SU931438A1 - Straightening shaped tool - Google Patents

Description

(5) GOVERNING FITTING TOOL

I

The invention relates to a machine tool industry and concerns straightening shaped grinding wheels with diamond shaped tools.

The known design of the right shaped tool, made in the form of a roller, includes a body, on the working surface of which diamond grains of the same size 1 are fixed in one layer.

A disadvantage of a tool of known design is the uneven wear of diamond grains in different zones on the working surface of the roller. At the same time, the greater the angle between the normal to the profile and the axis of the roller, the less wear is in this area of the tool profile. The areas with an angle of 90 are subjected to the least wear. The uneven wear of diamond grains leads, in addition, to a distortion of the profile of the roller and a decrease in the accuracy of editing.

The purpose of the invention is to increase the efficiency. the efficiency of using diamond grains due to their more complete use in the shaped right tool.

To achieve this goal, in the right shaped tool, which includes a housing, on the working surface of which diamond grains of the same size are fixed in one layer, the strength of the latter is proportional to the angle formed by the plane, perpendicular to the tool axis, and normal to the working profile of the instrument and determined from the ratio

3. () CREAM .- “- K,

where 3 the strength of diamond grains

on the profile section of the shaped tool with an angle. H Q °;

Claims (1)

K is a coefficient characterizing the degree of adhesion interaction between the diamond grain and the bond; 4i, the angle between the perpendicular to the tool axis and the normal to the working profile of the tool in the area of the diamond I 3j is the strength of the diamond grains 8 to the desired area of the working tool profile. The drawing shows the proposed design of the right tool and the refill abrasive wheel. Shaped grinding wheel 1 interacts with the right roller 2, on the case of which, using bonding 3, oriented diamond grains are fixed in one layer, the strength ratio of which is proportional to the angles H, f, 2, Chu ... between the plane, perpendicular to the tool axis and the normal to the working profile of the right tool at the given point where the diamond is located. At the same time, the strength of the I diamond grains located on the tool profile is in the following ratio: | | (1-K) K, where I is the strength of diamond grains on the section of the profile tool with an angle of 0 °, is determined by the technical requirements for dressing and depends on the grade of diamond grain, its durability (200) ,; 3, - strength of diamond grains in the desired area of the working profile of the tool, K - coefficient characterizing the degree of adhesive action between the grain and; connection, it is determined experimentally (0,) -, If. - the angle between the perpendicular axis of the tool and the normal, (pn) to the profile of the tool in the area of the diamond grain. In operation, the diamond casting rollers of the known construction wear unevenly. In the first place and more heavily wear out diamond grains located in the pro-fil sections with an angle between the normal to the profile and the plane perpendicular to the axis of the tool, equal to O. This circumstance is explained, apparently, by the fact that In this case, the wear rate of the diamond grain is determined by the normal component of the cutting force arising from the dressing. Taking into account this circumstance, it is necessary to determine the wear resistance and the diamond grade for a given point of the ruler tool profile, which depend on the strength of the diamond grain. During operation, as a result of the tool wear, the contact area between the individual grain and the bond decreases, due to which The stresses arising in the grain increase, which can lead to diamond crushing if these stresses exceed the strength of the diamond grain. A decrease in the contact area also causes a decrease in the bonding forces of the diamond grain in the bond, and if the contact area is less than the permissible value, the grain is pulled out of the bond. The specified minimum allowable size of the contact pad is characterized by the coefficient of adhesive interaction between the grain and the bond. During operation, it is necessary that the strength of diamonds in all areas of the tool profile ensures the simultaneous occurrence of the maximum allowable wear and stress in the diamond grain in the section with H close to o, did not exceed the allowable. Thus, the coefficient of adhesive interaction in this case is an indicator that characterizes the minimum, the permissible strength a the diamond grain located in the tool, which is determined by the maximum allowable stresses in the diamond grain, associated with the minimum allowable contact pad. Setting the diamond profile with optimal strength to a given point ensures uniform wear of all diamond grains located on the working profile of the tool. helps to improve the accuracy of editing, while the durability of the right tool remains unchanged, a positive effect is also achieved It is to the same and cheaper. 59 Apply p. A diamond right-handed roller with an internal radius profile has a grain size of 500 µm diamond grain, a coefficient of K 0.8) 3,200. In this case, the cost of the diamond grain in the right-hand diamond roller decreases by, while the durability of the right-hand tool does not change. The proposed design of the right shaped tool allows to increase the efficiency of using diamond grains, improve the accuracy of editing and reduce the cost of the tool due to the use of cheaper diamond grains. Claim 1. A shaped shaped tool comprising a body, on a working surface of which, uniform diamond grains are fixed in a single layer, characterized in that, in order to increase the efficiency of using diamonds, the strength of diamond grains on the working surface is proportional to the angle formed by the plane , perpendicular to the axis of the tool, and normal to the working profile of the tool in the area of the diamond grain. h ald og pr 5 5. P ro The table shows the data characterizing the strength ratio of diamond grains located in different parts of the working tool profile. . The tool of claim 1, distinguished by the fact that the strength of common grains is determined from the relation: 3.p (1-K), 3 is the strength of diamond grains in the section of the profile tool with an angle of {f 3; - strength of diamond grains in the desired area of the working profile of the right shaped tool; K, coefficient characterizing the degree of adhesive interaction between the grain and the bond; HH is the angle between the plane perpendicular to the axis of the tool and the normal to the working profile of the tool in the area of the diamond. . Sources of information that are considered in the examination. Quick Reference Metalist. ed. A.N. Malova, M., Ourmost. 1972, p. 653-655.