CN112170985A - Centering fastening method and clamp for internal spline gear grinding - Google Patents
Centering fastening method and clamp for internal spline gear grinding Download PDFInfo
- Publication number
- CN112170985A CN112170985A CN202011094971.9A CN202011094971A CN112170985A CN 112170985 A CN112170985 A CN 112170985A CN 202011094971 A CN202011094971 A CN 202011094971A CN 112170985 A CN112170985 A CN 112170985A
- Authority
- CN
- China
- Prior art keywords
- cam
- internal spline
- eccentric
- gear
- eccentric arc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F23/00—Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
- B23F23/02—Loading, unloading or chucking arrangements for workpieces
- B23F23/06—Chucking arrangements
Abstract
The invention discloses a centering and fastening method and a fixture for gear grinding of an internal spline gear, which are characterized in that a cam with a plurality of eccentric cambered surfaces is sleeved on a mandrel, when the cam is clamped, a gear to be ground with the internal spline is sleeved on the cam, and by utilizing the characteristic that the distance between any point of the internal spline and the eccentric cambered surfaces can be reduced from large to small when the cam rotates in an internal spline hole, an intermediate part is placed between the spline and the eccentric cambered surfaces, the cam is rotated to enable the eccentric cambered surfaces to push the intermediate part radially outwards, and when the cam cannot rotate in the internal spline hole, all the intermediate parts are tightly pressed between the internal spline and the eccentric cambered surfaces, so that the clamping of the gear to be ground with the internal spline is realized, and the designed axial lead of the internal spline hole of the clamped gear to be ground is ensured to be coincident with the axial lead of the mandrel. In the structure of the invention, the intermediate part is the roller, and the invention has the advantages of convenient and quick workpiece clamping, high clamping precision and low manufacturing cost, and effectively improves the processing efficiency.
Description
Technical Field
The invention relates to a clamp, in particular to a centering fastening method and a clamp for gear grinding of an internal spline gear, and belongs to the field of gear machining tools.
Background
The internal spline gear is a transmission gear with an inner hole in positioning connection with the tooth surface of an external spline of a transmission shaft by adopting an involute tooth surface spline, when the internal spline gear is subjected to gear grinding, the tooth side of the internal spline is required to be centered in design, but an external spline positioning fixture in contact with the tooth surface of the internal spline needs to be manufactured, the precision requirement is high, the processing difficulty is high, the external spline positioning expansion sleeve is in surface contact with the internal spline tooth surface of a workpiece, the external spline positioning expansion sleeve is easily influenced by the deformation of the external spline positioning expansion sleeve and the internal spline of the workpiece, and the actually achieved positioning precision is difficult to control, so that the application of the positioning method adopting the external spline expansion sleeve is rare at present.
In the prior art, the positioning reference is usually converted into the addendum circle (namely the minor diameter of the spline hole) of the internal spline for positioning and processing, so that high coaxiality requirements on the processing of the major diameter, the minor diameter and the key side of the hot front internal spline are required, the processing cost and the processing difficulty of the spline are increased, the spline is affected by heat treatment deformation, and the change of the coaxiality of the major diameter, the minor diameter and the key side of the hot rear spline is large. Therefore, a process of grinding the inner bore of the spline (namely the minor diameter of the spline) is generally added before gear grinding, and the spline pitch circle needs to be manually aligned for centering when the inner bore is ground, so that the manual alignment efficiency is low, and great uncertainty exists. The method is difficult to eliminate the misalignment error of the reference, and the quality of the final product is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: when a workpiece with an internal spline is machined into a gear with the internal spline by grinding the outer periphery of the workpiece, the prior art is difficult to align and position the designed axial lead of the tooth top circle (namely the minor diameter circle of the internal spline) of the internal spline according to the design precision.
Aiming at the problems, the technical scheme provided by the invention is as follows:
a centering and fastening method for gear grinding of an internal spline gear is characterized in that a cam with a plurality of eccentric cambered surfaces is sleeved on a mandrel, when the gear to be ground with the internal spline is clamped, the gear to be ground with the internal spline is sleeved on the cam, and by utilizing the characteristic that the distance between any point of the internal spline and the eccentric cambered surfaces can be reduced from large to small when the cam rotates in an internal spline hole, an intermediate part is placed between the spline and the eccentric cambered surfaces, the cam is rotated to enable the eccentric cambered surfaces to push the intermediate part radially outwards, when the cam cannot rotate in the internal spline hole, all the intermediate parts are tightly pressed between the internal spline and the eccentric cambered surfaces, so that the gear to be ground with the internal spline is clamped, and the designed axial lead of the internal spline hole of the gear to be ground, which is clamped, is ensured to coincide with the axial lead of the mandrel.
Furthermore, the middle part is set as a cylindrical roller by utilizing the characteristic that tooth strengthening tooth surfaces on two sides of the internal spline tooth groove can provide limiting in two directions and the characteristic that the circular body can roll, the roller is inserted between the tooth groove and the eccentric arc surface at the maximum distance between the eccentric arc surface of the cam and the internal spline tooth groove during clamping, the cam is rotated to enable the eccentric arc surface to gradually compress the roller into the tooth groove during clamping, and when the cam cannot rotate in the internal spline hole, radial clamping of the gear to be ground with the internal spline is realized.
The method as described above further comprising forming the roller as an elastomer capable of flexing.
The method also comprises the steps of manufacturing the roller into a tubular body with a through hole along the axis, sleeving the roller on the string rod, and fixing one end of the string rod on a frame body; the diameter of the through hole is larger than the diameter of the string rod, and the roller can be pushed by the inner spline tooth groove of the eccentric cambered surface radially outward of the cam when the string rod is fixed.
Further, the number of eccentric cambered surfaces arranged on the periphery of the cam is selected to be 3 or 4, so that the diameters of all the rollers are equal; for the gear to be processed with the number of teeth of the internal spline being evenly divided by the number of eccentric cambered surfaces on the periphery of the cam, the eccentric cambered surfaces on the periphery of the cam are arranged in equal radian and equal arc length, and the circumferential intervals of the adjacent eccentric cambered surfaces on the periphery of the cam are equal.
Further, the number of eccentric arc surfaces arranged on the periphery of the cam is selected to be 3 or 4, the diameters of all the rollers are equal, for a gear to be processed, the number of teeth of the internal splines cannot be divided by the number of eccentric arc surfaces arranged on the periphery of the cam, one eccentric arc surface is selected to be a non-equal eccentric arc surface, the arc length and the arc degree of the non-equal eccentric arc surface are adjusted during setting, the non-equal eccentric arc surface can be more corresponding to one internal spline tooth groove or less corresponding to one internal spline tooth groove radially outwards compared with other eccentric arc surfaces, and when the other eccentric arc surfaces have one position and clamp the rollers between the corresponding internal spline tooth grooves, the non-equal eccentric arc surface also has one position and clamps the rollers between the corresponding internal spline tooth grooves.
The centering and fastening clamp for the internal spline gear grinding process, which is designed by the method, comprises a mandrel, a cam and a roller; the cam is sleeved on the mandrel, the peripheral surface of the cam is provided with a plurality of eccentric arc surfaces, the cam is positioned in an internal spline hole of an internal spline gear to be processed during clamping, and each eccentric arc surface is provided with a roller positioned between the eccentric arc surface and a tooth groove of the internal spline.
Furthermore, one end of the eccentric arc surface on the periphery of the cam is a near end close to the axial lead of the mandrel, and the other end of the eccentric arc surface is a far end away from the axial lead of the mandrel; a connecting surface is arranged between two adjacent eccentric cambered surfaces, one end of the connecting surface is intersected with the far-center end of one eccentric cambered surface, and the other end of the connecting surface is intersected with the near-center end of one eccentric cambered surface.
Further, the roller is a cylindrical spiral body with an axial through hole.
Furthermore, the gear grinding clamp further comprises a retainer, a lantern ring is arranged on the retainer and sleeved on the mandrel above the cam, a string rod extending to the periphery of the cam is arranged below the lantern ring facing the cam, and the roller is sleeved on the string rod.
The invention has the advantages that:
1. the invention adopts the cambered surface cam mandrel to realize the gapless positioning of the pitch circle of the tooth side of the internal spline, and the contact between the positioning surfaces is point-line contact, thereby achieving the high precision requirement.
2. In practical application, the workpiece can be conveniently and quickly clamped without manual alignment, and the processing efficiency is effectively improved
3. Compared with the method of positioning and processing the minor diameter of the spline, the method reduces a procedure of grinding the inner hole, does not need to adopt a composite broach, and reduces the manufacturing cost of the spline broach.
Drawings
FIG. 1 is a schematic sectional view of the fixture after clamping an internal spline gear;
FIG. 2 is a partial schematic view of FIG. 1;
FIG. 3 is a schematic view of the mandrel and a cam integrally formed with the mandrel;
FIG. 4 is a schematic cross-sectional view of the cam;
FIG. 5 is a schematic cross-sectional view of the internally splined gear mounted on the cam showing primarily the rollers located between the proximal end of the eccentric arc and the tooth slots;
FIG. 6 is a schematic cross-sectional view of the internally splined gear mounted to the cam, showing primarily the rollers between the distal end of the eccentric arc and the tooth slots;
FIG. 7 is a schematic cross-sectional view of a cam with a non-bisected eccentric arc surface for fixing the internal spline gear by radial expansion of a roller, wherein the eccentric arc surface is mainly shown to correspond radially outward to 7 tooth grooves of the internal spline, and the non-bisected eccentric arc surface corresponds radially outward to 8 tooth grooves of the internal spline;
FIG. 8 is a schematic view of the connecting surface of the roller sleeve on the boom;
FIG. 9 is a schematic partial cross-sectional view of the cage;
FIG. 10 is a schematic cross-sectional view of a skewer mounted on a collar.
In the figure: 1. a mandrel; 2. a cam; 21. an eccentric arc surface; 211. a proximal end; 212. a distal end; 23. a connecting surface; 24. non-equal division of the eccentric arc surface; 3. a roller; 31. a through hole; 4. a holder; 41. a collar; 42. a stringing rod; 5. a positioning ring; 51. a first positioning hole; 52. a second positioning hole; 53. a soft sleeve; 54. a fastening pin; 6. a gland; 7. a cross-shaped pressing frame; 8. fastening a nut; 9. an internal spline gear; 91. a tooth socket.
Detailed Description
The invention relates to a centering fastening method and a structure of a clamp for grinding internal spline gears, and for convenience of description and understanding, the basic structure and the application principle of the clamp designed according to the method of the invention are briefly described as follows:
the basic structure is as follows: as shown in fig. 1, 2 and 4, the clamp of the invention comprises a mandrel 1 and a cam 2 sleeved on the mandrel 1, wherein the peripheral surface of the cam 2 is provided with a plurality of eccentric arc surfaces 21, a positioning ring 5 sleeved on the mandrel 1 is arranged below the cam 2, a gland 6 sleeved on the mandrel 1 is arranged above the cam 2, a cross-shaped pressing frame 7 sleeved on the mandrel 1 is arranged above the gland 6, and a fastening nut 8 which is sleeved on the mandrel 1 and is in threaded fit with the mandrel 1 is arranged above the cross-shaped pressing frame 7.
The object to be processed by the present invention is an internally splined gear 9 having an internal spline.
And the machining task is to grind the outer periphery of the inner spline gear according to design requirements.
The processing measure is to utilize the cam 2 on the mandrel 1 to expand and fix the internal spline gear 9 from the internal spline hole radially outwards.
The requirement is that the axial core line of the internal spline hole of the internal spline gear 9 which is radially and outwards expanded and fixed is highly overlapped with the axial core line of the mandrel 1, so that the gear grinding machining precision of the internal spline gear 9 can be ensured.
The application principle is as follows: as shown in fig. 1, 2 and 5, during clamping, the internal spline gear 9 is sleeved on the cam 2 through the internal spline hole, each eccentric arc surface 21 on the cam 2 is provided with a roller 3 positioned between the eccentric arc surface 21 and a tooth groove 91 of the internal spline, when clamping, the cam 2 is rotated in the internal spline hole, the roller 3 is gradually squeezed between the eccentric arc surface 21 and the tooth groove 91 by utilizing the rotated eccentric arc surface 21, when the cam 2 cannot rotate, the internal spline gear 9 is radially fastened on the cam 2, and the designed axial core line of the internal spline hole is coincided with the axial core line of the mandrel 1. Obviously, the positioning ring 5 located below the cam 2, the gland 6 located above the cam 2, the cross-shaped pressure frame 7, the fastening nut and the like are used for axially fastening the internal spline gear 9.
The method of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 2-6, a centering fastening method for gear grinding of an internal spline gear is characterized in that a cam 2 with a plurality of eccentric cambered surfaces 21 is sleeved on a mandrel 1, when clamping is performed, a gear to be ground with the internal spline is sleeved on the cam 2, when the cam 2 rotates in an internal spline hole, the distance between any point of the internal spline and the eccentric cambered surfaces 21 can be reduced from large to small, an intermediate component is placed between the spline and the eccentric cambered surfaces 21 (in practical application, the intermediate component is firstly installed in the internal spline of the gear to be ground and then sleeved on the mandrel together), the cam 2 is rotated, the eccentric cambered surfaces 21 are made to radially push the intermediate component outwards, when the cam 2 cannot rotate in the internal spline hole, all the intermediate component are tightly pressed between the internal spline and the eccentric cambered surfaces 21, so that the clamping of the gear to be ground with the internal spline is realized, and the designed axial lead of the clamped internal spline hole of the gear to be ground of the mandrel is ensured to coincide with the axial lead of the mandrel 1. The positioning device has the advantages that the gapless positioning of the pitch circle of the tooth side of the internal spline can be realized, the contact between the positioning surfaces is point-line contact, the high precision requirement can be met, the workpiece can be clamped conveniently and quickly, the manual alignment is not needed, and the machining efficiency is effectively improved. Meanwhile, one inner hole grinding process commonly used in the prior art is reduced, a composite broach is not needed, the precision of the inner spline is improved, and the manufacturing cost of the spline broach is reduced.
The method is characterized in that the tooth strengthening tooth surfaces on two sides of the internal spline tooth groove 91 can provide limiting characteristics in two directions and the circular body can roll, the middle part is set to be the cylindrical roller 3, the roller 3 is inserted between the tooth groove 91 and the eccentric arc surface 21 at the position where the distance between the eccentric arc surface 21 of the cam and the internal spline tooth groove 91 is maximum during clamping, the cam 2 is rotated during clamping, the eccentric arc surface 21 gradually presses the roller 3 into the tooth groove 91 tightly, and when the cam 2 cannot rotate in the internal spline hole, radial fastening of a gear to be ground with the internal spline is achieved.
As shown in fig. 9, the method further comprises forming the roller 3 as an elastic body capable of bending. This arrangement enables the roller 3 to have a better surface adaptability and to be pressed tightly in the tooth groove 91 by the eccentric arc surface 21.
As shown in fig. 8 and 9, the method further comprises manufacturing the roller 3 into a tubular body with a through hole 31 along the axis, sleeving the roller 3 on the string rod 42, and fixing one end of the string rod 42 on a frame body; the diameter of the through hole 31 is larger than that of the string rod 42, so that the roller 3 can be pushed by the inner spline tooth groove 91 of the eccentric arc surface 21 radially outward of the cam when the string rod 42 is fixed.
As shown in fig. 5 and 6, in the above method, the number of the eccentric arc surfaces 21 arranged on the periphery of the cam 2 is selected to be 3 or 4, so that the diameters of all the rollers 3 are equal; for the gear to be processed with the number of teeth of the internal spline being evenly divided by the number of the eccentric arc surfaces 21 on the periphery of the cam, the eccentric arc surfaces 21 on the periphery of the cam 2 are arranged in equal radian and equal arc length, and the circumferential intervals of the adjacent eccentric arc surfaces 21 on the periphery of the cam 2 are equal. This is a very ideal situation in practical application, and each eccentric cambered surface 21 can radially outwards correspond the same number of internal spline tooth grooves 91, and under this situation, the above arrangement can ensure that the axle core line of the internal spline hole has extremely high coaxiality with the axle core line of the mandrel 1 after clamping.
As shown in fig. 7, for the gear to be processed whose number of teeth of the internal spline is not divisible by the number of eccentric arc surfaces 21 provided on the outer periphery of the cam, the number of eccentric arc surfaces 21 provided on the outer periphery of the cam 2 is also selected to be 3 or 4, so that the diameters of all the rollers 3 are equal. What is different is that one eccentric arc surface 21 at the periphery of the cam 2 needs to be selected as a non-equal eccentric arc surface 24, the arc length and the arc degree of the non-equal eccentric arc surface 24 are adjusted during setting, so that the non-equal eccentric arc surface 24 can be more radially outwards corresponding to one internal spline tooth groove 91 or less corresponding to one internal spline tooth groove 91 compared with other eccentric arc surfaces 21 (when the number of the eccentric arc surfaces on the cam 2 can be selected to be 3 or 4, only one non-equal eccentric arc surface 24 is more radially outwards corresponding to one internal spline groove 91 or less corresponding to one internal spline groove 91, other eccentric arc surfaces can all correspond to the same number of tooth grooves 91, as shown in fig. 7, the eccentric arc surfaces are radially outwards corresponding to 7 internal spline tooth grooves 91, and the non-equal eccentric arc surfaces are radially outwards corresponding to 8 internal spline tooth grooves 91), and when other eccentric arc surfaces 21 have a position to clamp the roller 3 between the corresponding internal spline grooves 91, so that the non-bisected eccentric arc 24 also has a position to clamp the roller 3 between the corresponding internal spline groove 91. This situation is also encountered in practical applications, and the above arrangement is to cope with this situation. By the method, the gear to be processed which cannot be evenly divided by the number of the eccentric arc surfaces 21 on the periphery of the cam can be quickly and coaxially fastened in a centering mode, only the unequally-divided eccentric arc surfaces 24 need to be debugged and processed when the cam 2 is manufactured, and the roller 3 is clamped between one position of other eccentric arc surfaces 21 and the corresponding spline tooth grooves 91, the roller 3 is clamped between one position of the unequally-divided eccentric arc surfaces 24 and the corresponding spline tooth grooves 91.
The structure of the jig of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 2, 3 and 4, the centering and fastening clamp for the gear grinding of the internal spline gear designed by the method comprises a mandrel 1, a cam 2 and a roller 3; the cam 2 is sleeved on the mandrel 1, the peripheral surface of the cam 2 is provided with a plurality of eccentric cambered surfaces 21, during clamping, the cam 2 is positioned in an internal spline hole of an internal spline gear to be processed, and each eccentric cambered surface 21 is provided with a roller 3 positioned between the eccentric cambered surface 21 and a tooth groove 91 of the spline. One end of the eccentric arc surface 21 on the periphery of the cam 2 is a near end 211 close to the axial lead of the mandrel 1, and the other end is a far end 212 far from the axial lead of the mandrel 1; a connecting surface 23 is arranged between two adjacent eccentric arc surfaces 21, one end of the connecting surface 23 is intersected with the distal end 212 of one eccentric arc surface 21, and the other end of the connecting surface 23 is intersected with the proximal end 211 of one eccentric arc surface 21. By the design, when clamping, the roller 3 can be easily inserted between the eccentric arc surface 21 and the radially corresponding internal spline tooth groove 91 at the proximal end 211 of the eccentric arc surface 21 because the distance between the proximal end 211 of the eccentric arc surface 21 and the tooth groove 91 is the largest, and then the cam 2 rotates in the internal spline hole, because of the limitation of the internal spline tooth groove 91, under the action of friction force given by the rotating eccentric arc surface 21, the roller 3 can only roll in place in the tooth groove 91 (when the distance between the eccentric arc surface 21 and the radially corresponding internal spline tooth groove 91 is larger, the roller 3 positioned between the eccentric arc surface 21 and the radially corresponding internal spline tooth groove 91 can not rotate), so that the roller 3 rolls or slides to the far end 212 of the eccentric arc surface 21 from the near end of the eccentric arc surface 21, and finally the roller 3 is tightly pressed between the eccentric arc surface 21 at the far end 212 and the internal spline tooth groove 91 by the rotating eccentric arc surface 21, so that the internal spline gear to be processed is radially expanded and fixed on the cam 2.
The following is a further improvement.
As shown in fig. 9, the rollers 3 are cylindrical screws having axial through holes 31. The purpose is to make it have certain bending elasticity, have better adaptability to the contact surface when expanding tightly, and simultaneously can not produce positioning error because of deformation and bending like the rigid roller.
As shown in fig. 8, 9 and 10, the tooth grinding fixture further comprises a holder 4, a collar 41 is arranged on the holder 4, the collar 41 is sleeved on the mandrel 1 below the cam 2, a string rod 42 extending to the periphery of the cam 2 is arranged below the collar 41 facing the cam 2, and the roller 3 is sleeved on the string rod 42. By the arrangement, a plurality of rollers 3 can be placed on one frame body, and all the rollers 3 can be simultaneously inserted between the eccentric arc surface 21 and the internal spline tooth groove 91 during clamping.
As shown in fig. 8 and 9, a space is provided between the inner wall of the axial through hole 31 of the roller 3 and the outer peripheral surface of the roller 3. The advantage of this arrangement is that the rollers 3 can be pushed between the eccentric arc 21 and the female spline groove 91 by the rotating eccentric arc 21 without moving the skewer 42 on the holder.
As shown in fig. 5 and 6, the number of the eccentric arc surfaces 21 arranged on the periphery of the cam 2 is 3 or 4, and the diameters of all the rollers 3 are equal. The arrangement is to reduce the number of the eccentric arc surfaces 21 as much as possible, and to make the radial stress points of the fastened internal spline gear distributed as uniform as possible, the diameters of all the rollers 3 are equal, and the arrangement is an optimal arrangement for ensuring that the axial core line of the internal spline hole is highly overlapped with the axial core line of the mandrel 1 by taking further measures.
For the gear to be processed with the internal spline tooth number evenly divided by the number of the eccentric arc surfaces 21 on the periphery of the cam, the eccentric arc surfaces 21 on the periphery of the cam 2 are arranged in equal radian and equal arc length, and the circumferential intervals of the adjacent eccentric arc surfaces 21 on the periphery of the cam 2 are equal. As described in the foregoing method, this is a very ideal situation in practical applications, and each eccentric arc surface 21 can radially outwardly correspond to the same number of internal spline tooth grooves 91, and in this situation, the above arrangement can ensure that the axial core line of the internal spline hole has extremely high coaxiality with the axial core line of the mandrel 1 after clamping.
As shown in fig. 7, for the gear to be processed, the number of teeth of which is not exactly divisible by the number of eccentric arc surfaces 21 on the outer periphery of the cam, a non-equal-division eccentric arc surface 24 is arranged in the eccentric arc surfaces 21 on the outer periphery of the cam 2; the non-equally divided eccentric arc surface 24 can correspond to one more tooth groove 91 or one less tooth groove 91 radially outward than the other eccentric arc surfaces 21, and when the other eccentric arc surfaces 21 have a position where the roller 3 can be clamped between the corresponding spline tooth groove 91, the non-equally divided eccentric arc surface 24 also has a position where the roller 3 is clamped between the corresponding spline tooth groove 91. This is also explained in the above method, when the number of eccentric arc surfaces on the cam 2 can be selected to be 3 or 4, only one non-equally divided eccentric arc surface 24 radially outwardly corresponds to one more female spline groove 91 or one less female spline groove 91, and the other eccentric arc surfaces can correspond to the same number of grooves 91. Such a gear to be machined, in which the number of teeth of the internal spline is not divisible by the number of eccentric arc surfaces 21 provided on the outer periphery of the cam, is also encountered in practical applications, and the above arrangement is suitable for such a situation. Through setting up like this, can carry out quick, the high centering fastening of axiality to the gear of treating that can not be exactly divided by cam periphery eccentric cambered surface 21 number, only need debug the processing to non-equant eccentric cambered surface 24 when making the cam to when realizing that other eccentric cambered surfaces 21 have a position and press from both sides tight roller 3 between the spline tooth socket 91 that corresponds, non-equant eccentric cambered surface 24 also has a position and presss from both sides tight roller 3 between the corresponding spline tooth socket 91.
As shown in fig. 2, a positioning ring 5 is sleeved on the mandrel 1 below the cam 2, a first positioning hole 51 is radially arranged on the positioning ring 5 and corresponds to the first positioning hole 51, a second positioning hole 52 is arranged on the mandrel 1, the aperture of the second positioning hole 52 is larger than that of the first positioning hole 51, a soft sleeve 53 is sleeved in the second positioning hole 52, and a fastening pin 54 is driven into the first positioning hole 51 and the soft sleeve 53. The positioning ring is not designed with the mandrel into a whole, and the positioning ring and the mandrel are considered from the manufacturability (grinding or linear cutting) of processing the curved surface of the cam during tool manufacturing, can be processed by separation, is designed into a whole, does not have a proper processing method at present, and is convenient to replace the positioning rings with different outer diameters according to different outer diameters of products. The positioning ring 5 and the mandrel 1 are fastened through the positioning pin 54, the soft pin 53 is arranged in the middle, and because two hard entities are difficult to match drilling and hinge, the soft pin 53 is driven into the mandrel in advance, then the hole of the positioning ring is used as a drilling jig to match drilling and hinge a pin hole, and then the positioning pin 54 is driven into the hole, so that firm and accurate positioning can be realized.
As shown in fig. 3, the mandrel 1 is integrally formed with the cam 2. This is a preferred simple arrangement, which is particularly necessary when the difference between the diameter of the cam 2 and the diameter of the mandrel is small.
The above-described embodiments are intended to illustrate the invention more clearly and should not be construed as limiting the scope of the invention covered thereby, any modification of the equivalent should be considered as falling within the scope of the invention covered thereby.
Claims (10)
1. A centering and fastening method for the gear grinding of an internal spline gear is characterized in that a cam (2) with a plurality of eccentric cambered surfaces (21) is sleeved on a mandrel (1), and when the mandrel is clamped, the gear to be ground with the internal spline is sleeved on the cam (2), when the cam (2) rotates in the internal spline hole, the distance between any point of the internal spline and the eccentric cambered surface (21) can be reduced from large to small, an intermediate part is arranged between the spline and the eccentric cambered surface (21), the cam (2) is rotated to enable the eccentric cambered surface (21) to radially and outwards push the intermediate part, when the cam (2) can not rotate in the inner spline hole, all the intermediate parts are pressed between the inner spline and the eccentric cambered surface (21), thereby realizing the radial fastening of the gear to be ground with the internal spline on the periphery of the cam (2), and the designed axial lead of the internal spline hole of the clamped gear to be ground is ensured to coincide with the axial lead of the mandrel (1).
2. The centering fastening method for internal spline gear grinding as claimed in claim 1, wherein: the middle part is set to be a cylindrical roller (3), the roller (3) is inserted between the tooth groove (91) and the eccentric arc surface (21) at the maximum distance between the eccentric arc surface (21) of the cam and the internal spline tooth groove (91) during clamping, the cam (2) is rotated during clamping, the roller (3) is gradually pressed towards the inside of the tooth groove (91) by the eccentric arc surface (21), and when the cam (2) cannot rotate in the internal spline hole, radial fastening of a gear to be ground with the internal spline is achieved.
3. The centering fastening method for internal spline gear grinding as claimed in claim 2, wherein: the roller (3) is made into an elastic body capable of bending.
4. The centering fastening method for internal spline gear grinding as claimed in claim 2, wherein: the roller (3) is made into a tubular body with a through hole (31) along the axis, the roller (3) is sleeved on the string rod (42), and one end of the string rod (42) is fixed on a frame body; the diameter of the through hole (31) is larger than that of the string rod (42), so that the roller (3) can be pushed by the inner spline tooth groove (91) of the eccentric arc surface (21) radially outward of the cam when the string rod (42) is fixed.
5. The centering fastening method for internal spline gear grinding as claimed in claims 2 to 4, wherein: the number of eccentric cambered surfaces (21) arranged on the periphery of the cam (2) is selected to be 3 or 4, so that the diameters of all the rollers (3) are equal; for the gear to be processed with the number of teeth of the internal spline capable of being divided by the number of the eccentric arc surfaces (21) on the periphery of the cam, the eccentric arc surfaces (21) on the periphery of the cam (2) are arranged in an equal radian and an equal arc length mode, and the circumferential intervals of the adjacent eccentric arc surfaces (21) on the periphery of the cam (2) are equal.
6. The centering fastening method for internal spline gear grinding as claimed in claims 2 to 4, wherein: the number of eccentric cambered surfaces (21) arranged on the periphery of the cam (2) is selected to be 3 or 4, so that the diameters of all the rollers (3) are equal, for the gear to be processed with the number of teeth of the internal spline incapable of being divided by the number of eccentric cambered surfaces (21) on the periphery of the cam, one eccentric arc surface (21) is selected as a non-equal division eccentric arc surface (24) from the eccentric arc surfaces (21) on the periphery of the cam (2), the arc length and the arc degree of the non-equal division eccentric arc surface (24) are adjusted during setting, so that the non-equal division eccentric arc surface (24) can be radially outwards more corresponding to one internal spline tooth groove (91) or less corresponding to one internal spline tooth groove (91) compared with other eccentric arc surfaces (21), when other eccentric arc surfaces (21) have a position to clamp the roller (3) between the corresponding internal spline tooth groove (91), so that the non-equally divided eccentric arc surface (24) also has a position for clamping the roller (3) between the corresponding internal spline tooth groove (91).
7. A centering and fastening jig for internal spline gear grinding designed according to the method of claim 1, comprising a mandrel (1), characterized in that: the device also comprises a cam (2) and a roller (3); the cam (2) is sleeved on the mandrel (1), a plurality of eccentric arc surfaces (21) are arranged on the outer peripheral surface of the cam (2), during clamping, the cam (2) is located in an internal spline hole of an internal spline gear to be machined, and each eccentric arc surface (21) is provided with a roller (3) located between the eccentric arc surface (21) and a tooth groove (91) of the internal spline.
8. The centering fastening jig for use in internal spline gear grinding work according to claim 7, characterized in that: one end of an eccentric cambered surface (21) at the periphery of the cam (2) is a near end (211) close to the axial lead of the mandrel (1), and the other end of the eccentric cambered surface is a far end (212) far away from the axial lead of the mandrel (1); a connecting surface (23) is arranged between two adjacent eccentric arc surfaces (21), one end of the connecting surface (23) is intersected with the telecentric end (212) of one eccentric arc surface (21), and the other end of the connecting surface (23) is intersected with the proximal end (211) of one eccentric arc surface (21).
9. The centering fastening jig for use in internal spline gear grinding work according to claim 7, characterized in that: the roller (3) is a columnar spiral body with an axial through hole (31).
10. The centering fastening jig for use in internal spline gear grinding work according to claim 9, characterized in that: the gear grinding clamp further comprises a retainer (4), a sleeve ring (41) is arranged on the retainer (4), the sleeve ring (41) is sleeved on the mandrel (1) above the cam (2), a string rod (42) extending to the periphery of the cam (2) is arranged below the sleeve ring (41) facing the cam (2), and the roller (3) is sleeved on the string rod (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011094971.9A CN112170985A (en) | 2020-10-14 | 2020-10-14 | Centering fastening method and clamp for internal spline gear grinding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011094971.9A CN112170985A (en) | 2020-10-14 | 2020-10-14 | Centering fastening method and clamp for internal spline gear grinding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112170985A true CN112170985A (en) | 2021-01-05 |
Family
ID=73949902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011094971.9A Pending CN112170985A (en) | 2020-10-14 | 2020-10-14 | Centering fastening method and clamp for internal spline gear grinding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112170985A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114101362A (en) * | 2021-10-22 | 2022-03-01 | 山东大学 | Aluminum alloy part extrusion die device |
-
2020
- 2020-10-14 CN CN202011094971.9A patent/CN112170985A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114101362A (en) * | 2021-10-22 | 2022-03-01 | 山东大学 | Aluminum alloy part extrusion die device |
| CN114101362B (en) * | 2021-10-22 | 2022-09-13 | 山东大学 | Aluminum alloy part extrusion die device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2774539B2 (en) | Coupling device | |
| US3420537A (en) | Workholder and expansible collet therefor | |
| CN112170985A (en) | Centering fastening method and clamp for internal spline gear grinding | |
| US20130239400A1 (en) | Method of Manufacturing Continuously Variable Transmission Variator Component and Chuck Apparatus for Manufacturing Variator Component | |
| CN212822770U (en) | Hydraulic chuck for machine tool | |
| CN212682704U (en) | Centering fastening clamp for internal spline gear grinding machining | |
| CN108818089A (en) | A kind of two sides hole workpiece positioning fixture | |
| CN201006576Y (en) | Mandrel used for locating axle sleeve-like workpieces | |
| CN210334401U (en) | Lathe combined clamp for machining workpiece with local cylindrical surface | |
| CN104842020B (en) | The fixture of clamping cylindrical straight gear involute spline holes gear | |
| CN210475592U (en) | Inner hole positioning workpiece and expanding device | |
| ES2165983T3 (en) | PROCEDURE FOR THE FORMATION OF A SECTIONED AND REBORDED SECTION IN A CYLINDRICAL HOLE BODY AND DEVICE FOR THE PERFORMANCE OF THE PROCEDURE. | |
| US20080088073A1 (en) | Hydromechanical Clamping Device With Hydraulically Operated Expanding Means | |
| CN106914734B (en) | Processing technology of spline gear long shaft | |
| CN109079168B (en) | Crankshaft machining device and machining method | |
| KR20220128380A (en) | conveying machine | |
| CN204053147U (en) | Machine tool center device and use the lathe of this Finial device | |
| CN111496675A (en) | Transmission output shaft internal grinding clamp | |
| CN216576765U (en) | Clamp for processing outer groove and chamfer of sliding sleeve | |
| CN104384544A (en) | Centering fixture | |
| CN103302328A (en) | Taper sleeve expansion type inner circle positioning device | |
| CN110369750A (en) | A kind of thin-walled brass cam path machining special fixture | |
| TWM454265U (en) | Synchronous guiding mechanism of CNC Swiss-type automatic lathe | |
| CN219402677U (en) | Gear sleeve machining clamp | |
| CN220560097U (en) | Spline forming device for transmission shaft |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |