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injection Mold Manufacturer in China
Looking for reliable molds for your next injection molding project? Stebro Mold specializes in designing and manufacturing high-quality production molds, prototype molds, unscrewing molds, collapsible core molds, molds requiring multiple slides and lifters, 2K molds, insert molds, and over molds for OEMs and plastic injection molding companies.
Injection Mold Making
Two Shot Mold
Insert Mold
Over Mold
Gas Injection Mold
Unscrewing Mold
Prototype Mold
Hot Runner Mold
MUD Insert Mold
Mass Production Mold
Why Stebro Mold for Plastic injection mold making
- Free Plastic Part Design Assistance
- Mold design optimize with Moldflow to improve the surface and reduce cost
- In-house Tooling Manufacturing
- Mold Life Guarantee, Free Mold Maintenance
- Affordable Price, No Hidden Charges
- Quality Control In Manufacturing, Consistent Quality
- 15 Days to Finish Mold
- 24-Hour Quote Responses With DFM Feedback
- In-House Tooling trial and part production
Customer Letters
Basic Injection Mold Knowleage
What is Injection Mold?
An injection mold is a tool used in manufacturing to create plastic parts by injecting molten plastic into a mold cavity under high pressure. Once the plastic cools and solidifies, the mold is opened, and the finished part is ejected.
Injection Mold Manufacturing processes step by step
- Product development and optimize
- Prototype to check the part
- Mold Design
- Moldflow to optimize the mold design
- Order the steel, Moldbase, and mold component
- Gun drilling for the cooling line
- CNC rough manufacturing on the cavity and core inserts, slides, and lifters
- Heat Treatment
- CNC fine manufacturing the cavity and core inserts, slides, and lifters
- EDM manufacturing
- Wire Cut manufacturing
- Fitting the mold
- Polish
- Assemble the mold
- Mold test
- Sample checking
- Mold improvement
Injection Mold Advantages
- Automation and high production rate
- Material and color Versatility
- Plastic material can be recycled, and minimal waste
- Consistent quality and high tolerance precision
- Flexibility design, Parts can be complex shapes
Injection Mold Disdvantages
- Initial tooling cost is high
- Limited flexibility after the mold is done
- Long lead time
Injection Mold Design key consideration
- Uniform wall thickness
- Draft angle optimization
- Cavity number based on part volume
- Steel material selection based on the plastic material, surface requirement, and part volume
- Gate system
- Efficient cooling design
- Venting and ejection system
- Easy Mold Maintenance
injection Mold steel
| Steel | Hardness | Properties | Plastic Material Applications | Surface Finish |
|---|---|---|---|---|
| H13 | HRC48-52 | Excellent toughness, wear resistance, and thermal conductivity. Maintains hardness at high temperatures. | PC, PMMA, PP, PE, PA+GF | SPI A1, A2, B1, B2 |
| S136 | HRC48-52 | Excellent corrosion resistance and dimensional stability. Good toughness, wear resistance, and polishability. | PC, PMMA, POM | SPI A1, A2, B1, B2 |
| NAK80 | HRC38-42 | Excellent dimensional stability, wear resistance, and mirror polishability. | PC | SPI A1, A2 |
| P20 | HRC28-32 | Good wear resistance, toughness, and machinability. Can be heat-treated for higher hardness. | ABS, PE, PP | SPI A1, A2, B1, B2 |
| P20H | HRC32-37 | Similar to P20, but with higher hardness and improved wear resistance. | ABS, PE, PP, PET | SPI A1, A2, B1, B2 |
Injection mold Manfaucturing Tolerance
The manufacturing tolerance for injection molds can vary depending on a number of factors, such as the complexity of the mold design and the materials used. However, in general, the tolerance for injection molds is typically within +/- 0.005 inches or +/- 0.01 mm.
It’s important to note that some features of the mold may require tighter tolerances, particularly if they are critical to the function of the final product.
In addition to manufacturing tolerances, it’s also important to consider the tolerance of the final product. This refers to the allowable deviation in the dimensions and features of the plastic parts produced from the mold. Understanding and controlling both the mold manufacturing tolerance and the part tolerance is crucial in ensuring high-quality injection molded parts.
Injection Mold Surface finish
| Polished | Textured | Machining Surface | Secondary Finishes |
|---|---|---|---|
| High Gloss Polish | Mold Tech MT-XXXX | EDM Surface | Painting |
| Technical Polish | VDI VDI3400CHXX | Milling Surface | Chrome Plating |
| YS YS-XXXX |
SPI Mold Surface Finishes
| SPI Finish | Manufacturing Method | Surface Roughness Ra | Typical Application |
|---|---|---|---|
| A1 | Grade #3 Diamond | 0.012-0.025 | Mirror Polish |
| A2 | Grade #6 Diamond | 0.025-0.05 | High Gloss Polish |
| A3 | Grade #15 Diamond | 0.05-0.1 | High Gloss Polish |
| B1 | 600 Grit Paper | 0.05-0.1 | Fine Semi Glossy Finish |
| B2 | 400 Grit Paper | 0.1-0.15 | Medium Semi Glossy Finish |
| B3 | 320 Grit Paper | 0.28-0.32 | Normal Semi Glossy Finish |
| C1 | 600 Grit Stone | 0.35-0.4 | Fine Matte Finish |
| C2 | 400 Grit Stone | 0.45-0.55 | Medium Matte Finish |
| C3 | 320 Grit Stone | 0.63-0.70 | Normal Matt Finish |
| D1 | #11 Glass Bead | 0.8-1.0 | Satin Textured Finish |
| D2 | #240 Aluminum Oxide Blast | 1.0-2.8 | Dry Textured Finish |
| D3 | #24 Aluminum Oxide Blast | 3.2-18 | Rough Texture Surface |
Plastic Injection Molds Cost
Tooling cost = Mold design cost + Steel material cost + mold base cost + mold components cost + Manufacturing cost + Mold Trial + Delivery cost
Injection mold application industry
- Automotive Industry
- Building & Constrution Industry
- Lawn & Garden Industry
- Consumer Industry
- Medical & Health Industry
- Agriculture Industry
- Industrial Industry
- Food and Beverage
- Electronics & Electrical Parts
Plastic Injection Mold Making Equipment
The process of making plastic injection molds requires specialized equipment and machinery to produce molds that meet the required specifications. Some of the key equipment used in plastic injection mold making include:
- Gun Drilling Machine
- CNC Machine
- EDM Machine
- Wire Cut Machine
- Lathe Machine
- Grinding Machine
- Mold fitting Machine
Plastic injection mold Resources
The Ultimate Guide to Hot Runner Injection Molding
What is a hot runner system in injection molding? A hot runner system in injection moulding is a set of heated parts within an injection
PEI injection molding – ultem injection molding processing guide
Table of Contents PEI resin PEI resins are a family of high-performance thermoplastic materials. It is known for their exceptional properties, such as high temperatures
PEEK injection Molding
Table of Contents peek resin manufacturers PEEK (Polyether Ether Ketone) is a semi-crystalline polymer belonging to the polyaryletherketone family. There are several PEEK polymer brands and
high temperature injection molding
Table of Contents high temperature injection molded plastics High performance plastics are specially designed to withstand extreme temperatures and maintain their mechanical properties. These materials are
injection molding surface finish
Table of Contents Surface finishes play a crucial role in the plastic injection molding process, impacting the appearance, functionality, and overall quality of the final
Ultimate Guide To Injection Mold Trial
Table of Contents Injection Mold Trial Injection mold manufacturers have to do the injection mold trial to test a new mold to make sure it