| 摘要 |
PURPOSE:To improve the mechanical property of a product and to make the lever part light-weighed by casting the stock in the shape approximate to a connection rod, then, performing a thinning it with plastic work after rising the temp. of the lever part. CONSTITUTION:The stock 11 having the shape approximate to the product connection rod and quipped with a rod part 14 is cast with an ordinary casting method. The rod part 14 only is then subjected to a temp. up to the prescribed temp. by using a high frequency heating device, etc. and a plastic working by forging is performed by the stationary dies 15u, 15l, movable dies 16l, 16r equipped with two pairs of springs 17a, 17b, 18a, 18b. Owing to a quick solidification speed at the casting time and the thinning due to the forging the mechanical property is improved with this method and the rod part 14 can be made light- weighted. |
