Guangming Group will talk about the molds for injection molding today

Injection molds are the core tooling for plastic part molding, classified into major categories based on structure, molding method, process, and product requirements. Below is a clear summary of mainstream mold types and applicable scenarios, which are in line with the actual industrial production.

1、 Classified by overall structure (most commonly used)

Two board mold (single parting surface mold)

The structure is the simplest, with only one parting surface. When opening the mold, the moving and fixed molds are directly separated, and the ejected product and gate waste fall off together.

Applicable: Ordinary simple plastic parts, large water inlet products, household appliance shells, daily necessities, precision universal parts, low cost, simple maintenance.

Three board mold (double parting surface mold)

There are two parting surfaces and an additional runner plate. When opening the mold, they are separated in stages, and the product and sprue material are automatically cut off and detached.

Applicable: fine water inlet/sprue feeding, high product appearance requirements, sprue storage, multi cavity precision parts, electronic small parts, appearance plastic shells.

hot runner mold

Cancel the traditional cold runner and install a heating system inside the runner. The plastic will always melt without any gate waste or subsequent glue cutting.

Applicable: Mass production, high appearance requirements, thin-walled parts, engineering plastics (PC/ABS/nylon), automotive parts, precision electronics, medical consumables.

2、 Classified by special molding function

Inverted mold

The ejector mechanism is located on the fixed mold side and is suitable for plastic parts with no ejector pin printing on the outer surface of the product and extremely high requirements for appearance mirror.

Row mold (slider mold)

The mold has a sliding core pulling structure, which solves the problem of product retraction, side holes, and side card slots that cannot be directly demolded.

Applicable: Complex plastic parts with internal and external buckles, charger housings, pipe fittings, and structural plastic parts.

Slant Top Mold (Slant Pin Core Pulling Mold)

Using a slanted top mechanism for small angle core pulling, the structure is smaller than the row position, suitable for small inverted buckles and shallow concave small parts.

Applicable: Small electronic components, precision connectors, thin-walled structural parts.

Core pulling mold

Including hydraulic core pulling, pneumatic core pulling, gear and rack core pulling, targeting deep holes, large side holes, and large inverted plastic parts.

3、 Classified by cavity count and production capacity

Single cavity mold: one the first mock examination, large pieces, large plastic parts (home appliance panel, car bumper), forming stable.

Multi cavity mold: the first mock examination with multiple cavities (2 cavities, 4 cavities, 8 cavities, 16 cavities or even 32 cavities), small pieces produced in large quantities, fasteners, terminals and bottle caps.

Stacked mold: Double layer/multi-layer stacked structure, doubling production capacity, suitable for small standard parts with low profit and high sales volume.

4、 Classified by process and material compatibility

Gas assisted injection mold

Built in air circuit, injecting high-pressure gas during injection molding to form hollow structures and thick walled parts, reducing shrinkage and weight.

Applicable: handles, pipes, thick walled household appliance structural components.

Two color/multi-color injection mold

Double barrel, rotating mold core structure, one-time molding of two different colors/materials of plastic parts.

Applicable: buttons, anti slip handle, dual color shell, wearable device accessories.

Embedded injection mold

Metal inserts, copper nuts, and hardware components are pre embedded in the mold, and after injection molding, the plastic is integrated with the inserts.

Applicable: Electronic wiring terminals, plastic structural components with nuts, and plastic parts for automotive hardware packaging.

Low temperature/special engineering material mold

Optimization of wear-resistant, corrosion-resistant, and high hardness mold cores for PA66, PBT, fiber-reinforced materials, and fuel blocking materials.

5、 Graded by accuracy and purpose

Ordinary injection molds: for daily necessities, packaging, and general plastic parts, with average precision.

Precision injection molds: electronic precision parts, connectors, micro structural components, high tolerance, mirror polishing.

Large injection molds: automotive interior and exterior, large household appliance shells, logistics pallets, strong mold frame rigidity, optimized cooling system.

Powder metallurgy, metal injection molding, powder metallurgy gears

Guangming Group focuses on the research and development of metal forming technology and wear-resistant materials. Its main products include metal compression molding and injection molding powder metallurgy products.

The company has a team of high-quality talents, with the founding team originating from the Guangzhou Nonferrous Metals Research Institute, a directly affiliated national and ministerial level scientific research institution. It has rich industry experience and research and development capabilities, providing a continuous source of innovation power for the company's development. The company has successively obtained 5 invention patents and more than 30 utility model patents. It has passed the IATF16949 quality management system, ISO9001-2015 quality management system, ISO14001 environmental management system, intellectual property management system, and obtained international trademark certification. It is an innovative enterprise in Guangdong Province, a small giant enterprise in science and technology in Guangzhou, a member of the Guangdong Powder Metallurgy Industry Technology Innovation Alliance, and an initiator of the Guangzhou Advanced Powder Metallurgy Cluster Promotion Center.