CN216989876U - High-precision large-size thin-wall part machining tool - Google Patents

Abstract

The high-precision large-size thin-wall part machining tool comprises a part to be machined; the part is provided with a process step inner hole prefabricated by the rough machining blank allowance finish machining; the inner hole of the process step extends towards the center along the shaft end surface of the part; taking an inner hole of the process step as a positioning reference, and providing an axial gland tool; the axial gland tool is concentric and axially compresses the parts to process the parts. The utility model processes the inner hole of the process step by means of the rough machining blank allowance of the part, and the inner hole of the process step is taken as the clamping and positioning reference of the subsequent machining, so that the clamping production cost such as a process head is not required to be additionally increased; the technical problems that high-precision large-size thin-wall parts are easy to deform and high in production cost in machining are solved; economical and practical, high-efficient and reliable.

Description

High-precision large-size thin-wall part machining tool

Technical Field

The utility model belongs to the technical field of clamping tools of operation transportation machine tools, and particularly relates to a high-precision large-size thin-wall part machining tool.

Background

In daily production, turning of large-sized thin-walled parts is often encountered, as shown in fig. 1: the inner hole phi 254H6, phi 300H7, 4 +/-0.025, M250 multiplied by 1.5-6H internal threads, the coaxiality deviation of the threads and the reference hole is less than or equal to phi 0.025, the parallelism of two end faces of the workpiece is less than or equal to 0.02, and the perpendicularity of the inner hole and the lower end face is less than or equal to 0.015; the machining accuracy of these dimensions is demanding.

Generally, parts such as the above-mentioned large-size thin-wall parts are processed in two ways: 1) clamping a large excircle at the lower end, and turning the excircle and an inner hole at the upper end; however, since the hole wall is too thin, machining defects such as chatter and cutter back-off are easily generated during machining. 2) After the allowance of the excircle of the large upper end is clamped, finely turning each inner hole and the excircle; the previously machined reference inner hole generates stress along with the thinning process of the hole wall in the machining process, so that the final reference deformation of the inner hole is caused. Obviously, both the two processing modes have the defects of certain processing methods, and the final design requirements of drawings cannot be met. As can be seen, machining of a large-sized thin-walled part is most prohibited by a jaw clamping method, namely, by performing three-point elliptical deformation on an inner hole of a workpiece without performing radial stress on the workpiece, which affects the machining of a reference hole and the finish machining of a subsequent step. In view of this, the following technical solutions are proposed.

SUMMERY OF THE UTILITY MODEL

The technical problems solved by the utility model are as follows: the processing tool for the high-precision large-size thin-wall parts is provided, the inner holes of the process steps are processed by means of rough processing blank allowance of the parts, the inner holes of the process steps are used as clamping and positioning references for subsequent processing, and clamping production cost such as a process head is not required to be additionally increased; the axial concentric clamping tool is adopted to clamp the parts, so that the technical problems that the high-precision large-size thin-wall parts are easy to deform and the production cost is high in machining are solved.

The technical scheme adopted by the utility model is as follows: the high-precision large-size thin-wall part processing tool comprises a part to be processed; the part is provided with a process step inner hole prefabricated by the rough machining blank allowance finish machining; the inner hole of the process step extends towards the center along the shaft end surface of the part; taking an inner hole of the process step as a positioning reference, and providing an axial gland tool; the axial gland tool is concentric and axially compresses the parts to process the parts.

In the above technical solution, further: the axial gland tool comprises an axial gland tool I, an axial gland tool II and an axial gland tool III; the axial gland tool I, the axial gland tool II and the axial gland tool III are respectively composed of a gland, a pressing plate and screws.

In the above technical solution, further: the gland of the axial gland tooling I is of a thick-wall cylindrical structure, and a central positioning counter bore is concentrically arranged in the center of the gland; the central positioning counter bore is concentrically matched with the outer contour of the inner bore of the process step of the part; a pressing plate of the axial gland tool I axially presses the shaft end face of the outer side of the inner hole of the process step of the part; the pressing plate is provided with a central through hole; and a screw of the axial gland tooling I penetrates through a central through hole of the pressing plate and then concentrically and spirally fits an inner threaded hole in the center of the adaptive connection gland so as to axially compress and fix the part.

In the above technical solution, further: the gland of the axial gland tooling II is of a thick-wall cylindrical structure, and a central positioning counter bore is concentrically arranged in the center of the gland; the central positioning counter bore is concentrically matched with the outer contour of one end of the finished part; a pressing plate of the axial gland tooling II axially presses the shaft end face on the outer side of the inner hole of the technological step of the part; the pressing plate is provided with a central through hole; and a screw of the axial gland tooling II penetrates through a central through hole of the pressing plate and then is screwed in the central inner threaded hole of the adaptive connection gland to axially compress and fix the part.

In the above technical solution, further: a gland of the axial gland tooling III is in a thick-wall cylindrical structure, and a central positioning counter bore is concentrically formed in the center of the gland; the central positioning counter bore is concentrically matched with the outer contour of the end part of the part processed by the part; one side of the gland center positioning counter bore is provided with an axial fastening screw hole; the central line of the axial fastening screw hole is parallel to the central line of the gland at intervals; the pressing plate of the axial gland tooling III is of an L-shaped structure, and the middle part of the horizontal plate body of the pressing plate is provided with an axial through hole; and a screw of the axial gland tooling III penetrates through an axial through hole formed in a pressing plate of the axial gland tooling III and then is screwed into an axial fastening screw hole of the adaptive connection gland so as to axially compress and fix the part.

Compared with the prior art, the utility model has the advantages that:

1. the utility model can accurately process the design reference of thin-wall large-size parts; the part is not clamped by a three-jaw chuck, and the workpiece is axially stressed by an axial gland tool; ensuring that other relevant sizes in the drawing meet the design requirements of the drawing; form and position tolerance and size tolerance in the drawing are ensured; and through the conversion of benchmark, ensure that the axiality deviation of internal thread and hole can satisfy the drawing requirement in the subsequent processing.

2. The inner hole of the process step can play a role of a reinforcing rib; the arrangement of the inner hole of the process step can effectively increase the wall thickness of the inner hole, increase the contact area and play a role of a reinforcing rib while ensuring the size of the inner hole of the process step; the existence of adverse factors such as the surface roughness of the inner hole, the taper of the inner hole, the cylindricity and the like caused by the vibration lines of the inner hole turning, cutter relieving, untimely heat dissipation and the like is avoided; ensuring the production of qualified products meeting the design requirements.

3. The utility model designs the tool by means of the original drawing paper, skillfully processes the inner hole of the technological step by means of the blank allowance of the rough machining part, provides a clamping reference for realizing the subsequent finish machining, does not need to additionally increase the manufacturing cost, and is economical, practical, efficient and reliable.

Drawings

FIG. 1 is a diagram of the process requirements for a high-precision large-size thin-walled part to be processed according to the present invention;

FIG. 2 is a schematic view of the inner hole structure of the process step of the component of the present invention;

FIG. 3 is a schematic structural diagram of a clamping part of an axial gland tool I;

FIG. 4 is a schematic structural diagram of a clamping part of an axial gland tooling II of the utility model;

FIG. 5 is a schematic structural view of a clamping part of an axial gland tool III of the utility model;

FIG. 6 is a process flow diagram of a method according to the present invention;

in the figure: 1-part, 2-step inner hole processing, and 3-axial gland tooling; 3-1 axial gland tooling I, 3-2 axial gland tooling II and 3-3 axial gland tooling III; 301-gland, 302-clamp, 303-screw.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 6 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in figure 1, an inner hole phi 254H6, a phi 300H7, 4 +/-0.025 and M250 multiplied by 1.5-6H internal threads are arranged in a high-precision large-size thin-wall part 1, the coaxiality deviation of the threads and a reference hole is less than or equal to phi 0.025, the parallelism of two end faces of a workpiece is less than or equal to 0.02, and the perpendicularity of the inner hole and a lower end face is less than or equal to 0.015, which are important sizes needing to ensure the processing precision of the high-precision large-size thin-wall part.

The utility model provides a high-precision large-size thin-wall part machining tool which comprises a part 1 to be machined; the part 1 is provided with a process step inner hole 2 prefabricated by rough machining blank allowance finish machining; the inner hole 2 of the technical step extends along the axial end surface of the part 1; the inner hole of the process step plays a role of a reinforcing rib on one hand and a positioning reference on the other hand. Namely, the inner hole 2 of the process step is taken as a positioning reference, and an axial gland tool 3 is arranged; the axial gland tool 3 concentrically and axially compresses the part 1 to machine the part 1.

The axial gland tool 3 comprises an axial gland tool I3-1, an axial gland tool II 3-2 and an axial gland tool III 3-3. The three tools respectively clamp one end of a part, the outline of the middle part of the part and the other end of the part so as to facilitate high-precision machining.

The axial gland tool I3-1, the axial gland tool II 3-2 and the axial gland tool III 3-3 are respectively composed of a gland 301, a pressing plate 302 and a screw 303. The number of components of the three tools is simplified, the structure is simple, the tool is convenient to realize, the clamping is reliable, and the tool is economical and practical.

The gland 301 of the axial gland tooling I3-1 is of a thick-wall cylindrical structure, and a central positioning counter bore is concentrically formed in the center of the gland 301. The central positioning counter bore is concentrically matched with the outer contour of the inner hole 2 of the process step. And (3) positioning and clamping the part 1 by taking the processed process step counter bore 2 as a reference. Namely, the pressure plate 302 of the axial gland tooling I3-1 axially compresses the shaft end surface at the outer side of the inner hole 2 of the part process step; the pressure plate 302 is provided with a central through hole; and a screw 303 of the axial gland tooling I3-1 penetrates through a central through hole of the pressure plate 302 and then concentrically and spirally matches and is matched with a central internal threaded hole of the gland 301 so as to axially compress and fix the part 1.

The gland 301 of the axial gland tooling II 3-2 is of a thick-wall cylindrical structure, and a central positioning counter bore is concentrically formed in the center of the gland 301; the central positioning counter bore is concentrically matched with the outer contour of one end of the part 1 after finish machining. And clamping and positioning the part by taking the outline of one finished end of the part 1 as a reference. Namely, the pressure plate 302 of the axial gland tooling II 3-2 axially compresses the shaft end surface at the outer side of the inner hole 2 of the technological step of the part; the pressure plate 302 is provided with a central through hole; and a screw 303 of the axial gland tooling II 3-2 penetrates through a central through hole of the pressure plate 302 and then is screwed in the central internal threaded hole of the gland 301 in a matching manner so as to axially compress and fix the part 1.

The gland 301 of the axial gland tooling III 3-3 is of a thick-wall cylindrical structure, and a central positioning counter bore is concentrically formed in the center of the gland 301; the central positioning counter bore is concentrically matched with the outer contour of the end part of the part 1 which is processed. And clamping and positioning the part by taking the outline of one finished end of the part 1 as a reference. Namely, one side of the central positioning counter bore of the gland 301 is provided with an axial fastening screw hole; the central line of the axial fastening screw hole is parallel to the central line of the gland 301 at intervals; the pressing plate 302 of the axial gland tooling III 3-3 is of an L-shaped structure, and the middle part of the horizontal plate body of the pressing plate 302 is provided with an axial through hole; and a screw 303 of the axial gland tooling III 3-3 penetrates through an axial through hole formed in the pressure plate 302 of the axial gland tooling III 3-3 and then is screwed in the axial fastening screw hole of the adaptive connection gland 301 so as to axially compress and fix the part 1.

Therefore, the design reference of the thin-wall large-size part can be accurately processed; when the datum hole is machined, the part is not clamped by the three-jaw chuck, so that the part is prevented from being stressed in the radial direction, and the workpiece is stressed in the axial direction through the axial gland tool; only the inner hole of the process step is used as a reference hole to be accurately machined, and other relevant sizes in the drawing can be guaranteed to meet the design requirements of the drawing; the processing procedures shown in fig. 3 to 5; meanwhile, form and position tolerance and size tolerance in the drawing are guaranteed; and through the conversion of different working steps and different positioning references, the coaxiality deviation of the internal thread and the inner hole in subsequent processing can be ensured to meet the drawing requirements.

Meanwhile, the inner hole of the process step can play a role of a reinforcing rib. I.e. the inner bore of the part

The process step inner hole is a large-size inner hole with high precision, the ovality and the roughness of the inner hole of the process step are important factors influencing the precision of a product while the size of the inner hole of the process step is ensured, a small amount of feeding is needed for multiple times during boring, the wall thickness of the inner hole is increased due to the arrangement of the inner hole of the process step, namely a process head, the contact area is increased, and the effect of reinforcing ribs is achieved; therefore, the existence of adverse factors such as vibration lines, cutter back-off, untimely heat dissipation and the like which influence the surface roughness of the inner hole, the taper of the inner hole, the cylindricity and the like during the turning of the inner hole can be effectively avoided in the machining process; the method solves the problem that adverse factors often appear in the processing of large thin-wall workpieces, and ensures that qualified products meeting design requirements can be produced.

Moreover, the tool is designed by means of the original drawing paper, and the manufacturing cost is not required to be additionally increased. In the machining process, in order to meet design requirements, a clamping process head is additionally arranged in a workpiece, and a machining example of an extension head is removed after machining is finished; although the processing method of the process can process qualified products, the processing method aims at the mass production and invisibly increases the production cost for processing manufacturers; the arrangement of the inner hole of the process step, namely the process head, in the figure of the utility model breaks through the conventional processing thought and provides a new reference for the processing thought for producers; skillfully providing a clamping reference for realizing subsequent finish machining by means of blank allowance of rough machining parts; and the production cost is not required to be additionally increased.

According to the method, a process step inner hole 2 (shown in figure 2) extending from the end face of a shaft in a centripetal mode is machined by means of rough machining blank allowance of a part 1, the process step inner hole 2 serves as a subsequent machining clamping positioning reference, and an axial gland tool 3 is used for axially pressing and machining the part (shown in figures 3, 4 and 5) so as to obtain the formed thin-wall part with the required precision requirement.

In production, a method for machining the inner hole 2 of the process step by means of rough machining blank allowance of the part 1 is considered for similar products of high-precision large-size thin-wall parts. Namely, during processing, the inner hole 2 of the craft step with the diameter of 230 multiplied by 15 as shown in fig. 2 is processed in advance, and the inner hole 2 of the craft step is used as a clamping and positioning reference for subsequent processing, so that the subsequent clamping and processing are completed.

The utility model relates to a method for processing a high-precision large-size thin-wall part, which specifically comprises the following steps:

(shown in fig. 6) step S1, machining the inner hole of the technical step: and (3) performing finish machining on the process step inner hole 2 with the end face of the shaft extending centripetally by means of rough machining blank allowance of the part 1.

The inner hole 2 of the process step is used for providing a clamping reference and playing a role of a reinforcing rib.

Step S2, finish turning one end: and (3) concentrically and axially compressing the process step inner hole 2 by using an axial gland tool I3-1 by taking the process step inner hole 2 as a reference, and processing a high-precision process dimension structure required by the other end of the part 1.

The axial gland tooling I3-1 is composed of a gland 301, a pressure plate 302 and screws 303. (as shown in fig. 3), the gland 301 of the axial gland tooling i 3-1 is in a thick-walled cylinder structure, and a central positioning counter bore is concentrically formed in the center of the gland 301. The central positioning counter bore is concentrically matched with the outer contour of the process step inner hole 2 of the part 1. During processing, the gland 301 is used for clamping and positioning the gland 301 on equipment by means of a three-jaw chuck, namely, clamping and positioning of a part are realized. A pressing plate 302 of the axial gland tooling I3-1 axially presses the shaft end face on the outer side of the inner hole 2 of the process step of the part; the pressure plate 302 is provided with a central through hole; and a screw 303 of the axial gland tooling I3-1 penetrates through a central through hole of the pressure plate 302 and then concentrically and spirally matches and is matched with a central internal threaded hole of the gland 301 so as to axially compress and fix the part 1.

For example, step S2: firstly, processing a clamping and positioning reference: clamping the outer circle of phi 304, turning the upper end surface to see light, and finish turning

And phi 230 inner end faces, so that the parallelism of the inner end faces and the outer end faces is less than or equal to 0.015. And taking the machined excircle and end face as positioning references. Adopting a gland tooling I3-1 to finish machining according to the following dimensions: phi 254H6 inner hole, phi 262 outer circle, size 4 + -0.025 and phi 300H7, R3 each major size. It can be found that: in the finish turning step S2, the inner hole, the end face and the outer circle can be turned at the same time, so that the dimensional tolerance is guaranteed, and the form and position tolerance that the perpendicularity of the inner hole and the lower end face is less than or equal to 0.015 is also guaranteed. In the machining process, a pressing plate 302 and a central screw 303 are adopted to fix the part 1 on the gland 301. In the process step, the outer cylindrical end face of the inner hole 2 of the process step is used as a positioning reference, and the axial clamping and positioning effects are achieved for the processing of the main sizes. Because the fixing mode of axial pressing installation is adopted in the process step, the generation of unfavorable factors such as vibration lines, cutter relieving, workpiece deformation and the like generated by turning the inner hole of the thin-walled workpiece can be effectively avoided.

(as shown in fig. 4), step S3, finish turning the outer contour: and (5) taking the inner hole 2 of the process step and the outer contour of the end part of the part processed in the step S2 as a reference, concentrically and axially pressing the part 1 by using an axial gland tool II 3-2, and processing the outer contour of the part 1 to obtain the high-precision process size structure. The axial gland tooling II 3-2 is composed of a gland 301, a pressure plate 302 and screws 303. The gland 301 of the axial gland tooling II 3-2 is of a thick-wall cylindrical structure, and a central positioning counter bore is concentrically formed in the center of the gland 301; the central positioning counter bore is concentrically matched with the outer contour of the end part of the part 1 machined in the step S2.

During processing, the gland 301 is used for clamping and positioning the gland 301 on equipment by means of a three-jaw chuck, namely, the part 1 is clamped and positioned.

A pressing plate 302 of the axial gland tooling II 3-2 axially presses the shaft end face on the outer side of the inner hole 2 of the process step of the part; the pressure plate 302 is provided with a central through hole; and a screw 303 of the axial gland tooling II 3-2 penetrates through a central through hole of the pressing plate 302 and then is screwed in the central internal threaded hole of the adaptive connection gland 301 so as to axially compress and fix the part 1.

It can be seen that: and (3) taking the outer circle and the lower end face of phi 300h7 as references, adopting an axial gland tooling II 3-2, fixedly pressing the upper end face by using a pressure plate 302 and a screw 303, and turning the outer circles phi 252, phi 262, 10, 25 and R5 in sequence to finish the finish machining of the outline dimension of the whole part. In the process step, a fixing mode of axial compression, positioning and clamping is also adopted, and the outer contour end face of the outer cylinder of the outer contour of the part 1 is taken as a positioning reference, and the outer chamfer and the inner chamfer of each end face are sequentially turned. Due to the existence of the inner hole 2 of the process step, the press-fitting contact area is increased, which is equivalent to the action of the reinforcing rib, so that the part 1 is more firmly pressed, and the deformation of the workpiece caused by vibration lines and heat release generated by multiple turning friction between a turning tool and the workpiece is effectively avoided.

(as shown in fig. 5) step S4, finish turning the other end: and (5) taking the high-precision technological dimension structure required by the other end of the part 1 processed in the step S2 as a reference, concentrically and axially pressing the part 1 by using an axial gland tool III 3-3, and processing the high-precision technological dimension structure required by the part at the end where the technological step inner hole 2 is located. The axial gland tooling III 3-3 consists of a gland 301, a pressure plate 302 and a screw 303. The gland 301 of the axial gland tooling III 3-3 is of a thick-wall cylindrical structure, and a central positioning counter bore is concentrically formed in the center of the gland 301; the central positioning counter bore is concentrically matched with the outer contour of the end part of the part 1 machined in the step S2.

During processing, the gland 301 is used for clamping and positioning the gland 301 on equipment by means of a three-jaw chuck, namely, the part 1 is clamped and positioned.

One side of the central positioning counter bore of the gland 301 is provided with an axial fastening screw hole; the central line of the axial fastening screw hole is parallel to the central line of the gland 301 at intervals; the pressing plate 302 of the axial gland tooling III 3-3 is of an L-shaped structure, and the horizontal plate body of the pressing plate 302 is provided with an axial through hole; and a screw 303 of the axial gland tooling III 3-3 penetrates through the axial through hole of the pressing plate 302 and then is screwed with the axial fastening screw hole of the gland 301 so as to axially compress and fix the part 1.

In the step S4, when an internal thread is machined, the axial gland tooling iii 3-3 is used, and three pressing plates 302 and three screws 303 are adopted to uniformly fix the parts 1 on the upper end surface of the phi 300h7 in a circumferential manner, so as to avoid radial stress on the parts 1. In the working procedure, the M250 multiplied by 1.5-6H threads are processed by adopting phi 300H7 excircle positioning or phi 300H7 excircle alignment and using a method of replacing a pressing plate 302; it should be noted that: here, if the 300h7 outer circle is properly matched with the central positioning counter bore of the gland 301, the 300h7 outer circle does not need to be aligned in subsequent processing.

In addition, it should be noted that: although the machining standard of the internal thread is phi 300H7, in the finish turning step S2, the internal hole of phi 254H6 and the external circle of phi 300H7 belong to one-time machining, the coaxiality deviation of the standard internal hole and the threaded hole required in the drawing completely meets the design requirement in the present step, and the machining process only belongs to the conversion of the standard.

From the above description it can be found that: the utility model provides a new processing idea, skillfully utilizes blank allowance of rough processing parts, and provides clamping and positioning references for realizing subsequent finish processing. And the production cost is not required to be additionally increased. Economical and practical, the clamping is reliable and stable, and the precision is high, and the part does not have the deformation.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on differences from other embodiments.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (5)

1. High accuracy jumbo size thin wall parts machining frock, its characterized in that: comprises a part (1) to be processed; the part (1) is provided with a process step inner hole (2) which is prefabricated by rough machining blank allowance finish machining; the inner hole (2) of the process step extends towards the center along the shaft end surface of the part (1); the inner hole (2) of the process step is taken as a positioning reference, and an axial gland tool (3) is arranged; the axial gland tool (3) concentrically and axially compresses the part (1) to process the part (1).

2. The high-precision large-size thin-wall part machining tool according to claim 1, characterized in that: the axial gland tool (3) comprises an axial gland tool I (3-1), an axial gland tool II (3-2) and an axial gland tool III (3-3); the axial gland tool I (3-1), the axial gland tool II (3-2) and the axial gland tool III (3-3) are respectively composed of a gland (301), a pressing plate (302) and a screw (303).

3. The high-precision large-size thin-walled part machining tool according to claim 2, characterized in that: the gland (301) of the axial gland tooling I (3-1) is of a thick-wall cylindrical structure, and a central positioning counter bore is concentrically formed in the center of the gland (301); the central positioning counter bore is concentrically matched with the outer contour of the process step inner hole (2) of the part (1); a pressing plate (302) of the axial gland tooling I (3-1) axially presses the shaft end surface on the outer side of the inner hole (2) of the process step of the part; the pressure plate (302) is provided with a central through hole; a screw (303) of the axial gland tooling I (3-1) penetrates through a central through hole of the pressing plate (302) and then concentrically and spirally matches with a central inner threaded hole of the connection gland (301) to axially compress and fix the part (1).

4. The high-precision large-size thin-wall part machining tool according to claim 2, characterized in that: the gland (301) of the axial gland tooling II (3-2) is of a thick-wall cylindrical structure, and a central positioning counter bore is concentrically formed in the center of the gland (301); the central positioning counter bore is concentrically matched with the outer contour of one end of the part (1) which is subjected to finish machining; a pressing plate (302) of the axial gland tooling II (3-2) axially presses the shaft end face on the outer side of the inner hole (2) of the process step of the part; the pressure plate (302) is provided with a central through hole; and a screw (303) of the axial gland tooling II (3-2) penetrates through a central through hole of the pressing plate (302) and then is screwed in the central internal threaded hole of the gland (301) to be matched and connected so as to axially compress and fix the part (1).

5. The high-precision large-size thin-wall part machining tool according to claim 2, characterized in that: a gland (301) of the axial gland tooling III (3-3) is of a thick-wall cylindrical structure, and a central positioning counter bore is concentrically formed in the center of the gland (301); the central positioning counter bore is concentrically matched with the outer contour of the end part of the part (1) which is processed; one side of the central positioning counter bore of the gland (301) is provided with an axial fastening screw hole; the central line of the axial fastening screw hole is parallel to the central line of the gland (301) at intervals; a pressing plate (302) of the axial gland tooling III (3-3) is of an L-shaped structure, and an axial through hole is formed in the middle of a horizontal plate body of the pressing plate (302); and a screw (303) of the axial gland tooling III (3-3) penetrates through an axial through hole formed in a pressure plate (302) of the axial gland tooling III (3-3) and then is screwed into an axial fastening screw hole in adaptive connection with the gland (301) so as to axially compress and fix the part (1).

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