Generally speaking, it refers to the methods of machining threads on workpieces with forming tools or abrasives, mainly including turning, milling, tapping, tapping, grinding, grinding, cyclone cutting and so on. When turning, milling and grinding threads, the transmission chain of the machine tool ensures that the turning tool, milling cutter or grinding wheel moves a lead accurately and evenly along the axial direction of the workpiece every time the workpiece rotates. When tapping or tapping, the cutter (tap or die) and the workpiece make relative rotary motion, and the cutter (or workpiece) is guided by the pre-formed thread groove to move axially. Thread turning When turning threads on a lathe, you can use a forming lathe tool or a thread comb tool. Because of its simple structure, forming turning tool is a common method to produce threaded workpieces in small batches. Using thread comb cutter to turn threads has high production efficiency, but the cutter structure is complex, which is only suitable for turning fine teeth and short threads in medium and large-scale production. Generally, the pitch accuracy of trapezoidal thread turning by ordinary lathe can only reach 8 ~ 9 grades; Machining threads on a special thread lathe can significantly improve productivity or accuracy.

2) Thread milling

Milling with disc cutter or comb cutter on thread milling machine. Disc milling cutter is mainly used for milling trapezoidal external thread on screw, worm and other workpieces. Comb milling cutter is used for milling internal and external common threads and tapered threads. Because it is milled by a multi-edge milling cutter, the length of its working part is longer than the length of the thread to be machined, so the workpiece can be machined only by rotating 1.25 ~ 1.5 revolutions, and the productivity is very high. The pitch accuracy of thread milling can generally reach 8 ~ 9 grades, and the surface roughness R 5 ~ 0.63 microns. This method is suitable for mass production of threaded workpieces with average precision or rough machining before grinding.

3) thread grinding

It is mainly used to process the precision thread of hardened workpiece on thread grinder, and it can be divided into single-line grinding wheel and multi-line grinding wheel according to the different cross-sectional shapes of grinding wheels. Single-wire grinding wheel can achieve pitch accuracy of 5 ~ 6 and surface roughness of r 1.25 ~ 0.08 micron, which is convenient for grinding wheel dressing. This method is suitable for grinding precision screws, thread gauges, worms, small batches of threaded workpieces and shovel grinding precision hobs. Multi-line grinding wheel grinding is divided into longitudinal grinding method and cut-in grinding method. In the longitudinal grinding method, the width of the grinding wheel is smaller than the length of the thread after grinding, and the thread can be ground to the final size by moving the grinding wheel longitudinally for one or several strokes. The width of grinding wheel in plunge grinding method is greater than the length of grinding thread. When the grinding wheel cuts into the surface of the workpiece radially, the workpiece can be ground in about 65438 0.25 revolutions, with high productivity, but slightly lower accuracy, and the grinding wheel dressing is more complicated. The cut-in grinding method is suitable for large-scale shovel grinding of taps and grinding of some fastening threads.

4) thread grinding

Nut-type or screw-type thread grinding tool is made of soft materials such as cast iron, and the part of the workpiece with pitch error is rotated back and forth to improve the pitch accuracy. Hardened internal threads are usually ground to eliminate deformation and improve accuracy.

5) Tapping and tapping

Screw the tap into the pre-drilled bottom hole on the workpiece with a certain torque to process the internal thread. Turning thread is to cut the external thread on the rod (or tube) workpiece with a mold. The machining accuracy of tapping or tapping depends on the accuracy of tap or die. Although there are many ways to process internal and external threads, small-diameter internal threads can only be processed with taps. Tapping and tapping can be done by hand, or by lathe, drilling machine, tapping machine and tapping machine.

6) Wire rolling

The invention relates to a processing method for obtaining the plastic deformation of a threaded workpiece by forming a rolling die. Wire rolling is generally carried out on a wire rolling machine. The thread rolling machine is carried out on an automatic lathe with an automatic thread rolling head, which is suitable for mass production of standard tight and tough external threads and other threaded joints. Generally, the outer diameter of the rolled thread is not more than 25mm, the length is not more than 100mm, the thread accuracy can reach Grade 2 (GB 197-63), and the diameter of the blank used is roughly equal to the middle diameter of the processed thread. Generally, the internal thread cannot be processed by rolling, but for soft workpieces (the maximum diameter can reach about 30 mm), the internal thread can be cold extruded by slotless extrusion tap, and the working principle is similar to tapping. The torque required for cold extrusion of internal thread is about 1 times that required for tapping, and the machining accuracy and surface quality are slightly higher than tapping.

There is a big difference between sheet metal processing and machining.

Generally speaking, sheet metal is used to bend plates, such as steel plates, galvanized plates, or made into specified shapes, chimneys, water tanks and the like. Shearing machines and bending machines are generally used.

Machining is more complicated, mainly processing parts. The material is generally block or whole, but there are also plates. But not bending deformation, but cutting. Now commonly used are lathes, milling machines, grinders, wire cutting, numerical control, spark machines and other processing equipment.

I don't know if you understand what I said.

Metal plates are usually cut or bent or something.

Machining is cutting metal.

Economic machining accuracy of machining methods: mechanical design manual, tolerance and coordination unit or mechanical process manual.

What processing method does lathe thread belong to? Of course, it belongs to cutting, but the tool takes a spiral line.

How to process variable pitch thread on CNC lathe, how to process such variable pitch thread, and how to program Huazhong system. The landlord will give you a concrete plan, whether it is gradual change or sudden change, whether it is bigger or smaller, and how big the thread is. There is no such instruction in Huazhong system, so it can only use macro programs, but the running speed of a rotten system like Huazhong is too poor, so it may not come out, depending on your requirements.

The difference between gear shaping and hobbing;

As the name implies, the gear shaper cutter is used to move the cutting material back and forth parallel to the gear shaft, thus obtaining the gear.

Gear hobbing:

The tool and the workpiece material roll and mesh with each other, and finally a gear with the same module as the tool is formed.

Can M3 left-handed thread be machined? What is the processing method? The tapping of general reverse taps may be sold in a full range of tool shops. I once bought M6 reverse faucet, but I don't know if M3 faucet can be bought.

According to different processing methods, China tea can be divided into basic tea and reprocessed tea. According to the different processing methods and varieties of fresh leaves, basic tea can be divided into six categories: (green tea), black tea, oolong tea, white tea, yellow tea and black tea. After reprocessing and deep processing, these six basic teas can be made into various processed teas, such as scented tea, fruity tea, canned tea beverage, instant tea, teabag, pressed tea, health tea and so on.

Excuse me, what are the processing methods of bearing base blank? What are the advantages and disadvantages of various treatment methods? Casting, forging and powder metallurgy are generally used, but they are rarely used.

The main difference between turning and milling cymbals is that a machine tool turns parts and a lathe turns rotating parts. On the lathe, you can also use drills, reamers, taps, dies and knurling tools for corresponding processing.

Milling mainly uses milling cutter to process various surfaces on the workpiece, which can not only mill planes, grooves, gear teeth, threads and spline shafts, but also process more complex contours. The efficiency is higher than that of planer, and it is widely used in machinery manufacturing and repair departments.

Planing machine, a linear motion machine tool for planing the plane, groove or molding surface of a workpiece with a planer. Using planer to process, the cutter is simple, but the productivity is low (except for processing long and narrow planes), so it is mainly used in single-piece and small-batch production and machine repair workshops, and mass production is often replaced by milling machines.