DE2439957A1 - METHOD AND DEVICE FOR COLD ROLLING PARALLEL PROFILES E.g. OF TOOTH PROFILES FROM THE FULL MATERIAL - Google Patents

Description

tentanwälte

| p | .. |, .. KL
Or ..! Ng.R.BEETZ Jr.
Munich 22, Ste.nsdorf.tr. 10

262-23-072P (23

August 20, 1974

Ernst Grob, cold rolling machines, Mannedorf (Switzerland)

Method and device for cold rolling parallel profiles z. B ₀ of tooth profiles from the full material

The invention relates to a method and an apparatus for cold rolling parallel profiles, e.g. B. from Tooth profiles, from the solid, in which the workpiece through regular, abrupt rolling processes of profiled rollers rotatably mounted in driven roller heads step by step and in small profile sections from the profile base to the workpiece surface is displaced "

In this rolling process described in DT-PS 1 016 222 the profile grooves are made by freely rotating rollers

262-xi831-Sd-r (OK)

80 9 8 10 / IM

generated, which are stored in rotating roller heads. the Profile rolls thus revolve on a circular path and deform the workpiece in a large number of partial rolling processes, in which the material is loaded beyond its flow limit and from the profile base in the direction of the profile teeth is displaced. Before the start of the rolling process, the rolling heads are free to the desired profile depth, i. H. without Intervention in the material, discontinued. The rotating profile rollers protrude from the front edge of the workpiece slowly one after the other according to their circular trajectory into the material. The profile is rolled in to its full depth and final shape when the The front edge of the workpiece is located vertically below the axis of rotation of the roller head. B. a gear or a Zahnwellcj are made, then the clamped Workpiece rotated either intermittently or continuously and at the same time slowly advanced in the axial direction, so that then one after the other in a helical deformation zone of the workpiece, the adjacent profiles are rolled from the solid material.

In the case of the workpieces to be manufactured using this process, in the vast majority of cases the tooth profile extends almost or completely to one end of the workpiece. The short spigots that sometimes occur at the end of the toothing, which are smaller than the root diameter of the workpiece, are neither sufficient in length nor in diameter for proper clamping _s First, the diameter of the rolling head needs a certain distance from the clamping device to the end of the toothing, and secondly, the diameter of the clamping spigot must be as large as possible than the diameter of the toothing in order to absorb the large torsional forces that occur through the largest possible lever arm on the clamping diameter.

609810/0440

to be able to. Of the many hundreds of workpieces that have so far been geared using this process, there were at most 1-2 parts, which had a toothing in the middle, so that they could be rolled in drawing by you clamped them at the smaller diameter end.

The object of the invention is to provide a method for cold rolling of parallel profiles, in particular tooth profiles, in which workpieces without front edges, indentations or bundles can be edited. This object is achieved in that at the beginning of the Rolling process by synchronously feeding two opposite rolling heads into the full workpiece up to Profile depth is inserted.

If this piercing process takes place without switching on the workpiece feed at the same time, the forming work is finished very large for every single step in uniform, because always entire arc-shaped segments have to be reshaped. For this reason it is beneficial when piercing to switch on the workpiece feed at the same time and that Moving the workpiece in a straight line. Thereby the individual Umf arm s orit te smaller, about commaf oi'iriig, so that for each Partial rolling process overcome a much lower resistance must be, whereby machine and tool are spared and the accuracy of the workpiece can be improved.

Must for certain workpieces provided with a collar If the tooth profile is brought close to this collar, then it is advisable to carry out the grooving by pushing. The workpiece is pushed through the machining or rolling zone from its unmachined end. If such workpieces were rolled in the drawing, in which the

609810 / 044Q

Workpiece feed engages the machined workpiece end and pulls it through the processing zone, then would the feed path necessary for penetration of the penetrating rollers to the profile depth is lost as a full tooth profile. In the case of workpieces for which a short run-out of the tooth profiles is important, this is used for grooving Required feed distance (approx. 5-10 mm depending on the workpiece) covered by pushing. After reaching the full Tooth depth, the feed is reversed and the workpiece is rolled along its entire length by drawing.

Cold rolling in drawing is more advantageous because it allows on different material pressures on both sides each Tooth direction errors attributable to the roller profile avoided as detailed below.

The piercing process can also be used to produce 01-pockets and are used to create crowned tooth profiles Depending on the feed, a corresponding crowning both in the tooth root and on the flanks.

The invention is described in more detail below with reference to the drawing. Show it:

1 a, b show a schematic side view of a device for cold rolling tooth profiles into a Full rod,

Fig. 2 is a schematic representation of the rolling process in slotting,

3 shows a schematic representation of the rolling process in pulling,

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Fig. K is a schematic representation of the partial rolling processes during grooving,

5 shows a schematic representation of the partial rolling processes during plunge-cutting with the plant advanced tricky,

6 shows a schematic representation of the piercing process in the case of a workpiece with a collar,

7 shows a side view of a partially machined solid bar.

The known rolling device shown in FIG. 1 contains two synchronously driven rolling heads 1 and 2, which are arranged on the opposite sides of a workpiece h clamped in a receptacle 3. Each of the roller heads consists of a carrier 6, 6 'which is firmly drawn onto a drive shaft 5, 5' and in which profile rollers 7, 7 'are freely rotatably mounted. Both roller heads 1 and 2 run in the direction of arrows 8, 8 ¹ . The workpiece k is advanced in the direction of the arrow 9 and rotated about its axis B in the direction of the arrow 10.

In Fig. 2 a rolling process is shown in slotting and in Fig. 3 shows a rolling process in drawing, the gear train being drawn in wider in each case the deformation zone U is always within the range from the rolling head 1 via the gear 11 and the headstock 12 to the workpiece running gear train. When rolling in drawing according to FIG. 3, however, the deformation zone U is always outside the Gear train.

B09b'i0 / ÜA40

For example, if the rolled-in tooth profile in solid bars is to run to one end of the bar, then must be worked in pushing because there is no possibility of clamping the workpiece for machining in Pulling without reclamping is given. Only workpieces In particular, solid bars that have a recess at the end of the toothing can be rolled while drawing, since the rolling heads can be fed to the tooth depth in this recess before the start of rolling.

However, the rolling in shaping leads to tooth direction errors due to a twisting of the still unprocessed Workpiece part. In Fig. 7 is a tooth profile of a solid bar with a feed stage of the tooth run-out of S / 2 shown. The workpiece is moved by the feed rate per rotation S advanced in the longitudinal direction, but since two roller heads are provided, the advance stage is S / 2 " When forming by the next sub-step S / 2, the resistance of the material is on side A of the forming zone smaller than on side B because the full material is still present on the latter, while on side A only the tooth rib remaining between the tooth gaps offers resistance. Because of this different level of resistance On both sides of the tool engagement, the material gives way on one side during the forming process, and indeed all the more so more, the greater the feed rate S or S / 2. This evasion of the material causes a twisting of the tooth profile or »a Zalinrichtungserror,

The evasion of the material occurs in both processes equally, but has a completely different effect. When rolling in the push, where the

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The deformation zone lies within the gear train, the material shift occurs fully in the tooth direction, d. H. the tooth misalignment arises. As when rolling in pulling However, the deformation zone is outside the gear train, the material shift that occurs cannot enter the Enter the tooth direction, because with each new rolling process, the material that has already been moved is rolled beforehand. Though there is also a twisting of the bar that has already been rolled when rolling while drawing, but this does not lead to a twist Tooth misalignment because that is outside the gear train lying material is twisted, but the tooth profile is rolled onto the twisted material. The tooth direction When rolling in drawing is always perfectly straight, so that the aim is to pull all workpieces to roll »

As already explained above, the cold rolling of workpieces is in the process of drawing, the tooth profile of which extends to a workpiece end runs through, according to the known method only possible if the workpieces are previously turned have «by the piercing process shown schematically in FIG According to the invention, workpieces can also be rolled in the drawing, without first being in a separate one A ring recess or recess must be incorporated. When grooving the rollers without workpiece feed the material is gradually displaced in circular arcs 13 »14 determined by the radius of the roller head, whereby the deformation work of each individual partial rolling process is extremely large. It can be reduced considerably if the workpiece feed is actuated at the same time as the plunge-cut (cf. FIG. 5), because this is no longer the case Circular arc segments, but smaller, comma-shaped segments

BO 98 1 0/044

must be worked out for each partial rolling process.

In FIG. 6, the piercing process is shown in the case of a workpiece 16 provided with a collar 15, in which the tooth profile should extend from the front end 17 to as close as possible to the collar. The machining of this workpiece in the slotting would lead to the tooth direction error described above. However, in order to enable rolling while pulling, the two rolls 7> 7 ¹ must be pierced in the direction of the arrows E by advancing the two rolls. However, since the grooving during drawing results in an undesirably long tooth run-out, while the collar 15 is simultaneously brought up to the movement paths of the rolling heads, it is inserted in the pushing process and then rolled while drawing after the full tooth depth has been reached. The tooth direction error of the tooth profiles that occurs during grooving is compensated for by the subsequent, superimposed rolling process in drawing »

The possibility of grooving ^ opens up a wide range of applications for the cold rolling of precision tooth profiles and enables the cold rolling of a wide variety of workpieces that previously had to be milled.

A prime example of the need for rolling in Drawing with grooving are universal joint shaft end pieces with SAE profiles. Such parts come in large quantities and different sizes

6098 1 0 / CU40

Claims (1)

Patent claims [1, ^ process for cold rolling of parallel profiles, z, B "of tooth profiles, from the solid, in which the Material through regular, sudden vaiz processes of profile rollers rotatably mounted in driven roller heads gradually and in small profile sections from the Profile base is displaced to the workpiece surface, characterized in that at the beginning of the rolling process into the full workpiece by synchronously infeed of two opposite rolling heads is inserted to the depth of the profile, 2o method according to claim 1, characterized in, that the workpiece is moved in a straight line when plunging = 3 η method for cold rolling parallel profiles, Zc B, Zahriprof il en , in a workpiece with a collar, the profiles reaching from one workpiece end to close to the collar, according to claim 2, characterized geke η η ζ calibrated that im Push until it is pierced close to the collar and, after reaching the profile depth, is rolled by drawing. .. 4 "Method according to one of claims 1 to 3 j thereby marked. that for the production of profile recesses and crowns the rollers are fed in a pulsating and synchronous manner depending on the feed rate, 5. Device for performing the method according to 60 981 Q / CH 4Q one of claims 1 to k, with two roller heads engaging on opposite sides of the workpiece, in which at least one profile roller is freely rotatably mounted and with a rotatably driven workpiece feed, geke η marked by a "drive for synchronous feed of roller heads 1 and 2, 609b 10/0440 Λ / L e r s e i f e