The following material is a forging process. Cutting the level of quality, weight and size is accurate or not, the cross-section geometry is good or bad, will directly affect the quality of the forging process and forgings.
Foreign bearing industry due to the high-speed upsetting machine, flat forging machine with side slider, multi-press forging production line more, these lines directly bar forging of bearing rings, thus cutting the number is relatively small. In order to improve the geometric accuracy and weight accuracy of cutting, first, to bar the implementation of radial compression, the second is to improve the shear rate. And a higher degree of automation of foreign equipment for cutting, generally have to unload, feed, automatically excluded from the head, automatic monitoring devices.
Traditional cutting method is basically the open cut, the cutting of poor quality, the weight difference of about 5%, face tilt is much larger than 3 °. Therefore, the domestic manufacturers are exploring some new methods.
For the majority of domestic manufacturers, generally with the abrasive material in the shear is applied to a single point presses, made in the improvement of the abrasive material quality of a lot of useful work are mainly due to the shear bar axial runout and warping effects, there has been a sleeve-type shear modulus. Even if the shear fixed blade and the shape of the blade and the cross-section of the bar the same shape, the flattening of the warp and the blade of the limit shear bar when the bar shearing, the shear quality has been improved significantly. Actual production of cold material weight difference may be controlled at 1%, collapsed depth of 0.5mm, face inclination is less than 2 ° 30 '; for hot material difference in weight within 2% to the face inclination 3 °. Constrained shear modulus. Radial stepping up the way so that the warping of the bar, the axial movement and incision squash are subject to restrictions. This way, some only in the fixed knife side to step up, and some end in the fixed knife and knife side to be stepping up, stepping up the way the cylinder type, institutional linkage. The blades are made of the same shape as the section shape of the bar, this abrasive can be with automatic feeding devices. This way of cutting weight difference may be control less than 1%, the inclination of the section is less than 2 °.
Bar-cutting machine use also increased, basically on the form of a production line running. Medium frequency induction heating, automatic feeding, automatic feed, (individual with) the automatic detection, the high degree of automation, and shearing machine has a radial stepping up device, the rigid body is good, backgauge automatically adjust, cut cut quality has been greatly improved compared to the old-fashioned shears can be achieved by the shear weight of the error is less than 1.5% cross-section inclination is less than 3 °.
The band saw cutting foreign products, domestic use. Since the band saw a highly rigid structure, the rail-oriented and reliable; feed control to ensure work in low-speed stability and stable cutting force; bar to step up and reliable. Thus, accurate cutting weight, the face of good quality, and cutting a wide range of



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