RU64136U1 - ROTARY AUTOMATIC - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular for stamping rod products. The rotary automatic machine contains a stamping rotor, around the circumference of the drums of which are matrices and punches with devices for pushing and removing piece blanks. The interaction of the devices with the workpiece is through ejectors. The feed rotor with grippers is installed so that the workpiece is fed into the matrix from the side opposite to its working end — the end surface in contact with the punch during stamping. The matrix contains working and receiving holes, which are made from the side of its inoperative end. When the drums with the dies and punches rotate, the feed rotor rotates synchronously. When reciprocating, stamping of the thickening of the products and the return of the punches to their original position occurs. The product is removed from the matrix by an ejector, which then returns to its original position. The claimed technical solution is aimed at improving the quality of products and the durability of the stamping blocks by simplifying the design and increasing the reliability. The result of the proposed solution is the high productivity of the process due to the combination of stamping processes with the piece of products from the wire.

Description

The utility model relates to the processing of metals by pressure, in particular for stamping rod parts.

Known cold heading machines designed for the landing of fasteners (Cold die forging. Handbook, red. G. Navrotsky, M., Engineering). Automatic machines contain cutting and upsetting dies, punches, a mechanism for cutting and transporting workpieces. The wire is fed through the cutting matrix to the stop. The piece blank is cut with a knife and transferred to stamping in the landing matrix. The recommended working gap between the upsetting matrix and the workpiece is 0.01 ... 0.02 mm. In the process, there is a mismatch of the nodes that control the positioning of the workpiece relative to the working hole of the upsetting matrix, the cutting edge of the knife becomes dull, leading to distortion of the shape and the occurrence of burrs in the place of the segments. As a result of this, during the transfer of the workpiece to the upsetting matrix, chips, tears and tears are formed on its core, worsening the quality of the products and tool life

Also known is a rotary machine, copyright certificate No. 1255392, 23 Q 39/24, containing a working rotor with tools evenly spaced around the circumference of its drums, including devices for pushing and removing workpieces, and a rotor for feeding workpieces with grippers. The workpiece is fed into the working space formed by the upper and lower tools. In this case, the positioning accuracy is determined by the dependence:

Where:

s is the minimum working clearance;

n is the number of working positions in one technological rotor.

With a minimum working clearance of 0.01 mm. and 6 working positions in one rotor, the positioning accuracy is high and is:

Under production conditions, achieving K = 0.002 mm. Is unrealistic.

As a result of this, there is a misalignment of the workpiece relative to the working diameter of the matrix, leading, when transferring the workpiece to the matrix, to the occurrence of chips,

scoring and tearing on the rod. At the same time, the quality of the products and the tool life deteriorate.

Known nailing machine (Cold forging. Handbook, red. G. Navrotsky, M., Mechanical Engineering, p.312, Fig. 35) in which the wire is fed through the upsetting matrix and in which the receiving hole is made coaxially with the working, diameter large by the value of the positioning error. The receiving hole in it serves to position the piece blanks.

There is a rotary automatic machine (V. Preuss, “Technological rotary machines yesterday, today, tomorrow”, M. Mashinostroenie, 1986. p.19-21, Fig. 11 ... 13) which contains a stamping rotor with tool blocks, in which are mounted matrixes, punches with devices for pushing the workpieces and pushing the stamped parts, and rotors with grippers for feeding piece blanks into the stamping space between the punches and dies.

The claimed technical solution is aimed at improving the quality of products and the durability of stamping blocks by simplifying the design and increasing the reliability due to lower requirements for the accuracy of positioning of workpieces.

To solve this problem, it was proposed to install the feed rotor from the side opposite to the working end of the matrix, and in the matrix, coaxial to its working diameter, make a receiving hole with a diameter of a large positioning error of the gripping devices of the feed rotor. From the non-working end of the matrix, it is proposed to perform a conical lead-in section. A conical surface also exists between the receiving opening and the worker.

The result of the proposed solution is the high productivity of the process due to the combination of stamping processes with the piece of products from the wire. The receiving hole is made in order to conveniently enter the end of the wire into the machine, which reduces the complexity of its commissioning.

The rotary machine includes a stamping rotor, around the circumference of the drums 1 and 2 of which are the matrix 3 and punches 4 with devices 5 for pushing and removing piece blanks. The interaction of the devices 5 with the workpiece is carried out through the ejectors 6. The feed rotor 7 with the grippers is installed so as to ensure that the workpiece is fed into the matrix 3 from the side opposite to its working end - the end surface in contact with the punch during stamping.

Matrix 3 contains a working hole d _p and a receiving hole d _n , which is made from the side of its inoperative end. The diameter of the receiving hole d _n ≥d _p + K, K is the error in positioning the workpiece.

Where

s is the minimum working clearance;

n is the number of working positions of the stamping rotor.

When the drums 1 and 2 are rotated with the matrices 3 and punches 4, the feed rotor 7 also rotates synchronously.

The workpiece is supplied piecewise from the side of the inoperative end of the matrix 3 coaxially with the receiving hole d _n . The diameter d _{p is} made in magnitude so as to take into account the actual positioning error K of the gripping devices of the feed rotor 7. With the device 5, which interacts with the drive (not shown), using the ejector 6, the workpiece enters the receiving hole d _n , then into the working hole d _{p of the} matrix 3, where it is fixed for stamping. When the reciprocating movement occurs stamping thickening of the products and the return of the punches 4 to its original position. The product is removed from the matrix 3 by the ejector 6, which then returns to its original position. The work cycle is repeated.

As a result of the execution of the machine, it was possible to feed the workpiece from the side of the non-working end and to make a receiving hole in the matrix, the presence of which allows to simplify the design, reduce accuracy and improve the reliability of the rotor supply of piece blanks and the quality of stamped products by eliminating chips, scoring and tearing on the rod. The diameter of the receiving hole is made so as to create the necessary gap, taking into account the actual positioning error, when transferring the workpiece to the matrix without damaging the core. This provides improved quality stamped products and tool life.

Claims (1)

A rotary automatic machine comprising a stamping rotor with tool blocks in which dies are mounted, punches with devices for pushing and removing products, a feed rotor for piece blanks with grippers, characterized in that the feed rotor is installed on the side opposite to the working end of the matrix, and in the matrix, coaxial to its working diameter, a receiving hole with a diameter greater than the positioning error of the gripping devices of the feed rotor is made, and a conical inlet current.