CN111069861A - Method for processing U-like thin and long thin-wall cast titanium alloy structural member - Google Patents
Method for processing U-like thin and long thin-wall cast titanium alloy structural member Download PDFInfo
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- CN111069861A CN111069861A CN201911411612.9A CN201911411612A CN111069861A CN 111069861 A CN111069861 A CN 111069861A CN 201911411612 A CN201911411612 A CN 201911411612A CN 111069861 A CN111069861 A CN 111069861A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/16—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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Abstract
The invention belongs to the technical field of casting processing, and discloses a method for processing a U-like thin and long thin-wall cast titanium alloy structural member, which comprises the following steps: when the inner shape is finely processed, the external shape of the titanium alloy structural member is cast by three equal-height tiger clamp type U-shaped thin and long walls; when the shape is finely processed, filling an inner cavity of the U-shaped thin and long thin-wall cast titanium alloy structural member with gypsum, plugging with paraffin, pressing a shape support lug, and processing the outer shape surface of the U-shaped thin and long thin-wall cast titanium alloy structural member; the thermal correction comprises the following steps: clamping the maximum deformation position of the deformation area of the U-shaped thin and long thin-walled casting titanium alloy structural member by using a bow clamp, and adding a titanium base plate on the contact surface of the bow clamp and the part; and horizontally placing the clamped U-shaped thin and long thin-wall casting titanium alloy structural member into a vacuum furnace. The method provided by the invention can solve the technical problems of large clamping deformation and cutting deformation, and large errors of the appearance size and the thin wall size in the processing process of the U-shaped slender thin-wall cast titanium alloy structural member.
Description
Technical Field
The invention relates to the technical field of thin-wall part processing, in particular to a method for processing a U-shaped slender thin-wall casting titanium alloy structural member.
Background
In order to ensure the assembly requirement and control the product weight, the thin-wall titanium alloy casting structural part needs mechanical processing after being cast and formed. The product is slender and thin in wall, and is formed by casting, so that internal stress exists, clamping deformation and cutting deformation are large in the processing process, the errors of the product appearance size and the thin wall size are large, and the yield is low.
Disclosure of Invention
The invention provides a method for processing a U-shaped thin and long thin-wall-like cast titanium alloy structural member, which solves the technical problems of large errors of product appearance size and thin wall size and low percent of pass caused by large clamping deformation and cutting deformation in the processing process of the U-shaped thin and long thin-wall-like cast titanium alloy structural member.
In order to solve the technical problem, the invention provides a method for processing a U-like thin and long thin-wall cast titanium alloy structural member, which comprises the following steps: scribing to coordinate the machining allowance, rough machining inner appearance, vacuum annealing, internal stress elimination, process reinforcing rib removal, finish machining inner appearance and thermal correction;
when the inner shape is finely machined, clamping the U-shaped slender thin wall by three equal-height tigers to cast the outer shape surface of the titanium alloy structural member;
when the shape is finely processed, filling an inner cavity of the U-shaped thin and long thin-wall casting titanium alloy structural member with gypsum, plugging with paraffin, pressing a shape support lug, and processing the outer shape surface of the U-shaped thin and long thin-wall casting titanium alloy structural member;
the thermal sizing comprises:
clamping the maximum deformation position of the deformation area of the U-shaped thin and long thin-walled casting titanium alloy structural member by using a bow clamp, and adding a titanium base plate on the contact surface of the bow clamp and the part;
horizontally placing the clamped U-shaped thin and long thin-wall casting titanium alloy structural part into a vacuum furnace;
the thermal sizing process comprises the following steps: heating, vacuumizing and maintaining;
heating to 450 +/-10 ℃ along with the furnace, preserving heat, and then heating to 720 +/-10 ℃ and preserving heat;
cooling to below 250 deg.C with the furnace, discharging, air cooling to vacuum degree of not less than 1 × 10-2Pa。
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the processing method of the U-shaped thin and long thin-wall cast titanium alloy structural part, internal stress existing after casting is eliminated through vacuum annealing; the problem that the clamping is unreliable because the side wall is thin is solved by improving the clamping method; by adding the vacuum thermal sizing, the processing deformation of the product is reduced, the product precision is improved, and the problems that the part connected with the reinforcing rib is opened outwards and the width size of the part is unqualified are solved.
Drawings
FIG. 1 is a top view of a U-like thin and long thin-walled cast titanium alloy structural member provided by the present invention;
FIG. 2 is a front view of a U-like thin and long thin-walled cast titanium alloy structural member according to the present invention;
FIG. 3 is a left side view of a U-like thin and long thin-walled cast titanium alloy structural member according to the present invention;
FIG. 4 is a right side view of a U-like elongated thin-walled cast titanium alloy structural member provided in accordance with the present invention;
fig. 5 is a view B-B of the U-like elongated thin-walled cast titanium alloy structural member provided by the invention.
Detailed Description
The embodiment of the application provides a method for processing a U-like thin and long thin-wall cast titanium alloy structural member, and solves the technical problems of large errors of product appearance size and thin-wall size and low qualified rate caused by large clamping deformation and cutting deformation in the processing process of the U-like thin and long thin-wall cast titanium alloy structural member.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features of the embodiments and examples of the present application may be combined with each other without conflict.
Referring to fig. 1, 2, 3, 4 and 5, the U-shaped slender thin-wall cast titanium alloy structural member according to the present embodiment belongs to a cast part, and the minimum thickness of the side wall is 1 mm. After the part is cast, machining allowance of about 3m is reserved on each surface of the outer surface, the side wall, the reinforcing ribs and the like. The parts are slender, thin in wall, poor in rigidity and large in processing surface.
Specifically, the shell is formed by titanium alloy casting and then machining, is made of ZTA15 and belongs to a long thin-wall box-shaped structure, and is internally provided with a reinforcing rib and is externally provided with a support lug. The length size of the shell is 1005mm, the maximum height is 103mm, the width is 80mm, the thinnest wall thickness is 1mm, the wall thickness of the side reinforcing ribs is 5mm, the sunken wall thickness is 3.5mm, and the thickness of the reinforcing ribs is 3 mm.
At present, the processing method of the thin-wall parts is mainly carried out in a mode of roughly and finely processing the inner appearance after scribing and vice clamping, and the following steps are carried out:
1) internal stress exists after casting;
2) the side wall is thin, the clamping is unreliable, the clamping deformation exists, and the wall thickness dimension is difficult to ensure;
3) the part without the connection of the reinforcing ribs is opened outwards, and the width dimension of the part is unqualified.
For the above U-shaped casting, the present application provides a method for processing a U-shaped elongated thin-walled cast titanium alloy structural member, including: scribing to coordinate the machining allowance, rough machining inner appearance, vacuum annealing, internal stress elimination, process reinforcing rib removal, finish machining inner appearance and thermal correction;
when the inner shape is finely machined, clamping the U-shaped slender thin wall by three equal-height tigers to cast the outer shape surface of the titanium alloy structural member;
when the shape is finely processed, filling an inner cavity of the U-shaped thin and long thin-wall casting titanium alloy structural member with gypsum, plugging with paraffin, pressing a shape support lug, and processing the outer shape surface of the U-shaped thin and long thin-wall casting titanium alloy structural member;
the thermal sizing comprises:
clamping the maximum deformation position of the deformation area of the U-shaped thin and long thin-walled casting titanium alloy structural member by using a bow clamp, and adding a titanium base plate on the contact surface of the bow clamp and the part;
horizontally placing the clamped U-shaped thin and long thin-wall casting titanium alloy structural part into a vacuum furnace;
the thermal sizing process comprises the following steps: heating, vacuumizing and maintaining;
heating to 450 +/-10 ℃ along with the furnace, preserving heat, and then heating to 720 +/-10 ℃ and preserving heat;
cooling to below 250 deg.C with the furnace, discharging, air cooling to vacuum degree of not less than 1 × 10-2Pa。
Specifically, heating, vacuumizing, and vacuum-pumping to 3.5X 10-3Heating to 450 + -10 deg.C with Pa, maintaining for 30+50min, heating to 720 + -10 deg.C with furnace, maintaining for 55-65 min, cooling to below 250 deg.C with furnace, and maintaining the vacuum state until the temperature is reduced to 250 deg.C, wherein the vacuum degree is not lower than 1 × 10-2Pa。
Taking out the part, and checking the width of the corrected part to be
If the requirement is not met, adjusting the clamping amount, and repeating the steps until the clamping amount is qualified
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the processing method of the U-shaped thin and long thin-wall cast titanium alloy structural part, internal stress existing after casting is eliminated through vacuum annealing; the problem that the clamping is unreliable because the side wall is thin is solved by improving the clamping method; by adding the vacuum thermal sizing, the processing deformation of the product is reduced, the product precision is improved, and the problems that the part connected with the reinforcing rib is opened outwards and the width size of the part is unqualified are solved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (1)
1. A method for processing a U-like thin and long thin-wall cast titanium alloy structural member is characterized by comprising the following steps: scribing to coordinate the machining allowance, rough machining inner appearance, vacuum annealing, internal stress elimination, process reinforcing rib removal, finish machining inner appearance and thermal correction;
when the inner shape is finely machined, clamping the U-shaped slender thin wall by three equal-height tigers to cast the outer shape surface of the titanium alloy structural member;
when the shape is finely processed, filling an inner cavity of the U-shaped thin and long thin-wall casting titanium alloy structural member with gypsum, plugging with paraffin, pressing a shape support lug, and processing the outer shape surface of the U-shaped thin and long thin-wall casting titanium alloy structural member;
the thermal sizing comprises:
clamping the maximum deformation position of the deformation area of the U-shaped thin and long thin-walled casting titanium alloy structural member by using a bow clamp, and adding a titanium base plate on the contact surface of the bow clamp and the part;
horizontally placing the clamped U-shaped thin and long thin-wall casting titanium alloy structural part into a vacuum furnace;
the thermal sizing process comprises the following steps: heating, vacuumizing and maintaining;
heating to 450 +/-10 ℃ along with the furnace, preserving heat, and then heating to 720 +/-10 ℃ and preserving heat;
cooling to below 250 deg.C with the furnace, discharging, air cooling to vacuum degree of not less than 1 × 10-2Pa。
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