Liebherr-International has been granted a patent for a tool used in press quenching and tempering methods for rotational symmetric workpieces, such as gear wheels. The tool is partially manufactured using additive manufacturing and includes at least one pipe for guiding a fluid. The tool also features cooling channels that allow for thermal transfer between the tool and the workpiece surface. The tool is designed to be couplable with at least two pieces. GlobalData’s report on Liebherr-International gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData, Liebherr-International's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Tool for press quenching and tempering rotational symmetric workpieces
A recently granted patent (Publication Number: US11680300B2) describes a tool for implementing a press quenching and tempering method for a rotational symmetric workpiece. The tool includes a mounting made from an additive manufactured part and at least one cooling channel within the additive manufactured part. The cooling channel is a clearance or recess defined by the additive manufactured part, and it allows for thermal transfer between the contact areas of the tool and the workpiece surface. Importantly, the cooling channel is configured with different angles at different portions, enhancing its effectiveness. Additionally, the tool consists of at least two pieces that can be coupled together.
The patent also covers a method for manufacturing the tool, which involves additive machining and optional stock removal machining. Furthermore, the patent describes a method for press quenching and tempering a rotational symmetric workpiece, such as a gear wheel, using the tool described in the claims.
Another aspect of the patent is a tool with at least one pipe formed in an additive manufactured part. The pipe is designed to guide a fluid and has different angles at different portions relative to the workpiece contacting surface. This tool can be manufactured as a single piece or as multiple pieces that can be coupled together.
Overall, this patent presents innovative tools and methods for press quenching and tempering rotational symmetric workpieces. The use of additive manufacturing in the tool's construction allows for complex cooling channel and pipe designs, enhancing the efficiency of the quenching and tempering process. The patent provides valuable insights for manufacturers and researchers in the field of heat treatment and rotational symmetric workpieces.