CN117086664A - C/C composite material plug cone convex surface machining clamp and machining method - Google Patents
C/C composite material plug cone convex surface machining clamp and machining method Download PDFInfo
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- CN117086664A CN117086664A CN202311272642.2A CN202311272642A CN117086664A CN 117086664 A CN117086664 A CN 117086664A CN 202311272642 A CN202311272642 A CN 202311272642A CN 117086664 A CN117086664 A CN 117086664A
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- plug
- plug cone
- supporting
- cone
- screw
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- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 238000003754 machining Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims description 16
- 238000003825 pressing Methods 0.000 claims abstract description 44
- 238000003801 milling Methods 0.000 claims abstract description 19
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000004323 axial length Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000003672 processing method Methods 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
Classifications
-
- 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
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
- B23Q3/065—Work-clamping means adapted for holding workpieces having a special form or being made from a special material for holding workpieces being specially deformable, e.g. made from thin-walled or elastic material
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The invention relates to a C/C composite material plug cone convexity processing clamp, which comprises a bottom plate and a supporting device for preliminarily supporting a plug cone piece; a clamping mechanism for fixing the end part of the plug cone is arranged at one axial end of the plug cone, and a pushing device for pushing the plug cone into a C-shaped clamping opening of the clamping mechanism is arranged at the other axial end of the plug cone; the outer convex curved surface of the plug cone piece is provided with a pressing device for pressing the plug cone piece on the supporting device; the device also comprises a balance supporting device for ensuring the circumferential balance of the plug cone, a supporting rod piece for preventing the plug cone from deforming, and a processing method for the plug cone by adopting the clamp. According to the invention, the rough milling and finish milling of the convex surface, the outer side surface and the top surface of the plug cone part are completed by clamping the two axial sides of the plug cone part blank at one time, so that the positioning error caused by repeated clamping is reduced, the machining precision of the part is improved, and the error caused by the workload of workers and multiple clamping on the part machining is also reduced.
Description
Technical Field
The invention relates to the field of machining of composite structural parts, in particular to a special fixture for a heat protection component, which can machine multiple surfaces of heat protection components and is applied to the field of machine tool machining.
Background
At present, the carbon/carbon composite material has high specific strength, wear resistance, high temperature resistance, high specific strength, good dimensional stability, small thermal expansion coefficient and other excellent mechanical properties and physical properties, so the carbon/carbon composite material has wide application in various fields of aviation, aerospace, advanced weapon systems, automobiles, electronics, environmental engineering, machinery manufacturing, instruments and meters, nuclear industry and the like.
The C/C composite material has the unique properties of higher strength, higher hardness, higher temperature resistance, higher corrosion resistance, light weight and the like, and becomes a novel material in the new material field. However, the blank of the C/C composite material arc bending structural member applied to the field of aviation is a special-shaped structural member, the clamping and positioning difficulties are high, and a plurality of problems still exist in the processing of an external convex curved surface: because the arc-shaped bending structural member belongs to a thin-wall structure, the C/C composite material belongs to a difficult-to-process material, positioning is difficult during part processing, processing deformation can occur when the processing process receives cutting force, processing is long in time consumption, and processing precision is difficult to guarantee.
Disclosure of Invention
The invention aims to provide a clamp for automatically clamping and controlling machining deformation, which can realize one-time clamping machining, thereby improving the machining efficiency of a plug convex surface of a plug cone.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a C/C composite material plug cone convex surface machining clamp comprises a bottom plate, wherein supporting devices for preliminarily supporting a plug cone piece are arranged on the bottom plate corresponding to two axial end parts of the plug cone piece; the concave curved surface of the plug cone piece is supported on the supporting device, so that the concave curved surface of the plug cone piece is used as the supporting bottom surface of the plug cone piece;
a clamping mechanism for fixing the end part of the plug cone is arranged at one axial end of the plug cone, and a pushing device for pushing the plug cone into a C-shaped clamping opening of the clamping mechanism is arranged at the other axial end of the plug cone; the outer convex curved surface of the plug cone piece is provided with a pressing device for pressing the plug cone piece on the supporting device;
the bottom plate corresponding to the two end faces of the curved surface of the plug cone piece is provided with a balance supporting device, and the balance supporting device provides supporting force for ensuring circumferential balance during the processing of the plug cone piece after the plug cone piece is fixed and compressed by the clamping mechanism, the pushing device and the compressing device;
the device comprises a plug cone piece, a base plate, a support rod piece and a support rod piece, wherein the base plate is used for preventing the plug cone piece from deforming in the processing process, the support rod piece is arranged on the concave curved surface of the plug cone piece, namely the base plate corresponding to the support bottom surface of the plug cone piece, the support rod pieces are arranged on two sides of the axis of the plug cone piece in pairs and equidistantly, and the end part of the support rod piece is in contact with the concave curved surface of the plug cone piece.
Further, the supporting device is a pair of supporting plates respectively arranged at two axial end parts of the plug cone, the width of the supporting plates is matched with the circumferential width of the plug cone, and the end surfaces of the supporting plates, which are contacted with the plug cone, are provided with mounting inclined planes which are used for being matched with the concave curved surfaces of the plug cone;
the top that still includes, is equipped with the supporting shoe that is used for the cooperation to support the concave curved surface top of stopper cone piece at least one backup pad and stopper cone piece contact, be equipped with at the top surface of supporting shoe with concave curved surface top curved surface assorted support curved surface.
Further, the clamping mechanism comprises an inclined support, the inclined support is arranged on the supporting device through at least one pair of bolts, and an included angle between an inclined installation axis of the inclined support and a central line of the radian of the concave curved surface of the plug member is a, so that the clamping mechanism can clamp the plug member in an adaptive manner;
an inverted L-shaped support is arranged on the inclined support, one end of the inverted L-shaped support is fixed on the top surface of the inclined support, a pressing block is arranged at the other end of the inverted L-shaped support through a first screw nut, one end of a screw of the first screw nut is arranged on the inverted L-shaped support in a penetrating manner, a nut of the first screw nut is arranged at one end of the screw penetrating out of the inverted L-shaped support, and the pressing block is fixedly arranged at the other end of the screw;
the top surfaces of the first screw nut, the pressing block, the inverted L-shaped support and the inclined support form a C-shaped clamping opening used for clamping the axial end surface of the plug cone, and the pushing device pushes the axial end of the plug cone into the C-shaped clamping opening, and the clamping strength of the C-shaped clamping opening to the plug cone is adjusted through the first screw nut and the pressing block.
Further, the pushing device comprises a pushing plate, one end of the pushing plate is tightly pressed on the axial end face of the plug cone, the other end of the pushing plate is installed on the supporting device through an upper screw and a lower screw, the upper screw is used for tightly pressing and fixing the pushing plate, and the lower screw is used for stably pushing the plate face and preventing the plate face from tilting.
Further, the included angle a is 30-60 degrees.
Further, the pressing device comprises a pressing plate with the width matched with the circumferential width of the plug cone, and second screw nuts passing through the two ends of the pressing plate are arranged on the machine tool or the bottom plate;
the pressing plate is provided with a concave surface which is matched with the convex curved surface of the plug cone, and the concave surface is contacted with the convex curved surface when the plug cone is pressed.
Further, the balance supporting device is arranged on the bottom plate corresponding to the axial length center position of the plug cone;
the balance supporting device comprises a pair of balance supporting blocks which are arranged corresponding to two end faces of the plug cone piece in the circumferential direction, the pair of balance supporting blocks are rotatably arranged at two ends of a supporting shaft through bearings, the supporting shaft is arranged on the bottom plate through a bearing seat, and the pair of balance supporting blocks are connected with the bottom plate through tension springs;
one end of the balance supporting block is provided with a convex surface which is in contact with the circumferential end surface of the plug cone, the other end of the balance supporting block is provided with a first screw, the bottom plate is provided with a second screw, two ends of the tension spring are arranged on the first screw and the second screw, the convex surface of the balance supporting block is positioned at a higher position, and the balance supporting block provides supporting force for the plug cone to jack up upwards.
Further, the support rod piece is a cylindrical support rod with a ball head top structure, the ball heads of the pair of support rod pieces are symmetrically contacted with the concave curved surfaces on two sides of the central axis of the plug cone piece, and the radial included angle of the contact points of the concave curved surfaces of the ball heads is 45-60 degrees, so that the plug cone piece is prevented from deforming in the processing process.
The invention also provides a processing method of the C/C composite material plug convex surface by using the clamp, which is characterized by comprising the following steps:
firstly, fixedly mounting a bottom plate on a machine tool;
secondly, placing the concave curved surface of the plug cone on the supporting surface of the supporting plate as a supporting surface, placing the concave top point of the concave curved surface corresponding to the supporting block, and aligning by a dial indicator or a dial indicator so as to determine the positions of the clamp and the plug cone in the machine tool, and further, adjusting the pushing plate to enable the pushing plate to press the plug cone in the C-shaped clamping opening;
then, adjusting a pair of bolts of the clamping mechanism to enable the inclined support to be in 30-60 degrees according to radian adaptation of the plug cone, screwing the first screw nut, and simultaneously compressing the plug cone by the pressing plate through the screw nut;
then, installing the support rod piece, and enabling the ball heads of the support rod piece to symmetrically contact the concave curved surfaces on two sides of the central axis of the plug cone piece so as to ensure the stability of a processing surface in the processing process; then hanging two ends of the tension springs at two sides on the first screw and the second screw respectively, so that the balance supporting blocks at two ends tightly press two sides of the plug cone piece, and further fixing the plug cone piece;
finally, sequentially rough milling the top surface, the side surface and the end surface of the convex curved surface of the plug cone; and then finish milling is carried out on the plug cone piece according to the rough milling sequence, so that one-time clamping from rough milling to finish milling of the plug cone piece is realized, and repeated clamping errors are avoided.
Further, when a gap exists between the plug cone and the supporting plate or the supporting block, the plug cone and the supporting plate or the supporting block are tightly contacted by adding a gasket.
The beneficial effects of the invention are as follows: according to the invention, the clamping mechanism, the pushing device and the pressing device are matched with each other to fix the C/C composite material plug cone piece on the base, and meanwhile, the balance supporting device is matched with the C/C composite material plug cone piece, so that the plug cone piece arranged on the supporting device can keep balance in the machining process, the clamping efficiency of the plug cone piece is greatly improved, rough milling and finish milling of the convex surface, the outer side surface and the top surface of the plug cone piece are realized in one clamping process, the finished part surface can be used as a reference for the finish machining of the follow-up convex surface, the positioning error caused by repeated clamping is reduced, the machining precision of the part is improved, and the workload of workers and the error caused by multiple clamping on the part machining are also reduced.
Meanwhile, the rigidity of the part in the machining process is improved by means of the method of installing the supporting rod on the bottom plate, the supporting rod is of a cylindrical rod structure with a ball head top structure and is in contact with the concave surface of the part, the supporting rod plays a supporting role on the part in the machining process, meanwhile, the rigidity of the workpiece is improved, the part is prevented from being deformed greatly and vibrated in the machining process, the part is prevented from being out of tolerance or even scrapped, and the machining quality problem of the C/C composite material plug cone clamp is effectively improved.
Drawings
FIG. 1 is a view of the overall structure of the clamp clamping C/C composite plug;
FIG. 2 is a schematic view of another view angle structure of the clamp clamping the C/C composite plug.
In the figure: 1-a bottom plate; 2-supporting means; 21-a support plate; 22-supporting blocks; 23-mounting inclined planes; 3-clamping mechanism; 31-an inclined support; 32-a pair of bolts; 33-an inverted L-shaped bracket; 34-a first lead screw nut; 35-briquetting; 4-a compressing device; 41-pressing plates; 42-a second lead screw nut; 43-concave; 5-a plug member; 6-supporting rod pieces; 7-balancing the supporting device; 71-a support shaft; 72-bearing seats; 73-balancing the supporting blocks; 74-first screw; 75-a second screw; 76-a tension spring; 8-pushing device; 81-pushing the plate; 82-screwing; 83-lower screw.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
Example 1: as shown in fig. 1 and 2, a C/C composite material plug convex surface machining fixture comprises a bottom plate 1, wherein a supporting device 2 for preliminarily supporting a plug member 5 is arranged on the bottom plate 1 corresponding to two axial end parts of the plug member 5; the concave curved surface of the plug member 5 is supported on the supporting device 2, so that the concave curved surface of the plug member 5 serves as the supporting bottom surface of the plug member 5;
the supporting device 2 is a pair of supporting plates 21 respectively arranged at two axial end parts of the plug member 5, the width of the supporting plates 21 is matched with the circumferential width of the plug member 4, and the end surfaces of the supporting plates 21 contacted with the plug member 4 are provided with mounting inclined planes 23 which are used for adapting to the concave curved surfaces of the plug member 4;
the top that is equipped with at least one backup pad 21 and stopper cone 4 contact is equipped with the supporting shoe 22 that is used for the concave curved surface top in cooperation support stopper cone 4, is equipped with the support curved surface with concave curved surface top curved surface assorted in the top of supporting shoe 22.
A clamping mechanism 3 for fixing the end part of the plug cone 5 is arranged at one axial end of the plug cone 5, and a pushing device 8 for pushing the plug cone 5 into a C-shaped clamping opening of the clamping mechanism 3 is arranged at the other axial end of the plug cone 5; the pressing device 4 for pressing the plug cone piece 5 on the supporting device 2 is arranged on the convex curved surface of the plug cone piece 5;
the clamping mechanism 3 comprises an inclined support 31, the inclined support 31 is arranged on the supporting device 2 through at least one pair of bolts 32, an included angle a between an inclined installation axis of the inclined support 31 and a central line of the radian of the concave curved surface of the plug member 5 is 30-60 degrees, and the included angle a is used for ensuring the adaptive clamping of the clamping mechanism 3 to the plug member 5;
an inverted L-shaped bracket 33 is arranged on the inclined support 31, one end of the inverted L-shaped bracket 33 is fixed on the top surface of the inclined support 31, a pressing block 35 is arranged at the other end of the inverted L-shaped bracket 33 through a first screw nut 34, one end of a screw of the first screw nut 34 is arranged on the inverted L-shaped bracket 33 in a penetrating way, a nut of the first screw nut 34 is arranged at one end of the screw penetrating out of the inverted L-shaped bracket 33, and the pressing block 35 is fixedly arranged at the other end of the screw;
the top surfaces of the first screw nut 34, the pressing block 35, the inverted L-shaped support 33 and the inclined support 31 form a C-shaped clamping opening used for clamping the axial end surface of the plug cone 5, and after the pushing device 8 pushes the axial end of the plug cone 5 into the C-shaped clamping opening, the clamping strength of the C-shaped clamping opening to the plug cone 5 is adjusted through the first screw nut 34 and the pressing block 35.
The bottom plate 1 corresponding to the two end faces of the curved surface of the plug cone 5 is provided with a balance supporting device 7, and the balance supporting device 7 provides supporting force for ensuring circumferential balance during processing of the plug cone 5 after the plug cone 5 is fixed and pressed by the clamping mechanism 3, the pushing device 8 and the pressing device 4.
The pushing device 8 comprises a pushing plate 81, one end of the pushing plate 81 is pressed on the axial end face of the plug cone 5, the other end of the pushing plate 81 is mounted on the supporting device 2 through an upper screw 82 and a lower screw 83, the upper screw 82 is used for pressing and fixing the pushing plate 81, and the lower screw 83 is used for stabilizing the surface of the pushing plate 81 and preventing the surface from tilting. The device further comprises support rods 6 for preventing the deformation of the plug cone piece 5 in the processing process, wherein the support rods 6 are arranged on the concave curved surface of the plug cone piece 4, namely, the bottom plates 3 corresponding to the support bottom surfaces of the plug cone piece 5, the support rods 6 are arranged on two sides of the axis of the plug cone piece 5 in pairs and equidistantly, and the end parts of the support rods 6 are in contact with the concave curved surface of the plug cone piece 4.
The pressing device 4 comprises a pressing plate 41 with the width matched with the circumferential width of the plug cone 5, and second screw nuts 42 passing through two ends of the pressing plate 41 are arranged on the machine tool or the bottom plate 1; the pressing plate 41 has a concave surface 43 adapted to the convex curved surface of the plug member 5, and the concave surface 43 is in contact with the convex curved surface when the plug member 5 is pressed.
The balance supporting device 7 is arranged on the bottom plate 1 corresponding to the axial length center position of the plug member 5; the balance supporting device 7 comprises a pair of balance supporting blocks 73 which are arranged corresponding to two end faces of the plug cone 5 in the circumferential direction, the pair of balance supporting blocks 73 are rotatably arranged at two ends of a supporting shaft 71 through bearings, the supporting shaft 71 is arranged on the bottom plate 1 through a bearing seat 72, and the pair of balance supporting blocks 73 are connected with the bottom plate 1 through tension springs 76; one end of the balance supporting block 73 is provided with a convex surface which is in contact with the circumferential end surface of the plug cone 5, the other end of the balance supporting block 73 is provided with a first screw 74, the bottom plate 1 is provided with a second screw 75, two ends of a tension spring 76 are arranged on the first screw 74 and the second screw 75, the convex surface of the balance supporting block 73 is located at a higher position, and the balance supporting block 73 provides supporting force for jacking up the plug cone 5.
The support rod pieces 6 are cylindrical support rods with ball head top structures, the ball heads of the pair of support rod pieces 6 are symmetrically contacted with the concave curved surfaces on two sides of the central axis of the plug cone piece 5, and the radial included angle of the contact points of the concave curved surfaces of the ball heads is 45-60 degrees, so that deformation of the plug cone piece 5 in the machining process is prevented.
Example 2: the invention also provides a processing method of the C/C composite material plug convex surface by using the clamp, which is characterized by comprising the following steps:
firstly, fixedly mounting a bottom plate 1 on a machine tool;
secondly, placing the concave curved surface of the plug cone 5 on the supporting surface of the supporting plate 21 as a supporting surface, placing the concave top point of the concave curved surface corresponding to the supporting block 22, and aligning by a dial indicator or a dial indicator to determine the positions of the clamp and the plug cone 5 in the machine tool, and further adjusting the pushing plate 81 to enable the pushing plate 81 to press the plug cone 5 in the C-shaped clamping opening;
then, a pair of bolts 32 of the clamping mechanism 3 are adjusted, so that the inclined support 31 is adapted to be 30-60 degrees according to the radian of the plug cone 5, the first screw nut 34 is screwed down, and meanwhile, the pressing plate 41 is used for pressing the plug cone 5 through the screw nut 42;
when a gap exists between the plug member 5 and the support plate 21 or the support block 22, the two are in close contact by adding a gasket.
Then, installing the support rod piece 6, and symmetrically contacting the ball heads of the support rod piece 6 on the concave curved surfaces on the two sides of the central axis of the plug cone piece 5 so as to ensure the stability of the processing surface in the processing process; and then, the two ends of the tension springs 76 at the two sides are respectively hung on the first screw 74 and the second screw 75, so that the balance supporting blocks 73 at the two ends tightly press the two sides of the plug cone piece, the plug cone piece 5 is further fixed, namely, the convex surfaces of the balance supporting blocks 73 are positioned at a higher position, and the balance supporting blocks 73 at the two ends upwards push the plug cone piece 5 to play a role in fixing.
Finally, sequentially rough milling the top surface, the side surface and the end surface of the convex curved surface of the plug cone piece 5; and then finish milling is carried out on the plug cone piece 5 according to the rough milling sequence, so that one-time clamping from rough milling to finish milling of the plug cone piece 5 is realized, and repeated clamping errors are avoided.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The clamp for machining the convex surface of the C/C composite material plug is characterized by comprising a bottom plate (1), wherein a supporting device (2) for preliminarily supporting the plug (5) is arranged on the bottom plate (1) corresponding to the two axial ends of the plug (5); the concave curved surface of the plug cone (5) is supported on the supporting device (2) so that the concave curved surface of the plug cone (5) is used as the supporting bottom surface of the plug cone (5);
a clamping mechanism (3) for fixing the end part of the plug cone (5) is arranged at one axial end of the plug cone (5), and a pushing device (8) for pushing the plug cone (5) into a C-shaped clamping opening of the clamping mechanism (3) is arranged at the other axial end of the plug cone (5); a pressing device (4) for pressing the plug cone piece (5) on the supporting device (2) is arranged on the convex curved surface of the plug cone piece (5);
the bottom plate (1) corresponding to the two end faces of the curved surface of the plug cone (5) is provided with a balance supporting device (7), and the balance supporting device (7) provides supporting force for ensuring circumferential balance during processing of the plug cone (5) after the plug cone (5) is fixed and pressed by the clamping mechanism (3), the pushing device (8) and the pressing device (4);
the device is characterized by further comprising support rods (6) used for preventing deformation of the plug cone (5) in the processing process, wherein the support rods (6) are installed on concave curved surfaces of the plug cone (4), namely, the bottom plates (3) corresponding to the support bottom surfaces of the plug cone (5), the support rods (6) are arranged on two sides of an axis of the plug cone (5) in pairs and equidistantly, and the end parts of the support rods (6) are in contact with the concave curved surfaces of the plug cone (4).
2. The C/C composite material plug convex processing clamp as claimed in claim 1, wherein the supporting device (2) is a pair of supporting plates (21) respectively arranged at two axial ends of the plug member (5), the width of the supporting plates (21) is matched with the circumferential width of the plug member (4), and an installation inclined plane (23) for matching with the concave curved surface of the plug member (4) is arranged on the end surface of the supporting plate (21) where the supporting plates (21) are contacted with the plug member (4);
the plug cone assembly comprises a plug cone (4), and is characterized in that the top of at least one supporting plate (21) in contact with the plug cone (4) is provided with a supporting block (22) used for supporting the top of the concave curved surface of the plug cone (4), and the top surface of the supporting block (22) is provided with a supporting curved surface matched with the curved surface of the top of the concave curved surface.
3. The C/C composite material plug convex processing clamp according to claim 1, wherein the clamping mechanism (3) comprises an inclined support (31), the inclined support (31) is mounted on the supporting device (2) through at least one pair of bolts (32), and an included angle between an inclined mounting axis of the inclined support (31) and a central line of an arc of an inward concave curved surface of the plug member (5) is a so as to ensure that the clamping mechanism (3) clamps the plug member (5) in an adapting manner;
an inverted L-shaped support (33) is arranged on the inclined support (31), one end of the inverted L-shaped support (33) is fixed on the top surface of the inclined support (31), a pressing block (35) is arranged at the other end of the inverted L-shaped support (33) through a first screw nut (34), one end of a screw of the first screw nut (34) is arranged on the inverted L-shaped support (33) in a penetrating manner, a nut of the first screw nut (34) is arranged at one end of the screw penetrating out of the inverted L-shaped support (33), and the pressing block (35) is fixedly arranged at the other end of the screw;
the top surfaces of the first screw nut (34), the pressing block (35), the inverted L-shaped support (33) and the inclined support (31) form a C-shaped clamping opening used for clamping the axial end surface of the plug cone (5), and the pushing device (8) pushes the axial end part of the plug cone (5) into the C-shaped clamping opening, and then the clamping strength of the C-shaped clamping opening to the plug cone (5) is adjusted through the first screw nut (34) and the pressing block (35).
4. A C/C composite material plug convex processing clamp as claimed in claim 3, wherein the pushing device (8) comprises a pushing plate (81), one end of the pushing plate (81) is pressed on the axial end face of the plug member (5), the other end of the pushing plate (81) is arranged on the supporting device (2) through an upper screw (82) and a lower screw (83), the upper screw (82) is used for pressing and fixing the pushing plate (81), and the lower screw (83) is used for stabilizing the surface of the pushing plate (81) and preventing the surface from tilting.
5. A C/C composite plug convexity machining jig according to claim 3, wherein the included angle a is 30 ° to 60 °.
6. The C/C composite material plug convex machining fixture according to claim 1, wherein the pressing device (4) comprises a pressing plate (41) matched with the circumferential width of the plug member (5), and second screw nuts (42) passing through two ends of the pressing plate (41) are mounted on a machine tool or a bottom plate (1);
the pressing plate (41) is provided with a concave surface (43) which is matched with the convex curved surface of the plug cone (5), and the concave surface (43) is contacted with the convex curved surface when the plug cone (5) is pressed.
7. The C/C composite material plug convex machining fixture according to claim 1, wherein the balance supporting device (7) is arranged on the bottom plate (1) corresponding to the axial length center position of the plug member (5);
the balance supporting device (7) comprises a pair of balance supporting blocks (73) which are arranged corresponding to two end faces of the plug cone (5) in the circumferential direction, the pair of balance supporting blocks (73) are rotatably arranged at two ends of a supporting shaft (71) through bearings, the supporting shaft (71) is arranged on the bottom plate (1) through bearing blocks (72), and the pair of balance supporting blocks (73) are connected with the bottom plate (1) through tension springs (76);
one end of the balance supporting block (73) is provided with a convex surface which is in contact with the circumferential end surface of the plug cone (5), the other end of the balance supporting block (73) is provided with a first screw (74), the bottom plate (1) is provided with a second screw (75), two ends of the tension spring (76) are arranged on the first screw (74) and the second screw (75), the convex surface of the balance supporting block (73) is located at a higher position, and the balance supporting block (73) provides supporting force for the plug cone (5) to jack up upwards.
8. The C/C composite material plug cone convex surface processing clamp as claimed in claim 1, wherein the support rod (6) is a cylindrical support rod with a ball head top structure, the ball heads of the pair of support rods (6) are symmetrically contacted and arranged on concave curved surfaces at two sides of the central axis of the plug cone (5), and the radial included angle of the contact point of the ball head on the concave curved surfaces is 45-60 degrees, so as to prevent the deformation of the plug cone (5) in the processing process.
9. A method for machining a convex surface of a C/C composite plug using the jig according to claims 1 to 8, comprising the steps of:
firstly, fixedly mounting a bottom plate (1) on a machine tool;
secondly, placing the concave curved surface of the plug cone (5) on the supporting surface of the supporting plate (21) as a supporting surface, placing the concave top point of the concave curved surface corresponding to the supporting block (22), and aligning through a dial indicator or a dial indicator so as to determine the positions of the clamp and the plug cone (5) in a machine tool, and further, adjusting a pushing plate (81) to enable the pushing plate (81) to press the plug cone (5) in a C-shaped clamping opening;
then, a pair of bolts (32) of the clamping mechanism (3) are adjusted, the inclined support (31) is adapted to be 30-60 degrees according to the radian of the plug cone (5), the first screw nut (34) is screwed down, and meanwhile, the pressing plate (41) is used for pressing the plug cone (5) through the screw nut (42);
then, installing the support rod piece (6), and symmetrically contacting the ball heads of the support rod piece (6) on the concave curved surfaces at the two sides of the central axis of the plug cone piece (5) so as to ensure the stability of a processing surface in the processing process; two ends of tension springs (76) at two sides are respectively hung on a first screw (74) and a second screw (75), so that balance supporting blocks (73) at two ends are propped against two sides of the plug cone piece, and the plug cone piece (5) is further fixed;
finally, sequentially rough milling the top surface, the side surface and the end surface of the convex curved surface of the plug cone (5); and then finish milling is carried out on the plug cone (5) according to the rough milling sequence, so that one-time clamping from rough milling to finish milling of the plug cone (5) is realized, and repeated clamping errors are avoided.
10. The method for processing the convex surface of the plug of the C/C composite material according to claim 9, which is characterized in that:
when a gap exists between the plug cone (5) and the supporting plate (21) or the supporting block (22), the plug cone and the supporting block are tightly contacted by adding a gasket.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311272642.2A CN117086664A (en) | 2023-09-28 | 2023-09-28 | C/C composite material plug cone convex surface machining clamp and machining method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311272642.2A CN117086664A (en) | 2023-09-28 | 2023-09-28 | C/C composite material plug cone convex surface machining clamp and machining method |
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| CN (1) | CN117086664A (en) |
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