A part clamping device using a through hole positioning

Abstract

The application discloses a part clamping device using a through hole positioning, and belongs to the technical field of aircraft engine part machining, which comprises a locking piece, a tensioning piece and a clamp assembly. The locking piece comprises a screw rod and a conical nut, the conical nut is arranged on the top of the screw rod, the tensioning piece is arranged on the screw rod, the screw rod is used for being connected with the clamp assembly after penetrating through a through hole arranged on a part, so that the part is clamped and positioned on the clamp assembly, the conical nut is used for extruding the tensioning piece during the process that the screw rod penetrates through the through hole arranged on the part, so that the tensioning piece is expanded to tightly press the inner wall of the through hole of the part to realize interference fit, and the clamp assembly is used for being connected to a machining platform. The part with the through hole is positioned and clamped on the clamp assembly through the locking piece and the tensioning sleeve, without needing to process a counterbore on the part, and without needing to clamp the outer side of the part, so that the part is not easily deformed, and the machining quality of the part is improved.

Description

Technical Field

[0001] The present application relates to the technical field of aerospace engine parts processing, and in particular, to a parts clamping device using through-hole positioning. Background Art

[0002] The information provided in this section is for the purpose of generally presenting the background of the present application. To the extent described in this section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present application.

[0003] There are a lot of similar instructions attached to aircraft engines. Figure 2 and 3 The pump body and cover parts shown in the figure have high requirements for both end faces' flatness (usually requiring a flat shading of no less than 70%) and strict parallelism between the two end faces (usually no greater than 0.02mm). The machining process requires sequential machining of both end faces to meet these requirements. Due to the extremely high precision requirements, the problem of clamping deformation during machining must be addressed.

[0004] Pump bodies and plate covers are usually in contact with lubricating oil and are used extensively in areas that require sealing. The flatness and parallelism of their end faces have a significant impact on the reliability of engine components. If machining requirements fail to meet these targets, it is very likely that the pump housing where they are located will experience lubricating oil leakage or the rotor assembled therein may not function properly. Therefore, the machining quality requirements for such parts are extremely high.

[0005] Currently, this type of part is mainly processed by fixing it with countersunk holes or soft claws, but both have their own limitations, as detailed below.

[0006] The advantage of using countersunk holes for fixing is that there are no restrictions on the part's contour shape, and the clamping area is solid, which reduces deformation. However, if the final part does not have this structure, it is necessary to use through holes to first machine the process countersunk holes. This not only increases the processing steps, but also may cause deformation when the process countersunk holes are subsequently finished into through holes. In addition, countersunk holes need to be set on both sides of the machining, which limits the number of holes on the part (at least two holes).

[0007] If you use the instructions Figure 4 The soft jaw hole shown in the figure fixes the outer circle of the part (similar to the fixing method of clamping the part with a three-jaw chuck). Not only does it require the part contour to be circular, but this method also requires a high level of skill from the processing personnel. Excessive clamping force may cause the outer edge and center areas of the part to be at different heights after processing. Excessive clamping force may cause the part to become circumferentially loose during processing.

[0008] The prior art has adopted various positioning methods for processing plate-shaped parts, such as a part processing method, a clamp and a manufacturing method thereof disclosed in Chinese Patent No. CN119260091A. The clamp comprises: a main body, which is plate-shaped, and has a first plane and a second plane perpendicular to the thickness direction and parallel to each other on the surface thereof; a clamping hole, which is a through circular hole, and one end of the clamping hole is located on the first plane; a deformation joint, which is provided on the main body, and communicates the first plane and the second plane, one end of the deformation joint is located in the main body, and the other end extends to the surface of the main body through the clamping hole, and separates the main body into a first part and a second part on the two sides of the deformation joint; a fastening hole, which extends into the second part after penetrating the first part, and the fastening hole is provided with an internal thread in the part of the second part; a fastener, which is a bolt, can be screwed into the fastening hole, and can drive the first part and the second part to approach each other; a spring hole, which is provided through the main body, and has a diameter larger than that of the clamping hole, the two ends of the spring hole are located on the first plane and the second plane respectively, and one end of the deformation joint communicates with the spring hole; a supporting plate, which is attached to the second plane and blocks the other end of the clamping hole; a clamped part, wherein the part comprises a first part with a first external thread part, the first external thread part of the first part is placed in the clamping hole, and one end of the first part abuts against the supporting plate, in this state, the clamping hole clamps the first external thread part with a predetermined clamping force, and the first part is processed exposed to one end of the clamping hole. By making the first plane and the second plane parallel, the vise can be used to conveniently clamp and fix the main body.

[0009] The technical scheme passes through the deformation joint through the clamping hole and separates the main body into the first part and the second part, so that after the part is placed in the clamping hole, the first part and the second part can be driven to approach each other by the fastening mechanism, so that the parts on both sides of the deformation joint of the clamping hole approach each other, and the part is clamped and fixed. Since the clamping hole is a circular hole, after the outer circumferential surface of the part is clamped and fixed, a surface contact is formed between the clamping hole and the outer circumferential surface of the part. Thus, the contact area between the part and the clamping hole can be increased, and the stability and firmness of the part clamped and fixed can be improved. However, the adaptability of the above-mentioned clamp scheme is narrow, and it is difficult to adapt to the stable clamping of parts with any number of through holes at any position.

[0010] The present application aims to solve the problems of positioning and fixing of parts during processing, effectively avoid the deformation of parts caused by excessive clamping force, and provide a part clamping device using through holes for positioning.

[0011] It should be noted that the information disclosed in the above BACKGROUND section is only for the purpose of facilitating the understanding of the background of the present application, and therefore can include information that does not constitute the prior art known to those of ordinary skill in the art. SUMMARY

[0012] In view of at least one of the above technical problems, the present application provides a part clamping device using a through hole for positioning, which can clamp a part with a through hole on a clamp assembly through cooperation of a locking piece and a tensioning sleeve, without the need for machining a counterbore on the part or clamping the outside of the part, which is prone to cause deformation of the part, thereby improving the processing quality of the part.

[0013] According to an aspect of the present application, a part clamping device using a through hole for positioning is provided for clamping a part provided with a through hole, and the part clamping device using a through hole for positioning comprises a locking piece, a tensioning piece, and a clamp assembly:

[0014] The locking piece comprises a screw rod and a conical nut, the conical nut is arranged at the top of the screw rod, the tensioning piece is arranged on the screw rod, the screw rod is used to pass through the through hole provided on the part and connect with the clamp assembly to clamp and position the part on the clamp assembly, the conical nut is used to extrude the tensioning piece during the process of the screw rod passing through the through hole provided on the part, so that the tensioning piece is expanded to tightly contact the inner wall of the through hole of the part to achieve interference fit, and the clamp assembly is used to be connected to a machining platform.

[0015] In some embodiments of the present application, the inner wall of the connecting inner hole of the tensioning piece is a conical inner wall structure, and the outer wall of the conical nut is a conical structure matched with the connecting inner hole.

[0016] In some embodiments of the present application, the outer wall of the tensioning piece is an arc structure.

[0017] In some embodiments of the present application, a expansion joint with a slotted structure is arranged on the outer wall of the tensioning piece.

[0018] In some embodiments of the present application, the clamp assembly comprises a clamping piece, a plurality of positioning connecting pieces, a sliding piece, and a limiting rod, a support column is arranged on the middle of the top surface of the clamping piece, the support column is used to support the part, the plurality of positioning connecting pieces are slidingly arranged on the top surface of the clamping piece, a second screw hole and a third screw hole are respectively arranged on the top surface of each positioning connecting piece and the side surface facing the outside of the clamping piece, the second screw hole is used to cooperate with the screw rod, the sliding piece is slidingly connected with the clamping piece, and the sliding piece slides circumferentially around the support column, and the limiting rod is used to pass through a limiting screw hole provided on the sliding piece and cooperate with the third screw hole.

[0019] In some embodiments of the present application, the clamp assembly further comprises a plurality of connecting springs, each connecting spring is used to connect each positioning connecting piece with the support column.

[0020] In some embodiments of the present application, the top surface of the clamping piece is provided with a limiting groove, which is used for slidingly limiting the sliding piece.

[0021] In some embodiments of the present application, a groove part is formed on the inner wall of the limiting groove, and the bottom end of the sliding piece is provided with a limiting platform, which is used for being embedded in the groove part and being slidingly matched with the groove part.

[0022] In some embodiments of the present application, the limiting rod is provided with a handle at the end away from the third threaded hole.

[0023] In some embodiments of the present application, the top of the supporting column is provided with a first threaded hole, which is used for being matched with the screw rod.

[0024] The present application has the following beneficial effects:

[0025] The part clamping device using the through hole positioning of the present application can realize the positioning and clamping of the part on the clamp assembly through the cooperation of the screw rod of the locking piece and the clamp assembly after the screw rod passes through the pre-set through hole of the part, and the expansion piece is sleeved on the screw rod. The conical nut of the locking piece can tightly push the expansion piece to the inner wall of the through hole of the part during the process of the screw rod passing through the through hole of the part, so as to realize the interference fit between the expansion piece and the through hole of the part, strengthen the limiting and fixing effect of the part, and without the need of machining the counterbore of the part or clamping the outside of the part, which is easy to cause the deformation of the part, and is conducive to improving the machining quality of the part. The present application can realize the machining of double surfaces through one through hole, without the need of the counterbore of the part or the machining process of the counterbore, which reduces the limitation of the structure of the part and the machining process. The locking piece and the expansion piece of the present application can adjust the expansion degree through the tightening force, and there is no high-precision machining requirement for the matching through hole of the part, which reduces the machining cost. The expansion degree of the expansion piece of the present application can be adjusted in a large range, which can be matched with a size of screw rod for the matching of the through hole of the part in a certain size range, and has good adaptability.

[0026] Of course, it is not necessary for any product implementing the present application to achieve all the advantages described above. In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0028] Figure 1 is a schematic view of the cooperation of the part and the clamp assembly of the preferred embodiment of the present application;

[0029] Figure 2is a schematic diagram of a part with a hole in the prior art;

[0030] Figure 3 is Figure 2 is a schematic diagram of a part in the prior art;

[0031] Figure 4 is a schematic diagram of a soft jaw of a shaft in the prior art;

[0032] Figure 5 is a schematic diagram of a locking piece of the preferred embodiment of the present application;

[0033] Figure 6 is a schematic diagram of a tensioning piece of the preferred embodiment of the present application;

[0034] Figure 7 is a schematic diagram of a clamp assembly of the preferred embodiment of the present application;

[0035] Figure 8 is a schematic diagram of the installation of a limiting rod of the preferred embodiment of the present application;

[0036] Legend: 1, locking piece; 11, screw rod; 12, conical nut; 13, inner hexagonal hole; 2, tensioning piece; 21, connecting inner hole; 22, expansion joint; 3, clamp assembly; 31, clamping piece; 311, limiting groove; 3111, recessed part; 32, support column; 321, first screw hole; 33, positioning connecting piece; 331, second screw hole; 332, third screw hole; 34, sliding piece; 341, limiting platform; 35, connecting spring; 36, limiting rod; 361, handle; 37, mounting column. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0038] Figure 1 is a schematic diagram of the cooperation of a part and a clamp assembly of the preferred embodiment of the present application; Figure 2 is a schematic diagram of a part with a hole in the prior art; Figure 3 is Figure 2 is a schematic diagram of a part in the prior art; Figure 4 is a schematic diagram of a soft jaw of a shaft in the prior art; Figure 5 is a schematic diagram of a locking piece of the preferred embodiment of the present application; Figure 6 is a schematic diagram of a tensioning piece of the preferred embodiment of the present application; Figure 7 is a schematic diagram of a clamp assembly of the preferred embodiment of the present application; Figure 8 is a schematic diagram of the installation of a limiting rod of the preferred embodiment of the present application.

[0039] A part clamping device using through-hole positioning is used to clamp parts with preset through-holes. The part clamping device using through-hole positioning includes a locking member 1, a tensioning member 2, and a clamp assembly 3:

[0040] The locking member 1 includes a screw 11 and a conical nut 12. The conical nut 12 is arranged on the top of the screw 11. The tensioner 2 is used to be sleeved on the screw 11. The screw 11 is used to pass through the preset through hole on the part and then be connected to the clamp assembly 3 to clamp the part to the clamp assembly 3. The conical nut 12 is used to squeeze the tensioner 2 during the process of the screw 11 passing through the preset through hole on the part, so that the tensioner 2 expands and tightens the inner wall of the through hole on the part to achieve an interference fit. The clamp assembly 3 is used to be externally connected to the processing platform.

[0041] The "conical nut 12" here means a structure connected to the top of the screw 11 that serves to limit and tighten the screw 11. In some embodiments, a hexagonal hole 13 is provided at the top of the conical nut 12 to facilitate the quick tightening or loosening of the screw 11 with the help of tools.

[0042] Here, the “tensioner 2” refers to an expandable flexible positioning component sleeved on the screw rod 11 . In some embodiments, the main body of the tensioner 2 is a structure similar to a tension sleeve.

[0043] When using the present application, first pass the tensioner 2 from under the screw 11, combine the conical inner wall of the tensioner 2 and the conical nut 12 of the locking member 1 and place them in the through hole on the part, and then screw it into the matching threaded hole of the clamp assembly 3 through the inner hexagonal hole 13 at the top of the conical nut 12. When the bottom of the tensioner 2 contacts the matching surface of the clamp assembly 3, continue to tighten the screw 11, and the conical nut 12 squeezes the conical inner wall of the tensioner 2, so that the outer edge of its arc surface expands and contacts the inner hole of the part, and the positioning and fixing function is achieved through the interference fit between the tensioner 2 and the inner hole of the part.

[0044] The present application discloses a part clamping device using through-hole positioning. After the screw 11 of the locking member 1 passes through a preset through-hole on the part and cooperates with the clamp assembly 3, the part can be positioned and clamped to the clamp assembly 3. At the same time, the tensioning member 2 is sleeved on the screw 11, and the conical nut 12 of the locking member 1 can tighten the tensioning member 2 to the inner wall of the part through-hole during the process of the screw 11 passing through the through-hole on the part, so as to achieve an interference fit between the tensioning member 2 and the through-hole of the part, thereby strengthening the limiting and fixing effect on the part, without the need to process countersinks on the part, and without the need to clamp the outside of the part, which can easily cause the part to deform, thereby improving the processing quality of the part. The present application can achieve the double-sided processing function through a through-hole, without the need for countersunk holes or processing countersunk holes in the part, thereby reducing the restrictions on the part structure and the processing procedures.

[0045] It should be noted that the through hole on the part for positioning and fixing function needs high machining precision to realize the positioning function, the locking piece 1 and the expansion piece 2 of the application adjust the expansion degree through the tightening force, and there is no high precision machining requirement for the matching through hole on the part, thereby reducing the machining cost. Meanwhile, the expansion degree of the expansion piece 2 of the application can be adjusted in a large range, can be matched with a size screw rod 11 for the matching of the through hole of the part in a certain size range, has good adaptability, achieves the function of "one matching multiple", and can further expand the application range through multiple groups of expansion pieces 2 with different outer diameter size specifications.

[0046] Preferably, referring to Figure 1 , the inner wall of the connecting inner hole 21 of the expansion piece 2 is a tapered inner wall structure, and the outer wall of the tapered nut 12 is a tapered structure matched with the connecting inner hole 21.

[0047] It can be understood that when the tapered nut 12 is continuously screwed into the connecting inner hole 21 of the expansion piece 2, the tapered outer wall of the tapered nut 12 cooperates with the tapered connecting inner hole 21 to continuously extrude and expand the expansion piece 2 outward, so as to realize the interference fit between the expansion piece 2 and the through hole of the part, and play a role in strengthening the fixation.

[0048] It should be noted that the cross section of the tapered nut 12 is a tapered structure with the upper part being wide and the lower part being narrow, and the cross section of the connecting inner hole 21 is a tapered structure with the upper part being narrow and the lower part being wide, so that the two can be smoothly matched, so that the tapered nut 12 can quickly extrude and expand the expansion piece 2 to ensure the close connection and cooperation with the through hole of the part.

[0049] Preferably, referring to Figure 1 and Figure 6 , the outer wall of the expansion piece 2 is an arc structure.

[0050] It can be understood that the arc surface of the outer edge of the expansion piece 2 changes the surface contact into line contact relative to the ordinary cylindrical surface, which can reduce the contact area and solve the problem of local mismatching between the part and the clamp caused by the expansion when the perpendicularity of the through hole on the part to the bottom surface is poor; in addition, the arc surface structure of the outer edge of the expansion piece 2 leaves gaps up and down when contacting with the inner hole of the part, which can ensure that it will not cause multi-point contact after expansion due to deformation, and through machining verification, the structure can well improve the part flatness and parallelism machining quality.

[0051] Preferably, referring to Figure 1 and Figure 6 , the expansion piece 2 is provided with a telescopic joint 22 with a slotted structure on the outer wall.

[0052] It can be understood that the expansion joint 22 is arranged on the outer wall of the tensioning piece 2, which can further improve the expansion range of the tensioning piece 2, and can improve the adaptability of the tensioning piece 2 to the through holes of parts of different sizes. This is not only conducive to reducing the manufacturing cost, but also facilitates workers to directly select and clamp the parts, without the need to set multiple sets of parts of different specifications, thereby reducing the workload of classification.

[0053] Preferably, as shown in Figure 7 , 8 The clamp assembly 3 includes a clamping piece 31, a plurality of positioning connecting pieces 33, a sliding piece 34, and a limiting rod 36. The middle part of the top surface of the clamping piece 31 is provided with a support column 32 for supporting the part. The plurality of positioning connecting pieces 33 are slidingly arranged on the top surface of the clamping piece 31. The top surface and the side surface of each positioning connecting piece 33 facing the outside of the clamping piece 31 are respectively provided with a second screw hole 331 and a third screw hole 332. The second screw hole 331 is used for cooperation with the screw rod 11. The sliding piece 34 is slidingly connected with the clamping piece 31, and the sliding piece 34 slides circumferentially around the support column 32. The limiting rod 36 is used for penetrating through the limiting screw hole 341 of the sliding piece 34 and cooperating with the third screw hole 332.

[0054] It can be understood that the plurality of positioning connecting pieces 33 can stably position and fix the part on the clamping piece 31 by cooperating with the plurality of screw rods 11. The plurality of positioning connecting pieces 33 can be slidingly adjusted in position, so as to realize the cooperation of the positioning connecting piece 33 with the part having any shape, any number of through holes, and any position. Specifically, when the screw rod 11 penetrates through the through hole of the part, the screw rod 11 is in threaded cooperation with the through hole of the part. The bottom end of the screw rod 11 is further connected with the second screw hole 331 at the top of the positioning connecting piece 33 through the threaded connection. The conical nut 12 at the top of the screw rod 11 cooperates with the tensioning piece 2 to press the part to the top of the positioning connecting piece 33. Meanwhile, the support column 32 can also support the bottom of the part. The limiting rod 36 penetrates through the sliding piece 34 and cooperates with the third screw hole 332 at the side of the positioning connecting piece 33, so as to realize the limiting and reinforcing fixation of the positioning connecting piece 33, and ensure the connection stability of the part and the positioning connecting piece 33. Thus, the operation of clamping the part to the clamp assembly 3 can be realized. The positioning connecting piece 33 which can be flexibly adjusted in position can realize the cooperation of the clamp assembly 3 with various parts, and greatly improve the adaptability of the clamp assembly 3.

[0055] It should be noted that the clamping piece 31 is in a disc or plate structure. The bottom of the clamping piece 31 is provided with a mounting column 37. The mounting column 37 can be limitingly fixed on a machining platform or an operation platform, so as to realize the subsequent machining process of the part.

[0056] Preferably, as shown in Figure 7As shown, the clamp assembly 3 further comprises a plurality of connecting springs 35, each of which is used to connect each positioning connector 33 with the support column 32.

[0057] It can be understood that each positioning connector 33 is connected with the support column 32 through the connecting spring 35, and the positioning connector 33 can be accommodated through the connecting spring 35 to prevent the positioning connector 33 from easily falling off, and the connecting spring 35 can also facilitate the position adjustment of the positioning connector 33, especially the rotation, so that the positioning connector 33 can be smoothly matched with the limiting rod 36; at the same time, the connecting spring 35 can also play a buffering and strengthening limiting role on the positioning connector 33, and when the positioning connector 33 slides to different positions, the connecting spring 35 connected therewith can be compressed or stretched, so that the connecting spring 35 can exert a force on the positioning connector 33, and the limiting rod 36 inserted into the positioning connector 33 can realize the multi-directional supporting effect on the positioning connector 33, thereby ensuring the stability of the positioning connector 33.

[0058] It should be noted that the height of the positioning connector 33 is less than the height of the support column 32, so that when the part is attached to the support column 32, the positioning connector 33 can still slide and adjust the position to accurately cooperate with the screw rod 11.

[0059] Preferably, please refer to Figure 8 As shown, the top surface of the clamping piece 31 is provided with a limiting groove 311, which is used for sliding limiting the sliding piece 34.

[0060] In the preferred embodiment, a groove portion 3111 is formed on the inner wall of the limiting groove 311, and the sliding piece 34 is provided with a limiting platform 341 at the bottom end, which is used for embedding the groove portion 3111 and slidingly cooperating with the groove portion 3111.

[0061] It can be understood that the sliding piece 34 can axially slide on the clamping piece 31 around the support column 32, specifically, the top surface of the clamping piece 31 is provided with a limiting groove 311, and a groove portion 3111 is formed on the inner wall of the limiting groove 311, and the sliding piece 34 is matched with the groove portion 3111 through the limiting platform 341 at the bottom to realize that the upper part of the sliding piece 34 is exposed outside the limiting groove 311, and the bottom of the sliding piece 34 is slidingly limited by the limiting platform 341 and the groove portion 3111. In the present application, the sliding piece 34 is preferably matched with the limiting rod 36 through threads to realize the stable connection of the limiting rod 36, thereby improving the connection stability of the limiting rod 36 and the positioning connector 33 and strengthening the limiting effect of the limiting rod 36 on the positioning connector 33.

[0062] It should be noted that the outer side of the clamping piece 31 is provided with a gap for the disassembly and assembly of the sliding piece 34, and the gap is opened and closed by the cover plate matched with the bolt connected to the side wall of the clamping piece 31, that is, the disassembly and assembly of the sliding piece 34 can be realized conveniently, so as to maintain and replace, or clean the limiting groove 311, to ensure the smoothness of the sliding of the sliding piece 34 and the efficiency in the processing process.

[0063] Preferably, referring to Figure 7 and 8 It should be noted that the outer side of the clamping piece 31 is provided with a gap for the disassembly and assembly of the sliding piece 34, and the gap is opened and closed by the cover plate matched with the bolt connected to the side wall of the clamping piece 31, that is, the disassembly and assembly of the sliding piece 34 can be realized conveniently, so as to maintain and replace, or clean the limiting groove 311, to ensure the smoothness of the sliding of the sliding piece 34 and the efficiency in the processing process.

[0064] It should be noted that the outer side of the clamping piece 31 is provided with a gap for the disassembly and assembly of the sliding piece 34, and the gap is opened and closed by the cover plate matched with the bolt connected to the side wall of the clamping piece 31, that is, the disassembly and assembly of the sliding piece 34 can be realized conveniently, so as to maintain and replace, or clean the limiting groove 311, to ensure the smoothness of the sliding of the sliding piece 34 and the efficiency in the processing process.

[0065] Preferably, referring to Figure 7 and Figure 8 It should be noted that the outer side of the clamping piece 31 is provided with a gap for the disassembly and assembly of the sliding piece 34, and the gap is opened and closed by the cover plate matched with the bolt connected to the side wall of the clamping piece 31, that is, the disassembly and assembly of the sliding piece 34 can be realized conveniently, so as to maintain and replace, or clean the limiting groove 311, to ensure the smoothness of the sliding of the sliding piece 34 and the efficiency in the processing process.

[0066] It should be noted that the outer side of the clamping piece 31 is provided with a gap for the disassembly and assembly of the sliding piece 34, and the gap is opened and closed by the cover plate matched with the bolt connected to the side wall of the clamping piece 31, that is, the disassembly and assembly of the sliding piece 34 can be realized conveniently, so as to maintain and replace, or clean the limiting groove 311, to ensure the smoothness of the sliding of the sliding piece 34 and the efficiency in the processing process.

[0067] In summary, the application designs a tensioning positioning structure, which realizes the tensioning positioning and fixing function of the part through the through hole pre-set on the part, can solve the problem that various conventional positioning and fixing cannot meet the requirements, and is especially suitable for various parts structures with high requirements for flatness and parallelism. Compared with the conventional positioning and fixing scheme, the application has the following advantages:

[0068] 1) The application can achieve double-sided processing through a through hole on the part, without the need for the part to have a counterbore hole or to process a counterbore hole, thereby reducing the limitation on the part structure and the processing procedure.

[0069] 2) The hole usually used for positioning and fixing function needs high machining precision to realize the positioning function, while the locking piece 1 and the tensioning piece 2 of the application adjust the tensioning degree through the tightening force, without high-precision machining requirement for the matching through hole on the part, thereby reducing the machining cost.

[0070] 3) The use scene of the application can be adjusted in a wide range, the tensioning degree of the tensioning piece 2 can be adjusted, and the tensioning piece 2 can be matched with a screw rod 11 of one size to be used for the cooperation of parts through holes in a certain size range, so that the function of “one set of multiple” is achieved, and the application range is further expanded through multiple groups of tensioning pieces 2 of different outer diameter size specifications.

[0071] 4) The arc-shaped outer edge surface of the tensioning piece 2 of the application can well solve the clamping deformation problem that may be caused by the poor perpendicularity between the part positioning hole and the end face, and improve the machining quality.

[0072] It should be noted that in this text, the terms “include”, “contain” or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes the elements inherent to such process, method, article or equipment.

[0073] The principles and implementation modes of the application are described by applying specific examples in this text, and the above example description is only used to help understand the method of the application and its core idea. The above description is only the preferred implementation mode of the application, and it should be pointed out that, due to the limited nature of the language expression, there are infinite specific structures in objective world, and for ordinary skilled persons in the technical field, some improvements, refinements or changes can be made without departing from the principles of the application, and the above technical features can also be combined in an appropriate manner; the improvements, refinements, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, shall be regarded as the protection of the application.

Claims

1. A part clamping device for clamping a part provided with a through hole using the through hole, characterized by, The part clamping device using through hole positioning comprises a locking piece (1), a tensioning piece (2) and a clamp assembly (3): The locking piece (1) comprises a screw rod (11) and a conical nut (12), the conical nut (12) is arranged on the top of the screw rod (11), the tensioning piece (2) is arranged on the screw rod (11), the screw rod (11) is used for connecting with the clamp assembly (3) after penetrating through the through hole of the part, so as to clamp and limit the part on the clamp assembly (3), the conical nut (12) is used for extruding the tensioning piece (2) during the process that the screw rod (11) penetrates through the through hole of the part, so that the tensioning piece (2) is expanded to tightly contact the inner wall of the through hole of the part to realize interference fit, and the clamp assembly (3) is used for being connected to the machining platform; the clamp assembly (3) comprises a clamping piece (31), a plurality of positioning connecting pieces (33), a sliding piece (34) and a limiting rod (36), the middle part of the top surface of the clamping piece (31) is provided with a supporting column (32), the supporting column (32) is used for supporting the part, the plurality of positioning connecting pieces (33) are slidingly arranged on the top surface of the clamping piece (31), the top surface and the side surface of each positioning connecting piece (33) are respectively provided with a second screw hole (331) and a third screw hole (332), the second screw hole (331) is used for cooperating with the screw rod (11), the sliding piece (34) is slidingly connected with the clamping piece (31), and the sliding piece (34) slides around the supporting column (32) in the circumferential direction, and the limiting rod (36) is used for penetrating through the limiting screw hole (36) of the sliding piece (34) and cooperating with the third screw hole (332).

2. A part clamping device for positioning using a through hole according to claim 1, wherein The inner wall of the connecting inner hole (21) of the tensioning piece (2) is a conical inner wall structure, and the outer wall of the conical nut (12) is a conical structure matched with the connecting inner hole (21).

3. A part clamping device for positioning using a through hole according to claim 1, wherein The outer wall of the tensioning piece (2) is an arc structure.

4. A part clamping device using a through hole for positioning according to claim 3, wherein, The outer wall of the tensioning piece (2) is provided with a expansion joint (22) of a inclined groove structure.

5. A part clamping device for positioning using a through hole according to claim 1, wherein The clamp assembly (3) further comprises a plurality of connecting springs (35), and each connecting spring (35) is used for connecting each positioning connecting piece (33) with the supporting column (32).

6. A part clamping device for positioning using a through hole according to claim 1, wherein The top surface of the clamping piece (31) is provided with a limiting groove (311), and the limiting groove (311) is used for slidingly limiting the sliding piece (34).

7. A part clamping device using a through hole for positioning according to claim 6, wherein The inner wall of the limiting groove (311) is provided with a groove part (3111), and the bottom end of the sliding piece (34) is provided with a limiting platform (341), and the limiting platform (341) is used for being embedded in the groove part (3111) and slidingly matched with the groove part (3111).

8. A part clamping device for positioning using a through hole according to claim 1, wherein The end, away from the third screw hole (332), of the limiting rod (36) is provided with a handle (361).

9. A part clamping device for positioning using a through hole according to claim 1, wherein, The top of the supporting column (32) is provided with a first screw hole (321), and the first screw hole (321) is used for cooperating with the screw rod (11).

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