Work holders – Magnetic holder
Patent
1980-06-24
1984-06-12
Bilinsky, Z. R.
Work holders
Magnetic holder
51217P, 269 43, 269246, 279 1M, 409903, B23Q 306
Patent
active
044537042
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of surface machining blanks into shanks for carbide tips or the like in working machines, such as mill cutters, in which method a plurality of blanks are placed side by side and fixed with or without shims therebetween, in a frame open at both sides, and in which method the frame is clamped in various positions relative to the machining tools of the working machines for processing the blanks therein so that machining of the blanks is effected at least at two of the sides thereof while the fixation of the blanks in the frame is maintained. Characteristic of the method is that the blanks are fixed in a substantially tensionless manner in the frame in such a position, where the blanks bear against the frame sides on which the machining forces work during machining, that the frame is first held clamped with one side resting against a machine support, while the portions of the blanks on the opposite side are machined, that the frame then is turned so that the blanks with their machined portions rest against a support consisting of a plane magnet plate, whereupon the blanks are machined on the side facing away from said support. Since the frame, with the blanks fixed without tension, is turned after the first machining operation so that the machined plane blank portions will be brought into plane engagement with the plane magnet plate, which secures safe retention of the blanks, it is possible to obtain a most exact working of the final shape of the shanks in the frame. Thus, the invention permits obtaining products of angular and dimensional accuracy at a reasonable cost.
The invention is also directed to an apparatus for retaining a plurality of blanks for shanks for carbide tips and the like in working machines such as mill cutters. The apparatus comprises a frame of preferably magnetic material, such as steel, in which the blanks are to be placed side by side and fixed. The frame is formed in such a way that the blanks can be machined from two sides without their fixation in the frame being changed. Characteristic of the apparatus is that the frame at one of its sides is so formed that the blanks fixed therein are available for machining from said side although they are intended to be situated inwardly of that plane of the side which is adapted to be kept fixed against a plane support during working of the fixed blanks from the opposite side of the frame outside the plane of which side the blanks are intended to reach.
The invention will be more fully described hereinafter with reference to the accompanying drawings which illustrate both the method and the apparatus and also some blanks adapted for machining and in which:
FIGS. 1-3 show by a way of example a frame in three directions at right angles to each other;
FIGS. 4 and 5 are respectively a top and an end view of a washer for the frame;
FIGS. 6-9 are top views of frames with blanks clamped therein;
FIGS. 10 and 11 illustrate two successive machining moments with retained fixation of the blanks in the frame;
FIG. 12 illustrates machining of the blanks by means of an end face mill; and
FIGS. 13-15 show three different blanks for shanks for carbide tips, which blanks can be machined in accordance with the present invention.
The apparatus of the invention consists of a frame 1 in which the blanks 2 are to be placed side by side and fixed with or without shims 3 therebetween. The frame 1 with the blanks 2 is, in turn, adapted to be clamped in various positions relative to the machining tools in various machines for processing the blanks 2 therein. Thus, machining of the blanks 2 can be effected at least at two of the sides thereof while the fixation of the blanks in the frame 1 is maintained. A rapid and economic production is obtained since the frame 1 allows simultaneous machining of a plurality of blanks 2 and the blanks 2 can maintain the same fixed position in the frame during two or more machining operations.
As appears from FIGS. 1-3 and FIGS. 10 and 11, the frame 1 is so formed at its side 4 that the blanks
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