Part clamping device using through hole for positioning

Abstract

The invention discloses a part clamping device using a through hole for positioning, and belongs to the technical field of aero-engine part machining, the part clamping device comprises a locking piece, a tensioning piece and a clamp assembly, the locking piece comprises a screw and a conical nut, the conical nut is arranged at the top of the screw, the tensioning piece is used for being arranged on the screw in a sleeving mode, and the clamping assembly is used for clamping the screw; the screw rod is used for penetrating through a preset through hole in a part to be connected with the clamp assembly so as to clamp and limit the part to the clamp assembly, and the conical nut is used for extruding the tensioning piece in the process that the screw rod penetrates through the preset through hole in the part so that the tensioning piece can be expanded to abut against the inner wall of the through hole in the part to achieve interference fit; the clamp assembly is used for being externally connected to a machining platform. The part with the through hole is positioned and clamped to the clamp assembly through cooperation of the locking piece and the tensioning sleeve, counter bores do not need to be machined in the part, the part does not need to be easily deformed due to the fact that the outer side of the part is clamped, and the machining quality of the part is improved advantageously.

Description

Technical Field

[0001] The present application relates to the technical field of aircraft 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 the flatness of both end faces (usually the flat coloring is required to be no less than 70%), and strict requirements for the parallelism between the two end faces (usually the parallelism is not greater than 0.02mm). The processing process requires the two end faces to be processed in sequence to ensure the requirements. Due to the very high precision requirements, the problem of clamping deformation during the processing must be solved.

[0004] Pump bodies and plate covers are usually in contact with lubricating oil and are used in large quantities in areas that require sealing. The flatness and parallelism of their end faces have a great impact on the working reliability of engine components. If the processing requirements are not met, it is very likely to cause lubricating oil leakage in the pump housing or the rotor combined therein may not work properly. Therefore, the processing quality requirements for such parts are very high.

[0005] Currently, this type of parts is mainly processed by fixing through process countersunk holes or soft claws, but each has its own limitations, as described below.

[0006] If countersunk holes are used for fixing, the advantage is that there is no restriction on the contour shape of the part, and the clamping part is solid. This method has a small deformation after clamping. However, when the part does not have this structure in the final state, it is necessary to use through holes to first machine the process countersunk holes, which not only increases the processing steps, but also may cause deformation when the process countersunk holes are subsequently fine-machined into through holes. In addition, countersunk holes on both sides need to be set for processing, and there is a limit on the number of holes on the part (at least two holes).

[0007] If the instructions are as follows Figure 4 The soft claw 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 places high demands on the skill level of the processing personnel. Excessive clamping force may cause the outer edge and center area of ​​the part to be at different heights after processing. Excessive clamping force may cause the part to become circumferentially loose during processing.

[0008] In the prior art, a variety of positioning methods are used for processing plate-like parts. For example, a Chinese patent with patent number CN119260091A discloses a processing method, a fixture and a manufacturing method of a part, wherein the fixture comprises: a main body, the main body is in the shape of a plate, and its surface has a first plane and a second plane perpendicular to the thickness direction and parallel to each other; a clamping hole, the clamping hole is a through circular hole, and one end of the clamping hole is located on the first plane; a deformation seam, the deformation seam is arranged on the main body, connecting the first plane and the second plane, one end of the deformation seam is located in the main body, and the other end passes through the clamping hole and extends to the surface of the main body, separating the two parts of the main body corresponding to the two sides of the deformation seam into a first part and a second part; a fastening hole, the fastening hole penetrates the first part and extends into the second part, and the fastening hole is located in the part of the second part An internal thread is arranged in the body; a fastener, which is a bolt, which can be screwed into the fastening hole and can drive the first part and the second part to be close to each other; a spring hole, which is arranged on the body through and has a diameter larger than the clamping hole, and the two ends of the spring hole are respectively located on the first plane and the second plane, and one end of the deformation seam is connected with the spring hole; a support plate, which is attached to the second plane and blocks the other end of the clamping hole; a clamping part, wherein the part includes a first part with a first external threaded part, the first external threaded part of the first part is placed in the clamping hole, and one end of the first part is abutted against the support plate, in this state, the first external threaded part is clamped in the clamping hole with a predetermined clamping force; and the end of the first part exposed from the clamping hole is processed. By making the first plane parallel to the second plane, it is convenient to clamp and fix the body with a vise.

[0009] This technical solution allows the deformation seam to pass through the clamping hole and divides the main body into a first part and a second part, so that after the part is placed in the clamping hole, the first part and the second part can be driven close together by the fastening mechanism, so that the parts of the clamping hole on both sides of the deformation seam can be brought close together to clamp and fix the part. Since the clamping hole is a circular hole, after the outer peripheral surface of the part is clamped and fixed, a surface contact is formed between the clamping hole and the outer peripheral surface of the part. In this way, the contact area between the part and the clamping hole can be increased, thereby improving the stability and firmness of the part clamping and fixing. However, the adaptability of the above-mentioned clamping solution is narrow, and it is difficult to adapt to the stable clamping of parts with any number of through holes opened at any position.

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

[0011] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0012] In view of at least one of the above technical problems, the present application provides a part clamping device using through-hole positioning, which can position and clamp parts with through-holes onto a fixture assembly through a locking piece and a tension sleeve. There is no need to process countersinks on the parts, nor is there any need to clamp the outside of the parts which may easily cause deformation of the parts, which is beneficial to improving the processing quality of the parts.

[0013] According to one aspect of the present application, a part clamping device using through-hole positioning is provided, which is used to clamp a part with a through-hole preset. The part clamping device using through-hole positioning includes a locking member, a tensioning member and a clamp assembly:

[0014] The locking part includes a screw and a conical nut. The conical nut is arranged on the top of the screw. The tensioner is used to be sleeved on the screw. The screw is used to pass through a preset through hole on the part and then be connected to the clamp assembly to clamp the part to the clamp assembly. The conical nut is used to squeeze the tensioner during the process of the screw passing through the preset through hole on the part so that the tensioner expands and tightens the inner wall of the through hole on the part to achieve an interference fit. The clamp assembly is used to be externally connected to a processing platform.

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

[0016] In some embodiments of the present application, the outer wall of the tensioner is an arc-shaped structure.

[0017] In some embodiments of the present application, an expansion joint with an oblique groove structure is provided on the outer wall of the tensioner.

[0018] In some embodiments of the present application, the clamp assembly includes a clamping member, a plurality of positioning connecting members, a sliding member and a limiting rod. A support column is arranged in the middle of the top surface of the clamping member, and the support column is used to support the parts. A plurality of positioning connecting members are slidably arranged on the top surface of the clamping member. A second screw hole and a third screw hole are respectively provided on the top surface and the side surface facing the outside of the clamping member. The second screw hole is used to cooperate with the screw rod. The sliding member is slidably connected to the clamping member, and the sliding member slides circumferentially around the support column. The limiting rod is used to pass through the preset limiting screw hole on the sliding member and then cooperate with the third screw hole.

[0019] In some embodiments of the present application, the clamp assembly further includes a plurality of connecting springs, each connecting spring being used to simultaneously connect each positioning connector to a support column.

[0020] In some embodiments of the present application, a circle of limiting grooves is provided on the top surface of the clamping member, and the limiting grooves are used to limit the sliding position of the sliding member.

[0021] In some embodiments of the present application, a groove portion is provided on the inner wall of the limiting groove, and a limiting platform is provided at the bottom end of the sliding member, and the limiting platform is used to be embedded in the groove portion and slidably cooperate with the groove portion.

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

[0023] In some embodiments of the present application, a first screw hole is provided at the top of the support column, and the first screw hole is used to cooperate with the screw rod.

[0024] This application has the following beneficial effects:

[0025] The present application discloses a part clamping device using through-hole positioning, wherein the screw of the locking piece passes through a preset through-hole on the part and cooperates with the clamp assembly, so that the part can be positioned and clamped on the clamp assembly. At the same time, the tensioning piece is sleeved on the screw, and the conical nut of the locking piece can tighten the tensioning piece to the inner wall of the through-hole of the part during the process of the screw passing through the through-hole on the part, so as to achieve an interference fit between the tensioning piece 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 may easily cause the part to deform, thereby helping to improve 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 parts, reducing restrictions on part structure and processing procedures; the locking member and tensioning member of the present application adjust the degree of tension through the tightening force, and there is no high-precision processing requirement for the matching through holes on the parts, reducing processing costs; the tensioning member of the present application has a large adjustable range of tension, and can be used with a screw of one size for matching through holes in parts within a certain size range, and has good adaptability.

[0026] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above at the same time. In addition to the purposes, features and advantages described above, this application also has other purposes, features and advantages. The following will further describe this application in detail with reference to the figures. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 1 It is a schematic diagram of the cooperation between the parts and the fixture assembly of the preferred embodiment of the present application;

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

[0030] Figure 3 yes Figure 2 A schematic diagram of a cross-sectional view of the BB of the part;

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

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

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

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

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

[0036] Legend: 1. Locking piece; 11. Screw; 12. Conical nut; 13. Hexagonal hole; 2. Tensioner; 21. Connecting inner hole; 22. Expansion joint; 3. Clamp assembly; 31. Clamping piece; 311. Limiting groove; 3111. Recessed groove; 32. Support column; 321. First screw hole; 33. Positioning connector; 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 in conjunction with the accompanying drawings, but the present application can be implemented in a variety of different ways defined and covered below.

[0038] Figure 1 It is a schematic diagram of the cooperation between the parts and the fixture assembly of the preferred embodiment of the present application; Figure 2 It is a schematic diagram of a part with a through hole commonly used in the prior art; Figure 3 yes Figure 2 A schematic diagram of a cross-sectional view of the BB of the part; Figure 4 It is a structural schematic diagram of the soft claw of the shaft in the prior art; Figure 5 is a schematic structural diagram of a locking member in a preferred embodiment of the present application; Figure 6 This is a schematic diagram of the structure of a tensioning member of a preferred embodiment of the present application; Figure 7 is a structural schematic diagram of a clamp assembly according to a preferred embodiment of the present application; Figure 8 It is a schematic diagram of the installation of the limit rod of the preferred embodiment of the present application.

[0039] A part clamping device using through-hole positioning is used to clamp a part with a through-hole preset. 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 rod 11 and a conical nut 12. The conical nut 12 is arranged on the top of the screw rod 11. The tensioner 2 is used to be sleeved on the screw rod 11. The screw rod 11 is used to pass through a preset through hole on the part and then be connected to a 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 rod 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 a processing platform.

[0041] The meaning of "conical nut 12" here refers to a structure connected to the top of the screw 11 to limit and tighten the screw 11. In some embodiments, a hexagonal hole 13 is provided on the top of the conical nut 12 to facilitate the fast 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 the present application is in use, the tensioner 2 is first passed through under the screw rod 11, and the conical inner wall of the tensioner 2 is combined with the conical nut 12 of the locking member 1 and placed in the through hole on the part, and then the conical nut 12 is screwed into the matching threaded hole of the clamp assembly 3 through the inner hexagonal hole 13 at the top. When the bottom of the tensioner 2 contacts the matching surface of the clamp assembly 3, the screw rod 11 is continued to be tightened, and the conical nut 12 squeezes the conical inner wall of the tensioner 2, so that the outer edge of the arc surface expands and contacts the inner hole of the part, and the positioning and fixing function is realized by the interference fit between the tensioner 2 and the inner hole of the part.

[0044] The present application is a part clamping device using through-hole positioning. After the screw 11 of the locking member 1 passes through the preset through-hole on the part, it cooperates with the clamp assembly 3 to realize the positioning and clamping of the part 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 realize the interference fit between the tensioning member 2 and the through-hole of the part, strengthen the limiting and fixing effect on the part, and do not need to process the countersink on the part, nor do they need to clamp the outside of the part, which may cause the part to be easily deformed, which is conducive to 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 the part to have a countersunk hole or a processing countersunk hole, reducing the restrictions on the part structure and the processing procedures.

[0045] It should be noted that the through holes used for positioning and fixing functions on parts usually require high processing accuracy to achieve the positioning function. The locking member 1 and the tensioning member 2 of the present application adjust the tensioning degree by tightening force, and there is no high-precision processing requirement for the matching through holes on the parts, which reduces the processing cost. At the same time, the tensioning member 2 of the present application has a large adjustable range of tension, and can be used with a screw rod 11 of a certain size for matching through holes of parts within a certain size range, with good adaptability, achieving the "one for many" function, and can also be used through multiple sets of tensioning members 2 with different outer diameter size specifications to further expand the scope of application.

[0046] Preferably, please refer to Figure 1 As shown, the inner wall of the connecting inner hole 21 of the tensioner 2 is a conical inner wall structure, and the outer wall of the conical nut 12 is a conical structure that cooperates with the connecting inner hole 21 .

[0047] It can be understood that when the conical nut 12 is continuously screwed into the connecting inner hole 21 of the tensioner 2, the conical outer wall of the conical nut 12 cooperates with the conical connecting inner hole 21, and the tensioner 2 can be continuously squeezed outward to expand, thereby achieving an interference fit between the tensioner 2 and the through hole of the part, thereby playing a role in strengthening the fixation.

[0048] It should be noted that the cross-section of the conical nut 12 is a conical structure that is wide at the top and narrow at the bottom, and the cross-section of the connecting inner hole 21 is a conical structure that is narrow at the top and wide at the bottom, thereby achieving smooth cooperation between the two, so that the conical nut 12 can quickly squeeze the tensioner 2 to expand it, ensuring a tight connection with the through hole of the part.

[0049] Preferably, please refer to Figure 1 and Figure 6 As shown, the outer wall of the tensioning member 2 is an arc-shaped structure.

[0050] It can be understood that the curved surface on the outer edge of the tensioner 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 partial misfit between the part and the fixture caused by tensioning when the through hole on the part is not perpendicular to the bottom surface; in addition, when the outer edge of the tensioner 2 with the curved surface structure contacts the inner hole of the part, there is a gap above and below, which can ensure that it will not cause multiple points of contact due to its deformation after expansion. Through processing verification, this structure can well improve the flatness and parallelism processing quality of the parts.

[0051] Preferably, please refer to Figure 1 and Figure 6 As shown, an expansion joint 22 with an oblique groove structure is provided on the outer wall of the tensioning member 2 .

[0052] It can be understood that the expansion joint 22 with an oblique groove structure provided on the outer wall of the tensioner 2 can further increase the expansion range of the tensioner 2 and the adaptability of the tensioner 2 to the through holes of parts of different sizes, which is not only conducive to reducing manufacturing costs, but also convenient for workers to directly select the parts for clamping and positioning, without the need to set up multiple sets of parts of different specifications, thereby reducing the workload of classification.

[0053] Preferably, please refer to Figure 7 , 8 As shown, the clamp assembly 3 includes a clamping member 31, a plurality of positioning connecting members 33, a sliding member 34 and a limiting rod 36. A support column 32 is arranged in the middle of the top surface of the clamping member 31, and the support column 32 is used to support the parts. A plurality of positioning connecting members 33 are slidably arranged on the top surface of the clamping member 31. A second screw hole 331 and a third screw hole 332 are respectively provided on the top surface and the side surface facing the outside of the clamping member 31 of each positioning connecting member 33. The second screw hole 331 is used to cooperate with the screw rod 11. The sliding member 34 is slidably connected to the clamping member 31, and the sliding member 34 slides circumferentially around the support column 32. The limiting rod 36 is used to cooperate with the third screw hole 332 after passing through the preset limiting screw hole on the sliding member 34.

[0054] The locking cam 33 is a key component of the present invention, and the locking cam 33 is a key component of the present invention. The locking cam 33 is a key component of the present invention, and the key component of the present invention is a key component of the present invention. The flexibly adjustable positioning connector 33 enables the clamp assembly 3 to be widely matched with various parts, thereby greatly improving the adaptability of the clamp assembly 3.

[0055] It should be noted that the clamp 31 is a disc or plate structure, and a mounting column 37 is provided at the bottom of the clamp 31, which can be fixedly mounted on a processing platform or an operating platform by the mounting column 37 to realize subsequent processing procedures for the parts.

[0056] Preferably, please refer to Figure 7As shown, the clamp assembly 3 further includes a plurality of connecting springs 35 , each connecting spring 35 being used to simultaneously connect each positioning connector 33 to the supporting column 32 .

[0057] It can be understood that each positioning connector 33 is connected to the support column 32 via a connecting spring 35, and the connecting spring 35 can realize the storage function of the positioning connector 33 to prevent the positioning connector 33 from falling off easily. The connecting spring 35 can also facilitate the position adjustment of the positioning connector 33, especially rotation, so that the positioning connector 33 can smoothly cooperate with the limiting rod 36; at the same time, the connecting spring 35 can also buffer and strengthen the limiting function of the positioning connector 33. When the positioning connector 33 slides to different positions, the connecting spring 35 connected thereto can be compressed or stretched, so that the connecting spring 35 can apply a force to the positioning connector 33, and cooperate with the limiting rod 36 to insert into the positioning connector 33 to realize multi-directional support for 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 smaller than the height of the support column 32 to ensure that when the part is fitted with the support column 32 , the positioning connector 33 can also slide to a certain extent for position adjustment so as to accurately cooperate with the screw rod 11 .

[0059] Preferably, please refer to Figure 8 As shown, a circle of limiting grooves 311 are provided on the top surface of the clamping member 31 , and the limiting grooves 311 are used to limit the sliding of the sliding member 34 .

[0060] In this preferred embodiment, a groove portion 3111 is opened on the inner wall of the limiting groove 311 , and a limiting platform 341 is provided at the bottom end of the sliding member 34 . The limiting platform 341 is used to be embedded in the groove portion 3111 and slidably cooperate with the groove portion 3111 .

[0061] It is understandable that the sliding member 34 can slide axially on the clamping member 31 around the support column 32. Specifically, a circle of limiting grooves 311 is provided on the top surface of the clamping member 31, and a groove portion 3111 is provided on the inner wall of the limiting groove 311. The sliding member 34 cooperates with the groove portion 3111 through the limiting platform 341 at the bottom to realize that the upper part of the sliding member 34 is exposed outside the limiting groove 311, and the bottom of the sliding member 34 cooperates with the groove portion 3111 through the limiting platform 341 to slide and limit. In the present application, the sliding member 34 is preferably threadedly matched with the limiting rod 36 to achieve a stable connection with the limiting rod 36, thereby improving the connection stability between 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 a notch is opened on the outside of the clamp 31 for the sliding part 34 to be disassembled and assembled, and this notch is connected to the side wall of the clamp 31 through a cover plate and bolts for opening and closing, so that the sliding part 34 can be conveniently disassembled and assembled for maintenance and replacement, or the limit groove 311 can be cleaned, thereby ensuring the smooth sliding of the sliding part 34 and ensuring high efficiency during the processing.

[0063] Preferably, please refer to Figure 7 and 8 As shown, a handle 361 is provided at one end of the limiting rod 36 away from the third screw hole 332 .

[0064] It is understandable that by providing a handle 361 at the end of the limit rod 36 away from the third screw hole 332, the operator can conveniently turn the limit rod 36 through the handle 361 to achieve rapid cooperation between the limit rod 36 and the positioning connector 33, which is beneficial to improving the efficiency of parts clamping.

[0065] Preferably, please refer to Figure 7 and Figure 8 As shown, a first screw hole 321 is formed on the top of the support column 32 , and the first screw hole 321 is used to cooperate with the screw rod 11 .

[0066] It can be understood that the support column 32 not only supports the parts, but also has a first screw hole 321 at the top of the support column 32. The support column 32 can cooperate with the screw rod 11 to achieve the limiting and fixing effect on some parts. In particular, for some parts with a through hole in the center, the screw rod 11 can directly pass through the center through hole of the part and cooperate with the first screw hole 321 of the support column 32 to achieve the enhanced positioning and fixed clamping effect of the parts.

[0067] In summary, this application designs a tensioning and positioning structure, which realizes the tensioning, positioning and fixing functions of parts through preset through holes on parts, and can solve the problem that various conventional positioning and fixing cannot meet the requirements, and is especially suitable for various part structures with very high requirements for flatness and parallelism. Compared with conventional positioning and fixing solutions, it has the following advantages:

[0068] 1) The present application can achieve the double-sided processing function through a through hole on the part, without the need for countersunk holes on the part or processing countersunk holes, thereby reducing restrictions on the part structure and processing procedures.

[0069] 2) Holes usually used for positioning and fixing functions require high processing accuracy to achieve the positioning function. However, the locking member 1 and the tensioning member 2 of the present application adjust the degree of tension by tightening force, and there is no high-precision processing requirement for the matching through holes on the parts, thereby reducing the processing cost.

[0070] 3) The application scenario of the present invention has a wide adjustable range, and the tension of the tensioner 2 is adjustable. It can be used with a screw rod 11 of one size for the through holes of parts within a certain size range, achieving the "one for many" function. By using multiple sets of tensioners 2 with different outer diameter specifications, the scope of application is further expanded.

[0071] 4) The arc-shaped outer edge surface of the tensioning member 2 of the present application can effectively solve the problem of clamping deformation that may be caused by poor verticality between the positioning hole and the end face of the part, thereby improving the processing quality.

[0072] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0073] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection of this application.

Claims

1. A part clamping device using through-hole positioning, used for clamping parts with preset through-holes, characterized in that: The part clamping device using through-hole positioning comprises a locking member (1), a tensioning member (2) and a clamping assembly (3): The locking member (1) comprises a screw rod (11) and a conical nut (12), wherein the conical nut (12) is arranged on the top of the screw rod (11), and the tensioning member (2) is used to be sleeved on the screw rod (11). The screw rod (11) is used to pass through a preset through hole on the part and then be connected to a clamp assembly (3) so as to clamp and limit the part to the clamp assembly (3). The conical nut (12) is used to squeeze the tensioning member (2) during the process of the screw rod (11) passing through the preset through hole on the part so that the tensioning member (2) expands and tightens the inner wall of the through hole on the part to achieve an interference fit, and the clamp assembly (3) is used to be externally connected to a processing platform.

2. A part clamping device using through-hole positioning according to claim 1, characterized in that: The inner wall of the connecting inner hole (21) of the tensioning member (2) is a conical inner wall structure, and the outer wall of the conical nut (12) is a conical structure that matches the connecting inner hole (21).

3. A part clamping device using through-hole positioning according to claim 1, characterized in that: The outer wall of the tensioning member (2) is an arc-shaped structure.

4. A part clamping device using through-hole positioning according to claim 3, characterized in that: An expansion joint (22) with an oblique groove structure is provided on the outer wall of the tensioning member (2).

5. A part clamping device using through-hole positioning according to claim 1, characterized in that: The clamp assembly (3) comprises a clamping member (31), a plurality of positioning connecting members (33), a sliding member (34) and a limiting rod (36). A support column (32) is arranged in the middle of the top surface of the clamping member (31). The support column (32) is used to support parts. The plurality of positioning connecting members (33) are slidably arranged on the top surface of the clamping member (31). The top surface of each positioning connecting member (33) and the side surface facing the outside of the clamping member (31) are respectively provided with a second screw hole (331) and a third screw hole (332). The second screw hole (331) is used to cooperate with the screw rod (11). The sliding member (34) is slidably connected to the clamping member (31), and the sliding member (34) slides circumferentially around the support column (32). The limiting rod (36) is used to pass through a preset limiting screw hole on the sliding member (34) and then cooperate with the third screw hole (332).

6. A part clamping device using through-hole positioning according to claim 5, characterized in that: The clamp assembly (3) further comprises a plurality of connecting springs (35), each connecting spring (35) being used to simultaneously connect each positioning connecting member (33) to the supporting column (32).

7. A part clamping device using through-hole positioning according to claim 5, characterized in that: A circle of limiting grooves (311) is provided on the top surface of the clamping member (31), and the limiting grooves (311) are used to perform sliding limiting on the sliding member (34).

8. A part clamping device using through-hole positioning according to claim 7, characterized in that: A groove portion (3111) is provided on the inner wall of the limiting groove (311), and a limiting platform (341) is provided at the bottom end of the sliding member (34), and the limiting platform (341) is used to be embedded in the groove portion (3111) and slidably cooperate with the groove portion (3111).

9. A part clamping device using through-hole positioning according to claim 5, characterized in that: A handle (361) is provided at one end of the limiting rod (36) away from the third screw hole (332).

10. A part clamping device using through-hole positioning according to claim 5, characterized in that: A first screw hole (321) is provided at the top of the support column (32), and the first screw hole (321) is used to cooperate with the screw rod (11).

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