Polycrystalline Diamond (PCD) Drawing Dies

Polycrystalline Diamond (PCD) Drawing Dies are designed for precision and continuous wire drawing applications where dimensional consistency, wear resistance and stable wire surface quality are critical.

Available in multiple PCD core sizes and die configurations, these dies can be customized according to wire material, incoming diameter, finished diameter, drawing reduction and production conditions.

Key Features

• PCD core for precision and continuous wire drawing

• Nominal wire diameter range from 0.013 to 16 mm

• Multiple PCD core sizes from D-6 to D-36

• Thermal stability options of 650°C, 700°C and 1000°C depending on model

• Custom bore diameter, reduction angle and bearing length

• Suitable for soft and hard metallic wires

• Suitable for single-pass and multi-pass wire drawing

• Customized according to wire material and drawing conditions

PCD Drawing Dies for Precision Wire Production

During the wire drawing process, metal wire is pulled through a precision die to progressively reduce its cross-sectional area and achieve the required final diameter.

The internal geometry of the drawing die directly affects drawing force, dimensional accuracy, wire surface condition and production stability.

PCD drawing dies are available for both soft and hard wire materials, including copper, aluminum, brass, stainless steel, nickel, molybdenum, tungsten and other metallic wires.

The die design can be adapted according to the wire material, required reduction, drawing speed, lubrication conditions and required finished-wire accuracy.

PCD Drawing Die Models and Core Specifications

Different PCD core sizes are available for different bore diameters and drawing conditions.

The appropriate model should be selected according to the required bore size, reduction angle, bearing length, wire material and production conditions.

Nominal wire diameter range: 0.013–16 mm.

Final PCD die selection should consider the PCD core model together with the bore diameter, wire material, reduction angle and bearing configuration.

Custom Bore Sizes and Die Configurations

PCD drawing dies can be supplied in different bore sizes according to the incoming wire diameter, finished diameter and drawing sequence.

Customization can include:

• Bore diameter

• PCD core model

• Reduction angle

• Bearing length

• Die outside diameter

• Die height

• Entrance and exit geometry

• Multi-pass die sets

Wire Materials and Applications

PCD drawing dies can be configured for different soft and hard metallic wire materials.

Stainless Steel Wire Drawing

PCD drawing dies can be used for stainless steel wire drawing where stable bore geometry, dimensional consistency and wire surface condition are important.

The reduction angle and bearing length should be matched to the stainless steel material, incoming diameter, reduction per pass and drawing conditions.

Typical applications include:

• Fine stainless steel wire

• Precision stainless steel wire

• Industrial stainless steel wire

• Multi-pass stainless steel wire drawing

Real Stainless Steel Wire Drawing Application

The following production footage shows a PCD drawing die used in an actual stainless steel wire drawing process.

It provides a practical view of continuous wire reduction under real production conditions.

Copper and Copper Alloy Wire

PCD drawing dies can be used for continuous drawing of copper and copper alloy wires.

Typical applications include:

• Copper wire

• Brass wire

• Copper alloy wire

• Copper-clad wire

• Electrical conductor wire

The die geometry can be adapted according to material ductility, drawing reduction and lubrication conditions.

Aluminum and Aluminum Alloy Wire

Aluminum and aluminum alloy wires require stable material flow and appropriate lubrication during drawing.

The entrance, reduction and bearing geometry can be adjusted according to wire diameter and reduction ratio to improve drawing stability.

Nickel and High-Strength Alloy Wire

PCD drawing dies can also be configured for harder wire materials including:

• Nickel wire

• Molybdenum wire

• Tungsten wire

• Iron wire

• Alloy steel wire

• Copper-clad steel wire

Different materials require different die geometries because their deformation behavior, hardness and drawing requirements vary.

PV Cutting Wire and Precision Fine Wire

Precision fine-wire applications require stable bore geometry and consistent final wire dimensions.

PCD drawing dies can be selected for applications where dimensional consistency and long-term die stability are important during continuous production.

Welding Wire

For welding wire production, stable wire diameter helps support consistent downstream feeding and processing.

PCD drawing dies can be configured for multi-pass welding wire production according to wire material and required finished diameter.

PCD Drawing Die Profile and Internal Geometry

A PCD drawing die is not simply a hole with a fixed diameter.

Its internal profile contains several functional zones that guide, lubricate, reduce, size and release the wire during drawing.

Entrance / Lubrication Zone → Reduction Zone → Bearing Zone → Exit Zone

Entrance and Lubrication Zone

The entrance section guides the wire into the die and helps align it with the die centerline.

The lubrication section helps carry lubricant toward the deformation zone.

Its main functions include:

• Guiding the wire into the die

• Improving entry stability

• Helping lubricant enter the die

• Reducing initial friction

• Supporting stable wire drawing

Reduction Zone

The reduction zone is the main deformation area of the drawing die.

The wire diameter is progressively reduced as the wire passes through this section.

The reduction angle influences:

• Drawing force

• Metal flow

• Friction

• Heat generation

• Wire surface condition

• Die wear

• Drawing stability

An excessively large or small reduction angle can both negatively affect the drawing process, so the angle should be matched to the wire material and reduction ratio.

Bearing Zone

The bearing zone controls and stabilizes the final wire diameter.

Its geometry influences:

• Final diameter

• Diameter tolerance

• Roundness

• Surface quality

• Friction

• Die wear

A bearing that is too long can increase friction and temperature, while insufficient bearing length may reduce dimensional stability.

Exit Zone

The exit zone allows the finished wire to leave the drawing die smoothly.

Correct exit geometry helps reduce:

• Wire scratching

• Wire vibration

• Contact with the die outlet edge

• Mechanical damage to the die outlet

Why Reduction Angle and Bearing Length Matter

Reduction angle and bearing length are two of the most important geometric parameters in a wire drawing die.

The final geometry should therefore be determined according to the complete wire drawing conditions rather than the finished diameter alone.

Recommended Reduction Angles for Different Wire Materials

Different wire materials require different deformation conditions.

The following values are engineering reference data for selecting the reduction angle according to wire elongation, shrinkage and material type.

Recommended Reduction Angle [α], Tolerance ±2°

Note: Actual reduction angles should be adjusted according to wire material, drawing speed, reduction per pass, lubrication and production requirements.

How to Select the Right PCD Drawing Die

Selecting a PCD drawing die requires more than choosing the required finished wire diameter.

1. Wire Material

Different metals have different deformation characteristics.

Copper, aluminum, stainless steel, nickel and alloy wires may therefore require different reduction angles and bearing configurations.

2. Incoming and Finished Diameter

Both the incoming wire diameter and required finished diameter should be provided.

For multi-pass drawing, the diameter sequence for each drawing pass is also useful.

3. Reduction per Pass

The amount of area reduction in each drawing pass influences drawing force, deformation and die geometry.

4. Drawing Machine

Machine configuration, number of passes and speed relationships between drawing stages should be considered when selecting a complete die set.

5. Drawing Speed

Drawing speed affects friction and thermal conditions and should therefore be considered together with lubrication and die geometry.

6. Lubrication

Wet drawing, dry drawing and different lubricant systems can require different die profiles.

7. Required Wire Accuracy

For precision wire production, provide:

• Diameter tolerance

• Roundness requirement

• Surface quality requirement

These parameters help determine the required bearing and finishing conditions.

Maximum Recommended Bore Size by Reduction Angle and Bearing Percentage

The maximum recommended bore size is influenced by the PCD core model, reduction angle and bearing percentage.

The following table provides engineering reference values for different PCD models.

Unit: mm

Selection Note

The figures above are engineering reference values for the PCD core itself. Final product selection should still be based on the required wire diameter and actual drawing process.

Precision Surface Finishing

The working cone and bearing area are critical wire-contact surfaces and require precision finishing.

A properly finished internal surface can help:

• Reduce wire-to-die friction

• Improve wire surface condition

• Improve dimensional stability

• Reduce unnecessary wear

• Support stable continuous drawing

Custom PCD Drawing Dies

Different wire materials and production lines do not necessarily require the same internal die geometry.

PCD drawing dies can therefore be customized according to:

• Wire material

• Incoming diameter

• Finished diameter

• Reduction per pass

• Drawing speed

• Lubrication

• Required tolerance

• Drawing machine

• Existing die dimensions

Available customization includes:

Bore Diameter · Reduction Angle · Bearing Length · PCD Core Model · Die OD · Die Height · Entrance Geometry · Exit Geometry · Multi-Pass Die Sets

Engineering Support for Multi-Pass Wire Drawing

Multi-pass drawing requires the complete drawing sequence to be considered rather than treating every die as an independent component.

Die selection may involve:

• Incoming wire diameter

• Final wire diameter

• Number of drawing passes

• Diameter at each pass

• Drawing machine speed ratio

• Reduction distribution

• Lubrication conditions

For multi-pass applications, customers are encouraged to provide the complete drawing sequence so that the die sizes can be evaluated as a system.

Information Required for Die Selection

Please provide:

• Wire material

• Incoming wire diameter

• Finished wire diameter

• Number of passes

• Diameter of each pass, if available

• Drawing machine type

• Drawing speed

• Wet or dry drawing

• Lubricant type, if available

• Required tolerance

• Required surface quality

• Existing die OD and height

PCD vs. Other Wire Drawing Die Materials

The appropriate die material should be selected according to wire type, diameter, drawing speed, production volume and required accuracy.

Frequently Asked Questions About PCD Drawing Dies

What is a PCD drawing die?

A PCD drawing die is a wire drawing tool using a polycrystalline diamond core. The wire passes through the precision die profile and is progressively reduced to the required diameter.

What wire materials can PCD drawing dies be used for?

PCD drawing dies can be configured for copper, aluminum, brass, stainless steel, nickel, molybdenum, tungsten, iron and various alloy wires.

What is the available wire diameter range?

The supplied product data gives a nominal wire diameter range of 0.013–16 mm.

Actual die selection should also consider the PCD core model and internal geometry.

How do I select the correct PCD drawing die?

Selection should consider:

• Wire material

• Incoming diameter

• Finished diameter

• Reduction per pass

• Reduction angle

• Bearing length

• Drawing speed

• Lubrication

• Required tolerance

Why is the reduction angle important?

The reduction angle determines how the wire deforms as it passes through the die.

An unsuitable angle can affect drawing force, friction, heat generation, wire surface quality and drawing stability.

Why is bearing length important?

The bearing section controls and stabilizes the final wire diameter.

A bearing that is too long can increase friction, while one that is too short may reduce dimensional stability.

Can PCD drawing dies be customized?

Yes. Bore diameter, reduction angle, bearing length, die dimensions and multi-pass die sets can be customized according to the wire drawing process.

Can you recommend a complete multi-pass die set?

Customers can provide the incoming diameter, finished diameter, drawing machine and drawing sequence so that the complete die configuration can be evaluated.