Special-shaped shaft clamp tool

Abstract

The utility model provides a special-shaped shaft clamp tool shaft which comprises a positioning shaft assembly and a shaft sleeve, and the positioning shaft assembly comprises a first positioning shaft and a second positioning shaft which are connected with each other; one end of the second positioning shaft penetrates through the special-shaped shaft hole to be detachably connected with the shaft sleeve, and a clamping space used for clamping the special-shaped shaft is formed between the inner side face of the first positioning shaft and the inner side face of the shaft sleeve; machine tool centre holes are formed in the outer end face of the first positioning shaft and the outer end face of the shaft sleeve respectively, the central axes of the two machine tool centre holes located in the outer end face of the first positioning shaft and the outer end face of the shaft sleeve respectively coincide, the central axes and the central axis of the second positioning shaft intersect at the center of the special-shaped shaft hole, and the included angle formed by the central axes and the central axis is an acute angle. Two times of the angle value of the included angle is complementary with the bending angle value of the special-shaped shaft. According to the tool, the machining and forming steps of the special-shaped bent shaft workpiece are simplified, the positioning precision in the machining process is improved, the machining efficiency is improved, and the workpiece machining rejection rate is reduced.

Description

Technical Field

[0001] The utility model relates to the field of auxiliary clamping equipment, in particular to a special-shaped shaft clamp tooling. Background Art

[0002] The external turning and grinding of special-shaped shaft parts are difficult and the scrap rate is high. For special-shaped parts, their processing basically requires auxiliary tooling to complete the processing of the parts. At present, most of the design and manufacturing plans are implemented with one product corresponding to one tooling. This method has obvious advantages and realizes the specialization of tooling fixtures.

[0003] For example, the utility model patent application with application publication number CN115781338A discloses a clamping tool for special-shaped parts and a clamping method for special-shaped parts, including a fixed base plate, a cuttable positioning block, a cuttable positioning shaft and a cam lateral clamping block. The upper end of the fixed base plate is provided with a plurality of rows of threaded holes arranged in an array, and the upper end periphery of the threaded hole is provided with a positioning groove. The cuttable positioning block includes a first cuttable positioning block and a second cuttable positioning block. The cuttable positioning shaft includes a first latch provided at the lower end and a cuttable truncated cone provided at the upper end. The cam lateral clamping block includes a second latch provided at the lower end and a polygonal clamp provided at the upper end. The designer first places the positioning block and the cam lateral clamp according to the characteristics of the processed parts, and then digs out the contoured positioning grooves, surfaces, etc. The production personnel can process the universal tooling according to the placement diagram. The clamping tooling for special-shaped parts can effectively save tooling materials and tooling manufacturing costs, and improve production efficiency. However, the clamping tooling of the special-shaped part needs to pre-dig out the contour positioning groove and surface, and the processing steps are relatively complicated, which is not suitable for the processing and forming of special-shaped shaft parts with symmetrical structures. Utility Model Content

[0004] In order to simplify the processing steps of special-shaped shaft parts with symmetrical structures, improve the positioning accuracy during the processing, improve the processing efficiency, and reduce the workpiece processing scrap rate, the technical solution adopted by the utility model is: a special-shaped shaft fixture tooling, including a positioning shaft assembly and a shaft sleeve, the positioning shaft assembly includes a first positioning shaft and a second positioning shaft connected;

[0005] One end of the second positioning shaft passes through the special-shaped shaft hole and is detachably connected to the shaft sleeve, and a clamping space for clamping the special-shaped shaft is formed between the inner side surface of the first positioning shaft and the inner side surface of the shaft sleeve;

[0006] The outer end faces of the first positioning shaft and the outer end faces of the sleeve are respectively provided with machine tool ejector holes, and the central axes of the two machine tool ejector holes respectively located on the outer end faces of the first positioning shaft and the outer end faces of the sleeve coincide with each other, and the central axis intersects with the central axis of the second positioning shaft at the center of the special-shaped shaft hole and the angle formed is an acute angle, and twice the angle value is complementary to the bending angle value of the special-shaped shaft.

[0007] Based on the above, in order to prevent the special-shaped shaft workpiece from being dislocated and shaking during the processing, a first positioning pin hole is opened along the radial direction of the second positioning axis for cooperating with the part limiting groove at one end of the special-shaped shaft, and a second positioning pin hole is opened along the inner axial direction of the sleeve for cooperating with the part limiting groove at the other end of the special-shaped shaft, and positioning pins are respectively arranged in the first positioning pin hole and the second positioning pin hole.

[0008] That is, the circumferential displacement of the special-shaped shaft can be positioned by using the positioning pin provided on the second positioning shaft to cooperate with the part limiting groove on one end of the special-shaped shaft. The circumferential displacement of the shaft sleeve can be positioned by using the positioning pin provided on the shaft sleeve to cooperate with the part limiting groove on the other end of the special-shaped shaft.

[0009] Based on the above, in order to improve the connection firmness between the second positioning shaft and the sleeve and facilitate installation and positioning, a shaft mounting hole is opened at the inner end of the sleeve, and one end of the second positioning shaft is loosely matched with the shaft mounting hole and connected to the sleeve by a fastening screw.

[0010] During specific processing, the diameter of one end of the second positioning shaft can be reduced, and the aperture value of the shaft mounting hole can be simultaneously designed to be smaller than the diameter value of the second positioning shaft.

[0011] Based on the above, in order to facilitate the processing of the machine tool pinhole, as well as to facilitate the rotation operation and determine the angle between the center axis and the center axis of the second positioning shaft, a process hole is opened along the radial direction of the second positioning shaft, and the process hole passes through the center of the special-shaped shaft hole.

[0012] Based on the above, the diameter of the second positioning shaft is smaller than that of the first positioning shaft. The connecting end of the first positioning shaft and the second positioning shaft forms a positioning step surface for positioning the special-shaped shaft, and a clearance groove is formed at the lower part of the positioning step surface.

[0013] Specifically, in order to facilitate turning when machining the outer circle of the first positioning shaft and to prevent the cutting tool from colliding with the special-shaped shaft simulation sleeve sleeved on the second positioning shaft, a clearance groove is provided at the inner end of the first positioning shaft. During specific machining, the clearance groove is formed by pre-machining a step surface on the contact surface between the first positioning shaft and the second positioning shaft, and then forming the step surface during subsequent machining of the outer circle of the first positioning shaft.

[0014] Specifically, the special-shaped shaft fixture provided by the utility model can be obtained by the following manufacturing method:

[0015] The special-shaped shaft simulation sleeve is processed by referring to the shaft hole diameter and the horizontal projection length of the shaft hole of the special-shaped shaft, and the special-shaped shaft simulation sleeve blank is processed, so that the hollow straight cylinder inner diameter and the blank length of the special-shaped shaft simulation sleeve blank are respectively the same as the shaft hole diameter and the horizontal projection length of the shaft hole of the special-shaped shaft; a simulated positioning hole is processed along the radial direction of the special-shaped shaft simulation sleeve blank, and the simulated positioning hole passes through the hollow straight cylinder center of the special-shaped shaft simulation sleeve blank;

[0016] Pre-machining the positioning shaft assembly to form a stepped shaft with a second positioning shaft at the inner end;

[0017] Processing the shaft sleeve to obtain a shaft sleeve that is detachably connected to one end of the second positioning shaft;

[0018] Assembly: passing one end of the second positioning shaft through the special-shaped shaft simulation sleeve and detachably connecting it with the shaft sleeve to form a temporary assembly tool;

[0019] Processing the ejector hole of the machine tool: horizontally placing the temporary assembly tool, rotating the temporary assembly tool with the central axis of the simulated positioning hole as the horizontal rotation axis, fixing it after being rotated into position, and processing the ejector hole of the machine tool along the same horizontal axis on the outer end surface of the sleeve and the outer end surface of the stepped shaft, respectively. The horizontal axis intersects with the central axis of the second positioning shaft at the center of the hollow straight cylinder of the special-shaped shaft simulation sleeve blank, wherein twice the rotation angle value of the temporary assembly tool is complementary to the bending angle value of the special-shaped shaft;

[0020] The processing positioning shaft assembly is respectively pressed against the machine tool ejector pin holes located on the outer end surface of the sleeve and the outer end surface of the stepped shaft, and the outer end of the stepped shaft is processed into a first positioning shaft, so that the central axis of the first positioning shaft coincides with the central axes of the two machine tool ejector pin holes.

[0021] Among them, the center of the hollow straight cylinder of the special-shaped shaft simulation sleeve blank is at the same position as the center of the special-shaped shaft hole, and the center of the simulated positioning hole is at the same position as the center of the special-shaped shaft hole.

[0022] Specifically, in order to limit the position of the special-shaped shaft simulation sleeve, and to use the positioning pin to position the special-shaped shaft simulation sleeve and the special-shaped shaft to prevent movement during the processing, the step of processing the special-shaped shaft simulation sleeve also includes: referring to the position of the part limiting grooves at both ends of the special-shaped shaft, and processing the contour limiting grooves on the side walls at both ends of the special-shaped shaft simulation sleeve blank in the radial direction;

[0023] The step of pre-machining the positioning shaft assembly also includes: referring to the position of the contoured limiting groove at one end of the special-shaped shaft simulation sleeve blank, machining a first positioning pin hole along the radial direction of the second positioning shaft;

[0024] The step of processing the sleeve also includes: referring to the position of the contoured limiting groove at the other end of the special-shaped shaft simulation sleeve blank, processing a second positioning pin hole along the inner axis direction of the sleeve.

[0025] Specifically, in order to facilitate installation and positioning between the second positioning shaft and the sleeve, the sleeve processing step also includes: processing a shaft installation hole that is clearance-matched with one end of the second positioning shaft and a bolt hole for fixing one end of the second positioning shaft in sequence from the inner side of the sleeve to the outer end along the central axis of the sleeve. The pre-processing positioning shaft assembly step also includes: processing a threaded hole that is used in conjunction with the bolt hole along the central axis of one end of the second positioning shaft.

[0026] The assembling step further includes machining a process hole along the radial direction of the second positioning axis with reference to the position of the simulated positioning hole, wherein the process hole passes through the center of the simulated positioning hole.

[0027] Specifically, for ease of operation, after the process hole is processed, the step of processing the machine tool ejector hole can be to horizontally support the outer circle of the special-shaped shaft simulated sleeve of the temporary assembly tool on the reference platform with a V-shaped iron, calibrate the outer circle of the special-shaped shaft simulated sleeve, determine the height from the center of the process hole to the reference platform, and then rotate the temporary assembly tool with the process hole as the rotation center, and adjust the support height of the temporary assembly tool to ensure that the height from the center of the process hole to the reference platform remains unchanged, and clamp and fix the temporary assembly tool. Then, the machine tool ejector hole is processed along the same horizontal axis at the outer end of the sleeve and the other end of the round bar, respectively, to ensure that the horizontal axis intersects with the central axis of the second positioning axis at the center of the process hole. Among them, twice the rotation angle value of the temporary assembly tool is complementary to the bending angle value at both ends of the special-shaped shaft.

[0028] That is, when the special-shaped shaft is subsequently installed and processed, the center of the special-shaped shaft hole coincides with the center of the process hole.

[0029] Among them, when the machine tool ejector hole is processed along the same horizontal axis between the outer end of the sleeve and the other end of the round bar, in order to realize that the horizontal axis intersects with the central axis of the second positioning shaft at the center of the process hole, a pair of machine tool ejectors can be used in advance to find the center of the outer end surface of the cylindrical sleeve and the center of the outer end surface of the positioning shaft assembly respectively, and the position of the machine tool ejector can be kept unchanged. Then, after the temporary assembly tool is rotated a certain angle, the pair of machine tool ejectors are horizontally moved again. At this time, the points where the pair of machine tool ejectors contact the outer end surface of the cylindrical sleeve and the points where they contact the outer end surface of the positioning shaft assembly are the processing center points of the machine tool ejector hole.

[0030] At the same time, the position of the two machine tool ejector holes can also be found by the benchwork marking method. That is, firstly, draw the diameter through the center point on the outer end face of the cylindrical sleeve and the outer end face of the positioning shaft assembly in the vertical direction, and then, after rotating the temporary assembly tool to a certain angle, draw the corresponding height line on the outer end face of the cylindrical sleeve and the outer end face of the positioning shaft assembly with the height from the center of the process hole to the reference platform as the standard, then the intersection of the height line and the diameter is the machining center point of the two machine tool ejector holes.

[0031] Specifically, the method for machining a special-shaped shaft using the above-mentioned special-shaped shaft fixture tooling comprises the following steps:

[0032] In one assembly process, one end of the second positioning shaft passes through the shaft hole of the special-shaped shaft blank and is detachably connected to the shaft sleeve, so that the special-shaped shaft blank is clamped between the inner side of the first positioning shaft and the inner side of the shaft sleeve, and then the machine tool ejector is used to respectively lift the machine tool ejector holes located on the outer end surface of the first positioning shaft and the outer end surface of the shaft sleeve, and the outer circle of one end of the special-shaped shaft blank is turned;

[0033] The secondary assembly process disassembles the sleeve and the second positioning shaft to remove the special-shaped shaft blank from the second positioning shaft, and then interchanges the left and right ends of the special-shaped shaft blank, repeats the assembly process steps, and turns the outer circle of the other end of the special-shaped shaft blank.

[0034] Based on the above, in order to prevent the special-shaped shaft blank from moving during the processing, before turning the outer circle of one end of the special-shaped shaft blank, the part limiting groove at one end of the special-shaped shaft blank corresponds to the first positioning pin hole on the second positioning shaft, and the part limiting groove at the other end of the special-shaped shaft blank corresponds to the second positioning pin hole on the inner side of the sleeve, and then the positioning pins are respectively installed in the first positioning pin hole and the second positioning pin hole.

[0035] The specific structure of the special-shaped shaft in the utility model includes a left oblique stepped shaft, a right oblique stepped shaft and a middle partition. The left oblique stepped shaft and the right oblique stepped shaft are respectively connected to the two sides of the middle partition. The left oblique stepped shaft, the right oblique stepped shaft and the middle partition are provided with a transversely penetrating shaft hole. The middle partition is a quasi-circular plate that is thick on the top and thin on the bottom, and the lower part of the middle partition forms a straight edge. The bending angle at both ends of the special-shaped shaft refers to the angle between the axis of the left oblique stepped shaft and the axis of the right oblique stepped shaft.

[0036] Specifically, the center of the axial hole of the special-shaped shaft is located at the center point on the central axis of the axial hole of the special-shaped shaft. The center of the hollow straight cylinder of the special-shaped shaft simulation sleeve blank is located at the center point on the central axis of the hollow straight cylinder of the special-shaped shaft simulation sleeve blank.

[0037] The utility model has substantial features and progress compared with the prior art. Specifically, the special-shaped shaft fixture provided by the utility model is designed into a positioning shaft assembly and a sleeve connected by fastening screws according to the characteristics of the special-shaped shaft part having a symmetrical structure and the left and right inclined stepped shafts, so as to facilitate the clamping and U-turn forming of the special-shaped shaft part. At the same time, according to the characteristics that the special-shaped shaft part has an axial hole inside and the center line of the axial hole deviates from the center of the end face of the special-shaped shaft part, the positioning shaft assembly is specially designed into a three-section structure, and a machine tool ejector hole is opened at one end of the first section to ensure that the inclined stepped shaft of the special-shaped shaft part coincides with the axis of the machine tool machining center during the processing, and the table between the second section and the first section is used to form a positioning step surface for positioning the special-shaped shaft part. At the same time, the diameter of one end of the second positioning shaft is reduced to form a third section, and the third section is inserted into the sleeve to effectively position the other end of the special-shaped shaft part.

[0038] At the same time, a machine tool pin hole is opened on the positioning shaft assembly to ensure the processing position of the special-shaped shaft parts, and a simulated workpiece is used in advance to assist in the processing of the machine tool pin holes on the positioning shaft and the sleeve, thereby improving the processing accuracy and consistency of the special-shaped shaft parts.

[0039] Therefore, the special-shaped shaft fixture simplifies the processing steps of the special-shaped shaft parts with a symmetrical structure, improves the positioning accuracy during the processing, improves the processing efficiency, and reduces the scrap rate of the workpiece processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 , Figure 2 and Figure 3 It is a schematic diagram of the structure of special-shaped shaft parts.

[0041] Figure 4 and Figure 5 The utility model is a schematic diagram of the assembly structure of a special-shaped shaft fixture and a special-shaped shaft part.

[0042] Figure 6 The utility model provides a schematic diagram of the cross-sectional structure of a special-shaped shaft fixture and a special-shaped shaft part assembly.

[0043] Figure 7 The utility model is a schematic diagram of the overall structure of the positioning shaft assembly in the special-shaped shaft fixture.

[0044] Figure 8 The utility model is a schematic diagram of the cross-sectional structure of a positioning shaft component in a special-shaped shaft fixture provided by the utility model.

[0045] Fig. 9 The utility model is a schematic diagram of the assembly structure of a special-shaped shaft fixture and a special-shaped shaft simulation sleeve.

[0046] Fig.10The utility model is a schematic diagram of the blank structure of the positioning shaft component in the special-shaped shaft fixture tooling.

[0047] Fig.11 and Fig.12 The utility model provides a schematic diagram of the assembly structure of a positioning shaft component blank and a special-shaped shaft simulation sleeve in a special-shaped shaft fixture tooling.

[0048] Fig.13 The utility model is a schematic diagram of the assembly structure of the positioning shaft component and the special-shaped shaft simulation sleeve in the special-shaped shaft fixture tooling provided by the utility model.

[0049] In the figure: 1. middle partition; 2. left inclined stepped shaft; 3. right inclined stepped shaft; 4. shaft hole; 5. part limit groove; 6. edge; 7. first positioning shaft; 8. first machine tool ejector hole; 9. clearance groove; 10. second positioning shaft; 11. process hole; 12. first positioning pin hole; 13. positioning step surface; 14. second machine tool ejector hole; 15. shaft sleeve; 16. fastening screw; 17. second positioning pin hole; 18. shaft mounting hole; 19. screw assembly hole; 20. threaded hole; 21. special-shaped shaft simulation sleeve; 22. simulation positioning hole; 23. positioning pin. DETAILED DESCRIPTION

[0050] The technical solution of the utility model is further described in detail below through specific implementation methods.

[0051] Example 1

[0052] This embodiment provides a special-shaped shaft fixture, such as Figure 6 , Figure 7 , Figure 8 , Fig. 9 As shown, it includes a positioning shaft assembly and a shaft sleeve 15, and the positioning shaft assembly includes a first positioning shaft 7 and a second positioning shaft 10 connected to each other.

[0053] One end of the second positioning shaft 10 passes through the shaft hole 4 of the special-shaped shaft and is detachably connected to the shaft sleeve 15. A clamping space for clamping the special-shaped shaft is formed between the inner side surface of the first positioning shaft 7 and the inner side surface of the shaft sleeve 15.

[0054] The outer end surface of the first positioning shaft 7 and the outer end surface of the sleeve 15 are respectively provided with a machine tool ejector hole. The central axes of the two machine tool ejector holes respectively located on the outer end surface of the first positioning shaft and the outer end surface of the sleeve coincide with each other. The central axis intersects with the central axis of the second positioning shaft 10 at the center of the special-shaped shaft hole and the angle formed is an acute angle, and twice the angle value is complementary to the bending angle value of the special-shaped shaft.

[0055] For the convenience of distinction, the two machine tool ejector holes are respectively recorded as the first machine tool ejector hole 8 and the second machine tool ejector hole 14. The first positioning shaft and the second positioning shaft form a positioning step surface 13.

[0056] Specifically, Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, the angle between the central axis of the two machine tool ejector holes and the axis of the second positioning shaft is recorded as angle α. The bending angle at both ends of the special-shaped shaft is recorded as angle β. Among them, the bending angle at both ends of the special-shaped shaft refers to the angle between the axis of the left inclined stepped shaft 2 and the axis of the right inclined stepped shaft 3 of the special-shaped shaft.

[0057] Specifically, the structure of the special-shaped shaft parts processed and formed in this embodiment is as follows: Figure 1 , Figure 2 and Figure 3 As shown, it specifically includes a left oblique stepped shaft 2, a right oblique stepped shaft 3 and a middle partition 1. The left oblique stepped shaft 2 and the right oblique stepped shaft 3 are respectively connected to the two sides of the middle partition 3. A transversely penetrating shaft hole 4 is provided inside the left oblique stepped shaft 2, the right oblique stepped shaft 3 and the middle partition 1. The middle partition 1 is a quasi-circular plate that is thick on the top and thin on the bottom, and the lower part of the middle partition 1 forms a straight edge 6. Parts limiting grooves 5 are provided at both ends of the left oblique stepped shaft 2 and the right oblique stepped shaft 3.

[0058] Example 2

[0059] This embodiment provides a special-shaped shaft fixture, which is different from the embodiment 1 mainly in that: Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 and Fig.11 In order to prevent the special-shaped shaft workpiece from being dislocated and shaking during the processing, a first positioning pin hole 12 for cooperating with the part limiting groove 5 at one end of the special-shaped shaft is opened along the radial direction of the second positioning shaft 10.

[0060] A second positioning pin hole 17 for cooperating with the part limiting groove 5 at the other end of the special-shaped shaft is provided along the inner axial direction of the shaft sleeve 15. Positioning pins 23 are respectively provided in the first positioning pin hole 12 and the second positioning pin hole 17.

[0061] That is, the circumferential displacement of the special-shaped shaft can be positioned by using the positioning pin provided on the second positioning shaft to cooperate with the part limiting groove on one end of the special-shaped shaft. The circumferential displacement of the shaft sleeve can be positioned by using the positioning pin provided on the shaft sleeve to cooperate with the part limiting groove on the other end of the special-shaped shaft.

[0062] Example 3

[0063] This embodiment provides a special-shaped shaft fixture, which is different from the embodiment 1 mainly in that: Figure 6 , Figure 8 and Fig. 9 As shown, in order to facilitate the installation and positioning between the second positioning shaft 10 and the sleeve 15, the inner end of the sleeve 15 is provided with a shaft mounting hole 18 and a screw assembly hole 19, and the outer end of the second positioning shaft 10 is provided with a threaded hole 20. One end of the second positioning shaft 10 is inserted into the shaft mounting hole 18 and connected to the sleeve 15 by a fastening screw 16.

[0064] Example 4

[0065] This embodiment provides a special-shaped shaft fixture, which is mainly different from the first embodiment in that, in order to facilitate the processing of the machine tool ejector hole, the rotation operation and the determination of the angle between the central axis and the central axis of the second positioning shaft, in this embodiment, a process hole 11 is opened along the radial direction of the second positioning shaft 10, and the process hole 11 passes through the center of the shaft hole 4 of the special-shaped shaft. The process hole is subsequently processed according to the simulated positioning hole 22 on the special-shaped shaft simulation sleeve 21 of the second positioning shaft.

[0066] Specifically, in order to facilitate turning when machining the outer circle of the first positioning shaft and to prevent the cutting tool from colliding with the special-shaped shaft simulation sleeve sleeved on the second positioning shaft, a clearance groove 9 is provided at the inner end of the first positioning shaft 7. During specific machining, the clearance groove 9 is formed by pre-machining a step surface on the contact surface between the first positioning shaft and the second positioning shaft, and then forming the step surface during the subsequent machining of the outer circle of the first positioning shaft.

[0067] Specifically, the special-shaped shaft fixture provided by the present invention can be manufactured by the following steps: Fig.10 , Fig.11 , Fig.12 and Fig.13 As shown:

[0068] Processing a special-shaped shaft simulation sleeve provides a hollow bar material, and referring to the axial hole diameter and horizontal projection length of the axial hole of the special-shaped shaft, processes a special-shaped shaft simulation sleeve blank, so that the hollow straight cylinder inner diameter and blank length of the special-shaped shaft simulation sleeve blank are respectively the same as the axial hole diameter and horizontal projection length of the axial hole of the special-shaped shaft; a simulation positioning hole is processed along the radial direction of the special-shaped shaft simulation sleeve blank, and the simulation positioning hole passes through the center of the central axis of the special-shaped shaft simulation sleeve blank;

[0069] Pre-machining the positioning shaft assembly to form a stepped shaft with a second positioning shaft at the inner end;

[0070] Processing the shaft sleeve to obtain a shaft sleeve that is detachably connected to one end of the second positioning shaft;

[0071] Assembly: passing one end of the second positioning shaft through the special-shaped shaft simulation sleeve and detachably connecting it with the shaft sleeve to form a temporary assembly tool;

[0072] Processing the ejector hole of the machine tool: horizontally placing the temporary assembly tool, rotating the temporary assembly tool with the central axis of the simulated positioning hole as the horizontal rotation axis, fixing it after being rotated into position, and processing the ejector hole of the machine tool along the same horizontal axis on the outer end surface of the sleeve and the outer end surface of the stepped shaft, respectively. The horizontal axis intersects with the central axis of the second positioning shaft at the center of the hollow straight cylinder of the special-shaped shaft simulation sleeve blank, wherein twice the rotation angle value of the temporary assembly tool is complementary to the bending angle value of the special-shaped shaft;

[0073] The processing positioning shaft assembly is respectively pressed against the machine tool ejector pin holes located on the outer end surface of the sleeve and the outer end surface of the stepped shaft, and the outer end of the stepped shaft is processed into a first positioning shaft, so that the central axis of the first positioning shaft coincides with the central axes of the two machine tool ejector pin holes.

[0074] Among them, the center of the hollow straight cylinder of the special-shaped shaft simulation sleeve blank is at the same position as the center of the special-shaped shaft hole, and the center of the simulated positioning hole is at the same position as the center of the special-shaped shaft hole.

[0075] Specifically, in this embodiment, when the machine tool ejector hole is machined along the same horizontal axis at the outer end of the sleeve and the other end of the round bar, in order to achieve the intersection of the horizontal axis and the central axis of the second positioning shaft at the center of the process hole, a pair of machine tool ejectors can be used in advance to find the center of the outer end surface of the cylindrical sleeve and the center of the outer end surface of the positioning shaft assembly respectively, and the position of the machine tool ejectors can be kept unchanged. Then, after the temporary assembly tool is rotated a certain angle, the pair of machine tool ejectors are moved horizontally again. At this time, the points where the pair of machine tool ejectors contact the outer end surface of the cylindrical sleeve and the points where they contact the outer end surface of the positioning shaft assembly are the machining center points of the machine tool ejector hole.

[0076] Meanwhile, in other embodiments, the position of the two machine tool ejector holes can also be found by the benchwork marking method. That is, firstly, the diameter through the center point is drawn on the outer end surface of the cylindrical sleeve and the outer end surface of the positioning shaft assembly along the vertical direction, and then, after the temporary assembly tool is rotated by a certain angle, the corresponding height lines are drawn on the outer end surface of the cylindrical sleeve and the outer end surface of the positioning shaft assembly respectively, with the height from the center of the process hole to the reference platform as the standard, and then the intersection between the height line and the diameter is the machining center point of the two machine tool ejector holes.

[0077] Among them, in order to be able to limit the special-shaped shaft simulation sleeve, and to use the positioning pin to position the special-shaped shaft simulation sleeve and the special-shaped shaft to prevent movement during the processing, the step of processing the special-shaped shaft simulation sleeve preferably includes referring to the position of the part limiting groove 5 at both ends of the special-shaped shaft, and radially processing the contour-matching limiting grooves on the side walls at both ends of the special-shaped shaft simulation sleeve blank.

[0078] The step of pre-machining the positioning shaft assembly also includes machining a first positioning pin hole along the radial direction of the second positioning shaft with reference to the position of the contoured limiting groove at one end of the special-shaped shaft simulation sleeve blank.

[0079] The step of machining the sleeve also includes machining a second positioning pin hole along the inner axis direction of the sleeve with reference to the position of the contoured limiting groove at the other end of the special-shaped shaft simulation sleeve blank.

[0080] Specifically, in order to facilitate installation and positioning between the second positioning shaft and the shaft sleeve, the shaft sleeve processing step further includes processing a shaft mounting hole along the inner central axis direction of the shaft sleeve.

[0081] The step of pre-machining the positioning shaft assembly also includes machining a threaded hole 20 corresponding to the shaft mounting hole along the central axis direction of the second positioning shaft.

[0082] The assembling step further includes machining a process hole along the radial direction of the second positioning axis with reference to the position of the simulated positioning hole, wherein the process hole passes through the center of the simulated positioning hole.

[0083] Specifically, for ease of operation, after the process hole is processed, the step of processing the machine tool ejector hole can be to horizontally support the outer circle of the special-shaped shaft simulated sleeve of the temporary assembly tool on the reference platform with a V-shaped iron, calibrate the outer circle of the special-shaped shaft simulated sleeve, determine the height from the center of the process hole to the reference platform, and then rotate the temporary assembly tool with the process hole as the rotation center, and adjust the support height of the temporary assembly tool to ensure that the height from the center of the process hole to the reference platform remains unchanged, and clamp and fix the temporary assembly tool. Then, the machine tool ejector hole is processed along the same horizontal axis at the outer end of the sleeve and the other end of the round bar, respectively, to ensure that the horizontal axis intersects with the central axis of the second positioning axis at the center of the process hole. Among them, twice the rotation angle value of the temporary assembly tool is complementary to the bending angle value at both ends of the special-shaped shaft.

[0084] That is, when the special-shaped shaft is subsequently installed and processed, the center of the special-shaped shaft hole coincides with the center of the process hole.

[0085] Specifically, a method for machining a special-shaped shaft using the special-shaped shaft fixture provided in any one of embodiments 1 to 4 is as follows: Figure 4 , Figure 5 and Figure 6 As shown, the following steps are included:

[0086] In one assembly process, one end of the second positioning shaft passes through the shaft hole of the special-shaped shaft blank and is detachably connected to the shaft sleeve, so that the special-shaped shaft blank is clamped between the inner side of the first positioning shaft and the inner side of the shaft sleeve, and then the machine tool ejector is used to respectively lift the machine tool ejector holes located on the outer end surface of the first positioning shaft and the outer end surface of the shaft sleeve, and the outer circle of one end of the special-shaped shaft blank is turned;

[0087] The secondary assembly process disassembles the sleeve and the second positioning shaft to remove the special-shaped shaft blank from the second positioning shaft, and then interchanges the left and right ends of the special-shaped shaft blank, repeats the assembly process steps, and turns the outer circle of the other end of the special-shaped shaft blank.

[0088] Among them, in order to prevent the special-shaped shaft blank from moving during the processing, the one-time assembly processing step also includes, before turning the outer circle of one end of the special-shaped shaft blank, corresponding the part limiting groove at one end of the special-shaped shaft to the first positioning pin hole on the second positioning shaft, and corresponding the part limiting groove at the other end of the special-shaped shaft to the second positioning pin hole on the inner side of the sleeve, and then installing the positioning pins in the first positioning pin hole and the second positioning pin hole respectively.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A special-shaped shaft fixture, characterized in that: It includes a positioning shaft assembly and a shaft sleeve, wherein the positioning shaft assembly includes a first positioning shaft and a second positioning shaft connected to each other; One end of the second positioning shaft passes through the special-shaped shaft hole and is detachably connected to the shaft sleeve, and a clamping space for clamping the special-shaped shaft is formed between the inner side surface of the first positioning shaft and the inner side surface of the shaft sleeve; The outer end faces of the first positioning shaft and the outer end faces of the sleeve are respectively provided with machine tool ejector holes, and the central axes of the two machine tool ejector holes respectively located on the outer end faces of the first positioning shaft and the outer end faces of the sleeve coincide with each other, and the central axis intersects with the central axis of the second positioning shaft at the center of the special-shaped shaft hole and the angle formed is an acute angle, and twice the angle value is complementary to the bending angle value of the special-shaped shaft.

2. The special-shaped shaft fixture according to claim 1, characterized in that: A first positioning pin hole is opened along the radial direction of the second positioning shaft for cooperating with the part limiting groove at one end of the special-shaped shaft, and a second positioning pin hole is opened along the inner axial direction of the sleeve for cooperating with the part limiting groove at the other end of the special-shaped shaft.

3. The special-shaped shaft fixture according to claim 1, characterized in that: The inner end of the shaft sleeve is provided with a shaft mounting hole, and one end of the second positioning shaft is loosely matched with the shaft mounting hole and is connected to the shaft sleeve via a fastening screw.

4. The special-shaped shaft fixture according to claim 1, 2 or 3, characterized in that: A process hole is opened along the radial direction of the second positioning shaft, and the process hole passes through the center of the axial hole of the special-shaped shaft.

5. The special-shaped shaft fixture according to claim 4, characterized in that: The diameter of the second positioning shaft is smaller than the diameter of the first positioning shaft.

6. The special-shaped shaft fixture according to claim 5, characterized in that: The connecting end of the first positioning shaft and the second positioning shaft forms a positioning step surface for positioning the special-shaped shaft, and a clearance groove is formed at the lower part of the positioning step surface.

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