Wire sawing efficiency improving device and method of using the same

Abstract

The application discloses a workpiece linear cutting efficiency improving device, which comprises a base plate and a dividing disc, the dividing disc is connected with the base plate, the base plate is provided with a through hole and a tool setting groove at the edge, the dividing disc is provided with a main dividing hole corresponding to the position of the through hole, the dividing disc is provided with a plurality of auxiliary dividing holes taking the main dividing hole as a reference, the position relationship between the main dividing hole and the auxiliary dividing hole corresponds to a plurality of cutting positions of the workpiece; when the main dividing hole coincides with the through hole, the dividing disc is provided with a main escape groove at the corresponding position of the tool setting groove; the dividing disc is further provided with a plurality of auxiliary escape grooves, each auxiliary escape groove corresponds to an auxiliary dividing hole, and the included angle between each auxiliary escape groove and the corresponding auxiliary dividing hole is equal to the included angle between the main dividing hole and the main escape groove; the dividing disc is provided with a positioning disc, the positioning disc is provided with a stop opening for placing the workpiece, and the positioning disc is provided with a pressing plate; the positioning disc and the pressing plate are both circumferentially provided with escape grooves with the same positions as the main escape groove and the auxiliary escape groove of the dividing disc; the dividing disc, the positioning disc and the pressing plate are correspondingly provided with at least two connecting holes, guide columns are arranged in the connecting holes to fix the positions of the three.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a wire EDM efficiency improvement device and its usage method. Background Technology

[0002] Wire EDM machines control the travel of molybdenum wire through a wire EDM CNC program to achieve machining. The molybdenum wire feeding is divided into manual feeding and feeding according to the program. Both of these feeding methods are relatively slow and have low workpiece processing efficiency.

[0003] During processing, the operator typically moves the molybdenum wire by hand to the processing position to cut the workpiece. If there are several cutting positions, the operator needs to manually crank the control handle to move the molybdenum wire several times to cut the part. (See attached instruction manual) Figure 1 Taking the workpiece as an example, traditional wire EDM devices such as Figure 10 The processing procedure is as follows:

[0004] 1. Fix the wire EDM device onto the machine tool, straighten the fixture to find the front and align the center point of the fixture positioning circle P surface, and ensure that the center and placement direction of the fixture are consistent with the coordinate system of the wire EDM program.

[0005] 2. Clamp the workpiece and align the inner hole of the workpiece so that the center of the workpiece coincides with the center of the fixture. This center is the origin of the wire EDM program coordinate system.

[0006] 3. Retrieve the wire EDM program. The molybdenum wire starts from the program origin and performs three machining operations on the workpiece along wire path 1, wire path 2, and wire path 3.

[0007] As can be seen from the above processing, the traditional wire EDM device has a long idle wire travel and a slow speed, which seriously affects the workpiece processing efficiency.

[0008] Patent CN104289780B discloses a wire EDM fixture for machining circumferential narrow grooves, including a support base, a fixed plate, an indexing plate, a support plate, a main rotating shaft, and a secondary rotating shaft. The fixed plate is vertically connected to the support base. The main rotating shaft passes through the fixed plate and the indexing plate in sequence. A support plate is located outside the indexing plate, and the secondary rotating shaft passes through the indexing plate and the support plate in sequence. The indexing plate and the fixed plate are respectively provided with a communicating main slot and a main blind hole, with a main compression spring carrying a main steel ball inside the main blind hole. The support plate and the indexing plate are respectively provided with communicating secondary slots and secondary blind holes, with secondary compression springs carrying secondary steel balls inside the secondary blind holes. This invention overcomes the shortcomings of existing wire EDM fixtures in machining circumferential narrow grooves, such as low efficiency, low machining accuracy, and complex operation, and provides a wire EDM fixture for machining circumferential narrow grooves with high machining efficiency, high accuracy, and simple operation.

[0009] Although the aforementioned patent also provides a wire EDM fixture for improving the efficiency of wire EDM, the fixture is designed for workpieces with an even number of cuts that are symmetrically distributed. When the number of cuts on the workpiece is odd and the cuts are irregularly distributed, it is obviously impossible to use the wire EDM fixture of this patent for processing. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a wire EDM efficiency improvement device that can process workpieces with irregular cutting distribution. This device can greatly shorten the wire EDM wire feed stroke and time, and significantly improve workpiece production efficiency.

[0011] The present invention also provides a method for using the above-mentioned wire cutting efficiency improvement device.

[0012] The objective of this invention is achieved through the following technical solution:

[0013] A workpiece wire EDM efficiency improvement device includes a base plate and an indexing plate mounted on the base plate. The center of the indexing plate is connected to the base plate via a mandrel. The base plate has tool setting grooves at its edges for tool setting during wire EDM. A through hole is also provided on the base plate at the location overlapping with the indexing plate. The indexing plate has main indexing holes corresponding to the positions of the through holes. Multiple secondary indexing holes are also provided on the indexing plate based on the main indexing holes. The total number of main and secondary indexing holes is equal to the number of cuts on the workpiece. The main indexing hole and multiple secondary indexing holes are located on the same pitch circle, and the positional relationship between the main indexing hole and the secondary indexing holes corresponds to multiple cutting points on the workpiece. When the main indexing hole coincides with the through hole of the base plate, a main relief slot is opened on the indexing plate at the corresponding position of the tool setting groove on the base plate. Multiple secondary relief slots are also opened on the indexing plate, and each secondary relief slot corresponds to a secondary indexing hole. The included angle between each secondary relief slot and its corresponding secondary indexing hole is equal to the included angle between the main indexing hole and the main relief slot.

[0014] The indexing plate is equipped with a positioning plate, and the positioning plate has a stop for placing the workpiece. The depth of the stop is adapted to the thickness of the workpiece. A pressure plate is set on the positioning plate. Both the positioning plate and the pressure plate have clearance slots in the same position as the main clearance slot and the secondary clearance slot on the indexing plate. At least two connecting holes are opened on the indexing plate, the positioning plate, and the pressure plate respectively. Guide posts are inserted into the connecting holes to fix the positions of the indexing plate, the positioning plate, and the pressure plate. Fasteners are provided on the ends of the guide posts that extend out of the end face of the pressure plate to press the pressure plate.

[0015] The indexing plate can rotate on the base plate, so that the main indexing hole and each secondary indexing hole are aligned with the through holes on the base plate and the pins are inserted, so as to perform wire cutting on each cutting point on the workpiece.

[0016] Furthermore, the multiple connecting holes on the indexing plate, positioning plate, and pressure plate are located on the same circumference.

[0017] Furthermore, multiple connecting holes are evenly distributed on the same circumference.

[0018] Furthermore, a stepped groove is provided on the end face of the indexing plate that contacts the base plate at the location of the connecting hole, and an end cap is provided at the end of the guide post that connects to the indexing plate. The end cap is located in the stepped groove, and the end cap and the stepped groove are connected by screws.

[0019] Furthermore, the mandrel and the indexing plate are fitted with a clearance of H7 / g6, and the end of the mandrel extending out of the indexing plate is locked by a fastening connector.

[0020] Furthermore, a washer is fitted on the shaft section between the indexing plate and the fastening connector.

[0021] Furthermore, there is a gap of 0.02 to 0.03 mm between the washer and the indexing plate.

[0022] Furthermore, a groove is opened on the bottom surface of the base plate away from the indexing plate at the mandrel mounting location. A shaft end step is provided at the end of the mandrel that connects to the base plate. The shaft end step is located in the groove, and the shaft end step is connected to the groove by screws.

[0023] Furthermore, multiple stacked positioning discs are provided between the indexing plate and the pressure plate.

[0024] A method of using the wire EDM efficiency improvement device as described above includes the following steps:

[0025] S1. Connect the base plate and the indexing plate with the mandrel, align the main indexing hole of the indexing plate with the through hole on the base plate and insert the pin (the guide post has been installed in the connecting hole of the indexing plate); align the reference, make the wire EDM efficiency improvement device aligned with the direction of the wire EDM program coordinate system, move the wire EDM molybdenum wire to the tool setting groove on the base plate, touch the two sides of the tool setting groove, and determine the position of the cutting center line;

[0026] S2. Insert the positioning plate containing the workpiece along the axial direction of the guide post, place the pressure plate along the axial direction of the guide post to contact the positioning plate, and install fasteners at the end of the guide post that extends out of the end face of the pressure plate.

[0027] S3. Align the main indexing hole and each secondary indexing hole on the indexing plate with the through hole on the base plate in sequence and insert the pin to lock them. Each time it is locked, the wire cutting molybdenum wire moves back and forth once along the center line of the tool groove on the base plate to complete one cut.

[0028] S4. After processing is completed, remove the pressure plate and take out the cut workpiece and positioning plate.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1) By setting an indexing plate, this invention simplifies the idle wire travel path and time of the molybdenum wire in the wire EDM machine to the circumferential rotation of the indexing plate. When the main indexing hole and each secondary indexing hole of the indexing plate rotate sequentially to align with the through hole of the base plate, the workpiece cutting position rotates to the center line of the tool groove on the base plate. The indexing plate is locked to the base plate by a pin. The wire EDM molybdenum wire only needs to move back and forth at the center line of the tool groove on the base plate to cut the workpiece. This greatly shortens the wire EDM travel and time, and can significantly improve the workpiece production and processing efficiency.

[0031] 2) The positions of the main indexing holes and the secondary indexing holes on the indexing plate correspond to the relative positions of the various cutting points on the workpiece, so that the efficiency-enhancing device of the present invention can be applied to the processing of workpieces with irregular cutting point distribution.

[0032] 3) Multiple positioning plates can be stacked on the indexing plate at one time, so that several workpieces can be processed at one time. When processing several workpieces, each cutting point only needs the molybdenum wire to move back and forth once in the tool setting groove, which further improves the efficiency of part processing. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the workpiece described in the background technology and Embodiment 1 of the present invention;

[0034] Figure 2 This is a top view of the connection between the indexing plate and the base plate as described in Embodiment 1 of the present invention;

[0035] Figure 3 This is a front sectional view of the connection between the indexing plate and the base plate as described in Embodiment 1 of the present invention;

[0036] Figure 4 This is a top view of the base plate described in Embodiment 1 of the present invention;

[0037] Figure 5 This is a top view of the indexing plate described in Embodiment 1 of the present invention;

[0038] Figure 6 This is a top view of the positioning disk described in Embodiment 1 of the present invention;

[0039] Figure 7 This is a front cross-sectional view of the positioning disk described in Embodiment 1 of the present invention;

[0040] Figure 8 This is a top view of the efficiency-enhancing device according to Embodiment 1 of the present invention with the workpiece clamped.

[0041] Figure 9 for Figure 8 EE view;

[0042] Figure 10 This is a schematic diagram of the structure of a traditional wire cutting device in the background art. Detailed Implementation

[0043] To clearly illustrate the technical features of this solution, the following detailed description, in conjunction with the accompanying drawings, will explain the technical solution in detail.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0045] Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0048] Example 1

[0049] A workpiece wire EDM efficiency improvement device, targeting such Figure 1 The workpiece type shown has multiple cuts. The efficiency-enhancing device includes a base plate 1 and an indexing plate 2 mounted on the base plate, such as... Figure 2 and Figure 3 As shown, the indexing plate 2 is connected to the base plate 1 via a spindle 3. The indexing plate 2 needs to be able to rotate around the spindle 3 under manual operation. The spindle 3 and the indexing plate 2 are fitted with a clearance of H7 / g6. The end of the spindle 3 extending out of the indexing plate 2 is locked by a fastening connector 41, which is a shouldered hexagonal nut. A groove is opened on the bottom surface of the base plate 1 away from the indexing plate 2 at the mounting position of the spindle 3. A shaft end step 31 is provided at the end of the spindle 3 that connects to the base plate 1. The shaft end step 31 is located in the groove and is connected to the groove by screws to ensure that the spindle 3 is stably set on the base plate 1 and to prevent movement.

[0050] like Figure 3 As shown, a washer 42 is also fitted on the shaft section of the mandrel 3 between the indexing plate 2 and the fastening connector 41. When the fastening connector 41 is tightened so that the mandrel 3 and the washer 42 are in contact, there must be a small gap between the indexing plate 2 and the washer 42. This small gap can ensure that the indexing plate can be rotated freely by manual operation without deviating too much from the initial position.

[0051] like Figure 4 As shown, the base plate 1 has a rectangular structure. A tool setting groove 11 for tool setting during wire cutting is formed on one edge of the base plate 1. A through hole 12 is also provided on the base plate 1 at the location where it overlaps with the indexing plate 2. Figure 2 and Figure 5See, the indexing plate 2 has a main indexing hole 21 corresponding to the position of the through hole 12. Multiple secondary indexing holes 22 are also formed on the indexing plate 2 based on the main indexing hole 21. The total number of main indexing holes 21 and secondary indexing holes 22 is equal to the number of cuts on the workpiece. The main indexing holes 21 and the multiple secondary indexing holes 22 are located on the same pitch circle, and the positional relationship between the main indexing holes and secondary indexing holes corresponds to the multiple cuts on the workpiece. Figure 2 As shown, when the main indexing hole 21 coincides with the through hole 12 of the base plate, a main relief slot 23 is opened on the indexing plate 2 at the corresponding position of the tool setting groove 11 on the base plate; in addition, multiple secondary relief slots 24 are also opened on the indexing plate 2, each secondary relief slot 24 is set with a secondary indexing hole 22, and the included angle between each secondary relief slot 24 and its corresponding secondary indexing hole 22 is equal to the included angle between the main indexing hole 21 and the main relief slot 23. Figure 5 Since the two secondary relief slots are too close together, the indexing plate portion between the two secondary relief slots can be removed together without affecting the operation of the indexing plate.

[0052] The indexing plate 2 is equipped with a positioning plate 5, such as Figure 6 and Figure 7 As shown, the positioning disk 5 has a stop 51 for placing the workpiece, and the depth of the stop is adapted to the thickness of the workpiece. A pressure plate 6 is provided on the positioning disk 5 (see pressure plate). Figure 8 and Figure 9 Both the positioning plate 5 and the pressure plate 6 have circumferentially spaced slots 56 that are in the same position as the main and secondary slots on the indexing plate.

[0053] See Figure 3 , Figure 5 , Figure 6 and Figure 9 The indexing plate, positioning plate, and pressure plate are provided with four connecting holes 256 evenly distributed on the same circumference. Guide pins 7 are inserted into the connecting holes to fix the positions of the indexing plate 2, positioning plate 5, and pressure plate 6. The end of the guide pin 7 that extends out of the end face of the pressure plate is provided with a fastener 81 to press the pressure plate 6. This end of the guide pin is a threaded end, and the fastener is a knurled nut.

[0054] On the end face of the indexing plate 2 that contacts the base plate 1, there is a stepped groove at the connection hole position. An end cap 71 is provided at the end of the guide post 7 that connects to the indexing plate 2. The end cap is located in the stepped groove. The end cap 71 is connected to the stepped groove by screws, so that the guide post 7 and the indexing plate 2 are stably connected.

[0055] The indexing plate 2 rotates on the base plate 1 by manual operation, so that the main indexing hole 21 and each secondary indexing hole 22 are aligned with the through hole 12 on the base plate and the pin 9 is inserted. During the rotation of the indexing plate 2, the positioning plate 5 above it rotates synchronously, so as to perform wire cutting on each cutting point on the workpiece in sequence. The secondary clearance slot 24 on the indexing plate and the clearance slot 56 on the positioning plate and the pressure plate ensure that when the indexing plate 2 rotates on the base plate 1 to the point where a certain secondary indexing hole 22 coincides with the through hole 12, cutting space is provided for wire cutting of the workpiece, avoiding damage to the indexing plate, positioning plate and pressure plate by wire cutting.

[0056] In addition to simplifying the idle wire travel path and time of the wire EDM machine to the circumferential rotation of the indexing plate, allowing the wire EDM wire to reciprocate only at the center line of the tool slot on the base plate to cut the workpiece, thus significantly shortening the wire EDM travel path and time and improving workpiece production efficiency, the efficiency-enhancing device in this embodiment can also stack multiple positioning plates containing workpieces. Figure 9 This involves stacking ten positioning discs to enable simultaneous wire cutting of multiple workpieces at a single point, thereby improving processing efficiency. When multiple positioning discs are stacked, each disc both positions the workpiece and secures the workpiece below it.

[0057] Example 2

[0058] A workpiece wire EDM efficiency improvement device, still referring to Embodiment 1, includes a base plate and an indexing plate disposed on the base plate, such as... Figure 2 and Figure 3 As shown, the indexing plate is connected to the base plate via a spindle. The indexing plate needs to be able to rotate around the spindle under manual operation. The spindle and the indexing plate are fitted with a clearance of H7 / g6. The end of the spindle extending out of the indexing plate is locked by a fastening connector, which is a shouldered hexagonal nut. A groove is opened on the bottom surface of the base plate away from the indexing plate at the spindle mounting location. A shaft end step is provided at the end of the spindle that connects to the base plate. The shaft end step is located in the groove and is connected to the groove by screws to ensure that the spindle is stably set on the base plate and to prevent movement.

[0059] like Figure 3 As shown, a washer is fitted on the shaft section between the indexing plate and the fastening connector. When the fastening connector is tightened to make the mandrel and the washer fit together, there needs to be a small gap between the indexing plate and the washer. This small gap ensures that the indexing plate can be freely rotated manually without deviating too much from its initial position. The difference between this embodiment and Embodiment 1 is that the gap between the washer and the indexing plate is specifically taken as 0.02 to 0.03 mm.

[0060] like Figure 4As shown, the base plate has a rectangular structure. A tool-setting groove for wire cutting is formed along one edge of the base plate. A through hole is also provided on the base plate where it overlaps with the indexing plate. Figure 2 and Figure 5 See, the indexing plate has main indexing holes corresponding to the positions of the through holes. Based on the main indexing holes, multiple secondary indexing holes are also formed on the indexing plate. The total number of main and secondary indexing holes is equal to the number of cuts on the workpiece. The main indexing holes and multiple secondary indexing holes are located on the same pitch circle, and the positional relationship between the main and secondary indexing holes corresponds to the multiple cuts on the workpiece. Figure 2 As shown, when the main indexing hole coincides with the through hole of the base plate, a main relief slot is opened on the indexing plate at the corresponding position of the tool setting groove on the base plate; in addition, multiple secondary relief slots are also opened on the indexing plate, each secondary relief slot is set with a secondary indexing hole, and the included angle between each secondary relief slot and its corresponding secondary indexing hole is equal to the included angle between the main indexing hole and the main relief slot.

[0061] The indexing plate is equipped with a positioning plate, such as Figure 6 and Figure 7 As shown, the positioning plate has a stop for placing the workpiece, and the depth of the stop is adapted to the thickness of the workpiece. A pressure plate is installed on the positioning plate (see pressure plate). Figure 8 and Figure 9 Both the positioning plate and the pressure plate have clearance slots in the same position as the main clearance slots and secondary clearance slots on the indexing plate.

[0062] See Figure 3 , Figure 5 , Figure 6 and Figure 8 The indexing plate, positioning plate, and pressure plate are provided with four connecting holes evenly distributed on the same circumference. Guide pins are inserted into the connecting holes to fix the positions of the indexing plate, positioning plate, and pressure plate. The end of the guide pin that extends out of the end face of the pressure plate is provided with a fastener to press the pressure plate. This end of the guide pin is a threaded end, and the fastener is a knurled nut.

[0063] On the end face of the indexing plate that contacts the base plate, there is a stepped groove at the connection hole position. An end cap is provided at the end of the guide post that connects to the indexing plate. The end cap is located in the stepped groove and is connected to the stepped groove by screws, so that the guide post and the indexing plate are stably connected.

[0064] The indexing plate rotates manually on the base plate, aligning the main indexing hole and each secondary indexing hole sequentially with the through holes on the base plate and inserting pins. During rotation, the indexing plate drives the positioning plate above it to rotate synchronously, allowing for sequential wire cutting of each cutting point on the workpiece. The recessed slots on the indexing plate, positioning plate, and pressure plate ensure that when the indexing plate rotates on the base plate until a certain secondary indexing hole coincides with a through hole, sufficient cutting space is provided for wire cutting of the workpiece, preventing damage to the indexing plate, positioning plate, and pressure plate during wire cutting.

[0065] Example 3

[0066] This embodiment provides a method for using the wire cutting efficiency improvement device in Embodiment 1, including the following steps:

[0067] S1. Preparatory work before processing

[0068] The base plate 1 and the indexing plate 2 are connected by the spindle 3, aligning the main indexing hole 21 of the indexing plate with the through hole 12 on the base plate and inserting the pin 9 (before connecting the base plate and the indexing plate, the guide post must be installed in the connecting hole of the indexing plate); before machining, the alignment is correct. Figure 8 The reference C in the figure is used to align the wire EDM efficiency improvement device with the direction of the wire EDM program coordinate system. The wire EDM molybdenum wire is moved to the tool setting groove 11 on the bottom plate and touches the two sides of the tool setting groove to determine the position of the cutting center line.

[0069] S2. Workpiece clamping

[0070] The positioning plate 5 containing the workpiece is inserted along the axial direction of the guide post 7. The pressure plate 6 is then inserted along the axial direction of the guide post 7 to contact the positioning plate 5. A knurled nut is installed at the end of the guide post 7 that extends beyond the end face of the pressure plate 6. At this point, the workpiece clamping is complete.

[0071] S3. Workpiece Machining

[0072] Align the main indexing hole 21 and each secondary indexing hole 22 on the indexing plate 2 with the through hole 12 on the base plate in sequence and insert the pin 9 to lock them. Each time it is locked, the wire cutting molybdenum wire moves back and forth once along the center line of the tool groove 11 on the base plate to complete one cut. The number of repetitions varies depending on the cutting requirements of different parts.

[0073] S4. Parts Disassembly

[0074] After processing is completed, loosen the knurled nut, remove the pressure plate 6, and take out the cut workpiece and positioning plate 5.

[0075] Obviously, the above embodiments are merely examples to clearly illustrate the technical solutions of the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A workpiece wire EDM efficiency improvement device, wherein the workpiece has multiple cutting points, characterized in that, The efficiency improving device comprises a base plate and a protractor disc arranged on the base plate, the center of the protractor disc is connected with the base plate through a core shaft, the base plate is provided with a tool setting groove for tool setting during wire cutting at the edge, the base plate is further provided with a through hole at the overlapping part with the protractor disc, the protractor disc is provided with a main index hole corresponding to the position of the through hole, the protractor disc is further provided with a plurality of auxiliary index holes based on the main index hole, the total number of the main index hole and the auxiliary index hole is equal to the number of cutting parts on the workpiece, the main index hole and the plurality of auxiliary index holes are located on the same index circle, and the positional relationship between the main index hole and the auxiliary index hole corresponds to the plurality of cutting parts on the workpiece; when the main index hole coincides with the through hole of the base plate, the protractor disc is provided with a main clearance groove at the corresponding position of the tool setting groove of the base plate; the protractor disc is further provided with a plurality of auxiliary clearance grooves, each auxiliary clearance groove is arranged corresponding to an auxiliary index hole, and the included angle between each auxiliary clearance groove and the corresponding auxiliary index hole is equal to the included angle between the main index hole and the main clearance groove; The protractor disc is provided with a positioning disc, the positioning disc is provided with a stopper for placing the workpiece, the depth of the stopper is matched with the thickness of the workpiece, and the positioning disc is provided with a pressing plate; The protractor disc, the positioning disc and the pressing plate are correspondingly provided with at least two connecting holes, a guide column is inserted into the connecting holes to fix the positions of the protractor disc, the positioning disc and the pressing plate, and the end of the guide column extending out of the end surface of the pressing plate is provided with a fastener to press the pressing plate; The protractor disc can rotate on the base plate, so that the main index hole and each auxiliary index hole are respectively aligned with the through hole on the base plate and inserted into a plug pin, so as to perform wire cutting on each cutting part on the workpiece; The arrangement of the auxiliary clearance groove on the protractor disc and the clearance groove on the positioning disc and the pressing plate can ensure that when the protractor disc is rotated to a certain auxiliary index hole coinciding with the through hole on the base plate, a cutting space is left for wire cutting on the workpiece, so as to avoid that the wire cutting hurts the protractor disc, the positioning disc and the pressing plate.

2. The wire cutting efficiency improving device according to claim 1, characterized in that, The plurality of connecting holes arranged on the protractor disc, the positioning disc and the pressing plate are located on the same circumference.

3. The wire cutting efficiency device of claim 2, wherein, The plurality of connecting holes are uniformly distributed on the same circumference.

4. The wire cutting efficiency device of claim 1, wherein, The end surface of the protractor disc contacting the base plate is provided with a stepped groove at the position of the connecting hole, the end of the guide column connected with the protractor disc is provided with an end cap, the end cap is located in the stepped groove, and the end cap and the stepped groove are connected through a screw.

5. The wire cutting efficiency device of claim 1, wherein, The core shaft and the protractor disc are in clearance fit with H7 / g6, and the end of the core shaft extending out of the protractor disc is locked through a fastening connecting piece.

6. The wire cutting efficiency device of claim 5, wherein, The core shaft is further sleeved with a gasket on the shaft section between the protractor disc and the fastening connecting piece.

7. The wire cutting efficiency device of claim 6, wherein, The clearance between the gasket and the protractor disc is 0.02-0.03mm.

8. The wire cutting efficiency device of claim 1, wherein, The bottom surface of the base plate away from the protractor disc is provided with a groove at the mounting position of the core shaft, the end of the core shaft connected with the base plate is provided with a shaft end step, the shaft end step is located in the groove, and the shaft end step and the groove are connected through a screw.

9. The wire cutting efficiency device of claim 1, wherein, A plurality of positioning discs are arranged between the protractor disc and the pressing plate.

10. A method of using the wire saw efficiency improving device according to any one of claims 1 to 9, characterized by, The method comprises the following steps: S1. The base plate and the protractor disc are connected through the core shaft, the main index hole of the protractor disc is aligned with the through hole on the base plate and inserted into a plug pin, the reference is found, the direction of the wire cutting efficiency improving device is consistent with the direction of the wire cutting program coordinate system, the wire cutting molybdenum wire is moved to the tool setting groove of the base plate, and the cutting center line position is determined by touching the two side surfaces of the tool setting groove. S2. The positioning disc with the workpiece is axially loaded along the guide column, the pressing plate is axially placed in contact with the positioning disc, and the fastener is installed at the end of the guide column extending from the end surface of the pressing plate; S3. The main index hole and each auxiliary index hole on the index disc are aligned with the bottom plate through hole in turn and the insertion pin is locked, and each time the wire cutting molybdenum wire moves back and forth along the center line of the bottom plate tool setting groove to complete a cutting; S4. After the machining is completed, the pressing plate is removed, and the cut workpiece and the positioning disc are taken out.

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