CN110625407B - Automatic centering clamping device for hollow rotating member - Google Patents
Automatic centering clamping device for hollow rotating member Download PDFInfo
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- CN110625407B CN110625407B CN201810642479.7A CN201810642479A CN110625407B CN 110625407 B CN110625407 B CN 110625407B CN 201810642479 A CN201810642479 A CN 201810642479A CN 110625407 B CN110625407 B CN 110625407B
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- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 14
- 238000003754 machining Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 230000005489 elastic deformation Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
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- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
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- 238000003801 milling Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 239000000758 substrate Substances 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
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- 239000010935 stainless steel Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
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Abstract
The invention provides an automatic centering and clamping device for a hollow rotating member, which comprises a base, a centering assembly, a clamping assembly, a fixing assembly and a stop lever, wherein the centering assembly comprises a centering base body and a circumferential outer cone, the circumferential outer cone is provided with an inner hole, the centering assembly is matched with the outer circumferential surface of the hollow rotating member through the inner hole, the clamping assembly comprises a clamping base body and a circumferential inner cone, the circumferential inner cone is matched with the circumferential outer cone to clamp and fix the outer circumferential surface of the hollow rotating member, the fixing assembly comprises a fixing rod piece and a pressing head, the pressing head is used for clamping and fixing the end surface of the hollow rotating member to limit the movement of the hollow rotating member along the axial direction of the hollow rotating member, and the stop lever is matched with the hollow rotating member to limit the rotation of the hollow rotating member around the axial direction of the hollow rotating member. By applying the technical scheme of the invention, the technical problems of long time consumption and low processing efficiency of product positioning, aligning and clamping in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of precision machining, in particular to an automatic centering and clamping device for a hollow rotating member.
Background
In the field of machining, the parts must be placed in a jig before they are machined, so that they can be positioned and oriented in the correct position and orientation, and so that they can be maintained in the correct position and orientation despite the influence of cutting forces and other external forces during machining. The process of positioning and clamping a workpiece on a machine tool or in a clamp is called clamping. The clamping is divided into positioning and clamping, wherein the positioning refers to the process of determining that a workpiece has a correct position on a machine tool or in a clamp; clamping refers to the operation of fixing a workpiece after the workpiece is positioned so that the workpiece keeps the positioning position unchanged in the machining process. The common positioning methods in the prior art mainly include a positioning method using a workpiece plane as a positioning reference, a positioning method using an outer cylindrical surface of a workpiece as a positioning reference, a positioning method using a workpiece circular hole as a positioning reference, and the like. When the outer cylindrical surface of the workpiece is used as a positioning reference, the outer cylindrical surface is usually installed in a circular hole, a semicircular hole, a V-shaped block or a centering and clamping mechanism (such as a three-jaw chuck). In addition, in the process of clamping the workpiece, the size of the production batch of the workpiece needs to be considered, the small-batch products allow single-piece positioning and aligning clamping, and if the large-batch products still use the positioning and aligning clamping to perform the positioning and clamping of the parts, the non-cutting time of a machine tool can be greatly prolonged, and the processing efficiency of the products is reduced.
Disclosure of Invention
The invention provides an automatic centering and clamping device for a hollow rotating member, which can solve the technical problems of long time consumption and low processing efficiency of product positioning, aligning and clamping in the prior art.
The invention provides an automatic centering and clamping device for a hollow rotating member, which comprises: a base; the centering assembly comprises a centering base body and a circumferential outer cone, the centering base body is respectively connected with the base and the circumferential outer cone, the circumferential outer cone is provided with an inner hole, and the centering assembly is matched with the outer circumferential surface of the hollow rotating member through the inner hole; the clamping assembly comprises a clamping base body and a circumferential inner cone, and the circumferential inner cone is matched with the circumferential outer cone to clamp and fix the outer circumferential surface of the hollow rotating member; the fixing assembly comprises a fixing rod piece and a pressing head, the fixing rod piece is arranged on the clamping base body, the pressing head is movably arranged on the fixing rod piece, the fixing rod piece is arranged in the hollow rotating piece in a penetrating mode, and the pressing head is used for clamping and fixing the end face of the hollow rotating piece so as to limit the hollow rotating piece to move along the axial direction of the hollow rotating piece; and the stop lever is arranged on the centering base body and is matched with the hollow rotating part to limit the hollow rotating part to rotate around the axis direction of the hollow rotating part.
Further, the circumferential outer cone has a plurality of cutting grooves which are evenly distributed along the circumference of the circumferential outer cone.
Further, the automatic centering and clamping device also comprises a guide piece, wherein the guide piece is arranged on the centering base body along the radial direction of the circumferential outer cone; the clamping assembly is provided with a guide groove, the guide groove is arranged on the outer peripheral surface of the clamping assembly along the axial direction of the circumferential inner cone, and the guide piece is installed in a matched mode with the guide groove.
Further, the automatic centering and clamping device comprises a plurality of guide pieces, and the guide pieces are uniformly arranged at intervals along the circumferential direction of the centering base body; the clamping assembly is provided with a plurality of guide grooves, the guide grooves are uniformly arranged along the circumferential direction of the clamping assembly at intervals, and the guide pieces and the guide grooves are arranged in a one-to-one correspondence manner.
Further, clamping component still includes a plurality of spacing portions, and a plurality of spacing portions set up with a plurality of guide ways one-to-one, and spacing portion is used for spacing the removal of guide along the guide way.
Further, the clamping assembly is provided with a plurality of lightening holes, and the lightening holes are uniformly arranged on the clamping base body at intervals.
Furthermore, the fixing rod piece is a double-end stud, one end of the double-end stud is arranged on the clamping base body, the pressing head is arranged at the other end of the double-end stud, and the pressing head is used for pressing and fixing the end face of the hollow rotary part.
Furthermore, the fixing assembly further comprises a first nut and a second nut, the first nut is matched with one end of the double-end stud to fixedly arrange one end of the double-end stud on the clamping base body, and the second nut is matched with the other end of the double-end stud to enable the pressing head to tightly press the end face of the fixed hollow rotating part.
Further, the centering assembly and the clamping assembly are both made of brass.
Furthermore, the automatic centering and clamping device further comprises a plurality of fastening screws, the fastening screws are evenly distributed along the circumferential direction of the base, and the base is fixedly connected with the centering base body through the fastening screws.
By applying the technical scheme of the invention, the inner conical surface of the circumferential inner cone is matched with the outer conical surface of the circumferential outer cone, so that the circumferential outer cone is stressed and generates micro elastic deformation to automatically center and clamp the outer circumferential surface of the hollow rotating member. Moreover, in the process of clamping and positioning the hollow rotating member, the circumferential inner cone and the circumferential outer cone are matched to clamp and fix the outer circumferential surface of the hollow rotating member, the pressing head can clamp and fix the end surface of the hollow rotating member to limit the hollow rotating member to move along the axis direction of the hollow rotating member, and the stop lever and the hollow rotating member are matched to limit the hollow rotating member to rotate around the axis direction of the hollow rotating member.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural view of a self-centering clamping device for a hollow rotating member according to an embodiment of the present invention;
FIG. 2 illustrates a schematic structural diagram of a base provided in accordance with an embodiment of the present invention;
FIG. 3 shows a cross-sectional view of the base provided in FIG. 2;
FIG. 4 illustrates a schematic structural view of a centering assembly provided in accordance with a specific embodiment of the present invention;
FIG. 5 shows a cross-sectional view of the centering assembly provided in FIG. 4;
FIG. 6 illustrates a schematic structural view of a clamping assembly provided in accordance with a specific embodiment of the present invention;
FIG. 7 shows a cross-sectional view of the clamping assembly provided in FIG. 6;
fig. 8 shows a schematic structural view of a compaction head provided according to a specific embodiment of the invention;
FIG. 9 illustrates a top view of a hollow rotating member provided in accordance with an exemplary embodiment of the present invention;
FIG. 10 shows a cross-sectional view of the hollow rotating member provided in FIG. 9;
fig. 11 shows a schematic structural diagram of positioning and clamping a hollow rotating member by using a self-centering clamping device according to an embodiment of the invention.
Wherein the figures include the following reference numerals:
10. a base; 20. a centering assembly; 21. centering the substrate; 22. a circumferential outer cone; 221. grooving; 222. a guide receiving hole; 30. a clamping assembly; 30a, a guide groove; 30b, lightening holes; 31. clamping the substrate; 32. a circumferential inner cone; 33. a limiting part; 40. a fixing assembly; 41. fixing the rod piece; 42. a compression head; 43. a first nut; 44. a second nut; 50. a stop lever; 60. a guide member; 70. fastening screws; 100. a hollow rotating member.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1 to 10, according to an embodiment of the present invention, there is provided an automatic centering and clamping device for a hollow rotating member, the automatic centering and clamping device including a base 10, a centering assembly 20, a clamping assembly 30, a fixing assembly 40, and a stopper 50, the centering assembly 20 including a centering base 21 and a circumferential outer cone 22, the centering base 21 being connected to the base 10 and the circumferential outer cone 22, respectively, the circumferential outer cone 22 having an inner hole, the centering assembly 20 being engaged with an outer circumferential surface of the hollow rotating member through the inner hole, the clamping assembly 30 including a clamping base 31 and a circumferential inner cone 32, the circumferential inner cone 32 being engaged with the circumferential outer cone 22 to clamp the outer circumferential surface of the hollow rotating member, the fixing assembly 40 including a fixing rod 41 and a pressing head 42, the fixing rod 41 being disposed on the clamping base 31, the pressing head 42 being movably disposed on the fixing rod 41, the fixed rod piece 41 penetrates through the hollow rotating piece, the pressing head 42 is used for clamping and fixing the end face of the hollow rotating piece so as to limit the movement of the hollow rotating piece along the axial direction of the hollow rotating piece, the stop lever 50 is arranged on the centering base body 21, and the stop lever 50 is matched with the hollow rotating piece so as to limit the rotation of the hollow rotating piece around the axial direction of the hollow rotating piece.
By applying the configuration mode, the inner conical surface of the circumferential inner cone 32 is matched with the outer conical surface of the circumferential outer cone 22, so that the circumferential outer cone 22 is stressed and generates micro elastic deformation to automatically center and clamp the outer circumferential surface of the hollow rotating member. Furthermore, in the process of clamping and positioning the hollow rotating member, the circumferential inner cone 32 and the circumferential outer cone 22 are matched to clamp and fix the outer circumferential surface of the hollow rotating member, the pressing head 42 can clamp and fix the end surface of the hollow rotating member to limit the movement of the hollow rotating member along the axis direction of the hollow rotating member, and the stop lever 50 is matched with the hollow rotating member to limit the rotation of the hollow rotating member around the axis direction of the hollow rotating member.
Further, in the present invention, in order to achieve the forced elastic deformation of the circumferential outer cone, the circumferential outer cone 22 may be configured to have a plurality of cutting grooves 221, and the plurality of cutting grooves 221 are uniformly distributed along the circumferential direction of the circumferential outer cone 22.
By applying the configuration mode, the plurality of cutting grooves 221 are uniformly arranged on the circumference of the circumference outer cone 22 at intervals to divide the circumference outer cone 22 into a thin-walled ring and a plurality of connecting sheets, the plurality of connecting sheets are uniformly arranged on the thin-walled ring at intervals, the hollow rotary member 100 is placed in the inner hole of the centering assembly 20 in the process of positioning and clamping the hollow rotary member, the initial matching state of the outer circumference surface of the hollow rotary member 100 and the inner hole is in clearance fit, the plurality of connecting sheets of the circumference outer cone 22 are stressed to generate elastic deformation and are extruded into the plurality of cutting grooves 221 in the process of matching the circumference inner cone 32 and the circumference outer cone 22, the groove intervals of the cutting grooves 221 are gradually reduced, and the plurality of connecting sheets jointly act to clamp and fix the outer circumference surface of the hollow rotary member 100.
As an embodiment of the present invention, the centering assembly 20 is a circular ring structure, the centering base 21 is disposed outside the circumferential outer cone 22, the centering base 21 is connected to the base 10 and the circumferential outer cone 22, respectively, the circumferential outer cone 22 has an inner hole, and the centering assembly 20 is engaged with the outer circumferential surface of the hollow rotating body 100 through the inner hole. 4-6 cutting grooves 221 are uniformly distributed on the circumference of the circumferential outer cone 22, the taper angle of the circumferential outer cone 22 is 40 degrees +/-5', the plurality of cutting grooves 221 are uniformly arranged on the circumference of the circumferential outer cone 22 at intervals to divide the circumferential outer cone 22 into a thin-wall ring and a plurality of connecting sheets, the wall thickness of the thin-wall ring is adjusted according to the size of a positioning journal of the hollow rotary member 100, and equidistant micro elastic deformation (0.01 mm-0.05 mm) of the plurality of connecting sheets of the circumferential outer cone 22 along the radial direction of the hollow rotary member 100 can be realized. The inner hole of the centering component 20 is a high-precision hole, which forms a small clearance fit with the excircle journal of the hollow rotating member 100 (the clearance is adjusted to be 0.005mm to 0.015mm according to the finish machining of general precision parts according to the machining precision requirement). Further, in the present invention, in order to secure the hole diameter accuracy and the surface quality of the inner hole of the centering assembly 20, it is necessary to perform the finishing of the inner hole after completing the machining of the plurality of cutting grooves 221 on the circumferential outer cone 22.
Further, in the present invention, in order to achieve the motion guiding effect of the clamping assembly 30 so as to enable the rapid replacement machining of the workpiece, the self-centering clamping device may be configured to further include a guide member 60, the guide member 60 being disposed on the centering base 21 in the radial direction of the circumferential outer cone 22; the clamping assembly 30 has a guide groove 30a, the guide groove 30a is provided on the outer circumferential surface of the clamping assembly 30 in the axial direction of the circumferential inner cone 32, and the guide 60 is fitted with the guide groove 30 a.
Further, in the present invention, in order to further increase the motion guiding effect on the clamping assembly 30, the self-centering clamping device may be configured to further include a plurality of guides 60, the plurality of guides 60 being uniformly spaced along the circumferential direction of the centering base 21; the clamping assembly 30 has a plurality of guide grooves 30a, the plurality of guide grooves 30a are uniformly spaced along the circumferential direction of the clamping assembly 30, and the plurality of guide members 60 are disposed in one-to-one correspondence with the plurality of guide grooves 30 a.
As an embodiment of the present invention, the clamping assembly 30 is a circular ring structure, on which a circumferential inner cone 32 is machined to match the centering assembly 20, the cone angle of the circumferential inner cone 32 is 40 ° ± 5', and the circumferential inner cone 32 can realize a complete circle holding of the outer cone of the circumferential outer cone 22 of the centering assembly 20. Four guide receiving holes 222 are uniformly formed in the outer circumferential side surface of the centering base 21, the guide receiving holes 222 have a threaded through hole structure, socket cap head screws are used as the guide members 60, and the four socket cap head screws are respectively mounted in the four guide receiving holes 222. Four guide grooves 30a are uniformly formed in the side wall of the outer circumference of the clamping assembly 30, and four socket head cap screws screwed into the outer circumference of the centering assembly 20 are respectively clamped into the four guide grooves 30a, so that the vertical guide function can be achieved in the vertical movement process of the clamping assembly 30, and the circumferential rotation of the clamping assembly 30 is prevented.
Further, in the present invention, in order to prevent the clamping assembly 30 from falling down during the up-and-down movement, the clamping assembly 30 may be configured to further include a plurality of limiting portions 33, the plurality of limiting portions 33 are disposed in one-to-one correspondence with the plurality of guide grooves 30a, and the limiting portions 33 are used for limiting the movement of the guide 60 along the guide grooves 30 a.
As an embodiment of the present invention, the clamping assembly 30 includes four limiting portions 33, the four limiting portions 33 are respectively disposed in one-to-one correspondence with the four guide grooves 30a, and the limiting portions 33 can limit the movement of the guide member 60 along the guide grooves 30a during the vertical movement of the clamping assembly 30, so as to prevent the clamping assembly 30 from falling.
In order to reduce the overall weight of the self-centering clamping device to improve the operability, the clamping assembly 30 may be configured to have a plurality of lightening holes 30b, and the plurality of lightening holes 30b are uniformly spaced on the clamping base 31. As one embodiment of the present invention, the number of the lightening holes 30b is four, and the four lightening holes 30b are uniformly arranged along the circumference of the clamping base body 31.
Further, in the present invention, in order to restrict the movement of the hollow rotary member 100 in the axial direction thereof, the fixing rod 41 may be configured as a stud, one end of which is provided on the clamp base 31, and the pressing head 42 is provided at the other end of which the pressing head 42 is used to press and fix the end surface of the hollow rotary member 100. The fixing assembly 40 further includes a first nut 43 and a second nut 44, the first nut 43 cooperating with one end of the stud to fixedly dispose one end of the stud on the clamping base 31, and the second nut 44 cooperating with the other end of the stud to cause the pressing head 42 to press against the end surface of the fixed hollow rotating member.
As an embodiment of the present invention, the clamping base 31 is provided at the center thereof with a threaded through hole for mounting one end of the stud bolt, and a hexagon nut is used as the first nut 43, which is engaged with one end of the stud bolt to fixedly set the one end of the stud bolt on the clamping base 31. A hexagonal flange nut is adopted as the second nut 44, and the pressing head 42 is used at the top end of the hollow rotating member 100 and the other end of the stud bolt is screwed through the hexagonal flange nut, so that the axial clamping and fixing of the hollow rotating member 100 are ensured.
Further, in the present invention, in order to improve the life span and the repeated positioning accuracy of the self-centering clamping device, the materials of the centering assembly 20 and the clamping assembly 30 may be configured as brass. With this arrangement, since the brass material has a low elastic modulus and high wear resistance, the material of the centering unit 20 and the material of the clamping unit 30 are both made of brass, so that the life span and the repeated positioning accuracy of the self-centering clamping device can be improved.
In the present invention, in order to achieve the fixed connection of the base 10 and the centering assembly 20, the self-centering clamping device may be configured to further include a plurality of fastening screws 70, the plurality of fastening screws 70 are uniformly distributed along the circumferential direction of the base 10, and the base 10 is fixedly connected with the centering base 21 through the plurality of fastening screws 70.
As an embodiment of the present invention, the base 10 is a base plate and a foundation of the entire self-centering clamping device, which is mounted on a machine tool table, and there is no requirement for the outer contour of the base 10, and it may be circular, square, etc., and furthermore, a socket head cap screw may be used as the fastening screw 70. Four step through holes are uniformly distributed on the same circle of the axial single side surface of the base 10 and used for mounting hexagon socket head cap screws. On the outside circumference of the axial terminal surface of centering base member 21, the design has four screw thread blind hole structures with base 10 complex, through four hexagon socket head cap screws with centering base member 21 fixed mounting on base 10.
In the self-centering clamping device of the present invention, the centering assembly 20 and the clamping assembly 30 are core parts, the centering assembly 20 and the clamping assembly 30 are both made of brass material, and other parts may be made of stainless steel material. The centering matrix 21 is fixedly connected with the base 10, the circumferential outer cone 22 is matched with the circumferential inner cone 32 in structure, and the clamping assembly 30 is axially and circumferentially limited by four hexagon socket head cap screws on the outer circle side surface of the centering matrix 21. After the hollow rotating member 100 is installed on the centering assembly 20, the second nut 44 is screwed, the clamping assembly 30 is lifted axially and vertically, the circumferential inner cone 32 of the clamping assembly 30 pushes the thin-walled annular structure of the circumferential outer cone 22 of the centering assembly 20 upwards, so that a small amount of elastic shrinkage is generated, and the outer cylindrical surface of the hollow rotating member 100 is clamped in a self-centering manner, so that the self-centering clamping function of the workpiece is realized. When the second nut 44 is loosened, the clamping assembly 30 falls freely due to its own weight, the engagement between the outer conical surface of the circumferential outer cone 22 and the inner conical surface of the circumferential inner cone 32 disappears, the thin-walled annular structure of the circumferential outer cone 22 of the centering assembly 20 is elastically deformed and restored, and the clamped hollow rotary member 100 is automatically loosened. The clamping assembly 30 further falls down, and the four hexagon socket head cap screws on the outer side surface of the circumference of the centering assembly 20 clamp the limiting part 33 so as to limit the clamping assembly 30 and prevent the clamping assembly 30 from falling.
Specifically, when the self-centering clamping device of the present invention is used to perform the centering clamping operation of the hollow rotary member 100, the base 10 and the centering assembly 20 are first screwed and fixed by four socket head cap screws. One end of the stud is screwed into the clamping base 31, the stud is screwed and fixed on the back of the clamping base 31 by using a hexagon nut, the clamping assembly 30 is installed from the installation side of the base 10, four socket cap screws are screwed into the outer circumferential side of the centering assembly 20, and the clamping assembly 30 is rotated so that the four guide grooves 30a on the outer circumferential side are clamped into the socket cap screws. Then, the centering device is installed on a machine tool workbench, a dial indicator is installed on a machine tool spindle, the dial indicator is printed and the automatic centering clamping device is adjusted, so that an inner hole of the centering assembly 20 is perpendicular to the machine tool workbench, then the automatic centering clamping device is fixed, the relative position of the machine tool spindle and the centering clamping device is adjusted, the center of the inner hole of the centering assembly 20 is printed and aligned within 0.005mm-0.01mm, and at the moment, the accurate position of the centering device under a machine tool coordinate system is determined.
Finally, the workpiece to be machined is installed in the inner hole of the centering assembly 20, and the pressing head 42 and the hexagonal flange nut are installed on the top surface of the workpiece. Screwing the hexagonal flange face nut, and slowly moving the clamping assembly 30 upwards; further, the inner conical surface of the circumferential inner cone 32 is in contact with the outer conical surface of the circumferential outer cone 22; the hexagonal flange face nut is further screwed, the clamping assembly 30 moves upwards, the inner conical surface of the circumferential inner cone 32 pushes the outer conical surface of the circumferential outer cone 22, the thin-wall annular structure of the circumferential outer cone 22 generates elastic deformation and inwards, meanwhile, the circumference is shrunk radially in an equidistant and micro mode, and the machined workpiece is pushed to move in a micro mode in a radial mode; and with the final tightening of the hexagonal flange face nut, the machined workpiece is automatically centered and clamped simultaneously. The automatic centering and clamping device can quickly and efficiently realize centering and clamping of the hollow rotating part 100, and meets the efficient clamping requirement of mass production of parts of the type.
For a further understanding of the present invention, the operation of the self-centering clamping device of the present invention will be described in detail with reference to fig. 9 to 11.
As shown in fig. 9 and 10, a schematic structural diagram of a precision structural member of a rocker arm output shaft (hereinafter, collectively referred to as an output shaft) is provided according to an embodiment of the present invention. The rocker arm output shaft is made of alloy structural steel, and the hardness of the rocker arm output shaft is HRC 38-42. As can be seen from fig. 9 and 10, the structural member has high machining accuracy, the profile to be machined is an outer annular surface with a diameter of 50mm, and the outer annular surface cannot be machined by turning due to the existence of the rocker arm structure, and can only be machined by milling along the outer annular surface of the output shaft by using an end mill. Meanwhile, the design standard of the circumference (non-whole circumference) to be processed is phi 55mm of the bottom shaft diameter of the output shaft, the reference A in the drawing is taken as the processing standard according to the principle that the processing standard is consistent with the design standard, and considering that the workpiece is large in production batch and the single-piece alignment processing efficiency is too low, a high-efficiency positioning clamping tool needs to be designed and manufactured. If the inner hole of the workpiece is used as a processing standard, firstly, the processing precision of the inner hole needs to be improved, and the requirement of coaxiality with the A standard needs to be ensured, so that the processing cost is high; secondly, the inner hole positioning needs to be carried out by a mandrel, and due to the manufacturing reasons of the mandrel and the inner hole, a taper fit clearance exists along the axial direction of the output shaft on the matching surface of the mandrel and the inner hole, so that the repeated positioning precision is not high.
However, with the automatic centering and clamping device of the invention, as shown in fig. 11, a diamond pin is used as a stop lever 50, the output shaft is mounted on the automatic centering and clamping device, the reference a is matched with the inner hole of the centering component 20 in the device, the pin hole phi 6 on the output shaft is fixed with the centering component 20 on the device through the diamond pin, by screwing the hexagonal flange nut clockwise, the stud drives the clamping component 30 to move upwards, the inner conical surface of the inner circumferential cone 32 is matched with the outer conical surface of the outer circumferential cone 22, the thin-wall annular structure generates elastic deformation, the outer cylindrical surface reference a of the output shaft is centered automatically, the thin-wall annular structure surface of the outer circumferential cone 22 embraces the outer cylindrical surface reference a as the hexagonal flange nut is screwed further, meanwhile, the pressing head 42 presses the output shaft to limit the movement of the output shaft along the axial direction thereof, and the diamond pin limits the rotation of the output shaft around the axial direction thereof, therefore, the output shaft is positioned and clamped, and the outer cylindrical partial surface of the output shaft can be precisely milled.
In summary, the self-centering clamping device of the present invention has the following advantages over the prior art.
Firstly, the automatic centering and clamping device skillfully utilizes the fit of the inner and outer conical surfaces of the circumference, and the conical surface is axially pushed to promote the circumference of the thin-wall annular structure to be elastically deformed slightly at equal intervals, so that the principle of automatic centering and clamping is generated, the structure is simple, and the positioning and clamping are stable and reliable;
secondly, the centering assembly and the clamping assembly are made of brass, and the device can be used for a long time and has high repeated positioning precision by utilizing the inherent small elastic modulus and high wear resistance of brass materials;
thirdly, the guide piece on the outer circumferential side surface of the centering assembly can play a role in limiting and guiding the movement of the clamping assembly, so that the replacement and processing of the workpiece can be quickly realized;
fourthly, when the device is used for processing the batch rotating parts, the precise parts can be processed only by positioning and aligning the device under the machine tool coordinates, so that the device is convenient, time-saving, efficient and reliable;
fifthly, the device can be used on various machine tools, such as a common milling machine, a common boring machine and a numerical control machining center, and has strong universality.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
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 self-centering clamping device for a hollow rotating member, the self-centering clamping device comprising:
a base (10);
the centering assembly (20) comprises a centering base body (21) and a circumferential outer cone (22), the centering base body (21) is connected with the base (10) and the circumferential outer cone (22) respectively, the circumferential outer cone (22) is provided with an inner hole, and the centering assembly (20) is matched with the outer circumferential surface of the hollow rotary piece through the inner hole;
the clamping assembly (30) comprises a clamping base body (31) and a circumferential inner cone (32), and the circumferential inner cone (32) is matched with the circumferential outer cone (22) to clamp and fix the outer circumferential surface of the hollow rotating member;
the fixing assembly (40) comprises a fixing rod piece (41) and a pressing head (42), the fixing rod piece (41) is arranged on the clamping base body (31), the pressing head (42) is movably arranged on the fixing rod piece (41), the fixing rod piece (41) penetrates through the hollow rotary piece, and the pressing head (42) is used for clamping and fixing the end face of the hollow rotary piece so as to limit the movement of the hollow rotary piece along the axial direction of the hollow rotary piece;
the stop lever (50), stop lever (50) set up on centering base member (21), stop lever (50) with hollow rotating member cooperatees in order to restrict hollow rotating member is around the rotation of hollow rotating member's axis direction.
2. Self-centering gripping device according to claim 1, wherein the circumferential outer cone (22) has a plurality of cutting grooves (221), the plurality of cutting grooves (221) being evenly distributed along the circumference of the circumferential outer cone (22).
3. The self-centering gripping device according to claim 1 or 2, further comprising a guide (60), said guide (60) being arranged on said centering base (21) in a radial direction of said circumferential outer cone (22); the clamping assembly (30) is provided with a guide groove (30a), the guide groove (30a) is arranged on the outer peripheral surface of the clamping assembly (30) along the axial direction of the circumferential inner cone (32), and the guide piece (60) is installed in a matching mode with the guide groove (30 a).
4. The self-centering gripping device according to claim 3, characterized in that it comprises a plurality of said guides (60), a plurality of said guides (60) being arranged at even intervals along the circumference of said centering base (21); the clamping assembly (30) is provided with a plurality of guide grooves (30a), the guide grooves (30a) are uniformly arranged at intervals along the circumferential direction of the clamping assembly (30), and the guide pieces (60) and the guide grooves (30a) are arranged in a one-to-one correspondence mode.
5. The self-centering clamping device according to claim 4, wherein the clamping assembly (30) further comprises a plurality of limiting portions (33), the plurality of limiting portions (33) are arranged in one-to-one correspondence with the plurality of guide grooves (30a), and the limiting portions (33) are used for limiting the movement of the guide member (60) along the guide grooves (30 a).
6. The self-centering clamping device according to claim 1, wherein the clamping assembly (30) has a plurality of lightening holes (30b), the plurality of lightening holes (30b) being arranged on the clamping base body (31) at regular intervals.
7. The self-centering clamping device according to claim 1, wherein the fixing rod member (41) is a stud, one end of the stud is disposed on the clamping base body (31), the pressing head (42) is disposed at the other end of the stud, and the pressing head (42) is used for pressing and fixing the end face of the hollow rotating member.
8. The self-centering clamping device as claimed in claim 7, wherein said fixing assembly (40) further comprises a first nut (43) and a second nut (44), said first nut (43) cooperating with one end of said stud to fixedly set one end of said stud on said clamping base (31), said second nut (44) cooperating with the other end of said stud to cause said holding-down head (42) to hold down the end face of said hollow swivel.
9. Self-centering-clamping device according to claim 1, characterized in that the material of the centering assembly (20) and the clamping assembly (30) is brass.
10. The self-centering clamping device according to claim 1, further comprising a plurality of fastening screws (70), wherein the plurality of fastening screws (70) are uniformly distributed along the circumferential direction of the base (10), and the base (10) is fixedly connected with the centering base (21) through the plurality of fastening screws (70).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810642479.7A CN110625407B (en) | 2018-06-21 | 2018-06-21 | Automatic centering clamping device for hollow rotating member |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810642479.7A CN110625407B (en) | 2018-06-21 | 2018-06-21 | Automatic centering clamping device for hollow rotating member |
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| Publication Number | Publication Date |
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| CN110625407A CN110625407A (en) | 2019-12-31 |
| CN110625407B true CN110625407B (en) | 2021-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810642479.7A Active CN110625407B (en) | 2018-06-21 | 2018-06-21 | Automatic centering clamping device for hollow rotating member |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111829419B (en) * | 2020-06-22 | 2022-06-03 | 上海航天控制技术研究所 | Double-frame coaxial detection device |
| CN113787357B (en) * | 2021-08-16 | 2024-06-25 | 北京实验工厂有限责任公司 | Machining, positioning and clamping device and method for pin shaft hole system of cross shaft press-fitting assembly |
| CN116262306A (en) * | 2021-12-13 | 2023-06-16 | 航天科工惯性技术有限公司 | Clamping device and processing device for welding ultra-thin rotary components |
| CN114274090B (en) * | 2021-12-17 | 2023-05-23 | 哈尔滨玻璃钢研究院有限公司 | Built-in elastomer precise positioning and checking method and positioning and checking tool |
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| GB1343928A (en) * | 1970-05-30 | 1974-01-16 | Werkezeugmaschinenfabrik Adolf | Aligning device for workpieces on machine tool tables |
| CN2868538Y (en) * | 2005-10-28 | 2007-02-14 | 沈阳第一机床厂 | Composite clamp for working cylindrical thin-wall piece |
| CN201324955Y (en) * | 2008-11-04 | 2009-10-14 | 上海东方泵业(集团)有限公司 | Turning device |
| CN104057323A (en) * | 2014-06-25 | 2014-09-24 | 遵义长佳机械制造有限公司 | End face drilling tool |
| CN104551780A (en) * | 2014-12-12 | 2015-04-29 | 安徽白兔湖动力股份有限公司 | Air clamper for bore hole of thin-wall cylinder sleeve |
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| GB1343928A (en) * | 1970-05-30 | 1974-01-16 | Werkezeugmaschinenfabrik Adolf | Aligning device for workpieces on machine tool tables |
| CN2868538Y (en) * | 2005-10-28 | 2007-02-14 | 沈阳第一机床厂 | Composite clamp for working cylindrical thin-wall piece |
| CN201324955Y (en) * | 2008-11-04 | 2009-10-14 | 上海东方泵业(集团)有限公司 | Turning device |
| CN104057323A (en) * | 2014-06-25 | 2014-09-24 | 遵义长佳机械制造有限公司 | End face drilling tool |
| CN104551780A (en) * | 2014-12-12 | 2015-04-29 | 安徽白兔湖动力股份有限公司 | Air clamper for bore hole of thin-wall cylinder sleeve |
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| Publication number | Publication date |
|---|---|
| CN110625407A (en) | 2019-12-31 |
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