CN115284009B - Processing method of thin-wall diamond-shaped titanium alloy shell - Google Patents
Processing method of thin-wall diamond-shaped titanium alloy shell Download PDFInfo
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- CN115284009B CN115284009B CN202211129415.XA CN202211129415A CN115284009B CN 115284009 B CN115284009 B CN 115284009B CN 202211129415 A CN202211129415 A CN 202211129415A CN 115284009 B CN115284009 B CN 115284009B
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/20—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring workpiece characteristics, e.g. contour, dimension, hardness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
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- B23Q17/24—Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves
- B23Q17/2452—Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves for measuring features or for detecting a condition of machine parts, tools or workpieces
- B23Q17/2471—Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves for measuring features or for detecting a condition of machine parts, tools or workpieces of workpieces
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Abstract
The invention relates to the field of aircraft shell machining, and particularly discloses a thin-wall diamond-shaped titanium alloy shell machining method, which comprises the following steps of: determining a rough machining reference by three-dimensional scanning, scribing according to a three-dimensional scanning result, aligning and machining a process block reference according to the scribing, performing three-dimensional scanning on the process block reference, and adjusting the machining reference according to a scanning result; rough milling an inner cavity; carrying out three-dimensional scanning again; adjusting a machining reference according to a scanning result, and semi-finishing the appearance of the shell; polishing the inner cavity grid according to the thickness gauge detection wall thickness data; semi-finish milling an inner cavity; performing three-dimensional scanning for the third time, verifying whether the current standard meets the requirement of subsequent semi-finish machining, adjusting the machining standard according to the scanning result, and finishing the appearance of the shell; finish milling an inner cavity, finish milling an end face, finish machining a large end of the shell, and blasting bolt holes and mounting surfaces. The invention solves the problems that the thin-wall diamond titanium alloy processed by the existing processing method has poor wall thickness consistency and affects the stability of the product in the use process.
Description
Technical Field
The invention belongs to the field of aircraft shell machining, and particularly relates to a machining method of a thin-wall diamond-shaped titanium alloy shell.
Background
With the continuous development of aerospace technology, higher requirements are put forward on the performance and reliability of an aircraft, and the design concept of aerospace products is deeply influenced. The shell parts of the flying missile gradually change into a special-shaped structure, and the shell parts have small aerodynamic resistance, large internal volume and light structure weight. The inner and outer surfaces of the special-shaped shell are formed by irregular curved surfaces, and the special-shaped shell has the characteristics of grid structure, thin wall, large taper, poor rigidity and the like. The diamond-shaped shell is of a grid structure, the wall thickness is thin, the rear end frame is of an open structure, the rigidity of the whole structure is poor, the inner cavity belongs to a narrow deep cavity structure, the traditional processing technology is large in deformation, the wall thickness consistency is poor, and the stability of the product in the use process is affected.
Disclosure of Invention
The invention provides a thin-wall diamond-shaped titanium alloy shell processing method, which aims to solve the problems of large processing deformation, poor wall thickness consistency and poor stability of products in the use process of the diamond-shaped titanium alloy shell in the prior art.
The technical scheme of the invention is as follows: a processing method of a thin-wall diamond-shaped titanium alloy shell comprises the following steps:
(1) Preparing materials;
(2) Three-dimensional scanning, namely determining a rough machining reference by three-dimensional scanning, scribing according to a three-dimensional scanning result, aligning and machining a process block reference according to the scribing, performing three-dimensional scanning on the process block reference, and adjusting the machining reference according to a scanning result;
(3) Rough milling the appearance, wherein the unilateral allowance is 3-4mm;
(4) Rough milling an inner cavity, wherein the unilateral allowance is 2-3mm;
(5) Performing three-dimensional scanning again, and verifying whether the current standard meets the requirement of subsequent semi-finishing;
(6) Adjusting a machining reference according to a scanning result, and semi-finishing the appearance of the shell;
(7) Polishing the inner cavity grids according to the thickness data detected by the thickness gauge, and ensuring that the thickness of the skin is more than or equal to 3.5mm;
(8) Semi-finish milling an inner cavity, wherein the unilateral allowance is 1-2mm;
(9) Performing three-dimensional scanning for the third time, verifying whether the current standard meets the requirement of subsequent semi-finish machining, adjusting the machining standard according to the scanning result, and finishing the appearance of the shell;
(10) Finish milling an inner cavity, finish milling an end face, finish machining a large end of the shell, and blasting bolt holes and mounting surfaces.
The rough milling appearance parameters in the step (3) are that the spindle rotating speed is 1500r/min, the feeding rate is 800mm/min, the cutting depth is 0.5mm, and the processing steps are 1mm.
After the rough milling of the inner cavity is finished, carrying out natural frequency vibration aging treatment on the inner cavity subjected to rough milling for 1 time, wherein the duration is 50min; natural aging treatment is carried out for 1 time and 3 days.
The specific parameters of the appearance of the semi-finished shell in the step (6) are 1mm for single-side allowance, the rotating speed of a main shaft is 1500r/min, the feeding rate is 800mm/min, the cutting depth is 0.4mm, and the processing step distance is 1mm.
The inner cavity which is semi-finish-milled in the step (8) is subjected to natural frequency vibration aging treatment for 1 time for 50min; natural aging treatment is carried out for 1 time and 2 days.
The specific parameters of the appearance of the finished shell in the step (9) are that the spindle rotating speed is 1500r/min, the feeding rate is 800mm/min, the cutting depth is 0.3mm, and the processing step distance is 0.4mm.
After finishing the appearance of the shell in the step (9), detecting the wall thickness by a thickness gauge and ensuring the thickness of the skin
The specific parameters of the inner cavity and the end face of the finish milling in the step (10) are that the spindle rotating speed is 2500r/min, the feeding rate is 300mm/min, and the cutting depth is 0.15mm.
The large end of the finished shell, the explosion bolt hole and the mounting surface are positioned and supported by adopting a shell rapid clamping and positioning support tool; the quick clamping, positioning and supporting tool for the shell comprises a supporting base, positioning screws and positioning pins, wherein the positioning screws are arranged on the supporting base, and the positioning pins are arranged on the side wall of the supporting base.
And (3) finely milling the inner cavity and the finely milled end face in the step (10) by adopting a micro right-angle milling head.
The invention has the beneficial effects that:
the invention discloses a processing method of a thin-wall diamond-shaped titanium alloy shell, which comprises the following steps: preparing materials; three-dimensional scanning, namely determining a rough machining reference by three-dimensional scanning, scribing according to a three-dimensional scanning result, aligning and machining a process block reference according to the scribing, performing three-dimensional scanning on the process block reference, and adjusting the machining reference according to a scanning result; rough milling the appearance; unilateral allowance is 3-4mm; rough milling an inner cavity, wherein the unilateral allowance is 2-3mm; performing three-dimensional scanning again, and verifying whether the current standard meets the requirement of subsequent semi-finishing; adjusting a machining reference according to a scanning result, and semi-finishing the appearance of the shell; polishing the inner cavity grids according to the thickness data detected by the thickness gauge, and ensuring that the thickness of the skin is more than or equal to 3.5mm; semi-finish milling an inner cavity, wherein the unilateral allowance is 1-2mm; performing three-dimensional scanning for the third time, verifying whether the current standard meets the requirement of subsequent semi-finish machining, adjusting the machining standard according to the scanning result, and finishing the appearance of the shell; the processing standard is determined through multiple three-dimensional scanning, so that the processing is accurate, and the problems that the diamond titanium alloy shell in the prior art is large in processing deformation and poor in wall thickness consistency and affects the stability of the product in the use process are solved.
Drawings
FIG. 1 is a schematic view of a thin-walled diamond-shaped titanium alloy shell to be machined in accordance with the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view of a quick clamping, positioning and supporting tool for a shell according to the present invention;
FIG. 4 is a schematic view of a micro right angle milling head according to the present invention;
fig. 5 is a side view of fig. 4.
Detailed Description
The present invention will be described in more detail with reference to the following examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The invention discloses a processing method of a thin-wall diamond-shaped titanium alloy shell, which comprises the following steps:
(1) Preparing materials; (2) Three-dimensional scanning, namely determining a rough machining reference by three-dimensional scanning, scribing according to a three-dimensional scanning result, aligning and machining a process block reference according to the scribing, performing three-dimensional scanning on the process block reference, and adjusting the machining reference according to a scanning result; (3) rough milling the profile; unilateral allowance is 3-4mm; (4) rough milling an inner cavity, wherein the unilateral allowance is 2-3mm; (5) Performing three-dimensional scanning again, and verifying whether the current standard meets the requirement of subsequent semi-finishing; (6) Adjusting a machining reference according to a scanning result, and semi-finishing the appearance of the shell; (7) Polishing the inner cavity grids according to the thickness data detected by the thickness gauge, and ensuring that the thickness of the skin is more than or equal to 3.5mm; (8) semi-finish milling an inner cavity, wherein the unilateral allowance is 1-2mm; (9) Performing three-dimensional scanning for the third time, verifying whether the current standard meets the requirement of subsequent semi-finish machining, adjusting the machining standard according to the scanning result, and finishing the appearance of the shell; (10) Finish milling an inner cavity, finish milling an end face, finish machining a large end of the shell, and blasting bolt holes and mounting surfaces.
The rough milling appearance parameters in the step (3) are that the spindle rotating speed is 1500r/min, the feeding rate is 800mm/min, the cutting depth is 0.5mm, and the processing steps are 1mm. The tool has optimal use efficiency, and the deformation and the surface roughness of the machined workpiece meet the subsequent machining requirements.
After the rough milling of the inner cavity is finished, carrying out natural frequency vibration aging treatment on the inner cavity subjected to rough milling for 1 time, wherein the duration is 50min; and (3) carrying out natural aging treatment for 1 time for 3 days, and fully releasing casting and machining residual stress.
The specific parameters of the appearance of the semi-finished shell in the step (6) are 1mm for single-side allowance, the rotating speed of a main shaft is 1500r/min, the feeding rate is 800mm/min, the cutting depth is 0.4mm, and the processing step distance is 1mm. The cutter has optimal use efficiency, and reduces the deformation of the machining resistance of the workpiece.
The inner cavity which is semi-finish-milled in the step (8) is subjected to natural frequency vibration aging treatment for 1 time for 50min; and (3) carrying out natural aging treatment for 1 time for 2 days, and fully releasing casting and machining residual stress.
The specific parameters of the appearance of the finish machining shell in the step (9) are that the rotating speed of a main shaft is 1500r/min, the feeding rate is 800mm/min, the cutting depth is 0.3mm, the machining step distance is 0.4mm, the service efficiency of the cutter is optimal, the machining resistance deformation of a workpiece is controlled, and the requirements of the surface size and the surface roughness of the workpiece are ensured.
After finishing the appearance of the shell in the step (9), detecting the wall thickness by a thickness gauge and ensuring the thickness of the skinThickness gauge detects wall thickness and polishes inner chamber net, guarantees skin thickness +.>
The specific parameters of the inner cavity and the end face of the finish milling in the step (10) are that the spindle rotating speed is 2500r/min, the feeding rate is 300mm/min, the cutting depth is 0.15mm, the service efficiency of the cutter is optimal, the deformation of the machining resistance of the workpiece is controlled, and the requirements of the surface size and the surface roughness of the workpiece are ensured.
The explosion bolt hole and the mounting surface of the large end of the finish machining shell are positioned and supported by the shell quick clamping and positioning support tool, the alignment tool is accurately finished, the pin hole positions the workpiece, quick clamping and alignment are achieved, the finish machining shell is suitable for batch production and machining, meanwhile, the inner cavity of the workpiece is supported, the molded surface of the workpiece is accurate, and the shape and position tolerance of the relevant size after machining is ensured to be qualified.
The quick clamping, positioning and supporting tool for the shell comprises a supporting base, positioning screws and positioning pins, wherein the positioning screws are arranged on the supporting base, and the positioning pins are arranged on the side wall of the supporting base.
Example 1
The whole thin-wall diamond-shaped titanium alloy shell to be processed in the embodiment is of a diamond cone structure, the total length a is 445mm, the front end of the shell is of a flange structure, the rear end of the shell is of an open structure, the long axis dimension b is 746.3mm, the short axis dimension c is 349.4mm, the inner cavity is of a grid rib structure, and the typical wall thickness is 2mm.
The specific steps involved in the invention include: determining a rough machining reference by three-dimensional scanning, performing three-dimensional laser scanning detection on the appearance of the inner cavity of the shell, considering the grid of the inner cavity of the shell and the distribution condition of the appearance allowance, and performing preliminaryDetermining a rough machining reference; marking according to the three-dimensional scanning result, leveling process block references A, B, C, D on two sides of the shell, determining a center reference, marking a shell height direction cut-off line, marking center cross lines of front and rear end faces of the shell, machining the cut-off lines of long and short axes of the front and rear end faces, verifying the allowance of each machining characteristic of the shell, and aligning and machining the process block references according to the marking; performing three-dimensional scanning according to the process block standard, and adjusting the processing standard according to the scanning result; rough milling the appearance, wherein the single-side allowance is 3mm, the spindle rotating speed is 1500r/min, the feed rate is 800mm/min, the cutting depth is 0.5mm, and the processing step distance is 1mm; rough milling an inner cavity, and customizing a micro right-angle milling head for machining, wherein the unilateral allowance is 2mm; natural frequency vibration aging treatment is carried out for 1 time for 50min; natural aging for 1 time for 3 days; three-dimensional scanning, namely verifying whether the current standard meets the requirement of subsequent semi-finishing; adjusting a machining standard according to a scanning result, semi-finishing the shell shape, enabling the single-side allowance to be 1mm, enabling the spindle rotation speed to be 1500r/min, enabling the feed rate to be 800mm/min, enabling the cutting depth to be 0.4mm, and enabling the machining step distance to be 1mm; polishing the inner cavity grids according to the thickness data detected by the thickness gauge, and ensuring that the thickness of the skin is more than or equal to 3.5mm; semi-finish milling an inner cavity, and customizing a micro right-angle milling head for machining, wherein the unilateral allowance is 1m; natural frequency vibration aging treatment is carried out for 1 time for 50min; natural aging for 1 time for 2 days; three-dimensional scanning, namely verifying whether the current standard meets the requirement of subsequent semi-finishing; adjusting a machining reference according to a scanning result, finely machining the appearance of the shell to a final size, wherein the rotating speed of a main shaft is 1500r/min, the feeding rate is 800mm/min, the cutting depth is 0.3mm, and the machining step distance is 0.4mm; polishing the inner cavity grid according to the thickness data detected by the thickness gauge, and ensuring the thickness of the skinFinely milling the inner cavity and the end face to the final size, and customizing a micro right-angle milling head for processing, wherein the rotating speed of a main shaft is 2500r/min, the feeding rate is 300mm/min, and the cutting depth is 0.15mm; finishing the big end 6-/of the shell>An explosion bolt hole and a phi 31 mounting surface are designed to be a quick clamping, positioning and supporting tool for a shell,ensuring that the dimensional tolerance of the final product is qualified.
The shell clamping, positioning and supporting tool comprises a supporting base 1, positioning screws 2 and positioning pins 3, wherein the positioning screws are arranged on the supporting base, and the positioning pins are arranged on the side wall of the supporting base. The tool uses 2-M8 threaded holes at the large end of the shell and the mounting surface of the ignition device in the inner cavity of the large endAnd M6 step holes are used for positioning, supporting the inner shape of the large end of the shell, and finish milling processing is used for ensuring the position degree of each mounting surface hole of the inner cavity of the large end. The rough milling inner cavity, the finish milling inner cavity and the finish milling end face adopt the micro right angle milling head to finish milling, so that the processing requirement is met, and the processing quality and efficiency are improved. The distance between the nearest positions of the adjacent installation surfaces of the inner cavity of the shell and the machining is only 62.5mm, the deepest part of the machining deep hole is 175mm, the machining belongs to typical narrow deep cavity machining, a special microminiature right angle milling head is used for carrying out finish machining on the installation groove of the guide block of the inner cavity of the shell, and a specific microminiature angle head is shown in figure 4. The angle head selects BT50 to drive the knife handle, the connection type of the angle head driving rod and the knife handle of the processing machine tool is consistent, the length of the angle head driving rod is 210mm (more than 175mm of the processing depth), the thickness is 47mm (less than 62.5mm of the width of the processing area), and the extension length of the processing knife is 8mm, so that the finish machining requirement can be met. When the milling cutter is used, the cutter handle of the angle head BT50 is connected with the main shaft of the machine tool, the non-rotating module on the angle head is matched and fixed with the non-rotating part on the machine tool through the locating pin, so that the initial circumferential direction (namely the negative Y-axis direction) of the angle head around the main shaft of the machine tool is determined, and milling is performed according to the set processing direction. The fine milling is performed by adopting the micro right-angle milling head provided by the invention, so that the processing requirement is met, the operation is convenient, and the working efficiency is obviously improved.
The shell clamping, positioning and supporting tool has the functions of accurately positioning the positions of all parts and is used for: firstly, the supporting base 1 is placed on a machine tool workbench to be fixed, the straightening alignment straight edge is within 0.01mm, 2 positioning screws 2 are placed in two pin holes of the supporting base 1, two pin holes at the large end of a workpiece are aligned and embedded with the positioning screws 2, no angle is required, the end face of the large end of the workpiece is attached to the step face of the supporting base 1, and 4 positioning pins 3 enter from the small opening of the workpiece and are inserted into platform pin holes at the inner cavity 4 of the workpiece, so that the limiting and fixing functions are achieved.
Example 2
The present embodiment differs from embodiment 1 in that the single-side margin of the rough milling appearance is 4mm; rough milling the unilateral allowance of the inner cavity by 2mm; and 3mm of unilateral allowance of the semi-finish milling inner cavity.
Example 3
The present embodiment differs from embodiment 1 in that the single-side margin of the rough milling appearance is 3.5mm; rough milling the unilateral allowance of the inner cavity by 2.5mm; the unilateral allowance of the semi-finish milling inner cavity is 2.5mm.
The technological difficulty in the prior art is that the wall thickness of the metal shell is onlyThe wall thickness is thinner, and the big end of the shell is of an open structure, and no ribs or flanges are used for supporting, so that the overall strength of the product is very weak. In the processing process, the shell is extremely easy to deform, so that the wall thickness is out of tolerance, and meanwhile, the shell is easy to be closed up at the large end, so that the long and short axis dimensions of the large end are out of tolerance.
The inner cavity of the large end of the shell is provided with a plurality of mounting holes, the relative position degree requirement is strict, and the shape and position tolerance at the most severe position is only 0.05. Meanwhile, the shell is easy to deform in the processing process, so that the position degree of each hole is out of tolerance.
From the marking of the casting to the rough machining, the semi-finishing machining and the finishing machining of the shell, how to determine and adjust the machining standard is considered, and the wall thickness is ensured to meet the requirements. Meanwhile, the shell is deformed in the processing process, and how to determine and adjust the alignment becomes a difficult problem.
The method solves the problem that the method decomposes the external surface machining flow of the shell, and is mainly divided into rough machining (single-side allowance of 3 mm), semi-finishing (single-side allowance of 1 mm) and finishing, and internal stress of the shell is fully released by removing the allowance for a plurality of times, so that the contour degree and the wall thickness of the shell after finishing meet the requirements. Meanwhile, an aging process is added in the rough, semi-finish and finish machining processes, and stress relief aging is performed in a mode of combining vibration aging and natural aging, so that internal stress release of the shell is fully ensured.
And after the casting is put into a factory, scribing is carried out through three-dimensional scanning data, and a process block standard is processed through scribing and horizontal boring. In order to ensure the accuracy of the machining reference, three-dimensional scanning is performed again after the rough machining reference. And after rough machining and semi-finishing of the shell, three-dimensional scanning is carried out to determine that the machining standard of the process block is correct. Meanwhile, a point inspection program is compiled on the machine tool, and the wall thickness of each grid of the shell is verified to meet the requirements.
The technical scheme of the thin-wall diamond-shaped titanium alloy shell disclosed by the invention can greatly improve the processing efficiency and ensure the product quality. The shape processing efficiency and the processing stability of the thin-wall diamond-shaped titanium alloy shell are improved, the processed thin-wall diamond-shaped titanium alloy shell is small in deformation, and the uniformity of wall thickness can be ensured.
The specific protection scope of the present invention is not limited to the above explanation, and any simple replacement or modification within the scope of the technical idea disclosed in the present invention and according to the technical scheme of the present invention should be within the protection scope of the present invention.
Claims (1)
1. A processing method of a thin-wall diamond-shaped titanium alloy shell is characterized in that the structure to be processed by the processing method is that the whole shell of the thin-wall diamond-shaped titanium alloy shell is of a diamond cone structure, the total length is 445mm, the front end of the shell is of a flange structure, the rear end of the shell is of an open structure, the long axis is 746.3mm, the short axis is 349.4mm, the inner cavity is of a grid rib structure, and the wall thickness is 2mm; three-dimensional scanning is used for determining a rough machining reference, three-dimensional laser scanning detection is carried out on the appearance of the inner cavity of the shell, the grid and appearance allowance distribution conditions of the inner cavity of the shell are considered, and the rough machining reference is primarily determined; marking according to the three-dimensional scanning result, leveling process block references on two sides of the shell, determining a center reference, marking a shell height direction stop line, marking a shell front end surface center cross line, a shell rear end surface center cross line, front end surface long and rear end surface short shaft processing stop lines, verifying the allowance of each processing characteristic of the shell, and aligning and processing the process block reference according to marking; performing three-dimensional scanning according to the process block standard, and adjusting the processing standard according to the scanning result; rough milling the appearance, wherein the single-side allowance is 3mm, the spindle rotating speed is 1500r/min, the feed rate is 800mm/min, the cutting depth is 0.5mm, and the processing step distance is 1mm; rough milling an inner cavity, machining a micro right-angle milling head, and enabling single-side allowance to be 2mm; natural frequency vibration aging treatment is carried out for 1 time for 50min; natural aging for 1 time for 3 days; three-dimensional scanning, namely verifying whether the current standard meets the requirement of subsequent semi-finishing; adjusting a machining standard according to a scanning result, semi-finishing the shell shape, enabling the single-side allowance to be 1mm, enabling the spindle rotation speed to be 1500r/min, enabling the feed rate to be 800mm/min, enabling the cutting depth to be 0.4mm, and enabling the machining step distance to be 1mm; polishing the inner cavity grids according to the thickness data detected by the thickness gauge, and ensuring that the thickness of the skin is more than or equal to 3.5mm; semi-finish milling an inner cavity, machining a micro right-angle milling head, and enabling single-side allowance to be 1m; natural frequency vibration aging treatment is carried out for 1 time for 50min; natural aging for 1 time for 2 days; three-dimensional scanning, namely verifying whether the current standard meets the requirement of subsequent semi-finishing; adjusting a machining reference according to a scanning result, finely machining the appearance of the shell to a final size, wherein the rotating speed of a main shaft is 1500r/min, the feeding rate is 800mm/min, the cutting depth is 0.3mm, and the machining step distance is 0.4mm; polishing the inner cavity grids according to the thickness data detected by the thickness gauge, and ensuring the thickness of the skin to be 2mm; finely milling the inner cavity and the end face to the final size, adopting a micro right-angle milling head for processing, wherein the rotating speed of a main shaft is 2500r/min, the feeding rate is 300mm/min, and the cutting depth is 0.15mm; the large end of the finished shell is provided with an explosion bolt hole and a mounting surface, and a shell quick clamping and positioning support tool is adopted to ensure that the size tolerance of the final product is qualified; the used shell clamping, positioning and supporting tool comprises a supporting base, positioning screws and positioning pins, wherein the supporting base is provided with the positioning screws, the positioning pins are arranged on the side wall of the supporting base, the tool supports the inner shape of the large end of the shell through a large end threaded hole of the shell, and finish milling ensures the position degree of each mounting surface hole of the inner cavity of the large end; the rough milling inner cavity, the finish milling inner cavity and the finish milling end face adopt a micro right angle milling head to finish milling, so that the processing requirement is met, the processing quality and efficiency are improved, the adopted micro right angle milling head is only 62.5mm away from the nearest position of the shell inner cavity adjacent to the mounting surface for processing, the deepest position of a processed deep hole is 175mm, the narrow deep cavity processing is realized, and the micro right angle milling head is used for finish processing of a shell inner cavity guide block mounting groove; the angle head selects a driving knife handle, the connection type of the angle head and the knife handle of the processing machine tool is consistent, the length of a transmission rod of the angle head is 210mm, the thickness is 47mm, and the extension length of a processing cutter is 8mm, so that the finish machining requirement can be met; when the angle head tool is used, the tool handle of the angle head is connected with the main shaft of the machine tool, and the non-rotating module on the angle head is matched and fixed with the non-rotating part on the machine tool through the locating pin, so that the initial circumferential direction of the angle head around the main shaft of the machine tool is determined.
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