Machining method of titanium alloy shell

Abstract

The invention discloses a machining method of a titanium alloy shell, and belongs to the technical field of titanium alloy machining. The machining method comprises the following steps that S1, material picking is conducted, specifically, raw materials for machining the titanium alloy shell are picked according to marks; s2, heat treatment: carrying out heat preservation on the raw materials at 750 + / -10 DEG C for 1-2 hours, and carrying out furnace cooling; s3, multiple turning 1: flattening an end face, turning an outer circle and an inner hole, and keeping the allowance of 1mm on a single face; after completion, clamping and aligning the reverse side, leveling the total length, turning an inner hole, and keeping the margin of 1mm on a single side; s4, annealing: keeping the temperature of the material after turning at 600 + / -20 DEG C for 1-2 hours, and cooling along with the furnace; s5, second turning is conducted, specifically, clamping and alignment are conducted, the end face is flattened, the outer circle is turned till all the faces are shiny, and the jump is smaller than 0.03; finely turning an inner hole and an end surface; s6, numerical turning 3: turning an outer circle; s7, numerical milling: milling a threaded hole and a notch; s8, deburring is conducted; s9, performing inspection; and S10, the titanium alloy shell finished product is kept at the temperature ranging from-60 DEG C to-120 DEG C for 1-2 hours. According to the scheme, the problem that internal stress is prone to occurring in the existing titanium alloy shell machining process is solved.

Description

Technical Field

[0001] The invention relates to the technical field of titanium alloy processing, and in particular to a processing method for a titanium alloy shell. Background Art

[0002] Titanium alloy housing is a high-performance structural component, widely used in aerospace, medical, automotive, chemical and other fields. Titanium alloy has many unique performance advantages, such as high strength, light weight, high temperature resistance and corrosion resistance. And its thermal expansion coefficient is low, so it has the advantage of maintaining the accuracy of structural stability.

[0003] A titanium alloy shell is required in a certain military product. However, during the current processing of the titanium alloy shell, internal stress is prone to occur, resulting in unstable material properties, which in turn affects the quality and reliability of the product. Summary of the invention

[0004] The present invention aims to provide a method for processing a titanium alloy shell, so as to solve the problem of internal stress that is easily generated during the current processing of the titanium alloy shell.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for processing a titanium alloy shell, comprising the following steps:

[0006] S1, pick up materials: pick up the raw materials for processing the titanium alloy shell according to the label;

[0007] S2, heat treatment: put the raw materials into the heat treatment furnace, start the heat treatment furnace, gradually increase the temperature, the heating rate is 100-150℃ / hour, when the furnace temperature reaches 750℃, the furnace temperature is stabilized at 750℃±10℃, keep warm for 1-2 hours, and cool with the furnace;

[0008] S3, number turning 1: clamp and align the heat-treated material, flatten the end face, turn the outer circle and inner hole, and make a 1mm allowance on one side; after completion, clamp and align the reverse side, flatten the total length and turn the inner hole, and make a 1mm allowance on one side;

[0009] S4, annealing: put the material after several turning into a heat treatment furnace, preheat and heat it up at a rate of 100-150℃ / hour. After heating to 600℃, stabilize the furnace temperature at 600℃±20℃, keep it at that temperature for 1-2 hours, and cool it with the furnace;

[0010] S5, Counting and turning 2: Clamping and alignment, flat end face, turning the outer circle until all surfaces are polished, run-out < 0.03; precision turning the inner hole and end face;

[0011] S6, turning 3: After turning 2, the material is clamped and aligned on the tooling, and the outer circle is turned;

[0012] S7, CNC milling: Clamp and align according to the D view of the drawing, mill threaded holes 8-M2.5 evenly distributed, and ensure that the center of the circle is On the circle; milling threaded holes M2, thread depth 5 evenly distributed; milling notches to ensure size 4. 16-R2, 16-R1, depth 7.5, sharp edge chamfer 0.3×45°; turn around and clamp, mill 8-M4 threaded holes evenly, ensure that the center of the circle is On the circle, the effective depth of the thread is 6, and the sharp edge chamfer is 0.3×45°; use the EE view to clamp and align, mill four wiring grooves, and the edge of the hole should be carefully rounded to no less than R0.5, ensuring the size: 19.5, 7, 9, 2-R4.5;

[0013] S8, deburring: the burrs that cannot be removed after milling are removed by benchwork to obtain the finished titanium alloy shell;

[0014] S9, Inspection: Check the finished product according to the drawings;

[0015] S10, low temperature heat treatment: put the finished titanium alloy shell into a low temperature treatment furnace, cool it down to -60~-120℃ at a rate of 10~20℃ / hour, keep it for 1~2 hours, and gradually increase the temperature after the insulation is finished, so that the titanium alloy shell slowly returns to room temperature, and put it into storage after full inspection.

[0016] Furthermore, when heat treatment is performed in S2, the heating rate is 130° C. / hour.

[0017] Furthermore, in the annealing in S4, the heating rate is 130° C. / hour.

[0018] Further, in step S5, when performing the number turning 2, clamping and alignment, flat end surface, turning the outer circle until all surfaces are visible, and the run-out is less than 0.03; fine turning the inner hole and end surface; the dimensions must be guaranteed: 1.5 = (144-132.5-10), 7.5, 91.5=(96.5-5), 2-R1, 32=(132.5-96.5+5-9), 6, 60°, 9, sharp edge chamfer 0.3×45°.

[0019] Further, in step S6, when the outer circle is turned by the number 3, the size is guaranteed: 1.5 = (144-132.5-10), 5.5 = (10-4-1.5), To ensure that there is a clearance of 0.004-0.008mm between the shaft and the inner ring of the bearing. The size is long. If it is difficult to ensure the shape and position tolerance requirements, the middle section can be turned lower by less than 0.01mm to ensure that the size and shape and position tolerance of the bearing installation position meet the requirements of the drawing. 84.5 = (96.5-12.5-2), turn the back groove Ensure width 2, root rounding 2-R0.5; external thread M35×1 -0.03 -0.06 The tolerance refers to the tolerance of the outer diameter of M35, which is matched with the inner locking nut and the connecting plate, and the tightness should be appropriate; Guaranteed length 36 = (144-96.5-10-1.5); guaranteed total length 144 0 -0.2 , sharp edge chamfer 0.3×45°.

[0020] Beneficial effects of the present invention:

[0021] 1. The titanium alloy shell processed by this method can ensure that each processed size and shape are consistent, meet the requirements of the drawings, and ensure the accuracy of the titanium alloy shell.

[0022] 2. Through this processing method, through heat treatment and annealing treatment, the mechanical properties of titanium alloy are improved, its strength, toughness and fatigue resistance are improved, and the internal stress of the titanium alloy shell is also reduced. DETAILED DESCRIPTION

[0023] The following is further described in detail through specific implementation methods:

[0024] Example 1

[0025] S1, pick up materials: pick up the raw materials for processing the titanium alloy shell according to the label;

[0026] S2, heat treatment: put the raw materials into the heat treatment furnace, start the heat treatment furnace, gradually increase the temperature, the heating rate is 100℃ / hour, when the furnace temperature reaches 750℃, the furnace temperature is stabilized at 750℃±10℃, keep warm for 2 hours, and cool with the furnace;

[0027] S3, number turning 1: clamp and align the heat-treated material, flatten the end face, turn the outer circle and inner hole, and make a 1mm allowance on one side; after completion, clamp and align the reverse side, flatten the total length and turn the inner hole, and make a 1mm allowance on one side;

[0028] S4, annealing: put the materials after several turns into the heat treatment furnace, preheat and heat up at a rate of 100℃ / hour. After heating to 600℃, stabilize the furnace temperature at 600℃±20℃, keep it at this temperature for 2 hours, and cool it with the furnace;

[0029] S5, Counting and turning 2: Clamping and alignment, flat end face, turning the outer circle until all surfaces are visible, run-out < 0.03; precision turning the inner hole and end face; dimensions to be guaranteed: 7.5, 91.5=(96.5-5), 2-R1, 32=(132.5-96.5+5-9), 6, 60°, 9, sharp edge chamfer 0.3×45°.

[0030] S6, lathe 3: align the material after lathe 2, clamp it in the tooling, and lathe the outer circle; ensure the size: 1.5 = (144-132.5-10), 5.5 = (10-4-1.5), To ensure that there is a clearance of 0.004-0.008mm between the shaft and the inner ring of the bearing. The size is long. If it is difficult to ensure the shape and position tolerance requirements, the middle section can be turned lower by less than 0.01mm to ensure that the size and shape and position tolerance of the bearing installation position meet the requirements of the drawing. 84.5 = (96.5-12.5-2), turn the back groove Ensure width 2, root rounding 2-R0.5; external thread M35×1 -0.03 -0.06 The tolerance refers to the tolerance of the outer diameter of M35, which is matched with the inner locking nut and the connecting plate, and the tightness should be appropriate; Guaranteed length 36 = (144-96.5-10-1.5); guaranteed total length 144 0 -0.2 , sharp edge chamfer 0.3×45°.

[0031] S7, CNC milling: Clamp and align according to the D view of the drawing, mill threaded holes 8-M2.5 evenly distributed, and ensure that the center of the circle is On the circle; milling threaded holes M2, thread depth 5 evenly distributed; milling notches to ensure size 4. 16-R2, 16-R1, depth 7.5, sharp edge chamfer 0.3×45°; turn around and clamp, mill 8-M4 threaded holes evenly, ensure that the center of the circle is On the circle, the effective depth of the thread is 6, and the sharp edge chamfer is 0.3×45°; use the EE view to clamp and align, mill four wiring grooves, and the edge of the hole should be carefully rounded to no less than R0.5, ensuring the size: 19.5, 7, 9, 2-R4.5;

[0032] S8, deburring: the burrs that cannot be removed after milling are removed by benchwork to obtain the finished titanium alloy shell;

[0033] S9, Inspection: Check the finished product according to the drawings;

[0034] S10, low temperature heat treatment: put the finished titanium alloy shell into a low temperature treatment furnace, cool it down to -60℃ at a rate of 20℃ / hour, keep it for 2 hours, and gradually increase the temperature after the insulation is completed to allow the titanium alloy shell to slowly return to room temperature. After full inspection, put it into storage.

[0035] Example 2

[0036] S1, pick up materials: pick up the raw materials for processing the titanium alloy shell according to the label;

[0037] S2, heat treatment: put the raw materials into the heat treatment furnace, start the heat treatment furnace, gradually increase the temperature, the heating rate is 150℃ / hour, when the furnace temperature reaches 750℃, the furnace temperature is stabilized at 750℃±10℃, keep warm for 1 hour, and cool with the furnace;

[0038] S3, number turning 1: clamp and align the heat-treated material, flatten the end face, turn the outer circle and inner hole, and make a 1mm allowance on one side; after completion, clamp and align the reverse side, flatten the total length and turn the inner hole, and make a 1mm allowance on one side;

[0039] S4, annealing: put the materials after several turns into the heat treatment furnace, preheat and heat up at a rate of 150℃ / hour. After heating to 600℃, stabilize the furnace temperature at 600℃±20℃, keep it warm for 1 hour, and cool it with the furnace;

[0040] S5, Counting and turning 2: Clamping and alignment, flat end face, turning the outer circle until all surfaces are visible, run-out < 0.03; precision turning the inner hole and end face; dimensions to be guaranteed: 1.5 = (144-132.5-10), 7.5, 91.5=(96.5-5), 2-R1, 32=(132.5-96.5+5-9), 6, 60°, 9, sharp edge chamfer 0.3×45°.

[0041] S6, lathe 3: align the material after lathe 2, clamp it in the tooling, and lathe the outer circle; ensure the size: 1.5 = (144-132.5-10), 5.5 = (10-4-1.5), To ensure that there is a clearance of 0.004-0.008mm between the shaft and the inner ring of the bearing. The size is long. If it is difficult to ensure the shape and position tolerance requirements, the middle section can be turned lower by less than 0.01mm to ensure that the size and shape and position tolerance of the bearing installation position meet the requirements of the drawing. 84.5 = (96.5-12.5-2), turn the back groove Ensure width 2, root rounding 2-R0.5; external thread M35×1 -0.03 -0.06 The tolerance refers to the tolerance of the outer diameter of M35, which is matched with the inner locking nut and the connecting plate, and the tightness should be appropriate; Guaranteed length 36 = (144-96.5-10-1.5); guaranteed total length 144 0 -0.2 , sharp edge chamfer 0.3×45°.

[0042] S7, CNC milling: Clamp and align according to the D view of the drawing, mill threaded holes 8-M2.5 evenly distributed, and ensure that the center of the circle is On the circle; milling threaded holes M2, thread depth 5 evenly distributed; milling notches to ensure size 4. 16-R2, 16-R1, depth 7.5, sharp edge chamfer 0.3×45°; turn around and clamp, mill 8-M4 threaded holes evenly, ensure that the center of the circle is On the circle, the effective depth of the thread is 6, and the sharp edge chamfer is 0.3×45°; use the EE view to clamp and align, mill four wiring grooves, and the edge of the hole should be carefully rounded to no less than R0.5, ensuring the size: 19.5, 7, 9, 2-R4.5;

[0043] S8, deburring: the burrs that cannot be removed after milling are removed by benchwork to obtain the finished titanium alloy shell;

[0044] S9, Inspection: Check the finished product according to the drawings;

[0045] S10, low temperature heat treatment: put the finished titanium alloy shell into a low temperature treatment furnace, cool it down to -120℃ at a rate of 10℃ / hour, keep it for 1 hour, and gradually increase the temperature after the insulation is completed to allow the titanium alloy shell to slowly return to room temperature. After full inspection, put it into storage.

[0046] Example 3

[0047] S1, pick up materials: pick up the raw materials for processing the titanium alloy shell according to the label;

[0048] S2, heat treatment: put the raw materials into the heat treatment furnace, start the heat treatment furnace, gradually increase the temperature, the heating rate is 130℃ / hour, when the furnace temperature reaches 750℃, the furnace temperature is stabilized at 750℃±10℃, keep warm for 1.5 hours, and cool with the furnace;

[0049] S3, number turning 1: clamp and align the heat-treated material, flatten the end face, turn the outer circle and inner hole, and make a 1mm allowance on one side; after completion, clamp and align the reverse side, flatten the total length and turn the inner hole, and make a 1mm allowance on one side;

[0050] S4, annealing: put the materials after several turns into the heat treatment furnace, preheat and heat up at a rate of 130℃ / hour. After heating to 600℃, stabilize the furnace temperature at 600℃±20℃, keep it warm for 1.5 hours, and cool it with the furnace;

[0051] S5, Counting and turning 2: Clamping and alignment, flat end face, turning the outer circle until all surfaces are visible, run-out < 0.03; precision turning the inner hole and end face; dimensions to be guaranteed: 1.5 = (144-132.5-10), 7.5, 91.5=(96.5-5), 2-R1, 32=(132.5-96.5+5-9), 6, 60°, 9, sharp edge chamfer 0.3×45°.

[0052] S6, lathe 3: align the material after lathe 2, clamp it in the tooling, and lathe the outer circle; ensure the size: 1.5 = (144-132.5-10), 5.5 = (10-4-1.5), To ensure that there is a clearance of 0.004-0.008mm between the shaft and the inner ring of the bearing. The size is long. If it is difficult to ensure the shape and position tolerance requirements, the middle section can be turned lower by less than 0.01mm to ensure that the size and shape and position tolerance of the bearing installation position meet the requirements of the drawing. 84.5 = (96.5-12.5-2), turn the back groove Ensure width 2, root rounding 2-R0.5; external thread M35×1 -0.03 -0.06 The tolerance refers to the tolerance of the outer diameter of M35, which is matched with the inner locking nut and the connecting plate, and the tightness should be appropriate; Guaranteed length 36 = (144-96.5-10-1.5); guaranteed total length 144 0 -0.2 , sharp edge chamfer 0.3×45°.

[0053] S7, CNC milling: Clamp and align according to the D view of the drawing, mill threaded holes 8-M2.5 evenly distributed, and ensure that the center of the circle is On the circle; milling threaded holes M2, thread depth 5 evenly distributed; milling notches to ensure size 4. 16-R2, 16-R1, depth 7.5, sharp edge chamfer 0.3×45°; turn around and clamp, mill 8-M4 threaded holes evenly, ensure that the center of the circle is On the circle, the effective depth of the thread is 6, and the sharp edge chamfer is 0.3×45°; use the EE view to clamp and align, mill four wiring grooves, and the edge of the hole should be carefully rounded to no less than R0.5, ensuring the size: 19.5, 7, 9, 2-R4.5;

[0054] S8, deburring: the burrs that cannot be removed after milling are removed by benchwork to obtain the finished titanium alloy shell;

[0055] S9, Inspection: Check the finished product according to the drawings;

[0056] S10, low temperature heat treatment: put the finished titanium alloy shell into a low temperature treatment furnace, cool it down to -100℃ at a rate of 15℃ / hour, keep it for 1.5 hours, and gradually increase the temperature after the insulation is completed to allow the titanium alloy shell to slowly return to room temperature. After full inspection, put it into storage.

Claims

1. A method for processing a titanium alloy shell, characterized in that: The following steps are involved: S1, pick up materials: pick up the raw materials for processing the titanium alloy shell according to the label; S2, heat treatment: put the raw materials into the heat treatment furnace, start the heat treatment furnace, gradually increase the temperature, the heating rate is 100-150℃ / hour, when the furnace temperature reaches 750℃, the furnace temperature is stabilized at 750℃±10℃, keep warm for 1-2 hours, and cool with the furnace; S3, number turning 1: clamp and align the heat-treated material, flatten the end face, turn the outer circle and inner hole, and make a 1mm allowance on one side; after completion, clamp and align the reverse side, flatten the total length and turn the inner hole, and make a 1mm allowance on one side; S4, annealing: put the material after several turning into a heat treatment furnace, preheat and heat it up at a rate of 100-150℃ / hour. After heating to 600℃, stabilize the furnace temperature at 600℃±20℃, keep it at that temperature for 1-2 hours, and cool it with the furnace; S5, Counting and turning 2: Clamping and alignment, flat end face, turning the outer circle until all surfaces are polished, run-out < 0.03; precision turning the inner hole and end face; S6, turning 3: After turning 2, the material is clamped and aligned on the tooling, and the outer circle is turned; S7, CNC milling: Clamp and align according to the D view of the drawing, mill threaded holes 8-M2.5 evenly distributed, and ensure that the center of the circle is On the circle; milling threaded holes M2, thread depth 5 evenly distributed; milling notches to ensure size 4. 16-R2, 16-R1, depth 7.5, sharp edge chamfer 0.3×45°; turn around and clamp, mill 8-M4 threaded holes evenly, ensure that the center of the circle is On the circle, the effective depth of the thread is 6, and the sharp edge chamfer is 0.3×45°; use the EE view to clamp and align, mill four wiring grooves, and the edge of the hole should be carefully rounded to no less than R0.5, ensuring the size: 19.5, 7, 9, 2-R4.5; S8, deburring: the burrs that cannot be removed after milling are removed by benchwork to obtain the finished titanium alloy shell; S9, Inspection: Check the finished product according to the drawings; S10, low temperature heat treatment: put the finished titanium alloy shell into a low temperature treatment furnace, cool it down to -60~-120℃ at a rate of 10~20℃ / hour, keep it for 1~2 hours, and gradually increase the temperature after the insulation is finished, so that the titanium alloy shell slowly returns to room temperature, and put it into storage after full inspection.

2. The method for processing a titanium alloy shell according to claim 1, characterized in that: When heat treatment is performed in S2, the heating rate is 130°C / hour.

3. The method for processing a titanium alloy shell according to claim 2, characterized in that: In the annealing step S4, the heating rate is 130°C / hour.

4. The method for processing a titanium alloy shell according to claim 3, characterized in that: In step S5, when performing the number turning 2, clamp and align, flatten the end surface, turn the outer circle until all surfaces are visible, and the runout is less than 0.03; fine turn the inner hole and end surface; the dimensions must be guaranteed: 1.5＝(144-132.5-10)、 7.5, 91.5=(96.5-5), 2-R1, 32=(132.5-96.5+5-9), 6, 60°, 9, sharp edge chamfer 0.3×45°.

5. The method for processing a titanium alloy shell according to claim 4, characterized in that: In step S6, when the outer circle is machined by number 3, the size is guaranteed: 1.5＝(144-132.5-10)、 3、 5.5 = (10-4-1.5), To ensure that there is a clearance of 0.004-0.008mm between the shaft and the inner ring of the bearing. The size is long. If it is difficult to ensure the shape and position tolerance requirements, the middle section can be turned lower by less than 0.01mm to ensure that the size and shape and position tolerance of the bearing installation position meet the requirements of the drawing. 84.5 = (96.5-12.5-2), turn the back groove Ensure width 2, root rounding 2-R0.5; external thread M35×1 -0.03 -0.06 The tolerance refers to the tolerance of the outer diameter of M35, which is matched with the inner locking nut and the connecting plate, and the tightness should be appropriate; Guaranteed length 36 = (144-96.5-10-1.5); guaranteed total length 144 0 -0.2 , sharp edge chamfer 0.3×45°.