CN113601108A - Processing method of double-sided large-opening variable-thickness titanium alloy thin-wall shell - Google Patents
Processing method of double-sided large-opening variable-thickness titanium alloy thin-wall shell Download PDFInfo
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Abstract
The invention provides a method for processing a double-sided large-opening variable-thickness titanium alloy thin-wall shell, which comprises the following steps of: designing a blank structure after process flanging and machining allowance are added according to the specific structure and size of the double-sided large-opening variable-thickness titanium alloy thin-wall shell; processing a blank by adopting a die assembly stamping forming mode; a process flanging of the blank is processed by a numerical control processing center and is used as a reference for subsequent clamping and fixing; clamping a shell blank, and turning an inner molded surface of the shell and a lower plane of a process flanging to form an intermediate shell; clamping the intermediate shell, and turning the outer molded surface of the shell; and clamping the top of the shell, turning the butt seam allowance of the shell and cutting off the butt seam allowance to finish the whole finish machining of the titanium alloy thin-wall shell. The processing method effectively solves the problems that the double-sided large-opening variable-thickness titanium alloy thin-wall shell is difficult to clamp, thin in wall and easy to vibrate and deform in the processing process, and realizes the precise processing of the titanium alloy thin-wall shell.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a machining method of a double-sided large-opening variable-thickness titanium alloy thin-wall shell.
Background
At present, in the field of commercial aerospace, along with the increasing requirements of various aircrafts, propellers and fuel cabins on maneuverability, load capacity and maximum capacity, the structure of the aircraft also puts higher requirements on light weight and high strength. The titanium alloy thin-wall shell with variable thickness has light weight and high strength due to the material properties and the structural characteristics of variable thickness, and is increasingly applied to the field of aerospace.
However, the parts have the difficulties of variable thickness, ultrathin wall, high precision and the like, and are difficult to process, and meanwhile, due to the structural characteristics of large openings on the two sides of the parts, the structural rigidity of the parts is further reduced, the parts are easy to deform in the processing process, and the processing manufacturability is poor. Therefore, the processing manufacturability problem of the variable-thickness thin-wall titanium alloy shell always puzzles the large-scale popularization and application of the variable-thickness thin-wall titanium alloy shell in the field of aerospace.
Disclosure of Invention
The invention provides a processing method of a double-sided large-opening variable-thickness titanium alloy thin-wall shell, aiming at the problems that the double-sided large-opening variable-thickness titanium alloy thin-wall shell is easy to deform, has high processing difficulty, has high wall thickness precision and the like, can effectively control the vibration and deformation of the double-sided large-opening variable-thickness titanium alloy thin-wall shell in the processing process, effectively solves the problems that the double-sided large-opening variable-thickness titanium alloy thin-wall shell is difficult to clamp, has thin wall and is easy to vibrate and deform in the processing process, and realizes the precision processing of the titanium alloy thin-wall shell.
The technical scheme provided by the invention is as follows:
a processing method of a double-sided large-opening variable-thickness titanium alloy thin-wall shell comprises the following steps:
step 1, designing a blank structure with process flanging and machining allowance added according to the specific structure and size of a double-sided large-opening variable-thickness titanium alloy thin-wall shell; the double-sided large-opening thin-wall shell is of a sphere-like structure, an opening structure is processed at the small end of the sphere-like structure, and the large end of the sphere-like structure is an opening formed at the outer edge of the sphere-like structure; the technological flange in the blank structure is of an annular flat plate structure; a fillet transition is added between the thin-wall shell main body structure in the blank structure and the process flanging, and a linear section process extension is added between the outer edge of the thin-wall shell main body structure and the fillet;
step 2, processing the blank by adopting a die assembly stamping forming mode according to the blank structure designed in the step 1;
step 3, processing a technological flanging of the blank by using a numerical control processing center, wherein the technological flanging comprises an upper plane, a lower plane and an outer circular surface of the technological flanging, and is used as a reference for subsequent clamping and fixing, and simultaneously, processing a through hole for clamping and fixing on the technological flanging;
step 4, clamping a shell blank, and turning the inner molded surface of the shell and the lower plane of the process flanging to form an intermediate shell;
step 5, clamping the intermediate shell formed in the step 4, and turning the outer molded surface of the shell;
and 6, clamping the top of the shell, turning and machining the butt seam allowance of the shell and cutting off the butt seam allowance to finish the whole finish machining of the titanium alloy thin-wall shell.
According to the processing method of the double-sided large-opening variable-thickness titanium alloy thin-wall shell, provided by the invention, the following beneficial effects are achieved:
the invention provides a processing method of a double-sided large-opening variable-thickness titanium alloy thin-wall shell, aiming at the problems that the double-sided large-opening variable-thickness titanium alloy thin-wall shell is easy to deform, the processing difficulty is high, the wall thickness precision is high and the like.
Drawings
FIG. 1 is a schematic structural diagram of a double-sided large-opening variable-thickness titanium alloy thin-wall shell;
FIG. 2 is a schematic view of a designed blank structure after adding process flanging and machining allowance;
FIG. 3 is a schematic view of the intermediate shell and features such as the process flange;
fig. 4 is a schematic view of the mating stop of the housing.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The invention provides a method for processing a double-sided large-opening variable-thickness titanium alloy thin-wall shell, which comprises the following steps of:
step 1, designing a blank structure with process flanging and machining allowance added according to the specific structure and size of the double-sided large-opening variable-thickness titanium alloy thin-wall shell as shown in figure 1 and as shown in figure 2.
In one embodiment, the double-sided large-opening thin-walled shell is of a sphere-like structure, the small end of the sphere-like structure is provided with an opening structure, and the large end is an opening (butt seam) formed at the outer edge of the sphere-like structure.
The double-sided large-opening thin-wall shell is made of TC4 or TA15 titanium alloy.
The outer diameter of the large-end opening of the double-sided large-opening thin-wall shell is 400-800 mm, the outer diameter of the small-end opening of the double-sided large-opening thin-wall shell is 50-300 mm, and the height of the shell is 200-280 mm.
The wall thickness variation range of the double-sided large-opening thin-wall shell is between 1 mm and 3mm, and the double-sided large-opening thin-wall shell gradually thickens or thins from a large end to a small end, or is thick at two ends and thin in the middle, or is thick at two ends and thick in the middle, or is locally variable in thickness and the like.
In one embodiment, the blank structure is formed with a machining allowance in both the inner and outer profiles.
In an embodiment, as shown in fig. 3, in the blank structure, rounded corners R15-R25 are added between the thin-wall shell main body structure and the process flanging for transition, and a linear section process extension amount of 8-15mm is added between the outer edge of the thin-wall shell main body structure and the rounded corners, so that on one hand, fine machining of the butt joint seam allowance and subsequent cutting are facilitated, on the other hand, wrinkles caused by rounded corner transition are reduced, and meanwhile, size measurement of the inner diameter of the quasi-spherical surface is facilitated. The thin-wall shell main body structure refers to a blank part of the titanium alloy thin-wall shell with a large opening and variable thickness on the two sides of the corresponding structural part.
In one embodiment, the technical flanging is of an annular flat plate structure and is used for clamping fixation and reference transmission during processing of inner and outer molded surfaces of the thin-wall shell; the thickness of the process flanging is 6-10 mm, the rigidity of the part is guaranteed, the thickness is reduced as much as possible, and the machining allowance is reduced.
And 2, processing the blank by adopting a die assembly hot stamping forming mode according to the blank structure designed in the step 1, wherein the processed blank is shown in figure 2.
In one embodiment, the matched-die hot stamping forming is implemented by using a forming female die and a forming male die, wherein the forming female die is provided with a concave surface structure which is consistent with the outer surface of the blank structure and is used for forming the outer surface of the shell blank structure; the forming male die is provided with a convex surface structure consistent with the inner profile of the blank structure and used for forming the inner profile of the blank structure. The die assembly hot stamping forming mode, the forming female die and the forming male die realize the accurate forming of the blank structure and ensure the initial precision of the thin-wall shell structure.
In one embodiment, the process method for matched-die hot stamping forming comprises the following steps: according to the material characteristics of the blank and considering the critical point of the plastic deformation of the blank, firstly, preheating and insulating the adopted forming female die and the forming male die to 550-700 ℃, and insulating for 0.5-2 h; due to the fact that the height of the shell part is high, when the shell part is formed by adopting the flat plate hot stamping, the depth is deep, if the shell part is formed by adopting the flat plate hot stamping, the problems of pulling crack, wrinkle, internal hole and the like are prone to occurring, through a large number of tests, two times of hot stamping forming are determined, the depth of the first hot stamping is too half, the shell part is subjected to heat preservation at the temperature of 550-700 ℃ for 0.5-1 h, then the second hot stamping is carried out until the size of a required blank shell is reached, and the shell part is subjected to heat preservation at the temperature of 550-700 ℃ for 10-30 min. After two times of hot stamping forming, the blank structure has no problems of tensile crack, wrinkle, internal hole and the like, and the forming mode and the result provided by the analog simulation of the process of the flat hot stamping forming are matched.
And 3, processing the technological flanging of the blank by adopting a numerical control processing center, and taking the technological flanging as a reference for subsequent clamping and fixing.
In one embodiment, the technical flanging for processing the blank comprises an upper plane, a lower plane and an outer circular surface for processing the technical flanging, and a through hole for clamping and fixing is processed on the technical flanging.
In one embodiment, when the process flanging of the blank is processed, the thickness removal amount of the upper plane and the lower plane of the process flanging does not exceed 1/5 of the residual thickness, and the structural strength of the process flanging is strengthened to the maximum degree while the flatness of the upper plane and the lower plane of the process flanging is ensured; when the outer circular surface of the technological flange is machined, alignment needs to be carried out according to the inner spherical surface of the blank structure, the machined outer circular surface of the technological flange and the inner spherical surface of the part blank are ensured to be coaxial, and the reference of the inner spherical surface of the blank structure is transmitted to the outer circular surface of the technological flange.
And 4, clamping the shell blank, and turning the inner molded surface of the shell and the lower plane of the process flanging to form the intermediate shell.
In one implementation mode, a first clamping tool is adopted for clamping the shell blank, the first clamping tool is provided with an annular shell structure for fixing a technological flanging of the blank structure, the annular shell structure comprises an annular plane structure and an annular ring located at the edge of the annular plane structure, the annular plane structure is used for being matched with the upper plane of the technological flanging, the annular ring is used for being matched with the outer circular surface of the technological flanging, and the annular shell structure and the technological flanging are fixed through a threaded connecting piece penetrating through the annular shell structure of the first clamping tool and the threaded connecting piece.
Furthermore, the flatness of the molded surface of the annular plane structure of the first clamping tool and the flatness of the upper plane of the technological flanging of the blank structure are both superior to 0.05.
In one embodiment, the process of turning the inner profile of the shell comprises: according to the alignment of the outer circular surface of the process flanging, the lower plane, the fillet, the process extension amount and the inner profile of the shell of the process flanging are synchronously and continuously turned, and the inner profile of the shell is not easy to measure because the inner profile of the shell is a space profile, so that the lower plane, the fillet, the process extension amount and the inner profile of the shell of the process flanging are continuously formed by a one-cut forming method. The inner ring surface close to the inner side is only turned during turning of the lower plane, so that an inner edge line is formed at the edge of the lower plane close to the inner ring surface, the accurate reference of the inner surface of the shell is transferred to the inner edge line of the lower plane of the process flanging and the process extension, the size of the inner surface of the shell can be reflected by measuring the size of the inner edge line of the lower plane of the process flanging and the size of the process extension, and the size accuracy of the part can be more accurately ensured.
And 5, clamping the intermediate shell formed in the step 4, and turning the outer molded surface of the shell.
In one embodiment, the intermediate shell formed in step 4 is clamped by a second clamping tool, the second clamping tool has a planar shell structure for fixing the technological flange of the blank structure and a male die structure for supporting the inner profile of the shell, the male die structure is respectively used for being matched with the lower plane of the technological flange and the inner profile of the shell, and the planar structure of the shell of the second clamping tool and the threaded connecting piece of the technological flange are arranged in a penetrating manner to fix the two.
Furthermore, the flatness of the molded surface of the planar shell structure of the second clamping tool and the flatness of the lower plane of the technological flanging of the blank structure are both superior to 0.05.
In one embodiment, the process of turning the outer profile of the shell comprises: and (4) aligning the shell through the inner edge line of the lower plane of the process flanging processed in the step (4), and compiling a numerical control turning program of the outer profile of the shell according to the curve profile of the outer profile of the shell, so as to accurately process the outer profile of the shell. The reference of the inner profile of the shell is accurately transmitted to the outer profile of the shell through the inner edge line of the lower plane of the technical flanging, and therefore higher spatial position accuracy of the inner profile and the outer profile of the shell is guaranteed. Meanwhile, when the outer profile of the shell is turned, cutting parameters need to be strictly controlled, cutting amount is reduced, so that the elastic cutter back-off phenomenon caused by the thin wall of the shell in the machining process is prevented, the rotating speed of a lathe spindle is set to be not more than 50r/min, the radial feed amount is not more than 0.2mm per cutter, meanwhile, when the last cutter is machined, the wall thickness of the shell is measured point by adopting an ultrasonic wall thickness meter after each cutting, the wall thickness is compared with a theoretical value required by design, and the feed amount of the next cutter is properly adjusted and compensated according to the difference between the wall thickness and the theoretical precision, so that the final wall thickness precision requirement of the shell is ensured.
And 6, clamping the top of the shell, turning and machining a butt seam allowance (shown in figure 4) of the shell, and cutting off the shell to finish the whole finish machining of the titanium alloy thin-wall shell.
In one embodiment, a third clamping tool is used for clamping the top of the shell, the third clamping tool has a curved surface structure for fixing the outer profile of the small end of the shell and is used for matching with the outer profile of the small end of the shell, and the third clamping tool, the shell and the second clamping tool are fixed together through threaded connecting pieces penetrating through the third clamping tool and the second clamping tool. Through this third clamping frock, with the firm fixing on the second clamping frock of casing tip, when the butt joint tang of lathe work casing cuts off, can guarantee the firm support of casing, can not drop or vibrate because of cutting off, lead to the tang to destroy or the size is out of tolerance.
In one embodiment, the process method for turning the butt seam of the shell comprises the following steps: because the width of the butt seam allowance of the shell is not more than 2mm and is very narrow, blades with the width less than 2mm are few in the market, a tool with the extremely narrow width needs to be specially customized, the tool is extremely narrow and weak in rigidity, meanwhile, the machining precision is poor due to the difficult cutting property of the titanium alloy material, and when the butt seam allowance of the shell is machined, the process extension amount of 8-15mm is preset, so that the machining width of the butt seam allowance can be widened when the butt seam allowance is machined, the part with the width greater than 2mm falls on the process extension amount, and after the butt seam allowance is machined, the shell part is cut off from the position of 2mm, the width of the butt seam allowance is ensured to be 2mm, and the machining precision and the machining efficiency of the butt seam allowance are greatly improved.
Examples
Example 1
The selected test part is a booster shell of a commercial aerospace certain type aircraft, the shell is made of TC4 titanium alloy, the whole product is hemispherical, the two surfaces of the product are large in opening, the wall thickness variation range is 1.3-2.4 mm, the wall thickness near the large end is 2.4mm, the wall thickness at the middle part is 1.3mm, the wall thickness near the small end is 1.8mm, the wall thickness of the connecting section is in uniform transition, and the outer diameter of the large end is equal to that of the connecting section
The outer diameter of the butt seam allowance is
The width of the butt joint seam allowance is 1.9mm, and the opening diameter of the top end of the ball is
The height of the shell is about 240mm, and the specific processing method is as follows:
(1) according to the specific structure and size of the required TC4 titanium alloy thin-wall shell, a blank structure with an added technical flanging and machining allowance is designed, 1.5mm machining allowance is reserved on the inner and outer molded surfaces of the shell of the blank structure, the technical flanging is a flat plate structure with the width of 50mm and the thickness of 8mm, a fillet R23mm is added between the thin-wall shell structure and the technical flanging for transition, and the technological extension of a straight line segment with the length of 10mm is achieved.
(2) And (3) processing the blank by adopting a die assembly hot stamping forming method according to the designed blank structure. The process method for die assembly hot stamping forming comprises the following steps: firstly, preheating and insulating a forming female die and a forming male die which are adopted to 550 ℃, and insulating for 1 h; and (3) performing two-time hot stamping forming, wherein the depth of the first hot stamping is 140mm, then performing heat preservation for 0.5h at 550 ℃, performing second hot stamping until the required size of the blank shell is reached, and performing heat preservation for 10min at 550 ℃.
(3) And a process flanging of the blank is processed by a numerical control processing center and is used as a reference for subsequent clamping and fixing. The technological flanging for processing the blank comprises an upper plane, a lower plane and an outer circular surface of the technological flanging, the thickness removal amount of the upper plane and the lower plane of the technological flanging does not exceed 1/5 of the residual thickness, and two circles of technological flanging are processed on the technological flanging at the same time
The flatness of the upper plane and the lower plane of the process flanging is superior to 0.05.
(4) And clamping a shell blank by adopting a first clamping tool, turning the inner molded surface of the shell, the lower plane of the process flanging, the fillet and the process extension amount to form the intermediate shell by one-step forming. The process method for turning the inner molded surface of the shell comprises the following steps: the outer circular surface of the process flanging is aligned, the lower plane, the fillet, the process extension and the inner molded surface of the shell of the process flanging are synchronously and continuously turned, only the inner circular surface is turned on the lower plane, the processing edge forms an inner edge line, the size of the inner molded surface of the shell can be reflected by measuring the sizes of the lower plane and the process extension of the process flanging, and the size precision of the part can be more accurately ensured.
(5) And clamping the intermediate shell by adopting a second clamping tool, and turning the outer molded surface of the shell. The process method for turning the outer molded surface of the shell comprises the following steps: and (4) aligning the shell by the inner edge line of the lower plane of the process flanging processed in the step (4), and compiling a numerical control turning program of the outer profile of the shell according to the curve profile of the outer profile of the shell so as to accurately process the outer profile of the shell. The reference of the inner profile of the shell is accurately transmitted to the outer profile of the shell through the inner edge line of the lower plane of the technical flanging, and therefore higher spatial position accuracy of the inner profile and the outer profile of the shell is guaranteed. When the outer profile of the shell is turned, cutting parameters need to be strictly controlled, the cutting amount is reduced, the rotating speed of a lathe spindle is set at 40r/min, the radial feed amount is 0.2mm per cutter, meanwhile, when the last three cutters are machined, the wall thickness of the shell is measured point by adopting an ultrasonic wall thickness meter after each cutting, the wall thickness is compared with a theoretical value required by design, and the feed amount of the next cutter is properly adjusted and compensated according to the difference between the wall thickness and the theoretical precision, so that the final wall thickness precision requirement of the shell is ensured to be within +/-0.03 mm.
(6) And clamping the top of the shell by adopting a third clamping tool, turning and machining the butt seam allowance of the shell and cutting off the butt seam allowance to finish the whole finish machining of the TC4 titanium alloy thin-wall shell. The technological method for turning the butt seam allowance of the shell comprises the following steps: when the butt seam allowance is processed, the width of the butt seam allowance is widened, the width of the butt seam allowance is 1.9mm, the butt seam allowance is processed according to 4.9mm, a 3mm widened part with the width larger than 1.9mm falls on the process extension, after the butt seam allowance is processed, the shell part is cut off from the edge of 1.9mm, the width of the butt seam allowance is ensured to be 1.9mm, and meanwhile, the processing precision and the processing efficiency of the butt seam allowance are greatly improved.
The wall thickness of the double-sided large-opening variable-thickness TC4 titanium alloy thin-wall shell processed by the method meets the precision requirements of 2.4 +/-0.03, 1.3 +/-0.03 and 1.8 +/-0.03 mm through inspection, and the size of the butt seam allowance meets the requirements of the butt seam allowance
The butt joint precision requirement of (0, -0.1) mm and 1.9 +/-0.05 mm.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (13)
1. A processing method of a double-sided large-opening variable-thickness titanium alloy thin-wall shell is characterized by comprising the following steps of:
step 1, designing a blank structure with process flanging and machining allowance added according to the specific structure and size of a double-sided large-opening variable-thickness titanium alloy thin-wall shell; the double-sided large-opening thin-wall shell is of a sphere-like structure, an opening structure is processed at the small end of the sphere-like structure, and the large end of the sphere-like structure is an opening formed at the outer edge of the sphere-like structure; the technological flange in the blank structure is of an annular flat plate structure; a fillet transition is added between the thin-wall shell main body structure in the blank structure and the process flanging, and a linear section process extension is added between the outer edge of the thin-wall shell main body structure and the fillet;
step 2, processing the blank by adopting a die assembly stamping forming mode according to the blank structure designed in the step 1;
step 3, processing a technological flanging of the blank by using a numerical control processing center, wherein the technological flanging comprises an upper plane, a lower plane and an outer circular surface of the technological flanging, and is used as a reference for subsequent clamping and fixing, and simultaneously, processing a through hole for clamping and fixing on the technological flanging;
step 4, clamping a shell blank, and turning the inner molded surface of the shell and the lower plane of the process flanging to form an intermediate shell;
step 5, clamping the intermediate shell formed in the step 4, and turning the outer molded surface of the shell;
and 6, clamping the top of the shell, turning and machining the butt seam allowance of the shell and cutting off the butt seam allowance to finish the whole finish machining of the titanium alloy thin-wall shell.
2. The processing method of the double-sided large-opening variable-thickness titanium alloy thin-wall shell as claimed in claim 1, wherein in step 1, the outer diameter of the large-end opening of the double-sided large-opening thin-wall shell is 400-800 mm, the outer diameter of the small-end opening of the double-sided large-opening thin-wall shell is 50-300 mm, and the height of the shell is 200-280 mm;
the wall thickness variation range of the double-sided large-opening thin-walled shell is between 1 mm and 3 mm.
3. The processing method of the double-sided large-opening variable-thickness titanium alloy thin-walled shell as claimed in claim 1, wherein in step 1, a fillet R15-R25 is added between the thin-walled shell main body structure in the blank structure and the process flanging for transition, and a linear section process extension of 8-15mm is added between the outer edge of the thin-walled shell main body structure and the fillet.
4. The processing method of the double-sided large-opening variable-thickness titanium alloy thin-wall shell as claimed in claim 1, wherein in the step 2, the matched die hot stamping forming is implemented by using a forming female die and a forming male die, and the forming female die has a concave surface structure which is consistent with the outer surface of the blank structure and is used for forming the outer surface of the blank structure of the shell; the forming male die is provided with a convex surface structure consistent with the inner profile of the blank structure and used for forming the inner profile of the blank structure.
5. The processing method of the double-sided large-opening variable-thickness titanium alloy thin-wall shell as claimed in claim 1, wherein in the step 2, the process method of die assembly hot stamping forming is as follows: firstly, preheating and insulating a forming female die and a forming male die which are adopted to the temperature of 550 and 700 ℃, and insulating for 0.5-2 h; and then, two times of hot stamping forming are adopted, wherein the depth of the first hot stamping is over half, the temperature is kept for 0.5-1 h at the temperature of 550-700 ℃, the second hot stamping is carried out until the required size of the blank shell is reached, and the temperature is kept for 10-30 min at the temperature of 550-700 ℃.
6. The processing method of the double-sided large-opening variable-thickness titanium alloy thin-wall shell according to claim 1, wherein in the step 3, when the process flanging of the blank is processed, the thickness removal amount of the upper plane and the lower plane of the process flanging does not exceed 1/5 of the residual thickness;
when the outer circular surface of the technological flanging is machined, alignment needs to be carried out according to the inner spherical surface of the blank structure, the outer circular surface of the machined technological flanging is coaxial with the inner spherical surface of the part blank, and the reference of the inner spherical surface of the blank structure is transmitted to the outer circular surface of the technological flanging.
7. The processing method of the double-sided large-opening variable-thickness titanium alloy thin-walled shell according to claim 1, characterized in that in step 4, a first clamping tool is used for clamping the shell blank, the first clamping tool has an annular shell structure for fixing a technological flange of the blank structure, the annular shell structure comprises an annular plane structure and an annular ring located at the edge of the annular plane structure, the annular plane structure is used for being matched with the upper plane of the technological flange, the annular ring is used for being matched with the outer circular surface of the technological flange, and the annular shell structure and the technological flange are fixed through a threaded connecting piece penetrating through the annular shell structure of the first clamping tool and the technological flange.
8. The machining method for the double-sided large-opening variable-thickness titanium alloy thin-wall shell according to claim 1, wherein in the step 4, the process method for turning the inner profile of the shell is as follows: and synchronously and continuously turning the lower plane, the fillet, the process extension and the inner profile of the shell of the process flanging according to the alignment of the outer circular surface of the process flanging, wherein only the ring surface close to the inner side is turned during turning of the lower plane, so that the edge of the lower plane close to the inner ring surface forms an inner edge line, and the accurate reference of the inner profile of the shell is transferred to the inner edge line of the lower plane of the process flanging and the process extension.
9. The method for processing the double-sided large-opening variable-thickness titanium alloy thin-walled shell according to claim 1, wherein in the step 5, a second clamping tool is used for clamping the intermediate shell formed in the step 4, the second clamping tool is provided with a planar shell structure for fixing the technological flange of the blank structure and a male die structure for supporting the inner profile of the shell, the planar shell structure and the male die structure are respectively used for being matched with the lower plane of the technological flange and the inner profile of the shell, and the planar shell structure of the second clamping tool and the threaded connecting piece of the technological flange are arranged in a penetrating mode to fix the planar shell structure and the threaded connecting piece of the technological flange.
10. The machining method for the double-sided large-opening variable-thickness titanium alloy thin-wall shell according to claim 1, wherein in the step 5, the process method for turning the outer profile of the shell is as follows: and (4) aligning the shell through the inner edge line of the lower plane of the process flanging processed in the step (4), and compiling a numerical control turning program of the outer profile of the shell according to the curve profile of the outer profile of the shell to process the outer profile of the shell.
11. The method for processing the double-sided large-opening variable-thickness titanium alloy thin-wall shell according to claim 10, wherein when the outer surface of the shell is turned, the rotating speed of a lathe spindle is set to be not more than 50r/min, the radial feed amount per tool is not more than 0.2mm, and when the last tool is processed, the wall thickness of the shell is measured point by using an ultrasonic wall thickness meter after each cutting, the wall thickness is compared with a theoretical value required by design, and the feed amount of the next tool is adjusted and compensated according to the difference between the wall thickness and the theoretical precision.
12. The method for processing the double-sided large-opening variable-thickness titanium alloy thin-walled shell according to claim 1, wherein in step 6, a third clamping tool is used for clamping the top of the shell, the third clamping tool has a curved surface structure for fixing the outer surface of the small end of the shell and is used for matching with the outer surface of the small end of the shell, and the third clamping tool, the shell and the second clamping tool are fixed together through a threaded connecting piece penetrating through the third clamping tool and the second clamping tool.
13. The method for processing the double-sided large-opening variable-thickness titanium alloy thin-wall shell according to claim 1, wherein in step 6, when the shell butt seam allowance is processed, the processing width of the butt seam allowance is widened, the widened part falls on the process extension, and after the seam allowance processing is finished, the shell part is cut off from the edge of the widened part to obtain the butt seam allowance with the required width.
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| CN114178800A (en) * | 2021-12-31 | 2022-03-15 | 湖北三江航天红阳机电有限公司 | Titanium alloy thin-wall hemisphere processing method |
| CN114700693A (en) * | 2022-04-06 | 2022-07-05 | 北京九天行歌航天科技有限公司 | Method for machining outer surface of bottom of integral central imperforate rocket storage box |
| CN115213688A (en) * | 2022-05-20 | 2022-10-21 | 航天材料及工艺研究所 | Cutting tool and rapid cutting method for large-size special-shaped heat-proof shell |
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| CN115213688A (en) * | 2022-05-20 | 2022-10-21 | 航天材料及工艺研究所 | Cutting tool and rapid cutting method for large-size special-shaped heat-proof shell |
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