A machining process for a high-temperature alloy thin-walled eccentric long-axis part

Abstract

The application provides a processing technology of a high-temperature alloy thin-wall eccentric long shaft type part, which comprises the following steps: step S1, straightening of a rod; step S2, rough turning of an end face and an outer circle; step S3, milling of a key groove; step S4, drilling of an eccentric deep hole; step S5, first straightening; step S6, turning correction of a lathe; step S7, honing; step S8, rough turning and rough milling; step S9, stress relief; step S10, second straightening; step S11, semi-finish turning; step S12, semi-finish milling; step S13, stress relief by ultrasonic vibration; step S14, third straightening; step S15, finish turning and finish milling; step S16, fourth straightening; step S17, electric pulse processing of a thread; and step S18, manual tapping of a thread. The processing technology of the high-temperature alloy thin-wall eccentric long shaft type part adjusts the drilling of the deep hole to the first part of the whole process, and the subsequent processing is carried out around the deep hole after the deep hole is drilled, so that the influence of the deep hole processing on the overall size of the part is effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the processing technology field of long axis type parts, and particularly relates to a processing technology of a high-temperature alloy thin-wall eccentric long axis type part. BACKGROUND

[0002] The high-temperature alloy eccentric long axis type part can work at a high temperature above 600 DEG C and under a certain stress for a long time, has high high-temperature strength, good oxidation resistance and corrosion resistance, good fatigue performance, fracture toughness and other comprehensive performance, and has a wide application in the energy and oil and gas fields. The material characteristics of the high-temperature alloy itself are difficult to process, and the thin-wall and deep-hole eccentric processing is prone to deformation, so that the product is difficult to process. SUMMARY

[0003] The present application aims at overcoming and supplementing the deficiencies in the prior art, and provides a processing technology of a high-temperature alloy thin-wall eccentric long axis type part. The high-temperature alloy thin-wall eccentric long axis type part produced by using the processing technology can fully meet the characteristics of the part, and effectively avoids the influence of the deformation of the part on the processing and the final product. The processing technology can be widely popularized in the processing of similar parts.

[0004] The technical scheme adopted by the present application is as follows:

[0005] A processing technology of a high-temperature alloy thin-wall eccentric long axis type part, comprising the following steps:

[0006] Step S1. Straightening of the bar material: the bar material is straightened by a hydraulic straightening machine to be within 0.25 mm, and a bar material one is obtained;

[0007] Step S2. Rough turning of the end face and the outer circle: the two end portions of the bar material one are sleeved with a turning tool clamping sleeve, and then at least two sections in the middle of the bar material one are turned to form lathe support positions, and a bar material two is obtained;

[0008] Step S3. Milling of the key groove: the bar material two is milled to form a key groove with a fixed rotation direction;

[0009] Step S4. Drilling of the eccentric deep hole: the key groove is clamped by a tool clamping sleeve to be fixed in the rotation direction, the two end turning portions are sleeved, and the eccentric deep hole is longitudinally processed by a deep hole drilling machine, and a bar material two is obtained;

[0010] Step S5. First straightening: the bent and deformed bar material two is re-straightened to be within 0.25 mm;

[0011] Step S6. Lathe correction: the ultrasonic thickness gauge is used to detect the minimum wall thickness of the bar material two relative to the eccentric deep hole, the actual minimum wall thickness detected is compared with the theoretical value, the difference is calculated, the lathe four claws are adjusted according to the difference, and the eccentric deep hole (2) is further corrected on the lathe by adjusting the lathe four claws;

[0012] Step S7. Honing: the eccentric deep hole of step S6 is honed in place to get bar stock three;

[0013] Step S8. Rough turning and rough milling: the minimum wall thickness of the eccentric deep hole of bar stock three is detected by using ultrasonic thickness gauge, the actual minimum wall thickness detected is compared with the theoretical value, the difference is calculated, the four jaws of lathe four are adjusted according to the difference, the excess amount is removed, the final product is left with 1mm excess amount on one side, and rough milling is performed to remove the excess amount, to get bar stock four;

[0014] Step S9. Stress relief: the bar stock four which is deformed by bending in step S8 is removed by ultrasonic vibration to remove processing stress;

[0015] Step S10. Second straightening: the long axis runout of the bar stock four which is removed of processing stress in step S9 is re-straightened to within 0.12mm;

[0016] Step S11. Semi-finish turning: the minimum wall thickness of the long axis relative to the deep hole is detected by using ultrasonic thickness gauge, the actual measured value is compared with the theoretical value, the difference is calculated, the four jaws of lathe four are adjusted according to the difference, the bar stock four is further removed of excess amount, to the final product left with 0.5mm excess amount on one side;

[0017] Step S12. Semi-finish milling: the small excess amount is further removed, to the final product left with 0.5mm excess amount on one side, to get bar stock five;

[0018] Step S13. Ultrasonic vibration stress relief: the bar stock five which is deformed by bending in steps S11 and S12 is vibrated by ultrasonic vibration stress relief equipment to remove material processing stress;

[0019] Step S14. Third straightening: the long axis runout of the bar stock five which is removed of processing stress in step S13 is re-straightened to within 0.12mm;

[0020] Step S15. Finish turning and finish milling: the bar stock five of step S14 is removed of the final small excess amount to the product size, to get bar stock six;

[0021] Step S16. Fourth straightening: the long axis runout of the bar stock six which is deformed by bending is re-straightened to within 0.12mm;

[0022] Step S17. Thread machining by electric pulse: the bar stock six of step S16 is machined with thread profile by electric pulse;

[0023] Step S18. Manual thread tapping: the thread is tapped in place by using tap in two passes by hand, to get the finished product.

[0024] Preferably, the processing technology of the high-temperature alloy thin-walled eccentric long axis type part, wherein: the excess amount is removed to the final product left with 1mm excess amount on one side after rough turning and rough milling in step S8.

[0025] Preferably, the high-temperature alloy thin-walled eccentric long shaft type part machining process, wherein: the ultrasonic vibration time in step S9 is 30-40 min.

[0026] Preferably, the high-temperature alloy thin-walled eccentric long shaft type part machining process, wherein: the ultrasonic vibration time in step S13 is 30-40 min.

[0027] Advantages of the present application:

[0028] (1) The high-temperature alloy thin-walled eccentric long shaft type part machining process of the present application, after finishing, drilling deep holes will inevitably lead to the deformation of the size characteristics of the finished part, so the drilling of deep holes is adjusted to the first part of the whole process, and after drilling deep holes, the subsequent machining is carried out around the deep hole, effectively avoiding the influence of deep hole machining on the overall size of the part.

[0029] (2) The high-temperature alloy thin-walled eccentric long shaft type part machining process of the present application, in the process of drilling deep holes, the drill tends to the thin wall side as it goes deeper, according to the tooling shown in Figure 1, the tooling is designed according to the eccentricity required by the part drawing at the entrance end of the drill, and the eccentricity is intentionally increased by 2mm at the exit end, effectively avoiding the tailing of deep holes.

[0030] (3) The high-temperature alloy thin-walled eccentric long shaft type part machining process of the present application, the high-temperature alloy eccentric long shaft type part is prone to bending deformation during machining, especially during milling and removing large excess, therefore, straightening processes are continuously inserted in the process route to ensure that the runout of the part before machining is always qualified, effectively avoiding the situation that the deep hole position degree becomes worse during machining.

[0031] (4) The high-temperature alloy thin-walled eccentric long shaft type part machining process of the present application, the high-temperature alloy eccentric long shaft type part is prone to accumulate machining stress during machining, therefore, an ultrasonic stress relief process is inserted to ensure that the machining process is not greatly affected by material stress.

[0032] (5) The high-temperature alloy thin-walled eccentric long shaft type part machining process of the present application, an ultrasonic thickness gauge is used to detect the minimum wall thickness of the part before each turning process, and the turning lathe four jaws are adjusted according to the comparison between the measured value and the theoretical value, effectively ensuring the deep hole position degree of each turning process.

[0033] (6) The processing technology of the high-temperature alloy thin-walled eccentric long shaft type part of the present application, because the finished product wall of the part is thin, the thinnest part is less than 1.2mm, therefore, three processes of rough milling, semi-fine milling and fine milling are adopted to remove the excess amount in turn until the finished product, and in the processing process, D16xR1.9, D12xR1.52 high-temperature alloy special coating nose milling cutter and D16 standard blade type ball head milling cutter are used, and the processing mode of keeping low speed of 600-750rpm and small feed of 150-250mmpm is always adopted, which effectively avoids the deformation of the thin wall;

[0034] (7) The processing technology of the high-temperature alloy thin-walled eccentric long shaft type part of the present application, the SPIRALOCK thread cannot be processed in a conventional way due to the structure interference on the part and the special tooth shape itself, therefore, the thread bottom hole is punched by electric pulse, the thread tooth shape is coarsely machined by electric pulse, and the thread tap specially made for SPIRALOCK thread is used to screw the thread in place in two processes of rough and fine, which effectively ensures the processing and qualified rate of the special thread on the special structure. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a side view of the high-temperature alloy thin-walled eccentric long shaft type part of the present application.

[0036] Figure 2 It is an A-A cross-sectional view of Figure 1 .

[0037] Figure 3 It is a front view of the high-temperature alloy thin-walled eccentric long shaft type part of the present application.

[0038] Figure 4 It is an F-F cross-sectional view of Figure 3 .

[0039] Figure 5 It is an R-R cross-sectional view of Figure 3 . DETAILED DESCRIPTION

[0040] The present application will be further described below in combination with specific drawings and examples.

[0041] Example 1

[0042] As Figures 1-5 , a processing technology of a high-temperature alloy thin-walled eccentric long shaft type part, comprising the following steps:

[0043] Step S1. Straightening of the bar: the bar is straightened by a hydraulic straightening machine to within 0.25mm, and a bar one is obtained;

[0044] Step S2. Rough turning end faces and outer circle: the two end portions of the bar stock one are turned smooth with the tool holder 1, and then at least two sections in the middle of the bar stock one are turned smooth to form lathe supports, to obtain bar stock two;

[0045] Step S3. Milling keyway: the bar stock two is milled to form a keyway with a fixed rotational direction;

[0046] Step S4. Drilling eccentric deep hole: the keyway is fixed in rotational direction by the tool holder 1, the portions of the two ends turned smooth are sleeved, and the eccentric deep hole 2 is longitudinally machined by a deep hole drilling machine, to obtain the bar stock two, Figure 2 the middle 4 is the inlet end of the drill bit of the deep hole drilling machine, 5 is the outlet end of the drill bit of the deep hole drilling machine, the eccentricity 6 of the bar stock two is 17.526, and the eccentricity 7 of the tool holder 1 on the right side is 19.526;

[0047] Step S5. First straightening: the bar stock two with bending deformation is straightened again to within 0.25 mm;

[0048] Step S6. Lathe correction: the minimum wall thickness of the bar stock two relative to the eccentric deep hole 2 is detected by using an ultrasonic thickness gauge, the actual minimum wall thickness detected is compared with the theoretical value, the difference is calculated, the lathe four-jaw chuck is adjusted according to the difference, and the eccentric deep hole 2 is further corrected on the lathe;

[0049] Step S7. Honing: the eccentric deep hole 2 of step S6 is honed to position, to obtain the bar stock three;

[0050] Step S8. Rough turning and rough milling: the minimum wall thickness of the eccentric deep hole 2 of the bar stock three is detected by using an ultrasonic thickness gauge, the actual minimum wall thickness detected is compared with the theoretical value, the difference is calculated, the lathe four-jaw chuck is adjusted according to the difference, and the excess amount is removed, to leave 1 mm excess amount on one side of the final product, and rough milling is performed, the excess amount is removed after rough turning and rough milling to leave 1 mm excess amount on one side of the final product, to obtain the bar stock four;

[0051] Step S9. Stress relief: the bar stock four with bending deformation after step S8 is subjected to ultrasonic vibration to remove machining stress, and the ultrasonic vibration time is 30-40 min;

[0052] Step S10. Second straightening: the long axis of the bar stock four with machining stress removed after step S9 is straightened again to within 0.12 mm; Step S11. Semi-finishing turning: the minimum wall thickness of the long axis relative to the deep hole is detected by using an ultrasonic thickness gauge, the actual value is compared with the theoretical value, the difference is calculated, the lathe four-jaw chuck is adjusted according to the difference, and the bar stock four is further removed to leave 0.5 mm excess amount on one side of the final product;

[0053] Step S12. Semi-finishing milling: the small excess amount is further removed, to leave 0.5 mm excess amount on one side of the final product, to obtain the bar stock five;

[0054] Step S13. Ultrasonic vibration stress relief: the bar material after step S11 and step S12 is vibrated by an ultrasonic vibration stress relief device to remove material processing stress, and the ultrasonic vibration time is 30-40 min;

[0055] Step S14. Third straightening: the bar material after step S13 is straightened again to be within 0.12 mm of the long axis runout;

[0056] Step S15. Fine turning and fine milling: the bar material after step S14 is removed to the final small excess amount to the product size to obtain bar material six;

[0057] Step S16. Fourth straightening: the bar material six after bending deformation is straightened again to be within 0.12 mm of the long axis runout; step S17. Thread processing by electric pulse: the bar material six after step S16 is processed by electric pulse to coarsely process the thread profile;

[0058] Step S18. Manual tapping: the thread 3 is manually tapped into place by using a tap in a coarse and fine two-pass manner to obtain the product.

[0059] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to examples, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A machining process for a thin-walled, eccentric long shaft-type part made of high-temperature alloy, characterized in that: Includes the following steps: Step S1. Bar straightening: Straighten the bar stock using a hydraulic straightening machine until it is within 0.25mm, thus obtaining bar stock one; Step S2. Rough machining of end face and outer circle: Machine the two ends of bar stock one to facilitate the insertion of tooling clamp (1), and then machine at least two sections in the middle of bar stock one to form a lathe support position, to obtain bar stock two; Step S3. Milling keyway: Mill a keyway with a fixed helix direction on the bar stock; Step S4. Drilling an eccentric deep hole: The keyway is clamped and the rotation direction is determined by the tooling clamp (1), and the machined parts at both ends are fitted in. The eccentric deep hole (2) is then longitudinally machined by a deep hole drilling machine to obtain bar stock two. Step S5. First straightening: Re-align the runout of the bent and deformed bar until it is within 0.25mm; Step S6. Lathe correction: Use an ultrasonic wall thickness gauge to detect the minimum wall thickness of the two relative eccentric deep holes (2) of the bar stock, compare the measured actual minimum wall thickness with the theoretical value, calculate the difference, adjust the lathe four jaws according to the difference, and further correct the eccentric deep hole (2) on the lathe by adjusting the lathe four jaws. Step S7. Honing: Honing the eccentric deep hole (2) from step S6 to the correct position to obtain bar stock three; Step S8. Rough turning and rough milling: Use an ultrasonic wall thickness gauge to detect the minimum wall thickness of the bar stock three eccentric deep hole (2), compare the measured actual minimum wall thickness with the theoretical value, calculate the difference, adjust the lathe four jaws according to the difference, remove the excess material, leave a 1mm allowance on one side of the final product, and rough mill to remove the excess material to obtain the bar stock four; Step S9. Stress relief: Remove the processing stress of the bar stock 4, which has been bent and deformed in step S8, by ultrasonic vibration. Step S10. Secondary straightening: The runout of the four major axes of the bar stock, which has undergone stress relief in step S9, is recalibrated until it is within 0.12mm; Step S11. Semi-finish turning: Use an ultrasonic wall thickness gauge to detect the minimum wall thickness of the long shaft relative to the deep hole. Calculate the difference by comparing the measured value with the theoretical value. Adjust the lathe jaws according to the difference to further remove the excess material from the bar stock until the final product has a 0.5mm allowance on each side. Step S12. Semi-finish milling: Further remove small allowances until the final product has a 0.5mm allowance on each side, resulting in bar stock five; Step S13. Ultrasonic vibration stress relief: The bar stock that has been bent and deformed in steps S11 and S12 is subjected to ultrasonic vibration stress relief equipment to remove the processing stress of the material. Step S14. Third straightening: The runout of the five major axes of the bar stock, which has undergone stress relief in step S13, is recalibrated until it is within 0.12mm; Step S15. Finish turning and finish milling: Remove the final small allowance from bar stock five from step S14 to the finished size to obtain bar stock six; Step S16. Fourth straightening: Recalibrate the runout of the six major axes of the bent and deformed bar until it is within 0.12mm; Step S17. Thread machining by electrical pulse: The bar stock from step S16 is rough machined into thread profile by electrical pulse. Step S18. Manual tapping: Use a tap to tap the thread (3) in two passes (coarse and fine) to obtain the finished product.

2. The processing technology for high-temperature alloy thin-walled eccentric long shaft parts according to claim 1, characterized in that: In step S8, after rough turning and rough milling, excess material is removed until the final product has a 1mm allowance on each side.

3. The machining process for high-temperature alloy thin-walled eccentric long shaft parts according to claim 1, characterized in that: In step S9, the ultrasonic vibration time is 30-40 minutes.

4. The machining process for high-temperature alloy thin-walled eccentric long shaft parts according to claim 1, characterized in that: In step S13, the ultrasonic vibration time is 30-40 minutes.

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