Final forging three forming steps. Mainly based on the following two points: First, reduce the number of final forging strikes, improve the life of the insert mold; Second, through two steps of upsetting, to maximize the removal of scale. Mold design structure and points The screw press can use a formwork structure similar to a hot die forging press to reduce the investment of expensive hot work die steel. Due to the rigidity of the equipment frame, the guiding precision is high, and the manufacturing precision of the mold base is also high. The mold adjustment during production is also convenient, and the product precision meets the requirements.
The final assembly diagram of the forging die of this product is shown. The forming upper mold and the lower mold adopt a pressure plate type assembly structure, and the disassembly is convenient. The setting of the pressure block is to prevent the forming cavity from being plastically deformed too fast or broken under a large striking energy; on the other hand, when the multi-station strikes, the upper and lower bearing surfaces are fitted to prevent the stroke setting from being improper and lead to zero. The component is accidentally damaged and plays a role in controlling the closing height of the mold. The length of the ejector should be designed appropriately. The forged piece after forming can be ejected by about 1. The unilateral hole of the ejector hole and the ejector should be designed, and the part should be repaired in time to prevent the deformation from being deformed after deformation and affecting the die. And possible forging deformation. The upper and lower pads are mainly used to prevent the forming portion from directly contacting the upper and lower mold frames to cause "sickness". When designing the cavity size, it is necessary to calculate the thermal size according to the condition of the equipment and the process requirements. The thickness direction is designed according to the negative difference, and even smaller values â€‹â€‹can be taken. The outer fillet and the die face on the mold should consider the wear condition of the mold and try to improve the life of the qualified parts of the mold. Under this forging equipment, the draft angle can be smoothly achieved.
The upper part of the mold base is formed on the upper part of the mold base, and the lower part of the lower part of the lower mold is formed. The main technical defects and solutions in the production of the lower mold top rod are in the production, heating and lubrication. Many factors such as operation, equipment operation and so on will lead to some process defects. In addition, the quality requirements of this product are high, and it is necessary to strengthen process control and take timely measures. Poor local fillet fills Poor fillet fills are mainly caused by poor fillet or fullness of forgings. Since these parts are generally non-machined surfaces, too large rounded corners affect the appearance. Although the frequency of such process defects is not very high, once it appears, it is difficult to repair successfully. To this end, we mainly take the following measures: control the secondary upset height, prevent the metal from flowing to the flash groove at the time of final forging due to the small height.
After lubrication and cooling during forging, the graphite emulsion remaining in the rounded corners of the mold is blown or cleaned in time to prevent it from impeding metal filling; and it is not suitable to spray the graphite emulsion during the strike to prevent the temperature from affecting the metal flow. Pass if necessary. The /0 control panel sets the "fill" step. The thickness dimension is super-positive. The thickness tolerance of the series of gear forgings is relatively small, and the thickness dimension is the quality characteristic required by the user. Therefore, we design the reasonable height of the flash bridge and use the negative design method reasonably. Guarantee. In production, due to the fluctuation of material weight and the impact force set by the operator, there are very few products that are still under-forged. The simple and effective method is, 1 thickness self-test, that is, using the sample plate when cutting the edge, for the unqualified temperature products that have nearly 2 or more temperatures due to this fashion can be "repaired" rework.
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