Method for machining large-radius arc-section spiral groove

Abstract

The invention discloses a method for machining a large-radius arc-section spiral groove. The method combines enveloping machining with forming machining, the large-arc-radius spiral groove is machined in the mode that multiple small-arc-radius spiral lines are machined so that selection of cutter nose radiuses is not limited by the radius of a section needing to be machined, the cutting state is improved, cutting resistance and cutter breaking phenomena are reduced, and precise machining of the large-radius arc-section spiral groove is achieved. A small-diameter forming cutter is used, on one hand, a high linear cutting speed is achieved, a machined surface is strengthened, and surface quality is improved, and on the other hand, a curved surface enveloped by the small-diameter forming cutter has higher surface roughness. By means of numerical control programs, spatial arrangement precision of tiny-section spiral lines is controlled so that shape precision of a section arc of the spiral groove can be below 0.04 mm, and the size and position precision can be below 0.03 mm / 1000 mm. According to the method, the surface roughness of the machined spiral groove can be improved by increasing the number of the spiral lines enveloping the section arc of the spiral groove, and the highest surface roughness can be below Ra 0.8.

Description

technical field [0001] The invention relates to a precision machining method for forming a spiral groove in a large-radius circular arc section, in particular to a precision machining method for forming a spiral groove on the surface of a hoisting drum of a crane. Background technique [0002] There are spiral grooves on the surface of the hoisting drum of the crane. As the load demand continues to increase, the diameter of the crane wire rope continues to increase, and the radius of the cross-sectional arc of the spiral groove also increases. [0003] The machining of spiral grooves with circular arc sections has always been processed by forming method, that is, the arc radius of the tool is the same as the radius of the spiral groove section to be processed, and the shape of the spiral groove section is guaranteed by the shape of the sharpened tool tip. For spiral grooves with a section radius below 15mm, this processing method is adequate. For spiral grooves with a cross...

AI Technical Summary

Problems solved by technology

When there is a linkage requirement to precisely control the attitude of the load, the requirements for the size and shape accuracy of the spiral groove are extremely high, and casting molding is becoming more and more difficult to meet the requirements in terms of material and precision.

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