High-precision involute spline broach and design method thereof

Abstract

The invention discloses a high-precision involute spline broach and a design method thereof. The high-precision involute spline broach comprises a calendaring guide tooth part, wherein the calendaringguide tooth part comprises a plurality of calendaring guide tooth rings that are concentrically arranged, the calendaring guide tooth rings are used for guiding a workpiece, and each calendaring guide tooth ring comprises a plurality of calendaring guide teeth that are annularly distributed; the outer diameter of a first tooth of the calendaring guide tooth is DY1, and DY1 is equal to D0l-delta;the outer diameter of the last calendaring guide tooth is DYN, wherein DYN=DYN+phi / 2, the tooth number NY of the calendaring guide tooth, and NY is equal to [(DYN-DY1) / fy]; D0l is the lower differenceof the hole before drawing of the workpiece, D0[mu] is the upper difference of the hole before drawing of the workpiece, delta is a guide gap, phi is a roundness error of the hole before drawing of the workpiece, fy is the tooth rise amount of the press polish guide teeth, and [] represents the nearby rounding of the result. According to a synchronizer thin-wall part machined by the structure, the procedure percent of pass is greatly increased, the machining quality of a workpiece is guaranteed, and meanwhile, due to separation of a rough broaching procedure and a fine broaching procedure, rough cutting teeth do not participate in final tooth profile forming, so that the cutting allowance of fine broaching teeth is small, and the service life of a broach is prolonged.

Description

technical field [0001] The invention relates to a cutting tool for machining, in particular to a high-precision involute spline broach and a design method thereof. Background technique [0002] Thin-walled parts originally use broaches, and the structure of the broaching part is generally in the following order: round hole guide → rough-drawn round hole → fine-drawn round hole → rough-drawn spline → fine-drawn spline. Due to the poor rigidity and easy deformation of thin-walled parts, after broaching with this structure, round holes and tooth grooves often have large tapers, and there are many special-shaped teeth in thin-walled parts, and splines often appear on the workpiece after drawing. The problem of large tooth profile accumulation and large outer diameter runout, the low pass rate of the process, seriously affects the processing quality of the parts. The usual improvement method is to keep the structure unchanged and reduce the tooth lift of the broach, but this met...

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Problems solved by technology

[0003] Aiming at the problems in the prior art that the workpiece after drawing often has a large accumulation of spline teeth and a large runout of the outer diameter, the pass rate of the process is low, and the processing quality problems and defects of the parts, the present invention provides a high-precision involute Spline broach and its design method

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