Chetyrehballnoe forging device
The invention relates to the processing of metals by pressure and can be used in the forging of ingots and billets on hydraulic forging presses and radial crimp machines. The holders of the upper and lower heads of the kinematically connected with the side holders Boykov. The device is equipped with four strikers, established in the respective holders. The lower die is placed on Polushka, which by means of four rocker-crank mechanisms connected to the holder top striker. The mentioned mechanisms are symmetrical, two on each side of the device. The rods of these mechanisms is connected with poloskei, and rocker - holder top striker. Pivot bearing of the rocker arm fixed to the lower holder striker. Polushka installed in the guide holder bottom firing pin with the possibility of vertical movement by an amount equal to the displacement of the upper firing pin. The result is improved quality forging by maintaining the axis of the forging at a constant height throughout the forging process. 3 Il.
The invention relates to the field of metal forming, namely chetyrehochkovym forging in the socio - crimp machines.
It can be used in machine-building and metallurgical industry for the production of products with a long axis, for example, rods, columns, intermediate shafts, torsion bars, mill rolls, the axes of railway cars and similar products, as well as in the production of forged blanks for further processing pressure, for example forging structural, stainless, heat-resistant and hard steels and alloys.
Known chetyrehballnoe forging device used in chetyrehvalkovoj radial crimping machine (Century A. Tyurin, V. A. Lizorkin, I. A. Pospelov and other Forging on radial crimp machines. - M.: Mashinostroenie, 1990, S. 13) consisting of a body inside which there are four rocker-crank mechanism, interconnected gears and four firing pin attached to the sliders.
The disadvantages are considering forging device are: the design complexity, low reliability of its work, the impossibility of carrying out large unit reductions and the use of this design in forging hydraulic forging press.
It is also known chetyrehballnoe a forging device, consisting of the holders of the rest of Boykov, installed in the holders known (see Japanese patent application No. 58 - 12088, CL 21 J 9/06, 9/02, 13/02, publ. 83.03.07).
A disadvantage of the known chetyrehvalkovoj forging device is that its design does not provide simultaneous convergence of all four strikers in the process. The lower firing pin remains stationary during operation of the device. Thus the longitudinal axis of the forging constantly changes its position in height, depending on the size of the cross-section forgings, which is not always allowed by the process technology. In addition, forging in such a device can lead to curvature of the forgings and the need for its further edits, and in the forging step of forging the possibility of displacement of the axes of the plots forgings having different diameters.
The basis of the present invention is tasked by changes in the structure of the device, maintaining the axis of the forging process forging at a constant height.
This object is achieved in that in chetyrehsetovom forging device, consisting of the holders of the upper and lower forging dies, kinematically connected with them two brackets side Boykov and four heads installed in the holders Boykov, what's new is that the holder top striker on each side of the device, rocker-crank mechanisms, the connecting rods are connected with poloskei, and the rocker arm, a pivot bearing which is fixed to the lower holder striker connected with the holder top striker, with Polushka installed in the guide holder bottom striker can be moved vertically by an amount equal to the displacement of the upper firing pin.
Patented chetyrehballnoe forging device illustrated by diagrams (Fig.1-3).
In Fig.1 presents chetyrehballnoe a forging device in the statistical condition, front view; Fig.2 is a top view of chetyrehvalkovoj forging device of Fig.3 is a front view of chetyrehvalkovoj forging device in the process of compression of the workpiece.
Chetyrehballnoe forging device consists of a holder top striker 1, the holder bottom striker 2, the brackets of the side of the heads 3, 4, Boykov 5-8, poloski 9, the guides 10, four rocker-crank mechanisms 11 to 14 (Fig.1-2). Rocker-crank mechanisms, in turn, consist of rods 15, raisers using 16, the hinge supports 17, hinges 18-21 (Fig.1). Holders Boscovich Boykov connected with the holders of the upper and lower forging dies using the links 22 (Fig.1).
Work chetyrehvalkovoj forging device is sleater lower firing pin 2 is fixed on the tool table press, for example, by connecting a dovetail, and the upper holder 1 striker - plate connected with the upper (movable) traverse the press.
When raising the movable beam press up moves up and top die 5, and also by means of links 22 divorced in hand holders Boykov 3, 4 together with the side strikers 6, 8. Simultaneously with the rocker-crank mechanisms 11 to 14 is lowered down Polushka 9 together with the bottom brisk 7, opening the workspace of the device (Fig.1). Then the workpiece manipulator served in the active area of the device. After that include the working stroke of the press, in which its movable yoke moves the upper holder 1 striker with the striker 5 in the direction of the workpiece 23, and through the rocker-crank mechanisms 11 to 14, moves pultusku 9 with the lower brisk 7 upwards, compressing the workpiece in the vertical plane (Fig.1-3).
At the same time the holder top striker 1 is moved toward the workpiece 23 holders 3,4 lateral heads of 6.8, which compresses it in the transverse plane. The rocker arm 16 mounted on the hinge supports 17 fixed on the one hand with the cardholder top striker, and on the other hand - with rods 15, provide for the same account the t of the curvature of forgings at its compression (Fig.1). Are the rocker-crank mechanisms, as follows. When the movement of the upper holder 1 striker up, pull, hinge connected to the upper holder striker 1 and the rocker arm 16, will rotate the latter around the axis of the pivot bearing 17 and pulled down the rods 15, simultaneously moving down pultusku 9 with the lower brisk 7 (Fig.1). When the movement of the upper holder 1 striker down thrust, pivotally connected to the rocker arm 16, the push rod 15, and with them, a hinge mounted on the rods pultusku 9 with the lower brisk 7, up through the vertical compression of the workpiece 23. The guides 10, which is installed Polushka 9, provide a strictly vertical movement of the lower firing pin 7. The same reciprocal movement of the upper and lower Boykov provide constant height position of the longitudinal axis of the workpiece. Due to the fact that counter move Boscovich Boiko chetyrehsetovom forging device, the proposed design also equal, the position of the longitudinal axis of the workpiece remains constant in all planes. Use in a forging device, four symmetrically arranged, two on each side of the device, rocker-crank mechanisms provide movement poloski without distortions in napravlyaushaya can be used in any process, where are usually the same compression of the workpiece with four sides and are not allowed considerable curvature along its longitudinal axis.
Patented chetyrehballnoe forging device can also be used in radial crimp machines with mechanical, hydraulic or hydro-mechanical drive types. The actuator radially crimping machines connect with the holder top striker and holder bottom firing pin is fixed rigidly in the body of the forging unit.
The claimed design chetyrehvalkovoj forging device provides simultaneous simultaneous convergence of all four strikers that can significantly reduce the curvature forgings and throughout the forging process to maintain a constant height position of the longitudinal axis of the forging.
Chetyrehballnoe forging device containing the upper and lower holders Boykov, kinematically associated with two holder side Boykov and four firing pin mounted in the holders Boykov, characterized in that the holder top striker connected with poloskei, on which a lower die, with four symmetrically located two on each side ostereich fixed to the lower holder striker connected with the holder top striker, with Polushka installed in the guide holder bottom striker can be moved vertically by an amount equal to the displacement of the upper firing pin.
FIELD: metal working.
SUBSTANCE: hard alloy matrix has casing, bushing pressed in the case and hard alloy insertion. Bushing has multifaced hole. Hard alloy insertion is composed by several sections made in form of trapezoidal-section prisms which have cut angles at their non-working edges. Number of sections corresponds to number of faces of item to be headed. Cuts of angles are made symmetrically to faces of working edge. Slits are made in several places of multifaced hole bushing at the ponts where faces cross each other.
EFFECT: improved resistance of matrix; simplified assembly.
3 cl, 1 dwg