JPS5929331B2 - Hollow profile extrusion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for removing metals, in particular from light metals, with at least one mandrel head in the mandrel carrier that projects into the master mold opening of the tool.
The present invention relates to an apparatus for extruding hollow or partially hollow profiles.

Such a device is, for example, covered by German Utility Model No. 7412.
No. 358 discloses a mandrel head formed from a mandrel disk attached to a mandrel neck.

The mandrel head has its end in an opening bounded by the master formwork and together with its ends forms the geometric boundary for the finished profile.

However, such a break-through of the core metal disk
The mandrel neck and alignment head, which are integrally fixed to the root which determines the mandrel neck (hlong), create an excessive effective cutting stress between the mandrel neck and the root, so this tool requires the use of expensive materials. Even so, the disadvantage of destruction after a short insertion time is recognized.

Such fractures are commonly installed in presses of light metal alloys that are difficult to press.

Occurs in tools with dog mandrels and the like.

A known possibility to suppress the occurrence of the above-mentioned notch effect is to include a curve that passes appropriately between the mandrel neck and the root; Since the transition between the two is processed three-dimensionally, this has been a difficult solution that is subject to very strict limitations and requires a lot of cost.

Therefore, according to the present invention, the following idea was introduced in order to eliminate the above-mentioned drawbacks of the tool whose outline was explained at the beginning.

That is, by accommodating the tensile forces in the mandrel, the planar loads on the mandrel carrier, and the resulting bending stresses together by the mandrel carrier itself, the conventional design for hollow and semi-hollow profiles is achieved. The aim is to achieve division of the resultant stress in the process and reduction of stress concentration at the base of the notch during transition to the mandrel carrier.

This is achieved by a mandrel configured as a special insert piece, which is held by a connecting mechanism by means of a mandrel carrier that at least partially reinforces the opening of the master mold.

Therefore, in a press tool configured in this way, the mandrel carrier or mandrel disk consisting of the root, the mandrel neck, and the mandrel head is not made of one piece, but is made of a carrier portion having the root. Unlike conventional tools, the high notch stress at the transition point between the mandrel neck and the root, which occurs in the case of monolithic construction, is is removed.

A threaded connection using a screw made of high-strength material for fixing the mandrel to the mandrel carrier on a disk has proven particularly advantageous as the coupling mechanism.

According to another feature of the invention, the screw is mounted in the area of a hole in the mandrel disk, preferably oriented parallel to the main axis of the tool or to the pressing direction, so that it can be released if necessary.

The hole is provided through the hole in order to suppress the additional cutting stress and is preferably provided with an additional cover to prevent the press material from entering the hole. It is possible to close the application by

Therefore, it is sufficient to design it as the above-mentioned screw pin screw, so that only the tensile forces acting on the mandrel can be accommodated therein.

In order to prevent the pressing material from leaking into the lateral seam between the mandrel and the mandrel disc, a resiliently acting seam weld can be applied around the seating area of the mandrel.

However, since the horizontal seam is located on the side of the mandrel disc that is far from the side into which the press material flows, the leakage phenomenon described above rarely occurs.

Rotation of the mandrel attached to the mandrel disc when a single central threaded connection is made is eliminated according to the invention by providing a hole in the mandrel disc which allows the insertion of the mandrel. Can be done.

Alternatively, the restraining member of the mandrel could be engaged with a counter member of the mandrel disk, but such additional safety devices are not found to be necessary, especially during normal press operation.

Next, the operation and effects of the present invention will be explained in more detail with reference to the drawings showing the implementation side of the present invention.

A square block mandrel 3 is provided in the center of a cylindrical tool consisting of a master plate 1 and a mandrel disc 2 for extrusion molding a single-chamber hollow profile. It is releasably fixed by a pin screw 4S made of melted high-strength martensitic special steel made of 18Ni-Co-Mo and a nut 5, and plunges into the central hole 30 of the mother plate 1. There is.

The pin screw 4S is inserted into a screw hole 6S provided in the center root 7 of each breakthrough portion 20 of the core metal disk 2, and the screw hole 6S is inserted into the screw hole 6S to prevent cutting stress from being applied.
The mandrel disk 2 is constructed in a through-through manner and is closed on the side 9 of the mandrel disk 2 remote from the mandrel by a cover plate 10 .

This cover plate prevents the processed material from entering the screw hole 6S.

A transverse groove 11 formed in the transverse direction separates the mandrel 3 from the upper surface of the root 7, the mandrel 3 being fitted within the frame-shaped recess 12 created by the rear step and its Rotation is blocked.

In order to prevent the press material from leaking into the transverse groove 11, an elastic welded seam is provided around the seat of the mandrel 3.

In the tool A1 according to FIGS. 3 and 4, the master plate 1 and the mandrel disk 2 are surrounded by a master mold holder 15 in mutual engagement by means of edges shoulders 14. In the tool A1 according to FIGS.

In addition, the round mandrel 30 of this tool A1 has a head screw 4.
This tool A, which is fixed to the mandrel disk 2 by means of a connecting screw consisting of a and a nut 5, is placed in the assembled state in a tool holder of an extrusion press, which is not shown in detail in the drawing.

This is supported by a support 16.

During further pressing, the container 18 containing the press bolt or press block is placed on the mandrel disk 2 or on the matrix holding device 15.

In the embodiment described above, the screw head 40 protects the hole 6 against the press material.

A pin 21 protruding from the underside of the mandrel engages in a blind hole 23 in the mandrel disk 2 as an additional rotation stop.

In the tool B of FIGS. 5 and 6, the two headed screws 4, which are provided on both sides of the main axis N of the tool and pass through the holes 6, are centered between the six breakthrough parts 200. It also holds a sectioned block mandrel 3b.

Although the tool B is not shown in more detail, four or more screws 4 may be provided to the block core 3b in some cases.

Corresponding to the embodiment shown in the detailed view appearing to the side of the plan view shown in FIG. It has been found that the division into several core pieces 3I to 3■ is particularly advantageous for reasons of strength already mentioned.

In this case, the mandrel pieces 31 to 32 can be tightened together by means of a notched spring continuation device 19 on the front side.

The mandrel 3 of the tool C shown in FIGS. 7 and 8, which is made into a regular triangle in plan view, is also individually threaded through the head screws 4, and thereby the mandrel becomes circular. fixed to the board.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the mandrel disk of the press tool as seen in the direction of the arrow ■ in Fig. 2, and Fig. 2 is a plan view taken along the line ■-■ in Fig. 1.
Figure 3 is a cross-sectional view of the core metal disk on which the master plate is placed.
A plan view schematically showing the bottom and top surfaces of another press tool, FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a mandrel held by two screws. FIG. 6 is a sectional view taken along the line ■--■ in FIG. 5, and FIG. , and a diagram corresponding to FIG. 5, and FIG. 8 is a cross-sectional view along the line layer-to-layer of FIG. 7. In the figure, 1...mother plate, 2...core metal disk, 2°...breakthrough part, 3.3o, 3b, 3c, J3
■-Block core, 4 H4a * 4 s...screw, 5... nut, 6.6s... screw hole, 7... root, 8... root top surface, 9... disc side far from the mandrel, 11...transverse groove, 12...recessed part, 13...
- Welded seam portion, 15... Edge step, 16... Support tool, 17... Press block, 18... Receiving portion, 1
9...Groove/spring joint part, 21...Pin, 23...
Blind hole.

Claims (1)

[Scope of Claims] 1. In an apparatus for extruding hollow or partially hollow profiles, in particular from light metals, with at least one mandrel surface in the mandrel carrier that protrudes into the master mold opening of the tool. , the mandrel surface is configured as a special bayonet mandrel 3 and the master mold opening 30 is closed by at least one coupling mechanism 4 (
Apparatus for extruding hollow profiles, characterized in that both are held in a mandrel carrier 2 which is partially reinforced.