JPS5914284B2 - Extrusion press mandrel cleaning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mandrel cleaning device for an extrusion press.

A container for storing a billet, a pressure stem for pressurizing the billet in the container toward the die, and a mandrel etc. fitted inside the pressure stem so as to be relatively slidable in the axial direction. There is an extrusion press that extrudes a hollow extruded material while controlling its shape.

In this type of extrusion press, since a considerable amount of metal shell adheres to the mandrel, it is necessary to clean the mandrel once every several to ten or so presses.

However, conventionally billet supply - piercing - extrusion -
Cutting - discard, dummy block handling, etc.
Although the sequence of operating elements required for each cycle of extrusion has moved toward automation, cleaning operations of this type, which are not required for each cycle, are still dependent on the manual labor of an operator.

This not only imposes a workload on the operator, but also causes variations in work, and also poses a safety problem since it requires the operator to enter the press.

In addition, conventionally, a jig with a split flange was used.
After gripping the mandrel with the flange of the jig, the mandrel itself moved to remove the shell, but due to the nature of the shell, the flange opened and the shell could not be completely removed. This had a significant impact on the quality improvement chain.

In view of these conventional problems, the present invention provides a mandrel cleaning device that streamlines the mandrel cleaning work, saves labor, and enables uniform cleaning. The point is that it is equipped with a rotation drive device that rotates the mandrel around its axis, a grinder device that grinds the tip portion at the tip of the mandrel, and a moving device that moves the grinder device in the distance direction with respect to the mandrel. The second feature is a rotary drive device that rotates the mandrel around its axis, a grinder device that grinds the tip at the tip of the mandrel, and a mandrel that is slidably fitted onto the mandrel in the axial direction. The invention includes a scalping ring, a bank-up device for backing up the scalping ring, and a moving device for moving the grinder device and the bank-up device in the far and near directions with respect to the mandrel.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
In the figures and FIG. 2, 1 is a press platen, which has a through hole 2 at the center of the press.

A main cylinder frame 3 is connected to the press platen 1 by a plurality of columns 4, and the press platen 1 and the main cylinder frame 3 are installed on a press bed.

5 is a die stem guide body attached to the press platen 1, and 6 is a long cylindrical die stem, which can be moved and fixed freely between the center of the press and the outside of the press by the die stem guide body 5 via a die stem slide 7. Supported.

8 is an intermediate frame, which is movable along the press bed 10 by a moving cylinder 11;
A guide ring 12 which is slidably fitted onto the die stem 6 located at the center of the press is provided via a guide slide 13, and a shearing device 14 is also provided.

The shear device 14 includes a shear 15 and a shear ring 16 that drives the shear in a direction perpendicular to the pressing direction.

17 is a die ring fitted to the tip of the die stem 6,
This allows the die 18 to be attached.

A main cylinder 19 is attached to the main cylinder frame 3, and a main ram 20 is slidably fitted into the main cylinder 19.

A crosshead 21 and a pressure stem 22 are provided at the tip of the main ram 20, and the crosshead 21 is connected to a side cylinder 2 provided between the main cylinder frame 3 and the main ram 20.
It can be driven by 3.

A mandrel piston 24 is slidably fitted into the main ram 20, and a mandrel 26 is connected to the mandrel piston 24 via a mandrel holder 25.
The mandrel 26 is slidable in the axial direction relative to the pressurizing stem 22.

Reference numeral 27 denotes a container, which has an accommodation hole 29 for accommodating the billet 28 at the center of the press, is attached to the press platen 2 via a container holder 30, and is movable in the press direction by a container moving device consisting of a container cylinder 32 and a piston 31. be.

A hydraulic cup cylinder 33 is attached to the black head 21, and its piston is coupled to the container holder 30.

34 is a mandrel locking device, and tail rod 35
The mandrel locking device 34 is attached to the main cylinder 19 via a mandrel cushion cylinder 38.

Reference numeral 39 denotes a rotation drive device for rotating the mandrel 26 around its axis, which engages with the worm 40 rotatably inserted into the crosshead 21 and is slidable relative to the mandrel holder 25 in the axial direction. The worm wheel 42 is connected to a key 41, and the worm 40 is driven by an electric motor (not shown), or a hydraulic or pneumatic motor.

43 is a grinder device for grinding the tip portion 44 at the tip of the mandrel 26, and as shown in FIGS. 3 and 4, it consists of a grinder 45 and a drive device 46 such as an electric motor, hydraulic pressure, or pneumatic motor for driving the grinder 45. This grinder device 43 consists of a grinder arm 47 and a support shaft 48.
is supported by the bracket 50 of the vibrating arm 49 via
And it is made to swing by the grinder cylinder 51.

Reference numeral 52 denotes a scalping ring, which is fitted onto the shaft of the mandrel 26 so as to be able to slide freely in the axial direction, and which is attached to the pressure stem 2.
It can be accommodated within 2.

Reference numeral 53 denotes a backup device for backing up the scalping ring 52, which has a pair of backup plates 55 pivotally supported on the swing arm 49 by a support shaft 54, and gears 56 that mesh with each other are fixed to each support shaft 54. , and a backup cylinder 57 is connected to one of the backup plates 55.

Therefore, the backup plate 55 can be opened and closed by expanding and contracting the backup cylinder 57.

The swing arm 49 is pivotally supported by a support frame 58 attached to the column 4 on a pivot shaft 59.
9, the grinder device 43 and the backup device 53 can freely swing between the center of the press and the outside of the press in a direction orthogonal to the press direction.

A swing cylinder 60 swings the swing arm 49, and is attached to the support frame 58 via a bracket 61.

Note that 62 is a piston of the swing cylinder 60.

63 is a dummy block. FIG. 5 shows the cleaning control system, 64 is a detector that detects the extrusion operation by the operation of the main cylinder 4, etc., 65 is a preset counter that counts the number of extrusions, and this includes the number of extrusions that require cleaning. Preset.

A cleaning control circuit 66 is configured to control the swing cylinder 60, grinder cylinder 51, and backup cylinder 57 at appropriate timings.

In the extrusion press having the above configuration, the operation when indirectly extruding the hollow extruded material A will be explained.

First, a billet 28 made of aluminum or the like and a dummy block 63 are accommodated in the cavity 29 of the container 27, and the pressurized stem 22 is
is moved in the direction of arrow a to fill the housing hole 29 with the billet 28, then hydraulic oil is supplied to the mandrel piston 24, and the billet 28 is pierced by moving the mandrel 26 in the direction of arrow a.

Then, with the tip portion 44 of the mandrel 26 facing the hole of the die 18, the mandrel 26 is locked by the mandrel locking device 34.

Next, the crosshead 21 and the container 27 are integrally fed by the hydraulic coupling cylinder 33, and hydraulic oil is supplied to the main ram 20 and the container cylinder 32, so that the pressurizing stem 2
When the billet 28 and the container 27 are integrally moved in the direction of the arrow a and the billet 28 is pressed toward the die 18 side by the pressure stem 22, the die 18 and the mandrel 2 are moved together as shown in FIG.
A hollow extruded material A corresponding to the gap between the die stem 6 and the through hole 2 is extruded and sequentially extruded in the direction indicated by the arrow a through the die stem 6 and the through hole 2.

When the extrusion is completed, the cross head 3, container 27, etc. are moved in the direction of arrow A, and then the intermediate frame 8 is moved to the end side of the die stem 6, and the discard protruding from the die 18 is moved by the shear device 14. Cutting ends the series of extrusion cycles.

Such an extrusion operation is detected by a detector 64 and sequentially counted by a preset counter 65.

When the number of extrusions reaches the preset number, the cleaning control circuit 6 receives an output from the preset counter 65.
6 works, and the cleaning work of the mandrel 26 begins as follows.

That is, since the swinging arm 49 is at the outside position of the press as shown by the imaginary line in FIG. 2 during extrusion, the swinging cylinder 60 is first extended to swing around the pivot shaft 59 in the direction indicated by the arrow b. Then, the grinder device 43 and backup device 53 are moved toward the center of the press.

Next, the backup cylinder 57 is extended, each backup plate 55 is swung around the support shaft 54 as shown in FIG. 7, and the scalping ring 52 on the mandrel 26 is clamped. The mandrel 26 is moved in the direction indicated by the arrow a.

Then, since the scalping ring 52 is regulated by the pressure stem 22 via the bank up plate 55, when the mandrel 26 is moved, the scalping ring 52 pushes the shell B on the shaft of the mandrel 26 as shown in FIG. It can be handled easily.

Thereafter, the backup cylinder 57 is contracted to open the backup plate 55.

Next, the rotary drive device 39 rotates the mandrel 26 around its axis, and the drive device 46 causes the grinder 4 to rotate.
5 is rotated around the axis, the grinder arm 47 is swung by the extension operation of the grinder cylinder 51, and the grinder 45 is rotated around the mandrel 2 as shown in FIG.
6, and polish and clean the tip portion 44 with the grinder 45.

In this case, pressing the grinder 45 against the mandrel 26 is extremely important in order to cope with changes in the diameter of the mandrel 26, wear of the grinder 45, and the like.

When the cleaning is completed, the swing cylinder 60 is contracted, and the grinder device 43 and bank up device 5 are
3 to the outside of the press as shown by the imaginary line in FIG.

In the embodiment, skull pinking and grinding are performed at the same time, but they do not need to be performed at the same time, and may be performed alternately every few cycles.
In addition, it may be a separate piece of equipment.

Furthermore, although the indirect extrusion type was used in the examples, the present invention is not limited to this, and the same method can be implemented even if a direct extrusion type is used.

Further, the number of repetitions of the normal cycle of the extrusion press is counted with a counter, and when the number reaches a preset number, the skull pink device and/or the grinding device are activated,
After the mandrel cleaning operation is completed, the counter is returned to O again to continue the extrusion press cycle, and the mandrel cleaning operation is automatically activated once every several extrusion cycles according to operator settings. You can also do this.

As described in detail in the embodiments above, in the present invention, the tip portion of the tip of the mandrel is polished by a grinder device while the mandrel is rotated around its axis by a rotary drive device, and the grinder device is rotated by a moving device. Since it can move near and far from the mandrel, compared to conventional mandrel cleaning work, the operator's workload is reduced, work variation is reduced, safety during work is improved, and product quality is improved. will improve.

In addition, a scalping ring is fitted onto the mandrel, and this is clamped with a backup device, so
By moving the mandrel, the scalping ring can handle the mandrel shell.
This further improves the quality of the product.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is an overall cross-sectional view, FIG. 2 is an enlarged view taken from the ■-■ arrow in FIG. 1, and FIG. 3 is an enlarged view taken from the ■-■ arrow in FIG. 2. Figure 4 is a view from the IV-IV arrow in Figure 3,
Figure 5 is a block diagram of the control system, Figure 6 is a sectional view showing the extrusion state, Figure 7 is a sectional view showing the clamping operation, Figure 8 is a sectional view showing the skull pink operation, and Figure 9 is the cleaning operation. FIG. 1...Press platen, 3...Main cylinder frame, 6...Die stem, 14...
... Shearing device, 18 ... Gui, 19
...Main cylinder, 20...Main ram, 2
2... Pressure stem, 24... Mandrel piston, 26... Mandrel, 27...
... Container, 28 ... Billet, 39 ...
... Rotation drive device, 43 ... Grinder device, 44 ... Chip section, 45 ... Grinder, 52 ... Scalping ring, 53 ...
...Backup device, 62...Movement device.

Claims (1)

[Claims] 1. A pressurizing stem that presses the billet in the container toward the die side is provided, and a mandrel that determines the internal shape of the hollow extruded material is provided within the pressurizing stem so as to be relatively movable in the axial direction. A mandrel cleaning device for an extrusion press includes a rotational drive device that rotates the mandrel about its axis, a grinder device that blinds the tip portion of the tip of the mandrel, and a movement that moves the grinder device in a distance direction relative to the mandrel. A mandrel cleaning device for an extrusion press, characterized in that it is equipped with a device. 2. Mandrel cleaning of an extrusion press that is equipped with a pressure stem that presses the billet in the container toward the die side, and a mandrel that determines the internal shape of the hollow extruded material is provided within the pressure stem so as to be relatively movable in the axial direction. The apparatus includes: a rotary drive device that rotates the mandrel about its axis; a grinder device that bridles a tip at the tip of the mandrel; a scalping ring that is fitted on the mandrel so as to be slidable in the axial direction; A mandrel cleaning device for an extrusion press, characterized by comprising a backup device for backing up a pink ring, and a moving device for moving a grinder device and a back amplifier device in a direction near and far from the mandrel.