KR100847134B1 - Device and method for manufacture of cylindrical workpieces - Google Patents

Abstract

The present invention relates to an apparatus for producing a cylindrical workpiece 1 having a predetermined contour cross section. The apparatus comprises a workpiece holder 2 that is movable in the axial direction and intermittently rotates about the longitudinal axis Z and a forming tool 9; 12 which acts periodically on the workpiece. The device according to the invention is characterized in that it comprises at least one drive device 11 for intermittent rotation of the workpiece holder 2, which drive device for the forming tool 9; 8) and mechanically separated. The drive device 11 is connected to an electronic control device that controls an intermittent rotational motion dependent on the drive device 8 of the forming tool 9; 12. The present invention allows adjustment of any intermittent motion relative to the position and angle of the work piece 1, thereby enabling precise and particularly rapid machining of the work piece 1.

Impact Rolling Machine, Helical Teeth, Electronic Control, Intermittent Rotation

Description

Cylindrical workpiece manufacturing apparatus and manufacturing method {DEVICE AND METHOD FOR MANUFACTURE OF CYLINDRICAL WORKPIECES}

The invention relates to a device according to the preamble of claim 3 as well as to a method according to the preamble of claim 9.

Impact rolling machines are commonly used to cool form manufacture cylindrical workpieces with contours with toothed shapes. The movement of the tool, which means the machining movement, the direction and advance of the contour wheel or roller and the rotation of the workpiece, as well as the movement of the workpiece, which means axial advance with respect to the tool, correspond to the corresponding dimensions and precision. It must be geometrically harmonized with each other to obtain a predetermined contour with.

The machining and advancing operations of the workpiece as well as the tools can generally be continuous, which can be realized by combining these operations by mechanical or electronic drives. However, in order to create a predefined linear or helical tooth, the workpiece should ideally be discontinuously or intermittently rotated.

Such operation can be accomplished mechanically, for example by a gear box structure based on Maltese cross gearing. Such gear transmissions allow for the generation of discontinuous rotational movements starting from a continuous rotational drive. The respective rotational stages or division stages therefore depend on the gear ratio as well as the shape of the gear transmission. This means that the division steps to be performed must be defined and on this basis the gear train must be developed and configured. Such gear transmissions and thus manufacturing facilities are generally limited by the tooth number of the preselected workpiece.

This means that individual gear trains must be configured for different workpiece dimensions. This is relatively very complex and requires particularly high manufacturing costs and high equipment refurbishment costs.

It is an object of the present invention to provide an apparatus which makes it possible to simply adjust the splitting steps in rotating a workpiece, in particular for machining the workpiece with an impact rolling machine.

This object can be achieved by an apparatus according to the invention having the features as claimed in claim 1. Further preferred embodiments of the present invention are also obtained from the features of claims 2-6.

According to the present invention, an apparatus for manufacturing a cylindrical workpiece having a defined contour has a workpiece holder which is axially movable, which workpiece rotates intermittently about the longitudinal axis as well as forming tools that periodically act on the workpiece. It is possible and has at least one individual drive for the intermittent rotation of the workpiece holder mechanically separate from the drive of the forming tools. This individual drive is connected to an electronic controller connection, which controls the intermittent rotational movement as the molding tools are driven. Thus, the rotational position of the workpiece can be preferably adjusted depending on the movement or position of the forming tools, thereby producing a precise contour shape with respect to the contour of the full length of the workpiece. The position and duration of the workpiece to stop while the forming tool is in contact can be adjusted as intended.

For example, the contouring of the workpiece can be carried out at a significantly higher rotational speed than by a mechanical connection with a conventional drive. This remarkably high rotational speed can be obtained because the electronically controlled drive has much smaller mass inertia than the mechanical gear transmission for forming the intermittent rotational movement of the workpiece. Thus certain optimum parameters for the geometry of toothing can also be adjusted significantly faster. Thus, high production speeds can be achieved with low equipment and production costs.

Preferably, the forming tools are driven continuously in rotation along an adjustable trajectory so as to be parallel or at an angle to the longitudinal direction of the axis of the workpiece, preferably contoured wheels or rollers. Can be entered. Electronic control for intermittent rotation of the workpiece has proved to be particularly useful for the molding process used in impact rolling machines.

The workpiece holder is preferably supported by a guided headstock and is movable parallel to the workpiece axis and connected to the drive by means of an at least axially elastic coupling device. The drive remains free from the forces of the forming tools acting on the workpiece, and high forming forces can ensure accurate positioning or intermittent rotation. The drive is preferably located and guided in the second bearing and movable in parallel to the workpiece axis. The second bearing can thus be located in the same guide member which is the bearing of the workpiece holder or in a separate guide member facing parallel thereto.

Preferably, the periodic movement of the forming tools, the intermittent rotational movement of the workpiece holder and the axial advancement of the workpiece holder are made by separate drives, which are connected to each other electronically and preferably electronically controlled. Is connected to the device. Thus a wide variety of possibilities of movement can be obtained and the formation of complex contours is possible. Such devices are particularly suitable for forming contours or teeth that extend squarely with respect to the longitudinal axis.

The workpiece is preferably solid or hollow. The apparatus according to the invention can be suitably utilized for machining both hollow and solid parts. It is therefore possible to form teeth as well as external contour moldings or cavity parts as well as internal ones.

The hollow workpiece is preferably mounted on a cylindrical mandrel, which is preferably contoured and preferably has a contoured surface in the longitudinal direction.

The object achieved according to the invention also has the features of the method according to claim 7. Preferred embodiments can be obtained from the features of the further method claims 8 and 9.

According to the present invention, a method for forming a cylindrical workpiece having a defined contour with a forming tool which periodically acts on the workpiece, as well as a workpiece holder which is intermittently rotatable about the longitudinal axis and movable in the axial direction, comprises: It is characterized in that it is rotated or stopped about its longitudinal axis by a drive separate from the control and the forming tools. This is done according to the invention depending on the movement of the forming tools, which allows for a predefined defined contouring.

Preferably the control device imposes control on the workpiece as well as left and right turns. The desired contour shape can thus be obtained very accurately depending on the shape and movement of the forming tools.

The control device may preferably include control of the drives and control of the axial forward movement of the workpiece as well as the forward movement of the forming tools according to a preselected setting. Thus, the overall forming process for the contour of the cylindrical workpiece can be easily controlled and adapted to various workpieces. For example, it is not necessary to make new adjustments or conversions that require a lot of labor based on different division numbers for each gear transmission, various workpieces.

In addition, according to the invention, the utilization of the device according to the invention and the method according to the invention comprises the shaping of a helical tooth for a cylindrical workpiece.

1 is a longitudinal sectional view of a conventional processing apparatus having a gear transmission connected mechanically.

2 is a schematic longitudinal sectional view of the device according to the invention with a rotational drive of a workpiece connected electronically.

3 is a schematic front view of a workpiece coupled with a forming tool.

4 is a schematic longitudinal section showing the joining area of the forming tool to the workpiece according to FIG. 3;

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a longitudinal sectional view of a conventional impact rolling machine for the machining of a cylindrical workpiece 1.

The workpiece 1 is seated on the workpiece holder 2, which is capable of advancing into the machining region 3 along its z axis. Advancement is effected, for example, by a separate drive 4 which drives the spindle 6 via the gear train 5.

The forming tool 9, driven by the drive 8, is mechanically connected directly to the workpiece holder 2 via a Maltese cross gear transmission 7. Therefore, the intermittent rotation about the z axis of the workpiece holder 2 is directly connected or synchronized with the movement of the forming tool 9 according to the design of the Maltese cross gear transmission 7 and the gear ratio. Based on this configuration, the defined contour can now be machined by the forming tool 9 on the surface of the workpiece 1.

With such a configuration, only one contour with a specific contour or tooth number can be molded. For other dimensions, the gear ratio between the drive 8 and the workpiece holder 2 must be adjusted, which can only be achieved by replacing the corresponding gear or gear transmission parts. Such an exchange is time consuming and expensive.

A schematic longitudinal sectional view of the device according to the invention is shown in FIG. 2.

The configuration and drive of the machining zone 3 are consistent with the known configuration as shown in FIG. 1. The drive device 8 is effectively connected with the forming tool 9 by a mechanical gear device 10.

However, the workpiece holder 2 on which the workpiece 1 is mounted has its own drive 11. Advancement of the work piece 1 takes place via an individual drive 4 and a spindle 6 with a gear transmission 5, which drive device 11 also has a work piece 1 or a work holder 2. Move forward with).

The intermittent rotational motion of the workpiece holder 2 and the workpiece 1 and the synchronization between the forming tool 9 or the drive 8 are made by electronic control according to the invention. The drive device 8 as well as the drive device 8 preferably each have a corresponding position sensor.

On the other hand, the greatest advantage of electronic synchronization is that control can be made quickly, individually and easily according to the setting of contour segmentation without the need for intermediate intervention in the impact rolling machine. On the other hand, a moving sequence, which means a specific rotational pattern of the workpiece 1, can also be obtained, for example the impact of a helical tooth, which is not realized or costly by mechanical gear drive. Impact rolling is possible. In addition, the use of tools equipped with reversible coding or programs makes it possible to facilitate the adjustment of the device or the easy programming of the device control, thereby preventing substantially manual adjustment.

FIG. 3 schematically shows the front side of the work piece 1 which is connected by a forming tool in the form of a profile wheel 12. The contour wheel 12 is here shown as penetrating the surface of the workpiece 1 to its actual maximum penetration depth. According to the contour of the contour wheel 12, the contour of the workpiece surface is obtained, in particular at the interval t defined as contour division.

This region is completely shown in the longitudinal sectional view of FIG. 4, in which the contour wheel 12 is guided along a circular trajectory, so that the circle 13 represents the trajectory of the outermost region of the contour wheel 12. . On the other hand, the contour wheel of the advancement position 12 'at the moment of leaving the surface of the workpiece 1 is shown, in which the forming operation acting on the workpiece 1 is initiated and the contour wheel has just begun. The workpiece 1 must be stationary between these two positions in order to achieve the desired exact contour shape, while the workpiece 1 must be in its trajectory to contour the entire circumference. During the subsequent rotation of the contour wheel 12 to the center it has to be rotated by the interval t of the contour segmentation. With respect to this stationary state, in particular the position and duration of the workpiece stop, precisely by electronic synchronization with the individual drive in accordance with the invention. It can be obtained and can easily adapt to the number of teeth to be formed.

In particular, when forming such a contour on a hollow cylindrical sheet steel part, a high forming speed can be obtained according to a high rotational speed, and contour dimension adjustment can also be easily and quickly performed by the corresponding control. Preferably such adjustments can be carried out automatically by a chip coded tool, which runs the programs already included in the control without manual intervention.

In forming hollow parts, in particular with conventional apparatus, various high pressures had to be generated on the flanks of the contours by the rotation and advancement of the contour wheel 12 along the longitudinal axis of the workpiece. In the device according to the invention substantially this problem can be solved by means of an electronically synchronized and independent rotary drive which is correspondingly compensated for rotation about the longitudinal axis of the workpiece 1. It is expensive to achieve such results using a mechanical device, and even if such a result can be obtained, it is not complete.

Helical tooth shaping can also be realized by means of an impact rolling machine, for example, in accordance with the individually controllable intermittent rotation of the workpiece.

In addition, since the impact rolling machine can be utilized for pressure rolling by a pressure wheel by means of a drive electronically connected with the configuration according to the invention, the intermittent rotation of the workpiece is not necessary and the workpiece is predetermined and generally very high speed constant rotation. It is driven to rotate at speed. The retooling of the mechanical forming tool involved in the conventional apparatus can thus be avoided and can be easily adjusted and performed electronically by control. This makes it possible in the rolling process to first form a thin walled hollow part on a pressure mandrel from a disk and then to form a tooth in the hollow part on the same pressure madr.

Claims (26)

delete delete Cylindrical workpiece 1 having a determined contour, comprising a workpiece holder 2 that is movable in the axial direction and intermittently rotated about the longitudinal axis Z, and a forming tool 9 that periodically acts on the workpiece 1. In the manufacturing apparatus of A separate drive 11 is provided which is mechanically separated from the drive 8 of the forming tools 9, which is independent of the drive 8 of the forming tools 9. It is connected to the electronic control device for controlling the intermittent rotation of the workpiece holder (2), the workpiece holder (2) is supported in the guide headstock (20) to be guided and the longitudinal axis (Z) of the workpiece (1) Cylindrical workpiece manufacturing apparatus, characterized in that connected to the individual drive (11) by a connecting device (22) which is movable in parallel and elastically in the axial direction. The method of claim 3, The periodic movement of the forming tools 9; 12, the axial advancement of the workpiece holder 2 and the intermittent rotational movement of the workpiece holder 2 are made by individual drive devices 4; 8; 11, which drive devices Devices (4; 8; 11) are electronically connected to each other. The method according to claim 3 or 4, The workpiece (1) is a cylindrical workpiece manufacturing apparatus, characterized in that the cylindrical solid or hollow body. The method according to claim 3 or 4, Apparatus for producing a cylindrical workpiece, characterized in that the workpiece (1) is mounted on a cylindrical mandrel having one contour surface. delete delete Cylindrical workpiece 1 having a determined contour, comprising a workpiece holder 2 that is movable in the axial direction and intermittently rotated about the longitudinal axis Z, and a forming tool 9 that periodically acts on the workpiece 1. In the manufacturing method of), The work piece 1 is provided in the drive unit 11 and the electronic control device separated from the forming tools 9 independently of the movement of the shaping tools 9 for forming a predetermined contour shape on the work piece 1. Rotates or stops about the longitudinal axis Z, and the control device controls the axial forward movement of the work piece 1, the forward movement of the forming tools 9 and the drive device 8 according to a preselected setting. A cylindrical workpiece manufacturing method, characterized in that. delete The method of claim 3, The forming tools 9 are contoured wheels or rollers 12 which are driven to rotate continuously along the circular track 13, which is parallel or hard to the longitudinal axis Z of the workpiece 1. Cylindrical workpiece manufacturing apparatus, characterized in that the photograph. The method of claim 11, Cylindrical workpiece manufacturing apparatus, characterized in that the circular trajectory (13) is adjustable. The method of claim 4, wherein Apparatus for manufacturing a cylindrical workpiece, characterized in that the individual drive devices (4; 8; 11) are connected with an electronic control device. The method of claim 3, An individual drive (11) is a cylindrical workpiece manufacturing apparatus, characterized in that located in the guided second bearing (21), and movable in parallel to the longitudinal axis (Z) of the workpiece (1). The method of claim 3, The electronic control device is a cylindrical workpiece manufacturing apparatus characterized by controlling the axial forward movement of the workpiece (1), the forward movement of the forming tools (9) according to a preselected setting and the drive (8). The method according to any one of claims 11 to 15, The workpiece (1) is a cylindrical workpiece manufacturing apparatus, characterized in that the cylindrical solid or hollow body. The method of claim 5, The workpiece (1) is a cylindrical workpiece manufacturing apparatus, characterized in that mounted on a cylindrical mandrel having one contour surface. The method according to any one of claims 11 to 15, The workpiece (1) is a cylindrical workpiece manufacturing apparatus, characterized in that mounted on a cylindrical mandrel having one contour surface. The method of claim 16, The workpiece (1) is a cylindrical workpiece manufacturing apparatus, characterized in that mounted on a cylindrical mandrel having one contour surface. The method of claim 6, Cylindrical mandrel has a longitudinal contour surface in the cylindrical workpiece manufacturing apparatus. The method of claim 17, Cylindrical mandrel has a longitudinal contour surface in the cylindrical workpiece manufacturing apparatus. The method of claim 18, Cylindrical mandrel has a longitudinal contour surface in the cylindrical workpiece manufacturing apparatus. The method of claim 19, Cylindrical mandrel has a longitudinal contour surface in the cylindrical workpiece manufacturing apparatus. The method of claim 9, The workpiece holder 2 is supported by a guided headstock 20 and is driven individually by means of a connecting device 22 which is movable in parallel to the longitudinal axis Z of the workpiece 1 and which is axially elastic. A cylindrical workpiece manufacturing method, characterized in that connected with (11). The method according to claim 9 or 24, The control device is a cylindrical workpiece manufacturing method, characterized in that to impose the control of the left direction rotation and the right direction rotation and stop with respect to the workpiece (1). 10. The method of claim 9 wherein the determined contour is a helical tooth.

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