RU114901U1 - DEVICE FOR BILATERAL GRINDING OF PARTS END - Google Patents

Abstract

1. A device for double-sided grinding of the ends of parts, containing two oppositely located grinding wheels and a rotating loading disk-separator with a device for installing workpieces in the form of bushings located circumferentially on the periphery of the disk, characterized in that each sleeve has a lubricating pocket located on the inner surface of the sleeve in the zone of maximum load acting on the surface of the sleeve from the side of the grinding wheels in the process of simultaneous grinding of two opposite ends of the part located in the sleeve, with the possibility of supplying a lubricating fluid to the lubricating pocket under pressure. ! 2. The device according to claim 1, characterized in that the angular position of the grease pocket is determined by calculation based on the geometric parameters of the machine tool.

Description

The invention relates to the field of mechanical engineering, in particular to grinding the ends of cylindrical parts such as roller bearings.

A device for two-sided finish machining of the ends of cylindrical parts, containing two rotating abrasive wheels and a rotating boot disk with a device for installing parts in the form of bushings located around the circumference of the disk (see RF patent No. 2264904, IPC V24V 7/17, publ. 2005.11.27 )

Also known is the closest in technical essence to the claimed device for double-sided grinding of the ends of the parts, containing two opposed grinding wheels and a rotating loading disc-separator with a device for installing workpieces in the form of bushings located around the circumference on the periphery of the disk (Modeling of technological processes of abrasive processing Monograph. / G.V. Barsukov, L.G. Weiner, Yu.V. Vasilenko and others; Edited by Yu.S. Stepanov and A.V. Kirichek - M .: Publishing House "Spectrum", 2011 p. 64-65).

The disadvantage of the described devices is that in the process of two-sided machining of the ends of the parts there is intense and substantially uneven wear of the base cylindrical surfaces of the bushings of the boot disk - separator, which reduces the accuracy of the machined ends and causes premature replacement of the bushings. The reason for the intensive wear is significant variable loads and sliding speeds in the contact zone of the sleeve and the part, on the one hand, and the difficulty of dropping coolant in the gap between the sleeve and the part, on the other. At the same time, the necessity of creating conditions for the stable rotation of parts during processing to reduce the errors of the machined ends is proved.

The technical problem to which the utility model is directed is to increase the accuracy of machining the ends of the parts and reduce the cost of replacing the installation elements (bushings) of the loading disc-separator.

The solution to this problem is achieved by the fact that in the device for double-sided grinding of the ends of the parts, containing two opposed grinding wheels and a rotating loading disc-separator with a device for installing workpieces in the form of bushings located around the circumference on the periphery of the disk, according to the utility model, in each a lubricant pocket is provided on the sleeve located on the inner surface of the sleeve in the area of maximum load acting on the surface of the sleeve on the side of the grinding wheels in the process of simultaneous grinding of two opposite ends located in the sleeve of the part, with the possibility of feeding into the lubricant pocket under the pressure of the cutting fluid. In addition, the angular position of the lubrication pocket is determined by calculation based on the geometric parameters of the machine setup.

The presence of a lubricating pocket located on the inner surface of the sleeve in the zone of maximum load allows you to reduce the wear of the cylindrical surface of the sleeve in which the workpiece is located during grinding, as well as create favorable conditions for its rotation and, accordingly, reduce the processing error.

The angular position of the lubricant pocket calculated for the proposed device, based on the geometrical parameters of the machine setup, allows optimizing the flow of the lubricating-cooling process fluid into the wear zone of the sleeve and increasing the accuracy of machining the part - roller.

The essence of the utility model is illustrated by drawings, where Fig. 1 shows a diagram for determining the angular position of a lubricant pocket; figure 2 is a General view of the sleeve, with an angled lubricating pocket; figure 3 is an axial section of the sleeve.

A device for double-sided grinding of the ends of the parts, contains two opposed grinding wheels 1 and a rotating loading disc-separator 2 with a device for installing the machined parts 3 in the form of bushings 4, located around the circumference on the periphery of the separator disk. Each sleeve 4 has a lubricating pocket 5 located on the inner surface of the sleeve 4 in the maximum load zone acting on the surface of the sleeve 4 from the side of the grinding wheels 1 during the simultaneous grinding of two opposite ends of the part 3 located in the sleeve 4, for example, a roller bearing roller. In the lubricating pocket, the cutting fluid is supplied under pressure through a cylindrical hole in a known manner. The angular position of the lubricant pocket 5 is determined by calculation, based on the orientation of the loading zone of the sleeve 4, with the given geometric parameters of the machine setup (see figure 1). The main calculated dependencies are given below.

Lubrication pocket angle

θ = π / 2-φ _K- φ

Where

φ = (φ ₁ + φ ₂ ) / 2

- the angular coordinate of the middle of the stock removal zone and, accordingly, the action of the tangential cutting forces;

φ ₁ and φ ₂ are the angular coordinates of the boundaries of the zone of action of the cutting forces

,

;

.

Here α and γ are the angular displacements (carried out during adjustment) of the axes of the grinding wheels in the vertical and horizontal planes, respectively.

So, for the given setup parameters, R _в = 0.207 m, R _к = 0.225 m, а = 0.365 m, tg φ ₂ = -0.1 φ ₁ = 34 °, φ ₂ = -6 °, φ = 20 ° and the position of the lubricant pocket is determined by an angle θ≈62 °.

The device operates as follows.

Cylindrical parts 3, for example, rollers of rolling bearings, are loaded into bushings 4 of a rotating loading disc-separator 2, with which parts 3 are fed between two rotating in one direction tools - grinding wheels 1 for processing. In this case, the supply of parts 3 for processing between grinding wheels 1 is carried out by rotating the loading disc-separator 2 (rotation speed 4-8 rpm). At the moment of touching the end surfaces of part 3 with the working end surfaces of the grinding wheels 1, part 3 begins to be processed with rotation in the sleeve 4. Under the action of cutting forces, part 3 is pressed against the sleeve in the area of the grease pocket 5. Simultaneously through the grease pocket 5 under pressure (value pressure is determined empirically) feed the cutting fluid (coolant) in a known manner. This fluid provides lubrication and cooling of the part 3 during processing of its ends and reduces wear on the inner surface of the sleeve 4 in the area of its contact with the part 3. When the loading disc-separator 2 rotates, it carries along the cylindrical parts 3, which with simultaneous translational and rotational motion are machined with grinding wheels 1.

Such design conditions for the supply of cutting fluid to the interaction zone of the part and the sleeve positively affect the quality and accuracy of the machined end surfaces of the parts by creating favorable conditions for the necessary rotation of the part and reducing wear on the base cylindrical surface of the sleeve.

Unlike analogues, the proposed device provides improved accuracy of machining of the ends of the parts and reduced costs for replacing the installation elements (bushings) of the loading disc-separator by reducing wear on the base cylindrical surfaces of the bushings. Reducing wear is achieved by optimizing the characteristics of the friction pair with a reliable separation of the friction surfaces in the area of their loading with a layer of cutting fluid.

Claims (2)

1. A device for double-sided grinding of the ends of the parts, containing two opposed grinding wheels and a rotating loading disc-separator with a device for installing workpieces in the form of bushings located circumferentially on the periphery of the disk, characterized in that each sleeve has a lubricating pocket located on the inner surface of the sleeve in the area of maximum load acting on the surface of the sleeve from the grinding wheels in the process of simultaneous grinding of two oppositely disposed end faces in the hub parts to supply the grease pocket pressurized coolant. 2. The device according to claim 1, characterized in that the angular position of the lubricating pocket is determined by calculation based on the geometric parameters of the machine setup.