Cause Analysis The deformation caused by deformation is mainly caused by the following two reasons. The first aspect is that the wax mold itself is deformed. Because the cylinder and the body in the spring cover cavity are pressed separately, by hand bonding together, the poor bonding will tilt the cylinder. This deformation can be avoided by strengthening the on-site operation management. Deformation that occurs during solidification cooling. During the cooling process from the solidification of the casting to the room temperature, the shrinkage of the casting line is blocked and the shrinkage stress is caused. The intermediate cylinder is deformed due to a large shrinkage stress and insufficient rigidity of the casting structure. In addition, the casting temperature is too high, the casting shell is too early, and the like may cause deformation.
Process and tooling shrinking method The four corners of the blue are the thick part of the spring cover. Although there is a through hole here, the hot section is not decomposed, and an isolated hot node source is formed there, without smooth filling. The channel is loosened. Of course, the pouring temperature is too high, and the excessive impurities contained in the molten metal affect the flow of water, etc., which may cause shrinkage and shrinkage defects in the casting. Process improvement After the above reasons analysis, the following improvement measures are proposed for the above defects: degassing slagging, purifying molten steel, first ensuring that the quality of molten steel is fully qualified. Strictly control the pouring temperature of molten steel. Solving the deformation problem Under the premise of controlling the pouring temperature and pouring speed, the reinforcing ribs are used to solve the deformation problem of the inner cylinder of the cavity. The size of the reinforcing rib is related to the wall thickness at the joint, and three or four small calculations are used. Round ribs can be. The most common method to solve the shrinkage is to apply the riser feeding method, the internal and external cold iron method, and the casting and adding method is also called the meat adding method.
If you use the riser to shrink here, you can apply the dark riser, but it is not convenient to use the dark riser whether it is mold making or waxing. Because investment casting is hot shell casting, cold iron can not be used to increase meat. That is, the casting is sequentially solidified by increasing the wall thickness of the casting, thereby eliminating shrinkage and shrinkage. This changes the structure of the casting, only by mechanical processing to achieve the required size, but the inner cavity of the spring cover is very deep, there are obstacles in the cavity, not only the machining is difficult, but also increases the machining cost, comprehensive consideration Not desirable. The four corners of the method blue are four isolated hot section areas, which can only be supplemented separately. Therefore, it is thought to apply the supplementary ribs to solve the shrinkage problem here.
In addition, the spring cover should use the reinforcing ribs to solve the deformation problem. Therefore, it is considered to combine the two into one, one rib and two ribs, and at the same time solve the two defects of deformation and shrinkage, and the calculation formula of the supplementary rib is as a formula. In the formula, the size of a supplementary rib is set to the wall thickness of the spring cover at the rib. Through the calculation, the final decision is to use four small round-shaped reinforcing ribs to respectively fill the four corners of the method. Schematic diagram of the reinforcement of the reinforcing ribs process verification and conclusions In this trial production process, we strictly control the various processes to minimize the occurrence of all human-induced defects. The joint trials were made. After the castings were cleaned, there was no appearance shrinkage. The inspection room was tested by radiographic inspection, and only some of them were microscopically loosened. This pass rate is reached. The cutting of the reinforcing ribs from the middle position has obvious shrinkage, which indicates that the reinforcing ribs are fully utilized and play a role of feeding. In order to further verify the reliability of the process, several batches were tried and the yield was kept above. There are many ways to solve the casting casting defects. This paper achieves unexpected effects by clever application of the reinforcing ribs, and successfully solves the deformation of the spring cover and the shrinking casting defects.
A wire rope clamp (sometimes called a clip) is used to secure the loose end of the loop back to the wire rope. It usually consists of a U-bolt, a forged saddle, and two nuts. Two layers of wire rope are placed on the U-bolts. Then slide the saddle over the rope and attach to the bolts (the saddle includes two holes for the U-bolts). Nuts hold the unit in place. The wire rope is usually terminated using two or more clips depending on the diameter. A 2" (50.8 mm) diameter rope may require as many as eight.
There is an old saying: "A dead horse is without a saddle". This means that when installing the clips, the saddle portion of the assembly should be placed on the load bearing or "live" side of the cable, not the non-load bearing or "live" side of the cable. The "no power" side. According to U.S. Navy Manual S9086-UU-STM-010 Chapter 613R3, Wire and Fiber Ropes and Slings, "This is to protect the live or pressure-bearing end of the rope from pinching and damage. The flat bearing housing and body (saddle-shaped ) extension claws are designed to protect the rope and remain on the live end at all times."[18]
The U.S. Navy and most regulatory agencies do not recommend using such clips as permanent terminals unless regularly inspected and retightened. Encyclopedia website: ewikizh.top
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