A Split Extrusion Tap
A technology for extruding taps and extrusion parts, which is applied in the field of internal thread forming tool equipment, can solve the problems of large deformation resistance, tap strength, and frictional heat in contact conditions, and achieve the effects of reducing frictional heat, simple structure, and convenient use
Inactive Publication Date: 2017-07-18
SHAANXI UNIV OF TECH
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Problems solved by technology
At present, the main problem in the process of extruding the internal thread of the extrusion tap is the contradiction between the large deformation resistance of the extruded workpiece and the strength of the tap; conflict between
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[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0019] The present invention provides a split extruded tap, such as figure 1 As shown, it includes interconnected clamping part 1, calibration part 2, extrusion part 3 and guide part 4; as figure 2 As shown, the calibrating part 2 and the extruding part 3 are respectively provided with calibrating part rib teeth 201 and extruding part rib teeth 301 .
[0020] like image 3 As shown, the tooth shape of the calibration part rib 201 is a triangular prism after being expanded, and the cross section of the triangular prism is an isosceles triangle, the apex angle is 60°, and the relationship between the height h and the pitch P of the calibration part rib 201 is:
[0021]
[0022] The top of the calibrating portion tooth 201 is arc-shaped.
[0023] like Figure 4 As shown, the tooth shape of the rib tooth 301 of the extrusion part is a tri...
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The invention discloses a chopping extrusion screwdriver. The chopping extrusion screwdriver comprises a clamping part, a calibrating part, an extrusion part and a guide part which are mutually connected, wherein the calibrating part and the extrusion part are respectively provided with calibrating part ridge teeth and guide part ridge teeth. The chopping extrusion screwdriver has the advantages that the structure is simple, and the convenience in use is realized; the width of each ridge tooth of the extrusion part is gradually increased, the tooth-shaped angle is gradually increased, and the pure extrusion process in the prior art is changed into the process of first chopping and then extrusion; the extrusion force in the extrusion process is reduced, the contact condition of the deformed area is improved, and the friction heat is reduced; the deformation resistance of the extruded workpiece is reduced, and the chopping extrusion screwdriver is suitable for processing threads on materials with poorer strength and rigidity.
Description
technical field [0001] The invention belongs to the technical field of internal thread forming tool equipment, and in particular relates to a splitting extrusion tap. Background technique [0002] Internal thread extrusion processing is a process that uses cold extrusion on the bottom hole of a prefabricated workpiece to cause plastic deformation of the metal of the workpiece to form an internal thread. The surface quality, dimensional accuracy, material utilization rate and mechanical properties of the internal thread manufactured by extrusion forming are superior to those of traditional cutting forming, and a cold hardening layer will be formed on the thread surface to improve the service life of the thread. At present, the main problem in the process of extruding the internal thread of the extrusion tap is the contradiction between the large deformation resistance of the extruded workpiece and the strength of the tap; contradictions between. Contents of the invention ...
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IPC IPC(8): B23G5/06
CPCB23G5/062B23G2200/34
Inventor 杜宇波张鹏升
Owner SHAANXI UNIV OF TECH