I. Positioning Hole Machining Process
1. High-Precision Coordinate Positioning: Positioning holes need to form a regular hole system (such as a grid distribution) on the platform surface, achieving a positional accuracy within ±0.05mm using a CNC machine tool or coordinate boring machine. During machining, a reference surface is used, employing double cylindrical pins for positioning and bolt fastening to ensure the consistency of the hole system coordinates.
2. Modular Hole System Design: The hole system is typically composed of straight holes (without bevels or T-slots), facilitating the quick installation of positioning pins (such as PC pins/locking pins). For example, the five surfaces of a 3D flexible welding platform are all machined with regular holes, supporting positioning at any angle.
II. Process Optimization and Error Control
1. Avoiding Positioning Gap: Using unidirectional feed (such as forward positioning) during machining reduces mechanical transmission gaps, controlling the hole spacing error to within 0.04mm.
2. Combined Rough and Finish Machining: First, drill small holes for positioning, then gradually enlarge the holes to the target size (e.g., 5mm screw hole → 10mm countersunk hole), ensuring the perpendicularity of the hole walls.
III. Surface Treatment and Functional Enhancement: After the positioning holes are completed, surface treatment (e.g., sandblasting, anodizing) is required to enhance wear resistance and corrosion resistance. For high-load applications, the hole edges can be locally hardened or plated (e.g., electroless nickel-gold) to increase hardness.
IV. Application Scenarios Adaptability
1. Flexibility Requirements: The hole system design supports rapid reconfiguration of fixtures, suitable for multi-variety, small-batch production.
2. High Rigidity Requirements: Through hole reinforcement processes (e.g., localized heat treatment), it can withstand the impact loads of welding heavy workpieces.
