Kitagawa India



LANG Stamping Technology is also called as pre-stamping, where the work piece is stamped outside of the machine tool with up to 20 tons of pressure, before being clamped in the LANG Makro.Grip 5 axis vice.

For clamping scenarios that require high holding power, but where the danger of work piece deformation exists can be avoided with the pre-stamping process. For 5-sided machining where optimal accessibility must be achieved, LANG stamping technology used in conjunction with the LANG Makro.Grip 5 axis vice is the ultimate solution.

External Pre-Stamping

The stamping operation is performed offline. No machine tool is required for the work piece preparation.

Form-Closure Technology

Form-Closure Clamping offers high holding forces with the low clamping pressure

Material Savings

Minimum 3mm clamping edge requirements equals less material removal during subsequent operations.

External Pre-Stamping

Pre-Stamping Technology allows even high tensile strength materials to be held reliably and without wear in Makro.Grip 5 axis vice’s form-closure profile teeth. Work piece blanks are prepared with a contour at an external stamping station under high pressure and ready for the work piece clamping device. The application of force to the work piece happens before the actual clamping process in the vice, limiting the function of the 5-Axis vice to simply holding the work piece.

The other manufacturer’s stamping technique were able to build up a maximum approximate pressure of 4-6 tons. Penetrating the work piece becomes a challenge especially with the harder materials. To ensure the work piece is penetrated correctly, the holding teeth of the serrated jaws must be sharp with the entails an increased susceptibility to wear, and thus effects the clamping quality. For soft, distortion prone materials, holding teeth also tend to lose holding power as they can work themselves free of the work piece during machining forces.

On the other hand, the stamping technology builds up to 20 tons of pressure during external pre-stamping and ensures problem free preparation, even with hard materials of up to 1.500N/mm2 tensile strength. After pre-stamping, only the low clamping pressure is required to hold the work piece in the 5-Axis Vice allowing its design to be very compact and eliminate wear on the clamping teeth. The contour shape (truncated pyramids) and low clamping pressure don’t allow the clamping teeth to seat deeper into the work piece, always providing a defined stop.

The use of LANG stamping technology pays off where conventional machine vices reach their limits in terms of material hardness. Despite the low clamping pressure and compact design, the resulting holding forces on a work piece in the Makro. Grip 5-Axis Vice are higher and more resistant even with material up to 45 HRC.

The Benefits of Form-Closure technology

Resource Protection

             Due to the minimal 3 mm clamping edge requirements the materials are saved enormously.

Reduction of costs per piece

            The cutting rates of the form closure are high which leads to shortened machining times and reduce the costs.

High Milling Quality

             The vibrations are reduced on the work piece which ensure the high accuracy and increased in the milling quality.

Process of the Stamping Technology

  1. Sawing

              The workpiece is stamped directly on the saw cut or cinder layer of the blank and no additional preparatory work is required.



  1. Stamping

             Stamping is realized within 5 seconds. The workpiece is stamped up to 20 tons of pressure using external stamping system and it conducts on the rough layer of the workpiece.



  1. Clamping

             The stamped workpiece is clamped in the jaws with the clamping depth of 3 mm and it is ready for operation.




A reliable wear-free clamping process for high-tensile materials 

             The stamping unit adds the form-closure contour to the workpiece with up to 20 tons of pressure. This allows you to clamp even high-tensile materials up to 1.500N/mmtensile strength reliably and virtually wear-free. Different material hardness requires different stamping jaws to extend longevity and guarantee safe clamping. Our standard jaws allow you to stamp workpiece up to 35HRC, whereas high-tensile materials up to 45HRC requires high end stamping jaws.




Setting the stamping depth and pressure correctly

             The large number of alloys makes it difficult to make an exact statement about the stamping pressure to be set. The two main parameters are workpiece width and material. In general, starting with a low stamping pressure and slowly increasing it until the desired stamping depth in the workpiece is achieved. 

Stamping tooth imprint with correct stamping 

             The visual inspection gives the user reliable feedback as to whether the inlet pressure has been selected correctly or whether readjustment is required. Depending on the material hardness, there are two different stamping tooth imprints. Soft material needs a bit more holding surface due to the higher toughness. Therefore, it must be stamped in such a way that control marks between the stamping tooth imprints are visible. With harder materials, it is not necessary to stamp as deeply because of the higher resistance.


Materials <35 HRC with standard stamping jaws 

The stamping contour with alternating stamping tooth imprints and control marks is clearly visible. The depth of the control marks should be about 0.1mm. The depth of the imprints should be about 0.25mm. 



Materials >35 HRC with High-End stamping jaws

For material with a hardness between 35 and 45 HRC, the control marks should not be visible. The depth of the imprints is about 0.15 mm.