Non-Standard Precision Casting & Finish Machined Parts Product Introduction

1. Product Overview

2. Production & Machining Process

2.1 Blank Process: Precision Casting

2.2 Full Finish Machining Flow

1. Blank Pre-treatment: The casting blank is cleaned of sand and sprue, and processed by stress relief aging to release internal casting stress and prevent deformation during finish machining and application.
2. Reference Leveling: CNC gantry and machining centers precisely mill reference planes and positioning datum to establish unified processing benchmarks for all working procedures.
3. Rough & Finish Profile Milling: Process complex outlines, multi-angle inclined planes, stepped surfaces, arc transitions and special cross-section grooves through rough milling and finish milling separately.
4. Precision Hole Machining: Complete assembly reference holes, threaded bottom holes and tapping to ensure coaxiality, position accuracy and assembly compatibility.
5. Precision Boring & Turning for Key Fitting Surfaces: Perform precision boring and turning on core assembly surfaces to strictly control geometric accuracy and fitting clearance.
6. Relief & Detail Forming: Adopt precision engraving to complete raised relief of logos, part numbers and cavity numbers.
7. Deburring & Finishing: Chamfer and deburr all edges to ensure no burrs or sharp corners.
8. Surface Polishing: Integral polished finishing achieves anti-corrosion, aesthetic and assembly requirements.
9. Full Quality Inspection: Fully inspect CTQ dimensions, geometric tolerances, surface appearance and assembly performance. All critical dimensions are controlled at the center of the tolerance range before delivery.

3. Core Machining Difficulties

1. Unstable Casting Blank Quality

   Stainless steel casting has special fluidity and shrinkage characteristics, easily causing blank deformation, porosity, sand holes and uneven allowance, which directly affects the benchmark and qualification rate of finish machining.
2. High Difficulty in Complex Special-shaped Structure Machining

   The product is equipped with multi-section inclined surfaces, arc transitions, stepped cavities and special-shaped grooves. Its irregular structure cannot be formed by one-time clamping on ordinary equipment, easily resulting in tool marks and contour deviation.
3. High Precision Requirement for Critical Fitting Positions

   Multiple core assembly positions are set as critical quality control points with strict standards for roundness, coaxiality, flatness and parallelism. Micro deformation is easily caused by cutting stress and clamping stress during machining.
4. Difficult to Guarantee Position Accuracy of Thread Holes

   Distributed mounting thread holes require accurate equal division, verticality and position degree. Slight deviation will lead to assembly misalignment of the whole equipment.
5. Difficult Balance Between Relief and Surface Technology

   Raised relief marks need clear outline and uniform height, while the finished surface must meet polishing standards. It is easy to produce edge burrs or damaged relief outline caused by over-polishing.
6. Hard-to-Control Machining Performance of Raw Material

   300 series stainless steel features high toughness, easy tool adhesion and severe cutting hardening. It causes large tool loss, vibration lines and unqualified surface roughness during processing.

4. Difficulty Solutions & Factory Process Assurance

1. Casting Blank Control Solution

   Custom dedicated casting molds and optimize pouring & cooling processes. Add casting flaw detection and full blank appearance inspection. Straighten deformed blanks and repair uneven allowance in advance. Equipped with stress relief aging treatment to completely release internal casting stress and avoid deformation in subsequent machining.
2. Optimization of Fixture & Machining Technology

   Custom integrated precision fixtures complete multi-surface and multi-angle processing in one clamping, reducing benchmark deviation caused by repeated clamping. Adopt 4-axis / 5-axis machining centers for linkage processing of special-shaped inclined surfaces and arc structures to avoid tool joint errors and ensure contour consistency.
3. Precision Dimension Control

   Finish machining adopts layered cutting with low speed and slow feed to reduce cutting heat and stress. Key fitting positions follow the process of roughing → stress relief → finish machining. All CTQ dimensions are strictly processed according to the tolerance center standard, with CMM, dial indicators and internal diameter gauges for full inspection.
4. Accurate Control of Hole Machining

   Apply CNC fixed-point programming and dedicated fixture positioning. Follow the process of drilling → reaming → precision tapping with unified benchmark positioning, ensuring excellent position degree, verticality and interchangeability of all thread holes.
5. Coordinated Processing of Relief and Polishing

   Use special engraving tools with controlled cutting depth to ensure clear relief edges without chipping. Adopt combined manual and mechanical segmented polishing, avoiding relief contour areas to maintain complete relief shape while ensuring overall surface smoothness.
6. Stainless Steel Cutting Process Adaptation

   Select special carbide tools for stainless steel, matched with professional cutting fluid and cooling system to restrain work hardening and tool adhesion. Optimize cutting parameters to reduce vibration lines and stably guarantee surface finish and dimensional stability.

5. Custom Service Advantages

Tel: +86 187 5714 8656
Email: zhouli@chinaliqin.com
WhatsApp: +86 187 5714 8656
Website: https://www.cncliq.com/