A centering device for a fast wire-cut electrical discharge machine and its centering method

Abstract

The present invention relates to the field of fast wire cutting machining, and particularly to a centering device for a fast wire cutting machine tool and a centering method thereof. The centering device includes a power source, an indicating member, and a contact member. The power source and the indicating member are both arranged on a workbench, and the indicating member is electrically connected to the power source. The contact members are respectively arranged on a cutting wire seat and a metal fitting to be cut, and the contact members are electrically connected to the power source. This application has the effect of improving the cutting accuracy of metal fittings.

Description

Technical Field

[0001] The present invention relates to the field of fast-wire electrical discharge machining, and more particularly to a centering device and a centering method for a fast-wire electrical discharge machining tool. Background Art

[0002] Fast-wire electrical discharge machining is a type of electrical discharge wire cutting, also known as a high-speed wire electrical discharge machining tool. It has a fast machining speed and is an original electrical discharge wire cutting machining mode in China.

[0003] Currently, in the mold manufacturing industry, it is often necessary to use fast-wire electrical discharge machining to cut metal fittings of some molds. During cutting, the metal fitting to be cut needs to be placed on the workbench first, and then the distance between the cutting wire and both sides of the workpiece is adjusted to make the distances on both sides consistent, so as to reduce the situation of asymmetric cutting on both sides of the metal fitting when using the cutting wire to cut the metal fitting later.

[0004] To reduce the situation of asymmetric cutting on both sides of the metal fitting, before adjusting the position of the cutting wire, the worker needs to first find the center of the metal fitting to be cut, that is, to center the metal fitting to be cut. During operation, first make the cutting wire run, then move one side of the cutting wire seat so that the cutting wire on one side of the cutting wire seat contacts one side of the metal fitting and generates an electric spark to determine the edge position dimension of one side of the metal fitting. Then move the cutting wire seat on the other side so that the cutting wire on the other side of the cutting wire seat contacts the other side of the metal fitting and generates an electric spark to determine the edge position dimension of the other side of the metal fitting. Finally, add the two edge position dimensions and divide by 2 to obtain the center position dimension of the metal fitting.

[0005] Regarding the above related technologies, the inventor believes that since the existing centering method directly observes the size of the electric spark with the human eye to determine the edge position dimension of the metal fitting, this observation method mainly relies on the experience of the worker, resulting in a large error when the worker determines the edge position dimension of the metal fitting, which affects the accuracy of the subsequent cutting of the metal fitting by the cutting wire. Summary of the Invention

[0006] In order to effectively improve the accuracy of cutting metal fittings, the present application provides a centering device and a centering method for a fast-wire electrical discharge machining tool.

[0007] In a first aspect, the present application provides a centering device for a fast-wire electrical discharge machining tool, adopting the following technical solution:

[0008] A centering device for a fast-wire electrical discharge machining tool, comprising a power source, an indicating member and a contact member. The power source and the indicating member are both disposed on a workbench, and the indicating member is electrically connected to the power source. The contact members are respectively disposed on a cutting wire base and a metal fitting to be cut, and the contact members are electrically connected to the power source.

[0009] By adopting the above technical solution, the power source is used to provide electrical energy in this application, the indicating member is used to provide a feedback signal during centering, and the contact members are used to be respectively connected to the cutting wire base and the metal fitting to be cut, so as to form a closed loop among the power source, the indicating member, the cutting wire base and the metal fitting to be cut. Thus, when the cutting wire touches the metal fitting to be cut, an energized circuit is formed, and a feedback signal appears on the indicating member. At this time, the worker can immediately know that the cutting wire touches the metal fitting to be cut by observing the feedback signal, and determine the position dimension of one side of the metal fitting to be cut. Then, the same method is used to determine the position dimension of the other side of the metal fitting to be cut, and then the middle dimension of the metal fitting to be cut is determined by calculation.

[0010] Compared with the method of directly centering the metal fitting to be cut by observing the size of the electric spark, this application can accurately feedback signals through the indicating member when the cutting wire just touches, reducing the human interference factors, thus effectively reducing the error generated during centering and improving the accuracy of subsequent cutting of the metal fitting to be cut.

[0011] Preferably, transmission wires are disposed on both sides of the power source, and the indicating member and the contact members are electrically connected to the power source through the transmission wires.

[0012] By adopting the above technical solution, the transmission wires are used to realize the electrical connection among the power source, the indicating member, the cutting wire base and the metal fitting to be cut. When the cutting wire touches the side wall of the metal fitting to be cut, the electrical signal can be quickly transmitted to the indicating member, so as to determine the position dimension of the side wall of the metal fitting to be cut by observing the feedback signal of the indicating member.

[0013] Preferably, a connection assembly is disposed on the contact member, and the contact member is electrically connected to the transmission wire through the connection assembly.

[0014] By adopting the above technical solution, the connection assembly is used to realize the electrical connection between the transmission wire and the contact member, which can effectively improve the connection stability between the transmission wire and the contact member, and thus further reduce the error during centering the metal fitting to be cut.

[0015] Preferably, the connection assembly includes a locking member and a clamping member. The locking member is connected to the transmission wire, and the clamping member is connected to the contact member.

[0016] By adopting the above technical solution, the locking member is used to lock the conductive wire on the connecting component, and the clamping member is used to fix the connecting component and the contact member, thereby achieving the purpose of effectively improving the stability of the conductive wire and the contact member when electrically connected.

[0017] Preferably, the locking member includes a mounting block and a clamping rod, the mounting block is arranged on the side of the clamping member away from the contact member, a first mounting hole is opened on the side of the mounting block away from the clamping member, a second mounting hole is opened on one side of the mounting block, the clamping rod is arranged in the second mounting hole, and the clamping rod is slidably fitted with the second mounting hole, the first mounting hole is connected to the second mounting hole, and the first mounting hole is slidably fitted with an end of the conductive wire away from the power source.

[0018] By adopting the above technical solution, the clamping rod connected to the second mounting hole is screwed in the direction close to the first mounting hole, which can be used to clamp and limit the conductive wire inserted into the first mounting hole, thereby effectively improving the connection stability of the conductive wire.

[0019] Preferably, the clamping member includes a fixing bar, a clamping bar and a supporting bar, the fixing bar is connected to the mounting block, the clamping bar is respectively arranged at both ends of the fixing bar, and the clamping bar is connected to the side wall of the contact member, the supporting bar is arranged on one side of the fixing bar, and the end of the supporting bar away from the fixing bar abuts against the contact member.

[0020] By adopting the above technical solution, the fixing strip is used to connect with the mounting block, and the clamping strip is used to install the fixing strip on the contact piece. While improving the stability of the entire connecting assembly on the contact piece, it is also beneficial to enhance the connection stability between the conductive wire and the contact piece. In addition, the two ends of the supporting strip are respectively abutted against the contact piece and the fixing strip, which can be used to further improve the overall stability of the connecting assembly, thereby more effectively enhancing the stability of the electrical connection between the conductive wire and the contact piece, thereby further reducing the error generated when centering the metal accessories to be cut.

[0021] Preferably, the clamping member is provided with a connecting hole, both ends of the connecting hole are through-set, one end of the connecting hole is connected to the first mounting hole, and the connecting hole is slidably fitted with an end of the conductive wire away from the power source.

[0022] By adopting the above technical solution, the connection hole allows the conductive wire to be inserted, so that the end of the conductive wire can directly contact the contact piece, thereby effectively improving the electrical signal transmission speed between the contact piece and the conductive wire, and further improving the efficiency of centering the metal accessories to be cut.

[0023] Preferably, a shock absorbing component is provided at one end of the support bar close to the contact piece, and a side of the shock absorbing component away from the support bar is in conflict with the contact piece.

[0024] By adopting the above technical solution, the damping assembly is used to absorb the vibration generated when the metal fitting to be cut contacts the cutting wire, so as to effectively reduce the vibration received by the connecting assembly, and further facilitate the stability of the signal transmission between the transmission wire and the contact member.

[0025] Preferably, the contact member is a magnetic iron block.

[0026] By adopting the above technical solution, the magnetic iron block can be used to quickly connect with the cutting wire seat and the metal fitting to be cut, so as to further improve the efficiency of centering the metal fitting to be cut.

[0027] In a second aspect, the present application provides a centering method for a centering device used in a fast wire cutting machine tool, adopting the following technical solution:

[0028] S1: Install two contact members on the cutting wire seat and the metal fitting to be cut respectively;

[0029] S2: Electrically connect the indicating member, the power source and the two contact members through a transmission wire;

[0030] S3: Adjust the position of the cutting wire seat to make the cutting wire seat drive the cutting wire to approach one side of the metal fitting to be cut. When the indicating member shows, record the edge position dimension of this side of the metal fitting to be cut at this time, denoted as the initial dimension 0;

[0031] S4: Adjust the cutting wire seat to the other side of the metal fitting to be cut, and make the cutting wire seat drive the cutting wire to approach the other side of the metal fitting to be cut. When the indicating member shows, record the edge position dimension of the other side of the metal fitting to be cut at this time, denoted as a;

[0032] S5: Subtract the edge position dimension 0 obtained in S3 from the edge position dimension a obtained in S4 and then divide by 2 to obtain the center position dimension of the metal fitting to be cut, and complete the centering of the metal fitting to be measured.

[0033] By adopting the above technical solution, an electric circuit can be quickly generated among the power source, the metal fitting to be cut and the cutting wire seat, which can effectively improve the centering efficiency of the fitting to be cut before wire cutting, and at the same time is conducive to reducing the error generated during centering, thus effectively improving the accuracy of wire cutting.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. Compared with the method of centering the metal fitting to be cut by directly observing the size of the electric spark, the present application can accurately feedback signals through the indicator when the cutting wire just touches, reducing human interference factors, thus effectively reducing the error generated during centering and improving the accuracy when cutting the metal fitting to be cut subsequently;

[0036] 2. By setting up a power source, it can be used to provide electrical energy, the indicator is used to provide feedback signals during centering, and the contact is used to connect to the cutting wire base and the metal fitting to be cut respectively, so as to form a closed circuit among the power source, the indicator, the cutting wire base and the metal fitting to be cut. Thus, when the cutting wire touches the metal fitting to be cut, an energized circuit is formed and the indicator gives a feedback signal. At this time, the worker can immediately know that the metal fitting to be cut touches the cutting wire by observing the feedback signal, and determine the position dimension on one side of the metal fitting to be cut. Then, the same method is used to determine the position dimension on the other side of the metal fitting to be cut, and then the middle dimension of the metal fitting to be cut is determined by calculation;

[0037] 3. By setting up a connection component, it can be used to realize the electrical connection between the transmission wire and the contact, effectively improving the connection stability between the transmission wire and the contact, and further reducing the error during centering the metal fitting to be cut;

[0038] 4. By using the centering method steps of the present application to center the metal fitting to be cut, an electrical circuit can be quickly generated among the power source, the fitting to be cut and the cutting wire base, effectively improving the centering efficiency of the fitting to be cut before wire cutting, and at the same time helping to reduce the error generated during centering, thus effectively improving the accuracy during subsequent wire cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is the overall structural schematic diagram of the fast - moving wire cutting machine tool and the centering device in the embodiment of the present application;

[0040] Figure 2 is Figure 1 the enlarged view of part A in

[0041] Figure 3 is the exploded structural schematic diagram of the connection component and the shock - absorbing component as a whole in the embodiment of the present application.

[0042] DESCRIPTION OF THE REFERENCE NUMERALS:

[0043] 1. Power source; 11. Conductive wire; 2. Indicator; 3. Contact; 31. Connection assembly; 311. Locking piece; 3111. Mounting block; 3112. Tightening rod; 3113. First mounting hole; 3114. Second mounting hole; 312. Clamping piece; 3121. Fixed strip; 3122. Clamping strip; 3123. Support strip; 3124. Connection hole; 3125. Screw; 3126. Threaded hole; 3127. Limiting hole; 3128. Guide hole; 4. Workbench; 5. Cutting wire seat; 6. Metal fitting to be cut; 7. Shock absorption assembly; 71. Elastic piece; 72. Contact block; 8. Anti-slip cushion block. Detailed implementation mode

[0044] The following will further elaborate on this application in conjunction with the attached Figures 1-3 drawings.

[0045] This embodiment of the application discloses a centering device for a fast wire cutting machine tool. Referring to Figure 1 , the centering device includes a power source 1 and an indicator 2. Among them, both the power source 1 and the indicator 2 are installed on the workbench 4 of the fast wire cutting machine tool.

[0046] At the same time, a metal fitting 6 to be cut is installed on the workpiece seat of the fast wire cutting machine tool. Among them, contacts 3 are installed on both the cutting wire seat 5 and the metal fitting 6 to be cut of the fast wire cutting machine tool.

[0047] In addition, referring to Figure 1 , in order to realize the electrical connection among the power source 1, the indicator 2 and the contact 3, conductive wires 11 are installed at the output end and the input end of the power source 1 and the output end of the indicator 2. Among them, the end of the conductive wire 11 on the side of the input end of the power source 1 away from the power source 1 is electrically connected to the contact 3 on the cutting wire seat 5.

[0048] Furthermore, the end of the conductive wire 11 on the side of the output end of the power source 1 away from the power source 1 is electrically connected to the input end of the indicator 2. At the same time, the end of the conductive wire 11 on the side of the output end of the indicator 2 away from the indicator 2 is electrically connected to the metal fitting 6 to be cut. Among them, in this embodiment, the power source 1 can be selected as a battery, the indicator 2 can be selected as a light bulb, and the contact 3 can be selected as a magnetic iron block.

[0049] When the worker needs to center the metal fitting 6 to be cut, first move the cutting wire on one side of the metal fitting 6 to be cut closer to the metal fitting 6 to be cut. After the cutting wire contacts one side wall of the metal fitting 6 to be cut, stop moving the cutting wire seat 5. At this time, a closed circuit is formed among the battery, the light bulb and the two magnetic iron blocks, and the current flows through the light bulb to make the light bulb light up. After the worker observes that the light bulb lights up, record the position dimension on one side of the metal fitting 6 to be cut at this time.

[0050] Next, the worker needs to move the cutting line to the other side of the metal fitting 6 to be cut, and make the cutting line approach the other side of the metal fitting 6 to be cut. After the cutting line contacts the side wall of one side of the metal fitting 6 to be cut, the cutting line seat 5 stops moving. At this time, a closed circuit is formed among the battery, the bulb and the two magnetic iron blocks, and the current flows through the bulb to make the bulb light up. After the worker observes that the bulb lights up, the position dimension of the other side of the metal fitting 6 to be cut at this time is recorded. Finally, the worker can calculate the central position dimension of the metal fitting 6 to be cut, effectively reducing the error generated during the centering of the metal fitting 6 to be cut, thus facilitating the subsequent precise cutting of the metal fitting 6 to be cut by the worker.

[0051] Referring to Figure 2 and Figure 3 , in order to improve the electrical connection stability between the transmission wire 11 and the contact 3, a connection component 31 is provided between the transmission wire 11 and the contact 3. And in this embodiment, the connection component 31 includes a locking member 311 and a clamping member 312. Among them, the clamping member 312 is installed on the side wall of the contact 3, the locking member 311 is installed on the side of the clamping member 312 away from the contact 3, and the locking member 311 is connected to the transmission wire 11.

[0052] In this embodiment, the clamping member 312 includes a fixing strip 3121 and a clamping strip 3122. Among them, one side wall of the fixing strip 3121 abuts against the side wall of the contact 3. At the same time, guiding holes 3128 are respectively opened at both ends of the fixing strip 3121. In addition, there are two clamping strips 3122, and the two clamping strips 3122 are respectively installed in the two guiding holes 3128, and the two clamping strips 3122 are both in sliding plug fit with the guiding holes 3128 at the corresponding positions. Among them, the cross sections of the two clamping strips 3122 are both L-shaped, and the ends of the clamping strips 3122 away from the guiding holes 3128 extend towards the direction close to the contact 3.

[0053] Referring to Figure 2 and Figure 3 , in order to limit the two clamping strips 3122, a plurality of limiting holes 3127 are opened on the side of the fixing strip 3121 away from the contact 3. The plurality of limiting holes 3127 are all communicated with the guiding holes 3128, and the plurality of limiting holes 3127 are arranged at equal intervals along the length direction of the fixing strip 3121. In addition, a threaded hole 3126 is opened on the side of the clamping strip 3122 close to the limiting hole 3127. The threaded hole 3126 is communicated with the limiting hole 3127. At the same time, a screw 3125 is threadedly connected to the threaded hole 3126, and the end of the screw 3125 away from the threaded hole 3126 is in sliding plug fit with the limiting hole 3127.

[0054] When a worker needs to install the fixing strip 3121 on the side wall of the contact 3, the positions of the two clamping strips 3122 can be adjusted according to the size of the contact 3. First, slide the two clamping strips 3122 along the extension directions of the guiding holes 3128 at the corresponding positions respectively, so that the two clamping strips 3122 are respectively abutted against the two side walls of the contact 3. Then, pass the screw 3125 through the limiting hole 3127 that coincides with the position of the threaded hole 3126, and make one end of the screw 3125 passing through the limiting hole 3127 be threadedly connected with the threaded hole 3126, thereby locking the positions of the two clamping strips 3122, achieving the purpose of quickly installing the fixing strip 3121 on the side wall of the contact 3.

[0055] Referring to Figure 3 , in this embodiment, the locking member 311 includes an installation block 3111 and an abutting rod 3112. Among them, the installation block 3111 is installed on the side of the fixing strip 3121 away from the contact 3. At the same time, a second installation hole 3114 is opened at the top of the installation block 3111, and the abutting rod 3112 is threadedly connected in the second installation hole 3114.

[0056] In addition, a first installation hole 3113 is opened on the side of the installation strip away from the fixing strip 3121, and the first installation hole 3113 is communicated with the second installation hole 3114. At the same time, the first installation hole 3113 is in sliding plug fit with the transmission wire 11. In addition, a connection hole 3124 is penetrated through the fixing strip 3121, and the connection hole 3124 is communicated with the first installation hole 3113.

[0057] When a worker needs to connect the transmission wire 11 to the contact 3 through the connection assembly 31, first, the end of the transmission wire 11 far from the power source 1 needs to be inserted from the first installation hole 3113, and the transmission wire 11 is sequentially passed through the first installation hole 3113 and the connection hole 3124 until the end of the transmission wire 11 far from the power source 1 contacts the side wall of the contact 3. Then, screw the abutting rod 3112 into the second installation hole 3114 in the direction close to the first installation hole 3113, and make the end of the abutting rod 3112 inserted into the first installation hole 3113 abut against the outer surface of the transmission wire 11, thereby realizing the electrical connection between the transmission wire 11 and the contact 3.

[0058] Referring to Figure 2 and Figure 3 , in order to further effectively improve the connection stability between the contact 3 and the transmission wire 11, a support strip 3123 is hinged at the bottom of the fixing strip 3121. At the same time, a shock absorption assembly 7 is provided at the end of the support strip 3123 away from the fixing strip 3121.

[0059] In this embodiment, the shock absorbing assembly 7 includes an elastic member 71 and a resistance block 72, wherein a plurality of elastic members 71 are provided, and one end of each of the plurality of elastic members 71 is connected to one end of the support bar 3123 away from the fixed bar 3121, and at the same time, one side of the resistance block 72 is connected to one end of the plurality of elastic members 71 away from the support bar 3123. In this embodiment, the elastic member 71 may be a spring.

[0060] After the worker has pressed the two clamping strips 3122 against the contact piece 3, he then rotates the support strip 3123 so that the side of the abutment block 72 facing away from the elastic piece 71 is pressed against the side wall of the contact piece 3, thereby effectively improving the connection stability between the contact piece 3 and the conductive line 11 and helping to reduce the vibration transmitted from the contact piece 3.

[0061] In addition, refer to Figure 3 In order to further effectively improve the overall installation stability of the connecting component 31, anti-slip pads 8 are installed on the sides of the clamping strip 3122 and the abutment block 72 that are in contact with the contact piece 3, thereby effectively increasing the friction between the overall connecting component 31 and the side wall of the contact piece 3, so as to achieve the purpose of improving the connection stability between the conductive wire 11 and the contact piece 3.

[0062] The present application also discloses a method for centering a centering device for a high-speed wire cutting machine tool:

[0063] S1: The two contact members 3 are magnetically attracted to the positions corresponding to the cutting wire holder 5 and the metal fittings 6 to be cut;

[0064] S2: Install two connection components 31 on the side walls of two contact members 3 respectively;

[0065] S3: electrically connecting the indicator 2, the power source 1 and the two contact members 3 through the conductive wire 11;

[0066] S4: Adjust the position of the cutting wire holder 5 so that the cutting wire holder 5 drives the cutting wire to approach one side of the metal fitting 6 to be cut. When the indicator 2 starts to light up, the cutting wire holder 5 stops moving and the edge position size of one side of the metal fitting 6 to be cut is recorded as the initial size 0.

[0067] S5: Adjust the cutting wire holder 5 to the other side of the metal fitting 6 to be cut, so that the cutting wire holder 5 drives the cutting wire to approach the other side of the metal fitting 6 to be cut. When the indicator 2 starts to light up, the cutting wire holder 5 stops moving, and the edge position size of the other side of the metal fitting 6 to be cut is recorded, which is recorded as a.

[0068] S6: Subtract the edge position dimension 0 obtained in S4 from the edge position dimension a obtained in S5, and then divide the result by 2 to obtain the center position dimension of the metal fitting 6 to be cut, thereby completing the centering of the metal fitting 6 to be cut.

[0069] The above are all preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A center divider for fast wire cutting machine tools, Features: The invention comprises an electric power source (1), an indicator (2) and a contact member (3), wherein the electric power source (1) and the indicator (2) are both arranged on a workbench (4), and the indicator (2) is electrically connected to the electric power source (1); the contact member (3) is respectively arranged on a cutting wire holder (5) and a metal accessory (6) to be cut, and the contact member (3) is electrically connected to the electric power source (1); Conductive wires (11) are provided on both sides of the power source (1), and the indicator (2) and the contact member (3) are electrically connected to the power source (1) via the conductive wires (11); The contact piece (3) is provided with a connection component (31), and the contact piece (3) is electrically connected to the conductive line (11) via the connection component (31); The connection assembly (31) comprises a locking member (311) and a clamping member (312), wherein the locking member (311) is connected to the conductive wire (11), and the clamping member (312) is connected to the contact member (3); The clamping member (312) comprises a fixing bar (3121), a clamping bar (3122) and a supporting bar (3123); the supporting bar (3123) is arranged on one side of the fixing bar (3121), and one end of the supporting bar (3123) away from the fixing bar (3121) abuts against the contact member (3); A shock absorbing component (7) is provided at one end of the support bar (3123) close to the contact piece (3), and a side of the shock absorbing component (7) away from the support bar (3123) is in contact with the contact piece (3); The shock absorbing assembly (7) comprises an elastic member (71) and a resistance block (72); a plurality of elastic members (71) are provided, and one end of each of the plurality of elastic members (71) is connected to an end of the support bar (3123) away from the fixing bar (3121); and one side of the resistance block (72) is connected to an end of each of the plurality of elastic members (71) away from the support bar (3123).

2. A centering device for a high-speed wire cutting machine according to claim 1, Features: The locking member (311) comprises a mounting block (3111) and a clamping rod (3112); the mounting block (3111) is arranged on a side of the clamping member (312) away from the contact member (3); a first mounting hole (3113) is provided on a side of the mounting block (3111) away from the clamping member (312); a second mounting hole (3114) is provided on one side of the mounting block (3111); the clamping rod (3112) is arranged in the second mounting hole (3114); the clamping rod (3112) and the second mounting hole (3114) are slidably fitted; the first mounting hole (3113) and the second mounting hole (3114) are connected; and the first mounting hole (3113) and the end of the conductive wire (11) away from the power source (1) are slidably fitted.

3. A center divider for a high-speed wire cutting machine according to claim 2, Features: The fixed strip (3121) is connected to the mounting block (3111). The clamping strips (3122) are respectively arranged at both ends of the fixed strip (3121), and the clamping strips (3122) are connected to the side wall of the contact member (3).

4. A centering device for a fast wire cutting machine tool according to claim 2, characterized in that: The clamping member (312) is provided with a connection hole (3124). Both ends of the connection hole (3124) are through holes. One end of the connection hole (3124) communicates with the first mounting hole (3113), and the connection hole (3124) is in sliding fit with the end of the transmission wire (11) away from the power source (1).

5. A centering device for a fast wire cutting machine tool according to claim 1, characterized in that: The contact member (3) is a magnetic iron block.

6. A centering method for a centering device of a fast wire cutting machine tool, using a centering device for a fast wire cutting machine tool according to any one of claims 1-5, characterized in that: It includes the following steps: S1: Mount the two contact members (3) on the cutting wire seat (5) and the metal fitting to be cut (6) respectively; S2: Electrically connect the indicating member (2), the power source (1) and the two contact members (3) through the transmission wire (11); S3: Adjust the position of the cutting wire seat (5) so that the cutting wire seat (5) drives the cutting wire to approach one side of the metal fitting to be cut (6). When the indicating member (2) shows, record the edge position dimension of one side of the metal fitting to be cut (6) at this time, denoted as the initial dimension 0; S4: Adjust the cutting wire seat (5) to the other side of the metal fitting to be cut (6) so that the cutting wire seat (5) drives the cutting wire to approach the other side of the metal fitting to be cut (6). When the indicating member (2) shows, record the edge position dimension of the other side of the metal fitting to be cut (6) at this time, denoted as a; S5: Subtract the edge position dimension 0 obtained in S3 from the edge position dimension a obtained in S4 and then divide the result by 2 to obtain the center position dimension of the metal fitting to be cut (6), and complete the centering of the metal fitting to be measured.

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