During the use of the pressure plates at both ends of the sealing machine, the vulnerable surfaces mainly occur on the slopes and arc surfaces of the outer edges, and often cannot be used because the working surface is frequently worn to a certain degree. If the cost of producing or ordering a new barrel pressure plate needs 3000-5000 yuan, and an annual output of 500,000 barrels needs to be replaced by 20 pressure plates, the total cost can reach 80,000 yuan, which is also a considerable expenditure. . In response to this problem, we have adopted the method of welding repair plus high frequency partial quenching so that the pressure plate can be reused, and this method only costs about 500 yuan. The method of welding repair and high frequency partial quenching on the pressure plate is introduced as follows:
First, the pressure plate welding repair using conventional carbon steel electrode wear surface surfacing, the elimination of internal stress low temperature annealing, according to the drawings will be surfacing to the original required size. The following points should be noted during the implementation process:
1. The electrode used should be close to the platen material characteristics to ensure good weldability and hardenability.
2. The purpose of annealing is to eliminate a small amount of deformation caused by welding, and the annealing temperature should not exceed 300 degrees to avoid surface oxidation caused by heating and affect the assembly size.
3. The wear surface of the pressure plate shall be symmetrically segmented during surfacing, that is, one welding quantity shall not be excessive, and horizontal layer-by-layer surfacing shall be adopted to avoid welding deformation and shedding.
Second, the welding plate after the repair needs to be quenched at the easy to wear to improve the wear resistance. In order to achieve the purpose of not only improving the wear resistance but also minimizing the heat treatment distortion, a high-frequency partial rotation quenching process is adopted. The general high-frequency hardening quenching depth is about 1 millimeter, which can not reach the use requirements. We cooperated with the heat treatment professionals to bend the outer edge of the disk by heating the induction coil, and then coated the sensing ring with a paste of resin, magnetic powder, etc. This will generate a shifting magnetic field when heated, which will increase the hardened depth of the hardened part of the top mold, and the depth of the hardenability can be more than 3 mm. Quenching process: the use of ordinary high-frequency quenching equipment, the platen can be placed on the mold can be rotated, and then the special induction ring and the top cover mold quenching position adjusted to a suitable position to stand still, start the power supply until the induction heating temperature reached When the quenching temperature is required, turn the mold frame and platen, and then quickly open the water spray switch with the special sprinkler. When turning the joint, turn off the water and then stop the water. Then perform the simple low-temperature tempering, the so-called high-frequency localization. Rotary quenching process.
This process has been used in the past for the quenching of the edge of the blanking die of the lid die stamping die. Nowadays, it has been applied to the repair of more than 40 pieces of platen and barrel flanging die. The effect is undoubtedly valuable for reducing the cost of making barrels.