CN110712127A - Composite grinding clamp and rotating shaft machining method - Google Patents
Composite grinding clamp and rotating shaft machining method Download PDFInfo
- Publication number
- CN110712127A CN110712127A CN201910889969.1A CN201910889969A CN110712127A CN 110712127 A CN110712127 A CN 110712127A CN 201910889969 A CN201910889969 A CN 201910889969A CN 110712127 A CN110712127 A CN 110712127A
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- rotating shaft
- grinding
- cylinder
- clamping
- locking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
Abstract
The invention discloses a composite grinding fixture and a rotating shaft machining method, which comprise a connecting seat assembly detachably connected with grinding equipment, wherein the connecting seat assembly is provided with a positioning surface which is attached to a supporting end surface of a large end of a rotating shaft so as to axially position the rotating shaft, and the connecting seat assembly is sleeved with an elastic clamping cylinder which is used for radially drawing under external force extrusion so as to clamp a positioning circular surface of the large end of the rotating shaft. The locking cylinder group is sleeved outside the elastic clamping cylinder and is in conical surface fit with the locking cylinder group, the locking cylinder group is in threaded connection with the outer circular surface of the connecting seat assembly, so that the locking cylinder group applies radial acting force to the elastic clamping cylinder in the process of screwing the locking cylinder group, and the elastic clamping cylinder is folded inwards along the radial direction to clamp the positioning circular surface of the rotating shaft. The composite grinding clamp further comprises a pressing component which is used for being arranged in the shaft hole at the large end of the rotating shaft, and the pressing component is used for being connected with the connecting seat assembly and axially clamping the flange of the inner hole so as to press the rotating shaft and the positioning surface.
Description
Technical Field
The invention relates to the field of shaft part machining, in particular to a composite grinding clamp. In addition, the invention also relates to a method for processing the rotating shaft after the rotating shaft is clamped by the composite grinding clamp.
Background
The precision requirement of a certain precision rotating shaft part of a small and medium-sized aircraft engine is extremely high, as shown in figure 1 of the accompanying drawings, the size precision and the technical requirement of a matching surface directly influence the vibration and the performance of the engine, when the part is machined, multiple parts of an inner hole, an outer circle and an end face of the part are required to be respectively ground, and the jumping degree between the machined surfaces is required to be within 0.003 mm. Because the design standard is A, B two inner holes, the size of the inner hole is small, and the alignment difficulty is high; as shown in fig. 1 of the accompanying drawings, positions marked with dimensions on parts are required to be ground, the positions to be machined are multiple, the positions capable of being clamped are too small and limited by machining equipment and clamping fixtures, the existing machining method is divided into multiple steps, namely multiple sets of fixtures are matched with multiple steps for machining, the machining steps are multiple, the machining efficiency is low, the labor intensity of workers is high, clamping and positioning references are changed continuously, the precision of machined parts is low, most of the parts need to be repaired continuously, and even scrapped.
Disclosure of Invention
The invention provides a composite grinding clamp and a rotating shaft machining method, and aims to solve the technical problems of various machining steps, low machining efficiency, high labor intensity of workers and low machining precision of a rotating shaft in the process of clamping the rotating shaft by using the conventional clamp.
The technical scheme adopted by the invention is as follows:
a composite grinding fixture is used for clamping and positioning a rotating shaft to be machined, an inner hole flange is arranged in a shaft hole at the large end of the rotating shaft, the outer side wall surface of the large end of the rotating shaft is a positioning circular surface, the composite grinding fixture comprises a connecting seat assembly which is detachably connected with grinding machining equipment, a positioning surface which is used for being attached to the abutting end surface of the large end of the rotating shaft so as to axially position the rotating shaft is arranged on the connecting seat assembly, an elastic clamping cylinder is sleeved on the connecting seat assembly, and the elastic clamping cylinder is used for being folded in along the radial direction under the extrusion of external force so as to clamp the positioning circular surface of the; a locking cylinder group is sleeved outside the elastic clamping cylinder, the elastic clamping cylinder and the locking cylinder group are in conical surface fit, the locking cylinder group is in threaded connection with the outer circular surface of the connecting seat assembly, so that the locking cylinder group applies radial acting force to the elastic clamping cylinder in the process of screwing the locking cylinder group, and the elastic clamping cylinder is folded inwards along the radial direction to clamp the positioning circular surface of the rotating shaft; the composite grinding clamp further comprises a pressing component which is used for being arranged in the shaft hole at the large end of the rotating shaft, and the pressing component is used for being connected with the connecting seat assembly and axially clamping the flange of the inner hole so as to press the rotating shaft and the positioning surface.
Furthermore, the elastic clamping cylinder is in a hollow cylinder shape with two communicated ends, and is positioned between the limiting step surface of the connecting seat assembly and the outer circular flange at the large end of the rotating shaft; a conical outer conical surface is arranged at the furling end of the elastic clamping cylinder close to the outer circular flange, and the large end of the outer conical surface is close to the limiting step surface; the folding end of the elastic clamping cylinder is provided with a plurality of folding notch grooves which are arranged at intervals along the circumferential direction, each folding notch groove extends from the end surface of the folding end to the direction of the limit end opposite to the folding end, and each folding notch groove penetrates through the wall body of the elastic clamping cylinder.
Further, the furling notch groove comprises a linear section and a waist-shaped section, wherein the linear section is connected with the linear section along the axial direction and is waist-shaped; the spacing end of an elastic clamping barrel is provided with a plurality of anti-rotation notch grooves which are arranged at intervals along the circumferential direction, each anti-rotation notch groove extends from the end surface of the spacing end to the furling end, each anti-rotation notch groove penetrates through the side wall of the elastic clamping barrel, and the anti-rotation notch grooves are used for inserting anti-rotation rods connected to the connecting seat assembly to prevent the elastic clamping barrel from rotating under the action of the locking barrel set.
Furthermore, the locking cylinder group comprises a clamping cylinder sleeved outside the elastic clamping cylinder and a locking cylinder sleeved on the connecting seat assembly, and the clamping cylinder and the locking cylinder are both in a hollow cylinder shape with two communicated ends; the clamping cylinder comprises a clamping end and a stress end opposite to the clamping end, an inner conical surface matched with the outer conical surface on the folding end is arranged in a shaft hole of the clamping end, and an outer convex annular stress flange is arranged on the outer circle of the stress end; the locking barrel comprises a force application end and a locking end opposite to the force application end, a force application flange which protrudes towards the center and is annular is arranged in a shaft hole of the force application end, the force application flange is used for being propped against the force application flange along the axial direction to enable the locking barrel to be connected with the clamping barrel, and an internal thread matched with an external thread on the excircle of the connecting seat assembly is further arranged in the shaft hole of the locking end, so that the locking barrel pulls the clamping barrel to move towards the limiting end of the elastic clamping barrel along the axial direction in the process of screwing the locking barrel, and further the clamping barrel applies a clamping force which is inward along the radial direction to the elastic clamping barrel.
Furthermore, a plurality of limit stop pins are connected to the connecting seat assembly; a plurality of guide grooves which are matched with the limiting stop pins are arranged in the shaft hole of the stress end of the clamping barrel, each guide groove extends from the stress end to the clamping end, and the guide grooves are used for the corresponding limiting stop pins to be inserted so as to guide the sliding of the clamping barrel and prevent the clamping barrel from rotating under the action of the locking barrel; a plurality of avoiding notch grooves are formed in the clamping end of the clamping barrel clamp at intervals along the circumferential direction, each avoiding notch groove extends from the end face of the clamping end to the stressed end, each avoiding notch groove penetrates through the wall body of the side wall of the clamping barrel, and each avoiding notch groove is used for avoiding a measuring tool for measuring the wall thickness of the clamping end; the locking section of thick bamboo group still includes the locking round pin, and the locking round pin is arranged in the installation pinhole that inserts a clamping section of thick bamboo when atress flange and application of force flange top tightly in order to detect whether atress flange and application of force flange top tightly, and the locking round pin still is used for supporting the terminal surface of a locking section of thick bamboo application of force end in order to prevent that a locking section of thick bamboo gyration is loosened.
Furthermore, the compression assembly comprises a clamping plate, a plurality of groups of hook-shaped bolt pieces, a pull rod shaft and a locking nut; the clamping plate is arranged in the shaft hole at the large end of the rotating shaft and is used for abutting against the first ring surface of the inner hole flange; the hook-shaped bolt pieces are used for abutting against the second annular surface of the inner hole flange so as to be matched with the clamping plate to clamp the inner hole flange oppositely; one end of the pull rod shaft is connected with the connecting seat assembly, the clamping plate is axially penetrated through the other end of the pull rod shaft, and a locking nut is in threaded connection with the excircle of the shaft body after the clamping plate is penetrated through, so that the rotating shaft and the positioning surface of the connecting seat assembly are tightly pressed in the process of screwing the locking nut.
Furthermore, the connecting seat assembly comprises a connecting base group detachably connected with the grinding processing equipment, a positioning cylinder seat used for positioning the rotating shaft and an installation cylinder seat used for installing the locking cylinder group; after the connecting base group part is inserted into a machine tool spindle of the grinding processing equipment, the exposed part of the connecting base group part is detachably connected with a connecting flange disc at the end part of the machine tool spindle; the positioning cylinder seat is in a hollow cylinder shape with two communicated ends, the elastic clamping cylinder is sleeved outside the positioning cylinder seat, the first end of the positioning cylinder seat abuts against the connecting base group and is detachably connected with the connecting base group through a first connecting piece, and the end face of the second end of the positioning cylinder seat forms a positioning surface; the installation barrel seat is hollow tube-shape and suit of both ends intercommunication outside the elastic clamping barrel, and the first end top of installation barrel seat is supported and is connected the base group and through second connecting piece and the detachable connection of connection base group, is equipped with the external screw thread with locking section of thick bamboo group threaded connection on the excircle of the first end of installation barrel seat, is equipped with the installation through-hole that is used for installing spacing backing pin perpendicularly on the excircle of installation barrel seat second end.
Furthermore, the connecting base group comprises a flange plate detachably connected with the machine tool spindle, a positioning bushing and a connecting base; the flange plate comprises a connecting shaft inserted into a shaft hole of the machine tool spindle and a connecting disc connected with the connecting shaft and used for being connected with a connecting flange plate at the end part of the machine tool spindle; the positioning bush is connected with the connecting base, and two ends of the positioning bush are respectively inserted into the end face of the second end of the flange plate and the end face of the first end of the connecting base; the connecting base is detachably connected with the connecting disc of the flange plate, the second end face of the connecting base is connected with a limiting step face, and the positioning barrel seat and the mounting barrel seat are detachably connected with the connecting base respectively.
According to another aspect of the present invention, there is also provided a rotating shaft machining method including the steps of: clamping the composite grinding clamp to grinding equipment; clamping and fixing a rotating shaft to be processed on a composite grinding clamp; processing all the excircle to be processed on the rotating shaft and the small end face of the rotating shaft; processing an inner hole A to be processed in the rotating shaft; and machining an inner hole B to be machined in the rotating shaft.
Further, the machining of all the to-be-machined excircles on the rotating shaft and the small end face of the rotating shaft comprises the following steps: selecting the type, specification and abrasive of the grinding wheel, and setting the grinding speed and the cooling condition of the grinding wheel during grinding; grinding all the to-be-processed excircles on the rotating shaft and the small end face of the rotating shaft according to the procedures of coarse grinding, semi-fine grinding and fine grinding; the method for machining the inner hole A to be machined in the rotating shaft specifically comprises the following steps: selecting the type, specification and abrasive of the grinding wheel, and setting the grinding speed and the cooling condition of the grinding wheel during grinding; grinding the inner hole A according to the procedures of coarse grinding, semi-fine grinding and fine grinding; the method for machining the inner hole B to be machined in the rotating shaft specifically comprises the following steps: selecting the type, specification and abrasive of the grinding wheel, and setting the grinding speed and the cooling condition of the grinding wheel during grinding; and grinding the inner hole B according to the procedures of coarse grinding, semi-fine grinding and fine grinding.
The invention has the following beneficial effects:
the composite grinding fixture disclosed by the invention has the advantages that the surfaces and the bosses which are not required to be ground in grinding equipment on the rotating shaft are adopted for clamping, positioning and fixing the rotating shaft, so that the parts of the outer circle, the inner hole and the small end face of the rotating shaft which need to be machined can be machined by one-time clamping, the number of machining operation steps is small, the machining efficiency is high, and the labor intensity of workers is low; the clamping and positioning reference does not need to be changed in the whole machining process, so that the machined rotating shaft has high precision and high qualification rate, does not need to be repaired, and does not cause machining scrap of the rotating shaft;
in the method for processing the rotating shaft, the rotating shaft to be processed is clamped and positioned by adopting the composite grinding clamp of any one of the grinding tools, so that the processing of the part to be processed on the excircle, the inner hole and the small end surface of the rotating shaft can be realized by one-time clamping, the processing steps are few, the processing efficiency is high, and the labor intensity of workers is low; and because the clamping and positioning reference does not need to be changed in the whole machining process, the machined rotating shaft has high precision and high qualification rate, does not need to be repaired, and does not cause the machining scrapping of the rotating shaft.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a cross-sectional structural view of a rotating shaft to be machined;
FIG. 2 is a schematic view of a space structure of the composite grinding fixture for clamping a rotating shaft according to the preferred embodiment of the invention;
FIG. 3 is a cross-sectional front view schematic of FIG. 2;
FIG. 4 is a schematic view of the construction of the resilient cartridge of FIG. 3;
FIG. 5 is a schematic view of the clamping cylinder of FIG. 3;
FIG. 6 is a schematic view of the partial cross-sectional structure of FIG. 2;
FIG. 7 is a schematic structural view of the locking barrel of FIG. 3;
FIG. 8 is a schematic view of the positioning hub of FIG. 3;
FIG. 9 is a schematic view of the structure of the mounting cartridge of FIG. 3;
FIG. 10 is a schematic view of the flange of FIG. 3;
fig. 11 is a schematic structural view of the connection base in fig. 3.
Description of the figures
10. A rotating shaft; 101. an outer circular flange; 102. an inner bore flange; 1021. a first annulus; 1022. a second annulus; 103. a bearing end surface; 104. positioning the round surface; 20. a connecting seat assembly; 201. positioning the surface; 202. a limiting step surface; 21. a positioning cylinder seat; 210. a weight reduction window; 22. mounting a barrel seat; 220. mounting a through hole; 23. a flange plate; 24. positioning the bushing; 25. connecting a base; 30. an elastic clip cylinder; 301. an outer conical surface; 302. drawing the notch groove; 303. an anti-rotation notch groove; 31. closing the end; 32. a limiting end; 40. locking the cylinder group; 401. an inner conical surface; 402. a stressed flange; 403. a force application flange; 404. a guide groove; 405. avoiding the notch groove; 406. mounting pin holes; 407. a jack; 41. a clamping cylinder; 411. a clamping end; 412. a force-bearing end; 42. a locking cylinder; 421. a force application end; 422. a locking end; 43. a locking pin; 50. a compression assembly; 51. a splint; 52. a hook bolt member; 53. a pull rod shaft; 54. locking the nut; 55. a stop pin; 60. a rotation prevention bar; 70. and a limit stop pin.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
Referring to fig. 1 to 3, a preferred embodiment of the present invention provides a composite grinding jig for clamping and positioning a rotating shaft 10 to be processed, wherein an inner hole flange 102 is disposed in a shaft hole of a large end of the rotating shaft 10, an outer side wall surface of the large end of the rotating shaft 10 is a positioning circular surface 104, the composite grinding jig includes a connecting seat assembly 20 detachably connected to a grinding processing device, the connecting seat assembly 20 is provided with a positioning surface 201 for being attached to a support end surface 103 of the large end of the rotating shaft 10 to axially position the rotating shaft 10, the connecting seat assembly 20 is sleeved with an elastic clamping cylinder 30, and the elastic clamping cylinder 30 is used for being radially drawn in under external force extrusion to clamp the positioning circular surface 104 of the large end of the rotating shaft 10. The elastic clamping cylinder 30 is externally sleeved with a locking cylinder group 40, the elastic clamping cylinder 30 is in conical surface fit with the locking cylinder group 40, the locking cylinder group 40 is in threaded connection with the outer circular surface of the connecting seat assembly 20, so that the locking cylinder group 40 applies radial acting force to the elastic clamping cylinder 30 in the process of screwing the locking cylinder group 40, and the elastic clamping cylinder 30 is folded inwards in the radial direction to clamp the positioning circular surface 104 of the rotating shaft 10. The composite grinding fixture further comprises a pressing assembly 50 for being mounted in the large-end shaft hole of the rotating shaft 10, wherein the pressing assembly 50 is used for being connected with the connecting base assembly 20 and axially clamping the inner hole flange 102 so as to press the rotating shaft 10 and the positioning surface 201.
In the invention, as can be seen from fig. 1 of the drawings, the inner hole flange 102, the support end surface 103 and the positioning circular surface 104 on the rotating shaft 10 do not need to be ground in a grinding device, so that the composite grinding fixture of the invention uses the inner hole flange 102, the support end surface 103 and the positioning circular surface 104 to clamp and position the rotating shaft 10, that is, the rotating shaft 10 is positioned and supported in the axial direction by the matching of the support end surface 103 and the positioning surface 201 on the connecting seat assembly 20, the elastic clamping cylinder 30 clamps the positioning circular surface 104 of the rotating shaft 10 by the matching action of the locking cylinder group 40 and the elastic clamping cylinder 30, that is, the large end of the rotating shaft 10 is clamped, and the rotating shaft 10 and the positioning surface 201 are pressed by the pressing component 50, that is, the rotating shaft 10 and the connecting seat assembly 20 are pressed in the axial direction, thereby clamping, positioning and fixing the rotating shaft 10 on the composite grinding fixture. The composite grinding fixture disclosed by the invention is used for clamping, positioning and fixing the rotating shaft 10, and adopts the surface and the boss which are not required to be ground in grinding equipment on the rotating shaft 10, so that the machining of the part needing to be machined on the outer circle, the inner hole and the small end surface of the rotating shaft 10 can be realized by one-time clamping, the operation steps in machining are less, the machining efficiency is high, and the labor intensity of workers is low; the clamping and positioning reference does not need to be changed in the whole machining process, so that the machined rotating shaft has high precision and high qualification rate, does not need to be repaired, and does not cause the machining scrapping of the rotating shaft.
Optionally, as shown in fig. 4, the elastic clamping cylinder 30 is in a hollow cylinder shape with two ends connected, and the elastic clamping cylinder 30 is located between the limiting step surface 202 of the connecting seat assembly 20 and the outer circular flange 101 at the large end of the rotating shaft 10. The closing end 31 of the elastic clamping cylinder 30 close to the outer circular flange is provided with a conical outer circular conical surface 301, and the large end of the outer circular conical surface 301 is close to the limiting step surface 202. A plurality of furling notched grooves 302 are circumferentially spaced on the furling end 31 of the elastic clip cylinder 30, each furling notched groove 302 extends from the end surface of the furling end 31 to the direction of the limit end 32 opposite to the furling end 31, and each furling notched groove 302 penetrates through the wall body of the elastic clip cylinder 30, so that when an annular and radial acting force is applied to the elastic clip cylinder 30, the furling end 31 of the elastic clip cylinder 30 can be furled inwards in the radial direction, and the furling end 31 can clamp the positioning circular surface 104 of the rotating shaft 10, i.e., the large end of the rotating shaft 10. Preferably, the spring clip cylinder 30 is made of 9SiCr material, the heat treatment hardness is HRC40-45, the wear resistance is good, and the service life of the spring clip cylinder 30 is prolonged.
Preferably, as shown in fig. 4, the furling notched groove 302 includes a straight line segment, and a waist-shaped segment, which is connected to the straight line segment along the axial direction and has a waist shape, the straight line segment is communicated with the end surface of the furling end 31, and the groove width of the waist-shaped segment is larger than that of the straight line segment. By making the furling notch groove 302 include a straight line segment and a waist-shaped segment connected in the axial direction, and making the groove width of the waist-shaped segment larger than that of the straight line segment, the elasticity of the furling end 31 can be enhanced, and the furling end 31 can be contracted more and more easily. Referring to fig. 6, a plurality of anti-rotation notch grooves 303 are formed at intervals along the circumferential direction on the limiting end 32 of the elastic clamping cylinder 30, each anti-rotation notch groove 303 extends from the end surface of the limiting end 32 to the closing end 31, each anti-rotation notch groove 303 penetrates through the side wall of the elastic clamping cylinder 30, and the anti-rotation notch grooves 303 are used for inserting the anti-rotation rods 60 connected to the connecting seat assembly 20 to prevent the elastic clamping cylinder 30 from rotating under the action of the locking cylinder set 40. Specifically, as shown in fig. 6, the rotation preventing bar 60 is vertically inserted into the corresponding rotation preventing notch groove 303 to prevent the elastic clamp cylinder 30 from rotating under the action of the locking cylinder group 40, thereby affecting the stability of clamping the elastic clamp cylinder 30 to the rotating shaft 10.
Alternatively, as shown in fig. 3, 5 and 7, the locking cylinder set 40 includes a clamping cylinder 41 sleeved outside the elastic clamping cylinder 30 and a locking cylinder 42 sleeved on the connecting seat assembly 20, and both the clamping cylinder 41 and the locking cylinder 42 are hollow cylinders with two ends communicated. The clamping cylinder 41 comprises a clamping end 411 and a force bearing end 412 arranged opposite to the clamping end 411, an inner conical surface 401 matched with the outer conical surface 301 on the furling end 31 is arranged in the shaft hole of the clamping end 411, and a convex and annular force bearing flange 402 is arranged on the outer circle of the force bearing end 412. The locking cylinder 42 comprises a force application end 421 and a locking end 422 opposite to the force application end 421, a force application flange 403 which protrudes towards the center and is annular is arranged in a shaft hole of the force application end 421, the force application flange 403 is used for being abutted against the force application flange 402 along the axial direction so as to connect the locking cylinder 42 with the clamping cylinder 41, an internal thread which is matched with an external thread on the excircle of the connecting seat assembly 20 is further arranged in the shaft hole of the locking end 422, so that the locking cylinder 42 pulls the clamping cylinder 41 to move towards the limiting end 32 of the elastic clamping cylinder 30 along the axial direction in the process of screwing the locking cylinder 42, and further the clamping cylinder 41 applies a radially inward clamping force to the elastic clamping cylinder 30.
As shown in fig. 3, after clamping, the clamping cylinder 41 is sleeved on the elastic clamping cylinder 30 and the connecting socket assembly 20, the inner conical surface 401 of the clamping end 411 of the clamping cylinder 41 is matched with the outer conical surface 301 of the elastic clamping cylinder 30, the locking cylinder 42 is sleeved on the clamping cylinder 41 and the connecting socket assembly 20, the locking cylinder 42 is abutted against the force-applying flange 402 of the force-applying end 421 of the locking cylinder 42, and is further axially connected with the clamping cylinder 41, so when the locking cylinder 42 is tightened, the locking cylinder 42 moves towards the position-limiting end 32 of the elastic clamping cylinder 30, and further the clamping cylinder 41 is pulled to slide towards the position-limiting end 32 of the elastic clamping cylinder 30, when the clamping cylinder 41 slides towards the position-limiting end 32 of the elastic clamping cylinder 30, due to the matching of the inner conical surface 401 of the clamping cylinder 41 and the outer conical surface 301 of the elastic clamping cylinder 30, the contracting end 31 of the elastic clamping cylinder 30 is applied with annular and radially inward clamping force, the closed end 31 of the elastic clamping cylinder 30 is closed radially inward to clamp the large end of the rotating shaft 10 by the clamping force. Preferably, the clamping cylinder 41 is made of superhard aluminum alloy 7075-T6, and the surface hardness of the clamping cylinder reaches HRC60 after micro-arc oxidation, so that the weight of the clamp is greatly reduced, the clamp is convenient to clamp, disassemble and carry, the load of a connecting main shaft connected with the clamp on grinding equipment can be reduced, the machining rigidity is improved, the machining precision of the rotating shaft is good, and the qualified rate of the machined rotating shaft is high.
Preferably, as shown in fig. 3, a plurality of limit stop pins 70 are further connected to the connecting seat assembly 20. Referring to fig. 5, a plurality of guide grooves 404 cooperating with a plurality of limit stop pins 70 are disposed in the shaft hole of the stressed end 412 of the clamping cylinder 41, each guide groove 404 extends from the stressed end 412 to the clamping end 411, and the guide grooves 404 are used for inserting the correspondingly disposed limit stop pins 70 to guide the sliding of the clamping cylinder 41 and prevent the clamping cylinder 41 from rotating under the action of the locking cylinder 42, thereby affecting the clamping performance of the clamping cylinder 41 on the elastic clamping cylinder 30. Preferably, as shown in fig. 3 and 5, a plurality of relief notch grooves 405 are formed in the clamping end 411 of the clamping cylinder 41 at intervals in the circumferential direction, each relief notch groove 405 extends from the end surface of the clamping end 411 to the force receiving end 412, each relief notch groove 405 penetrates through the wall body of the clamping cylinder 41, and the relief notch grooves 405 are used for relieving the measuring tool for measuring the wall thickness of the clamping end 411. Preferably, as shown in fig. 7, the locking cylinder set 40 further includes a locking pin 43, the locking pin 43 is configured to be inserted into the mounting pin hole 406 of the clamping cylinder 41 when the force receiving flange 402 abuts against the force applying flange 403 to detect whether the force receiving flange 402 abuts against the force applying flange 403, and the locking pin 43 is further configured to abut against the end surface of the force applying end 421 of the locking cylinder 42 to prevent the locking cylinder 42 from being unscrewed. In actual design, when the force receiving flange 402 and the force applying flange 403 are pushed tightly in the axial direction, the locking pin 43 can be inserted into the mounting pin hole 406 on the clamping cylinder 41, so that whether the locking pin 43 can be inserted into the mounting pin hole 406 can be determined, whether the force receiving flange 402 is pushed tightly against the force applying flange 403 can be determined, when the locking pin 43 is inserted into the mounting pin hole 406, the side wall of the locking pin pushes against the end surface of the force applying end 421 of the locking cylinder 42, the locking cylinder 42 can be prevented from rotating and loosening, and the locking stability of the locking cylinder 42 can be enhanced. Preferably, as shown in fig. 7, a plurality of concave insertion holes 407 are provided on the outer cylindrical surface of the locking cylinder 42, and the insertion holes 407 are used for inserting an auxiliary tool such as an iron rod to assist in screwing the locking cylinder 42.
Alternatively, as shown in fig. 3, the compression assembly 50 includes a clamp plate 51, sets of hook bolt members 52, a tie rod shaft 53, and a lock nut 54. The clamp plate 51 is disposed in the shaft hole of the large end of the rotating shaft 10 and is abutted against the first annular surface 1021 of the inner hole flange 102. Sets of hook bolt members 52 are mounted on the clamping plate 51, the hook bolt members 52 being adapted to abut against the second annular surface 1022 of the bore flange 102 to cooperatively clamp the bore flange 102 relative thereto by the clamping plate 51. One end of the pull rod shaft 53 is connected with the connecting seat assembly 20, the other end of the pull rod shaft 53 axially penetrates through the clamping plate 51, and a locking nut 54 is in threaded connection with the outer circle of the shaft body penetrating through the clamping plate 51, so that the rotating shaft 10 and the positioning surface 201 of the connecting seat assembly 20 are tightly pressed in the process of screwing the locking nut 54.
Specifically, as shown in FIG. 3, the outer circumference of the clamping plate 51 is provided with a limit step surface, which abuts against the first annular surface 1021 of the inner bore flange 102. Each hook bolt 52 comprises a hook bolt and a lock nut screwed on the hook bolt, the hook bolt is slidably inserted into the clamp plate 51, when the clamp is clamped, the lock nut on the hook bolt is firstly unscrewed, then the hook bolt is rotated to make the hook head of the hook bolt align with the second ring surface 1022 of the inner hole flange 102, then the lock nut is screwed again, the lock bolt pulls the hook bolt to make the hook head of the hook bolt press against the second ring surface 1022, so that the inner hole flange 102 is clamped between the hook head of the hook bolt and the limit step surface of the clamp plate 51, and the rotating shaft 10 and the pressing assembly 50 are clamped into a whole. One end of the pull rod shaft 53 is connected with the connecting seat assembly 20 through a thread, the other end of the pull rod shaft 53 is slidably inserted through the clamping plate 51 along the axial direction, and the outer circle of the shaft body inserted through the clamping plate 51 is connected with the lock nut 54 through a thread, so that the clamping plate 51 and the hook bolt 52 integrally move towards the connecting seat assembly 20 in the process of screwing the lock nut 54, and the rotating shaft 10 is further pressed against the positioning surface 201 of the connecting seat assembly 20. Preferably, the hold-down assembly 50 further includes a stop pin 55 provided corresponding to each hook bolt piece 52, the stop pin 55 being perpendicularly connected to the clamp plate 51, the stop pin 55 being adapted to abut against the corresponding hook bolt piece 52 to limit the position of the hook bolt piece 52 and prevent rotation of the hook bolt piece 52 during machining.
Alternatively, as shown in fig. 3, 8 and 9, the connecting socket assembly 20 includes a connecting base set for detachable connection with the grinding machine, a positioning cylinder base 21 for positioning the rotating shaft 10, and a mounting cylinder base 22 for mounting the locking cylinder set 40. After the connecting base group part is inserted into a machine tool spindle of the grinding processing equipment, the exposed part of the connecting base group part is detachably connected with a connecting flange disc at the end part of the machine tool spindle. The positioning cylinder seat 21 is a hollow cylinder with two communicated ends, the elastic clamping cylinder 30 is sleeved outside the positioning cylinder seat 21, the first end of the positioning cylinder seat 21 abuts against the connecting base group and is detachably connected with the connecting base group through a first connecting piece, and the end face of the second end of the positioning cylinder seat 21 forms a positioning surface 201. Specifically, as shown in fig. 8, the first connecting member is a connecting screw; a plurality of weight reduction windows 210 for reducing the weight of the positioning cylinder base 21 are respectively processed on the side wall of the positioning cylinder base 21 and the end surface close to the connecting base group. The installation barrel seat 22 is a hollow barrel shape with two communicated ends and is sleeved outside the elastic clamping barrel 30, the first end of the installation barrel seat 22 is abutted to the connection base group and is detachably connected with the connection base group through the second connecting piece, an external thread connected with the locking barrel group 40 in a threaded mode is arranged on the excircle of the first end of the installation barrel seat 22, and an installation through hole 220 used for installing the limiting stop pin 70 is perpendicularly arranged on the excircle of the second end of the installation barrel seat 22.
Further, as shown in fig. 3, the connection base set includes a flange 23 for detachably connecting with a spindle of a machine tool, a positioning bushing 24, and a connection base 25. Referring to fig. 10 again, the flange 23 includes a connecting shaft for insertion into the shaft hole of the spindle of the machine tool, and a connecting plate connected to the connecting shaft for connection to a flange at the end of the spindle of the machine tool, specifically, the outer conicity of the connecting shaft is equal to the inner bore taper of the shaft hole of the spindle of the machine tool for connection and positioning. The positioning bush 24 is connected with the connecting base 25, two ends of the positioning bush 24 are respectively inserted into the end face of the second end of the flange plate 23 and the end face of the first end of the connecting base 25, the pull rod shaft 53 penetrates through the positioning cylinder seat 21 and then is in threaded connection with the positioning bush 24, and the positioning bush 24 is used for positioning when the connecting base 25 is connected with the flange plate 23. Referring to fig. 11, the connection base 25 is detachably connected to the connection pad of the flange 23, the second end face of the connection base 25 forms a limiting step face 202, and the positioning barrel holder 21 and the mounting barrel holder 22 are detachably connected to the connection base 25, respectively. Preferably, the connecting base 25 is made of superhard aluminum alloy 7075-T6, and the surface hardness of the connecting base reaches HRC60 after micro-arc oxidation, so that the weight of the clamp is greatly reduced, the clamp is convenient to clamp, disassemble and carry, the load of a connecting main shaft connected with the clamp on grinding equipment can be reduced, the machining rigidity is improved, the machining precision of the rotating shaft is good, and the qualified rate of the machined rotating shaft is high.
Referring to fig. 1 to 3, a preferred embodiment of the present invention also provides a rotating shaft machining method including the steps of:
clamping the composite grinding clamp to grinding equipment.
And clamping and fixing the rotating shaft 10 to be machined on the composite grinding clamp.
And machining all the excircle to be machined on the rotating shaft 10 and the small end face of the rotating shaft 10.
And machining an inner hole A to be machined in the rotating shaft 10.
And machining an inner hole B to be machined in the rotating shaft 10.
In the method for processing the rotating shaft, the rotating shaft 10 to be processed is clamped and positioned by adopting the composite grinding clamp of any one of the grinding tools, so that the processing of the part to be processed of the outer circle, the inner hole and the small end surface of the rotating shaft 10 can be realized by one-time clamping, the processing steps are less, the processing efficiency is high, and the labor intensity of workers is low; and because the clamping and positioning reference does not need to be changed in the whole machining process, the machined rotating shaft has high precision and high qualification rate, does not need to be repaired, and does not cause the machining scrapping of the rotating shaft.
Specifically, the composite grinding jig as described in any one of the above is clamped to a numerically controlled universal grinder. The method specifically comprises the following steps of clamping and fixing a rotating shaft 10 to be machined on a numerical control universal grinder: loosening the lock cylinder 42 and the lock nut 54; the rotating shaft 10 is installed, and the hook bolt is rotated until the hook bolt is blocked by the corresponding stop pin 55 and can not rotate; tightening the locking nut 54 on the pull rod shaft 53 moves the clamp plate 51 toward the connection base set, causing the hook head of the hook bolt to press against the second annular surface 1022 of the bore flange 102; the locking cylinder 42 is rotated to drive the clamping cylinder 41 to slide, the inner conical surface 401 of the clamping cylinder 41 generates clamping force on the outer conical surface 301 of the elastic clamping cylinder 30, so that the furling end 31 of the elastic clamping cylinder 30 is furled inwards along the radial direction, and the positioning round surface 104 at the large end of the rotating shaft 10 is clamped; and (4) aligning the excircle reference of the rotating shaft 10 for machining.
Optionally, the processing of all the outer circles to be processed on the rotating shaft 10 and the small end surface of the rotating shaft 10 includes the following steps:
the type, specification and abrasive material of the grinding wheel are selected, and the grinding speed and the cooling condition during grinding of the grinding wheel are set.
And grinding all the to-be-processed excircles on the rotating shaft 10 and the small end face of the rotating shaft 10 according to the procedures of coarse grinding, semi-fine grinding and fine grinding.
Specifically, the type, specification and abrasive material of the grinding wheel are selected, and the grinding speed and the cooling condition during grinding of the grinding wheel are specifically set as follows: the specification of the grinding wheel is as follows: phi 500mm (outer diameter) × phi 127mm (inner diameter) × 50mm (width); grinding wheel type: 5SG microcrystalline corundum grinding wheel; the grinding material component ratio: 50% SG abrasive + 50% sintered abrasive; grinding speed: 35 m/s; cooling conditions: the water-based emulsion has the volume concentration of 8 percent, the flow rate of 60L/min and the pressure of 2 Mpa.
Specifically, grinding all the to-be-processed excircles on the rotating shaft 10 and the small end face of the rotating shaft 10 according to the rough grinding, semi-finish grinding and finish grinding processes comprises the following steps:
roughly grinding all the excircle to be processed on the rotating shaft 10 and the small end face of the rotating shaft 10, and reserving a margin of 0.02mm-0.05mm at the grinding part, wherein the grinding margin of the small end face needs to be recorded;
checking whether the coaxiality of the excircle C and the excircle D of the rotating shaft 10 is within 0.005mm by using a dial indicator, and if the coaxiality exceeds 0.005mm, re-aligning;
carrying out semi-fine grinding and fine grinding processing on the end face of the small end to ensure that the total length of the rotating shaft 10 is qualified;
and all the to-be-processed excircles on the semi-fine grinding and fine grinding rotating shaft 10 are ensured to be qualified in size.
Optionally, the machining of the inner hole a to be machined in the rotating shaft 10 specifically includes the following steps:
the type, specification and abrasive material of the grinding wheel are selected, and the grinding speed and the cooling condition during grinding of the grinding wheel are set.
And grinding the inner hole A according to the procedures of coarse grinding, semi-fine grinding and fine grinding.
Specifically, the type, specification and abrasive material of the grinding wheel are selected, and the grinding speed and the cooling condition during grinding of the grinding wheel are set, specifically: the specification of the grinding wheel is as follows: phi 40mm (outer diameter) x phi 20mm (inner diameter) x 25mm (width); grinding wheel type: 5SG middle pore grinding wheel; the grinding material component ratio: 50% SG abrasive + 50% sintered abrasive; grinder bar size (no mounting part): Φ 25mm (outer diameter) × 62mm (length); grinding speed: 28 m/s; cooling conditions: the water-based emulsion has the volume concentration of 8 percent, the flow rate of 60L/min and the pressure of 2 Mpa.
Specifically, the inner hole A is ground according to the procedures of coarse grinding, semi-fine grinding and fine grinding, and the method specifically comprises the following steps:
trimming the outer circle of the grinding wheel, ensuring that the jumping of the grinding wheel is qualified, and ensuring that the grinding wheel is sharp, wherein the trimming amount of the grinding wheel is 0.1 mm;
roughly grinding the inner hole A, wherein the unilateral feeding of a grinding wheel is 0.03 mm;
trimming the excircle of the grinding wheel, wherein the trimming amount is 0.02 mm;
semi-finish grinding the inner hole A, wherein the unilateral feeding of the grinding wheel is 0.01mm, and a finish grinding allowance of 0.01mm is reserved;
trimming the excircle of the grinding wheel, wherein the trimming amount is 0.01 mm;
and (3) finely grinding the inner hole A, wherein the unilateral feeding of the grinding wheel is 0.002mm, and the grinding wheel is dressed once in each grinding period, and the dressing amount is 0.01mm each time.
Optionally, the machining of the inner hole B to be machined in the rotating shaft 10 specifically includes the following steps:
the type, specification and abrasive material of the grinding wheel are selected, and the grinding speed and the cooling condition during grinding of the grinding wheel are set.
And grinding the inner hole B according to the procedures of coarse grinding, semi-fine grinding and fine grinding.
Specifically, the type, specification and abrasive material of the grinding wheel are selected, and the grinding speed and the cooling condition during grinding of the grinding wheel are set, specifically: the specification of the grinding wheel is as follows: phi 32mm (outer diameter) x phi 13mm (inner diameter) x 25mm (width); grinding wheel type: 5SG middle pore grinding wheel; the grinding material component ratio: 50% SG abrasive + 50% sintered abrasive; grinder bar size (no mounting part): Φ 25mm (outer diameter) × 62mm (length); grinding speed: 28 m/s; cooling conditions: the water-based emulsion has the volume concentration of 8 percent, the flow rate of 60L/min and the pressure of 2 Mpa.
Specifically, the inner hole B is ground according to the procedures of coarse grinding, semi-fine grinding and fine grinding, and the method specifically comprises the following steps:
replacing the grinding wheel;
trimming the outer circle of the grinding wheel, ensuring that the jumping of the grinding wheel is qualified, and ensuring that the grinding wheel is sharp, wherein the trimming amount is 0.1 mm;
roughly grinding the inner hole B, wherein the unilateral feeding of a grinding wheel is 0.02 mm;
trimming the excircle of the grinding wheel, wherein the trimming amount is 0.02 mm;
semi-finish grinding the inner hole B, wherein the single-side feed of the grinding wheel is 0.01mm, and a finish grinding allowance of 0.01mm is reserved;
trimming the excircle of the grinding wheel, wherein the trimming amount is 0.01 mm;
and (3) finely grinding the inner hole B, wherein the unilateral feeding of the grinding wheel is 0.002mm, and the grinding wheel is dressed once in each grinding period, and the dressing amount is 0.01mm each time.
Preferably, before the step of "clamping and fixing the rotating shaft 10 to be machined on the composite grinding jig", the method further comprises the steps of:
the rotating shaft 10 to be processed is subjected to rough grinding processing.
The rotating shaft 10 to be processed is subjected to rough grinding processing, so that the processing amount of subsequent grinding of the rotating shaft 10 is reduced, the processing efficiency is further improved, and meanwhile, the clamping positioning datum on the rotating shaft 10, namely the inner hole flange 102, the support end face 103 and the positioning circular face 104 are subjected to rough grinding processing and then clamped on the composite grinding clamp, so that the positioning and clamping accuracy can be improved.
The rough grinding processing is carried out on the rotating shaft 10 to be processed, and the method specifically comprises the following steps:
roughly grinding the C outer circle and the D outer circle of the rotating shaft 10, reserving a grinding amount of 0.15-0.2 mm for the composite grinding process, and simultaneously ensuring that the coaxiality of the C outer circle and the D outer circle is within 0.005 mm;
the total length m of the rotating shaft 10 is checked, and the machining allowance of the small end face is calculated and recorded.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A composite grinding fixture is used for clamping and positioning a rotating shaft (10) to be machined, an inner hole flange (102) is arranged in a shaft hole at the large end of the rotating shaft (10), the outer side wall surface of the large end of the rotating shaft (10) is a positioning round surface (104), and the composite grinding fixture is characterized in that,
the composite grinding clamp comprises a connecting seat assembly (20) detachably connected with grinding equipment, a positioning surface (201) which is used for being attached to a supporting end surface (103) of the large end of the rotating shaft (10) to axially position the rotating shaft (10) is arranged on the connecting seat assembly (20), an elastic clamping cylinder (30) is sleeved on the connecting seat assembly (20), and the elastic clamping cylinder (30) is used for being folded in along the radial direction under external force extrusion to clamp a positioning circular surface (104) of the large end of the rotating shaft (10);
a locking cylinder group (40) is sleeved outside the elastic clamping cylinder (30), the elastic clamping cylinder (30) is in conical surface fit with the locking cylinder group (40), the locking cylinder group (40) is in threaded connection with the outer circular surface of the connecting seat assembly (20), so that the locking cylinder group (40) applies radial acting force to the elastic clamping cylinder (30) in the process of screwing the locking cylinder group (40), and the elastic clamping cylinder (30) is folded inwards in the radial direction to clamp the positioning circular surface (104) of the rotating shaft (10);
the composite grinding clamp further comprises a pressing component (50) installed in a large-end shaft hole of the rotating shaft (10), wherein the pressing component (50) is used for being connected with the connecting seat assembly (20) and axially clamping the inner hole flange (102) so as to press the rotating shaft (10) and the positioning surface (201).
2. The composite grinding jig of claim 1,
the elastic clamping cylinder (30) is in a hollow cylinder shape with two communicated ends, and the elastic clamping cylinder (30) is positioned between a limiting step surface (202) of the connecting seat assembly (20) and an excircle flange (101) at the large end of the rotating shaft (10);
a conical outer conical surface (301) is arranged at a furling end (31) of the elastic clamping cylinder (30) close to the outer circular flange, and the large end of the outer conical surface (301) is close to the limiting step surface (202);
a plurality of furling notched grooves (302) are formed in the furling end (31) of the elastic clamping cylinder (30) at intervals along the circumferential direction, each furling notched groove (302) extends from the end surface of the furling end (31) to the direction of the limiting end (32) opposite to the furling end (31), and each furling notched groove (302) penetrates through the wall body of the elastic clamping cylinder (30).
3. The composite grinding jig of claim 2,
the furling notch groove (302) comprises a linear section and a waist-shaped section, wherein the linear section is axially connected with the linear section and is waist-shaped, the linear section is communicated with the end surface of the furling end (31), and the groove width of the waist-shaped section is larger than that of the linear section;
be equipped with on the spacing end (32) of an elastic clamp section of thick bamboo (30) along the many of circumference interval setting prevent changeing breach groove (303), each prevent changeing breach groove (303) by the terminal surface of spacing end (32) is towards draw in end (31) extension, and each prevent changeing breach groove (303) and run through the lateral wall of an elastic clamp section of thick bamboo (30), prevent changeing breach groove (303) and be used for supplying connect in prevent changeing stick (60) on connecting seat assembly (20) and insert, prevent that an elastic clamp section of thick bamboo (30) is in rotate under the effect of locking section of thick bamboo group (40).
4. The composite grinding jig of claim 2,
the locking cylinder group (40) comprises a clamping cylinder (41) sleeved outside the elastic clamping cylinder (30) and a locking cylinder (42) sleeved on the connecting seat assembly (20), and the clamping cylinder (41) and the locking cylinder (42) are both in a hollow cylinder shape with two communicated ends;
the clamping cylinder (41) comprises a clamping end (411) and a stress end (412) opposite to the clamping end (411), an inner conical surface (401) matched with the outer conical surface (301) on the folding end (31) is arranged in a shaft hole of the clamping end (411), and an outer convex annular stress flange (402) is arranged on the outer circle of the stress end (412);
the locking cylinder (42) comprises a force application end (421) and a locking end (422) opposite to the force application end (421), a force application flange (403) which protrudes towards the center and is annular is arranged in a shaft hole of the force application end (421), the force application flange (403) is used for being abutted against the force application flange (402) along the axial direction to enable the locking cylinder (42) to be connected with the clamping cylinder (41), an internal thread matched with the external thread on the excircle of the connecting seat assembly (20) is further arranged in the shaft hole of the locking end (422), so that the locking cylinder (42) pulls the clamping cylinder (41) to move towards the limiting end (32) of the elastic clamping cylinder (30) along the axial direction in the process of screwing the locking cylinder (42), and further the clamping cylinder (41) applies a radially inward clamping force to the elastic clamping cylinder (30).
5. The composite grinding jig of claim 4,
the connecting seat assembly (20) is also connected with a plurality of limiting stop pins (70);
a plurality of guide grooves (404) which are matched with the limiting stop pins (70) are arranged in the shaft hole of the stress end (412) of the clamping cylinder (41), each guide groove (404) extends from the stress end (412) to the clamping end (411), and the guide grooves (404) are used for inserting the correspondingly arranged limiting stop pins (70) to guide the sliding of the clamping cylinder (41) and prevent the clamping cylinder (41) from rotating under the action of the locking cylinder (42);
a plurality of avoiding notch grooves (405) are formed in the clamping end (411) of the clamping cylinder (41) at intervals along the circumferential direction, each avoiding notch groove (405) extends from the end face of the clamping end (411) to the stressed end (412), each avoiding notch groove (405) penetrates through the wall body of the side wall of the clamping cylinder (41), and the avoiding notch grooves (405) are used for avoiding a measuring tool for measuring the wall thickness of the clamping end (411);
the locking cylinder group (40) further comprises a locking pin (43), the locking pin (43) is used for being inserted into a mounting pin hole (406) of the clamping cylinder (41) when the force-bearing flange (402) is tightly pressed with the force-applying flange (403) to detect whether the force-bearing flange (402) is tightly pressed with the force-applying flange (403), and the locking pin (43) is also used for abutting against the end face of a force-applying end (421) of the locking cylinder (42) to prevent the locking cylinder (42) from being rotated and loosened.
6. The composite grinding jig of claim 1,
the compression assembly (50) comprises a clamping plate (51), a plurality of groups of hook-shaped bolt pieces (52), a pull rod shaft (53) and a locking nut (54);
the clamping plate (51) is used for being arranged in a shaft hole at the large end of the rotating shaft (10) and is used for abutting against a first annular surface (1021) of the inner hole flange (102);
a plurality of sets of said hook bolt members (52) mounted on said clamping plate (51), said hook bolt members (52) adapted to abut against a second annular surface (1022) of said bore flange (102) to cooperatively clamp said bore flange (102) relative thereto;
one end of the pull rod shaft (53) is connected with the connecting seat assembly (20), the other end of the pull rod shaft (53) penetrates through the clamping plate (51) along the axial direction, and the outer circle of the shaft body behind the clamping plate (51) is connected with the locking nut (54) in a threaded mode, so that the locking nut (54) is screwed down, and the rotating shaft (10) and the positioning surface (201) of the connecting seat assembly (20) are compressed.
7. The composite grinding jig of claim 5,
the connecting seat assembly (20) comprises a connecting base group detachably connected with grinding equipment, a positioning cylinder seat (21) used for positioning the rotating shaft (10), and an installation cylinder seat (22) used for installing the locking cylinder group (40);
after the connecting base group part is inserted into a machine tool spindle of the grinding processing equipment, the exposed part of the connecting base group part is detachably connected with a connecting flange disc at the end part of the machine tool spindle;
the positioning cylinder seat (21) is in a hollow cylinder shape with two communicated ends, the elastic clamping cylinder (30) is sleeved outside the positioning cylinder seat (21), the first end of the positioning cylinder seat (21) abuts against the connecting base group and is detachably connected with the connecting base group through a first connecting piece, and the end face of the second end of the positioning cylinder seat (21) forms the positioning surface (201);
the mounting barrel seat (22) is hollow tube-shape and suit that both ends communicate in outside the elastic clamp section of thick bamboo (30), the first end top of mounting barrel seat (22) is supported connect the base group and through the second connecting piece with connect the detachable connection of base group, be equipped with on the excircle of mounting barrel seat (22) first end with locking section of thick bamboo group (40) threaded connection's external screw thread, be equipped with perpendicularly on the excircle of mounting barrel seat (22) second end and be used for the installation mounting through-hole (220) of spacing backing pin (70).
8. The composite grinding jig of claim 7,
the connecting base group comprises a flange plate (23) detachably connected with the machine tool spindle, a positioning bushing (24) and a connecting base (25);
the flange plate (23) comprises a connecting shaft inserted into the shaft hole of the machine tool spindle and a connecting disc connected with the connecting shaft and used for being connected with a connecting flange plate at the end part of the machine tool spindle;
the positioning bush (24) is connected with the connecting base (25), and two ends of the positioning bush (24) are respectively inserted into the end face of the second end of the flange plate (23) and the end face of the first end of the connecting base (25);
connect base (25) with the connection pad detachable connection of ring flange (23), just connect base (25) second end terminal surface and form spacing step face (202), location cylinder base (21) with installation cylinder base (22) respectively with connect base (25) detachable connection.
9. A rotating shaft machining method is characterized by comprising the following steps:
clamping the composite grinding jig of any one of claims 1 to 8 to a grinding apparatus;
clamping and fixing a rotating shaft (10) to be machined onto the composite grinding fixture;
machining all to-be-machined excircles on the rotating shaft (10) and the small end face of the rotating shaft (10);
machining an inner hole A to be machined in the rotating shaft (10);
and machining an inner hole B to be machined in the rotating shaft (10).
10. The rotating shaft machining method according to claim 9,
the machining of all the to-be-machined excircles on the rotating shaft (10) and the small end face of the rotating shaft (10) comprises the following steps:
selecting the type, specification and abrasive of the grinding wheel, and setting the grinding speed and the cooling condition of the grinding wheel during grinding;
grinding all the to-be-machined excircles on the rotating shaft (10) and the small end face of the rotating shaft (10) according to the procedures of coarse grinding, semi-fine grinding and fine grinding;
the machining of the inner hole A to be machined in the rotating shaft (10) specifically comprises the following steps:
selecting the type, specification and abrasive of the grinding wheel, and setting the grinding speed and the cooling condition of the grinding wheel during grinding;
grinding the inner hole A according to the procedures of coarse grinding, semi-fine grinding and fine grinding;
the machining of the inner hole B to be machined in the rotating shaft (10) specifically comprises the following steps:
selecting the type, specification and abrasive of the grinding wheel, and setting the grinding speed and the cooling condition of the grinding wheel during grinding;
and grinding the inner hole B according to the procedures of coarse grinding, semi-fine grinding and fine grinding.
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| CN201910889969.1A CN110712127B (en) | 2019-09-20 | 2019-09-20 | Composite grinding clamp and rotating shaft machining method |
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| CN201910889969.1A CN110712127B (en) | 2019-09-20 | 2019-09-20 | Composite grinding clamp and rotating shaft machining method |
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