3) Form a conduction loop between the base (1) and the workpiece (13) through the conduction circuit, so that the support block (12) contacts the workpiece (13) to radially support the workpiece (13); The specific operation of step 3) is: Connect the light-emitting diode (9) and the terminal (10) on the base (1) through one end of the wire (8), connect the power supply (7) and the alligator clip (6) through the other end of the wire (8), and clamp the alligator clip (6) on the workpiece (13); The adjustable screw (4) is arranged at one end of the movable support (11). Adjust the adjustable screw (4), drive the support block (12) to move towards the outer circle surface of the workpiece (13) through the movable support (11), so that the support block (12) contacts the outer circle surface of the workpiece (13). A conduction loop is formed between the base (1) and the workpiece (13), and the light-emitting diode (9) emits light. Radially support the workpiece (13) through the support block (12); 4) Disassemble the conduction circuit in step 3); 5) Perform tool setting and start grinding the outer circle of the workpiece (13), and the grinding amount is 0.02 mm - 0.03 mm; The specific operation of step 5) is: Perform tool setting and start longitudinally grinding the outer circle of the workpiece (13). The feed rate of longitudinal grinding is 250 mm / min - 350 mm / min, the linear speed of the grinding wheel (14) is 20 m / s - 50 m / s, the rotational speed of the workpiece (13) is 60 r / min - 130 r / min, the transverse feed amount of the grinding wheel (14) is 0.002 mm - 0.005 mm. When the grinding amount of the workpiece (13) is 0.02 mm - 0.03 mm, a complete grinding is completed; 6) After polishing the outer circle of the workpiece (13), remove the workpiece (13) and measure the outer circle diameters at both ends of the workpiece (13) and the outer circle diameter at the support part. If the outer circle diameters at both ends are greater than or equal to the outer circle diameter at the support part, there is no need to adjust the position of the support block (12), and continue to grind the outer circle of the workpiece (13); If the outer circle diameters at both ends are smaller than the outer circle diameter at the support part, the position of the support block (12) needs to be adjusted. Repeat step 1) to grind the outer circle of the workpiece (13) until the outer circle diameters at both ends are equal to the outer circle diameter at the support part; The specific operation of step 6) is: After a complete grinding is completed, remove the workpiece (13), measure the outer circle diameters at both ends of the workpiece (13) and the outer circle diameter at the support part, and judge the contact situation between the support block (12) and the workpiece (13) according to the difference between the outer circle diameters at both ends and the outer circle diameter at the support part; If the outer diameter of both ends is greater than or equal to the outer diameter of the support part, set the difference between the outer diameter of both ends and the outer diameter of the support part at this time as A. Then, the contact between the support block (12) and the workpiece (13) is good, and there is no need to adjust the position of the support block (12). Repeat step 1), and grind the outer circle of the workpiece (13). At this time, the cross-feed allowance is A. If the outer diameter of both ends is less than the outer diameter of the support part, the contact between the support block (12) and the workpiece (13) is poor, and the position of the support block (12) needs to be adjusted. Set the absolute value of the difference between the outer diameter of both ends and the outer diameter of the support part at this time as B. Observe the dial indicator (3) to adjust the position of the support block (12). The lateral adjustment amount is B / 2, and the adjustment direction is towards the workpiece (13). Repeat step 1), and grind the outer circle of the workpiece (13) until the outer diameter of both ends is equal to the outer diameter of the support part. 7) Repeat step 1), step 5) and step 6) to gradually grind the allowance of the workpiece (13), eliminate the axial runout error of the workpiece (13), and ensure the accuracy requirements of the workpiece (13).

2. The grinding method for a precision slender shaft according to claim 1, characterized in that, The specific content of step 7) is: repeat step 1) and step 6) to gradually grind the allowance of the workpiece (13), eliminate the axial runout error of the workpiece (13), ensure that the runout error of the workpiece (13) is not greater than 0.002 mm, the straightness of the workpiece (13) is not greater than 0.002 mm, and the dimensional tolerance of the workpiece (13) is not greater than 0.002 mm, so as to ensure the accuracy requirements of the workpiece (13).

3. The grinding method for a precision slender shaft according to claim 2, characterized in that, When the support block (12) contacts the workpiece (13), it is necessary to ensure that the head of the dial indicator (3) is in full contact with the outer end face of the adjustable screw (4), so that the pre-pressing amount of the head of the dial indicator (3) on the outer end face of the adjustable screw (4) is 0.03 mm - 0.05 mm.

4. A cutting device for a precision slender shaft formed based on the grinding method for a precision slender shaft according to claim 2, characterized in that, It includes a single-point support device, a grinding wheel (14) and a center (15). The single-point support device and the grinding wheel (14) are arranged opposite to each other along the radial direction of the workpiece (13). The center (15) is arranged at both ends of the workpiece (13), and the center (15) is coaxially arranged with the workpiece (13). The axial direction of the single-point support device is perpendicular to the axial direction of the center (15). The grinding surface of the grinding wheel (14) contacts the grinding surface of the workpiece (13). The single-point support device includes a base (1), a dial indicator (3), an adjustable screw (4), a conduction circuit, a movable support (11) and a support block (12). One end of the movable support (11) is connected to the adjustable screw (4). The other end of the movable support (11) passes through the base (1) and is fixedly connected to the support block (12). The dial indicator (3) is fixedly connected to the base (1). The head of the dial indicator (3) contacts the outer end face of the adjustable screw (4). The axial directions of the movable support (11) and the support block (12) are both perpendicular to the axial direction of the center (15). The conduction circuit is arranged between the base (1) and the workpiece (13). The single-point support device further includes a bracket (2) and a locking nut (5). The dial indicator (3) is fixedly connected to the base (1) through the bracket (2). The locking nut (5) is arranged between the adjustable screw (4) and the base (1). The conduction circuit includes an alligator clip (6), a power supply (7), a wire (8), a light-emitting diode (9), and a terminal (10). The terminal (10) is fixedly connected to the base (1). The alligator clip (6), the power supply (7), and the light-emitting diode (9) are sequentially connected in series through the wire (8) from front to back. The alligator clip (6) is clamped on the workpiece (13), and the light-emitting diode (9) is electrically connected to the terminal (10).

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