DE2045841A1 - Finishing pre-formed aperture in extrusion tool - Google Patents

Abstract

Finishing an opening in an extrusion tool consists of mounting the tool in a holder and forcing an abrasive compound through the tool in the required extrusion direction. As it passes through the tool opening the compound abrades the side wall and the abrasion process is continued until the desired finish is achieved. Pref. the tool holder is positioned at one end of a cylinder containing a ram which forces the compound through the tool in a manner which simulates the extrusion process, i.e. the compound being extruded into a free space in to which it is not confined. Used in the extrusion of aluminium sections or for de-burring drilled passages in metal components. The apparatus eliminates the need for the usual hand finishing, providing a more uniform and accurate finishing without the use of skilled labour. - US3886697 A Finishing an opening in an extrusion tool consists of mounting the tool in a holder and forcing an abrasive compound through the tool in the required extrusion direction. As it passes through the tool opening the compound abrades the side wall and the abrasion process is continued until the desired finish is achieved. Pref. the tool holder is positioned at one end of a cylinder containing a ram which forces the compound through the tool in a manner which simulates the extrusion process, i.e. the compound being extruded into a free space in to which it is not confined. Used in the extrusion of aluminium sections or for de-burring drilled passages in metal components. The apparatus eliminates the need for the usual hand finishing, providing a more uniform and accurate finishing without the use of skilled labour.

Description

Patent attorneys
Dr. Ing.H. Negendank

Dipl. Ing-H. Hauck

Dipl. Phys. W. Schmitz

8MUnchen15 _f Mocarfstr. 23

Tel. 5380686

Edward George Field Camp

\ 60 Robert Burns Avenue September 15, 1970

Benhall, Cheltenham, England Attorney File M-I328

Process for the surface treatment of metal parts

The invention relates to a method and a device for surface treatment a prefabricated opening of a component consisting of a hard material, preferably metal, in particular ; Special an extrusion tool or an extrusion mold, as • they are used in the extrusion of aluminum parts.

In the production of extrusion tools it is nowadays common

lent to prefabricate the extrusion die in the spark erosion process ; run; after the heat treatment, which the extrusion die the necessary Gives hardness, the wall of the opening of the extrusion ■ Tool finished by hand, using small files and emery cloth. Although this removes the through

The "etched" surface left behind by the spark erosion, however, requires considerable skill and great care if the shape of the opening is to remain unchanged and the quality of the extrusion tool is not to be impaired by the fact that the

sloping sections of the side wall given a wrong incline ! will. The quality of the finished extrusion tool is

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by a steady speed at which the metal during of the extrusion process flows through the opening, determined, and the Speed of metal flow at a given point largely depends on the inclination of the adjacent parts of the side wall away. Hand finishing, therefore, requires great skill and if done poorly it may be necessary the extrusion tool will be discarded.

The object of the invention is to provide a method and an apparatus for Specify surface treatment that allow a more uniform and more precise surface treatment without specially trained Skilled workers are required.

This is achieved by the features specified in claims 1 and 6, respectively.

In the method according to the invention, this is carried through the opening dejs to be machined component, pressed abrasive the side wall of the ' opening, and the abrasion process is continued until the desired surface properties are achieved. i

The abrasive can be a liquid, paste or solid! Be a wax suspension of abrasive particles. The abrasive can, for example, have abrasive particles, such as silicon carbide, which are shown in FIG a so-called "tooth wax" (i.e. wax used in making dental impressions).

In the method according to the invention, the surface is removed uniformly distributed over the opening, so that the accuracy of the

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prefabricated form is not affected. The tool holder, 'in which the extrusion die is held, is preferably arranged at one end of a cylinder which contains a punch. The punch presses the abrasive through the opening of the material to be processed Component, in a manner that is similar to the extrusion process. Abrasives of different degrees of punity can be used can be used for rough and fine processing.

A device is expediently provided through which the abrasive is fed to the cylinder; such a facility can consist of a pump and a reservoir if the abrasive is a liquid. Preferably a stamp is used variable speed used; for example, the working speed of the punch can be between one and ten working strokes vary per minute.

Further advantageous developments of the invention are set out in the subclaims specified. With the aid of the drawings, two exemplary embodiments of the invention are explained in more detail. Show it:

Fig. 1 is a partially sectioned side view of a first Embodiment in which an abrasive suspended in a solid wax is used,

FIG. 2 shows a view corresponding to FIG. 1 of a second Ausi management example, in which a liquid abrasive ver-I is turned.

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In both embodiments, a cylinder 1 is horizontal with one extending cylinder bore 2 is provided, in which one at the end a hydraulic ram 4 attached piston 3 to and fro is stored. As a result of the advancing movement of the punch 4, the abrasive is removed from the cylinder 1 through the opening 5 of a tool 6 pressed while the tool 6 is in a tool holder 7 is held. The cylinder 1 is attached to a base plate 8.

In the AusfUhrungsbeispiel shown in Fig. 1 is the rear Half of the cylinder 1 above a horizontal diametrical plane

^ recessed, creating a loading opening into which the waxy Abrasive is introduced when the piston 3 is in its retracted position. The piston 3 is indicated with dash-dotted lines in its front end position, in FIG which previously pressed the abrasive through the opening of the tool has been and the piston is ready to be retracted again. The tool holder 7 is held in a tool carrier 9, the is provided with an opening 10 through which the abrasive exits. The tool carrier 9 is against an end flange 12 of the

P cylinder clamped by means of nuts I3, which are opened by the Flange 12 extending clamping screws 14 are screwed.

The tool carrier 9 can be slid on two parallel slide rods 15 stored so that it can be moved away from the front end of the cylinder 1 after loosening the nuts 13, so that the tool 6 and the Tool holder 7 can be removed. Furthermore, a guide rod 16 is provided which is deq rearward from the upper portion

[Tool carrier 9 protrudes and in the end flange 12 of the cylinder

! is guided in a sliding manner. To move the tool carrier 9 is

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a hydraulic ram 17 is provided.

On the base plate 8 and the end flange 12 of the cylinder is a Frame support 18 welded, and a frame support 19 carries the housing 20 of the punch 4. The punch 4 can, for example, a exert a maximum pressure of about 50 tons, and this pressure is exerted by the base plate 8 below the punch 4 and two left profile rods 22, which extend between the upper edges of the frame beams 18, 19, was added.

In the embodiment shown in Fig. 2, the cylinder at its front end a counterbore 25 of larger diameter which forms a seat for the tool holder 7. The tool holder 7 is in this position by suitable means, for example radially displaceable pins 24, which are in circumferential grooves 25 of the ! Tool holder 7 grip, held releasably. The tool holder 7 'has a through hole 26, which at its rear end with a counterbore is provided to seal the tool 6 during machining.

The ram 4 can, for example, also exert a maximum pressure (of 50 tons, at a speed between one and ten working strokes per minute varies. As the punch 4 approaches the rear end of the cylinder, an in the cylinder wall formed inlet opening 27 covered. Two reservoirs 28 and 29 contain a coarse and fine abrasive, respectively in the form of a viscous liquid, and these reservoirs are connected to the inlet port 27 via lines 3Qj,

I , each of which has a shut-off valve 32 or 33 and a pump 34 <

or 35 contains. Thus, either coarse or fine -6-

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Abrasives are fed to the cylinder 1 when the punch 4 is in its retracted position, and during the next working stroke of the punch 4, the abrasive is through

'The opening 5 of the tool is pressed, whereby the side wall of the opening is smoothed by abrasion. The stamp is and moved until the desired surface finish is achieved; this is initially the coarse and finally the fine abrasive used.

After the abrasive has passed through the opening of the tool 6, it is collected in a hinged hood 36 and returned through an outlet opening yi and a two-way switch valve 38 into the corresponding storage container. The hood 56 normally covers, as shown, the front end of the cylinder 1, but can be folded up so that the tool holder 7 can be exchanged. Each of the reservoirs 28 and 29 contains a filter 39 which cleans the abrasive and removes the residue from abraded material.

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Claims (1)

PuiratanwäMe Dr. Ing.H Negeodanlc Dip !. Ing.H. Hewck Dipl. Pry * W- Schmitz i. <«- <* · f 5.deutest .23 Edward George Feldcamp Tel. * Wo5 36 00 Robert Burne Avenue, September 15, 1970 Benhall, Cheltenham, England Attorney File M-I328 Patent claims 1.) Process for the surface treatment of a prefabricated opening a component consisting of a hard material, preferably metal, in particular an extrusion tool to which the component is clamped or otherwise held, characterized in that an abrasive through the opening of the component is pressed. 2. The method according to claim 1, characterized in that as abrasion medium a solid, waxy substance is used. 3. The method according to claim 1, characterized in that a liquid or paste-like substance is used as the abrasive. 4. The method according to claim 3, characterized in that the Ab ⁱ friction agent is pumped around in a circuit. 5. The method according to claim 4, characterized in that the be-I used abrasive is filtered and returned to a storage tank, from where it is pumped again. -8-109813 / 1 ?? / * 6. Device for performing the method according to one of the preceding Claims, characterized by a cylinder (1), at one end of which a holder (7) is attached, and a by a piston (4) actuatable piston (3) in the cylinder is mounted to move back and forth and the abrasive through the opening (5) of the held in the holder (7) to machining component (6) presses. 7 · Device according to claim 6, characterized in that the Zy-> · linder (1) is recessed at its end facing away from the holder (7), whereby a loading opening is formed through which the abrasive can be introduced into the cylinder (1) (Fig. 1). .8th. Device according to claim 6 or 7, characterized in that the holder (7) is inserted in a carrier (9) which, during operation, is secured by clamping means (15) to an end flange of the cylinder (1) clamped and after loosening the clamping means (13) can be moved away from the end of the cylinder (1) so that the component to be machined (6) can be exchanged. 9 · Device according to claim 8, characterized by a further Stamp (17) which moves the carrier (9) after the clamping means (13) have been released. 10.Vorrichtung according to claim 6, characterized by one in the Cylinder wall formed inlet opening (27) for filling the abrasive, which can be covered when the stamp (4) the Approaching the end of its return stroke. -Q- 10 9 8 13/1224 111.Vorrichtung according to claim 10, characterized by a storage ¹ container (28,29), into which the abrasive flows back after flowing through the component to be processed (6) and the holder (7), and a pump (34,35) drawing the abrasive from the reservoir conveyed back to the inlet opening (27). 12.Vorrichtung according to claim 11, characterized in that the Vor-I advice container (28,29) is assigned a filter (39) that the Ab-! abrasive cleans and the residues from rubbed off material 1 removed. 113.Vorrichtung according to claim 12, characterized in that two Storage containers (28,29) are provided, one of which contains coarse and the other fine abrasive and their use can be controlled by optionally actuatable valves (32,33). 109813/1224 Blank page