SU1634403A1 - A method for finishing rack wheels - Google Patents

Abstract

This invention relates to metalworking and can be used in the manufacture of gear wheels. The purpose of the invention is the expansion of technological capabilities by obtaining a longitudinal modification of the teeth. In order to obtain modified (barrel-shaped) teeth during wheel finishing with a disk shaver, in the initial position, the crossing angle of the tool and wheel axes is set equal to S arctg-tgS-a / (a + AS / sinan), where X is the nominal crossing angle of the tool axes and worked wheels, hail; a — center distance, mm; AS is the given barrel-shaped value (modification), mm; a.p - angle of engagement in normal section, hail. Then adjust the angle of the axis of the wheel to the direction of flow, and when the center of the crossing of the axes reaches the middle of the width of the gear to be processed, the direction of feed changes to. the opposite. Since during machining the angle of crossing of the axes is changed, a change in the axial distance of 2 slugs necessary for obtaining the modification of the teeth takes place. with Ј (L

Description

This invention relates to metalworking and can be used in the manufacture of gear wheels.

The purpose of the invention is the expansion of technological capabilities by obtaining a longitudinal modification of the teeth.

FIG. 1 shows a diagram of the initial position of the tool and the wheel to be machined; in fig. 2 is a diagram of the change in center distance when machining modified teeth.

When machining with a tool-shaver 1 with the axis of the wheel 2 being machined at an angle of 2 to the feed direction, the greatest allowance removal occurs at points P, which correspond to the plunging and exit of the shaver.

The angle Z is determined by the following relationship:

2 -arctg tg2. (5T3ar),

SiriOCn

where 2 is the nominal crossing angle of the tool axes and the wheel to be machined, degrees; a — center distance, mm; AS is the specified modification value, mm;

gc „- the angle of engagement in the normal section, hail.

At point P-2, the size of the removed allowance decreases due to an increase in the center distance. At the beginning of the machining cycle, the shaver 2 and wheel 1 are set so that the center of the crossing of the axes of the shaver and the wheel is located behind the end of the wheel and at the end of the tool (shaver).

Then, the processed wheel is reported to feed Snp along its axis and feed Sr normally to its axis. At the same time, the center of crossing of axes of wheel and wheel moves along line 3

OE GO

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About WITH

In order to make repeated passes, the shaver is informed about the feed along its axis until the center of the axes crosses to the opposite end of the tool, and the center of the axes crosses along the line 4. As the angle of the axes changes during processing, the necessary modifications are made (barrel-shaped) teeth change in center distance ().

Example. The machining of the spur gear with parameters Zi 35; fti 40 mm; shaver and barrel size AS 0.015 mm.

We determine the center distance a, and the value of c:

n 4 (35 + 53), 7 (. a mm;

c atg arccos (-. t,) |

 Sincn

 176tg arccosfa ,,, aG) I 3,47 1/0 G7 “op ° J

sin 20 °

Determine the angle of the diagonal feed:, 1735; .

Then we determine the angle of crossing of this shaver and the wheel being processed.

/ 116

(ZGN 15 ° (7bT

51PO.P

0.2678;

goa

sin20 °

E 14 ° 5.

In order to obtain a barrel-shaped modification, 015 the angle of crossing of the axes of the shaver and wheel in the initial position is set at 2 14 ° 5, and the wheel or tool

feeds 5 p and 5T or diagonal feed at an angle are reported until the center of intersection of the axes reaches the middle of the width of the processed crown fti / 2 20 mm and the intersection angle does not equal to the calculated value, then the direction of tangential feed is reversed .

ten

Claims (1)

Invention Formula The method of finishing gear wheels by the free rolling method with placing the wheel axis at an angle to the feed direction when the position of the center of crossing of the tool and wheel axes is changed, characterized in that, in order to expand technological capabilities by obtaining a longitudinal modification of the teeth, in the initial position the angle E the intersection of the tool and wheel axes is determined by the dependence Z arctg tgZ. but. a + d 51PO.P ). where 2 is the nominal crossing angle of the tool and wheel axes, degrees; a — center distance, mm; D5 - specified modification value, mm; and „- the angle of engagement in the normal section, hail, and the angle of the axis of the wheel to the feed direction is determined by the dependence 17 t but, and + -4 arccos sman one where ft 1 is the width of the gear ring, mm, In this case, when the center of the axes reaches the center of the width of the gear ring, the feed direction is reversed. etc Snp FIG. 7 Rig.2