DE2025659A1 - Gear rolling machine - Google Patents

Description

May 25th I97o CH 13 P 8

Charles Churchill Limited

Birmingham

England

GEAR ROLLING MACHIME

The invention relates to gear rolling machines in which two mutually rotating forming rollers a feed is given such that they a centrally arranged workpiece touch. Increasing the feed pressure to a sufficiently high value causes the workpiece deforms and takes on a shape that corresponds to that of the rollers.

In general, machines of this type have a fixed Head and a slide head, each head carrying a forming roll. The sliding head is made by means of a hydraulic cylinder a feed is issued, the hydraulic cylinder being supported against a boom serving as a counter bearing. Stress responses are generally triggered by bending the

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Boom added to the machine frame. Typically, the jib is supported by additional struts between its free end and its fixed end, to hold the bends in reasonable limits. This arrangement requires large cross-sections in the machine frame so that it is sufficiently rigid to ensure that the deflections remain small and have no effect on the alignment of the machine, since the slideways are generally arranged on the frame.

According to the invention, a gear rolling machine is proposed which is characterized by two mutually rotatable Forming rollers attached to heads, one of which is sliding and the other is either sliding, or firmly arranged 1st, and by /, swei each on one of the Heads attached hydraulic cylinders, their piston rods are attached to the opposite head and run parallel and essentially symmetrically to the load axis

The drawing depicting an embodiment of the invention shows , in part, an end view of the machine

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on average. One arranged on a conveyor Io Workpiece 3 lies between two rotating forming rollers 1 and 2 which are driven by shafts 21 and 22. Around To facilitate the engagement of the teeth, the workpiece can be given a pre-rotation before the forming rolls an advance is granted. The forming roller 1 is on a slide head 11 and the forming roller 2 is on a head 12 attached, which is arranged either fixed or slidable.

Hydraulic cylinders 4 and 5 are each arranged on the heads 11 and 12, their piston rods 6 and 7 being fastened by means of screws 16 and 17 to the opposite head 11 and 12, respectively. When oil is supplied under pressure to the respective sides of the cylinders, Ä

the piston rods 6 and 7 are retracted and the heads 11 and 12 move on slideways 8 and 9 along towards each other. The piston rods have adjustable end stops 26 and 27 to limit the forming rollers issued feed movement. The piston rods 6 and 7 are arranged symmetrically to the load axis, so that no resulting forces from the machine

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frame or the position-determining slideways 8 and 9 are transmitted through it . This can be much easier to build the frame * than before because Eelastungsab- instructions are restricted to the gradients ends parallel to the loading axis piston rods and bends are avoided.

The workpieces are provided with preformed teeth, for example by hobbing, before they are fed to the gear rolling machine , which takes care of the final machining.

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Claims (2)

PATENT CLAIMS l.y gear rolling machine, characterized by two mutually rotatable forming rollers (1, 2) which are attached to heads (11, 12), of which one (11) is sliding and the other (12) is either sliding or fixed, and by two% each attached to one of the heads (11, 12) Hydraulic cylinders (4, 5), their piston rods (6, 7) each on the opposite head (11, 12) are attached and run parallel and substantially symmetrically spaced from the load axis. 2. Machine according to claim!, Characterized by adjustable End stops (26, 27) on the piston rods (6, 7) to limit the Forrawalzen (1, 2) to ^ issuing feed movement. 000850/03 Empty soap