EP2456597A1

EP2456597A1 - Device for rolling an eccentric rotational component, rolling machine, method, and eccentric rotational component

Info

Publication number: EP2456597A1
Application number: EP10734641A
Authority: EP
Inventors: Karsten RÖTTGER
Original assignee: Ferroll GmbH
Current assignee: Ecoroll AG Werkzeugtechnik
Priority date: 2009-07-21
Filing date: 2010-05-31
Publication date: 2012-05-30
Also published as: KR20120068814A; WO2011009425A1; US20120196092A1; DE112010003041A5; DE102010008694A1; CN102666013A; CA2768622A1

Abstract

The invention relates to a tool (A) for rolling an eccentric rotational component (B) having an eccentric portion, in particular an eccentric worm shaft, wherein the tool (A) has a rotational device (R) having a rolling device (410), by means of which the surface edge zone of the eccentric rotational component (B) is strengthened in order to increase the service life thereof. In an embodiment example, a cutting process is performed before the rolling process.

Description

Device for rolling an eccentric rotary component, rolling machine and method and eccentric rotary component

[01] The invention relates to a tool for rolling an eccentric rotary component with an eccentric component, in particular an eccentric screw shaft, a method for producing a rolled rotary component and a rotary component.

[02] The field of application of eccentric screw shafts, which are also called mono pump shafts, could hardly be larger. From the food industry, through crude oil production to vehicle construction, shipbuilding and a large number of other areas of application, eccentric screw shafts can be found, where they are used to convey a wide variety of media.

[03] In almost all these applications, the quality and longevity of the eccentric worm shaft are in the foreground. Decisive for the service life and the qualitative properties of an eccentric worm shaft are the properties of the component edge zone, such as the surface roughness, the edge zone strength and the internal stress state.

[4] Eccentric screw shafts are produced by whirling in lengths of up to 6 meters. In many cases, the surfaces become hardened or hard chromed. Subsequently, a complex polishing of the surface.

[05] These cumbersome and expensive measures serve to increase the wear resistance and thus the increase in the service life. However, manufacturing processes such as hard chrome plating lead to higher costs and further negative accompanying properties. Although hard chromium plating results in a wear-resistant surface, premature failures often occur as a result of the corrosion between the chromium and the base material. [06] The task is to improve the state of the art.

[07] The problem is solved according to a first aspect of the invention by a tool for rolling an eccentric rotary component with an eccentric portion, in particular for rolling an eccentric screw shaft, wherein the tool has a rotating device with a rolling device, so that the eccentric portion through the Rolling device is rollable.

[08] This tool can be used to smooth and reshape the surface. Furthermore, during rolling, solidification or improvement of compressive residual stresses with respect to corrosion and wear can be achieved. Thus, an eccentric worm shaft can be provided, in which an extension of the component life is ensured. [09] The following is explained:

[10] The "tool" can be operated with a rolling machine, such as a whirling machine or a lathe, in which tool the eccentric screw shaft to be machined can be inserted so that the eccentric portions are rolled.

In particular, the "eccentric portion" of the eccentric rotary component has a pitch, so that, for example, in the case of an eccentric worm shaft, a conveying principle can be realized as with an Archimedean screw this non-eccentric portion is used in particular for inclusion in a motor.

[12] In the case of the "rotation device", rotation takes place in particular about an axis of rotation of the eccentric rotational component, which axis of rotation can be aligned axially or coaxially to the conveying direction of an eccentric screw shaft.

[13] By rolling, particularly smoothing or rolling, the surface of the eccentric component can be deformed by the rolling device the rolling device carried out a circumferential rolling. [14] In one embodiment, a fixed stator is provided, which is configured statically in relation to the rotation device. About this stator, a flanging can be done to a rolling machine directly or via a tool holder. [15] In order for a screw pitch of an eccentric rotary member to be rollable, the rolling means may comprise a hydrostatic roll-flat member having a ball insert with a hard material component. Such hydrostatic smooth rolling elements can be configured, for example, according to DE 103 40 267 A1 or DE 101 33 314 A1. For processing the eccentric rotary component ceramic components can be used, so that the hard material component consists wholly or partly of ceramic. The ball can be made of ceramic in the ball insert or coated with ceramics. As a result, high injection pressures can be achieved at certain points. [16] In another embodiment, the rolling device or the smooth rolling element has a stroke of approximately between 1 mm and 20 mm, wherein the stroke is in particular about 8.5 mm. As a result, a compensation of inhomogeneities of the surface of the eccentric worm shaft can advantageously be carried out with little wear. [17] In order to reduce the number of revolutions of the rotary means for full rolling, the rolling means may have two, three, four or more inwardly directed rolling elements. [18] In a further embodiment, the rotation device is coupled to a drive unit of another rolling machine. Thus, the rotation device can be impressed by means of the rolling machine, so that rolling on the eccentric screw shaft can take place completely.

[19] The tool preferably has a displacement device. As a result, surfaces can be rolled along a rotational axis direction of the rotary component. It should be noted that the rolling machine can also or alternatively have such a displacement device. In particular, a whirling machine, the eccentric rotary member so lead by means of feed through the tool that a displacement of the hydrostatic smooth rolling elements in or against the feed direction can be omitted.

[20] In order to adapt the rolling device to the component to be machined, in particular the eccentric rotary component, the tool can have a centering device. This centering device can be designed so that a uniform adaptation to the eccentric rotary component takes place.

[21] In another embodiment, the tool is configured so that a rolling force of between 1,000 N and 20,000 N acts on the eccentric rotary member. Depending on the intended use, a rolling force of about 4,000 N may be particularly preferred. Thus, the eccentric screw shaft advantageous properties can be impressed. This is below Another reason is that the rolling force can cause a change in the surface of the eccentric rotary component.

In order to ensure a further improvement of the properties for the eccentric screw shaft, the tool can be designed so that a hardening of a surface rim zone by 2% to 40%, in particular by 10% to 20%, takes place.

[23] In another embodiment, the rotator may be capable of imparting a rotational speed of 100 revolutions per minute to 2,000 revolutions per minute, in particular between 500 revolutions per minute and 800 revolutions per minute.

[24] The rotational speed of rotation may be higher than the rotational speed imparted to the eccentric rotating member such that the entire surface of the eccentric rotating member is rollable. The rotator speed may be coupled via a transmission to the speed of the eccentric rotary member.

In order to produce a rolled eccentric rotary component from an original rotary component, the tool may have a peeling device for machining an original rotary component, so that the eccentric rotary component is produced by the machining. [26] In a further aspect of the invention, the object is achieved by a rolling machine, in particular a whirling machine or lathe, with a previously described tool. [27] Thus, a machine can be provided by which a rolled eccentric rotary member can be produced. It should be noted that it can be in the vortex machines to standard machines for generating eccentric screw shafts. [28] In a further aspect of the invention, the object can be achieved by a method for producing a rolled eccentric rotary component, in which an eccentric rotary component is produced by means of the above-described rolling machine. In this case, the eccentric rotary component or the Urrotationsbauteil is mounted in the rolling machine with the tool described above so that by machining the eccentric rotary member can arise.

[29] Furthermore, the object is achieved by an eccentric rotary component, which can be produced by the method described above. [30] In an additional aspect of the invention, the object can be achieved by an eccentric rotary component in which an eccentric portion is rolled.

[31] In order to provide a low-wear eccentric rotary member, a surface peripheral zone of the eccentric portion may be solidified by 2% to 40%, particularly by 10% to 20%.

In another embodiment, the eccentric portion is rolled with a rolling force of between 1,000 N and 20,000 N, in particular with 4,000 N. Thereby, a special way of machining the surface of the eccentric rotary member can be provided.

[33] In order to roll previously hardened eccentric rotating components, a part of the eccentric rotating member may be hardened before rolling. Thus, prefabricated and hardened eccentric screw shafts can be rolled.

In a further aspect of the invention, the object can be achieved by a rolling process for producing a rolled eccentric rotary component, wherein in a first step, a peeling of a Urrotationsbauteils and in a second step, an eccentric rolling and the two steps in one Walzmaschinenaufspannung done. The peeling can be carried out by means of a ceramic tool.

[35] Thus, an eccentric rotary component can be produced from a primary rotation component which is also rolled at the same time. A separate clamping and consequent errors or material or processing impairments can thus be omitted.

[36] The peeling tool can be combined with the rolling tool, or it can be a tool change without Aufspannwechsel. When the peeling tool and the rolling tool are combined, a distance between the two tools is preferably adjustable. [37] In the following, the invention will be explained in more detail using an exemplary embodiment with the aid of FIGS. 1 to 6. Show it

1a is a schematic frontal view of a rotation device with a rolling device, FIG. Ib is a further schematic frontal view of the rotation device with rolling device, FIG.

Fig. 2 is a schematic side view of the rotation device with

Rolling device and a stator,

3 shows a schematic frontal view of a partial section of the rotary device,

4 shows a schematic spatial view of the rotating device with rolling device and associated stator,

5 shows a schematic spatial view of the rotating device with rolling device with an inserted eccentric screw shaft and

Fig. 6 in a schematic side view of a hydrostatic

Smooth rolling element, which acts on the eccentric screw shaft, and a schematic frontal view of the eccentric screw shaft. [38] The operation of the invention will be explained below. Reference should be made in particular to FIG.

[39] A tool A has a rotating device R with attached hydrostatic smooth rolling elements 410. The tool A is coupled to a whirling machine.

[40] In the following, an eccentric screw shaft B is conveyed by the tool A in a feed direction V by means of the swirling machine (not shown). The feed rate is 0.2 mm per revolution of the rotary device R. The whirling machine is designed so that eccentric portions of the eccentric screw shaft B are compensated at a contact feed position 510, so that a vertical and / or horizontal displacement of the hydrostatic smooth rolling elements 410 is omitted. Thus, the turbomachine ensures that at a certain position with respect to the feed direction, the eccentric screw shaft always has the same vertical and horizontal position perpendicular to the feed direction during the conveyance of the eccentric screw shaft B.

[41] For rolling, the rotating device R rotates in the direction of the arrow around the eccentric screw shaft B. The hydrostatic smooth rolling elements 410 fastened with the rotating device act on the eccentric screw shaft B with a force of 4,000 N. This results in rolling of the eccentric screw shaft B. By the rotation the rotation device R, the eccentric screw shaft B is fully rolled at the contact feed position 510.

[42] The whirling machine conveys the eccentric worm shaft B further in the feed direction V, so that a non-rolled part of the eccentric screw shaft B abuts against the contact feed position 510. By rotating the rotary element R and the associated rolling by means of the smooth rolling elements of the previously non-rolled portion of the eccentric screw shaft B is rolled.

[43] This procedure is repeated until the entire eccentric screw shaft B has been rolled.

[44] As can be seen from FIG. 6, the smooth rolling elements 410 have a spherical tip 630, 410.2. Due to the spherical shape, the smooth rolling element 410 of the eccentric screw pitch can be slightly adjusted. [45] The structure of the tool A will be explained below with reference to FIGS. 1 to 4.

[46] The rotation element R is connected to a stator. The stator comprises a receptacle 10 with three sealing pistons 270 and a threaded pin 40, as well as a bearing ring 100 and a cam ring 50 and two angular contact ball bearings 20, 80. The tool A is connected by means of the stator with a standing part of the whirling machine with its sealing piston 270 and the driver rotatably 250. The driver 250 secures the stator S against rotation. [48] A cooling piston 270, which is required for the rolling process, is supplied via a sealing piston 270 and passed via bores B 1 of the receptacle 10 into a cavity H of the housing 70. As a coolant oil is used alternatively. The shaft sealing rings 150 prevent unwanted fluid loss from the cavity H. The pump elements 190 rotate in the direction a (see FIG. 3) about the stationary cam ring 50, which has a lifting height h = 7 mm.

The threaded pin 40 prevents turning of the cam ring 50. The 7 mm lifting height of the cam ring 50 are converted into an axial stroke movement on the pistons of the pump elements 190. The sliders 170 prevent the generation of a transverse force on the pistons of the pump elements 190.

[50] The rotation device R comprises the housing 70 with the centering unit and six holes for screwing the tool A to the whirling machine. In the housing 70, the five pump elements 190 are mounted.

[51] Sliders 170 prevent direct contact of the pistons of the pump elements 170 with the cam ring 50. The sealing flange 210 is in screwed the housing 270 and receives the shaft seal 150, which is held by the holding plate 230 in position.

[52] The intermediate piece 300 is screwed against the housing 70. This intermediate piece 300 receives the smooth rolling elements 410 in addition to the pressure limiting valve 370 via the adapter 350, which act here as a rolling device.

[53] The ring 470 is used to stabilize the smooth rolling elements 410. Between the housing 70 and the intermediate piece 300 there is the cover 130 screwed to the housing 70. The cover 130 absorbs the shaft sealing ring 150. The roller rolling elements 410 acting as rolling device drive the ball insert 410.1 within its stroke of 8.5 mm until the ball 410.2 has contact with the workpiece surface.

By the rotation of the rotary element R with radially inwardly standing rolling elements with simultaneous feed movement, the workpiece is continuously smoothed or firmly rolled. Due to the freely selectable pressure and feed, the roll results can be excellently influenced and optimized.

[55] The use of hard-material components in the smooth-rolling elements 410 makes it possible to smooth-roll hardened components.

Claims

claims:

1. A tool for rolling an eccentric rotary component with an eccentric portion, in particular an eccentric screw shaft, characterized in that the tool has a rotation device with a rolling device, so that the eccentric portion is rollable by the rolling device.

2. Tool according to claim 1, characterized by a stationary relative to the rotating device stator.

3. Tool according to one of the preceding claims, character- ized in that the rolling device comprises a hydrostatic smooth rolling element, in particular a ball insert with a hard material component.

4. Tool according to one of the preceding claims, characterized in that the rolling device or the smooth rolling element has a stroke of between 1 mm and 20 mm, in particular of 8.5 mm.

5. Tool according to one of the preceding claims, characterized in that the rolling device has two, three, four or more smooth rolling elements.

6. Tool according to one of the preceding claims, characterized in that the rotation device is coupled to a drive unit of a rolling machine.

7. Tool according to one of the preceding claims, characterized by a displacement device.

8. Tool according to one of the preceding claims, characterized by a centering device.

9. Tool according to one of the preceding claims, characterized in that it is designed so that a rolling force of between 1,000 N and 20,000 N acts on the eccentric rotary component, in particular of 4,000 N.

10. Tool according to one of the preceding claims, characterized in that it is designed so that a solidification of a surface edge zone by 2% to 40%, in particular by 10% to 20% occurs.

11. Tool according to one of the preceding claims, characterized in that the rotating device is a speed of 100 revolutions per minute to 2,000 revolutions per minute aufprägbar, in particular between 500 revolutions per minute and 800 revolutions per minute.

12. Tool according to one of the preceding claims, characterized in that it comprises a peeling device for machining an Urrotationsbauteils, so that by machining the eccentric rotary member is generated.

13. Rolling machine, in particular whirling machine or lathe, with a tool according to one of the preceding claims.

14. A method for producing a rolled eccentric rotary member, wherein an eccentric rotary member is produced by means of the rolling machine according to claim 13.

15. eccentric rotary component, which is produced by the method according to claim 14 and / or with a tool according to one of claims 1 to 12.

16. eccentric rotary member in which an eccentric portion is rolled.

17. An eccentric rotary member according to claim 15 or 16, wherein a surface peripheral zone of the eccentric portion is hardened by 2% to 40%, in particular by 10% to 20%.

18. eccentric rotary member according to one of claims 15 to 17, characterized in that the eccentric portion is rolled with a rolling force between 1,000 N and 20,000 N, in particular of 4,000 N.

19. eccentric rotary member according to one of claims 15 to 18, characterized in that a part of the eccentric rotary member is hardened.

20. rolling process for producing a rolled eccentric rotation tion component, wherein in a first step, a peeling of an urovation tationsbauteil and in a second step, an eccentric rolling takes place and the two steps take place in a Walzmaschinenaufspannung.