Carbide blanks and preforms to drawing
A carbide blank can have a simple geometry or already be very close to the final tool geometry. How far we pre-profile it depends on your manufacturing process, your machine park and the machining steps you want to carry out yourself.
Nadler manufactures carbide blanks, semi-finished products and near-net-shape preforms to drawing. Contours, steps, holes or other geometric features can already be added before sintering. This gives you exactly the delivery condition that suits your further machining – from the as-sintered blank with grinding allowance to the largely prepared semi-finished tool.
Blank, preform or semi-finished tool: the delivery condition makes the difference
These terms are not always used consistently in practice. Essentially, they describe different processing stages of a carbide part.
Blanks have a defined basic geometry and are supplied with the agreed machining or grinding allowance. Further shaping and finishing are carried out by the tool manufacturer or a specialized processor.
Preforms are near-net-shape blanks. Key contours and features of the final tool are already in place. As a result, significantly less material remains for subsequent hard machining.
A semi-finished tool blank is already largely prepared for its later purpose. Depending on the design, only individual functional surfaces, cutting edges, flutes or the final finish are missing.
Which stage makes economic sense depends on the geometry, the required tolerances and the available machining options. That is why we agree the delivery condition directly with you.
Near-net-shape preforms reduce the effort in hard machining
Due to its hardness, sintered carbide can only be machined with suitable processes and tools. Every unnecessary grinding allowance costs machine time, diamond tools and material.
A near-net-shape preform comes in earlier in the manufacturing process. Many geometric features are already created in the green state, in which the pressed carbide can still be machined easily. The subsequent sintering shrinkage is factored into the design from the outset.
This results in several advantages for your further processing:
- less material removal on the sintered carbide
- shorter grinding and machining times
- better utilization of your own precision machines
- less wear on abrasives and machines
- reproducible starting geometries for repeat orders
- cost-effective production of demanding special shapes
- lower material usage thanks to adapted allowances
Especially with complex tool blanks, a suitable preform can determine how efficiently the subsequent finishing runs.
Carbide blanks with geometries to drawing
In addition to simple round, rectangular or plate-shaped blanks, we manufacture special shapes to customer specifications. The geometry is matched to the final tool and the intended machining route.
Depending on the design, the following can already be created in the green compact:
- external and internal contours
- different diameters and steps
- holes and all kinds of threads
- grooves and undercuts
- chamfers and radii
- cooling channels
- centering features and clamping surfaces
- recesses and complex transitions
Green machining enables shapes that could only be produced with considerably more effort after sintering. At the same time, grinding allowances can be limited specifically to the surfaces that actually have to be brought to final dimensions later.
Tool blanks for different applications
Carbide blanks and preforms form the basis for numerous tools, wear parts and precision components. They are used wherever tool manufacturers want to determine the final geometry themselves but outsource upstream manufacturing steps.
Typical designs include:
- blanks for drilling, milling and reaming tools
- stepped blanks for rotationally symmetrical tools
- blanks for cutting and punching tools
- mold inserts and tool cores
- bushings, rings and sleeves
- plate and block blanks
- blanks for forming tools
- customer-specific special shapes
- prepared carbide inserts for composite tools
A blank made to drawing can also make sense for single parts, prototypes or small series. Complex geometries in particular benefit from powder preparation, pressing, green machining and sintering being coordinated with one another.
The carbide grade is matched to the final tool
A blank must already have the material properties that the finished tool will later need. Grain size, binder type and binder content influence, among other things, hardness, toughness, wear resistance and edge stability.
Fine-grained carbide grades are suitable, for example, for precise geometries and stable cutting edges. Coarser tungsten carbides with more cobalt can offer advantages under mechanically alternating or impact loads. Carbide grades with a nickel binder are also available for applications involving corrosive media.
Nadler prepares the carbide mixtures in-house and tests the batches in its own laboratory. The selection is based on the later application and the intended machining. You can find our available material grades and technical data in the overview of carbide grades.
From powder to preform under one roof
Production begins with a technical review of your drawing. We look at the geometry, the desired delivery condition, the machining allowances and the requirements of the final tool.
The individual manufacturing steps are then coordinated:
- Selection and preparation of the carbide mixture
- Compaction of the powder by axial or isostatic pressing
- Pre-profiling and machining in the green state
- Consideration of the material- and geometry-dependent sintering shrinkage
- Densification using the sinter-HIP process
- Testing of material properties and dimensions
- Optional grinding or final finishing
All key steps take place at Nadler's site in Odelzhausen. This keeps material, geometry and machining condition coordinated throughout the entire production process.
You can find a detailed insight into the individual work steps on our page on carbide manufacturing.
Grinding allowances are designed to suit further machining
Excessive allowances increase the grinding effort. Allowances that are too small can mean that final dimensions or surface requirements cannot be reliably achieved. The right design must therefore take geometry, sintering shrinkage, tolerances and the subsequent machining process into account together.
We agree with you which surfaces can remain as-sintered and where a defined grinding allowance is required. Different allowances within one part are also possible, provided the geometry and manufacturing process allow it.
The result is a blank that offers enough scope for finishing while avoiding unnecessary material removal.
Quality testing for reproducible tool blanks
Blanks and preforms are the basis for all subsequent machining steps. Deviations in material, shrinkage or starting geometry would carry through the entire further production.
That is why we test the relevant material properties of every batch in our own laboratory. Depending on requirements, we record hardness, density and microstructural features, among other things. Dimensional inspections accompany production until the parts are released.
For repeat orders, documented production data ensure that carbide grade, geometry and machining allowances can be reproduced.
What information we need for your carbide blank
A technical drawing is the best basis for review and calculation. Information on the later application and the planned further machining is also helpful.
For a specific inquiry, we ideally need:
- drawing or CAD data
- required quantity
- intended carbide grade or information on the application
- desired delivery condition
- relevant dimensions and tolerances
- required grinding or machining allowances
- functional surfaces that need to be marked
- planned machining steps at the customer's site
If there is no finished drawing yet, a sketch, a sample or existing component data can also serve as an initial basis. Together, we clarify which geometries can already be included in the preform and which areas should remain open for your own machining.
Carbide blanks and preforms from Nadler
We manufacture carbide blanks, semi-finished products and preforms to drawing from a batch size of 1. Our depth of production ranges from in-house powder preparation, pressing, green machining and sinter-HIP to optional finishing.
You decide at which point you take over the blank. We make sure that material, geometry and machining allowances fit your further manufacturing process.
Request a carbide blank or preform
Do you need a blank with a defined grinding allowance or a near-net-shape preform to drawing? Send us your documents. We will review geometry, material and possible delivery condition and coordinate production directly with you.
Frequently asked questions about carbide blanks and preforms
A carbide blank is a pressed and sintered starting part for further machining. It is supplied in a defined basic shape and, depending on requirements, with a grinding or machining allowance.
A preform is a near-net-shape carbide blank. Key features of the final geometry are already created before sintering. This reduces the effort required for subsequent hard machining.
A blank usually has a basic starting shape. A semi-finished tool is already more closely adapted to the final tool and contains additional contours or functional features. The exact delivery condition is defined on the basis of the drawing.
Near-net-shape preforms reduce material removal on the sintered carbide. This lowers grinding time, machine occupancy and tool wear during further machining.
Depending on the part and the pressing process, steps, holes, grooves, chamfers, radii, cooling channels and complex external contours, among other things, can already be produced in the green state.
Yes. Grinding and machining allowances are matched to the geometry, the required final dimensions and the subsequent machining process.
Yes. Blanks, preforms and custom parts made to drawing can be manufactured from a batch size of 1.
The range extends from wear-resistant fine-grained grades to tougher grades for alternating loads. Materials with a nickel binder are also possible for corrosive applications. The specific selection depends on the later application.
Yes. On request, we carry out further machining steps such as grinding, EDM, lapping, honing or polishing through to the ready-to-use precision part.
Ideally, send us a drawing with the quantity, desired delivery condition, tolerances and machining allowances. Additional information on the application helps in selecting the right carbide grade.
