WO2006010709A1

WO2006010709A1 - Gear cutting machine

Info

Publication number: WO2006010709A1
Application number: PCT/EP2005/053350
Authority: WO
Inventors: Martin Duerrenmatt; Peter Moeri; Walter Simon
Original assignee: Lambert-Wahli Ag
Priority date: 2004-07-26
Filing date: 2005-07-13
Publication date: 2006-02-02

Abstract

The invention relates to a gear cutting machine (1), characterised by the following features: a cutter (3) with a first rotational axis (Y1), a first group with a first spindle (61) and a steady (62), to hold a first workpiece (6) with a rotational axis (X), a second group with a second spindle (71) and a steady (72), to hold a second workpiece (6) with the rotational axis (X), guides (53), parallel to said workpiece axis (X), for alternate displacement of said first group or said second group to a machining station, where gears can be cut by said miller in the first or the second workpiece.

Description

Gear cutting machine

Technical area

The present invention relates to a gear cutting machine, for example, a machine for milling threads, gears or screws according to the independent device claim and to a method for machining gear teeth on workpieces according to the independent method claim.

State of the art

Gear machines are already known. However, the gearing process is relatively expensive, especially for gears with large modules, for longer threads or for gears with a large number of teeth, which must be individually gef rasst.

The time required to machine a gear from a workpiece involves many unproductive "dead" ones

Times, for example during loading and unloading of the workpieces. Fast amortization of gear machines is required to be able to machine as many gear teeth as possible in a predetermined period.

Esänd Verzahnungsmaschinen known which have several independent Wälzf räser and / or thread mill to work on several workpieces at the same time. However, such machines also have multiple tool motors, and thus are usually bulky, expensive, and difficult to program. Moreover, the problem of lost dead times is not solved. Presentation of the invention

It is therefore an object of the present invention to provide an improved gear cutting machine.

The other objective is to minimize the unproductive dead times during which no workpiece is machined, and to increase speed and productivity.

The flexibility is also to be increased while keeping the space and the price of the machine low, for example by reducing the number of drive motors. The machine should preferably be CNC-controllable.

According to the present invention, these objects are achieved in particular by the features of the independent claims. Further advantageous embodiments are also evident from the dependent claims and the description.

In particular, these goals are achieved through a

Gear cutting machine achieved with the following characteristics: ^" '

a milling cutter having a first axis of rotation for machining teeth,

a first group having a first spindle and a counter holder for rotationally driving a first workpiece about a workpiece axis,

a second group having a second spindle and an anvil for rotatably driving a second workpiece about the workpiece axis, guides parallel to the designated workpiece axis for alternatively shifting the named first group or group to a processing station where gears can be milled in the first or in the second workpiece from the named cutter. This has the advantage that the unproductive times during which only loading or unloading can be reduced or even completely eliminated, so that the productivity can be substantially increased.

This also has the advantage that only the workpiece spindle, the corresponding counter-holder and preferably the workpiece motors must be duplicated. By contrast, the tool group remains essentially unchanged, so that this improvement can even be applied to existing gear cutting machines.

Another advantage is that the number of components, especially expensive or bulky components, can remain low.

Brief description of the figures

In the following, preferred exemplary embodiments of the invention will be described in more detail with reference to the attached drawing. It shows:

FIG. 1 is a schematic representation of a machine tool in a perspective view from the front, the machine being in a position for machining the workpiece with a hob. FIG.

Ways to the execution of the EΞrfindung

The illustrated gear machine 1 is a Wälzf milling machine with a cutter 3, which is rotatably driven by a motor 50 about the rotation axis Y1. In another embodiment, not shown, the inventive method can also be applied with a Gewindef räser, which rotates about the horizontal axis in the figure X. In a still more preferred embodiment, both a non-illustrated threaded or Schneckenf räser, which operates approximately parallel to the workpiece, as well as a hob on a common module 5 is mounted between a first processing position and a second processing position to a can pivot any angle in a range to edit the same workpiece either or alternatively with the threaded and with the Wälzf räser.

Snails are milled like threads; In order to avoid unnecessary repetition, in this description and in the claims, the words Gewindef räser or thread used as a generic term, which also include Schneckenf räser or snails or similar toothed pieces. In addition, not only straight teeth, but also, for example, bevel gears can be machined with Wälzf räser in the context of the invention.

In the illustrated embodiment, which includes only one Wälzf räser, the tool motor 50 is mounted on the module 5, which is pivotable about the axis Z, so that the entire length of the workpiece can be edited. The axis Z is horizontal and orthogonal to the workpiece axis X.

The machine 1 comprises a first group of workpieces with a first workpiece 6 held between a first spindle 61 and a first counter-holder 62. Bn first workpiece motor 60, the first workpiece 6 rotate about the horizontal workpiece axis X.

The second group of workpieces is also present, which includes a second workpiece 7, a second spindle 71, a second counterholder 72 and a second workpiece motor 70. The second group is arranged coaxially with the first group, but the direction of the spindle and counter-holder are opposite. The second workpiece can be rotated by the second spindle about the workpiece axis X.

Both groups of workpieces are mounted on the same guide 53 on an inclined surface 10, and thus can be moved manually or preferably motor driven simultaneously linearly along the workpiece axis X. To keep the distance between the two groups, preferably the two groups only moved together; independent shifts are not possible. This also has the advantage that only a single actuator and a single command for the displacement of both groups are required.

The arrangement of both groups on an inclined surface 10 has, inter alia, the advantage that the base of the workpiece motors 60, 70 does not strike against the lower end of the hob 3 or against other parts on the module 5, in particular if the ends of the workpieces 6, 7 to be edited. The processing space remains more easily accessible than if the base of the motors 60, 70 were mounted approximately vertically.

In FIG. 1, the first group is located at a first group

Loading or unloading station D, at which the machined workpiece 6 unloaded and a new it workpiece can be loaded manually or automatically. The second group is, however, at a processing station E, where the second workpiece 7 is machined by the Verzahnungsf. The loading and unloading of a workpiece at the station D preferably takes place during the processing at the station E.

As already mentioned, after milling the workpiece 7, both groups can be moved linearly along the guide 53 at the same time to bring the first workpiece 6 loaded to the processing station Ezu and to bring the workpiece 7 processed at the same time to the second loading station F, where it discharges and can be replaced.

The gear cutting machine can be combined with an automatic loading and unloading device that either provides one of the two charging stations or both stations. Two independent loading and unloading devices can also be provided to supply the two processing stations independently.

The workpiece 6 can also move linearly in the direction X along the guide 53 relative to the module 5 during the milling process. The two workpiece motors 60 and 70 are disposed at opposite ends of the guide 53 so that they do not butt against the module 5 and that the entire length of the workpieces 6, 7 can be machined by the miller 3.

The tool motor 50, the workpiece motor 60 and preferably also motors for linear displacement of the tool and / or the workpieces 6, 7 along the various guides are preferably controlled by a program in a CNC unit. The CNC unit preferably operates the rotary drives and the linear drives synchronously, preferably at programmable speed and speed ratios, in order to be able to machine different types of gears and / or threads with the same machine. The present invention is particularly, but not exclusively, suitable for machining threads and gears up to module 2.5.

In the illustrated preferred embodiment, the

Rotary axes X and Y1 in each machining position always in a vertical plane (neglecting the small horizontal distance along Z). The tool motor 50 is thus never in a horizontal position orthogonal to the workpiece rotor 60, so that the depth of the machine 1 and the accessibility are improved.

The illustrated gear cutting machine has two charging stations and a processing station. Also possible are variants with more charging stations and / or more processing stations along one or more guides.

In addition to the possibilities of earning due to the use of the method according to the invention and the gear cutting machine according to the invention, data carriers with a software program for carrying out the method, which can be executed by data processing means in a milling machine (for example magnetic and / or optical media carriers), can also be marketed. [LIST OF REFERENCE NUMBERS

1 machine

10 Inclined avengers

3 hobs

5 swiveling module

50 tool motor

53 X leadership

54 Y leadership

6 First workpiece

60 First workpiece motor

61 First spindle

62 First, second opponent

7 second workpiece

70 Second workpiece motor

71 Second spindle

D First charging station

E processing station

F Second charging station. α angle

Claims

claims

1. gear cutting machine (1) with the following features:

a milling cutter (3) having a first axis of rotation (Y1),

- A first group with a first spindle (61) and a counter-holder (62) for rotatably driving a first workpiece (6) about a workpiece axis (X), characterized by

a second group having a second spindle (71) and an anvil (72) for rotatably driving a second workpiece (7) about the workpiece axis (X),

Guideways (53) parallel to said workpiece axis (X) for alternatively shifting said first group or said second group to a processing station (EE) where gears in said first and second workpiece (6, 7), respectively, of named cutter (3) can be gefast.

2. The gear cutting machine of claim 1, in which both named groups along the same guides (53) are linearly displaceable.

3. The gear cutting machine of claim 2, wherein both named groups along the same guides (53) are simultaneously linearly displaceable, and in which a workpiece (6, 7) in the group, or from the group, not at the designated processing station ( EE) is located, can be loaded or unloaded.

4. The gear cutting machine of claim 3, comprising an actuator for simultaneously linearly displacing both named groups along said guides (53).

5. The gear cutting machine according to one of claims 1 to 4, in which the said guides (53) allow a horizontal displacement of the groups.

6. The gear cutting machine according to one of claims 1 to 5, wherein the loading of a first workpiece (6) in the first group always takes place at a first loading station (D) and in which the loading of a second workpiece (7) in the second group always at one second charging station (F) takes place.

7. The gear cutting machine according to claim 6, wherein said processing station (E) intervenes between said first one

Charging station (D) and the designated second charging station (F) along the designated guides (53) is located.

8. The gear cutting machine gemässein one of claims 1 to

7, in which the named groups (60-62; 70-72) are arranged coaxially and in opposite directions and.

9. The gear machine gemässein one of claims 1 to

8, in which the named cutter (3) is a hob.

10. The gear machine gemässein one of claims 1 to

9, with a Gewindef Räser (2) to mill threads on the first or second workpiece.

11. Method for machining toothings on workpieces (6, 7), comprising the following method steps:

Machining a second workpiece (7) with a milling cutter at a machining station (E), and simultaneous loading of a new first workpiece (6) at a first loading station (D), wherein the second workpiece (7) is rotatably driven about a workpiece axis (X) linear displacement via guides (53) parallel to said workpiece axis (X) of the first and second workpieces (6, 7) until the second work piece (7) has a second loading station (F) and the first workpiece (6) has reached the named processing station (E),

Machining the first workpiece (6) with the named cutter (3) to the named processing station (E), and simultaneously discharging the second workpiece (7) and loading a new workpiece to the second loading station (F) wherein the first workpiece (6) the workpiece axis (X) is rotated.

12. data carrier in which a software program is stored, which can be executed by data processing means in a gear cutting machine (1) to perform the method of claim 11.