Holder assembly double threaded hole machining method and double-order single-screw tap used for same

Abstract

The invention discloses a double-order single-screw tap used for holder assembly double threaded hole machining. The tap comprises a first section part and a second section part which are connected into an integral formed structure; the first section part comprises a first-order tap, a tool withdrawal groove and a second-order tap which are connected into an integral formed structure; the front end of the first-order tap is provided with a front blade B, and the outer circumference of the first-order tap is provided with a first-order thread; the front end of the second-order tap is provided with a front blade A, and the outer circumference of the second-order tap is provided with a second-order thread; and the outer circumferences of the first section part and the second section part areprovided with flutes, and the rear part of the second section part is provided with a cutter handle. According to the tap, controllable batch machining of a machine tool is realized, the serious quality problems that double threaded holes are different in concentricity and not uniform in perpendicularity are solved, and the quality of the machined same set of matched products is guaranteed to be 100% qualified, which cannot be guaranteed by manual thread machining; and in particular, when threaded holes of a holder are more, the production mode of a matched supporting column is changed from traditional single selecting and matching to standardized batch production.

Description

technical field [0001] The invention relates to the technical field of cylindrical bearing cage processing, in particular to a method for processing double threaded holes of a cage assembly and a double-stage single-spiral tap used therefor. Background technique [0002] As a bearing manufacturing enterprise, especially in the process of producing bearing components, the cage is an extremely important part. In this category, the processing requirements for the component cage of the hollow cylindrical roller bearing are relatively special. The screw holes of the upper and lower cages The requirements are consistent, the verticality of the threaded hole is high, the inner height of the cage after assembly is required to be consistent, and the cylindrical roller is constrained by the cage, which directly affects the performance and product life of the bearing product. The resulting problem is as follows: [0003] 1. The screw holes of the upper and lower cages are processed. D...

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Problems solved by technology

[0003] 1. The screw holes of the upper and lower cages are processed. Due to the inconsistent specifications, the ordinary taps have a single specification and can only be processed separately. Drilling and tapping use ordinary drills and ordinary taps, and each piece of cage must be drilled in equal parts. , chamfering, tapping, etc., the processing cycle is long;

[0004] 2. The concentricity of the upper and lower threaded holes and the verticality of the end face have large errors, so that when the pillar is installed, the centerlines of the upper and lower threaded holes do not coincide, the installation is not smooth, and the pillar will be bent to varying degrees due to this influence; Cage performance;

[0005] 3. When the pillar is installed, due to the inconsistency between the thread of the pillar and the upper and lower screw holes of the upper and lower cages, after the pillar is installed, the inner spacing of the upper and lower cages is inconsistent, so that the gap between the end faces of the rolling elements is inconsistent, and even the rolling elements without gaps are caught. Clamping, affecting bearing rotation;

[0006] 4. In order to reduce the problem of plane distortion after the pillar is installed, use the pillar to select the processing mode separately, reduce the thread size, cause excessive production of the pillar, and the installation is not firm, increase the production of the pillar, and seriously affect the assembly time

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