UA89326U - Combined deforming cutting broach - Google Patents

Abstract

A combined deforming cutting broach for treatment of deep holes in the parts such as the sleeves comprises a mandrel with deforming rings placed thereon, cutting sections and intermediate sleeves formed integrally with finishing and calibrating sections, a rear guide and a rear shank, and a front shank with front guide. A front deforming ring is straightening one, it has a taper lead with an angle of 8-20°, a cylindrical gauge 3-10 mm long tape and a diameter equal to the nominal diameter of hole of a tubular billet. The second deforming ring has a working curved profile that is consistent with the wave of non-contact strain, closes to itself a plastic hinge, transforms a non-circular hole of a billet into a round hole, performs work to achieve the concentricity of the defect layer and basic plastic deformation and hardening the wall core of the latter reinforcing the ring located in front of cutting sections each, increase the hardness, create the texture and tangential compressive stresses in the surface layer of the billet. The intermediate sleeves are made of a material having high damping capacity.