RU50447U1 - ROTARY HOOD DEVICE - Google Patents

Abstract

The proposed utility model relates to the processing of metals by pressure, to the process of rotational drawing of parts from hard-to-deform steels and alloys in the form of a truncated cone, animated shape. The effectiveness of the device is to ensure accurate fixation of the workpiece, preventing lateral displacement during rotational drawing. A device for rotary drawing consists of a frame, on the end of which there are grooves, the number, width, depth of which are calculated values and depends on the material being processed, the shape of the part. In cross section, the groove has the shape of a segment, the maximum depth of which is at the end of the frame. The length of each groove does not exceed the size of the technological allowance for the part. The rolling rollers move along a forming frame mounted for rotation. 2 p. Fs, 3 ill.

Description

The proposed utility model relates to the processing of metals by pressure, to the process of rotational drawing of parts from hard-to-deform steels and alloys in the form of a truncated cone, animated shape, etc.

A known method of fixing the workpiece on the mandrel from lateral displacement, which is carried out due to friction between the end of the mandrel and the workpiece pressed to the mandrel with the required force through the tailstock quill (M.A. Gredor, "Pressing and rotational extrusion" M. 1971 . "Engineering" p. 73). The disadvantage of this device is that such a fastening of the workpieces does not provide an accuracy of fixation for parts of hard-deformed alloys with small initial diameters.

A device for rotary drawing is known, having a rotating mandrel in the end of which there is a hole in the center for a pin welded in the center of the workpiece, rollers moving along the forming mandrel. (M.A.Greditor, "Pressing and rotational extrusion" M. "Engineering" 1971 p. 29). The disadvantage of this device is the impossibility of its use for processing parts from difficult to deform materials with a small initial diameter.

The technical task of this development is to ensure accurate fixation of the workpiece from a difficult to deform material from lateral displacement, obtaining parts with a small initial diameter of a high degree of accuracy and quality.

This problem is solved due to the design of the device for rotational hoods, consisting of a frame, at the end of which there are grooves mounted with the possibility of rotation of the rolling rollers moving along the forming frame. The length of each groove does not exceed the size of the technological allowance for the manufactured part, and the number of grooves and their dimensions are

calculated, in addition, the maximum groove depth is located at the end of the frame. In cross section, the groove has the shape of a segment.

The device is shown in section in figure 1; figure 2 is a view a of figure 1; figure 3 is a section of a groove.

The device consists of a frame 1 mounted for rotation, in the end of which set the workpiece 2 in the form of a disk. The roller 3 moves along the generatrix of the rim 1. The rim 1 on the end side along the perimeter has grooves 4 with a maximum depth h on the end side and a length of 1, the length of which is not more than the technological allowance of the manufactured part for further turning. In cross section, each groove has the shape of a segment. The number of grooves and their depth are calculated values and depend on the material, shape and dimensions of the manufactured part.

The device operates as follows.

On the rim 1, a blank 2 in the form of a disk is mounted on the side of the end face, and it is pressed with the help of a tailstock (not shown). Set the rolling roller 3 with a certain clearance relative to the frame 1. Turn on the device, while the frame 1 is rotated, and the roller 3 starts moving along the forming frame 1. When drawing, the metal of the workpiece 2 flows into the grooves 4. Thus, the workpiece 2 is fixed from lateral displacement. After the operation is completed, the manufactured part is easily removed from the frame 1 under the influence of the force in the opposite direction of the rolling roller 4 due to the segmented shape of the grooves and the changing depth of the groove with the maximum depth at the end of the frame 1. After removing the manufactured part, the drawing operation can be started again.

Usage example.

To produce a cone-shaped part made of 12Kh21N5T steel with an initial diameter of 28 mm and an initial angle of inclination of 32 ° by rotational drawing, a frame with grooves 10 mm long, 1.0 mm deep with an exit to the end face, 10 pieces in length was used. The manufacturing process of parts was carried out as follows: a sheet-shaped blank in the form of a disk 2.8 mm thick was mounted on the end of the frame, pressed by a clamp, the frame was turned on, a rolling roller was brought in with an initial roller with a length of 10 mm

a gap of 0.2 mm less than to obtain the thickness of the part, the part began to roll with rolling the metal into the grooves and continued to roll on the rest of the length of the blank forming without turning the frame; after the operation is completed, the part is easily removed from the frame.

Claims (2)

1. A device for rotational drawing, consisting of a frame with fixing elements of the workpiece mounted rotatably, rolling rollers moving along the forming frame, characterized in that there are grooves on the small diameter of the frame, the length of which does not exceed the size of the technological allowance of the manufactured part, number of the grooves, their dimensions are calculated, and the maximum depth of the groove is located at the end of the frame and then decreases towards the large diameter of the frame. 2. The device for rotary drawing according to claim 1, characterized in that in the cross section the groove has the shape of a segment.