1. Material Cutting
   A sawing machine is used to cut standard steel plates into rough blanks of the required dimensions.

2. Rough Milling (Face and Side Milling)
   The six faces of the blank (primarily the reference faces) are milled flat on a gantry milling machine, achieving the basic outline and removing most of the machining allowance.

3. Drilling Lifting Eye Holes/Process Holes
   Screw holes (for lifting eyes), positioning dowel holes, and other reference holes for subsequent handling, transport, and alignment are drilled on a drilling machine.

4. Rough Cavity Machining (Roughing)
   A roughing machine or gantry mill is used to preliminarily machine the mold cavity, guide pin/bushing holes, return pin holes, and other structural features, leaving a uniform finish allowance for all areas.

5. Heat Treatment (Quenching and Tempering)
   【Critical Step】 The rough-machined plate undergoes quenching and high-temperature tempering. This relieves internal stresses from rough machining, homogenizes the material, and improves overall mechanical properties (strength, toughness), providing a stable condition for subsequent finishing.

6. Precision Grinding of Reference Faces
   After heat treatment, slight deformation occurs. This step uses a precision grinder to grind the two primary reference faces (typically A and B faces) to achieve extremely high flatness, surface finish, and exact thickness, establishing the sole, accurate reference for all subsequent precision machining.

7. Precision Milling
   Using the ground reference faces for positioning, the four sides of the mold cavity, parting surface, shut-off surfaces, slider slots, etc., are finish-machined on a gantry mill or precision milling machine to ensure perpendicularity, parallelism, and dimensional accuracy meet drawing requirements.

8. CNC Machining
   For complex shapes that cannot be completed by precision milling (e.g., free-form surfaces, deep cavities, 3D runner systems, angled lifter holes), computer programming is used for precision milling on a machining center (CNC).

9. Drilling and Tapping
   All screw holes, ejector pin holes, water line holes, guide pin holes, etc., are drilled and tapped. This is typically performed on a high-precision radial drill or CNC drilling machine.

10. Bench Work
    Manual finishing is performed, including chamfering and deburring of all edges, marking part numbers in specified locations, assembling standard components (e.g., guide bushings, dowel pins), and conducting flow tests on water lines.

11. Final Inspection
    All critical dimensions, hole position accuracy, and flatness are fully inspected using tools such as coordinate measuring machines, height gauges, and calipers to ensure compliance with the design drawings.

12. Assembly and Packaging
    All components—including front and rear mold plates, guide pins, return pins, ejector plates, etc.—are cleaned, assembled, coated with anti-rust oil, fastened, and packaged for shipment.

Changhui Company is a specialized R&D and production supplier focused on mold bases for automotive filter housings. We provide mold makers with high-precision, high-stability mold base solutions, serving as a reliable foundation for building quality molds.

• Deep Specialization: We have deep expertise in the mold base field for automotive filter housings, thoroughly understanding the industry's stringent requirements for precision, cooling efficiency, and stability.

  
  

• Scale Assurance: With over 100 employees and more than 60 pieces of production and processing equipment (including 35 advanced CNC machining centers), we possess strong capabilities for large-scale delivery.

  
  

• Advanced Technology: A professional team of over 30 engineering R&D personnel and more than 60 CNC technicians provides full-process technical support. We excel in machining complex cooling channels (water lines) using equipment like deep-hole drilling machines (capable of depths up to 1450mm).

  
  

• Strong Production Capacity: Our large machining centers offer a maximum working travel of 3500mm × 2500mm × 1500mm. With an average monthly output exceeding 8 million, we ensure on-time order delivery.

  
  

1. Material Excellence: We use customized mold steel. All steel materials undergo a 90-day natural stress relief process before machining, followed by spectroscopic testing and flaw detection. This ensures high hardness, corrosion resistance, and excellent surface finish, guaranteeing the longevity and stability of the mold base from the source.

   
   

2. Reliable Precision: Our advanced CNC equipment, operated by an experienced technical team, ensures high machining precision, laying a solid foundation for the final product's quality.

   
   

3. Stable Delivery: Our large-scale production capacity and mature supply chain management system reliably support our commitment to on-time delivery.

   
   

4. Expertise in Complex Structures: With specialized equipment and extensive experience, we are particularly adept at handling the intricate cooling channel systems found in automotive filter housing molds, helping customers improve mold cooling efficiency and production productivity.