Precision Mold Base Plates
Precision-machined mold base plates and structural components providing the foundation for injection and compression molds with tight flatness and parallelism.
| Materials | Carbon Steel, Alloy Steel |
|---|---|
| Processes | CNC Machining |
| Tolerance | ±0.005mm flatness |
| Standard | SPI / Hasco / LKM Standards |
Overview
Precision mold base plates are the structural foundation of every injection mold and compression mold. These plates locate and support the cavity inserts, core inserts, and ejection system while withstanding the full clamping force of the molding machine. Our mold base plates are machined and surface-ground to tight flatness and parallelism tolerances, ensuring the mold assembles correctly and seals properly under full tonnage.
We produce mold base plates in standard and custom configurations, including A-plates (cavity side), B-plates (core side), stripper plates, support plates, and ejector plates. Each plate is manufactured from pre-hardened tool steel for dimensional stability and machinability, then precision-ground on the critical mating surfaces.
Key Features
- Tight flatness control: Surface-ground to 0.005 mm flatness across the full plate surface
- Parallelism accuracy: Top and bottom surfaces held parallel within 0.01 mm
- Pre-hardened steel: P20, 4140, and A2 supplied at 28–34 HRC for stability and wear resistance
- Standard and custom configurations: Compatible with Hasco, LKM, DME, and custom mold base designs
- Guide system precision: Guide pin and bushing bores machined in a single setup for true positioning
- Surface finish: Ground to Ra 0.4–0.8 μm on mating surfaces for accurate insert fit
Manufacturing Process
- Material selection — Pre-hardened tool steel plate cut to rough size from certified stock
- Rough milling — CNC milling removes excess material and establishes the plate profile
- Stress relief — Thermal stress relief to stabilize the plate before precision machining
- Finish milling — All holes, pockets, and features machined to near-final dimensions
- Surface grinding — Precision surface grinding on mating surfaces for flatness and parallelism
- Guide system machining — Guide pin holes, bushing pockets, and locating dowels machined in a single setup
- Quality inspection — CMM verification of flatness, parallelism, hole positions, and surface finish
Specifications
| Parameter | Specification |
|---|---|
| Material | P20 (28–34 HRC), 4140, A2 tool steel |
| Max plate size | 800 × 800 mm |
| Plate thickness | 10–200 mm |
| Flatness | 0.005 mm across full surface |
| Parallelism | 0.01 mm between mating surfaces |
| Surface finish | Ra 0.4–0.8 μm (ground), Ra 1.6 μm (milled) |
| Hole position tolerance | ±0.01 mm on guide pin holes |
Applications
- Injection mold A-plates and B-plates for cavity and core mounting
- Two-plate, three-plate, and stripper plate mold assemblies
- Compression mold bolster plates for rubber and composite molding
- Die set retainers and holders for stamping and forming dies
- Custom mold bases for specialized tooling configurations
Request a quote for custom precision mold base plate manufacturing.
Related Mold Manufacturing Products
- Injection Mold Cavities — Precision injection mold cavities for tooling applications
- Conformal Cooling Inserts — Advanced conformal cooling inserts for cycle time reduction
