DE2452846C3 - Tool for removing burrs in or on openings of any cross-sectional shape in a workpiece - Google Patents

Description

The invention relates to a tool for removing a burr in or on any openings Cross-sectional shape of a workpiece, essentially consisting of a punch that is attached to a End region has a cut surface with a cut edge corresponding approximately to the cross-sectional shape of the respective opening, wherein by a Movement of the punch in the direction of the opening whose deburring takes place.

In the case of a cast part produced, for example, by the die-casting process, various types of manufacturing reasons in the edge area of a Form a cast burr opening. This may be the case with the aforementioned casting processes, for example, when an inserted into a first mold half hole core - must be applied to the force-fitting the end face to obtain an opening with ^r <sharp-edged exit site at a second mold half - as a result of lengths manufacturing tolerances or other werkzeugbediitgten influences of the second half of the mold is slightly set back Uneven shrinkage of one

in the casting or, for example, an eccentrically introduced hole core has the consequence that the perforations are different from their target position.

The cast burr was previously removed by punching punches whose cut surface was at right angles to theirs

π arranged longitudinal axis and with mechanical deburring usually od in a column guide frame. Device are used.

After the breakthroughs of a cast part deviating from their due to the aforementioned circumstances respective target position, the punch on the other hand, however, attack the openings with dimensional accuracy due to the device, it is as a result of a the resulting center offset is generally unavoidable that the cast burr at the exit point of the perforations only partially removed and the wall of the perforations from the punch something gets damaged. Compelling others require it Processing reasons that the casting must be in the device so that the cast burr

so the punch is facing, so the aforementioned disadvantage is further adversely affected, d. H. a centric introduction of the punch into the opening is difficult Even with a manually guided punch

Γι for its exact centering in the area of Breakthrough requires a considerable investment of time.

From DE-GM 72 06 544 a device for removing burr and / or vc "5 casting approaches is at

4Ii cast workpieces known the a punch press with a punching die in which the workpiece to be deburred has a gripper provided feeder arm is introduced. However, there is a special design of the cutting tool

4-1 cannot be found in this publication.

Furthermore, in the DD-PS 56 520 a device for Cutting and / or expanding, as well as simultaneous internal calibration of hollow bodies disclosed in the in a straight motion a calibration ring in one to

> n calibrating and cutting hollow body pressed will. In a subsequent turning cut, a ring is created from the inside according to the shape of the workpiece cut off without burrs. This publication does not convey the technical teaching for removing a casting burr.

"> -) The invention is based on the object of designing a tool built into a device or manually guided in such a way that the tool can be attached to a Burr located through a workpiece efficiently and completely, without any damage

M) of the workpiece can be removed.

To solve this problem, the invention consists in that starting at the free end of the punch from the cut surface, a centering device with a conical guide surface is arranged.

h ^r ) One advantage of the invention is to be seen in the fact that the punch is self-centering due to the conical guide surface of its centering device during the deburring process of an opening.

rend introduces this

In an embodiment of the invention it is provided that the centering device forms a cutting head which is composed of several cutting lips running in the longitudinal direction of the punch, the outer boundary surfaces starting from the largest Taper the diameter of the punch down to the smallest centering diameter.

This ensures that a cast burr, which if necessary completely covers an opening, passes through the centering device is cut into several parts so that they come out of the deburred opening can fall out without interference.

Various embodiments of the invention are characterized in further subclaims

An embodiment of the invention is shown in the drawing. It shows

Fig. ' a tool according to the invention is used in a column guide frame, with one between the longitudinal axis of the tool and the central axis If a workpiece is perforated, there is a center offset, and the tool is positioned before it is introduced into the Breakthrough is located

F i g. 2 one of the F i g. 1 essentially the same illustration, but with the tool for removal of the ridge is inserted into the opening,

F i g. 3 is an enlarged perspective view of the tool.

One shown in FIG. 3 illustrated punch 10 according to the invention consists of a cylindrical shaft part, one end of which is bounded by a collar 11. That The opposite end of the shaft part forms a cut surface 14. On this cut surface 14 is a Centering device is arranged which forms a cutting head 12. This cutting head 12 consists of four, in The longitudinal direction of the punch 10 running cutting lips 13 together.

The outer boundary surfaces of these cutting lips 13 each taper down to the smallest Centering diameter of the cutting head 12. Between the cutting surface 14 and the beginning of the conical A cylindrical guide part 15 is arranged in each case for cutting lips 13

For the mechanical deburring of a workpiece, the punch 10, as shown in FIG. 1 shows in a column guide gesture ?! 1 built-in This Säuknführungsgestell 1 consists essentially of a lower part 2, which carries a support plate 3, which firmly receives a workpiece a produced by the casting process. A pressure plate 5 is attached to an upper part 4 of the column guide frame 1 and is connected to a receiving plate 6. A compression spring 7 is supported on the pressure plate 5, the opposite end of which acts on a locking plate 8, which holds the workpiece a The locking plate is guided in a lateral trimmer 9

The receiving plate 6 has a bore 18 and this has a recess 19. In the bore 18 is the

ι »Hole punch 10 introduced in such a way that its collar 11 engages in the recess 19. The diameter of the bore 18 and the counterbore 19 is dimensioned in this way that between the wall of the bore 18 or the recess 19 and the outer jacket of the shaft part

π of the punch 10 and the federal 11 each one Radial play 16 exists. The end face of the collar 11 points with respect to the adjacent pressure plate 5 Axial play 20. A through hole 17 provided in the locking plate 8 is opposite the

ι »Shank of the punch 10 also with a Radial play 21 provided.

Caused by manufacturing-related influences or by manufacturing that is not dimensionally accurate, the longitudinal center axis b of the through-hole in the workpiece a

: ϊ a center offset c with respect to the longitudinal center axis d of the punch 10 (Fig. 1). To compensate for this center offset c during the deburring process of the cast burr at the through hole of the workpiece a by means of the inventive, in the Säulenfüh-

K) mounting frame 1 inserted punch 10 has whose cutting head 12 has a limited radial movement, which is achieved by the radial play 16 and Axial play 20 is given (FIG. 2).

When the punch 10 penetrates into the cast burr

r. is this through the four cutting lips 13 in individual Parts cut up so that they fall out of the through hole of the workpiece a without interference can. If the punch 10 penetrates further into the through hole, this is through the

4 (i cylindrical guide part 15 in the through hole precisely centered, as a result of which the cut surface 14 that ultimately becomes effective is still at the through-hole Punch out the existing cast burr with the same contour as its shape

4-, In the context of the invention, it is of course possible that the workpiece to be deburred through various non-cutting and cutting shapes can be made.

For this purpose 2 sheets of drawings

Claims (1)

Claims; 1, tool for removing a burr in or on openings of any cross-sectional shape of a workpiece, essentially consisting of a punch, which at one end region a Cut surface with an approximately corresponding cross-sectional shape of the respective opening Has cut edge, by a movement of the punch in the direction of the opening their deburring takes place, characterized in that at the free end of the punch (10), starting from the cut surface (14), a centering device with a conical guide surface is arranged Z tool according to claim 1, characterized in that the centering device forms a cutting head (12) which is made up of several in The cutting lips (13) running in the longitudinal direction of the punch (10) are composed of the outer ones Boundary surfaces start from the largest diameter of the punch to the smallest Taper the centering diameter. 3. Tool according to claims 1 and 2, characterized in that between the plane a cylindrical guide part (15) is arranged in each case on the cutting surface (14) and the conically arranged cutting lips (13) 4. Tool according to claims 1-3 and device for receiving the tool for machine deburring, characterized in that the punch (10) or its attachment in the device (Säulenfühiungsgestell 1) such is designed that the centering device with the cut surface (14) has a bega.izte radial movement possibility 5. Tool and device according to claim 4, characterized in that the punch (10) is inserted into a bore (18) of a receiving plate (6), which is in a column guide frame (1) is arranged with a collar (11) of the punch (10) in a recess (19) of the bore (18) engages and wherein furthermore the shaft and the collar (11) of the punch (10) opposite the bore (18) and the recess (19) has a radial play (16) 6. Tool and device according to claims 4 and 5, characterized in that a through hole (17) is provided in the area of a locking plate (8) for a workpiece (a) , with a radial play (10) between its wall and the shaft of the punch (10). 21) exists.