The production process of screw bars involves multiple steps and techniques. Here is a general workflow for screw bar production:

1. Raw material preparation: The first step in screw bar production is to prepare raw materials, usually high-quality steel. These steels need to undergo strict quality control to ensure their purity and strength meet production requirements.

2. Heating and rolling: The steel is heated to a high temperature to make it easier to shape. Then, it goes through a series of rolling mills to achieve the desired diameter and length. This process requires precise control to ensure the size and shape of the screw bars meet standards.

3. Cooling and shaping: After rolling, the screw bars need to go through a cooling and shaping process. Cooling is usually done using water or air to quickly lower the temperature of the screw bars. Shaping is achieved through specific equipment and techniques to maintain a stable shape and size of the screw bars.

4. Cutting and packaging: The cooled and shaped screw bars are then cut into specified lengths and packaged. During packaging, attention should be paid to prevent damage and contamination of the screw bars.

5. Quality inspection: Quality inspection is a crucial step throughout the production process. Various testing methods such as dimensional measurement, hardness testing, and surface inspection are used to ensure the quality of the screw bars meets relevant standards and customer requirements.

6. Factory release and transportation: Screw bars that pass the quality inspection are packed and prepared for factory release. During transportation, attention should be paid to protect the screw bars to avoid damage and contamination.

The production process of screw bars requires strict control of every step to ensure the quality and performance of the products. Meanwhile, with the continuous advancement of technology, the production techniques of screw bars are also constantly innovating and optimizing to improve production efficiency and product quality.