SU1431919A1 - Arrangement for supplying lubricant-coolant to the grinding zone - Google Patents

Abstract

The invention relates to metal working, namely, to devices for supplying coolant to the internal grinding zone. The aim of the invention is to increase the cooling efficiency by increasing the rate of coolant supply to the internal grinding zone. Coolant through the holes 2 in the mandrel 1 is fed into the groove 4 and from there into the radial holes 6 of the ring 5. Through these holes the coolant enters the grinding zone and under the casing 8, the inner surface of which is made in the form of a second-order curve. The casing 8 is installed so that the gap between the inner surface 10 of the casing 8 and the outer surface of the ring 5 is changed according to the law b 0; - r .55 °; 5 factor ,. characterizing the curvature of the surface, 9 is the floor angle, g is the outer radius of the ring 5. Since the gap decreases in the direction of rotation of the mandrel 1, coolant is fed to the cutting zone at high speeds. f-ly, 2 ill. "(L

Description

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WITH

with so

: The invention relates to metal-working, in particular, to devices for supplying cooling lubricant and its fluid (coolant fluid) to the zone of internal hygiene.

The purpose of the invention is to increase the cooling efficiency by increasing the rate of coolant supply to the internal grinding zone.

FIG. shows a diagram of the device, side view; figure 2 - section aa. On figure 1.

The device contains a mandrel. 1 with a cavity in the form of a longitudinal axial hole 2, radial holes 3 and a groove 4, the radial holes 3 connecting the hole 2 and the groove 4o. The device also contains a ring 5 mounted on a mandrel 1 with radial channels 6 connected to the groove 4, grinding circles 7 and housings 8 With a window 9, covering ring 5 and a circle 7 with a gap. The inner surface 10 of the casing 8 is filled in the form of a cylinder with a second order along the curve, and the casing 8 is installed so that the radial gap between the inner the surface of the casing and the outer surface the ring is changed according to the law

  B .0; - g where b - coefficient characterizing

curvature of the surface, b - the floor is the angle; g is the outer radius of the ring. In this case, the Archimedes spiral is selected as the order curve, and the spiral center is offset from the center of the ring by an e value determined from the expression

e (S flo. +0.7 g) cos e.

and - (b

The device works as follows.

During internal grinding, the mandrel 1 is connected with grinding wheels 7 and a ring 5 fixed on it. Coolant is fed through the axial hole 2 of the mandrel 1 and groove 4. From there, under the action of centrifugal force, coolant is thrown into the radial holes 6 of the ring 5 from the wear material and from there into the grinding zone and into the space between the grinding wheels 7 and the skin xom 8 with the inner surface in the second-order curve, described by the Archimedes helix equation,

necessary to gradually increase the speed of the fluid. The coolant flowing into this space is entrained by the grinding wheel 7 through the window 9 into the wedge-shaped gap between the grinding wheel 7 and the surface of the hole being machined in the product 11. In this case, a much larger amount of coolant enters the grinding zone (through the radial holes 6 in the rings 5 and through the window in the housing 8), and the coolant to a greater extent has a lubricating effect. The uneven gap between the grinding wheel 7 and the casing 8, resulting from the fact that the inner surface of the window 9 is made in a second-order curve, allows you to catch coolant coming out of the grinding zone, as well as smoothly increase the speed of the coolant as it approaches the zone grinding. Due to this, the cutting forces and the temperature in the grinding zone are sharply reduced, which allows to increase the processing mode, the productivity of the grinding process, as well as improve the quality of the machined surface.

In the proposed device, through the grinding zone, more co-jQi4ecTBO coolant per unit of time passes, which means more heat is carried away with the liquid. Due to this, the temperature in the grinding zone and in the surface layer of the workpiece decreases and, as a result, the risk of surface defects (burns, microcracks, etc.) is reduced, and therefore the quality of the treated surface increases.

Claims (1)

1. A device for supplying coolant to the grinding zone, comprising a hollow mandrel, a ring with radial channels attached to the mandrel connected to the mandrel cavity, and a casing with a gap surrounding the ring, with a window facing the cutting zone, in order to increase the efficiency of cooling by increasing the rate of coolant supply to the internal grinding zone, the inner surface of the casing is made in the form of a cylindrical surface with a second-order curvature. and the casing of the mouth; 1 updated so that the radial clearance marks the inner surface of the casing and the outer surface of the ring varies according to the law S. , S-ъ.д, -.  g rTS 0 225: where b is the coefficient characterizing the piggy surface curvature; 9 - polar angle / g - outer radius of the ring. 2, ycTpofjcTHo according to claim 1, about t l and tea 1D e e s tm what's in k; h with h-1- In the second-order curve, the Archimedes spiral is chosen, and the center of the spiral is shifted relative to the center of the ring by e, determined from the expression e (b.-) COS0