EP0371220B1 - Radial die-rolling machine - Google Patents

Abstract

The invention relates to a radial die-rolling machine in which the roll groove is formed by a radially acting die ring on the outside, a radially acting, fixed and non-displaceable arbor roll entering the workpiece from below, an axially acting arbor-roll plate which closes off the roll groove from below and an axially acting bevel roll which defines the roll groove from above and swings away radially and axially. The rolling plane is inclined. The loading and unloading is considerably facilitated. Since rolling plane, rolling slide guide, groove mounting and feed cylinder lie in one plane, optimum radial die rigidity results. Since the workpiece ejector and the arbor-roll mounting are arranged on one side, namely below the workpiece, the arbor roll can be constructed to be fixed and therefore need not be moved for loading and unloading. This likewise increases the rigidity in the roll groove and necessitates only one infeed axis. The distance between the fixed arbor roll and the receiving point for the workpiece blank is always the same. This permits unloading of the rolling machine by a simple swivelling mechanism. In addition, high annular parts (bushes) can be produced.

Description

The invention relates to a radial die-rolling machine with a rolling caliber which has a mandrel roller and a radially acting die ring which surrounds the workpiece and is driven by a motor and can be driven in a rotating manner.

Radial die rolling machines according to the prerequisite type are previously known. In the known radial die-rolling machines, the caliber is formed by a mandrel roller which engages in the workpiece from above and rotates in a motor-driven manner, a rotationally driven die ring and an ejector arranged below the workpiece, which delimits the rolling caliber with an ejector plate at the bottom, while the mandrel roller from above limits the rolling caliber with a mandrel roller plate. In this known construction, the mandrel roller can be adjusted radially and axially with respect to the workpiece in order to introduce the workpiece blank into the rolling caliber and, on the other hand, also to remove the finished rolled workpiece from the rolling caliber by the ejector, i.e. to load and unload the rolling caliber can.

The design effort in the known radial die rolling machines is considerable.

The invention is based on the object of designing a radial die-rolling machine of the superior type in such a way that the rigidity of the rolling caliber is increased, the loading and unloading of the rolling machine is simplified and the maintenance effort is reduced.

The object is achieved by the features set out in claim 1 .

• a) den radialwirkenden Gesenkring außen;
• b) die radialwirkende Dornwalze innen;
• c) den axialwirkenden Dornwalzenteller unten;
• d) die axialwirkende Kegelwalze oben.

In the invention, the rolling caliber is formed by:

• a) the radially acting die ring outside;
• b) the radially acting mandrel roller inside;
• c) the axially acting mandrel roller plate below;
• d) the axially acting tapered roller above.

Since the workpiece ejector and the mandrel roller bearing are mounted on one side, namely below the die ring, the mandrel roller can be stationary executed and therefore does not need to be moved during loading and unloading. This increases the rigidity in the rolling caliber and only makes one infeed axis (rolling slide) for the relative movement of the die ring across, e.g. B. at an obtuse angle to the mandrel roller.

Due to the stationary mandrel roller, the distance between the center of the mandrel roller and the pick-up point of the workpiece blank is always the same on a conveyor (conveyor belt) that is brought up to the side of the radial die-rolling machine. This enables the rolling machine to be loaded using a simple swivel mechanism.

In claim 2 , a very advantageous constructive solution is described. This achieves a high caliber stiffness. Another advantage is that the rolling plane, rolling slide guide, die ring bearing and any feed cylinder for the die ring can be arranged in one plane or practically in one plane, thereby achieving optimum rigidity.

Since the pivot axis of the rocker for the tapered roller is arranged inclined to the end face of the die ring, the tapered roller carries out a movement when the rocker is lifted by at least one cylinder or the like, which simultaneously leads away from the end face of the die ring in the radial and axial directions, around the To enable loading and unloading of the workpiece.

The inclined axis of the mandrel roller and taper roller to the roller plane creates a rolling motion on the workpiece, which reduces wear on the tools.

As far as the advantageous solution according to claim 3 is concerned, in this construction the loading of the rolling machine is possible by means of a simple swivel arm mechanism, since it only needs to move the workpiece between two fixed points, namely the pick-up point on the conveyor on which the workpiece blank is conveyed up and the center of the mandrel roller of the stationary mandrel roller. This eliminates the need for extensive adjustment work.

In the solution of the task according to claim 4 , a rocker is also arranged above the machine housing, which by at least one cylinder or another drive which alternately on both sides with pressure medium, for. As hydraulic oil, is to be pivoted about a pivot point fixedly attached to the machine housing. A support mandrel is rotatably mounted in the rocker and plunges into a bore in the mandrel roller. The rolling caliber is closed in the axial direction by a plate roller on the end face of the die ring. The axis of rotation of the support mandrel and plate roller are arranged inclined to the end face of the die ring. As with the mandrel roller, this results in a rolling motion on the workpiece, which causes wear on the Tools diminished. During the loading and unloading process of the radial die-rolling machine, the rocker with the support mandrel is pivoted away from the mandrel roller by the cylinder or another drive by applying pressure medium.

The particular advantage is that this solution can be used to produce high, ring-shaped parts (bushes). The bore of the workpiece blank can be as small as possible.

In solving the task according to claim 5 , the support mandrel is provided with a bore into which the extended part of the mandrel roller is immersed. This variant is chosen when the diameter of the mandrel roller becomes very small, for example only has a diameter of approximately 30 millimeters.

Fig. 1

eine Radial-Gesenkwalzmaschine teils im Schnitt, teils in der Ansicht;

Fig. 2

eine Seitenansicht einer Radial-Gesenkwalzmaschine gemäß der Erfindung;

Fig. 3

eine Draufsicht zu Fig. 2;

Fig. 4

eine Einzelheit aus Fig. 1 in vereinfachter Darstellung, teils im Schnitt, teils herausgebrochen dargestellt, in anderem Maßstab als die Darstellung in Fig. 1;

Fig. 5

eine Radial-Gesenkwalzmaschine in der Ansicht;

Fig. 6

eine Einzelheit aus Fig. 5 bei einer ersten Ausführungsform in vereinfachter Darstellung, teils im Schnitt, teils abgebrochen dargestellt, in anderem Maßstab als die Darstellung in Fig. 5 und

Fig. 7

eine weitere Ausführungsform in ähnlicher Darstellung wie in Fig. 6.

In the drawing, the invention is illustrated - partly schematically - using an exemplary embodiment. Show it:

Fig. 1

a radial die rolling machine partly in section, partly in view;

Fig. 2

a side view of a radial die rolling machine according to the invention;

Fig. 3

a plan view of Fig. 2;

Fig. 4

a detail of Figure 1 in a simplified representation, partly in section, partly broken out, on a different scale than the representation in Fig. 1.

Fig. 5

a radial die rolling machine in the view;

Fig. 6

5 in a first embodiment in a simplified representation, partly in section, partly broken off, on a different scale than the representation in FIGS. 5 and

Fig. 7

another embodiment in a similar representation as in FIG. 6.

A fixed mandrel roller 3, which is rotatably mounted about an axis 2, is arranged in a machine housing 1.

Above the machine housing 1, a roller carriage 4 is mounted in two guides 5 on both sides of the mandrel roller 3 in such a way that it has a feed movement can execute in the radial direction to the mandrel roller 3. A radially acting die ring 7, which can be rotated by an electric motor 6, is mounted in the roller carriage 4 such that the mandrel roller 3 is enclosed by the die ring 7.

A tapered roller 8 is also arranged on the roller carriage 4, the tapered surface lines 9 of which intersect on the axis of rotation 10 of the die ring 7. The tapered roller 8 is rotatably mounted in a rocker 11.

The reference numeral 12 denotes a pivot axis of the rocker 11. The pivot axis 12 is arranged inclined to the end face 13 of the die ring 7. This arrangement ensures that the tapered roller 8 executes a movement when lifting the rocker 11 by means of a cylinder 14, in particular hydraulically, which can be acted upon by pressure medium on both sides, which movement simultaneously leads away from the end face 13 of the die ring 7 in the radial and axial direction, or else leads, depending on which side of the cylinder 14 is acted upon by pressure medium pressure to enable the loading and unloading of the workpiece 15.

Also in the machine housing 1, a rotating, ring-shaped workpiece ejector 16 is arranged around the mandrel roller 3, the axis of rotation 17 of which lies parallel to the axis of rotation 10 of the die ring 7 and the speed of which corresponds to the speed of the die ring 7. The workpiece ejector 16 is provided with a lifting device 18, which moves the workpiece ejector 16 in the axial direction to the die ring 7. The lifting movement takes place when the roller carriage 4 has been moved into the position in which the axis of rotation 10 of the die ring 7 coincides with the axis of rotation 17 of the workpiece ejector 16.

It can be seen from the drawing that the rolling caliber is delimited at the top by the tapered roller 8, i. H. is closed, while it is limited from below by the mandrel roller 3 and the roller plate.

The workpiece blank 19 is introduced by means of a loading pivot arm 21 of a manipulator, which is rotatably mounted on the machine housing 1 in a pivot axis 20.

The workpiece blank 19 held on a continuous conveyor belt 22 by a metering device 23 is released when the rolling machine is ready to take up by opening the metering device 23 and transported into an open tongs 24. The workpiece blank 19 is clamped in the pliers 24 by pivoting a lever 25. The loading swivel arm 21 is rotated about the swivel axis 20 by a swivel drive 26 until the workpiece blank is placed over the stationary mandrel roller 3.

As can be seen in FIG. 1, the roller plane, roller slide guide, die ring bearing and feed cylinder are mounted approximately in one plane, whereby an optimum caliber rigidity is achieved.

Because the roller plane is inclined, gravity supports the unloading of the finished workpiece from the die ring.

The workpiece ejector 16 and the mandrel roller bearing are arranged from below with respect to the die ring 7. As a result, the mandrel roller 3 can be made stationary and therefore does not need to be moved during loading and unloading. As a result, considerable rigidity is achieved in the rolling caliber and only one feed axis is required for the rolling carriage 4. The longitudinal axis of the stationary mandrel roller 3 is always at the same distance from the manipulator. Since the mounting point for the workpiece blank 19 does not change with respect to the manipulator, the manipulator only needs to perform a simple pivoting movement between the mounting point for the workpiece blank 19 and the mandrel roller 3. It is therefore only necessary to have a structurally simple swivel mechanism.

It can be clearly seen from FIG. 4 that the rolling caliber is formed by the radially acting die ring 7 on the outside, the radially acting mandrel roller 3 on the inside, the axially acting mandrel roller plate at the bottom and the axially acting tapered roller 8 at the top. Through the inclined axis of mandrel roller 3 and taper roller 8 to the rolling plane produces a rolling motion on the workpiece 15, which reduces wear on the tools.

In the embodiments according to FIGS. 5 to 7, a rocker 102 is arranged above the machine housing 101 and can be pivoted about a pivot axis 105 which is fixedly attached to the machine housing 101 by means of a cylinder 104 or a plurality of such cylinders which is alternately pressurized with pressure medium pressure, in particular hydraulic oil. There are also other drives, e.g. B. linear drives, conceivable.

A support mandrel 106 is rotatably mounted in the rocker arm 102 and plunges into a bore of a mandrel roller 103.

A rolling caliber is closed in the axial direction by a plate roller 107 on an end face 108 of the radially acting die ring 110.

The axis of rotation 109 of the support mandrel 106 and the plate roller 107 is arranged inclined to the end face 108 of the die ring 110. As a result, as on the mandrel roller plate of the mandrel roller 103, a rolling movement on the workpiece 111 is achieved, which reduces wear on the tools. During the loading and unloading process of the radial die-rolling machine, the rocker 102 with the support mandrel 106 is pivoted away from the mandrel roller 103 by the cylinder 104 or another drive.

7 shows a further embodiment of the invention. In this embodiment, the support mandrel 106 is provided with a bore into which the extended part of the mandrel roller 103 is immersed. This embodiment is particularly useful when the diameter of the mandrel roller 103 is very small, e.g. B. is only about 30 millimeters.

Above the machine housing 101, a roller carriage (not specially marked) is mounted in two guides on both sides of the mandrel roller 103 in such a way that it can carry out a feed movement in the radial direction to the mandrel roller 103. The die ring 110, which can be rotated by an electric motor 112, is mounted in the roller carriage in such a way that the mandrel roller 103 is enclosed by the die ring 110.

The arrangement of the pivot axis 105 ensures that when or after the rocker 102 is lifted by the cylinder 104, it carries out a movement which at the same time leads or leads away from the end face 108 in the radial and axial directions, depending on which side of the cylinder 104 is acted upon by fluid pressure to enable loading and unloading of the workpiece 111.

Also in the machine housing 101, a rotating, ring-shaped workpiece ejector 114 is arranged around the mandrel roller 103, the axis of rotation 115 of which lies parallel to the axis of rotation 116 of the die ring 110 and whose speed coincides with the speed of the die ring 110. The workpiece ejector 114 is movable in the axial direction of the die ring 110. The lifting movement takes place when the rolling slide has been moved into the position in which the axis of rotation 116 of the die ring 110 coincides with the axis of rotation 115 of the workpiece ejector 114.

It can be seen from FIGS. 5 and 6 that in this embodiment the rolling caliber is closed by the plate roller 107 on the end face 108 of the die ring 110, while it is delimited from below by the mandrel roller 103 and its mandrel roller plate.

In the embodiment according to FIG. 7, the rolling caliber is delimited at the top by the mandrel roller plate of the support mandrel 106 and from below by the mandrel roller plate of the mandrel roller 103.

The workpiece blank is introduced by means of a loading pivot arm of a manipulator which is mounted on the machine housing 101 and is rotatable in a pivot axis.

The workpiece blank held on a continuous conveyor belt, also not shown, by a metering device is released when the rolling machine is ready to take up by opening the metering device and transported into an open tongs. By swiveling The workpiece blank is clamped in the pliers using a lever. The loading swivel arm is rotated about the swivel axis by a swivel drive until the workpiece blank is placed over the stationary mandrel roller 103.

The roller level, roller slide guide, die ring bearing and feed cylinder are mounted on approximately one level, which ensures optimum caliber rigidity.

Because the roller plane is inclined, gravity supports the unloading of the finished workpiece 111 from the die ring.

The workpiece ejector 114 and the mandrel roller bearing are arranged below with respect to the die ring 110. As a result, the mandrel roller 103 can be made stationary and therefore does not need to be moved during loading and unloading. This achieves considerable rigidity in the rolling caliber and only one feed axis is required for the rolling slide. The longitudinal axis of the stationary mandrel roller 103 is always at the same distance from the manipulator. Since the pick-up point for the workpiece blank does not change with respect to the manipulator, the manipulator only needs to perform a simple pivoting movement between the pick-up point for the workpiece blank and the mandrel roller 103. It is therefore only necessary to have a structurally simple swivel mechanism.

The inclined axis of the mandrel roller 103 and the support mandrel 106 to the roller plane results in a rolling movement on the workpiece 111, which reduces wear on the tools.

Reference list

1

Machine housing

2nd

Axis of the mandrel roller 3

3rd

Mandrel roller

4th

Rolling slide

5

Roll slide guide

6

Electric motor

7

Radial die ring

8th

Tapered roller

9

Cone surface lines

10th

Axis of rotation of the die ring 7

11

Swingarm

12th

Swing axis of the rocker 11

13

Face of the die ring 7

14

cylinder

15

workpiece

16

Workpiece ejector

17th

Rotation axis of the workpiece ejector 16

18th

Lifting device

19th

Workpiece blank

20th

Swivel axis of the loading swivel arm 21

21

Loading swivel arm

22

Conveyor belt

23

Allocation facility

24th

Pliers

25th

lever

26

Swivel drive for loading swivel arm

101

Machine housing

102

Swingarm

103

Mandrel roller

104

cylinder

105

Swing arm pivot axis

106

Support mandrel

107

Plate roller

108

Face of the die ring 110

109

Axis of rotation of the support mandrel 106

110

Radial die ring

111

workpiece

112

Electric motor

113

-

114

Workpiece ejector

115

Rotation axis of the workpiece ejector 114

116

Axis of rotation of the die ring 110

bibliography

DE-PS 36 20 65
DE-PS 36 20 66
DE-OS 29 23 001
U.S. Patent 3,626,564
U.S. Patent 1,745,514

Claims (5)

1. Closed die rolling machine with a groove which is fitted with a mandrel roll (3) and a rotating die ring (7) which is powered by a motor and which encloses the workpiece (15) from the outside, characterized by the fact that:

   a) the stationary mandrel roll (3) engages the workpiece (15) from beneath,

   b) which causes the groove to be closed from above by a motor-powered tapered roll (8) acting axially, and from below by a mandrel buffer plate which is connected with the mandrel roll (3).

   c) the cone surface lines (9) of the tapered roll (8) are cut on the axis of rotation (10) of the closed die (7),

   d) the closed die (7) can be moved perpendicularly to the mandrel roll (3),

   e) the tapered roll (8) is mounted on rotating bearings on a rocker (11) and the pivoting axis of the rocker (11) is inclined at an angle to the upper end surface (13) of the closed die (7), and the rocker (11) with the conical roll (8) can be pivoted away radially and axially from the upper end surface of the closed die (7) to allow the groove to be opened,

   f) the axis of rotation of the mandrel roll (3) is positioned at an obtuse angle and the axis of rotation of the conical roll (8) at an acute angle to the rolling plane (13) of the closed die

   g) the rolling plane (13) is inclined at an angle to the horizontal.
2. Closed die-rolling machine as described under claim no. 1 above, characterized by the fact that the rolling plane (13), rolling carriage guide, groove bearings and forward feed cylinder are arranged at a single level, or approximately one single level, in order to increase the rigidity of the closed die.
3. Closed die-rolling machine as described under claim no. 1 and/or claim no. 2 above, characterized by the fact that the distance between the centre of the mandrel roll and the locating point of the rough workpiece (19) is always equal, and that the rolling machine can be loaded by means of a simple pivoting mechanism.
4. Closed die rolling machine with a groove which is fitted with a mandrel roll (103) and a rotating die ring which is powered by a motor and which encloses the workpiece (111) from the outside, characterized by the fact that the stationary mandrel roll (103) engages the workpiece (111) from beneath and the groove is closed from above by a plate roll (107) acting axially, and from below by a mandrel buffer plate which is connected with the mandrel roll (103), and the closed die (110) can be moved perpendicularly to the mandrel roll (103), the plate roll (107) closing the groove from above is mounted on rotating bearings on a rocker (102) and the pivoting axis of the rocker (105) is inclined at an angle to the upper end surface (108) of the closed die (110), and the rocker (102) with the roll can be pivoted away radially and axially from the upper end surface (108) of the closed die (110) to allow the groove to be opened, and the axis of rotation of the mandrel roll (103) and the roll which closes the groove from above is positioned at an obtuse angle to the end surface of the closed die and the rolling plane is also inclined at an angle to the horizontal plane, whereby:

   a) a rocker (102) which is mounted above on a machine housing (101), can be pivoted back and forth around a stationary axis (105) mounted on the machine housing by at least one cylinder and piston unit (104) which is subject to alternating pressure by a pressure medium or another source of power e.g. a linear drive system, and which can be locked in any position required;

   b) a supporting mandrel (106) is mounted on rotating bearings in the rocker and plunges into a hole in the mandrel roll (103, fig. 6);

   c) in the axial direction, the rolling groove is connected to the end surface (108) of the closed die (110) by a plate roll (107; fig. 6);

   d) the axis of rotation (109) of the support mandrel (106) and the plate roll (107) are positioned at an angle to the end surface (108) of the closed die (110);

   e) during loading and unloading of the closed die rolling machine, the rocker (102) with the support mandrel (106) can be pivoted away from the mandrel roll (103) by the piston and cylinder unit (104) or another type of power system
5. Closed die rolling machine with a groove which is fitted with a mandrel roll (103) and a rotating die ring which is powered by a motor and which encloses the workpiece (111) from the outside, characterized by the fact that the stationary mandrel roll (103) engages the workpiece (111) from beneath and that the groove is closed from above by a roll (107) acting axially, and from below by a mandrel buffer plate which is connected with the mandrel roll (103), and the closed die (110) can be moved perpendicularly to the mandrel roll (103), the plate roll (107) closing the groove from above is mounted on rotating bearings on a rocker (102) and the pivoting axis of the rocker (105) is inclined at an angle to the upper end surface (108) of the closed die (110), and the rocker (102) with the roll can be pivoted away radially and axially from the upper end surface (108) of the closed die (110) to allow the groove to be opened, and the axis of rotation of the mandrel roll (103) and the roll which closes the groove from above is positioned at an obtuse angle to the end surface of the closed die and the rolling plane is also inclined at an angle to the horizontal plane, whereby:

   a) a rocker (102) which is mounted above the machine housing (101), can be pivoted back and forth around a stationary axis (105) mounted on the machine housing by at least one cylinder and piston unit (104) which is subject to alternating pressure by a pressure medium or another source of power, and which can be locked in any position required;

   b) a supporting mandrel (106) is mounted on rotating bearings in the rocker (102) and possesses a bore into which an extended part of the mandrel roll (103, fig. 6) plunges;

   c) in the axial direction, the rolling groove is connected to the end surface (108) of the closed die (110) by a plate roll (107);

   d) the axis of rotation (109) of the support mandrel (106) and the plate roll (107) are positioned at an angle to the end surface (108) of the closed die (110);

   e) during loading and unloading of the closed die rolling machine, the rocker (102) with the support mandrel (106) can be pivoted away from the mandrel roll (103) by the piston and cylinder unit (104) or another type of power system.

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