SU806205A1 - Method and apparatus for manufacturing sleeves from sheet materials - Google Patents

Description

(54) METHOD OF MANUFACTURING SLEEVES FROM SHEET MATERIAL AND DEVICE FOR ITS IMPLEMENTATION

displaced with sleeve reamer; in fig. 7 is a section bb of FIG. one; in fig. 8 - scan the surface of the punch; in fig. 9 - combining sweeps.

An example of the method. .

A tape of metal fluoroplasty is fed to the processing zone, pressed against the working surface of the matrix and bent according to the shape of the working surface of the matrix. After bending the tape, the workpiece is cut, starting from the ends forming the butt of the sleeve, and at the same time the workpiece is bent, the shape of the sleeve, and the sleeve is bent in the direction opposite to the bend of the tape before cutting. The cutting of the workpiece and bending it into the finished cone sleeve is done in one working stroke.

A device for carrying out the method comprises a matrix 1, a punch 2 and a clamp 3. The working surface 4 of the matrix 1 has a working hole 5, the entrance edges of which are formed by arcs b and. 7, the ends of which are connected straight. Arcs 6 and 7 are associated with the sweep arcs of the finished sleeve by dependency.

(one)

R cos ft

R

one

where R is the radius of the arc of the input edge

holes;

R

- the radius of the arc sweep sleeve;

- the angle of the slope of the sleeve. The length of the arcs b and 7 is equal to the length of the corresponding arcs of the sweep sleeve. The working surface 4 of the die is made tapered and the slope of the generatrix is an angle equal to the slope angle of the sleeve to the plane perpendicular to the longitudinal axis of the punch (axis of the working hole of the die). The working hole 5 of the matrix is made expanding downwards due to the inclination of the wall of the matrix 8, which corresponds to the arc 7. The angle of inclination of the machines 8 to the longitudinal axis of the punch is equal to the angle of inclination of the sleeve. The distance between the arcs 6 and 7 is equal to the length of the forming sleeve. The punch in cross section is made along arcs 9 and 10, the radii of which are equal to the radius of the arc of the input edges of the matrix R and R, but the distance between them is equal to the height of the finished sleeve. The ends of the arcs 9 and 10 are connected, as in the matrix, by straight lines. The difference between the arcs 6.7 and 9.10 (see Fig. 5) from the arcs of the sweep of the sleeve 11 and 12 is explained by the concavity of the working surface 4 of the matrix, the shape of which also takes the sheet, from which the sleeve blank is cut. Cutting edges 13-16 are located on the side surfaces of the punch, between which is enclosed a working surface 17 with symmetrically arranged inclined shaping surfaces, which bend the workpiece. Edges 13 and 14 are inclined and

match on radii r and r, respectively. The radii r and hd of the circles are circles that lie at the bases of the cone, the longitudinal axis of which is perpendicular to the longitudinal axis of the punch, and the cone forming this cone is inclined to the plane perpendicular to the longitudinal axis of the punch at an angle equal to the angle of the bushing. Due to such an implementation, each forming working surface of the matrix is parallel to the opposite forming punch.

The angles of inclination of the cutting edges 13 and 14 of the punch to a plane perpendicular to its longitudinal axis are determined from the expression

(2)

cos oi

where .0 is the inclination angle of the cutting edges; g - the desired radius of curvature

bushings;

h is the height of the glossy arising in the cutting zone. The angles of inclination of the cutting edges are determined empirically.

For a tapered bushing with parameters; Inner diameter less 8

This base D.

mm

Internal diameter of the greater 18 1 of the base D, mm Wall thickness t, mm Angle of inclination,

15 18.6

The height of the sleeve H, mm. Get the following dimensions of the workpiece and the tool, mm: The length of the generatrix L

19.2 Major arc radius 36.7 sweep R Radius smaller 17.5

sweep arcs R

The length of the greater arc

sweep 6 59.7

Shorter arc length

sweep 28.3

The height of the glossy arising in the cutting zone (determined experimentally) is h0., 9 t.

The radii of the arcs of the hole of the matrix and the surfaces of the points are equal, mm:

The radius of the larger arc is .35.5

Radius smaller

arc 9

The angles of inclination of the cutting edges are: for the edges located on the surface of the punch formed by the larger arc d 25 ° 50; for edges located on the surface of the punch formed by a smaller arc X,. 34 55; edge matching radius 0 14 - g 10 mm; edge contact radius 13–5 mm.

According to the obtained dimensions, a die and a punch are made.

Claims (3)

The matrix is made from a billet with a diameter of 100 mm. A billet is faced and, at one of the ends, the working opening is marked out relative to the center - two arcs with radii R 35.5 mm, R 16.9 mm are drawn. They lay on the arcs of their lengths-, 59.7 ml and 6–28.3 mm, the ends of the arcs are joined. The working opening of the matrix is made by marking. Then, at the end of the matrix preform, a cone with an angle of inclination is formed, which forms (90 -f5) to the matrix axis, i.e. 75. The wall of the hole, corresponding to a section of a large arc, is made at an angle of 15 ° to the axis of the hole. The punch is made of a tubular billet with a diameter of 100 mm on the marking, or on a flock with a programmed control of a cylindrical cutter with a radius equal to the outer radius of the sleeve moved according to the law Y (3) where K is the angular coefficient representing the tangent calculated by the formula (2) angle of inclination of the cutting edge of the punch. The working surface of the clamp is made equidistantly the working surface of the matrix. The use of the proposed method of manufacturing the sleeves and the device for its implementation reduces the labor intensity by a factor of 3-5 with good quality. Claims 1. A method of manufacturing sleeves from a sheet material, by cutting out a billet and simultaneously bending it, characterized in that. In order to obtain tapered sleeves, before cutting, the sheet material at the site of subsequent cutting is bent in the direction opposite to the direction of bending of the workpiece during cutting. 2. A device for carrying out the method according to claim 1, made in the form of a combined action punch, comprising a matrix with a working hole and a punch, whose working end is made with symmetrically arranged inclined shaping surfaces and has cutting edges on it, characterized in that the ends of the punch and die have a conical shape, forming surfaces bounding the working Toptibi of the punch and die are inclined to the longitudinal axis of the punch at an angle of 90 - 1, where P is the angle of inclination of the sleeve and the working hole is m the matrix is bounded by arcs with radii associated with the radii of the sweep sleeve dependence R R cos b - where R - radius of inlet openings arc edge; R is the radius of the arc sweep sleeve; fi is the slope angle. bushings. 3. A device according to claim 2, characterized in that the wall of the die in the larger arc section is inclined to the longitudinal axis of the punch at an angle greater than the angle of inclination of the sleeve. Sources of information taken into account in the examination 1. Meshcheram V.T. Sheet stamping. Ltlas schemes. M., Mechanical Engineering, 1951; sheet. 56-, FIG. 293. Fmg if FIG. 2 . / t- / j Phi1.5