Full Service Custom Injection Molding Supplier in China

Save Money With an Injection Molding Company That Helps You Design For Manufacturing.

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.

The entire development process from the initial design meeting to the delivery of your finished mold relies on meticulous engineering and planning. We do not just take a customer’s product drawing or 3D part design verbatim and build a mold. Our responsibility is to take ownership of that mold, so we have to critique it, go through our customer’s requirements, and obviously make suggestions if we see potential issues or if we can make enhancements.

We do a lot of parts sampling, troubleshooting and mold validation. When we build new molds, we want to ensure that they go to our customer’s facilities without any issues for a smooth transition to production. Validation services can include PPAP, first article inspection, design of experiments, IQ/OQ/PQ process validations, factory acceptance tests, and more.

Contact us for your next plastic injection mold project. Our promise to you is optimized cycles, quality parts, and low maintenance!!!

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

on-time delivery, world-class craftsmanship and a fair price

Customer Letters

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Amanda Lee

CEO & Founder Crix

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Catherine Gilbert

Director at Initech

One-stop solution for Plastic Part from part design to final Delivery

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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

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