A method for manufacturing a large-scale forging with a defect-free inner step hole
By optimizing the mandrel structure and using the first and second cones to guide the bulge to stay on the large hole step, the defect problem at the junction of large and small holes during forging manufacturing was solved, thus improving the yield and product quality.
CN117340180BActive Publication Date: 2026-06-12SHANGHAI JIANING NEW MATERIAL TECH CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI JIANING NEW MATERIAL TECH CO LTD
- Filing Date
- 2023-10-25
- Publication Date
- 2026-06-12
AI Technical Summary
⚠Technical Problem
In the manufacturing process of large forgings with stepped holes inside, overlapping defects are prone to occur at the junction of large and small holes, resulting in a low yield.
⚗Method used
An optimized mandrel structure is adopted, including a second mandrel and a third mandrel, and a first cone and a second cone are set to guide the flared protrusion to stay on the large hole step, which is then removed by machining to avoid the formation of defects.
🎯Benefits of technology
This reduces defects at the junction of large and small holes in the inner stepped hole, improving the yield and quality of forgings.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN117340180B_ABST
Abstract
The application provides a large-scale forging with a defect-free inner stepped hole and a manufacturing method thereof, and relates to the technical field of forgings, and comprises the following steps: S1: punching a blind hole by using a first core rod; S2: punching a stepped hole blank at the bottom of the blind hole by using a second core rod; and S3: continuing to punch a hole downward in the stepped hole blank by using a third core rod, and finally forming a defect-free inner stepped hole. The structure of the second core rod and the third core rod is optimized, so that the skin bulge generated in the machining process is extruded and stays above the large hole step in the inner stepped hole, the skin bulge cannot be extruded into the forging body, the probability of defects is reduced, and the skin bulge staying on the large hole step can be removed through other machining methods subsequently. The core rod provided by the application has simple structure, simple operation method, and can reduce defects, and is beneficial to improving product quality.
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