GB/T 39170-2020 in English
VALIDTools for moulding—Centring sleeves
- Issued on:2020-10-11
- Implemented on:2021-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
| Standard No: | GB/T 39170-2020 |
| Document status: | VALID |
| Title in English: | Tools for moulding—Centring sleeves |
| Title in Chinese: | 成型模 空心定位销 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-10-11 |
| Implemented on: | 2021-05-01 |
| ICS Classification: | 25.120.30-Moulding equipment |
| Chinese Classification: | J46-Mould |
| Professional Classification: | GB-National Standard |
| Related Keywords: | hollow locating pin type b hollow
type b hollow locating pins type a hollow locating pins b-type hollow locating pins 4-8 locating pins |
| Related Topics: | hollow
molded vacancy positioning hollow semi-quantitative model positioning pin Centrosome Model GBT39170 GB/T 39170-2020 Limit pin position |
《GB/T 39170-2020成型模 空心定位销》由TC33（全国模具标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
| Comparison dimensions | Type A hollow locating pin | Type B hollow locating pin |
|---|---|---|
| Typical materials | GCr15 bearing steel | 45# carbon steel |
| Hardness range | 45-50HRC | 42-45HRC |
| Outer diameter specification (D1) | 18-320mm | 20-300mm |
| Fit tolerance | Hole H7 tolerance | g6/f6 clearance fit |
Key technical improvements
Compared with ISO9449:2007, this standard has made three important technical changes:
- A new series of B-type hollow locating pins has been added to meet the domestic mold industry's demand for low-cost locating components
- The wall thickness parameter of D1=32mm specification has been adjusted, and the inner diameter d has been changed from 25mm to 24mm, increasing the structural strength by 15%
- Material hardness requirements have been clarified, type A adopts GCr15+ quenching process, and type B adopts 45 steel quenching and tempering treatment
Typical application scenarios
In automotive injection molds, Type A hollow locating pins are often used for:
- Precision positioning of the fixed mold base plate and the fixed mold plate (matching accuracy ≤0.02mm)
- Multi-point positioning system for large molds (4-8 locating pins are required at the same time)
Type B hollow locating pins are more suitable for:
- Assisted positioning of the rapid mold change system
- Cost-sensitive applications of small and medium-sized molds
Implementation suggestions
1. Selection principle: Type A is preferred for precision injection molds, and Type B can be considered for ordinary die-casting molds
2. Installation specifications: When pressing the locating pin, the liquid nitrogen cooling assembly process should be used to avoid deformation caused by knocking
3. Maintenance points: Regularly check the wear of the locating surface, and replace it if it exceeds 0.05mm
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