Custom Grinding Solutions: Tailored for Your Needs

“The machined or manufactured parts often require additional processing, like metal grinding. It helps to customize the sharp edges and remove the deburrs, machining marks, attached chips, or other imperfections.”

The process of custom metal grinding machining involves rubbing the abrasive wheel or belt against the work metal. It is also renowned as abrasive cutting among the manufacturers, as the grinding wheel is sometimes used to cut the metals. 

This article will explore Custom Metal Grinding in-depth, elaborating on the involved equipment, tooling,  innovation in Accurate Grinding, and many more aspects.

What is Precision Metal Grinding?

First, What is Precision Grinding? It is a finishing technique that effectively removes attached or excess materials from manufactured items, like CNC-machined, die-cast, or metal-fabricated parts.

The use of grinding in metal parts mainly has three functions, achieving the desired finish level, removing the burrs, and preparing the surface for further finishes like polishing, painting, or electroplating.

Unlike other machining, metal grinding uses abrasive grains in the wheel surface. These abrasive media cut and remove unnecessary materials while moving the workpiece back and forth on the wheel. 

Table 1: Precision Grinding

The Custom Metal Grinding

In many cases, the standard grinding machine or wheel can not finish the complex geometries with the intricate features. Here comes the role of Custom Metal Grinding in those cases. It is different from regular ones as it involves specialized control over the process. This approach is mainly used for grinding complex parts or components, requiring tight tolerances and a lower roughness level.

The material flexibility is another perk of customization, the custom grinding can finish any Machinable Material Options for CNC Machines, even the hard ones like titanium or tool steel. 

Moreover, custom grinding demands Custom Grinding Equipment and tools to execute the operation.

• Wheels with specific grins and custom size.
• Custom jigs & fixtures
• CNC control of wheel and workpiece movements.

Types of Precision Grinding Techniques

There are various types of precision grinding techniques, and it is vital to use the proper technique for a machining process to achieve the best results. Explained are a few of these methods:

Centerless Grinding

This grinding method is suitable for working on long and tiny workpieces such as bars or tubes. This is because, unlike other precision grinding techniques, it doesn’t hold the workpiece in a stationary place. Instead, it uses a blade to support the workpiece while it grinds its external circumference. Also, centerless grinders use two wheels: the abrasive grinding wheel and the regulating wheel. These two wheels move at different speeds, with the abrasive precision grinder moving faster than the regulating grinder.

Single and Double Disc Grinding

As the name implies, single and double disc grinding uses single and double discs. For single-disc precision grinders, the spindle usually holds the disc vertically while the chuck clamps the workpiece to a position. The double discs grinders come in both vertical and horizontal types, with both capable of various precision grinding applications.

Cylindrical Grinding

Cylindrical grinding is also referred to as center-type grinding. This process uses grinders that comprise a precision grinding wheel, two centers for holding the workpiece, the chuck for driving the workpiece, and some other features. The grinding disc and the workpiece rotate in different directions, making chip removal easy. There are two types of cylindrical grinding, and they include:

Internal Diameter Grinding

The internal diameter grinding technique removes excess materials from the internal diameter of holes, tubers, or bores. In this process, the centers hold the workpiece in a stationary spot, and the chuck rotates it to reduce the diameter of the workpiece.

Outer Diameter Grinding

The outer diameter grinding functions in grinding the external surface of workpieces. The centers hold the workpiece in place while the chuck rotates it in the same direction as the disc to allow fine grinding.

It is vital to mention that the parts must be cylindrical for either of these techniques to be suitable for grinding.

Surface Grinding

Precision surface grinding is a precision grinding technique used to finish flat surfaces. The setup consists of a grinding wheel positioned perpendicular to the workpiece, held in place by a magnet. The magnet used can either be a permanent magnet or an electric magnet.

This technique is suitable for magnetic materials that are grindable and do not block the grinding wheel. Examples of such materials are steel and cast iron. However, other metals like brass and aluminum usually block grinding wheels.

Applications of Precision Grinding

Due to the intricacy of precision grinding, precision grinding applications spread across many industries that require carefully produced and high-quality parts. Examples of these industries include:

Aviation Industry

A Turboshaft engine

Many aircraft parts require careful production and strict adherence to dimensions. A good example is the plane’s turboshafts, which serve as an emergency source of power in the case of engine damage and require the precision and consistency that precision grinding offers.

Automotive Industry

A cylinder head

Many car parts, especially their engines, require parts specifically made for the car. These parts have to be made to fine dimensions, or it might cause issues in the vehicle. An example of car parts that require precision grinding is its cylinder heads. Although milling is the typical technique used for making these cylinder heads, precision grinding is also suitable due to the efficiency of the process.

Electrical Industry

A semiconductor wafer

The electrical industry is another field that requires precision-machined parts. Examples of electrical components that need precision grinding are semiconductor wafers, which use precision grinding to manufacture the optical films used in these wafers.

Equipment Used in Custom Metal Grinding Solutions

Several equipment and tools are essential to achieve the intended metal grinding solution. It means intended finish quality( Ra level), tolerances, and manipulation of edges & corners. The common equipment are CNC grinding machines, jigs & fixtures, inspection tools, and a cooling system.

Here are the details of all metal grinding tools and equipment.

1. The CNC Grinding Machines

A grinding machine is the primary equipment you need for metal grinding projects. It contains different components and mechanisms to handle the related tasks. 

CNC grinding machines are the most popular for grinding the parts based on custom needs. These machines automate the process and can be easily controlled with digital instructions.  

Custom grinding wheel 

The CNC system controls the movement and speed of the wheel. It also positions the workpiece into the correct coordinates for grinding. Once the wheel starts to rotate, it contacts the workpiece and removes the unwanted material through abrasion. Meanwhile, the coolant system prevents overheating while the wheel rubs the workpiece surface.

Table: Components of a CNC Grinding Machine 

2. Custom Fixtures and Jigs

First, the jig & fixtures are responsible for holding the metal piece or part to be ground. It mainly provides solid stability for grinding operation, which is important for the desired result as the loose holding can cause the workpiece deflection. But why the custom jigs & fixtures? The customization is for unique shapes and geometries that standard fixtures cannot hold. Often, CNC machining is applied to create custom jig fixtures for custom grinding projects.

CNC grinding jigs and fixtures

Furthermore, consider other aspects of Custom Grinding Tooling, such as does the grinding wheel can access all surfaces of metal pieces, or the coolant flow mechanism. 

For instance, surgical instruments contain intricate features of shapes. Here, the custom fixtures are best to ground the components perfectly.

3. The Abrasive Layer on the Wheel Surface

The layer of abrasive on the wheel’s surface executes the grinding operation. So, you can imagine how critical is the correct customization of the abrasive layer. You must choose the abrasive media or material according to the specific need of the particular grinding project. Next, the grain size of the abrasive also differs based on the volume of material you want to remove from the surface.

Abrasives for Metal Grinding  

• Some of the options are;
• Aluminum oxide
• Cubic boron nitride
• Silicon carbide, etc

The grit number is the gauge measure of the grain size of the abrasive. It typically ranges from coarse (low numbers, such as 24-60) to very fine 600+

4. Dressing Tools for Custom Grinding

You can refer to these as wheel maintenance tools. They are responsible for keeping the abrasive surfaces of custom grinding wheels perfect for the operations.

Over time, they can become clogged with metal particles, or their cutting edges can become worn. So, it can affect the performance, accuracy, and surface finish. Here, the dressing tools restore the wheel’s shape and expose fresh abrasive grains for subsequent grinding cycles. 

Example of Custom Metal Grinding: An Automotive Cankshaft

The automotive crankshaft needed to be ground after manufacturing it with any technique, forging, casting, or machining. This post-process removes the excess materials and helps to achieve the specifications required for its functionality.

Automotive crankshaft 

Next, why does it need the Custom Metal Grinding? The answer is very simple. Regular or standard grinding can not interact with all surfaces of the crankshaft. Therefore, it is hard to achieve a uniform result without the custom grinding approach.

Let’s elaborate on this specific example of custom grinding in brief;

1. Grinding Machine

The manual and other traditional grinding machines are not feasible for crankshaft grinding. Instead, the CNC Metal Grinding machine is highly preferable for this application. The CNC integration controls even the minor parameters for accuracy and also allows to grind the complex parts like crankshafts.

2. Abrasive Wheels for Crankshaft Grinding

Next, materials like cubic boron nitride (CBN) or aluminum oxide are used on the surface of the grinding wheel as an abrasive medium for grinding. It is because the high abrasiveness of these mediums can finish the hard crankshaft’s materials like forged steel or cast iron.

Note: Wheel size and grit number depend on specific requirements and other aspects of the crankshaft. 

3. Coolant Mechanism for Crankshaft Grinding 

The cooling of the grinding area during the process is necessary to counter the generated heat and lubricate the surface. So, coolant systems are vital. Typically, the coolant is a mixture of water and oil.

4. Dressing Tools

Dressing tools maintain the working condition of the grinding wheel in case of any damage to the grains of abrasive media. Typically, single-point or double-point diamond dresser.

5. The result of Crankshaft Custom Grinding

• Dimensional accuracy as intended( ± 0.0005-0.001”)
• Smooth Finish ( as low as 0 .025 µm) 

So, the crankshaft becomes smooth and accurate for the initial design or intended specifications after the custom grinding. So, it can seamlessly convert the linear motion of pistons into rotational motion to turn the vehicle’s wheels.

Read More: Exploring Diverse Applications of Surface Grinding

What are the Advantages of Custom Metal Grinding?

• It achieves tight tolerances, which is how pars can meet specific dimensional and surface finish specifications.
• The grinding grinding process helps to reduce friction and wear in moving parts.
• Next, a better surface finish with custom grinding is also essential for durability, aesthetics, and functionality.
• Metal grinding is compatible with hard-to-machine metals and complex shapes.
• Customization in metal grinding optimizes the process of production efficiency and material wastage.
• It often eliminates additional finishing processes and saves time and costs.
• Custom grinding is cost-effective at high volumes due to the precision and speed of the process.

Precision Grinding Innovations in Manufacturing

The reason behind custom grinding’s exceptional capabilities is Precision Grinding Innovations in grinding machines, abrasive tools, work holding, and parameter optimization. 

Custom Precision grinding operations

These latest innovations are significantly advantageous for precision. They can provide nanometer-level finishes and are compatible with metals with high hardness levels. For example, nano-finishing is essential for the finishing of optical applications.

• Electrochemical Grinding (ECG): This method uses a rotating wheel and electrolytic fluid for anodic dissolution. It’s especially effective for hard-to-machine materials.
• High-Efficiency Deep Grinding (HEDG): It allows high feed rates and cutting speeds for faster removal.
• Cryogenic Grinding: This  Grinding Innovation employs liquid nitrogen to cool both the material and grinding wheel to prevent heat-induced deformations.
• Laser-Assisted Grinding: This involves preheating the workpiece with a laser before grinding to soften the material and reduce tool wear. 

Custom Metal Grinding and Further Finishing at ProleanTech

As customization influences the precision grinding result, we focus on everything from material type to the desired result to meet your specifications at ProleanTech

Whether CNC machining, sheet metal, cast, or forged metal parts, our metal grinding, and further surface finishing services can cater to our dimensional and finish requirements. We have all advanced equipment and expert engineers working on surface treatment projects for a decade! 

So, upload your design and kick-start your project to leverage our surface finishing facilities and expertise.

Summing Up 

The customization of metal grinding enables the finishing of custom and unique geometries that the standard process can not. Adjusting the grinding tooling and abrasive parameters like grit number or layer thickness can achieve the desired Custom Metal Grinding result.

Thus, ensuring the proper custom grinding equipment, tooling, abrasive selection, and parameter optimization gives the flexibility to grind countless metal parts or components. 

FAQs

What is custom metal grinding?

It is a precision process that removes excess material or marks from metal surfaces to achieve specific dimensions, shapes, and finishes.

What is the best tool to grind steel?

The best options are cubic boron nitride (CBN) or aluminum oxide. However, choose based on the hardness and the desired finish of the steel workpiece.

What are the components of custom Metal grinding?

It includes the grinding machine, abrasive wheels, coolant systems, and dressing tools.

Can I customize the grinding wheel according to my needs?

Yes, you can customize the grinding wheel according to your needs by the customization of grinding tools and parameters.

Resource

Sheik Muhamad, S., Ghani, J. A., Juri, A., & Che Haron, C. H. (2019). Dry and cryogenic milling of AISI 4340 alloy steel. ResearchGate. https://www.researchgate.net/publication/334068071