DE909283C - Use of a helical curve guide when milling gears in the single-part process - Google Patents

Description

Use of a helical curve guide when milling gears in the single-part process It is known in gear shaping machines, which is according to the Number of teeth of the workpiece Uniformly rotating tool when shaping helical gears an additional rotation corresponding to the tooth slope through a helical curve guide granted. The continuous partial movement is thus with the work step and with the decline of the tool in the starting position supplemented by this additional rotation, so that both rotary movements are constantly superimposed.

In the continuously working hobbing process, the partial movement a continuously acting additional rotation is given by a differential operation, so that here, too, both rotary movements are superimposed.

Furthermore, generating grinding machines working in the single-part process known, the additional rotation corresponding to the tooth slope through a flat sliding guide to be given to the workpiece with sliding pegs via roller cylinders and roller belts.

In the case of gear milling machines working in the single-part process, the Tooth helical gears through the workpiece Change gears adjustable gear a rotary movement corresponding to the tooth incline and through a another gear unit issued a temporary partial movement. Either the tool with the tool slide or the workpiece with the workpiece slide postponed. The rotary movement must always be in an inevitable relationship for the feed, and also the drive for the return of the workpiece in rapid traverse must take place in the same inevitable proportion. The rapid traverse speed is therefore limited, as the gears for feed and rotation in the ratio of feed and rapid traverse speed must run faster.

In contrast, the invention relates to the use of a helical one Curve guide with counter guide to produce a corresponding tooth slope helical displacement of the workpiece when cutting helical gears in the single-part process, especially in gear milling or broaching machines, where the workpiece is moved past the tool to form a tooth gap. Of the The helix angle of the curve guide can be between 0 and 9o0, where the drive of the cam guide depending on the helix angle to be milled, taking into account the angle of friction can be either a rotary movement or a sliding movement.

By using this a helical curve guide will be the deficiencies of the known facilities described above are eliminated and a simple geared structure achieved with simple movement conditions.

There is no longer a special workpiece or tool slide, and the helical displacement of the workpiece takes place immediately without further ado Intermediate gear and is therefore very precise.

The workpiece rotation necessary for the beveling of the teeth is not more dependent on the feed, the feed movement can therefore be both uniform as well as non-uniformly.

The rapid traverse speed is practically unlimited as there are no High speed gears are more necessary and the usual feed screw with nut replaced by a cylinder with piston and pressure oil actuation can be.

The use of the helical curve guide can according to the invention also take place in such a way that the helical displacement of the workpiece from the Center of the workpiece is done first to one side, then to the other.

According to one embodiment of the invention, the partial movement begins only after completion of the helical displacement (back and forth); while The part movement then does not cause any workpiece displacement. This is achieved when the action of the helical curve guide is switched off during the partial movement is or if the helical, curved guide and the counter guide on the Partial movement participate.

According to another embodiment of the invention, the partial movement takes place during the helical return. This is achieved when the helical Curve guide and the counter guide during the workpiece return on the partial movement take part.

It is useful to determine the beginning, end and size of the helical displacement, the rapid retraction and the partial movement by the tool itself or its carrier with the help of attacks or the like. To control. These movements can also be hers Drive received from the tool or its carrier.

Feed and rapid traverse of the workpiece can be: either both or only one of them, also in connection with the partial movement, is hydraulically driven will.

In the drawing, the invention is illustrated by way of example shown. It shows picture i a helical curve guide with hydraulic Drive of the sliding movement, Figure 2 with a mechanical drive, Figure 3 a different one Execution according to Fig. I, Fig. 4 has a helical cam guide that drives you received as a rotary movement by the tool or its carrier, Figure 5 is a front view this guide, Figure 6 a helical curve guide, which is its drive as Sliding movement received by the tool or its carrier.

A workpiece i is coaxial with a helical curve guide 2 connected, which slides in a counter guide 3. Workpiece i with cam guide 2 is with the help of an arm -. (Pictures i and 2j through one in a cylinder 5 sliding piston 6 (pictures i and 3) or by a motor 7 via threaded spindle 8 (Fig. 2) pushed past tool 9. By known means, the feed reversed in rapid traverse and the partial movement initiated.

In the pictures q. to 6 further embodiments of the invention are shown, show, for example, the circuitry and operation of the entire device. At the Tool 9 (or tool carrier) is a stop io arranged through the a roller i i a rotary movement via a lever 13 held by a tension spring 12 on a tooth segment 14th transmits. According to pictures q. and 5 is the stop io about arranged acting in the direction of the tool axis, so that the segment 14 rotates transmits to a spline shaft 17 via a gear 15 and coupling 16. The drive the helical curve guide 2 is in this case a rotary movement, which is generated and controlled by the tool 9.

When sharing, the clutch 16 is disengaged and a pawl 18 of a graduated disk i9 fixedly connected to the counter-guide 3 is released. The counter lead 3 is then together with disengaged clutch 16, index plate i9 and curve guide 2 by a worm gear 2o by one Tooth gap shared. It goes without saying that during this movement the cam guide 2 in the Counter guide 3 cannot be moved. During the partial movement, workpiece and tools are removed from one another in a known manner, or the splitting occurs during a gap in the row of teeth on the tool circumference, as is also known is. After the partial movement has ended, the clutch 16 is automatically re-engaged.

According to Figure 6, the stop acts in a radial direction to the tool, so that over toothed segment 14 a shaft provided with toothed grooves 21 and wedges 22 moved together with the helical cam guide 2 and the workpiece i will. The further sharing takes place in the manner described above. In this version the helix angle of the workpiece can also be o ', i.e. H. the workpiece can be a spur gear with straight teeth.

Claims (9)

PATENT CLAIMS: i. Use of a helical curve guide with counter-guide according to patent 746561 to produce a corresponding tooth slope helical displacement of the workpiece when cutting helical gears in the single-part process, especially in gear milling or broaching machines, where the workpiece is moved past the tool to form a tooth gap. 2. Use of a helical curve guide according to claim i, characterized in that that the guide can have skew angles of 0 to 9ö °. 3. Applying a helical Curve guide according to claims i and 2, characterized in that the drive of the Cam guide (2) is either a rotary movement (15) or a sliding movement (21). 4. Application of a helical curve guide according to claims i to 3, thereby characterized in that the helical displacement of the workpiece from the center of the workpiece from first to one side, then to the other side. 5. Application of a helical curve guide according to claims i to 4, thereby characterized in that the helical displacement of the workpiece is independent takes place from the partial movement, so that no tool shift occurs during this. 6. Application of a helical curve guide according to claims i to 4, thereby characterized in that the partial movement during the helical return of the Workpiece takes place. 7. Application of a helical curve guide according to claims i to 6, characterized in that the movements of the workpiece through the tool (9) or its carrier is controlled or driven. B. Application of a helical curve guide according to claims i to 7, characterized in that that the dividing disk (i9) is firmly connected to the counter guide (3) and when dividing Workpiece (i), helical curve guide (2), counter guide (3) and the for Shift used carry members (16, 17 or 21, 22) rotated as a whole will. 9. Use of a helical curve guide according to claims i to 8, characterized in that feed and rapid traverse of the tool, either both or just one of them, done hydraulically.