GB2069901A

GB2069901A - Horizontal forging machine

Info

Publication number: GB2069901A
Application number: GB8006610A
Authority: GB
Original assignee: RYAZON Z TYAZHEL KUZNECHNO PRE
Current assignee: RYAZON Z TYAZHEL KUZNECHNO PRE
Priority date: 1980-02-27
Filing date: 1980-02-27
Publication date: 1981-09-03
Also published as: GB2069901B

Abstract

A horizontal forging machine comprises a central slide (12), a side slide (16) and a grip slide (21). A crankshaft (7) of the machine is geared via a crank mechanism to the central slide (12) which mounts a punch (13) and via a cam actuator and the side slide (16) to the grip slide (21) which carries a die (22). The crankshaft (7) is coupled with another crank mechanism having a pitman (14) mounted for reciprocation in the side slide (16). The grip slide (21) effects its working stroke through motion imparted from the crankshaft (7). <IMAGE>

Description

SPECIFICATION Horizontal-forging machine The invention relates to the plastic working of metals, preferably in horizontal-forging machines.

The invention can find effective application in the manufacture of forgings requiring a large gripping force during the forging thereof, for example, for the forging of drilling rod ends.

It is therefore an object of the invention to widen the process potentialities of horizontaiforging machines.

Another object of the present invention is to enhance the reliability of horizontal-forging machines.

And, finally, another object of the present invention is to improve the quality of produced forgings.

This invention provides a horizontal-forging machine comprising a crankshaft geared to a central slide through a crank mechanism and to a grip slide through a cam actuator and a side slide, according to the invention, the crankshaft is provided with yet another crank mechanism having a pitman mounted in the side slide for reciprocation with respect thereto and for transmitting motion from the crankshaft to the grip slide during the working stroke thereof.

This structural arrangement of the horizontalforging machine increases the blank gripping force while maintaining constant the magnitude thereof during the working stroke of the central slide, this making possible the forging of parts from tube blanks requiring a gripping force by a factor of 1.5-3 greater than the rated force developed by the central slide, the blank gripping time being then adjustable as a function of the central slide working stroke to an optimum value by providing an appropriate profile of the gripping mechanism cam. The forging by the grip slide with a force equal to or greater than the rated central slide force is attained through provision of the additional crank mechanism transmitting the motion of the crankshaft through a side slide to the grip slide during the working stroke thereof.

In addition, this arrangement provides a forging action by the grip slide with a force equal to or greater than the rated central slide force.

It is advantageous to provide a grip slide working stroke ensuring equal speeds of the side slide and a pitman mounted thereon at the beginning of the grip slide working stroke.

This enhances the reliability of the machine and ensures a smooth transmission of motion to the side slide crank mechanism from the cam actuator. As a result, the crank mechanism develops an appropriate force on the grip slide during forging or blank gripping, the cam actuator, being engaged only to hold the dies in closed position during the idle backward motion of the grip slide, this substantially enhancing the reliability and the service life of the machine. The invention will now be described, by way of example only, with reference to the accompanying drawings wherein: FIG. 1 illustrates schematically a horizontalforging machine, according to the invention; FIG. 2 schematizes a grip slide cam actuator (section lI-Il on FIG. 1).

The horizontal-forging machine, illustrated, comprises a bed 1 accommodating a driving shaft 2 with a flywheel 3, a clutch 4 and a brake 5, a gear 6 being set in overhang position on the driving shaft 2. A crankshaft 7 is mounted in the bed 1 on sliding friction bearings and comprises two crank mechanisms. The crankshaft 7 receives a toothed wheel 8 meshing with the gear 6 and cams 9, 10 and is connected through a pitman 11 of one of the crank mechanisms to a central slide 12 with punches 13 and through a pitman 14 of the other crank mechanism to a slider 15 set in motion with a clearance "A" in a side slide 16 having a mechanism 17 protecting the slide 16 with levers 1 8, 19, 20 against damage in case of overload.The slide 1 6 is connected through the lever 18, 19, 20 to a grip slide 21 carrying a mobile die 22. The clearance "A" is selected to ensure the motion of the slider 1 5 in the side slide 16 during the idle stroke of the grip slide 21.

A fixed die 23 is mounted in the bed 1 of the machine. The side slide 1 6 has rollers 24 and 25 which contact respectively the cams 9 and 10.

The machine is powered by means of an electric motor 26 with a pulley 27 and a V-belt transmission 28.

FIG. 2 illustrates the crank and cam actuator of the grip slide 21. A spring 29 maintains the rollers 24, 25 in constant contact with the cams 9 and 10.

The horizontal-forging machine operates as follows.

Rotation of the electric motor 26 is imparted through the pulley 27 and the V-belt transmission 28 to the flywheel 3 incorporating the clutch 4. On a signal for starting the machine, the brake 5 releases the driving shaft 2, then another signal is fed to actuate the clutch 4 acting to engage the flywheel 3 with the driving shaft 2. The rotation of the shaft 2 is transmitted through the gear 6 to the toothed wheel 8 set on the crankshaft 7, the rotation thereof being transmitted through two chains: via the pitman 11 to the central slide 12 carrying the punches 13, and via the cams 9, 10, the rollers 24, 25, the pitman 14 and the slider 1 5, the side slide 16, the mechanism 17, the lever 18, 19, 20 to the grip slide 21 accommodating the mobile die 22.

At the beginning of the stroke, the cam 9 actuates the side slide 1 6 through the roller 24, while the pitman 14 sets in motion the slider 15, no motion being then transmitted from the slider 15 to the side slide 16 because of the gap "A" therebetween, this period of time being termed the idle travel of the grip slide 21.

As the slider 1 5 moves further with respect to the side slide 16, their speeds equalize, whereupon the grip slide 21 is moved by means of the crankshaft 7 through the pitman 14, the slider 15, the side slide 16, the mechanism 17, the levers 1 8, 19, 20, the dies 22, 23 closing at the end of the working stroke of the grip slide 21. As the crankshaft 7 continues to turn, the slider 1 5 backs away from the side slide 16, the dies 22, 23 being maintained closed by the cam 9. On completion of the heading operation, the central slide 12 returns to original position, the die 22 also starting to move together with the grip slide 21 toward the starting position, the motion to the grip slide 21 being imparted by the cam 10 through the roller 25, the side slide 1 6, the mechanism 17, the lever 18, 19, 20, the slider 15 then moving freely in the slide 1 6. After both the central slide 12 and the grip slide 21 complete their cycles, the mechanisms of the machine stop in starting position, the machine operation cycles then being repeated in the above sequence. If the clutch 4 is not disengaged, the machine will operate automatically.

Claims

1. A horizontal-forging machine comprising a crankshaft with a first and second crank mechanisms, and a cam actuator; a central slide connected to said crankshaft by the first of said crank mechanisms; a side slide connected to said cam actuator and through the second of said crank mechanisms to said crankshaft; a grip slide connected through said side slide, said cam actuator and the second crank mechanism to said crankshaft; a pitman of the second crank mechanism mounted in the side slide for reciprocation, thereby transmitting motion from said crankshaft to said grip slide during the working stroke thereof.

2. A horizontal-forging machine as claimed in claim 1, wherein the working stroke of the grip slide is such as to equalize the speeds of the side slide and the pitman mounted therein at the beginning of the working stroke of the grip slide.

3. A horizontal-forging machine, substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.