There are various kinds of precision mold parts, but the most used are just several types. Let’s look at some of the most used precision mold parts.

Cutting Punches and Dies

The Cutting Punches are the most used parts in the stamping punching mold.

A Punch and die set is a type of cutting tool used in the punching and forging process. it is a metal-forming process, some are used in the cold stamping mold, and some are used in the hot stamping mold. The difference is that cold stamping mold is usually used in parts within a thickness of 4mm.

cutting punches and dies set for stamping punching mold

This forming process needs a “punch” as a pusher on the cutting workpiece. These workpieces are usually the hardware metal parts, not the plastic parts. So the punch is also called “cutting punch”.

The die is a secondary part that the cutting punch pushes in.

Punch and die set is mostly used in the metal stamping punching mold.


Cemented Carbide Punches

As the punching production for the workpiece requires consistency and precision throughout every piece. So the punches usually need high hardness. The Hard alloy cemented carbide is a perfect choice, to be exact, cemented tungsten carbide punch is the best in small stamping punching mold use.

cemented carbide precision mold punch parts cemented tugnsten carbide punch mold parts

Cemented carbide punches can be used in the small electronics parts cold stamping mold. For example, connector and terminal mold, mobile phone and laptop computer mold, etc.


Cores and Cavities

Core and cavity sets are the machined metal parts used in Mold or Tooling for Injection Molding Machines or Pressure Die Casting processes. Especially mostly used in the plastic injection mold.

These two parts are designed with reference to the shape of the product. They ensure proper cavity space same as the product shape once assembled together. The melted material at certain viscosity will be poured inside & cooled to form the shape of the product once taken out.

Except for the main core and cavity set, there are also some of the mold inserts matched together, some of them called core sub-insert, cavity sub-insert and interchangeable mold inserts, etc.

core and cavity set in plastic injection mold cores and cavities mold parts

In the injection mold, The Mold can be divided into the upper mold and the lower mold, or called A-side mold and B-side mold. The core and cavity are separately installed (or called inserted) into the upper mold and lower mold.


Ejector Pins and Sleeves

Ejector pins are used to eject completed parts from die molds and are commonly used in plastic molds. The medical, automotive and consumer electronics industries are mostly used.

There are various shapes of the ejector pins. For example, straight ejector pins and stepped ejector pins, or called shoulder ejector pins.

ejector pins and sleeves mold parts ejector pins in plastic precision-mold

Some of the blade-shaped pins are called ejector blades.

ejector blade and steppted ejector pin

There are also some special-shaped ejector pins that need to be made in a custom machining way.

Ejector sleeves are hollow and can be used to protect and guide the pin, further enhancing its lifespan. Ejector sleeves also have various types: straight sleeves, one-stepped sleeves, multi-stepped sleeves, thin-walled sleeves, and sleeve extensions, etc.


Guide Pins and Bushings

Guide Pins and Guide Bushings are a set of mold parts used in an assembly mold to align mold components. Guide pins are usually cylindrical rod shapes. It can be regarded as the fastener to help ensure stability, limit contact damage, and maintain precise positioning in the injection molding process.

guide pins and guide bushings custom guide pins in plastic precision mold

Guide pins have the alignment function, so it called can be called “alignment guide pins” or “guide posts”.

Guide Bushing is used in conjunction with the guide pin, playing a guiding role. Guide bushings also perform a critical function by accurately guiding the mold parts to ensure more consistent and accurate performance.

There are various kinds of guide pins and bushings. For example, outer guide pins, inner guide pins, sub-guide pins, sub-guide bushings, stripper guide pins and stripper guide bushings.


Mold interlocks

In a plastic injection mold, we divide the mold into an upper mold and a lower mold, or as we mentioned above a core and a cavity. The upper mold and lower mold are often opened and closed. In order to ensure the precision of their closing, we usually add a mold interlock on the mold base.

custom mold interlocks parts

There are many kinds of mold interlocks, the commonly used types are side interlocks, tapered interlocks, and angled square interlocks, etc.


Hardware Components of Automation System

In an automation system, there are electrical parts and mechanical parts. Some of the hardware mechanical parts need high precision sizes. Such as Bearings, Couplings, Clutches & Brakes, Fasteners, Lock nuts, special-shaped precision parts, etc.

hardware precision automation components precision hardware automation system components

As the automation system is now widely used in various kinds of industries, it is also used in the mold-making process. For example terminal automatic assembly machines. Some of these automation parts are also a part of the precision mold parts.


Fixtures parts

In the mold production process, there may need some auxiliary jigs and fixtures, especially the fixture parts sometimes play an important role in the mold-making process. So there are also some precision fixture parts that can be used also as precision mold parts.

precision fixture parts precision fixture parts with black finish

At last, langdi Preicison is a professional manufacturer of various kinds of high-precision mold parts. Especially some of the micro precision parts used in the microelectronics industry, automotive industry and medical industry, etc.

How to classify precision mold parts


Published On: December 16th, 2022 / Categories: Technology /

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