Ball Plunger Cold-Forming Near Net Shape
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Solution Overview
Problem
The manufacturing process of ball plungers for hydraulic lash adjusters is time-consuming and costly due to the need for extensive machining, which increases production costs and reduces efficiency.
Innovation Solution
A method of cold-forming a ball plunger blank using a multi-station cold-forming machine that shapes the plunger to near net dimensions, reducing the need for extensive machining by forming key features such as hemispherical surfaces, bores, and counterbores through a series of die and punch stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ball plungers are made in cold-forming machines and then machined to achieve desired final shape, then manufacturing precision is improved, but productivity deteriorates due to time-consuming machining processes
Solution Approach 1:
The cold-forming process performs preliminary shaping of the ball plunger to near-net dimensions before final machining. The multi-station cold-forming machine creates the basic geometry, bores, and hemispherical surfaces in advance, so that only minimal finishing machining is required afterward, thus improving productivity while maintaining precision
Solution Approach 2:
The manufacturing process is segmented into distinct stages: cold-forming at multiple stations for preliminary shaping, followed by minimal machining operations. This segmentation allows each process to focus on specific features, with cold-forming handling bulk material shaping and machining handling precision surfaces, thereby reducing total machining time
2Manufacturing precision
If extensive machining is used to achieve desired ball plunger shape, then manufacturing precision is improved, but loss of time increases due to multiple machining steps
Solution Approach 1:
The cold-forming process performs preliminary shaping of the ball plunger to near-net dimensions before final machining. The multi-station cold-forming machine creates the basic geometry, bores, and hemispherical surfaces in advance, so that only minimal finishing machining is required afterward, thus improving productivity while maintaining precision
Solution Approach 2:
The process changes the material state and forming parameters by using cold-forming with high plastic deformation to achieve near-net shapes. This allows the material to be shaped to close tolerances through forming rather than material removal, significantly reducing the time required for subsequent machining operations
3Ease of manufacture
If traditional machining processes are used for ball plunger manufacturing, then ease of manufacture is maintained, but productivity deteriorates due to high machining costs and time
Solution Approach 1:
Multiple forming operations that would traditionally require separate machining steps are merged into a single cold-forming process. The multi-station machine performs extrusion of bores, formation of hemispherical surfaces, and creation of counterbores in one continuous operation, eliminating the need for multiple separate machining setups and significantly improving productivity
Solution Approach 2:
The cold-forming machine is designed as a multi-functional device that can perform various forming operations (extrusion, hemispherical forming, counterboring) on the ball plunger blank in sequence. This universal machine replaces multiple specialized machining operations, maintaining ease of manufacture while dramatically improving production efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces machining time and costs by producing a ball plunger with near net shape, minimizing the need for additional machining steps and eliminating the requirement for seat inserts and seals, thereby enhancing manufacturing efficiency and reducing production expenses.
Implementation Method 1
A method of cold-forming a ball plunger blank using a multi-station cold-forming machine that shapes the plunger to near net dimensions
Implementation Method 2
extruding a first bore through the first end
Implementation Method 3
backward extruding a second bore at the first end
Data Source
AI summary
A method of cold-forming a ball plunger blank includes providing a slug having a generally cylindrical surface extending between a first end and a second end, transferring the slug to a first forming station, at the first forming station forming an indentation in at least one of the first and second ends, and rotating the slug and transferring the slug to a second forming station. The method further includes extruding a first bore through the first end while simultaneously forming a hemispherical surface at the second end, backward extruding a second bore at the first end, and forming a counterbore in the second end.