High-precision involute spline broach and design method thereof

An involute spline, high-precision technology, applied in the direction of broaching tools, broaching machines, metal processing equipment, etc., can solve the problems of large accumulation of spline tooth profile, large outer diameter runout, processing quality problems, etc., to achieve lifting and pulling Cutting accuracy, broaching force reduction, and the effect of reducing workpiece deformation

Inactive Publication Date: 2021-01-15
XIAN FASHITE AUTOMOBILE TRANSMISSION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ra

Method used

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  • High-precision involute spline broach and design method thereof
  • High-precision involute spline broach and design method thereof
  • High-precision involute spline broach and design method thereof

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Embodiment

[0069] The involute spline broach of this embodiment and the related parameters of the spline to be processed are shown in Table 5. In combination with the exemplary content of the parameters shown in Table 1 in Tables 2 to 4, the method of the present invention is used to determine the broach Related parameters.

[0070] like Figure 1-2 As shown, the structure of the type 2 broach in this embodiment consists of a rear shank, a finish-drawing round hole, a finish-drawing spline, a rough-drawing spline, a rough-drawing round hole, a calendering guide tooth and a front Handle composition.

[0071] The difference between model 1 broaches and model 2 broaches is that model 1 broaches have no corresponding structure of calendered guide teeth, f R is the tooth lift of the rough-drawn circular hole tooth, and the corresponding structure of the rough-drawn circular hole tooth, f SR The tooth lift of fine-drawn spline teeth is 0.06-0.12mm, f C The tooth lift of the round hole toot...

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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...

Claims

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Application Information

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IPC IPC(8): B23D43/02
CPCB23D43/02
Inventor 金伟峰严鉴铂寇植达林欧
Owner XIAN FASHITE AUTOMOBILE TRANSMISSION CO LTD
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