Thielenhaus Microfinish | Experts For Microfinish / Superfinish Machines

Superfinishing for Shafts & Cylindrical Parts

With our portfolio of shaft superfinishing machines, manufacturers can practically finish all kinds of shafts and cylindrical components. These include balance shafts, drive shafts and pump shafts, as well as eccentric shafts such as crankshafts and camshafts. We also offer solutions for shafts requiring high precision ball screws, such as steering racks.
 
Depending on whether you require only a surface finish or an improvement of the component’s cylindricity or fine-waviness, we will offer a solution with either finishing stones, finishing tape or Continuous Abrasive Belt (CAB). For components with sensitive ends we also offer high-precision centerless finishing options with improvements for both the component’s surface and geometry.
 
Our shaft finishing machines have between one and four stations and up to 12 finishing units in accordance with your productivity and process requirements.

Shaft Finishing Solutions with Finishing Tape

Shaft Finishing Solutions with Stone Tools

Flat finishing solutions

Do you require extremely precise flat or even surfaces, with minimal surface roughness? A surface that is only a few microns convex or concave?  Or a component wall whose thickness meets the closest tolerances?

Achieve maximum accuracy and productivity with our market-leading superfinish machines for flat / even surfaces, or slightly concave or convex surfaces, for components ranging from 2 mm to 250 mm diameter. Our machines are available with an indexing table and up to 12 machining stations for high productivity, or without indexing table for lower volume production and prototype development.

Our MicroStar flat finishing solution is the favorite among manufacturers of fuel injection components and sensors, ensuring high quality, even surfaces and very, very close tolerances.

Bearing superfinish solutions

Do you manufacture ball or roller bearings?

Join leading manufacturers around the world and request a quote for a Thielenhaus BearingStar, the market-leading solution for bearing raceway finishing.

With our BearingStar platform we cover all bearing types and ring sizes with diameters ranging from 5 millimeters to 1.5 meters or more. Our machines ensure top-quality surface and profile for your raceways and are highly productive, with market-leading cycle times.

Do you need to superfinish bearing rollers? No problem: Thielenhaus offers highly effective through-feed finishing solutions.

Ball and spherical surface superfinishing solutions

Finishing, Grinding & Honing on one machine

Do you have a component that requires a combination of honing, brush-deburring, grinding and / or superfinishing?

If so, consider completing all of these steps on one machine and in one clamping. With our combined machining solutions, you are guaranteed an entry into the league of world-class manufacturers.

By completing these processes on one machine and in one clamping, it is oftentimes possible to reduce your investment and operation costs. Gone are the days where a seperate honing or deburring machine and appertaining peripheral equipment were necessary!

Simultaneously, combined machining can increase productivity and component quality. Combined finishing, grinding and honing of pinion gears, for instance, enables tolerances with regards to right-angularity of the bore to the face that are not achievable with conventional methods.

All components with high precision bores and flat or conical surfaces may benefit from this process.

Other Superfinishing Applications

Couldn’t find your application above?

That is because its practically impossible to list all of the superfinish applications we have worked on in the past. Razor blades, printing rollers, textile machine parts, perfume bottles, crankshafts for snow mobiles and air conditioners, sensors for oxygen tanks, gas stoves and excavators, coin stamps…the list goes on and on. Generally speaking, superfinish can be applied practically anwhere where there is a requirement for high precision functional surfaces.

Send us a drawing of your part along with your required results and we will get back to you as soon as possible.

What kind of results can I achieve via Superfinishing?

Improve Surface and Geometric parameters via Superfinish
 
 
The following is a list of some of the parameters which can be improved using the Superfinish process. If your parameter is not mentioned, please ask us!

Surface:

  • Average Roughness (Ra)
  • Ten point average roughness (Rz)
  • Bearing ratio (Tp)
  • Depth of surface valleys retaining lubricant (Rvk)
  • Etc.

Form:

  • Flatness
  • Straightness
  • Circularity
  • Cylindricity

Orientation:

  • Parallelism
  • Perpendicularity
  • Angularity

Profile:
  • Profile of a line
  • Profile of a surface
Runout:
  • Runout
  • Total runout

What is Superfinish Machining?

What is Superfinish?

 

Superfinish is a high precision metal-cutting process, often conducted after grinding or hard-turning, to further improve component surfaces and geometry. Superfinish utilizes abrasive films (generally up to 30 µm) or honing stone tools.

Key elements of the superfinish process are the overlaying movements of the finishing tool and the workpiece, involving a large contact area and low contact pressure.

The superfinishing process generates a very fine cross-hatch pattern.

In order to achieve a very flat surface with minimal surface roughness, tool and work piece are arranged in a displaced fashion. A cup wheel honing tool is mounted on a work spindle, and is rotated at several 1000 rpm. The component, clamped in an appropriate chuck, is rotated in the opposite direction (see picture).

For shafts or cylindrical surfaces, the component is clamped between centers and rotated, while the tool is oscillated at a right angle to the direction of rotation.

The combination of movements enables maximum consistency across the component surface. The speed at which the tools and component move, the finishing tool material, the contact pressure and many other factors influence the ultimate results.

 

What type of materials can be superfinished?

 

The superfinish process can be applied to a variety of materials, including cast iron, metal alloys, sintered metals, forged steel and different types of carbides. It can also be applied to ceramics, glass and some plastics.

 

Is there a difference between Superfinishing, Polishing and Lapping?

 

Yes, there is a significant difference between superfinish and the polishing and lapping operations:

  • Simultaneous improvement of surface roughness and geometry: unlike polishing and lapping, superfinish can simultaneously improve surface roughness and component geometry. For example, fine-waviness or cylindricity of a shaft, sphericity of a ball, flatness of a component face, or parallelism of two faces. It can also be used to create a convex or concave surface.
  • Lapping requires a paste, superfinish doesn’t. During superfinish operations there is no risk of paste particles penetrating the component surface.
  • Automation: superfinish machines are easier to integrate in production lines and can be fitted with measurement controls, leading to better cycle times.

What is the history of Superfinish?

The superfinish process was first publicized by the U.S. automotive manufacturer Chrysler in the 1930s. At the time, the company discovered that superfinishing could be used to increase the durability of the wheel bearings installed in its vehicles. It subsequently published a series of advertisements about the new technology, making it more well-known. Thielenhaus became one of the first adopters of the new technology, building its first superfinish machine in the 1940s.

About Us

For more than 100 years Thielenhaus has been developing new and innovative solutions in machining. Our broad portfolio of machine-tools for high-precision surface finishing is designed to meet your needs regardless of surface type, component material or lot size. With production facilities on three continents and deliveries to 15 industries in more than 35 countries, we pride ourselves on being a global provider with an intimate understanding of our customer’s needs.

The division Thielenhaus Microfinish of Thielenhaus Technologies GmbH was founded in 1909 as the Maschinenfabrik Ernst Thielenhaus. Over the years it has become one of the most important global players within the field of fine machining. The demands on technical components regarding high impact resistance and increasing life can be met by applying the Microfinish process. By a consistent development of machining and process control technologies we were able to solve so called "no go" problems (i.e. where the usual answer would have been "no way"). We see ourselves as your partner in the field of fine machining offering you both custom made and standard solutions.

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