What materials are commonly used in injection molding?

Common materials include ABS, PP, PC, PA (nylon), POM (acetal), HDPE, LDPE, and specialized engineering plastics. The choice depends on application requirements for strength, heat resistance, chemical compatibility, and cost.

What causes defects like sink marks and warpage?

Sink marks are typically caused by uneven cooling or insufficient packing pressure. Warpage often results from uneven shrinkage due to material orientation, cooling rates, or mold design issues.

How to fix injection molding problems like flash or short shots?

Flash (excess material) is usually fixed by adjusting clamping pressure or mold alignment. Short shots (incomplete filling) can be resolved by increasing injection pressure, temperature, or flow rate.

Introduction

This case study presents one of our automotive injection mold projects, focusing on a high-precision dashboard plastic component mold.

The project required strict dimensional accuracy, excellent surface finish, and stable mass production performance for long-term automotive use.

Our engineering team provided full mold design, manufacturing, and testing support from concept to final production.

🟦 H2：Project Overview

📌 Industry:

Automotive Interior Components

📌 Product:

Dashboard plastic housing component

📌 Mold Type:

High-precision injection mold

📌 Material:

ABS engineering plastic

📌 Requirements:

High dimensional accuracy
Smooth surface finish
Long mold life
Stable mass production

🟩 H2：Customer Challenge

The client faced several key challenges:

Complex curved surface design
Strict automotive tolerance requirements
Risk of warpage during cooling
Need for high-volume production stability

👉 The biggest challenge was maintaining consistency in mass production.

🟥 H2：Our Engineering Solution

To solve these challenges, our engineering team implemented:

✔ 1. Advanced DFM Analysis

We optimized the product structure before mold manufacturing to reduce risk of defects.

✔ 2. Optimized Mold Flow Design

Balanced gate positioning to ensure even material flow and reduce weld lines.

✔ 3. Precision Cooling System

Designed efficient cooling channels to reduce warpage and improve cycle time.

✔ 4. High-Quality Mold Steel Selection

Used hardened steel suitable for long-term automotive production.

🟨 H2：Manufacturing Process

The mold was manufactured using:

CNC high-speed machining
EDM precision processing
Wire cutting for complex structures
Manual polishing for surface finish

👉 Each step was strictly controlled under ISO 9001 quality standards.

🟪 H2：Mold Testing (T1 Trial)

During the first trial (T1):

Injection flow was stable
No major flash or short shot issues
Minor adjustments were made to gate balance

👉 After optimization, the mold achieved stable production performance.

🟫 H2：Final Results

The final mold delivered:

High dimensional accuracy
Excellent surface finish
Stable mass production capability
Long mold life performance

👉 The client successfully moved into mass production without delays.

⬛ H2：Key Advantages of Our Solution

✔ Precision CNC & EDM machining
✔ Experienced automotive mold engineering team
✔ Full DFM optimization before production
✔ Strict ISO 9001 quality control
✔ Fast delivery and stable performance