A method for controlling the milling shape of TA32 high-temperature titanium alloy

Abstract

This invention discloses a milling shape control method for TA32 high-temperature titanium alloy, comprising the following steps: clamping the first surface of the part and determining its position coordinates; dividing the first surface into rectangular areas by rough machining to remove excess material; drilling holes at the four corners of the rectangular areas; creating "U"-shaped grooves along the outline of the rectangular areas; creating "X"-shaped grooves along the diagonal direction of the rectangular areas; and milling the remaining triangular outline material in the rectangular areas after milling to complete the rough machining of the first surface. Subsequently, clamping the second surface of the part and determining its position coordinates, and repeating the above steps, completes the rough machining of the second surface. This method is convenient to operate. Through a specific milling method design, it further achieves control over the rough machining deformation of TA32 high-temperature titanium alloy products, effectively controlling bending and deflection deformation, significantly reducing the scrap rate of raw materials due to uncontrollable deformation, simultaneously reducing raw material cost losses, and shortening the product manufacturing cycle.

Description

Technical Field

[0001] This invention relates to the field of CNC machining technology, specifically to a milling control method for TA32 high-temperature titanium alloy. Background Technology

[0002] In recent years, materials technology has developed rapidly abroad. Military-developed countries such as the UK, the US, and Russia have accumulated advanced experience and technology in the research and application of high-temperature titanium alloys. High-temperature titanium alloys like Ti60 / 55 have become important materials in the aerospace manufacturing industry of many countries, gradually becoming the preferred material for core load-bearing components due to their excellent physical and chemical properties. Domestically, due to the relatively short research and application cycle of high-temperature titanium alloy materials, there is a slight deficiency in processing technology reserves, and initially, they were mainly used for small and medium-sized parts. Now, with the development needs of the industry, high-temperature titanium alloy materials are gradually being promoted and applied to large and complex structural components in aerospace and other industries, becoming the preferred metal material for load-bearing components in high-temperature environments. However, in the actual processing, a very typical common problem has been exposed: large and uncontrollable deformation.

[0003] Taking a plate beam component made of TA32 high-temperature titanium alloy as an example, the plate beam's outline dimensions are 1330X420X220mm, and the thickness distribution range of the web, flange, and ribs is as follows: This is a typical double-sided grooved cavity structure. Based on past experience machining commonly used TA15 titanium alloy, the bending and deflection deformation after machining should be within 0.5mm. However, when machining the part using TA32 high-temperature titanium alloy, the actual deformation reached... A survey of major domestic high-temperature titanium alloy material processing manufacturers revealed that this problem exists and there is currently no effective solution. Analysis of the deformation shows that it mainly occurs during the roughing stage. Even with the most effective methods currently available, such as equal-height layer reduction and shallow cutting to uniformly distribute internal stress, the deformation still fluctuates greatly and is uncontrollable. This results in a large proportion of raw material scrap and delays the manufacturing process of TA32 high-temperature titanium alloy materials. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a milling control method for TA32 high-temperature titanium alloy.

[0005] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A milling control method for TA32 high-temperature titanium alloy, comprising the following steps:

[0006] S1: Clamp and position the first surface of the alloy part, and input the position of the part into the equipment system in the form of coordinate values;

[0007] S2: Divide the area according to the ribs of the part itself, and then divide the rough machining removal allowance into multiple rectangular areas;

[0008] S3: using a drill to drill four corners of the rectangular area and form a hole, while ensuring that the drill has a margin with the bottom surface of the part;

[0009] S4: using a milling cutter to open a "mouth" type groove along the contour line of the rectangular area, feeding and retracting the cutter from the drilled hole, and ensuring that there is a margin with the ground of the part, and sequentially completing the milling of all "mouth" type grooves of the rectangular area contour line;

[0010] S5: using a milling cutter to mill an "X" type groove along the diagonal direction of the rectangular area, feeding and retracting the cutter from the drilled hole, and ensuring that there is a margin with the ground of the part, and sequentially completing the milling of all "X" type grooves in the diagonal direction of the rectangular area;

[0011] S6: using a milling cutter to mill the remaining triangular contour structure margin of the rectangular area after steps S4 and S5, and ensuring that there is a margin with the bottom surface of the part, and sequentially completing the milling removal of the four triangular remaining margins of all rectangular areas;

[0012] S7: after the above operations are completed, the rough machining of the first surface of the part is realized, then the second surface of the part is clamped and positioned, and the position of the part is input into the equipment system in the form of coordinate values;

[0013] S8: repeat steps S2 to S6 to complete the rough machining of the second surface of the part;

[0014] S9: after the rough machining of the first surface and the rough machining of the second surface are completed, the part is disassembled, and thus the rough machining of the entire part is completed.

[0015] Further, when clamping and positioning the first surface of the part in step S1, the following steps are included:

[0016] S1.1: move the fixed clamp tool to the equipment table, use the dial indicator to straighten the tool edge, determine the tool position, use the pressing plate to press and fix the tool;

[0017] S1.2: move the part to align the positioning surface of the part with the tool positioning surface, insert the positioning pin into the positioning hole, if the part positioning hole does not coincide with the tool positioning hole, slightly push or knock the part with a wooden hammer until the part positioning hole coincides with the tool positioning hole, then insert the positioning pin;

[0018] S1.3: use the bolt to pass through the part process ear piece pressing hole, screw into the tool positioning table threaded hole, realize the fixation of the part.

[0019] Further, when clamping the second surface of the part in step S7, the following steps are included:

[0020] S7.1: Move the adaptive support tool to the equipment table, use the dial indicator to straighten the tool edge, determine the tool position, use the pressure plate to tighten and fix the tool with the bolts;

[0021] S7.2: Move the force plate beam part to make the positioning surface of the part match the positioning surface of the tool as much as possible, observe the mismatch caused by the deformation of the part after rough machining of the first surface, adjust the height of the universal head of the adaptive support tool until the part is completely matched in the stress-free state, tighten the tool limit bolts, slightly push or knock the part with a wooden hammer until the part positioning hole coincides with the tool positioning hole, and then the positioning hole is inserted into the tool positioning pin.

[0022] Further, when determining the position of the part in steps S1 and S7, the dial indicator is rotated around the positioning pin at the origin, the coordinate value of the origin is determined by the online coordinate reading capability of the machine tool, and is input into the equipment system.

[0023] Further, when drilling holes at the corners of the rectangular region of the part, a three-blade drill is used for drilling.

[0024] Further, in the drilling operation using the three-blade drill, if there is no effective specification drill bit, a drill bit smaller than the drill hole diameter is used to drill multiple holes in the triangular region constructed along the double sides of the rectangular region, ensuring that the actual drilling area covers the area of the single hole drilled by the drill bit of the specified diameter, and completing all the drilling of the corners of the rectangular region.

[0025] Further, the length of the rectangular region is a, and the diameter of the three-blade drill is D, which satisfies D≈a / 5.

[0026] Further, the milling cutter used in the above rough machining is a fast feed shallow cutting milling cutter.

[0027] The present application has the following advantages: the TA32 high-temperature titanium alloy milling shape control method provided by the present application is convenient to operate, and through specific milling method design, the deformation control of the TA32 high-temperature titanium alloy material product in rough machining is further realized, the bending deformation and deflection deformation are effectively controlled, the scrap rate of raw materials caused by uncontrollable deformation is greatly reduced, the raw material cost loss is simultaneously reduced, and the product manufacturing cycle is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 The flowchart of the present application;

[0029] Fig. 2 The processing process schematic diagram of the present application. DETAILED DESCRIPTION

[0030] The principles and characteristics of the present application are described below in conjunction with the drawings, and the examples are only used to explain the present application and are not used to limit the scope of the present application.

[0031] As shown in Figs. 1-2 A TA32 high-temperature titanium alloy milling shape control method, comprising the following steps:

[0032] S1: clamping and positioning the first surface of the alloy part, and inputting the position of the part into the device system in the form of coordinate values. When determining the position, use the dial gauge to rotate around the positioning pin at the origin, use the ability of the machine tool to read the coordinate values online to determine the origin coordinate values, and input them into the device system.

[0033] In addition, when clamping and positioning the first surface of the part in this step, the following steps are included:

[0034] S1.1: Move the fixed clamp tool to the device table, use the dial gauge to straighten the tool straight edge, determine the tool position, and use the pressing plate to press and fix the tool.

[0035] S1.2: Move the part to make the positioning surface of the part fit the tool positioning surface, insert the positioning pin into the positioning hole. If the part positioning hole does not coincide with the tool positioning hole, slightly push or knock the part with a wooden hammer to move until the part positioning hole coincides with the tool positioning hole, and then insert the positioning pin.

[0036] S1.3: Use the bolt to pass through the part process ear piece pressing hole, screw into the tool positioning table threaded hole, and realize the fixation of the part.

[0037] S2: Divide the area according to the part's own rib strip, and then divide the rough machining excess amount into multiple rectangular areas. According to actual use conditions and needs, the size of the rectangular area is different, such as a part with a groove structure, which can be determined as a rectangular machining area according to the part's own rib strip division area, and the side length of the rectangular area is ≤300mm.

[0038] S3: Use a drill to drill four corners of the rectangular area and form a hole, while ensuring that the drill has a margin between the drill and the bottom surface of the part.

[0039] The drill is preferably a three-blade drill. In specific operation, a three-blade drill is used to drill four corners of the rectangular area, and there is a 2mm margin outside the rectangular area to the rib strip; the three-blade drill has a 4mm margin to the bottom surface of the part, and the diameter D of the three-blade drill is approximately a / 5. When D≤40mm, a three-blade drill is used to drill a hole at the corner, and when the calculation shows that D>40mm, if there is no effective drill bit, a drill bit with a diameter <D can be used to drill multiple holes in the triangular area constructed along the double sides of the rectangular area, and the actual drilling area is required to cover the area of a single hole drilled by a D diameter drill bit. The diameter of the three-blade drill is D, which satisfies D≈a / 5.

[0040] S4: Use the milling cutter to open the whole circle "port" type groove along the rectangular area contour line, feed and retract from the drilled hole of the drill, and ensure that there is a margin with the ground of the part, and sequentially complete the milling of all the "port" type grooves of the rectangular area contour line. The milling cutter preferably uses a fast feed shallow cutting milling cutter, the tool diameter D1≤D-5mm, and the distance from the bottom surface of the part is 4mm margin, and the distance from the edge rib is 2mm margin.

[0041] S5: Use the milling cutter to mill "X" type groove along the diagonal direction of the rectangular area, feed and retract from the drilled hole of the drill, and ensure that there is a margin with the ground of the part, and sequentially complete the milling of all the "X" type grooves of the diagonal direction of the rectangular area. The milling cutter preferably uses a fast feed shallow cutting milling cutter, the tool diameter D1≤D-5mm, and the distance from the bottom surface of the part is 4mm margin.

[0042] S6: Use the milling cutter to mill the remaining triangular contour structure margin of the rectangular area after steps S4 and S5, and ensure that there is a margin with the bottom surface of the part, which is 4mm; sequentially complete the milling removal of the four triangular residual margins of all the rectangular areas.

[0043] S7: After the above operations are completed, the rough machining of the first surface of the part is realized, then the second surface of the part is clamped and positioned, and the position of the part is input into the equipment system in the form of coordinate values. The determination of the position is consistent with the method of determining the position of the first surface, and the original point coordinate value is determined by rotating the original point positioning pin using the dial gauge and using the online coordinate reading capability of the machine tool, and is input into the equipment system.

[0044] In this step S7, when clamping the second surface of the part, the following steps are included:

[0045] S7.1: Move the adaptive support tooling to the equipment table, use the dial gauge to straighten the tooling straight edge, determine the tooling position, and use the pressing plate to cooperate with the bolt to press and fix the tooling.

[0046] S7.2: Move the force bearing plate beam part to make the positioning surface of the part as close as possible to the tooling positioning surface, observe the non-fitting place caused by the deformation of the part after the rough machining of the first surface, adjust the height of the universal head of the adaptive support tooling, until the part is completely fitted in the stress-free state, tighten the tooling limiting bolt, slightly push or knock the part with a wooden hammer until the positioning hole of the part coincides with the positioning hole of the tooling, and the positioning hole penetrates into the tooling positioning pin.

[0047] S8: Repeat steps S2 to S6 to complete the rough machining of the second surface of the part.

[0048] S9: After the rough machining of the first surface and the rough machining of the second surface are completed, the part is disassembled, and thus the rough machining of the entire part is completed.

[0049] Embodiment: Take the TA32 material double-sided bearing plate beam part as an example, and describe the implementation steps of the patent as follows:

[0050] Step one: clamping the first side of the TA32 material double-sided bearing plate beam part

[0051] ① Move the fixed clamp tool to the equipment table, use the dial indicator to straighten the tool edge, determine the tool position, and use the pressing plate to cooperate with the bolt to press and fix the tool.

[0052] ② Move the bearing plate beam part to make the positioning surface of the part match the positioning surface of the tool, slightly push or knock the part with a wooden hammer, until the part positioning hole coincides with the tool positioning hole, and the positioning pin is inserted.

[0053] ③ Use the bolt to pass through the part process ear piece pressing hole, screw into the tool positioning table threaded hole, and fix the part.

[0054] ④ Rotate around the positioning pin at the origin using the dial indicator, use the ability of the machine tool to read the coordinate value online to determine the origin coordinate value, and input it into the equipment system.

[0055] Step two: rough machining of the first side

[0056] ① The double-sided bearing plate beam part has a rectangular cavity formed by the rib strip, and the length of the cavity is a≈400mm Divide the rectangular area with a length of more than 400mm into two rectangular areas, so that the length of all rectangular areas is ≤300mm, a total of 21 areas, after allocation, the rectangular length a≈300mm with the highest proportion is counted;

[0057] ② Use a three-edge drill to drill four corners of the rectangular area, with a 2mm margin from the rib strip; the three-edge drill has a 4mm margin from the bottom surface of the part, calculate the three-edge drill diameter D≈a / 5≈60mm, because D>40mm, there is no effective drill, combined with the existing tool situation, use a drill with a diameter of 30mm to drill six holes in the triangular area constructed along the double sides of the rectangular area, covering the area of the single hole drilled by a drill with a diameter of 60mm in theory, complete the drilling of the corners of the 21 rectangular areas.

[0058] ③ Use a fast feed shallow cutting milling cutter to open a whole circle "port" type groove along the contour line of the rectangular area, with a 4mm margin from the drilled hole, according to the tool diameter D1≤D-5mm, combined with the existing tool reserve, select a shallow cutting tool with a diameter of 32mm, with a 4mm margin from the bottom surface of the part and a 2mm margin from the rib strip, complete the milling of the "port" type groove of the contour line of the 21 rectangular areas.

[0059] ④ Use fast feed shallow milling cutter along the diagonal direction of the rectangular area to mill "X" groove, from the drill hole drilled by the drill bit, the cutter diameter D1≤D-5mm, combined with the existing cutter reserve, select the shallow cutting tool with diameter of 32mm, the distance from the bottom surface of the part is 4mm, complete the milling of 21 diagonal "X" grooves in the rectangular area.

[0060] ⑤ Use fast feed shallow milling cutter with diameter of 32mm to mill the four triangular contour structure remaining in the rectangular area after the processing of steps ② and ③, the distance from the bottom surface of the part is 4mm, complete the milling removal of the four triangular remaining structure in the 21 rectangular areas.

[0061] Step three: clamping and positioning the second surface

[0062] ① Move the adaptive support tooling to the equipment table, use the dial indicator to straighten the tooling straight edge, determine the tooling position, use the pressing plate to cooperate with the bolt to press and fix the tooling.

[0063] ② Move the force bearing plate beam part to make the positioning surface of the part and the tooling positioning surface as close as possible, visually observe the non-fitting place caused by the deformation of the part after the rough machining of the first surface, adjust the height of the universal head of the adaptive support tooling, until the part is completely fitted in the stress-free state, tighten the tooling limiting bolt, slightly push or knock the part with a wooden hammer until the part positioning hole and the tooling positioning hole are coincided, and the positioning hole is penetrated into the tooling positioning pin.

[0064] ③ Repeat ③ and ④ in step one to complete clamping and fastening, origin measurement and input.

[0065] Step four: rough machining of the second surface

[0066] Repeat steps ①, ②, ③, ④ and ⑤ in step two to realize the rough machining of the second surface.

[0067] Step five: disassemble the part, complete the rough machining of the whole part.

[0068] The above only describes the preferred embodiments of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of milling a TA32 high temperature titanium alloy, characterized by, It comprises the following steps: S1: clamping and positioning the first surface of the alloy part, and inputting the position of the part into the device system in the form of coordinate values; In step S1, the first surface of the part is clamped and positioned, comprising the following steps: S1.1: move the fixed clamp tool to the equipment table, use the dial indicator to straighten the tool straight edge, determine the tool position, use the pressing plate to cooperate with the bolt to press and fix the tool; S1.2: move the part to make the positioning surface of the part match the positioning surface of the tool, insert the positioning pin into the positioning hole, if the part positioning hole does not coincide with the tool positioning hole, slightly push or knock the part with a wooden hammer to move until the part positioning hole coincides with the tool positioning hole, then insert the positioning pin; S1.3: use the bolt to pass through the part process ear piece pressing hole, screw into the tool positioning table threaded hole, realize the part fixing; S2: divide the area according to the part's own rib strip, and then divide the rough machining removal amount into multiple rectangular areas; S3: use a drill to drill four corners of the rectangular area and form a hole, while ensuring that the drill has a margin between the part bottom surface; S4: use a milling cutter to open a "mouth" type groove along the rectangular area contour line, feed and retract from the drilled hole of the drill, and ensure that there is a margin with the part ground, and sequentially complete the milling of the "mouth" type groove of all rectangular area contour lines; S5: use a milling cutter to mill an "X" type groove along the diagonal direction of the rectangular area, feed and retract from the drilled hole of the drill, and ensure that there is a margin with the part ground, and sequentially complete the milling of the "X" type groove in the diagonal direction of all rectangular areas; S6: use a milling cutter to mill the triangular contour structure margin of the rectangular area after steps S4 and S5, and ensure that there is a margin with the part bottom surface, and sequentially complete the milling removal of the four triangular residual margins of all rectangular areas; S7: after the above operations are completed, the rough machining of the first surface of the part is realized, and then the second surface of the part is clamped and positioned, and the position of the part is input into the device system in the form of coordinate values; In step S7, the second surface of the part is clamped, comprising the following steps: S7.1: move the self-adaptive support tool to the equipment table, use the dial indicator to straighten the tool straight edge, determine the tool position, use the pressing plate to cooperate with the bolt to press and fix the tool; S7.2: move the force bearing plate beam part to make the positioning surface of the part match the positioning surface of the tool as much as possible, observe the non-matching part caused by the deformation of the first rough machining part, adjust the height of the universal joint of the self-adaptive support tool, until the part is completely matched in the stress-free state, then tighten the tool limiting bolt, slightly push or knock the part with a wooden hammer to move, until the part positioning hole coincides with the tool positioning hole, and the positioning hole is inserted into the tool positioning pin; S8: repeat steps S2 to S6 to complete the rough machining of the second surface of the part; S9: after the rough machining of the first surface and the second surface is completed, the part is disassembled, and thus the rough machining of the whole part is completed.

2. The TA32 high temperature titanium alloy milling contouring method of claim 1, wherein, In steps S1 and S7, the position of the part is determined by rotating the positioning pin around the origin using the dial indicator, determining the origin coordinate value by using the online coordinate value reading capability of the machine tool, and inputting the device system.

3. The TA32 high temperature titanium alloy milling contouring method of claim 1, wherein, When drilling the corners of the rectangular area of the part, a three-blade drill is used.

4. The TA32 high temperature titanium alloy milling contouring method of claim 3, wherein, In the drilling operation using a three-blade drill, if there is no effective specification drill bit, a drill bit smaller than the drilling diameter is used to drill multiple holes in the triangular area constructed along the two sides of the rectangular area, ensuring that the actual drilling area covers the area of the region theoretically drilled by a single hole using the drill bit of the specified diameter, and completing all the corner drilling of the rectangular area.

5. The TA32 high temperature titanium alloy milling contouring method of claim 4, wherein, The side length of the rectangular area is a, and the diameter of the three-blade drill is D, which satisfies D≈a / 5.

6. The TA32 high temperature titanium alloy milling contouring method of claim 1, wherein, The milling cutter used in the above rough machining is a fast-feed shallow-cut milling cutter.

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