Method for forging large semi-round annular plate

Abstract

The invention discloses a method for forging a large semi-round annular plate. The method for forging the large semi-round annular plate includes the following steps that a steel ingot is heated to the initial forging temperature which is kept for 12 hours. The steel ingot is taken out, a pincers handle is manufactured at one end of a pouring dead head of the steel ingot in a pressed mode, a ingot body is chamfered, the outer surface of the steel ingot is rolled to be round, oddments at the bottom end are cut off, a forging stock is put into a furnace, the temperature is improved to the initial forging temperature which is kept for eight hours, the forging stock is taken out, forged and lengthened with the wide anvil powerful pressing forging method, the anvil width ratio is 0.4 to 0.7 when forging is carried out, an anvil is staggered for square drawing, the forceps handle and the excessive oddments of the dead head end at the forceps handle are cut off, a boss is forged on the lower surface of the middle of the forging stock, and the forging stock is put into the furnace and heated to the initial forging temperature which is kept for six hours. The forging stock is erected on a dedicated tool which is composed of a chambering mandrel supporter, a male mold and a female mold and undergoes bend forming. The forging stock is air cooled to the normal temperature and flaw detection is carried out. The special blanking method and the forging method are utilized, the split bend forming dedicated tool is used for forging, producing and finishing the large semi-round annular plate, and the boundary dimension of an inner arc and the boundary dimension of an outer arc meet the design requirement.

Description

technical field [0001] The invention relates to a mechanical processing method, in particular to a forging method of a large semicircular ring plate. Background technique [0002] The forging method of the existing workpiece is generally to heat the blank to a certain temperature, apply pressure to the blank on the forging machinery and form it, and use the punch and die as the upper and lower dies to constrain and ensure the external dimensions of the forging during forming. This method is more suitable for small workpieces, but it is unrealistic for the forming of large semicircular ring plates. One is that the workpiece itself is very heavy. The forging of a large semicircular ring plate weighs about 27 tons. It is very difficult to process such a workpiece with the help of punches and dies. The 2nd, even if can operate, the cost of making punch and groove is also relatively high, and difficulty is also big. The third is that if it can be produced, large-scale productio...

AI Technical Summary

Problems solved by technology

This method is more suitable for small workpieces, but it is unrealistic for the forming of large semicircular ring plates

One is that the workpiece itself is very heavy. The forging of a large semicircular ring plate weighs about 27 tons. It is very difficult to process such a workpiece with the help of a punch and a die.

The second is that even if it can be operated, the cost of making punches and grooves is relatively high and it is difficult

The third is that if it can be produced, large-scale production equipment also needs corresponding investment. If you want to produce the whole ring, there is not enough space for forging machinery and equipment, and the weight of the entire steel ingot is about 90 tons. Upsetting, punching, and reaming are all very difficult. operate

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