In the current market, there are two machining methods for ball screw: 1. Chip machining (cutting forming); 2. Chip free machining (plastic machining). The former mainly includes turning and whirlwind milling, while the latter includes cold extrusion and cold rolling. Today, let's talk about these two processing methods

一、有屑加工

1、 Chip processing

丝杆有屑加工指利用切削成形的方法加工丝杆，主要有车削、旋风铣削。

The machining of screw rod with chip refers to the machining of screw rod by cutting forming method, mainly including turning and whirlwind milling.

车削：车削是在车床使用不同的车刀或其他刀具，可以加工各种回转表面，如内外圆柱面、内外圆锥面、螺纹、沟槽、端面和成形面等，加工精度可达IT8-IT7，表面粗糙度Ra值为1.6-0.8，车削常用来加工单~轴线的零件，如直轴和盘、套类零件等。

Turning: turning is the use of different turning tools or other tools in the lathe, which can process various rotary surfaces, such as internal and external cylindrical surface, internal and external conical surface, thread, groove, end face and forming surface. The machining accuracy can reach it8-it7, and the surface roughness Ra value is 1.6-0.8. Turning is commonly used to process single axis parts, such as straight axis, disc and sleeve parts.

旋风切削：旋风切削是一种率的螺纹加工方法，适用于批量较大的螺纹粗加工，其工艺是用硬质合金刀对螺纹进行高速铣削，它具有刀具冷却好、生产效率高的优点。精度要求不高的螺纹，可用此法一次完成切削加工。

Whirlwind cutting: whirlwind cutting is a high-efficiency thread processing method, which is suitable for large batch of thread rough machining. Its process is high-speed milling of thread with cemented carbide cutter. It has the advantages of good tool cooling and high production efficiency. This method can be used to finish the machining of thread with low precision.

二、无屑加工

2、 Chip free machining

丝杆无屑加工指利用金属塑性成形的方法加工丝杆，主要有冷挤压、冷轧。

Lead screw chip free processing refers to the use of metal plastic forming method to process lead screw, mainly including cold extrusion and cold rolling.

冷挤压：冷挤压就是把金属毛坯放在冷挤压模腔中，在室温下，通过压力机上固定的凸模向毛坯施加压力，使金属毛坯产生塑性变形而制得零件的加工方法。目前我国研制的冷挤压件一般尺寸精度可达8-9级。

Cold extrusion: cold extrusion is to put the metal blank in the cold extrusion die cavity, at room temperature, through the punch fixed on the press to exert pressure on the blank, so that the metal blank has plastic deformation and parts are made. At present, the general dimension accuracy of cold extrusion parts developed in China can reach 8-9 grades.

冷轧：冷轧是在常温状态下由热轧板加工而成，虽然在加工过程因为轧制也会使钢板升温，尽管如此还是叫冷轧。滚珠丝杆螺纹滚道的冷轧成形过程是轧辊与金属圆棒料之间形成的摩擦力，在螺旋压力的推动下使金属棒料被咬入滚轧区，然后在轧辊的强制滚压力作用下产生塑性变形的过程。

Cold rolling: cold rolling is made of hot-rolled plate at room temperature. Although in the processing process, because rolling will also make the steel plate warm, it is still called cold rolling. The cold rolling forming process of the ball screw thread raceway is a process in which the friction force between the roll and the metal round bar is formed, and the metal bar is bited into the rolling area under the push of the spiral pressure, and then the plastic deformation is produced under the action of the forced rolling pressure of the roll.