Forked Shear Die Structure for Threaded Bolt Alignment
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Solution Overview
Problem
Existing shear test methods for threaded bolts are inadequate, as they do not effectively account for the unique geometry of threaded sections, leading to inaccurate measurements and potential damage to the test apparatus due to deformation of threads.
Innovation Solution
A system and method utilizing a shear die set with specialized sleeves and a cutter block to securely engage and align the threaded section of a bolt, minimizing bending forces and ensuring accurate alignment of the shear planes, thereby preventing damage to the test apparatus and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard double shear dies are used to test threaded bolts, then the test apparatus can be utilized, but the threads deform and the measurement precision deteriorates due to inadequate accommodation of threaded geometry
Solution Approach 1:
The patent introduces intermediary components (center sleeve, support sleeves, and fork structure) that mediate between the testing apparatus and the threaded bolt. These intermediary elements are specifically designed to engage with the threaded geometry, providing proper support and alignment while preventing direct contact between the standard shear dies and the threads, thereby preventing deformation and ensuring accurate measurement.
2Productivity
If standard shear testing is applied to threaded sections, then testing can be performed, but the test apparatus suffers damage due to thread deformation
Solution Approach 1:
The specialized fork structure with center sleeve and support sleeves acts as a protective intermediary that prevents the threaded bolt from directly contacting the standard shear dies. This intermediary system distributes the applied loads properly and prevents thread deformation that would otherwise damage the test apparatus, enabling reliable repeated testing.
Solution Approach 2:
The patent implements preliminary setup actions by pre-positioning the center sleeve, support sleeves, and fork structure before applying the shear test. This preliminary arrangement ensures that the threaded section is properly supported and aligned, preventing thread deformation and apparatus damage during the actual testing process.
3Measurement precision
If minimal bending is provided in the shear test, then measurement accuracy improves, but the device complexity increases due to specialized sleeve and fork requirements
Solution Approach 1:
The fork structure with integrated center sleeve and support sleeves serves multiple functions simultaneously: it provides support for the threaded bolt, ensures proper alignment of shear planes, prevents thread deformation, and maintains minimal bending conditions. By combining these functions into a single integrated structure, the patent reduces overall system complexity while achieving precise measurement.
Data Source
AI summary
A system having: a shear die set having a fork that includes first and second legs that are have grooves and are spaced from each other to define a test cavity; and a center sleeve that extends between the legs and is radially larger than the first leg groove, the center sleeve has an inner threaded surface and receives a threaded portion of the bolt; a first support sleeve having an inner threaded surface that receives a threaded portion of the bolt, and the first support sleeve has an outer diameter surface that fits in the first leg groove; and a second support sleeve having a same size and shape as the first support sleeve and receives a threaded portion of the bolt and fits in the second leg groove; and the outer diameter of the first support sleeve is different than the outer diameter of the center sleeve.