Machining method for thin-wall shaft sleeve with two ends supported and middle suspended

A processing method and technology for thin-walled shafts, which are applied in the field of aero-engine assembly and processing, can solve the problems of the precise outer diameter of the bushing, the scrapped cylindricity, and the deformation of the bushing, so as to solve the problems of scrapped processing, high processing efficiency and high cost performance. Effect

Active Publication Date: 2018-03-16
AECC AVIATION POWER CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

The characteristics of the assembly structure of the bushing lead to the high-speed rotation of the grinding head during the grinding process of the bushing. When the bushing touches the suspended part, ...
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Method used

Adopt machine clip cutter, machine clip cutter compares blade with welding cutter and become independent functional element, and its cutting performance is improved; Blade and cutter body mechanical fixed positioning are reliable in stepping up; Have sufficient intensity, can bear cutting process Cutting force and impact, vibration, etc.
[0048] 3) The rake angle of the tool is 0°, whi...
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Abstract

The invention discloses a machining method for a thin-wall shaft sleeve with the two ends supported and the middle suspended. The machining method comprises the following steps of step 1, alignment, wherein both the runout of the front journal and the runout of the rear journal of an alignment rotor are smaller than 0.01 millimeter; step 2, rough turning, wherein rough turning is carried out on the excircle of a bush, and the single edge margin ranges from 0.10 millimeter to 0.15 millimeter; step 3, finish turning, wherein both the runout of the front journal and the runout of the rear journalof an alignment rotor are smaller than 0.01 millimeter, finish turning is carried out on the excircle of the bush, and the single edge margin of the part with the minimum diameter is 0.015 millimeter; step 4, chamfering, wherein chamfering is carried out on the sharp edge of the bush for 0.2 millimeter to 0.4 millimeter; step 5, checking, wherein both the runout of the front journal and the runout of the rear journal of an alignment rotor are smaller than 0.01 millimeter; step 6, finish grinding, wherein grinding is carried out on the excircle of the bush to the upper deviation; and step 7, precision polishing, wherein the bush is polished with abrasive paper for metallograph to guarantee the dimensions and the roughness of Ra 0.8, and then machining is completed. By adopting the machining method for a thin-wall shaft sleeve, with the two ends supported and the middle suspended, made of difficult-to-machine materials, the problems that a bush is scraped during machining, and measurement errors are large are successfully solved, the percent of pass of machined bushes reaches 100%, the efficiency is improved by 50%, and in a word, the machining method for a thin-wall shaft sleeve with the two ends supported and the middle suspended is high in efficiency and cost performance.

Technology Topic

Thin walledEngineering +4

Image

  • Machining method for thin-wall shaft sleeve with two ends supported and middle suspended
  • Machining method for thin-wall shaft sleeve with two ends supported and middle suspended

Examples

  • Experimental program(1)
  • Effect test(1)

Example Embodiment

[0033] Examples:
[0034] 1) Installation and alignment: Install the rotor on a horizontal lathe, and align the runout of the front and rear journals of the rotor to no more than 0.01mm.
[0035] 2) Rough turning: For the material of the thin-walled bushing parts, select the corresponding machine-added blade material and R, the outer circle of the rough turning bushing, with a margin of 0.10~0.15mm on one side.
[0036] 3) Finish turning: the runout of the front and rear journals of the positive rotor is not more than 0.01, the outer circle of the finish turning shaft sleeve, the blade number is VBGT160401-F1CP500, the feed amount is within 0.018-0.032, after each cut, it is on the outer circle of the shaft sleeve Mark the grid with a marker, and measure 6 sections in detail. Each section has 8 points of outer diameter, leaving a margin of 0.015mm on one side of the smallest diameter.
[0037] 4) Chamfering: Chamfer the sharp edge of the shaft sleeve 0.2-0.4mm.
[0038] 5) Check: Align the rotor outer circle and end face datum runout not more than 0.01mm.
[0039] 6) Fine grinding: Grind the outer circle of the sleeve to the upper deviation. Diamond grinding wheel BW100X40X20X3.5 80P100%
[0040] 7) Fine polishing: Use metallographic sandpaper to polish the shaft sleeve to ensure the size and roughness Ra0.8, and the width of the abrasive cloth during polishing is not more than 20mm. (Note: one continuous polishing should be controlled within 2 minutes)
[0041] 2. Material and geometric angle requirements of the tool
[0042] With the machine clamp tool, the machine clamp tool is an independent functional element compared with the welding tool, and its cutting performance is improved; the blade and the cutter body are mechanically fixed and positioned to be tightened and reliable; it has sufficient strength to withstand the cutting force of the cutting process And shock, vibration, etc.
[0043] (1) Material of the blade
[0044] The blade material is (Ti, Al)N+TiN, and the coating material grade is PVD.
[0045] (2) Blade geometry angle:
[0046] 1) The tool relief angle is 3.5°, and the smaller tool relief angle enhances the rigidity of the tool. Because the small sealed teeth (grooves) are relatively not deep, the smaller tool clearance angle has little effect on the friction between the flank face and the machined surface and can improve the tool rigidity.
[0047] 2) The angle of the tool is 0°, the contact area between the tool and the part is reduced by 75% during cutting, and the cutting force is reduced by more than 50%. This is the key to the design of the tool shape, which can effectively reduce the cutting force when meeting the requirements of the design drawing.
[0048] 3) The rake angle of the tool is 0°, which is convenient for sharpening, chip removal and strength improvement. Due to the complex cutting environment, the material is difficult to process, and there are hard spots in the material, the rake angle of the turning tool should be smaller to improve the strength of the cutting edge. The rake angle is determined to be 0° in accordance with the requirements of sharpening and chip removal.

PUM

PropertyMeasurementUnit
Width<= 20.0mm

Description & Claims & Application Information

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