Fuzhou instrument valve factory according to the needs of production development, plans to establish a ball valve ball processing production line, in view of the factory does not perfect stainless steel ball casting, forging equipment (urban areas do not allow the impact of urban environment, production equipment) Association of workers, not only costly, unstable quality, and delivery can not be guaranteed, affecting the normal production. The rough obtained by the two methods has the disadvantages of large machining allowance, low material utilization rate, especially the leakage of capillary pores in the cast sphere, leading to high product cost and difficult quality stability, which seriously affect the production and development of the factory. Therefore, the ball processing technology transformation is imperative. 1, the principle of ball spinning 1.1, the technical parameters of the ball valve (see Table 1) Table 1: Technical parameters of the ball Sphere technical parameters 1.2, ball forming method comparison (1) Casting method This is a traditional processing method, which requires a Complete sets of smelting, pouring and other equipment, but also the need for larger plants and more workers, large investment, many processes, the production process is complex, and pollute the environment, the technical level of each process a direct impact on the quality of products, the ball capillary Hole leakage problem can not be completely solved, while rough machining allowance, waste, often found in the process of casting defects so that it scrapped, to make the product cost increases, the quality can not be guaranteed, this method should not be used by the factory. (2) forging method This is the current domestic many valve companies used another method, which has two kinds of processing methods: First, cut with a round steel forged into a hollow solid, and then mechanical processing. The other is the unfinished stainless steel plate in the large press molding, hollow hemispherical blank, and then welded into the ball blank machining, this method of high utilization of materials, but to a high-power Press and heating furnace and argon soldering equipment, investment is expected to need 3 million yuan to form productivity, this method is not suitable for the factory situation. (3) Spinning method Metal spinning method is an advanced and less, no-chip processing methods, belonging to the new branch of the pressure processing, which combines the process characteristics of forging, extrusion, rolling and rolling, with high material utilization rate Up to 80-90%), save a lot of processing time (1-5 minutes forming), after spinning the material strength can be doubled. As spinning, the small area of ​​contact with the workpiece, the metal material in two or three-way compressive stress state, easy to deform, with smaller power, you can get a higher unit of contact stress (up to 25- Therefore, the equipment is light weight, the total power required (less than 1 / 5-1 / 4 of the press), has been recognized by the foreign valve industry is an energy-saving ball processing technology program, but also apply In the processing of other hollow rotary parts. Spinning technology has been widely used in foreign countries and high-speed development, technology and equipment are very mature and stable, and to achieve mechanical, electrical and hydraulic integration of automatic control. At present, spinning technology in our country has also been greater development, has entered the promotion of practical stage. 2, Spinning the ball rough technical conditions According to our production needs and combined with the characteristics of spinning deformation, the following technical conditions: 1) Spinning rough material and type: 1Gr18Nr9Tr, 2Gr13 steel or steel; (2) Spinning ball The shape of the blank shape (see Figure 1): Figure 1 Spinning the ball blank Figure 3, spinning the program Spinning ball by the selection of different types of blanks, the effect is not the same, the analysis can be used in two programs: 3.1, Pressure method This program is divided into three steps: The first step is to cut the steel pipe according to the size, the folder with the spindle in the Spinning Machine Spindle chuck together with the rotation of the wheel by means of hydraulic profiling device for a number of spinning tube , So that it gradually taper shut (see Figure 2), the formation of semi-circular ball; the second step will have been formed ball part cut, and the processing of welding bevel; the third step will be two hemispheres brazing welding with argon Into the desired hollow sphere blank. Figure 2 Pipe necking Figure pipe necking Spinning method advantages: no mold, forming process is relatively simple; disadvantages are: need to use a specific steel pipe, weld, and the higher cost of steel. 3.2, the common law of steel plate This program has two ways: the first way the flat circular material using the tailstock hydraulic top force, pressed on the outer surface of the spherical core mold, together with the spindle rotation, the use of hydraulic profiling device , After several times by spinning so that the plate gradually shrinking deformation attached to the mandrel (see Figure 3), get a hollow hemisphere, and then cut off the excess burrs and welding groove, the two hemispheres with argon solitary Hollow ball blank welded into the required. Figure 3 Spinning hemispherical plate The second way the same flat rough with flat rough, spin the hemispherical is different, but also need to spin out a cylindrical semi-finished product shown in Figure 4 (a), and then the semi-finished blank In the inner hemispherical core mold, using the same tailstock with the same diameter mandrel pressing, and steel pipe necking the same spinning method, the cylindrical section gradually shrink (closing) to form the other hemisphere, and the mouth Excess metal is attached to the ram, and the excess is cut off to obtain a desired hollow core blank as shown in Figure 4 (b). Figure 4 Flat Spinning Whole Hollow Sphere Plate Spinning Method This method Advantages: Convenient source of steel, the price is relatively low compared with the steel, to achieve a complete hollow structure of the ball. Compared with the previous scheme of steel tube necking spinning method, the disadvantage is that two core dies are needed, the spinning process is complicated, the structure and control of the required spinning equipment are complicated and the cost of the equipment is high, but in terms of economic benefits and product quality Analysis, this program is still the best solution. 4, the choice of spinning machine The spinning machine by the machine, electricity, liquid three parts, is more advanced mechanical and electrical integration of more advanced medium-sized machine tools. Machine schematic principle (see Figure 5). It consists of spindle gearbox and hydraulic ejector, tailstock, spinning wheel frame, bed and other parts. Figure 5 Schematic diagram of the spinning machine In hydraulic transmission, there is a hydraulic station and its hydraulic system, which provides the machine with all but the main shaft rotation power. Rotor horizontal spin profile control device, including profiling valve, profile plate, adjusting mechanism and bracket. In the electronic control of the use of advanced computer automation, spinning process to achieve automation. 5 Conclusion The comparison of various processing schemes mentioned above shows that the flat ball spinning with a flat plate is the best solution, and achieves the expected effect both in the process and the product quality. However, everything has its two sides, the flat-plate spinning ball complex process, the required structure and automatic spinning control equipment have higher requirements, limited its promotion.
In conclusion, the European Standard Wire Rope Hoist is a reliable and safe lifting equipment that is widely used in various industries. Its adherence to the European standard ensures that it meets the highest level of safety, reliability, and performance, making it an ideal choice for any lifting application.
European Type Wire Rope Hoist is a type of lifting equipment that is used to lift and move heavy loads in various industries such as construction, manufacturing, and mining. This type of hoist is designed and manufactured according to the European standard EN 13157, which ensures the highest level of safety, reliability, and performance.
The European Standard Wire Rope Hoist consists of a motorized drum that is connected to a wire rope. The wire rope is wound around the drum, and as the drum rotates, the rope moves up or down, lifting or lowering the load. The hoist also includes a lifting mechanism, which can be electric or manual, and a control system that allows the operator to control the hoist's movements.
One of the key features of the European Standard Wire Rope Hoist is its safety features. These hoists are equipped with various safety devices such as overload protection, emergency stop buttons, and limit switches, which ensure that the hoist stops automatically when it reaches its maximum load capacity or encounters any other safety hazards.
Another advantage of the European Standard Wire Rope Hoist is its versatility. These hoists can be used in various applications such as overhead cranes, gantry cranes, and jib cranes. They are also available in different sizes and capacities, making them suitable for lifting loads of different weights and sizes.In conclusion, the European Standard Wire Rope Hoist is a reliable and safe lifting equipment that is widely used in various industries. Its adherence to the European standard ensures that it meets the highest level of safety, reliability, and performance, making it an ideal choice for any lifting application.
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