WO2020253818A1 - 一种大直径薄壁件的加工工艺 - Google Patents
一种大直径薄壁件的加工工艺 Download PDFInfo
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- WO2020253818A1 WO2020253818A1 PCT/CN2020/097053 CN2020097053W WO2020253818A1 WO 2020253818 A1 WO2020253818 A1 WO 2020253818A1 CN 2020097053 W CN2020097053 W CN 2020097053W WO 2020253818 A1 WO2020253818 A1 WO 2020253818A1
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- WIPO (PCT)
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- outer circle
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- machining
- finished product
- inner hole
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Classifications
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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
-
- 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
- B23P15/22—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cartridges or like shells
-
- 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
- B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
- B23P13/02—Making metal objects by operations essentially involving machining but not covered by a single other subclass in which only the machining operations are important
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
- B23Q3/065—Work-clamping means adapted for holding workpieces having a special form or being made from a special material for holding workpieces being specially deformable, e.g. made from thin-walled or elastic material
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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
- B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
- B23P2700/01—Aircraft parts
Definitions
- the invention relates to the field of mechanical processing and manufacturing, in particular to a processing technology of a large-diameter and thin-walled part of an aviation avionics kitchen and bathroom system.
- the structure of the large thin-walled pipeline of the aviation avionics kitchen and bathroom system is relatively complex, with a maximum diameter of 360mm, a total length of 560mm, and a minimum wall thickness of 1.3mm.
- the position of the hole on the flange surface of the workpiece is required to be higher than the inner hole of the workpiece.
- the part structure is asymmetrical, there are gaps, and it is easy to deform during the cutting process.
- the part material is selected as stainless steel 17-4PH.
- the material has high high-temperature strength and high-temperature hardness. The cutting force generated during the machining process, the surface work hardening, the chip is difficult to break, the sticking of the tool, accelerates the tool wear, and the cutting temperature is high.
- the structure is a thin-walled part, and the machining process is greatly affected by cutting force, clamping force, cutting temperature, etc., which will affect the dimensional accuracy and surface quality of the parts, resulting in large deformation and processing difficulties.
- the machining of this part, especially for milling needs to be processed in multiple processes, which cannot be completed at the same time under one clamping. This will increase the clamping time, and will also generate cumulative errors, which will affect the product accuracy and increase Machining time, product process efficiency is low.
- the technical problem to be solved by the present invention is to provide a process for processing large-diameter and thin-walled parts with convenient processing and improved accuracy.
- a processing technology of a large-diameter thin-walled part includes an axial inner hole, an outer circle on the outside, a flange on the outer circle, and Close to a plurality of bosses in the radial direction of the flange, the plurality of bosses and flanges divide the outer circle into a first outer circle and a second outer circle.
- the processing steps are as follows:
- the inner hole is processed by wire cutting on the raw material, and a machining allowance of 2 ⁇ 3mm is left on one side of the inner hole;
- step S4 Perform aging heat treatment on the semi-finished product obtained in step S3;
- step S11 The positioning surface in step S11 is downward, the inner hole is fixed by a hydraulic clamping fixture, and a pressure of 1.0-1.2Mpa is applied for clamping, and the process bosses are processed to form a plurality of bosses.
- the hardness of the aging heat treatment in the step S4 is controlled at HRC 34-42.
- the position of the first outer circle close to the first end, the position of the second outer circle close to the second end, and the process step close to the first end by turning between the steps S4 and S5 The position of the part is processed to the light for clamping.
- step S5 step S6, step S8, step S9, and step S10, a center frame is used to support the process steps.
- the pressure release is completed within 30 minutes after the processing in step S11 and step S12 is completed.
- the load of the main shaft in the processing process is controlled within 5.5 KW.
- the large-diameter thin-walled part is made of 17-4PH stainless steel.
- one of the two discs in the step S9 is provided with a tapered hole at its center, and the tapered hole is matched with a thimble.
- the beneficial effects of the present invention are: design a stable process route to control deformation, reduce the number of clamping, shorten the processing time, thereby improve the processing efficiency and ensure the product quality; through the inner hole positioning to complete all features on the basis of the specified clamping force
- the one-time processing ensures that the product deformation is within the controllable range; the use of reasonable process parameters to achieve accurate production guidance work, get rid of the limitations of special personnel and special machines, and better complete automated production; improve product process efficiency and product quality.
- FIG. 1 is a flowchart of the present invention
- Figure 2 is a schematic structural view of the finished product of the large-diameter thin-walled part of the present invention
- Fig. 3 is a structural schematic diagram of an intermediate state of the large-diameter thin-walled part of the present invention.
- a large-diameter thin-walled part processing technology the large-diameter thin-walled part includes an axial inner hole 5, an outer circle on the outside, a flange 3 on the outer circle, and a proximity method
- a plurality of bosses 4 in the radial direction of the flange 3, the plurality of bosses 4 and flanges 3 divide the outer circle into a first outer circle 1 and a second outer circle 2.
- the processing steps are as follows:
- the inner hole 5 is processed by wire cutting on the stainless steel material, and processed to the required size according to the actual size of the inner hole 5. Considering the heat treatment deformation and subsequent finishing, the inner hole 5 is left with 2 ⁇ 3mm machining allowance, this machining is rough machining.
- step S4 Perform aging heat treatment on the semi-finished product obtained in step S3, so that the hardness of the semi-finished product reaches HRC34-42.
- the first end 7 is held by the center frame for auxiliary support on the process step 6, and the visible area of the second outer circle 2 and the visible area of the process step 6 are verified by a dial indicator to ensure its roundness
- the runout is within 0.1mm.
- the inner hole 5, the second outer circle 2, the process step 6 and the second end 8 are semi-finished, and a machining allowance of 0.5-0.8mm is left.
- the semi-finished product is treated with natural aging, and the treatment time is 7-8 hours.
- the first end 7 of the semi-finished product is fixed by clamping the visible area of the first outer circle 1 by a three-jaw chuck, and at the same time, auxiliary support is provided on the process step 6 of the center frame clamping process, and the second outer circle Check the visible area on circle 2 to ensure that its circle runout is within 0.08mm. At this time, finish machining the inner hole 5 and the second end 8 to meet the dimensions required by the drawing.
- step S10 Turn the semi-finished product over, insert a disc without a tapered hole into the inner hole of the second end 8, and insert a disc with a tapered hole into the inner hole of the first end 7.
- the fixing method and verification method are as in step S9 , The second end 8 of the semi-finished product and the auxiliary support are fixed, and the first outer circle 1 is finished to the required size.
- the inner hole 5 is fixed by a hydraulic clamping fixture, and a 0.05mm plug is used to check whether the first end 7 and the bonding surface of the hydraulic clamping fixture fit in place.
- the hydraulic clamping fixture applies a pressure of 1.0 ⁇ 1.2Mpa to clamp, and then the end surface of the second end 8 is tested by a dial indicator to ensure that the runout is controlled within 0.1mm, and a hole is processed on the process step 6. And the positioning surface to form the flange 3; after finishing the processing, the pressure needs to be released in the hydraulic clamping fixture within 30 minutes.
- step S12 Place the positioning surface in step S11 downwards, the inner hole 5 is fixed by a hydraulic clamping fixture, and use a 0.05mm plug to check whether the second end 8 and the bonding surface of the hydraulic clamping fixture fit in place.
- the hydraulic clamping fixture applies a pressure of 1.0 ⁇ 1.2Mpa to clamp, and then uses a dial indicator to detect the end surface and circumferential direction of the second end 8 to ensure that the runout is controlled within 0.1mm, and the process step 6 is processed , Forming multiple bosses 4 and flanges 3 to the required size; after finishing processing, it is necessary to release the pressure within 30 minutes of the hydraulic clamping fixture.
- the spindle load of the whole machining process mentioned above is controlled within 25%, that is, within 5.5KW.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Forging (AREA)
Abstract
Description
Claims (8)
- 一种大直径薄壁件的加工工艺,所述大直径薄壁件包括轴向的内孔、外侧的外圆、位于外圆上的法兰以及靠近法兰径向上的多个凸台,多个所述的凸台以及法兰将外圆分为第一外圆与第二外圆,其特征在于,所述加工工艺的步骤为:S1、选取尺寸合适的原料;S2、在原料上采用线切割的方式加工内孔,并在内孔单边留有2~3mm的加工余量;S3、在原料的外侧的轴向以及径向方向上进行粗加工形成第一外圆、第二外圆、位于第一外圆与第二外圆之间的工艺台阶以及两个端部,均留有2~3mm的加工余量;S4、对步骤S3中得到的半成品进行时效热处理;S5、固定半成品的第一个端部,对内孔、第二外圆、工艺台阶以及第二个端部进行半精加工,并留有0.5~0.8mm的加工余量;S6、固定半成品的第二个端部,对第一外圆以及第一个端部进行半精加工,并留有0.5~0.8mm的加工余量;S7、对半成品进行自然时效处理,处理时间为7~8小时;S8、固定半成品的第一端部,对内孔以及第二端部进行精加工,达到要求尺寸;S9、在半成品两端部的内孔处分别各***一圆盘,固定半成品的第一端部,在半成品的第二端部通过顶针定位,对第二外圆以及工艺台阶进行精加工至要求尺寸;S10、将半成品翻转,固定半成品的第二端部,第一端部通过顶针定位,对第一外圆进行精加工至要求尺寸;S11、将半成品的第一端部朝下,内孔通过液压夹紧夹具进行固定,施加1.0~1.2Mpa的压力夹紧,在工艺台阶上加工孔以及定位面,形成法兰;S12、将步骤S11中的定位面向下,内孔通过液压夹紧夹具进行固 定,施加1.0~1.2Mpa的压力夹紧,将工艺凸台进行加工,形成多个凸台。
- 根据权利要求1所述的大直径薄壁件的加工工艺,其特征在于,所述的步骤S4中时效热处理的硬度控制在HRC34-42。
- 根据权利要求1所述的大直径薄壁件的加工工艺,其特征在于,在所述的步骤S4与步骤S5之间通过车削的方式对第一外圆靠近第一端部的位置、第二外圆靠近第二端部的位置以及工艺台阶靠近第一端部的位置加工至见光,用于夹持。
- 根据权利要求1或3所述的大直径薄壁件的加工工艺,其特征在于,在所述的步骤S5、步骤S6、步骤S8、步骤S9以及步骤S10采用中心架支撑于工艺台阶的位置。
- 根据权利要求1所述的大直径薄壁件的加工工艺,其特征在于,在所述的步骤S11与步骤S12中加工完成后在30min内完成压力的释放。
- 根据权利要求1所述的大直径薄壁件的加工工艺,其特征在于,在所述加工工艺中主轴的负载控制在5.5.KW以内。
- 根据权利要求1所述的大直径薄壁件的加工工艺,其特征在于,所述的大直径薄壁件采用17-4PH不锈钢材料加工而成。
- 根据权利要求1所述的大直径薄壁件的加工工艺,其特征在于,所述的步骤S9中的两个圆盘中的其中一个在其中心位置设置锥孔,所述的锥孔与顶针配合。
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GB2108394.4A GB2594182B (en) | 2019-06-20 | 2020-06-19 | Machining process for large-diameter thin-walled part |
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