High Pressure Lever for Sliding dies /Segmented tooling

May 17, 2012
The “High Pressure Lever”(HP lever) arrangement is used when spring pressure to the back of the sliding die case is required or preferred compared to the amount that can be obtained by springs within the die bore.

What is the High Pressure Lever? 
The “High Pressure Lever”(HP lever) arrangement is used when spring pressure to the back of the sliding die case is required or preferred compared to the amount that can be obtained by springs within the die bore. The arrangement consists of a gas spring mounted below the die block on a bracket. This spring drives a lever, which in turn applies increased spring load to the back of the die case. The HP lever has air and die coolant piped in constant flow for lubrication of lever contact and pivot areas, as well as a cooling unit for the gas springs.

What are the benefits?
More spring force equals better ability to form notches, grooves, and multiple upsets. The additional spring force also eliminates flash lines and mismatched features due to separation of segmented inserts under forming load. The lack of spring force also affected what size part can fit on a given size machine. For example, a 16mm diameter machine could only produce a 6mm part. While spring force will vary, testing shows that the HP Lever can generate a multiple of spring force compared to normal methods. In summary, the size, quality, and dimensional control of a particular part application is increased.

National Machinery LLC
Tiffin, OH USA 44883