At present, solid particle or dust filler is often used in the molding of a small diameter C-shaped spring tube with a small wall thickness. This process not only makes the C-shaped spring tube forming surface relatively uniform (filling amount and tightness under suitable conditions), and The process is simple and easy to operate. If the quality of the tube blank can be guaranteed, the molding process is relatively stable and suitable for mass production. The most commonly used in solid fillers is filled with enamel. This filling material is characterized by fine particles, similar to powder (to maintain a certain degree of dryness), filled in the spring tube, generally does not produce longitudinal after being sealed by the seal. Flow, the tube is relatively evenly stressed during molding, so the surface of the spring tube is smooth, and the sealing is cut after molding, and the workpiece is heated to a high temperature tube to melt and take out, and the operation is relatively simple. However, alum has a stimulating effect on human eyes and skin, and is unfavorable to human health. In addition, the molten alum water cannot be recycled, the filler becomes a consumable, and the cost is high, which is not suitable for mass production. Furthermore, alum is easy to swell, and it is easy to agglomerate after damp. This has an adverse effect on the filling quality. Agglomerated fillers create voids in the tube. The tube wall is unevenly stressed during forming, and the surface of the tube is bumped. phenomenon. In addition to using alum as a filler, a low melting point metal is also used as a filler. In the case of the filler, the filler is first heated to be in a liquid state, and after being cooled in the tube, it becomes a solid, and after heating, it is heated to make it flow out of the tube.
The advantage of this type of packing is that the packing is evenly distributed within the tube and can be used repeatedly to save on consumption. However, due to the multiple heating, the performance of the spring tube has a certain influence, for example, the displacement accuracy is poor when used. Therefore, the process does not have much superiority.
After the crank is shortened, it is beneficial to separate the joint, improve the joint rate, improve the quality of the combed strip to achieve the goal of high quality and high yield, and improve the clamp by the improvement of the nipper and the improvement of the drafting mechanism in the powerful carding mechanism. This is beneficial to increase the quantification of laps and the quantification of combed strips, and is also an effective way to produce high quality and high yield. By simplifying the mechanism, the weak links in operation are eliminated, the failure rate is reduced, and the operational reliability is improved. The technical performance of the FA26 comber is domestically leading and has reached the advanced level of similar foreign products. In 199, it was awarded the first prize of the scientific and technological progress of the textile industry in Shanxi Province. The core-removing process can reduce refueling, sealing, cutting and pouring. Processes such as materials make the manufacturing process somewhat simplified. For the wall thickness pipe (greater than 1mm copper pipe or stainless steel pipe), the lateral instability can be overcome when forming, and for the spring pipe with the wall thickness less than lmm and the curvature is relatively small, the spring end will be unstable on the lateral end face, thus making The end face is dumbbell shaped. In order to solve this problem, the mandrel must be specially designed and modified, and made of special materials, which brings great difficulties to loading and unloading. For the same method of processing, different materials or different methods of processing the same material have different effects on the molding process and product quality. For the filler molding, although the mechanical properties of the material have no obvious influence on the molding process, it has a great influence on the quality of the molded product. For example, the amount of alloying elements, the nature of the material, the degree of cold work hardening will affect the accuracy of the spring tube. For air core forming, the mechanical properties of the material not only have a great influence on the molding process but also on the quality of the product, especially the small curvature, and the thin-walled spring tube has a greater influence. After a large number of tests and repeated tests, it is found that it is easy to form a higher hardness, and it is difficult to obtain a good spring tube product with a low hardness. Generally, an ideal product is obtained, and the tube is formed (after surface cold). Hardening), its hardness must be controlled at about HV125-130, the hardness after molding can reach Hv skill O-160, and this index can meet the accuracy requirements of product design.
The process of using silicate materials as molding fillers instead of alum is the most economical and reasonable method to meet high efficiency and low cost. As long as it meets its certain particle size, strength and anti-knot performance, its filler can be used repeatedly, convenient for pouring, low cost, simple operation process, smooth surface and uniform cross section. For the core-forming forming process, when the working range of the pressure gauge is satisfied, the existing geometrical dimensions of the spring tube are changed, and the tube blank with stricter geometric requirements, hardness, strength, etc., and good consistency can be used in small batches. produce.
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