SU1606768A1 - Sliding-contact guideways - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in metal-cutting machines and other machines for the straight-line movement of components. The purpose of the invention is to increase the durability and accuracy of movement of the guides. In the sliding guides, the movable element is made in a cross section of a T-shaped form. On the fixed element, along the entire length, there is a rectangular groove in which the plate is fixed, which is in contact with the corresponding plane of the movable element. The wear-resistant inserts protruding along the length of the movable element are fixed, and the inserts width is chosen from the inequality 0.5A * 98BΑ, where B is the inserts width

A is the width of the guides. 2 hp f-ly, 3 ill.

Description

The invention relates to mechanical engineering and can be used in metallolotting machines and mechanisms to provide a straight-line displacement of components

The aim of the invention is to increase the durability and accuracy of movement of the guides.

FIG. 1 shows the guides, a general view; in fig. 2 is a section A-A in FIG. one; Fig 3 is a diagram of the operation of the Yush directions;

Slide guides have a movable element 1, the cross section of which has a T-shape. At the ends of the base element on the lower rectangular protrusion in the middle part of the section, one wear-resistant insert 2 is fixed, each insert 2 stands for the dimension of the length of the guideline by the value h.

On the fixed element 3 there is a rectangular groove in which a wear-resistant lining 4 is fixed, matched with a wear-resistant insert.

Sliding guide works as follows.

At the initial moment of movement or when the direction of movement changes, the driving force of the drive and the frictional force (fig 3) form the moment turning the movable element 1 relative to the fixed element 3 at a very small angle and determined by the rigidity of the drive and the gaps in the joint Due to the rotation of element 1 the joint in plane B is cleaved (and 3), the area of the contact element decreases, and the specific contact pressure increases, at the S area of the wear-resistant insert.

O5

about

05

O5 00

The inserts protruding along the length of the movable element preserve the planes B from increased and uneven wear at the moment of the occurrence of maximum contact pressures at sites S

The magnitude of the allowable linear wear and the structurally specified angle of rotation of the movable element determine the geometrical parameter h, which ensures the condition of opening the junction of the plane B to a certain state of wear of the guides. The parameter of the moving element h is determined by the formula

h

sinei

where I is the allowable linear wear

an item;

oL- maximum angle of angle of one of the ends of the moving element

To ensure the opening of the joint in planes B of the guides, the value of h must be in the range of 5-10 mm.

In the process of steady motion, when the coefficient of friction sliding is stable (at the initial moment of movement, the coefficient of friction rest is significantly greater than the coefficient of friction sliding), the force of friction decreases and the planes of the moving element come into contact with the corresponding planes of the fixed element.

In this case, the specific contact pressure in the elements is significantly reduced and the sliding process proceeds in an optimal operating mode.

The specific contact pressure in the planes of the guides depends on the width of the plane B (the width of the inserts), which is chosen in accordance with the inequality

0.5 a b i i a, where a is the width of the directions.

Durability and accuracy of movement are ensured by the planes B of the elements, which are operated under lighter conditions, and the distribution of the external load acting at the time of rotation of the moving element.

with

Yu J5

20

25

zo

ds

35

40

50

55

 Achieved by assigning geometric parameters h, a, b.

Even wear along the entire length of the planes B ensures the necessary movement accuracy over the entire service life. Uneven lengthwise wear of the wear-resistant inserts and lining is restored by periodically replacing them.

Claims (1)

Invention Formula 1 o Slide guides, containing fixed and movable elements, wear-resistant inserts fixed at the ends of the movable direction south-. the wear-resistant lining, which is made of the fact that, in order to improve durability and accuracy of movement, the stationary element is made with a rectangular groove transverse to the direction of movement of the section, wear-resistant - the plate is installed in the said groove, the movable element is with a T-shaped cross section, and each wear-resistant insert is made with a piece behind the corresponding end of the moving element, and the friction surface of the inserts is matched with the friction surface of the wear-resistant lining, 2c. Sliding guides according to Claims 1, characterized in that the size of the part of each wear-resistant protruding part of the wear element is determined from the ratio , sinoC where I is the maximum linear wear guides; the maximum angle between the friction surfaces of the movable and stationary elements at one of the ends of the movable element. Direction of slip on p, 1, characterized in that the width of the wear-resistant insert is determined from the condition 0.5 a b: a, where b is the width of the insert; a is the total width of the guides. Fi9.1 FIG. 2 / y7i; af / xy // XX // W / Fig.Z Compiled A ,, Dolinsky Editor A. Lezhnina Tezfed M.Diedgk. Proofreader A. Osaulenko . Order 3540 Circulation 524 YNIIPI State Committee for Inventions and Discoveries under the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production and Publishing Combine Patent, g, Uzhgorod, st. Gagarin, 101 Subscription