1. Saw Cutting (Blanking)
   Use a sawing machine to cut standard-sized steel plates into rough blanks of the required dimensions.

   
   

2. Rough Milling (Face Milling and Side Milling)
   On a gantry milling machine, mill and flatten the six faces (primarily the major reference surfaces) of the blank, shape the basic external dimensions, and remove most of the machining allowance.

   
   

3. Drilling Lifting Holes/Process Holes
   Drill screw holes (lifting holes) and reference pin holes on a drilling machine for handling, positioning, and subsequent processes.

   
   

4. Rough Cavity Milling (Rough Pocketing)
   Use a rough pocketing machine or gantry milling machine to preliminarily machine the mold cavity, guide pin/bushing holes, ejector return pin holes, and other structural features, leaving uniform finishing allowances for all areas.

   
   

5. Heat Treatment (Quenching and Tempering)
   [Critical Step] Subject the rough-machined plate to quenching and high-temperature tempering. This eliminates internal stresses from rough machining, homogenizes and enhances the steel’s overall mechanical properties (strength, toughness), and provides a stable material condition for subsequent finishing.

   
   

6. Precision Grinding of Reference Surfaces
   Heat treatment causes slight deformation. In this step, grind the two most critical reference surfaces (usually A and B faces) on a precision surface grinder to achieve extremely high flatness, surface finish, and accurate thickness, establishing a single, precise positioning datum for all subsequent finishing operations.

   
   

7. Precision Milling
   Using the ground reference surfaces for positioning, perform precision milling on a gantry or high-precision milling machine for the mold cavity’s four sides, parting surfaces, shut-off areas, slider grooves, etc., ensuring perpendicularity, parallelism, and dimensional accuracy meet drawing requirements.

   
   

8. CNC Machining
   For complex shapes beyond precision milling (e.g., contoured surfaces, deep pockets, 3D runners, angled lifter holes), use computer programming to perform precision milling on a machining center (CNC).

   
   

9. Drilling and Tapping
   Drill all screw holes, ejector pin holes, waterline holes, guide pin holes, etc., and tap them. This is typically done on a high-precision radial drill or CNC drilling machine.

   
   

10. Bench Work
    Perform manual finishing: chamfering and deburring all edges, stamping part numbers in specified locations, assembling standard parts like guide bushings and dowel pins, and conducting flow tests on waterlines.

    
    

11. Final Inspection
    Use measuring tools such as CMMs, height gauges, and calipers to conduct a full inspection of all critical dimensions, hole position accuracy, and flatness, ensuring compliance with the design drawings.

    
    

12. Assembly and Packing
    Clean all components (including front and rear mold cavities, guide pins, ejector return pins, ejector plates, etc.), apply anti-rust oil, assemble and tighten them, and pack for shipment.

    
    

Changhui Company specializes in the R&D and production of lunch box mold bases, dedicated to providing mold manufacturers with high-precision, high-stability mold base solutions. With a deep understanding of industry challenges and continuous technological investment, we have become a trusted mold base supplier to numerous partners.

• Company Scale: Employs over 100 staff, including an experienced engineering R&D and technical support team.

  
  

• Equipment Capability: Equipped with more than 60 production and processing machines, including 35 advanced CNC machining centers. Our large machining centers have a maximum travel of X-axis 3500mm, Y-axis 2500mm, and Z-axis 1500mm. We also possess specialized equipment like deep hole drilling machines capable of processing water lines up to 1450mm deep.

  
  

• Technical Team: Supported by a professional team of over 30 engineering/R&D personnel and more than 60 CNC technicians.

  
  

• Production Capacity: Average monthly output exceeds 8 million, demonstrating strong mass production and delivery capabilities.

  
  

1. Premium Materials: We use customized mold steel known for high hardness, corrosion resistance, and excellent surface finish. All steel materials are stress-relieved naturally for 90 days before use and undergo strict spectroscopic analysis and flaw detection testing.

   
   

2. Precision Guarantee: Advanced equipment and a professional team ensure high machining accuracy of the mold base, guaranteeing the final product's molding quality.

   
   

3. Stable Delivery: Mass production capacity and a mature supply chain management system ensure on-time order delivery.

   
   

4. Expertise in Complex Structures: Specialized equipment like deep hole drilling machines excels at handling the intricate cooling channel systems in lunch box mold bases.