CN103753124A - Machining method for large cast titanium alloy diamond-shaped cabin shell - Google Patents
Machining method for large cast titanium alloy diamond-shaped cabin shell Download PDFInfo
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- CN103753124A CN103753124A CN201310704350.1A CN201310704350A CN103753124A CN 103753124 A CN103753124 A CN 103753124A CN 201310704350 A CN201310704350 A CN 201310704350A CN 103753124 A CN103753124 A CN 103753124A
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Abstract
The invention discloses a machining method for a large cast titanium alloy diamond-shaped cabin shell and belongs to the machining method for a complex piece. The machining method for the large cast titanium alloy diamond-shaped cabin shell includes the following steps: step 1, machining a base and measuring; step 2, carrying out three-dimensional scanning on a blank and detecting; step 3, carrying out self-adaption machining on a rough base; step 4, roughly machining the shape; step 5, detecting the size and performing three-dimensional scanning; step 6, performing heat treatment; step 7, performing three-dimensional scanning and detecting; step 8, finishing the base; step 9, finishing the shape; step 10, detecting the shell. The machining method for the large cast titanium alloy diamond-shaped cabin shell is capable of comprehensively analyzing the cast size precision and allowance, quickly determining the machining base, controlling the wall thickness uniformity and guaranteeing the shell quality, has small machining deformation, and enables the manufacturing cycle to be shortened.
Description
Technical field
The present invention relates to complex structural member machining process, particularly a kind of massive casting titanium alloy rhombus cabin piece housing processing method.
Background technology
The sixties in 20th century countries in the world application Titanium Alloy Precision Casting Technology that begins one's study, research and application through decades, proof titanium alloy casting is safe and reliable as Aeronautics and Astronautics member, its Performance And Reliability can compare favourably with plastic deformable member, what have approaches forging, and manufacturing cost, production cycle are obviously better than plastic deformable member.And single-casting eliminated mechanical link, reduced component count, alleviated the weight of structural member, improved the globality of structure.
Along with the update of China's Aerospace Products, to improving constantly of the requirements such as structural parts whole, wall thickness, dimensional accuracy, material property, the demand of large-scale integral titanium alloy precision casting is increasing.For adapting to the needs of product development, mainly adopt after titanium alloy model casting or graphite casting, the machinings such as fitting surface, joint face are formed.
Titanium alloy thin wall network rhombus cabin piece housing has following characteristics:
(1) a little less than thin, the rigidity of large, the network of housing appearance and size, wall;
(2) cabin piece housing size rapport is many;
(3) there is distortion and shrink in shell cast, and casting rear profile degree, evenness of wall thickness, allowance etc. have larger difference with theory state;
(4) there is defect in casting, adopted repair welding processing;
(5) there is casting stress, welding stress, clamping stress and cutting stress in product;
(6) allowance is inhomogeneous.
Thin-walled grid means that housing is hollow cellular structure drop, and wall thickness is less than 12mm, is greater than Φ 1200mm, is highly greater than 1000mm and is considered to large-scale housing at housing rhombus limit, this area circumscribed circle diameter.
The procedure of processing of existing cast titanium alloy thin-walled network rhombus cabin piece housing is as follows:
(1) each face surplus of foundry goods is coordinated in line;
(2) roughing end face;
(3) roughing profile;
(4) detection is is respectively faced the wall and meditated thick;
(5) end face and profile surplus are coordinated in line;
(6) finish facing and butt hole;
(7) fine finishining profile.
Existing processing method cannot complete detection casting dimension, causes the casting quality, foundry goods surplus can not Efficient Evaluation; The benchmark that can not realize exactly under full-scale constraint is coordinated, and causes product machining benchmark to be difficult to determine; Evenness of wall thickness is difficult to control, and a little less than product rigidity, processes yielding.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of can multianalysis casting dimensional accuracy and surplus, determine machining benchmark fast, control evenness of wall thickness, machining deformation is little, can guarantee housing quality, reduce the massive casting titanium alloy rhombus cabin piece housing processing method of manufacturing cycle.
For solving the problems of the technologies described above, the invention provides a kind of massive casting titanium alloy rhombus cabin piece housing processing method, comprise the following steps: step 1, in-process measurement benchmark, levelling housing rear end face, light is shown in processing, then four limits, centering back-end box rhombus outside, determine center, roughing rhombus four limits; Step 2, to casing blank 3-D scanning and the detection after processing, determines detection coordinates system according to the end face of having processed and rhombus four limits, and the inside and outside shape of housing is scanned; The shape in housing of take is benchmark, and shell casting model and housing scan model are carried out to best fit; Step 3, the thick benchmark of adaptive machining, by housing rear end face upward, centering detection coordinates system, carries out coordinate system biasing with the rapport that best fit is definite, then housing end face is processed, and determines roughing benchmark; Step 4, according to roughing benchmark roughing housing profile; Step 5, size detection and 3-D scanning, adopt conventional method to detect roughing back casing size, adopts 3 D detection method, detects form and position tolerance; Step 6, heat-treats the housing after detecting; Step 7,3-D scanning and detection, detect the housing appearance profile degree form and position tolerance after heat treatment, and contrasts profile in scanning housing, each face surplus of shape in analyzing before heat treatment; Step 8, fine finishining benchmark, coordinates fine finishining benchmark according to the uniformity of shape surplus in housing; Step 9, according to fine finishining benchmark fine finishining housing profile; Step 10, detects fine finishining back casing, adopts conventional method to detect linear dimension, adopts 3 D detection method to detect form and position tolerance.
Further, step 2 comprises: step 2-1, with housing, processed end face and rhombus four limits determine that detection coordinates is O1xyz, profile in scanning housing; Step 2-2, the shape in housing of take are benchmark, and cast model and scan model are carried out to best fit, analyze profile profile tolerance and end face flatness in foundry goods; The ullage of step 2-3, detection casing blank, allowance distribution situation; Step 2-4, after best fit, determine the position relationship of rear end face, rhombus center, rear end and detection coordinates system.
Further, step 3 comprises: step 3-1, by housing rear end face upward, and centering rear end face and the rhombus limit having processed, determine that detection coordinates is O1xyz; Step 3-2, with the definite rapport of best fit, carry out coordinate system biasing, determine that actual machining coordinate is O2xyz; Step 3-3, milling processing rear end face, made allowance 2mm, and unison is to the muscle centre-to-centre spacing distance of end face before and after; Rhombus limit in step 3-4, milling processing rear end, one side made allowance 2mm; Step 3-5, processing rear end face dowel hole, made allowance 2mm.
Further, step 4 comprises: step 4-1, with rear end face and dowel hole location, milling processing housing front end face, made allowance 2mm; Step 4-2, milling housing profile, monolateral made allowance is not less than 1.5mm.
Further, step 5 comprises: step 5-1, employing conventional method detect the size of roughing back casing; Step 5-2, employing 3 D detection method, take rear end face and dowel hole as form and position tolerances such as the inside and outside shape profile tolerances of benchmaring housing.
Further, step 7 comprises: step 7-1, rear end face and the pin-and-hole of the housing after heat treatment of take are benchmaring appearance profile degree and form and position tolerance, before heat-treating, contrast with housing; Profile in step 7-2, scanning housing, take rear end face and pin-and-hole as benchmark is by scan model and product model matching, analyzes each face surplus of shape in housing.
Further, step 8 comprises: step 8-1, according to the uniformity of shape surplus in the judgement of each face surplus of shape in housing, and processing rear end face, removes surplus, is worked into design size; Step 8-2, processing rear end face dowel hole and connecting hole, to design size.
Further, step 8 comprises: step 8-3, according to the uniformity of shape surplus in the judgement of each face surplus of shape in housing, 3-D scanning model and product model be take to interior shape as benchmark again matching, and determine the amount of bias of coordinate system after matching; Step 8-4, procedure is carried out to coordinate system biasing, processing rear end face, removes surplus, is worked into design size; In step 8-5, processing rear end, rhombus limit is to design size; Step 86, processing rear end face dowel hole and connecting hole, to design size.
Further, step 9 comprises: step 9-1, to take rear end face and dowel hole be fine finishining origin reference location, and processing front end face and end-face hole, to design size; Step 9-2, fine finishining housing profile and sagging, to design size.
Further, step 10 comprises: step 10-1, employing conventional method detect the linear dimension of fine finishining back casing; Step 10-2, to take end face and pin-and-hole be benchmark, adopts 3 D detection method to detect the form and position tolerances such as the inside and outside shape profile tolerance of fine finishining back casing.
A kind of massive casting titanium alloy rhombus provided by the invention cabin piece housing processing method is shown in light by levelling housing rear end face processing, Si Bian center outside centering back-end box rhombus then, and roughing rhombus four limits, determine detection reference, with housing, processed end face and rhombus four limits and determined detection coordinates system, to casing blank 3-D scanning and the detection after processing, the shape in housing of then take is benchmark, and shell casting model and housing scan model are carried out to best fit, by housing rear end face upward, centering detection coordinates system, carries out coordinate system biasing with the rapport that best fit is definite, and the thick benchmark of adaptive machining housing, then according to thick benchmark roughing housing profile, housing is carried out to size detection and 3-D scanning, adopt conventional method to detect roughing back casing size, adopt 3 D detection method to detect form and position tolerance, housing after detecting is heat-treated, housing after heat treatment is carried out to 3-D scanning and detection, detect the housing appearance profile degree form and position tolerance after heat treatment, with before heat treatment, contrast, profile in scanning housing, each face surplus of shape in analyzing, according to the uniformity of shape surplus in housing, coordinate fine finishining benchmark, according to fine finishining benchmark fine finishining housing profile, after machining, fine finishining back casing is detected, adopt conventional method to detect linear dimension, adopt 3 D detection method to detect form and position tolerance, can multianalysis cast dimensional accuracy and surplus like this, determine fast machining benchmark, control evenness of wall thickness, machining deformation is little, can guarantee housing quality, reduce the manufacturing cycle.
Accompanying drawing explanation
The massive casting titanium alloy rhombus cabin piece housing processing method that Fig. 1 provides for the embodiment of the present invention.
The cast titanium alloy thin-walled network cabin piece housing structural representation that Fig. 2 provides for the embodiment of the present invention.
The specific embodiment
Referring to Fig. 1, a kind of massive casting titanium alloy rhombus cabin piece housing processing method that the embodiment of the present invention provides, comprise the following steps: step 1, in-process measurement benchmark, light is shown in the processing of levelling housing rear end face, meeting light reaches 80%, then four limits, centering back-end box rhombus outside, determine center, roughing rhombus four limits, respectively meet personally light 80%.Step 2, to casing blank 3-D scanning and the detection after processing, determines detection coordinates system according to processing end face and rhombus four limits, and the shape in housing of take is benchmark, and shell casting model and housing scan model are carried out to best fit.Wherein 3-D scanning detects casting quality, detects the inside and outside shape surplus of shell casting.Step 3, the thick benchmark of adaptive machining, by housing rear end face upward, centering detection coordinates system, carries out coordinate system biasing with the rapport that best fit is definite, then housing end face is processed, and determines roughing benchmark.Adaptive machining is to coordinate machining benchmark by best fit, determines machining coordinate system.Step 4, according to roughing benchmark roughing housing profile; Step 5, size detection and 3-D scanning, adopt conventional method to detect roughing back casing linear dimension, adopts 3 D detection method to detect profile tolerance and form and position tolerance.Step 6, heat-treats the housing after detecting.Step 7,3-D scanning and detection, detect housing appearance profile degree and form and position tolerance after heat treatment, and contrasts profile in scanning housing, each face surplus of shape in analyzing before heat treatment.Step 8, fine finishining benchmark, coordinates the smart benchmark of processing according to the uniformity of shape surplus in housing.Step 9, according to fine finishining benchmark fine finishining housing profile.Step 10, detects fine finishining back casing, adopts conventional method to detect linear dimension, adopts 3 D detection method to detect profile tolerance and form and position tolerance.
Step 2 comprises: step 2-1, with the end face and rhombus four limits that have processed, determine that detection coordinates is O1xyz, profile in scanning housing; Step 2-2, the shape in housing of take are benchmark, and cast model and scan model are carried out to best fit, analyze profile profile tolerance and end face flatness in foundry goods; The ullage of step 2-3, detection casing blank, allowance distribution situation; Step 2-4, after best fit, determine the position relationship of rear end face, rhombus center, rear end and detection coordinates system.
Step 3 comprises: step 3-1, by housing rear end face upward, and centering rear end face and the rhombus limit having processed, determine that detection coordinates is O1xyz; Step 3-2, with the definite rapport of the best fit of 3-D scanning, carry out coordinate system biasing, determine that actual machining coordinate is O2xyz; Step 3-3, milling processing rear end face, made allowance 2mm, and unison is to the muscle centre-to-centre spacing distance of end face before and after; Rhombus limit in step 3-4, milling processing rear end, one side made allowance 2mm; Step 3-5, processing rear end face dowel hole, made allowance 2mm.
Step 4 comprises: step 4-1, with rear end face and dowel hole location, milling processing housing front end face, made allowance 2mm; Step 4-2, milling housing profile, monolateral made allowance is not less than 1.5mm.
Step 5 comprises: step 5-1, employing conventional method detect the size of roughing back casing; Step 5-2, employing 3 D detection method, take rear end face and dowel hole as form and position tolerances such as the inside and outside shape profile tolerances of benchmaring housing.
Step 7 comprises: step 7-1, take the rear end face of the housing after heat treatment and pin-and-hole as form and position tolerances such as benchmaring appearance profile degree, before heat-treating, contrast with housing; Profile in step 7-2, scanning housing, take rear end face and pin-and-hole as benchmark is by scan model and product model matching, analyzes each face surplus of shape in housing.
Step 8 comprises: step 8-1, according to the uniformity of shape surplus in the judgement of each face surplus of shape in housing, if evenly, process rear end face, remove surplus, and be worked into design size; Step 8-2, processing rear end face dowel hole and connecting hole, to design size.
Step 8 comprises: step 8-3, according to the uniformity of shape surplus in the judgement of each face surplus of shape in housing, if inhomogeneous, 3-D scanning model and product model be take to interior shape as benchmark again matching, and determine the amount of bias of coordinate system after matching; Step 8-4, procedure is carried out to coordinate system biasing, processing rear end face, removes surplus, is worked into design size; In step 8-5, processing rear end, rhombus limit is to design size; Step 8-6, processing rear end face dowel hole and connecting hole, to design size.
Step 9 comprises: step 9-1, to take rear end face and dowel hole be fine finishining origin reference location, and processing front end face and end-face hole, to design size; In step 9-2, processing front end, rhombus limit is to design size; Step 9-3, processing front end face pin-and-hole and connecting hole, to design size; Step 9-4, fine finishining external surface and profile are sunk.
Step 10 comprises: step 10-1, employing conventional method detect the linear dimension of fine finishining back casing; Step 10-2, to take end face and pin-and-hole be benchmark, adopts that 3-D scanning method detects in fine finishining back casing, shape profile tolerance; Step 10-3, to take rear end face and pin-and-hole be benchmark, adopts other form and position tolerance of three-dimensional coordinates measurement.
When using massive casting titanium alloy rhombus of the present invention cabin piece housing processing method.
One embodiment of the present of invention, as shown in Figure 2, cast titanium alloy thin-walled network cabin piece housing 1 is thin-walled network structure, blank is formed by graphite mold casting.
Step 2, the 3-D scanning of casing blank and detecting step:
Step 2-1, with the end face and rhombus four limits that have processed, determine that detection coordinates is O1xyz, profile in scanning housing;
Step 2-2, the shape in housing of take are benchmark, and cast model and scan model are carried out to best fit, analyze profile profile tolerance, end face flatness etc. in foundry goods;
Step 2-3, whether exposed, allowance distribution situation if detecting blank;
Step 2-4, after best fit, determine the position relationship of rear end face, rhombus center, rear end and former detection coordinates system.
Step 3, the thick benchmark step of adaptive machining:
Step 3-1, housing front end face location, centering rear end face and the rhombus limit having processed, determine coordinate system O1xyz;
Step 3-2, with the definite rapport of best fit, carry out coordinate system biasing, determine that actual machining coordinate is O2xyz;
Step 3-3, milling processing rear end face, made allowance 2mm, and unison is to the distance of muscle centre-to-centre spacing front and rear end, guarantees that the rear axial dimension of processing respectively has 2mm surplus;
Rhombus limit in step 3-4, milling processing rear end, one side made allowance 2mm;
Step 3-5, processing rear end face dowel hole, made allowance 2mm.
Step 4, roughing profile step:
The thick benchmark of processing that step 4-1, basis record, upper frock, with rear end face and pin-and-hole location, milling processing housing front end face, made allowance 2mm;
Step 4-2, milling housing profile, monolateral made allowance 2mm.
Step 5, size detection and 3-D scanning step:
Step 5-1, employing conventional method detect each linear dimension;
Step 5-2, employing 3 D detection method, take rear end face and pin-and-hole as form and position tolerances such as the inside and outside shape profile tolerances of benchmaring housing.
Step 6, heat treatment step: adopt vacuum annealing, eliminate stress, deformation of products is controlled in 1mm.
Step 7,3-D scanning and detecting step:
Step 7-1, to take rear end face and pin-and-hole be the form and position tolerances such as benchmaring appearance profile degree, and contrasts before heat treatment;
Profile in step 7-2, scanning housing, take rear end face and pin-and-hole as benchmark matching, each face surplus of shape in analyzing.
Step 8, fine finishining benchmark step:
According to the uniformity of shape surplus in each face surplus judgement of the interior shape of housing 1,
When interior shape surplus is even, adopt:
Step 8-1, according to the uniformity of shape surplus in the judgement of each face surplus of shape in housing, if evenly, process rear end face, remove surplus, be worked into design size;
Step 8-2, processing rear end face dowel hole and connecting hole, to design size;
When interior shape surplus is inhomogeneous, adopt:
Step 8-3, the model of 3-D scanning and product model be take to interior shape as benchmark again matching, determine the amount of bias of coordinate system after matching;
Step 8-4, with front end face location, coordinate system is determined at centering rear end face and center, uses the result after matching to carry out coordinate system biasing, processing rear end face is to design size;
In step 8-5, processing rear end, rhombus limit is to design size;
Step 8-6, processing rear end face pin-and-hole and connecting hole, to design size.
Step 9, fine finishining profile step:
Step 9-1, according to frock on fine finishining benchmark, with rear end face and pin-and-hole location, processing front end face, guarantees that height dimension is to design size;
In step 9-2, processing front end, rhombus limit is to design size;
Step 9-3, processing front end face pin-and-hole and connecting hole, to design size;
Step 9-4, fine finishining external surface and profile are sunk.
Step 10, detecting step:
Step 101, employing conventional method detect linear dimension;
Step 10-2, to take rear end face and pin-and-hole be benchmark, adopts profile profile tolerance in 3-D scanning testing product;
Step 10-3, to take rear end face and pin-and-hole be benchmark, adopts other form and position tolerance of three-dimensional coordinates measurement.
A kind of massive casting titanium alloy rhombus provided by the invention cabin piece housing processing method is shown in light by levelling housing rear end face processing, Si Bian center outside centering back-end box rhombus then, and roughing rhombus four limits, determine detection reference, with housing, processed end face and rhombus four limits and determined detection coordinates system, to casing blank 3-D scanning and the detection after processing, the shape in housing of then take is benchmark, and shell casting model and housing scan model are carried out to best fit, by housing rear end face upward, centering detection coordinates system, carries out coordinate system biasing with the rapport that best fit is definite, and the thick benchmark of adaptive machining housing, then according to thick benchmark roughing housing profile, housing is carried out to size detection and 3-D scanning, adopt conventional method to detect roughing back casing size, adopt 3 D detection method to detect form and position tolerance, housing after detecting is heat-treated, housing after heat treatment is carried out to 3-D scanning and detection, detect the housing appearance profile degree form and position tolerance after heat treatment, with before heat treatment, contrast, profile in scanning housing, each face surplus of shape in analyzing, according to the uniformity of shape surplus in housing, coordinate fine finishining benchmark, according to fine finishining benchmark fine finishining housing profile, after machining, fine finishining back casing is detected, adopt conventional method to detect linear dimension, adopt 3 D detection method to detect form and position tolerance, can multianalysis cast dimensional accuracy and surplus like this, determine fast machining benchmark, control evenness of wall thickness, machining deformation is little, can guarantee housing quality, reduce the manufacturing cycle.
It should be noted last that, the above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. a massive casting titanium alloy rhombus cabin piece housing processing method, is characterized in that, comprises the following steps: step 1, in-process measurement benchmark, levelling housing rear end face, light is shown in processing, then four limits, centering back-end box rhombus outside, determine center, roughing rhombus four limits; Step 2, to casing blank 3-D scanning and the detection after processing, determines detection coordinates system according to the end face of having processed and rhombus four limits, and the inside and outside shape of housing is scanned; The shape in housing of take is benchmark, and shell casting model and housing scan model are carried out to best fit; Step 3, the thick benchmark of adaptive machining, by housing rear end face upward, centering detection coordinates system, carries out coordinate system biasing with the rapport that best fit is definite, then housing end face is processed, and determines roughing benchmark; Step 4, according to roughing benchmark roughing housing profile; Step 5, size detection and 3-D scanning, adopt conventional method to detect roughing back casing size, adopts 3 D detection method, detects form and position tolerance; Step 6, heat-treats the housing after detecting; Step 7,3-D scanning and detection, detect the housing appearance profile degree form and position tolerance after heat treatment, and contrasts profile in scanning housing, each face surplus of shape in analyzing before heat treatment; Step 8, fine finishining benchmark, coordinates fine finishining benchmark according to the uniformity of shape surplus in housing; Step 9, according to fine finishining benchmark fine finishining housing profile; Step 10, detects fine finishining back casing, adopts conventional method to detect linear dimension, adopts 3 D detection method to detect form and position tolerance.
2. processing method according to claim 1, is characterized in that: step 2 comprises: step 2-1, to process end face and rhombus four limits, determine that detection coordinates is O1xyz, profile in scanning housing; Step 2-2, the shape in housing of take are benchmark, and cast model and scan model are carried out to best fit, analyze profile profile tolerance and end face flatness in foundry goods; The ullage of step 2-3, detection casing blank, allowance distribution situation; Step 2-4, after best fit, determine the position relationship of rear end face, rhombus center, rear end and detection coordinates system.
3. processing method according to claim 2, is characterized in that: step 3 comprises: step 3-1, by housing rear end face upward, and centering rear end face and the rhombus limit having processed, determine that detection coordinates is O1xyz; Step 3-2, with the definite rapport of best fit, carry out coordinate system biasing, determine that actual machining coordinate is O2xyz; Step 3-3, milling processing rear end face, made allowance 2mm, and unison is to the muscle centre-to-centre spacing distance of end face before and after; Rhombus limit in step 3-4, milling processing rear end, one side made allowance 2mm; Step 3-5, processing rear end face dowel hole, made allowance 2mm.
4. processing method according to claim 3, is characterized in that: step 4 comprises: step 4-1, with rear end face and dowel hole location, milling processing housing front end face, made allowance 2mm; Step 4-2, milling housing profile, monolateral made allowance is not less than 1.5mm.
5. processing method according to claim 4, is characterized in that: step 5 comprises: step 5-1, employing conventional method detect the size of roughing back casing; Step 5-2, employing 3 D detection method, take rear end face and dowel hole as form and position tolerances such as the inside and outside shape profile tolerances of benchmaring housing.
6. processing method according to claim 5, is characterized in that: step 7 comprises: step 7-1, rear end face and the pin-and-hole of the housing after heat treatment of take are benchmaring appearance profile degree and form and position tolerance, before heat-treating, contrast with housing; Profile in step 7-2, scanning housing, take rear end face and pin-and-hole as benchmark is by scan model and product model matching, analyzes each face surplus of shape in housing.
7. according to the processing method described in claim 6, it is characterized in that: step 8 comprises: step 8-1, according to the uniformity of shape surplus in the judgement of each face surplus of shape in housing, processing rear end face, removes surplus, is worked into design size; Step 8-2, processing rear end face dowel hole and connecting hole, to design size.
8. processing method according to claim 6, it is characterized in that: step 8 comprises: step 8-3, according to the uniformity of shape surplus in the judgement of each face surplus of shape in housing, 3-D scanning model and product model be take to interior shape as benchmark again matching, determine the amount of bias of coordinate system after matching; Step 8-4, procedure is carried out to coordinate system biasing, processing rear end face, removes surplus, is worked into design size; In step 8-5, processing rear end, rhombus limit is to design size; Step 8-6, processing rear end face dowel hole and connecting hole, to design size.
9. according to the processing method described in claim 7 or 8, it is characterized in that: step 9 comprises: step 9-1, to take rear end face and dowel hole be fine finishining origin reference location, processing front end face and end-face hole, to design size; In step 9-2, processing front end, rhombus limit is to design size; Step 9-3, processing front end face pin-and-hole and connecting hole, to design size; Step 9-4, fine finishining external surface and profile are sunk.
10. processing method according to claim 9, is characterized in that: step 10 comprises: step 10-1, employing conventional method detect the linear dimension of fine finishining back casing; Step 10-2, to take end face and pin-and-hole be benchmark, adopts 3-D scanning detection method to detect the inside and outside shape profile tolerance of fine finishining back casing; Step 10-3, to take rear end face and pin-and-hole be benchmark, adopts other form and position tolerance of three-dimensional coordinates measurement.
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