Cam Driving Device for Non-Circular Bore Processing
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Solution Overview
Problem
Existing methods for processing non-circular bores, such as those in cylinder blocks, face challenges in achieving high precision and consistency due to deformation issues when dummy heads are detached, leading to increased sliding resistance and reduced productivity.
Innovation Solution
A cam driving device with a cylindrical member, rotational shafts, and a tool that adjusts its protrusion amount based on a data table associating rotational angles with protrusion amounts, allowing for precise processing of non-circular bores by synchronizing the rotational speeds of the shafts and adjusting the phase of the rotational angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bore is processed to have a desired elliptical cross-section, then the clearance between the bore and piston is optimized, but the bore shape deforms when the cylinder head is assembled, increasing sliding resistance
Solution Approach 1:
The invention processes the bore to have a non-circular cross-section (different from the final desired elliptical shape) as a preliminary step. This preliminary shape is intentionally designed to transform into the desired elliptical shape after the cylinder head is assembled, thereby preventing deformation and maintaining shape stability during engine operation.
Solution Approach 2:
The invention applies preliminary anti-action by processing the bore with a specific non-circular shape that pre-compensates for the deformation that will occur during assembly. This preliminary shape is calculated to counteract the expected deformation, ensuring that the final shape after assembly matches the desired elliptical cross-section.
2Manufacturing precision
If a dummy head is attached and detached for each bore processing, then the bore can be processed with the desired shape, but productivity is greatly reduced
Solution Approach 1:
The invention extracts and eliminates the dummy head from the processing system. Instead of using a dummy head to define the bore shape, the invention directly processes the bore with a predetermined non-circular cross-section using a processing device with a controlled tool projection amount, thereby removing the time-consuming attachment and detachment steps.
Solution Approach 2:
The invention replaces the mechanical dummy head system with a controlled processing system that uses a processing device to directly machine the bore with the desired non-circular shape. This substitution eliminates the need for physical dummy heads and their associated attachment/detachment operations.
3Manufacturing precision
If the cutting tool projection amount is not accurately controlled at each measurement point, then the bore cannot achieve the desired ideal elliptical shape, but accurate control increases process complexity
Solution Approach 1:
The invention changes the control parameter from complex multi-dimensional tool positioning to a simplified one-dimensional tool projection amount control. By controlling only the projection amount of the cutting tool in the radial direction at each axial position, the system achieves accurate non-circular bore shaping without requiring complex control systems.
Solution Approach 2:
The invention applies local quality by controlling the tool projection amount specifically in the radial direction at each measurement point along the axial line, rather than controlling the entire tool positioning system. This localized control approach simplifies the overall control system while achieving the desired precision.
Data Source
AI summary
A cam driving device for a processing device including a cylindrical member, a rotational shaft that has a mount hole formed on the outer peripheral surface thereof, a cam, and a tool that is mounted in the mount hole of the cylindrical member so that the tool can be protruded and retracted through the mount hole in a radial direction of the rotational shaft in accordance with a profile of the cam. The cylindrical member and the rotational shaft are axially reciprocated to process a non-circular bore, including a storage unit for storing a data table representing associating relationship between a rotational angle of the cam and a protrusion amount of the tool which is provided on the basis of the rotational angle of the cam, and a controller for advancing or retarding the rotational angle of the rotational shaft according to the data table stored in the storage unit.