"◆ Issues
In the case of casting, phenomena such as ""cracking"", ""breaking"", and ""scratching"" are likely to occur.
In addition, there are many inspection to do because inspection is not possible unless it is a finished product.
The problem is, if it was defective product, we need to remake it again from beginning.

◆ Our suggestion
We offered to change casting to hot forging.

◆ Improvement results
① A boost in strength
By performing hot forging, the strength of the product itself is increased, so there is no problem even if a Y-shaped rod is passed inside the cylinder.
In addition, highly accurate machining such as grooving become possible.
② Process reduction
The number of inspection processes was significantly reduced compared to the case of casting, which led to a reduction in the number of processes."