A ring member on which the notch B needs to be milled by a milling machine. There are two sizes of B, 10 mm and 12 mm respectively, and the outer circle D of the ring member is distributed within Φ 63-135 mm, and the thickness of the ring member is small, 3 mm. . For the iron clamp designed for this ring, it mainly consists of a positioning block, a V-shaped groove, a positioning key, a fixed plate, a rear support, a pressure plate, a front support and a screw. The ring member is centered on the two positioning blocks and abuts against the rear support, and then the screw is used to press the pressure plate to press the ring member, after which the notch can be milled.
Since the outer dimension D of the ring member varies widely, the V-shaped groove is designed as a variable structure, that is, positioning blocks of different thicknesses are disposed on the two inclined faces of the V-shaped groove. As long as two equal thickness positioning blocks are replaced at the same time, a new V-shaped groove coplanar with the center plane of the original V-shaped groove can be formed. The thickness of the positioning block is divided into three size segments according to the outer circle size of the workpiece, and the ring members are also divided into three groups according to the outer circle size, the thick positioning block corresponds to the small outer ring shape, and the thin positioning block corresponds to the large outer ring member.
In order to facilitate the determination of the relative position of the tool and the ring member, a tool slot is provided on the rear seat. In order to accommodate the counters (10 mm and 12 mm) of different thickness milling cutters, the distance between the two sides of the notch slot to the center plane of the V-groove is made into two dimensions, one is 8 mm and the other is 9 mm. Milling of 10 mm and 12 mm notch widths is possible with a 3 mm thick feeler gauge. When the knife is used with other thickness gauges, the gaps of other sizes of the ring can be milled.
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