SU1655650A1 - Method of nuts making - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the processes of forming nuts. The purpose of the invention is to improve the quality of the nuts, the durability of the dies and the performance of the rotary stamping lines. The original billet is cut off from a calibrated rod or wire with a diameter of 0.9-0.92 of the diameter of the inscribed circumference of the hexagon of the finished nut. The ends of the billet are calibrated with sediment and a stamp containing round semi-matrices and coaxial spring-loaded punches is transmitted, by means of which the billet is fixed in the stamp. The billet is brought together by converging semi-matrixes with the formation of chamfers at the ends of the billet. The metal first flows primarily in the face zones to the periphery, and then its flow is limited by the inner cylindrical surface of the semi-matrix. At the final stage of precipitation, the central punches displace the metal from the axis to the periphery in the middle zone of the billet. The resulting barrel-shaped semi-finished product is stamped to form a hexahedron with the extrusion of the central cavities. Then punch a hole under the thread of the nut. 2 Il. J

Description

The invention relates to the processing of metals by pressure and can be used in die forging processes of hexagon nuts from round gauge wire or rod.

The purpose of the invention is to improve the quality of the nuts by eliminating cracks and under-shaping the corners, increasing the durability of the dies due to a decrease in the punching pressures and an increase in productivity when using rotary punching lines.

FIG. Figure 1 shows the shape change of the billet nut on the stamping transitions (I is a severed billet; II is after preliminary calibration with draft; III is a barrel-shaped semi-finished product after precipitation in

round half-cucumber; U - hexagonal semi-finished product after stamping with extruding grooves; Y - after punching a hole under the thread), Fig. 2 - the process of precipitation in converging semi-matrices with central punches during the formation of a barrel-shaped semi-finished product according to stages

The method is carried out as follows.

From the calibrated rod or wire with a diameter of 0.9-0.92 inscribed diameter of the finished hex nut, the cutting of the workpiece is performed (Fig. 1). then, in operation li, pre-calibration of the cut billet is carried out by precipitation to form a small

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chamfers on the bottom and conical grooves on the ends on both sides. In operation III, the workpiece is gripped by the gripping body of the transport rotor on the axis of movement of the deforming tool. In this case, the protruding spring-loaded punches 1 and 2, when moving towards each other, clamp the workpiece, the entrance with conical ends into the conical recesses of the workpiece. At this point, the gripping organ leaves (Fig. 2a). With the further approach of the round semi-matrix 3 and 4, the punches 1 and 2 are sunk (the punches are spring-loaded) and the workpiece comes into contact with the semi-matrix (Fig. 26). Continuing the movement towards each other, the semi-matrix deforms the metal of the workpiece, which flows in the area of the ends of the workpiece in the radial direction. The metal flow is limited by the inner cylindrical surface of the semi-matrices, then as the semi-matrices approach, the radial flow of the metal moves from the proprietary zones of the workpiece to its middle, and in the final stage (Fig. 2c) the punches 1 and 2 come into operation, displacing the metal in the middle zone of the workpiece from its axis to the periphery (Fig. 2d). As a result, a draft of the workpiece is closed with a relatively uniform filling of the cavity of the detachable die and a round barrel-shaped semifinished product with clearly shaped chamfers at the ends is formed.

In operation (U, hexagons with two external chamfers are formed and extruded deep coaxial cylindrical cavities with chamfers on both sides. In operation U, a hole is punched for a thread. The transfer of products from one operation to another in the rotor line is carried out by gripping bodies of transport rotors (not shown) with great reliability, since the form of the semifinished product in all operations, except the last one, is round .In the last gear of the hexagonal semi-finished product for the operation of punching the hole, application presents no difficulties, since the position of the faces of the hexagon immaterial, since the preform is placed on the upper plane of the matrix breakdown.

The advantage of the proposed method in comparison with the known is determined

topics that the dimensions of the original (cut off) billet with a diameter of 0.9-0.92 diameter of the inscribed circumference of the hexagon of the finished nut (ie, 0.9-0.92 size of the key)

close to the size of the finished nut, which ensures small degrees of deformation due to precipitation and punching transitions, and this, in turn, determines the absence of cracks, good clearance of corners and increased

durability of stamps. With such billet sizes, the operation of forming a barrel-shaped semi-finished product (with large chamfers) can be carried out only in converging semi-matrices. The regulated flow of metal in stages of precipitation with the impact of punches in the final stage ensures the favorable character of the memory of the punch, which additionally determines the high quality of the manufactured nuts. Due to the absence of tool breakage, the performance of the rotary stamping line is improved.

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Claims (1)

Invention Formula A method of manufacturing nuts, which includes cutting the billet, pre-calibrating the ends of the billet with sediment to form a chamfer on one of the ends, forming a barrel-shaped semi-finished product by precipitating to form external chamfers on both sides of the billet, stamping the hexagon on the side surface of the billet with simultaneous bilateral extrusion of the central cavities and punching the hole nuts for thread, o t - in order. that, in order to improve the quality of the nuts, the durability of the dies and the performance when using the rotor stamping line, the billet is chopped off with a diameter of 0.9-0.92 of the diameter of the inscribed hex of the finished nut, and the draft of the billet, when forming a barrel-shaped semi-finished product, is performed by converging semi-matrices, and stages of precipitation limit the flow of metal to the periphery in the near-face zones of the semifinished product by round walls of semi-matrix and displace the metal from the axis to the periphery by central punches in the middle zone of the semifinished product.