1. Material Cutting
   Use a bandsaw to cut standard-sized steel plates into rough blanks of the required dimensions.

2. Rough Milling (Face and Side Milling)
   On a gantry milling machine, mill the six faces of the plates (primarily the reference faces) to ensure flatness and achieve the basic outer dimensions, removing 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 Machining (Roughing)
   Use a rough cavity machine or gantry milling machine to preliminarily machine the mold cavity, guide pin/bushing holes, return pin holes, and other structural features, leaving a uniform finishing allowance for all areas.

5. Heat Treatment (Quenching and Tempering)
   [Critical Step] Perform quenching and high-temperature tempering on the roughly machined plates. This eliminates internal stresses from rough machining, homogenizes the steel, and improves its overall mechanical properties (strength, toughness), providing a stable material condition for subsequent finishing.

6. Precision Grinding of Reference Faces
   After heat treatment, the plates may experience slight deformation. This step involves grinding the two most critical reference faces (typically A and B faces) on a precision grinder to achieve extremely high flatness, surface finish, and accurate thickness, providing the sole and precise reference for all subsequent finishing operations.

7. Precision Milling
   Using the ground reference faces for positioning, perform precision milling on a gantry or high-precision milling machine to finish the four sides of the mold cavity, parting surfaces, shut-offs, slider slots, etc., ensuring 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, lifter holes, etc.), 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 perform tapping. This is typically done on a high-precision radial drill or CNC drilling machine.

10. Bench Work
    Perform manual finishing, including chamfering all edges, deburring, marking part numbers in specified locations, assembling standard components such as guide bushings and pins, and conducting waterline flow tests.

11. Final Inspection
    Use measuring tools such as coordinate measuring machines (CMM), height gauges, and calipers to fully inspect all critical dimensions, hole positions, flatness, etc., ensuring compliance with the design drawings.

12. Assembly and Packaging
    Clean all components, including front and rear mold cavities, guide pins, return pins, ejector plates, etc., assemble them, apply anti-rust oil, fasten securely, and package for shipment.

Changhui Company specializes in the R&D and manufacturing of mold bases for PPR pipe plastic molds, providing mold makers with high-precision, high-stability mold base solutions. Leveraging a deep understanding of industry challenges and continuous technological investment, we have become a trusted supplier to numerous partners.

• Company Scale: We have a workforce of over 100 employees, including a team of more than 30 experienced R&D engineers and over 60 CNC technicians, providing full-process technical support.

  
  

• Equipment Capability: Our facility is equipped with more than 60 production and processing machines, including 35 advanced CNC machining centers. Our large machining centers have a maximum working travel of X-axis: 3500mm, Y-axis: 2500mm, Z-axis: 1500mm. We also possess specialized equipment like deep-hole drilling machines capable of machining cooling channels up to 1450mm deep, making us adept at handling complex cooling systems.

  
  

• With an average monthly output exceeding 8 million units, we possess strong large-scale delivery capabilities, ensuring stable order fulfillment.

  
  

• Quality from the Source: We use custom mold steel known for its high hardness, excellent surface finish, and corrosion resistance. All steel materials undergo a 90-day natural stress relief process followed by strict spectroscopic and flaw detection tests before being put into production.

  
  

• Our advanced equipment and professional team jointly guarantee the machining precision of the mold bases, thereby ensuring the final product's molding quality.