CN2138537Y

CN2138537Y - Gear cutter for round arc inner gear

Info

Publication number: CN2138537Y
Application number: CN 92232794
Authority: CN
Inventors: 张铁城; 刘继岩; 崔正昀
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-12
Filing date: 1992-09-12
Publication date: 1993-07-21
Anticipated expiration: 2002-09-12

Abstract

The utility model relates to a gear cutter for processing circular arc internal gears. The tooth profile of the gear cutter is an inclined cylinder; a tooth profile curve is composed of a circular arc and a transition arc which is tangential with the two endpoints of the circular arc. The front angle of a top cutting edge is from 5 DEG to 8 DEG; the back angle of the top cutting edge is from 2 DEG to 6 DEG. A cutter body forms a disk shape, a bowl shape and a taper shank shape, and the cutter body is made of alloy tool steel. The utility model has the advantages of constant dimensional precision of a circular arc and long service life of the cutter.

Description

Gear cutter for round arc inner gear

The utility model relates to a kind of cutting tool of generate slotting arc inner gear.

For a long time, the processing of arc inner gear is on special drill press, with indexing mechanism and drill jig hole successively, reaming, fraising, again on lathe turning to semicircle.The dimensional accuracy of this method processing is low, productivity ratio is low, and labour intensity is big.

In recent years, adopt the processing of pinwheel pin-and-hole pinion cutter generate, the workpiece of pinwheel pin-and-hole pinion cutter processing, the dimensional accuracy and the accuracy of form and position all have raising than preceding method, and productivity ratio improves more than the twice.But the cutter tooth profile of tooth of pinwheel pin-and-hole pinion cutter is Zheng Yuantai, the cutter tooth tooth curve is formed by semi arch with tangent two straightways of semi arch two-end-point, therefore, has the following disadvantages: 1. tool wear, garden arc size is by diminishing greatly gradually, and the garden arc dimensional accuracy of generate processing changes; 2. after the tool sharpening, garden arc radius diminishes on the cutter tooth end section, when current edge clearance angle is 2 °～5 °, for guaranteeing garden arc dimensional accuracy in the scope that tolerance allows, but the axial dimension of cutter sharpening between 0.2～0.5mm, thereby cutter life is short.

Be to solve the existing the problems referred to above of pinwheel pin-and-hole pinion cutter, the utility model proposes a kind of on gear shapping machine the arc inner gear pinion cutter of generate processing arc inner gear.

The alleged arc inner gear pinion cutter of the utility model is to be made of alloy tool steel cutter hub and the cutter tooth that is distributed on the cutter hub, the cutter tooth profile of tooth is the oblique circular cylinder body, cutter tooth end section tooth curve by the circular arc of radius R=2.5～10mm and with the tangent radius of this circular arc two-end-point be that the transition arc of r=1.5～2.5mm is formed cutter tooth top angle of cutting edge γ _a=5 °～8 °, top relief angle α _a=2 °～6 °, the cutter tooth tooth number Z ₀=7～31.The structure of the cutter body form is a dish type, bowl-type and taper shank shape.

The cutter hub material adopts alloy tool steel, is heat-treated to HRC63～66, and the cutter manufacturing technology requires to press GB6082-85 standard A class precision pertinent regulations.

Adopt the alleged arc inner gear pinion cutter of the utility model that following effect is arranged: 1) this pinion cutter is installed on the gear shapping machine, and the arc size precision of the arc inner gear of usefulness generating slotting is invariable; 2) behind the cutter tooth sharpening, tip circle diminishes, but cutter tooth arc radius size constancy, the radial feeds of adjustment gear shapping machine, the arc size of the arc inner gear of generate processing is still invariable, as top relief angle α _aIn the time of=2 °～5 °, but the axial dimension of cutter tooth front sharpening between 4～8mm, cutter life improves greatly; 3) processing technology of cutter cutter tooth improves, and has reduced the cost of cutter.

The utility model embodiment (seeing accompanying drawing):

In the present embodiment, cutter hub adopts disk-shaped structure, and the cutter hub material is W6M ₀5Cr4V ₂, flank profil arc radius R=4 ^{+ 0.03} _{+ 0.02}, transition arc radius r=2.5mm, sword tooth center circle footpath d ₀=24.33mm, cutter tooth tip diameter d=32.33mm, cutter hub thickness H=20mm, top angle of cutting edge γ _a=5 °, top relief angle α _a=2 °, bulk heat treatmet HRC63～66, all the other technical conditions are pressed G86082-85 standard A class precision regulation.

Fig. 1-arc inner gear pinion cutter structure chart

Among the figure: 1-dish type cutter hub; The 2-cutter tooth;

γ _a-top angle of cutting edge, α _a-top relief angle; d ₀-cutter tooth center circle diameter;

D-cutter tooth tip diameter; H-cutter hub thickness.

Fig. 2-arc inner gear pinion cutter end section cutter tooth tooth curve

Among the figure: R-circular curve radius; R-transition arc sweep;

A, b-radius are the two-end-point of the circular arc of R.

Claims

1, arc inner gear pinion cutter, it is to be made of alloy tool steel cutter hub and the cutter tooth that is distributed on the cutter hub, it is characterized in that;

1) the cutter tooth profile of tooth is the oblique circular cylinder body,

2) the cutter tooth tooth curve by radius be R circular arc and with the tangent radius of this circular arc two-end-point be that the transition arc of r is formed,

3) cutter tooth flank profil arc radius R=2.5～10mm, transition arc radius r=1.5～3.5mm,

4) cutter tooth top angle of cutting edge γ _a=5 °～8 °, top relief angle α _a=2 °～6 °,

5) cutter tooth tooth number Z ₀=7～31.

2, by the cutter hub of the said arc inner gear pinion cutter of claim 1, it is characterized in that,

1) dish type cutter hub,

2) bowl-type cutter hub,

3) taper shank shape cutter hub.