SU556934A1 - Method for cam processing cam parts - Google Patents

Description

one

The invention relates more to metalworking and can be used in the manufacture of parts with a curved surface, such as circular cams, on grinding mills and other machines.

There is a known method of copying the cam parts, in which the part and the copier coaxial with it are rotated, as well as the reciprocating movement of the part and the tool with the teflon working surface 11.

The disadvantage of this method is the necessity to have copiers of higher accuracy (by grade 1-2) as compared with the part being manufactured.

The purpose of the invention is to improve the accuracy of machining parts and reduce the complexity of manufacturing copiers.

This is achieved by the fact that according to the proposed method, the direction of reciprocal reciprocating movement of the part and the cutting tool is chosen at an angle to the axis of the cutting tool.

FIG. 1 shows schematically in two projects a device that implements the proposed method; in fig. 2 (a, b) shows the layout of the part and tool in the initial and intermediate positions; in fig. 3 is a schematic diagram of an equivalent implementation of a device for implementing the method; FIG. 4 (a, b) is the layout of the part and tool in the initial and near position.

The proposed method is implemented by means of a device including a rotatable spindle 1 with a cam 2 mounted on it. Workpiece 3: fixed and fixed on rotating mandrel 4, kinematically coupled by coupling 5 with spindle 1.

Cutting tool 6 (grinding 1P) Skkrug or a milling cutter) is fixed in spindle 7 of headstock 8 mounted on a copy support 9 which is mounted on rectilinear guides 10 with the possibility of reciprocating movement. The copy support 9 carries the copying probe 11, which is in contact with the working surface of the copier 2 under the action of the spring 12. The copying probe 11 may be

Claims (1)

 made with a flat, pointed or spherical working surface. The guides 10 of the ttft 9 copying machine are located obliquely to the tfc surface of the cutting tool 6 at an angle 7j, the value of which is determined by calculation, depending on the accuracy of the profile of the part being manufactured. The angle of inclination t is carried out either by turning the headstock or turning the guides (not shown in Fig. 1). When rotating the spindle 1 with an angular velocity W, the copier 2, interacting with the copying probe 11, informs the reciprocating movement S of the copy support 9 with the cutting tool 6 relative to the rotating part 3. As a result of these movements, the end of the cutting tool forms the given profile of the curvilinear surface of the part. In the initial position (Fig. 2, a), the plane of the cutting tool 6 is in contact with the profile of the part 3 at point A, located from the center O of the part at the distance OA, corresponding to the largest (smallest) radius vector RO of the initial circumference of the part profile. In this case, copier 2 interacts with a copy probe 11 at a point B located from the center O of rotation at a distance OV corresponding to the largest (smallest) value of the radius vector g of the profile of the copier (fig. 2a, 5 shows part of the profile of the copier). For simplicity, further calculations assume that the copying probe 11 is axial and has a peaked shape of the working surface. The copy probe is positioned so that the direction of the relative movement of the cutting tool and the part coincides with the direction of the speed of movement of the copy probe (copy support). The intermediate one (the current value of the radius-tector R of the part at point C (Fig. 2, b) is obtained by rotating the declider at an angle Φ-if ± a to the relative movement of the cutting tool and the part by changing the current radius-vector r of the copier. The value of the current radius-vector R the part at point C is changed by the value of AR K. The plane of the cutter and tool 1a relates to the part / w profile at point C and is located at an OD distance from the center O of the part OD K-CosoC. (This position of the plane of the cutting tool corresponds to the current value of the radius vector r copier borrowed with a copy poJDiKOM at the point E g Go D g CQ; T-; hr; CG Ar X; P A1) AO-OB Hd-T - Co 5C C. KoRCosc L THEN dG The resulting formula shows that for a certain curvilinear surface profile there is a decrease angle-y allows you to increase the magnitude of the change in the radius-vector of the copier r several times. For example, Bri-J-O DP 2 (.Co5o1) with f-2 ° 52 D 20 (Kd-RCo & oO) In an appropriate way when machining a curvilinear surface The details of the error in making the copier profile are reduced several times. The proposed method can be implemented with the help of another device (Fig. 3). The copier 2 and the part 3 are fixed on a mandrel 4 rotating in the body of the copy support 9, which is mounted on the guides 10 with the possibility of reciprocating moved}. The copy support 9 under the action of the spring 12 presses the copier 2 to the copying probe 11, which is fixedly mounted. The cutting tool 6 is secured in the stem 7 of the fixed headstock 8. The guides 10 of the copy support 9 are inclined at an angle to the plane of the cutting HHCTpjTvieHTa. In the initial position (Fig. 4, a), the center of the part lies on the normal pn from the surface of the cutting tool at a distance OA corresponding to the smallest (or largest) value of the radius vector RQ. The intermediate value of the radius vector R at point C (FIG. 4, b) is obtained by rotating the part by an angle i ± a and moving the center of the part from point Oo to point O, which corresponds to a change in Dg of the radius vector g of the copier. LG LLC-O B-OB GG-G, Center About the detail is located at the distance OD K CoscC (u AOCD). from, d OdOE. ° 51P K-CoSdL-fl-: 5in jr. The proposed method allows to significantly improve the accuracy of copying and to obtain parts of 1-2 classes of accuracy with the help of a copier made from 3-5 cells. accuracy. The invention The method of copier processing of cam parts, in which the part and the copier coaxial with it are rotated, as well as reciprocating reciprocating movement of the part and tool with an orts working surface, characterized in that, in order to increase the machining accuracy, the direction of reciprocal reciprocating translational motion details. and the cutting tool is chosen at an angle to the axis of the cutting tool. Sources of information taken into account in the examination: 1. Copyright certificate number 86297, 24 В 19/12, 1950. eight / 77777 /////////// УУ / / /about / N g x H. t. Yu U9.1 -jj pulled down