There are many processing methods for nuts, which can be processed by metal cutting methods, and can also be processed by metal plastic forming methods, that is, extrusion methods. At present, the main method of nut processing in China is cutting, that is, tapping the internal thread with tap. In the fastener industry, the nut tap is the only tool for machining the internal thread of the nut, and it can also process the internal thread of other through holes. It is basically a single branch for cutting processing, can be continuous cutting in the nut automatic tapping machine, high production efficiency. Tap in the process of tapping is a semi-closed multi-edge thin cutting process, compared with the turning thread, cutting conditions are harsh, chip discharge is not smooth, cooling lubrication is difficult, tap and the workpiece and chip friction is large, resulting in a lot of cutting heat can not be dispersed in time, so the tap is more easy to wear and break It is easy to cause defects such as excessive thread size, high surface roughness value, "rotten teeth" and "folding", which affect product quality. Extrusion threading is the use of metal material plastic deformation to tap the nut thread. An extruded tap is a tool that extrudes threads through plastic deformation of a material. Compared with the ordinary nut tap, the cutting part is a conical thread with complete tooth shape, and the end section of the working part is prismatic. The edge of the extrusion tap rotates, the edge moves relative to the axis, is squeezed into the hole of the nut blank, and the internal thread is extruded under a certain pressure.
(1) High thread accuracy and surface quality can be obtained due to cold extrusion forming, the metal fiber of the thread is not cut off and the work hardening of the organization, so the thread surface is dense, the strength, hardness and wear resistance have been improved, and because of its good orientation, the thread surface can be squeezed, so the thread quality is good. The accuracy can usually reach 6H, and the surface roughness value can reach Ra=6.3 ~ 1.6μm, or even Ra=0.8μm. (2) Long tap life is due to the use of metal plastic forming processing threads, extruded taps do not need to open chute, cross section made of polygonal shape is mainly to reduce the extrusion contact surface, reduce tapping torque, tap cross section is large, high strength, can withstand large torque, not easy to break. At the same time, the top of the tooth is an arc and is not easy to wear, so the tap life is long. Its tap life is 5 to 10 times higher than the general tap when processing steel. (3) High productivity extrusion tap extrusion of internal thread is a chip-free processing, so there is no chip removal, chip blocking and tap breakage and other problems, and extrusion processing is suitable for high-speed forming, conducive to the formation of high-speed production, high productivity.
(4) Tap manufacturing is more difficult extrusion tap manufacturing is more difficult, high lubrication requirements. Therefore, the extrusion tap is suitable for processing high-precision internal threads and metal materials with low strength and good plasticity. Such as copper, aluminum, stainless steel, low carbon steel and other low hardness, plastic materials, can also be used for some toughness, plasticity are high difficult to cut materials such as titanium alloy thread processing. Especially for the processing of thread without holes, thread processing below M6 with higher strength, accuracy requirements and lower surface roughness value, as well as thread processing of thin plate workpiece without holes or through holes, the extrusion tap effect is more significant. (5) The extrusion tap has higher requirements for the screw hole, and the screw hole is too large and the base metal is less, resulting in too large small diameter of the internal thread and insufficient strength. The screw hole is too small, and the closed extruded metal has nowhere to go, causing the tap to break.
معظم من ال قفل صناعة استخدامات أفقي التنصت آلة٪ 2c التي هي مقسمة إلى CAM تغذية نوع و ربيع تغذية نوع. متى العمل٪ 2c ال عامل التشغيل يصب a معين عدد من قضبان في ال قادوس ٪ 2c و من خلال ال الترددية حركة من ال شريط التمرير في ال تغذية مكون٪ 2c it يمكن أن يكون تلقائيا مرتبة. في عملية٪ 2c الصنبور كلاهما يدور و يتحرك محوريا٪ 2c و ال فارغ هو متحرك في على شكل حرف V أخدود لوحة إلى قص ال الموضوع.
ال قسم من ال قذف صنبور هو متعدد المنشوريات٪ 2c الصنبور أدناه M6 هو ثلاثة منشورية٪ 2c و ال الصنبور أعلاه M6 هو مصنوع من أربعة أو ستة منشورات. زوجي أرقام هي مستخدمة إلى جعل القوة متماثلة و سهل إلى تصنيع. قذف صنبور قطر 2c درجة و أخرى معلمات تتطلب عالية تصنيع دقة٪ 2c و لها التسامح هو 2٪ 2f3 إلى 4٪ 2f5 من ال عادي الصنبور.
