Two-point edge finder and use method thereof

Abstract

The invention relates to the technical field of machining, in particular to a two-point edge finder and a using method thereof. Comprising a fixing rod, a rotating pin shaft is arranged on the fixing rod, a base is arranged at the bottom of the fixing rod, a first mounting hole is formed in the base, a metal contact is arranged at the bottom of the base, a first mounting seat and a second mounting seat are arranged on the two sides of the rotating pin shaft, and a second mounting hole is vertically formed in the upper surface of the first mounting seat; an elastic mechanism is arranged in the second mounting hole, a safety pin is fixed to the top of the elastic mechanism, a threaded hole is horizontally formed in the end of the second mounting base, an adjusting screw is arranged in the threaded hole, a safety cover is arranged above the first mounting base, a positioning groove is formed in the lower surface of the safety cover, and the adjusting screw abuts against the side wall of the safety cover. The metal contact can drive the base to rotate around the rotating pin shaft, then the elastic mechanism is compressed, the metal contact is prevented from being broken, and after the metal contact leaves the workpiece, the elastic mechanism is reset, so that the metal contact returns to a normal state.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to a two-point edge finder and a use method thereof. Background Art

[0002] Edge finders are detection tools used in CNC machining to accurately determine the center position of the workpiece to be processed. Edge finders mainly include mechanical eccentric edge finders, photoelectric edge finders, and 3D edge finders. However, during the measurement process, mechanical eccentric edge finders and photoelectric edge finders cannot guarantee that the same part of the edge finder contacts the workpiece to be processed every time, and cannot eliminate the clamping error and manufacturing error, resulting in low detection accuracy. 3D edge finders eliminate the above defects, but they need to be debugged before use and have high production costs.

[0003] Chinese invention patent CN104924155B discloses a two-point 3D edge finder, including a shaft and a fixing part fixed under the shaft, and a No. 1 metal contact and a No. 2 metal contact whose lower ends extend out of the fixing part are arranged at the bottom of the fixing part; the axis of the No. 1 metal contact, the axis of the No. 2 metal contact and the axis of the shaft part are located in the same vertical plane. When the No. 1 metal contact and the No. 2 metal contact contact the workpiece at the same time, the machine tool records the data, and after detecting several sets of data on different workpiece detection surfaces, the data is calculated and analyzed, thereby completing the detection of the workpiece size. The two-point 3D edge finder can ensure that the same part of the edge finder contacts the workpiece to be processed each time, effectively eliminating the influence of clamping errors and manufacturing errors, and no debugging is required before use, and the production cost is low. However, for the two-point 3D edge finder, the machine tool spindle will drive the metal contact of the two-point edge finder to move toward the workpiece to be measured. If the stroke of the machine tool spindle is greater than the distance between the metal contact and the workpiece, the metal contact will continue to move toward the workpiece after contacting the workpiece. If the stroke is too large, the metal contact may easily break. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a two-point edge finder and a use method thereof to prevent metal contacts from breaking.

[0005] The technical solution adopted by the present invention to solve its technical problem is a two-point edge finder, including a fixing rod, a first through hole is provided on the fixing rod, a rotating pin is provided in the first through hole, a base is provided at the bottom of the fixing rod, a first mounting hole is provided on the base for placing the two ends of the rotating pin, a No. 1 metal contact and a No. 2 metal contact are provided at intervals at the bottom of the base along the axial direction of the rotating pin, a first mounting seat and a second mounting seat fixed to the base are provided on both sides of the rotating pin, a second mounting hole is vertically provided on the upper surface of the first mounting seat, an elastic mechanism is provided in the second mounting hole, a safety pin is fixed on the top of the elastic mechanism, a threaded hole is horizontally provided on the end of the second mounting seat, an adjusting screw is provided in the threaded hole, a safety cover sleeved on the fixing rod is provided above the first mounting seat, a positioning groove used in conjunction with the safety pin is provided on the lower surface of the safety cover, and the adjusting screw abuts against the side wall of the safety cover away from the positioning groove.

[0006] Furthermore, a power box is provided on the base, a built-in power supply is provided in the power box, an indicator light is provided between the No. 1 metal contact and the No. 2 metal contact, one pole of the built-in power supply is electrically connected to the No. 2 metal contact, the other pole of the built-in power supply is electrically connected to one pole of the indicator light, and the other pole of the indicator light is electrically connected to the No. 1 metal contact.

[0007] Furthermore, the power supply box is provided in two pieces, each of which is located at the top of the first mounting hole, and a battery cover is provided on the power supply box.

[0008] Furthermore, a limiting plate fixed on the safety cover is arranged above the second mounting seat.

[0009] Furthermore, a limiting boss is arranged in the second mounting hole, a limiting ring used in conjunction with the limiting boss is arranged in the second mounting hole, and the limiting ring is fixedly connected to the safety pin.

[0010] Furthermore, the top surface of the safety pin is a hemispherical surface, and the side wall of the positioning groove close to the fixing rod is an inclined surface.

[0011] Furthermore, the lower surface of the base is provided with threaded mounting holes for mounting the No. 1 metal contact and the No. 2 metal contact.

[0012] Furthermore, the axis of the rotating pin, the axis of the No. 1 metal contact and the axis of the No. 2 metal contact are located on the same plane.

[0013] The method for using a two-point edge finder adopts a two-point edge finder, wherein a power supply box is arranged on the base, a built-in power supply is arranged in the power supply box, an indicator light is arranged between the first metal contact and the second metal contact, one pole of the built-in power supply is electrically connected to the second metal contact, the other pole of the built-in power supply is electrically connected to one pole of the indicator light, and the other pole of the indicator light is electrically connected to the first metal contact; the method comprises the following steps:

[0014] S1: Install the fixing rod to the spindle of the CNC machine tool so that the axis of the fixing rod coincides with the axis of the spindle of the CNC machine tool, and rotate the adjusting screw to adjust the parallelism between the No. 1 metal contact and the No. 2 metal contact and the axis of the fixing rod;

[0015] S2: The workpiece to be processed is fixed on the table of the CNC machine tool. The workpiece has at least two detection surfaces. The CNC machine tool drives the two-point edge finder to move so that the No. 1 metal contact contacts the first detection surface of the workpiece first. After the No. 1 metal contact contacts the first detection surface, the two-point edge finder rotates around the main axis of the machine tool and drives the No. 2 metal contact to slowly approach the first detection surface of the workpiece with a step distance of 0.1mm until the No. 2 metal contact contacts the first detection surface of the workpiece. The workpiece is a metal part. The internal circuit of the edge finder is turned on, and the indicator light just lights up. Then, the No. 2 metal contact is retreated with a step distance of 0.01mm until the indicator light goes out. Finally, it is slowly approached with a step distance of 0.001mm until the indicator light just lights up. The movement stops, and the CNC machine tool records the coordinates of the first detection surface.

[0016] S3: Repeat step S2 to record the coordinates of all the detection surfaces, and then calculate the center coordinates of the workpiece.

[0017] Further, the workpiece includes a cuboid workpiece, an inner square hole workpiece, a cylindrical workpiece or an inner circular hole workpiece;

[0018] When the workpiece is a rectangular workpiece, the four sides A, B, C, and D of the rectangular workpiece are detection surfaces. The coordinates of the side A are measured as X1, the coordinates of the side B are measured as X2, the coordinates of the side C are measured as Y1, and the coordinates of the side D are measured as Y2. The geometric center (X, Y) of the top surface of the rectangular workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2.

[0019] When the workpiece is an inner square hole workpiece, the four inner side surfaces A, B, C, and D of the inner square hole workpiece are detection surfaces. The coordinates of the side surface A are measured as X1, the coordinates of the side surface B are measured as X2, the coordinates of the side surface C are measured as Y1, and the coordinates of the side surface D are measured as Y2. The geometric center (X, Y) of the inner hole of the inner square hole workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2.

[0020] When the workpiece is a cylindrical workpiece, the outer circumference of the cylindrical workpiece is divided into four symmetrical detection surfaces, and the coordinates of two symmetrical detection surfaces are detected respectively, marked as X1 and X2. The Y coordinate should be kept unchanged during the detection of X1 and X2. Then the coordinates of the other two symmetrical detection surfaces are detected respectively, marked as Y1 and Y2. The X coordinate should be kept unchanged during the detection of Y1 and Y2. The geometric center (X, Y) of the top surface of the cylindrical workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2.

[0021] When the workpiece is an inner hole workpiece, the inner circumference of the inner hole workpiece is divided into four symmetrical detection surfaces, and the coordinates of two symmetrical detection surfaces are detected respectively, marked as X1 and X2. The Y coordinate should be kept unchanged during the detection of X1 and X2. Then the coordinates of the other two symmetrical detection surfaces are detected respectively, marked as Y1 and Y2. The X coordinate should be kept unchanged during the detection of Y1 and Y2. The geometric center (X, Y) of the inner hole of the inner hole workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2.

[0022] The beneficial effect of the present invention is that by setting a rotating pin, the base can rotate around the rotating pin, and the first mounting seat and the second mounting seat can also rotate around the rotating pin. When in use, the second mounting seat is opposite to the workpiece, and the stroke of the machine tool spindle is greater than the distance between the metal contact and the workpiece, so that after the metal contact contacts the workpiece, the metal contact will continue to move toward the workpiece. Due to the limitation of the workpiece, the metal contact will drive the base to rotate around the rotating pin, thereby compressing the elastic mechanism to prevent the metal contact from being broken. After the metal contact leaves the workpiece, the elastic mechanism is reset to make the metal contact return to a normal state. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of the present invention;

[0024] Figure 2 yes Figure 1 Section view along AA;

[0025] Figure 3 yes Figure 2 The enlarged view of point B in the middle;

[0026] Figure 4 It is a schematic diagram for finding the geometric center of the top surface of a rectangular workpiece;

[0027] Figure 5 A schematic diagram for finding the geometric center of the inner hole of a square hole workpiece;

[0028] Figure 6 It is a schematic diagram for finding the geometric center of the top surface of a cylindrical workpiece;

[0029] Figure 7 It is a schematic diagram for finding the geometric center of the inner hole of a workpiece with an inner circular hole.

[0030] Figure markings: 1-fixing rod; 2-rotating pin; 3-base; 4-first mounting hole; 5-metal contact No. 1; 6-metal contact No. 2; 7-first mounting seat; 8-second mounting seat; 9-second mounting hole; 10-elastic mechanism; 11-safety pin; 12-adjusting screw; 13-safety cover; 14-positioning slot; 15-power box; 16-built-in power supply; 17-indicator light; 18-battery cover; 19-limiting plate; 20-limiting ring; 21-limiting boss; 22-inclined surface; 23-threaded mounting hole. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] like Figure 1-Figure 3 As shown, the two-point edge finder of the present invention comprises a fixed rod 1, a first through hole is provided on the fixed rod 1, a rotating pin 2 is provided in the first through hole, a base 3 is provided at the bottom of the fixed rod 1, a first mounting hole 4 for placing the two ends of the rotating pin 2 is provided on the base 3, a first metal contact 5 and a second metal contact 6 are provided at intervals at the bottom of the base 3 along the axial direction of the rotating pin 2, a first mounting seat 7 and a second mounting seat 8 fixed on the base 3 are provided on both sides of the rotating pin 2, and the first mounting seat A second mounting hole 9 is vertically provided on the upper surface of 7, an elastic mechanism 10 is provided in the second mounting hole 9, a safety pin 11 is fixed to the top of the elastic mechanism 10, a threaded hole is horizontally provided at the end of the second mounting seat 8, an adjusting screw 12 is provided in the threaded hole, a safety cover 13 sleeved on the fixing rod 1 is provided above the first mounting seat 7, a positioning groove 14 used in conjunction with the safety pin 11 is provided on the lower surface of the safety cover 13, and the adjusting screw 12 abuts against the side wall of the safety cover 13 away from the positioning groove 14.

[0033] Among them, the fixing rod 1 is a metal rod. When in use, the fixing rod 1 is installed on the main shaft of the machine tool, and the axis of the first through hole is perpendicular to and intersects with the axis of the fixing rod 1; a mounting groove can be provided on the upper surface of the base 3, and the end of the fixing rod 1 is located in the mounting groove, and a first mounting hole 4 is provided on two opposite groove walls of the mounting groove, and the two ends of the rotating pin shaft are placed in the first mounting hole 4, so that the base 3 can rotate around the fixing rod 1 with the axis of the rotating pin shaft 2 as the rotation axis; the rotating pin shaft 2 can be connected to the first through hole bearing, and then interference fit with the first mounting hole 4. The first metal contact 5 and the second metal contact 6 are used to contact with the workpiece. The first metal contact 5 and the second metal contact 6 are both fixedly connected to the lower surface of the base 3, and the axes of the first metal contact 5 and the second metal contact 6 are parallel to the axis of the fixing rod 1; the first mounting seat 7 and the second mounting seat 8 can be integrally formed with the base 3. If the first mounting seat 7, the second mounting seat 8 and the base 3 are all made of steel, they can also be connected by welding; the second mounting hole 9 is a countersunk hole, and the elastic mechanism 10 can adopt a spring. The bottom end of the elastic mechanism 10 is fixedly connected to the bottom wall of the second mounting hole 9, and the top end is fixedly connected to the safety pin 11; a threaded hole is horizontally arranged at the end of the second mounting seat 8, and an adjusting screw 12 is threadedly connected to the threaded hole, and the extending length of the adjusting screw 12 can be changed by rotating the adjusting screw 12. The safety cover 13 can be integrally formed with the fixing rod 1. It should be noted here that there must be a moving distance between the safety cover 13 and the first mounting seat 7 to ensure that the base 3 can rotate around the rotating pin 2; the lower surface of the safety cover 13 is provided with a positioning groove 14 used in conjunction with the safety pin 11, and the top of the safety pin 11 is located in the positioning groove 14 and abuts against the top wall of the positioning groove 14; the adjusting screw 12 abuts against the side wall of the safety cover 13 away from the positioning groove 14, and the adjusting screw 12 abuts against the side wall of the positioning groove 14. At the same time, the safety pin 11 abuts against the safety cover 13 under the action of the elastic mechanism 10, which can keep the base 3 in a stable state, and the position of the No. 1 metal contact 5 and the No. 2 metal contact 6 can be fine-tuned by rotating the adjusting screw 12 to ensure the measurement accuracy. When in use, the second mounting seat 8 is opposite to the workpiece, and the stroke of the machine tool spindle is greater than the distance between the metal contact and the workpiece, so that after the metal contact contacts the workpiece, the metal contact will continue to move toward the workpiece. Due to the limitation of the workpiece, the metal contact will drive the base 3 to rotate around the rotating pin 2, thereby compressing the elastic mechanism 10 to prevent the metal contact from being broken. After the metal contact leaves the workpiece, the elastic mechanism 10 is reset to return the metal contact to a normal state.

[0034] In order to accurately determine whether the first metal contact 5 and the second metal contact 6 are in contact with the workpiece, further refer to Figure 1, a power box 15 is provided on the base 3, a built-in power supply 16 is provided in the power box 15, an indicator light 17 is provided between the No. 1 metal contact 5 and the No. 2 metal contact 6, one pole of the built-in power supply 16 is electrically connected to the No. 2 metal contact 6, the other pole of the built-in power supply 16 is electrically connected to one pole of the indicator light 17, and the other pole of the indicator light 17 is electrically connected to the No. 1 metal contact 5. When the No. 1 metal contact 5 and the No. 2 metal contact 6 are both in contact with the workpiece, the No. 1 metal contact 5, the No. 2 metal contact 6, the built-in power supply 16 and the workpiece form a circuit, so that the indicator light 17 lights up, reminding the staff that the edge finder has moved into place.

[0035] In order to improve the applicability of the device, further see Figure 1 The power supply box 15 is provided with two, each located at the top of the first mounting hole 4, and a battery cover 18 is provided on the power supply box 15. Each power supply box 15 is provided with a built-in power supply 16, and the two built-in power supplies 16 are connected in parallel to form a battery pack. When the built-in power supply 16 runs out of power, the battery cover 18 can be opened and replaced.

[0036] Furthermore, a limiting plate 19 fixed on the safety cover 13 is provided above the second mounting seat 8 .

[0037] In order to prevent the safety pin 11 from being separated from the second mounting hole 9, further, see Figure 2 and Figure 3 A limiting boss 21 is provided in the second mounting hole 9, a limiting ring 20 used in conjunction with the limiting boss 21 is provided in the second mounting hole 9, and the limiting ring 20 is fixedly connected to the safety pin 11. The diameter of the limiting ring 20 is smaller than the diameter of the second mounting hole 9 and larger than the inner diameter of the limiting boss 21. Such a setting enables the limiting ring 20 to always be located in the second mounting hole 9, thereby preventing the safety pin 11 from being separated from the second mounting hole 9.

[0038] In order to facilitate the elastic mechanism 10 to better compress and rebound, further, see Figure 3 The top surface of the safety pin 11 is a hemispherical surface, and the side wall of the positioning groove 14 close to the fixing rod 1 is an inclined surface 22. When the base 3 rotates around the rotating pin 2, the safety pin 11 contacts the inclined surface 22, and the inclined surface 22 provides an inclined downward force. Most of this inclined downward force is used as the power for compressing the elastic mechanism 10, which can better compress the elastic mechanism 10. When the base 3 is reset, due to the inclination of the inclined surface 22, the safety pin 11 can more conveniently move along the inclined surface 22 until it abuts against the top wall of the positioning groove 14.

[0039] In order to facilitate the disassembly and assembly of the No. 1 metal contact 5 and the No. 2 metal contact 6, further see Figure 1The lower surface of the base 3 is provided with a threaded mounting hole 23 for mounting the No. 1 metal contact 5 and the No. 2 metal contact 6 , and the No. 1 metal contact 5 and the No. 2 metal contact 6 are both threadedly connected to the threaded mounting hole 23 .

[0040] Furthermore, the axis of the rotating pin 2, the axis of the first metal contact 5 and the axis of the second metal contact 6 are located on the same plane.

[0041] The method for using a two-point edge finder adopts a two-point edge finder, wherein a power box 15 is provided on the base 3, a built-in power supply 16 is provided in the power box 15, an indicator light 17 is provided between the first metal contact 5 and the second metal contact 6, one pole of the built-in power supply 16 is electrically connected to the second metal contact 6, the other pole of the built-in power supply 16 is electrically connected to one pole of the indicator light 17, and the other pole of the indicator light 17 is electrically connected to the first metal contact 5; it is characterized in that: it comprises the following steps,

[0042] S1: Install the fixing rod 1 to the spindle of the CNC machine tool so that the axis of the fixing rod 1 coincides with the axis of the spindle of the CNC machine tool, and rotate the adjusting screw 12 to adjust the parallelism between the axis of the No. 1 metal contact 5 and the No. 2 metal contact 6 and the axis of the fixing rod 1;

[0043] S2: The workpiece to be processed is fixed on the table of the CNC machine tool. The workpiece has at least two detection surfaces. The CNC machine tool drives the two-point edge finder to move so that the No. 1 metal contact 5 contacts the first detection surface of the workpiece first. After the No. 1 metal contact 5 contacts the first detection surface, the two-point edge finder rotates around the main axis of the machine tool and drives the No. 2 metal contact 6 to slowly approach the first detection surface of the workpiece with a step distance of 0.1mm until the No. 2 metal contact 6 contacts the first detection surface of the workpiece. The workpiece is a metal part. The internal circuit of the edge finder is turned on, and the indicator light 17 prompts that it has just lit up. Then, the No. 2 metal contact 6 is retreated with a step distance of 0.01mm until the indicator light 17 goes out, and finally, it is slowly approached with a step distance of 0.001mm until the indicator light 17 just lights up. If it is not certain that the indicator light 17 has just lit up, it can be retreated until the indicator light 17 goes out, and then moved forward until the indicator light 17 just lights up, and the movement stops. The CNC machine tool records the coordinates of the first detection surface;

[0044] S3: Repeat step S2 to record the coordinates of all the detection surfaces, and then calculate the center coordinates of the workpiece.

[0045] Further, the workpiece includes a rectangular workpiece, an inner square hole workpiece, a cylindrical workpiece or an inner circular hole workpiece;

[0046] See also Figure 4When the workpiece is a rectangular workpiece, the four sides A, B, C, and D of the rectangular workpiece are detection surfaces. The coordinates of the side A are measured as X1, the coordinates of the side B are measured as X2, the coordinates of the side C are measured as Y1, and the coordinates of the side D are measured as Y2. The geometric center (X, Y) of the top surface of the rectangular workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2.

[0047] See also Figure 5 When the workpiece is an inner square hole workpiece, the four inner side surfaces A, B, C, and D of the inner square hole workpiece are detection surfaces. The coordinates of the side surface A are measured as X1, the coordinates of the side surface B are measured as X2, the coordinates of the side surface C are measured as Y1, and the coordinates of the side surface D are measured as Y2. The geometric center (X, Y) of the inner hole center of the inner square hole workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2.

[0048] See also Figure 6 When the workpiece is a cylindrical workpiece, the outer surface of the cylindrical workpiece is divided into four symmetrical detection surfaces, and the coordinates of two symmetrical detection surfaces are marked as X1 and X2 respectively. The Y coordinate should be kept unchanged during the detection of X1 and X2. Then the coordinates of the other two symmetrical detection surfaces are marked as Y1 and Y2 respectively. The X coordinate should be kept unchanged during the detection of Y1 and Y2. The geometric center (X, Y) of the top surface of the cylindrical workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2;

[0049] See also Figure 7 When the workpiece is an inner hole workpiece, the inner circumference of the inner hole workpiece is divided into 4 symmetrical detection surfaces, and the coordinates of two symmetrical detection surfaces are detected respectively, marked as X1 and X2. The Y coordinate should be kept unchanged during the detection of X1 and X2. Then the coordinates of the other two symmetrical detection surfaces are detected respectively, marked as Y1 and Y2. The X coordinate should be kept unchanged during the detection of Y1 and Y2. The geometric center (X, Y) of the inner hole center of the inner hole workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2.

[0050] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A two-point edge finder, comprising a fixing rod (1), characterized in that: The fixing rod (1) is provided with a first through hole, a rotating pin shaft (2) is provided in the first through hole, a base (3) is provided at the bottom of the fixing rod (1), a first mounting hole (4) is provided on the base (3) for placing two ends of the rotating pin shaft (2), a first metal contact (5) and a second metal contact (6) are provided at intervals at the bottom of the base (3) along the axial direction of the rotating pin shaft (2), a first mounting seat (7) and a second mounting seat (8) fixed on the base (3) are provided on both sides of the rotating pin shaft (2), and a vertical mounting seat (7) is provided on the upper surface of the first mounting seat (7) A second mounting hole (9), wherein an elastic mechanism (10) is arranged in the second mounting hole (9), a safety pin (11) is fixed on the top of the elastic mechanism (10), a threaded hole is horizontally arranged at the end of the second mounting seat (8), an adjusting screw (12) is arranged in the threaded hole, a safety cover (13) sleeved on the fixing rod (1) is arranged above the first mounting seat (7), a positioning groove (14) used in conjunction with the safety pin (11) is arranged on the lower surface of the safety cover (13), and the adjusting screw (12) abuts against a side wall of the safety cover (13) away from the positioning groove (14).

2. The two-point edge finder according to claim 1, characterized in that: A power box (15) is provided on the base (3), a built-in power supply (16) is provided in the power box (15), an indicator light (17) is provided between the No. 1 metal contact (5) and the No. 2 metal contact (6), one pole of the built-in power supply (16) is electrically connected to the No. 2 metal contact (6), the other pole of the built-in power supply (16) is electrically connected to one pole of the indicator light (17), and the other pole of the indicator light (17) is electrically connected to the No. 1 metal contact (5).

3. The two-point edge finder as claimed in claim 2, characterized in that: The power supply boxes (15) are provided in two pieces, each of which is located at the top of the first mounting hole (4), and a battery cover (18) is provided on the power supply box (15).

4. The two-point edge finder according to claim 1, characterized in that: A limiting plate (19) fixed on the safety cover (13) is arranged above the second mounting seat (8).

5. The two-point edge finder according to claim 1, characterized in that: A limiting boss (21) is arranged in the second mounting hole (9), a limiting ring (20) used in conjunction with the limiting boss (21) is arranged in the second mounting hole (9), and the limiting ring (20) is fixedly connected to the safety pin (11).

6. The two-point edge finder according to claim 5, characterized in that: The top surface of the safety pin (11) is a hemispherical surface, and the side wall of the positioning groove (14) close to the fixing rod (1) is an inclined surface (22).

7. The two-point edge finder according to claim 1, characterized in that: The lower surface of the base (3) is provided with a threaded mounting hole (23) for mounting a No. 1 metal contact (5) and a No. 2 metal contact (6).

8. The two-point edge finder according to claim 1, characterized in that: The axis of the rotating pin (2), the axis of the first metal contact (5) and the axis of the second metal contact (6) are located on the same plane.

9. A method for using a two-point edge finder, using the two-point edge finder as described in any one of claims 1 to 8, wherein a power box (15) is provided on the base (3), a built-in power supply (16) is provided in the power box (15), an indicator light (17) is provided between the first metal contact (5) and the second metal contact (6), one pole of the built-in power supply (16) is electrically connected to the second metal contact (6), the other pole of the built-in power supply (16) is electrically connected to one pole of the indicator light (17), and the other pole of the indicator light (17) is electrically connected to the first metal contact (5); characterized in that: The following steps are included: S1: Install the fixing rod (1) to the spindle of the CNC machine tool so that the axis of the fixing rod (1) coincides with the axis of the spindle of the CNC machine tool, and rotate the adjusting screw (12) to adjust the parallelism between the axis of the No. 1 metal contact (5) and the No. 2 metal contact (6) and the axis of the fixing rod (1); S2: The workpiece to be processed is fixed on the table of a CNC machine tool, the workpiece having at least two detection surfaces, the CNC machine tool drives the two-point edge finder to move, so that the first metal contact (5) contacts the first detection surface of the workpiece first, after the first metal contact (5) contacts the first detection surface, the two-point edge finder rotates around the main axis of the machine tool, and drives the second metal contact (6) to slowly approach the first detection surface of the workpiece with a step distance of 0.1 mm, until the second metal contact (6) contacts the first detection surface of the workpiece, the workpiece is a metal part, the internal circuit of the edge finder is turned on, the indicator light (17) is lit, and then the second metal contact (6) is retreated with a step distance of 0.01 mm until the indicator light (17) is off, and finally the second metal contact (6) is slowly approached with a step distance of 0.001 mm until the indicator light (17) just lights up, and the movement is stopped, and the CNC machine tool records the coordinates of the first detection surface; S3: Repeat step S2 to record the coordinates of all the detection surfaces, and then calculate the center coordinates of the workpiece.

10. The method for using the two-point edge finder according to claim 9, characterized in that: The workpiece includes a cuboid workpiece, an inner square hole workpiece, a cylindrical workpiece or an inner circular hole workpiece; When the workpiece is a rectangular workpiece, the four sides A, B, C, and D of the rectangular workpiece are detection surfaces. The coordinates of the side A are measured as X1, the coordinates of the side B are measured as X2, the coordinates of the side C are measured as Y1, and the coordinates of the side D are measured as Y2. The geometric center (X, Y) of the top surface of the rectangular workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2. When the workpiece is an inner square hole workpiece, the four inner side surfaces A, B, C, and D of the inner square hole workpiece are detection surfaces. The coordinates of the side surface A are measured as X1, the coordinates of the side surface B are measured as X2, the coordinates of the side surface C are measured as Y1, and the coordinates of the side surface D are measured as Y2. The geometric center (X, Y) of the inner hole of the inner square hole workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2. When the workpiece is a cylindrical workpiece, the outer circumference of the cylindrical workpiece is divided into four symmetrical detection surfaces, and the coordinates of two symmetrical detection surfaces are detected respectively, marked as X1 and X2. The Y coordinate should be kept unchanged during the detection of X1 and X2. Then the coordinates of the other two symmetrical detection surfaces are detected respectively, marked as Y1 and Y2. The X coordinate should be kept unchanged during the detection of Y1 and Y2. The geometric center (X, Y) of the top surface of the cylindrical workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2. When the workpiece is an inner hole workpiece, the inner circumference of the inner hole workpiece is divided into four symmetrical detection surfaces, and the coordinates of two symmetrical detection surfaces are detected respectively, marked as X1 and X2. The Y coordinate should be kept unchanged during the detection of X1 and X2. Then the coordinates of the other two symmetrical detection surfaces are detected respectively, marked as Y1 and Y2. The X coordinate should be kept unchanged during the detection of Y1 and Y2. The geometric center (X, Y) of the inner hole of the inner hole workpiece is calculated by X=(X1+X2) / 2 and Y=(Y1+Y2) / 2.

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