Profile

The ACunity GmbH was founded as a spin-off company out of the Fraunhofer-Institute for Laser Technology (ILT) in Aachen, Germany. The head office is located in the Photonics Cluster of the ILT, and it benefits from the local, close network of recognized experts in laser technology as well as the state-of-the art infrastructure this location offers.​

The ACunity GmbH was jointly created by experts from Germany and China to conduct R&D, consulting and training services for laser additive manufacturing, laser welding, related advanced technology and equipment for the Chinese market.

The company works to support customers in the adoption of the most advanced laser technology for their manufacturing processes.

Innovative

Innovative

Efficient

Efficient

Professional

Professional

Expertise

R&D Management

In close cooperation with Fraunhofer ILT, ACAM (Aachen Center for Additive Manufacturing), HIT (Harbin Institute of Technology), and NUAA (Nanjing University of Aeronautics and Astronautics), we assist our clients in formulating innovative R&D strategies in advanced laser-based manufacturing. We help our clients to

  • analyze and understand the challenges
  • align R&D processes and build the roadmaps
  • optimize research resources, including project management team, infrastructure and integrate learning loops for continuous improvement.

Application Consulting:

Before you acquire your own laser system and components, our team will help you set up the most efficient process based on your production design. This means we will ​

  • help you find the approriate laser engineering for a broad range of existing and potential applications
  • develop processes for your individual applications
  • advise you about system technology suitable for laser processing.

Systems Integration Services

Since the manufacturing industry has such diverse requirements, the system technology of a laser metal deposition (LMD) system must normally be customized so that performance can be improved and costs optimized. We work closely with Fraunhofer ILT and industry partners and aim to provide our clients with optimized system technology, both of which will facilitate your work flow and achieve a better input-output ratio.

Training

We regularly provide open training modules on laser additive manufacturing. We provide on-site training with individual coaching and comprehensively train your operators and maintenance staff in process and system technology thoroughly. These training modules are available in Germany and China, in German, Chinese and English. Besides the training, you can learn from the best – We regularly visit high-tech companies in Germany. In these sessions you can learn about

  • Theoretical basis of Laser Additive Manufacturing
  • Methodology of process development of LMD and
  • Construction and function of the LMD system.

Contract Manufacturing

With our state-of-the-art equipment, our specialized engineers accompany our clients from the feasibility studies for prototypes with diverse metallic materials all the way to mass production that needs neither a large amount of equipment nor personnel. We can provide the following manufacturing processes for you:

  • Laser hardening
  • Laser metal deposition
  • Laser welding

Management Team

Chen Hong
Managing Director
chen.hong@acunity.de

Prof. Dr. Liqun Li
Managing Director
liqun.li@acunity.de

Dr. Wang Tao
CTO
wang.tao@acunity.de

Prof. Dr. Reinhart Poprawe
Fraunhofer Liaison Partner

Dr. Andres Gasser
Senior Counselor

Dr. Khudaverdi Karimov
Senior Counselor

Prof. Dr. Dongdong Gu
NUAA Research Partner

Frank Rijsdijk
System Technology

Partners

Fraunhofer ILT
Fraunhofer IPT
ACAM Aachen
Ixun Lasertechnik GmbH
Laserfact GmbH
Hornet Laser Cladding
NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS
Harald Dickler - Sonderoptiken für die Lasertechnik

Process



Laser Additive Manufacturing (LAM)

Laser additive manufacturing (LAM), a rapidly developing and advanced processing technology, has demonstrated it is suitable for a board range of application, ones used in various industries including aerospace, machinery, electronics, automotive, oil & gas industry and medicine. Unlike the conventional material ablation methods, LAM can create of dense structures directly from raw materials through layer-by-layer construction - a distinct advantage. Besides being able to manufacture a component to near-net-shape capability, the LAM process has the unique ability to fuse metal powders.

© Fraunhofer ILT


Laser Beam Welding (LBW)

Laser beam welding (LBW) is widely used in modern industries because it has lower weld heat inputs and lower distortion, greater welding speed and higher processing efficiencies. Today, innovations in laser beam welding using high brightness lasers make it possible to join metals in a variety of ways.

LBW Technologies

  • Laser deep penetration welding
  • Laser-arc hybrid welding
  • Laser stitch welding
  • Laser brazing and laser welding-brazing
  • Dual beam laser welding
  • Oscillation beam welding

Applications

  • Tailored blank and galvanized sheet welding for automobiles
  • Thicker plate welding for heavy structures
  • Dissimilar materials welding for light-weight components
  • Materials: carbon steel, stainless steel, galvanized steel, aluminum, titanium, nickel, copper, MMC.
© ACunity GmbH



Laser Metal Deposition (LMD)

Laser metal deposition (LMD) is an additive manufacturing process that uses the technology of laser cladding. Here, a component is built by cladding. The result is a near-net-shape component with almost 100 % density and a property profile that meets the specifications of wrought or cast material, or even exceeds them. The size of the components is only limited by the used handling system used. LMD makes it possibile to produce new material concepts, e.g. grading of bulk properties or build hybrid components consisting of a variety of different metals without joining technology. Typical applications are the production of functional prototypes and parts in small batches. In addition, LMD can also be used to repair manufactured components.​

Advantages of LMD

  • Low heat input into the component
  • Near-net-shape manufacturing of high-quality components with design flexibility
  • Utilization of diverse materials even graded and hybrid materials
  • No restriction of the build-up size

Applications:

  • Near-net shape manufacturing of high-quality components with design flexibility
  • Repairing of casting and molds
  • Repairing of mining equipment
  • Extension of the lifetime of high-quality components
  • Improvement of corrosion and wear resistance
© Fraunhofer ILT

Equipment & Solutions



Powder Nozzles

The higher the quality of a powder nozzle is, the better the LMD process can be controlled. Thanks to their unique construction, the powder nozzles developed by Fraunhofer ILT possesses many advantages: highly accurate deposition rate, high powder efficiency, and suitability for different powder materials. The size of the powder nozzle can be adapted so that it can process areas difficult to access. Its integrated water cooling guarantees continuous operation.



Powder Switcher

In praxis we often have to stop the LMD process during the repair work so that the component can be cooled down or the optics need to be repositioned. To ensure that a LMD process runs several hours flawlessly, a continuous powder supply needs to be guaranteed. The HD powder switch is the best solution to ensure powder is not wasted and repair process runs over a long period of time. HD, a company based at Fraunhofer ILT, has developed a high-speed powder switch that allows the powder gas stream to be switched on and off and can toggle between two powder gas flows.




LMD Software

LMDCAM2 is a CAM software tool developed specifically for laser metal deposition (LMD) applications: repairing, cladding and additive manufacturing.

The Fraunhofer Institute for Laser Technology (ILT) has designed a process chain for the laser material deposition (LMD), whose CAM module - LMDCAM - is based on a polygonal modelling approach that can represent geometrical forms. The target geometry of heavy-duty parts is derived from a best fit with the CAD model from the design stage. LMDCAM supports the generation of all sorts of path patterns within one layer, which for example may be derived from a distortion reduction analysis.

Functions:

  • Offline CAM programming optimized for LMD applications
  • Powerful tools for path manipulation
  • Fast operation on large triangle data sets
  • Adaptable to individual requirements through NC generator backend

Main Features:

  • Tool path planning for the LMD process
  • Optimized for working with scanned 3D data or triangulated CAD models
  • Generation of NC code or robot code by a script-driven post processor (process and machine specific adaption)
  • User friendly graphical user interface


Hybrid Laser Processing Head

Our innovative combi-head unites cutting, component measurement, and welding in a single process chain, with one machine and one processing tool. Invented at Fraunhofer ILT, this technology is used for cutting strip ends to length and welding them in steel industry coating and inspection lines as well as in the manufacture of high-precision metal assemblies. In 2016 the engineer team integrated the cladding function to achieve the first laser processing head world-wide that combined laser welding, cutting and cladding functions. This invention will offer the user unimagined productivity and flexibility and itself constitutes a hybrid working process. ​




Inside Cladding Optics

An growing field of application is the coating of heavily loaded internal surfaces of e.g. bearings, castings, cylinder bores, drilling tools, and extruder barrels. Thanks to the aid of inside cladding optics, these components-perviously inaccessible for standard heads-can profit from a reliable repair process based on LMD. The laser beam optics, powder, cooling-water and shielding gas are all integrated in a slender and compact tube. The optics are capable of handling a laser power of up to 4kW and entering hollow components of more than 50 mm in diameter and up to 2000 mm immersion depth.

Optics Features

  • Standard mode
    • Insertion depth: 400~2000 mm (one side)
    • Diameter of inner contours: min.50mm
    • Processes: laser cladding, laser hardening
    • Equipped with pyrometer, camera, process control
  • Optics with coaxial or multiple stream powder nozzle
  • Rotatable powder feeder
  • Exchangeable processing head
© IXUN GmbH


LMD System

LMD systems are complex. To fulfill the diverse applications and functions, the system should be built based on a deep knowledge of process and system technology as well as in consideration of the project budget. We do not offer cookie-cutter solutions. For each project, we analyze the our customer's demands. The key components such as powder nozzle, optics, laser, powder feeder, handling system and software can be integrated completely as one system or only partly based on an existing system from the customer.

© HORNET LASER CLADDING B.V.