SU1632662A1 - Finishing gear cutting tool - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to the manufacture of tools for machining gear wheels. The purpose of the invention is to simplify the operation of the tool. Along the tops of the working elements there are grooves, the bottom of which coincides with the cylindrical surface of the tops of the teeth of the most abraded tool, and the sides of the grooves are made along convex curved lines, i lit. p l l -j L L equidistant profile m opposite sides of work items. In the process of peretochki tool, such as a disk singer, from the sides of its teeth remove the allowance, the value of which on the side of the tooth is equal to D / 2. As a result, the regrinding of the tooth profile will be outlined by the Id - 1GL and 11P - IIn evolvents. After the second regrinding, the profile of Zoo and Hever will be delineated by the involutes T11L - Shd n 1PP - HTJ ,. These operations are repeated within the allowance $ for regrinding of the tool. For example, the coordinates of key points 1L, Id, etc., In, IIn, etc. are determined graphically. on the tops of eubiech and along them, shaped grooves are made. When using such a tool, it is not necessary, when regrinding it, to produce a round external grinding of the teeth to ensure the correct geometrical dimensions of the teeth of the tool. 2 Il. (L O5 co 05 o o to de. "S & - b

Description

The invention relates to mechanical engineering, in particular to the manufacture of tools for machining gears.

The purpose of the invention is to simplify the operation of the tool.

Figure 1 shows the tooth profile of the finishing tool; FIG. 2 shows a fragment of a tooth of an instrument, for example, a disk shaver, and a scheme for regrinding it.

The finishing gear cutting tool includes a housing 1, on which the working elements 2 are located with non-working vertices 3 and the rear surfaces of the 4 sides of the tooth profile that are being turned around. The grooves 5 are made along the tops of the working elements. The bottom of the 6 grooves 5 coincides with the cylindrical surface of the teeth tops of the most abraded tool, whose diameter is LLLIN. The sides 7 of the grooves 5 are made on convex curved lines, equidistant profile of the opposite sides of the work items. This condition follows from the following. Consider a tooth shaver tooth, the involute profile of which in a parametric form can be written as

1 (Ha) v0 / - derivative of the X curve of the side of the groove.

Derivatives of X and Y on V are respectively equal

and

(3)

(four)

(four),

ontg V,

(five)

To derive the equation for the curve of the line along which the lateral stitch of the grooves is made, we transform the formula (2) to a convenient form,

Tie.) "

Using the expression tg (a + b)

sought equation

curve lines can be written YgCXj) tg (V + tf),

(7)

 year

 g

(cos v + v (sin v - v

sin v); cos v)

(one)

- radius of the main cylinder

tool; - curvilinear coordinate

involute profile; - coordinates of the current point on the side surface of the profile of work items.

The side of the groove and the adjacent side of the working elements of the tool are curved lines, the angle between which is unchanged from regrind to regrind and is determined from

/

(X0) - Y, (Ho).

G + Y ())

(2)

where Y | (XO) is derived from the X curved line profile of the sides of the workers

elements;

Therefore, for tools for processing involute tooth profiles, the parts of the sides of the profile of the grooves are made according to involutes, equidistant evolvents of the opposite sides of the working elements and they can be written

X g

tool,

cos (V

+1 |) sin (v +

 (V + tp) + (f) + (v +

);

(v +

Cf)

cos

v +)

(eight)

In the process of regrinding, for example, a disk shaver, from the lateral sides of the profile of its teeth, the allowance is removed, the value of which is equal to & 2 on the side of the tooth. As a result, the tooth profile will be delineated by involutes.

14ni

and - 11P. In order to maintain a constant height of the tooth head, it is necessary to reduce the diametral dimensions of the tool,

Claims (1)

Claim A finishing gear-cutting tool containing working elements located on the initial tool surface, the tooth profile of which is intended for grinding on the rear surface of the sides of the profile, characterized in that, in order to simplify the operation of the tool, grooves are made along the vertices of the working elements, the bottom of which coincides with a cylindrical surface of the tops of the teeth, the parameters of which correspond to the parameters of the most sharpened tool, 25 and the sides of the grooves are made equidistant yakov side profile of opposite sides of work items. Figure 1