Model 146

Description

The special feature of Model 146-60 is the increased drawing speed of the drawing punch which, in addition to the normal drawing speed range of 0 – 1200 mm/min can be adjusted, in an infinitely variable manner and independent of load, up to 3000 mm/min. This is achieved by using a separate oil circuit, fed by a pump with high volumetric displacement. Contrary to the high speed attachment based on a nitrogen accumulator, here a constant drawing speed behaviour is guaranteed over the total displacement of 150 mm. As to the technical design and the options available, including PC control and proportional valve technique, this machines are similar to Models 145.

Application

This Sheet Metal Testing Machine is not only ideal for the effortless, quick and accurate performance of all significant known deep drawing tests for ferrous and non-ferrous metals, it is also designed for a large number of additional technological investigations like the ERICHSEN Cupping Test and the ERICHSEN Deep Drawing Cup Test. Relevant attributes are:

• Square Cup Test (40 x 40 mm or 70 x 70 mm)
• Bore Expanding Test (ISO 16630)
• Determination of the Forming Limit Curves (FLC)
• LDH Test
• Deep Drawing Tests with Blankholder Quick Release (for Earing Test)
• Deep Drawing Tests with Preselected Punch Stroke
• Deep Drawing Test at High Temperatures up to 550 °C / 700 °C
• Bulge Test in accordance with ISO 16808
• ERICHSEN Cupping Test for Lacquer and Paint in accordance with DIN ISO 1520
• Stamping Lacquer Test and Deep Drawing Cup Test on Coil Coatings
• Special Requirements on request
  
  

Design

The Testing Machine is driven electro-hydraulically. The test sequence is controlled automatically or manually as appropriate. A programme logic controller is used for the functions of the machine (optional computer controls). The drawing force and blankholder force as well as the drawing punch stroke are digitally displayed. The triple-acting hydraulic system in conjunction with the general design results in the following cost saving simplifications:

• Blanking press in the test head
• Hydraulic cup ejector
• Fully-automatic test sequence
  
  

Further technical advantages

• Cylinder head with bayonet lock
  • permitting direct access to drawing dies, blanking rings, blank holders etc. and quick and convenient changing of the drawing and blanking tools
• Infinitely variable drawing speed
  • once set it remains constant throughout the drawing movement, independent of any change of load
• Cardanic drawing die retention
  • ensures the consistent, parallel clamping of the specimen, independent of variations in thickness
    
    

Sheetholder Quick Release and Drawing Punch Stop (BSA-ZS)

During the drawing sequence the constant sheet holder force acts on a continuously reducing area of sheet metal under the sheet holder. The result is increasing specific pressure as the remaining flange reduces with the result that in the final phase of the drawing process and especially in cases with severe ear forming tendency, a squashing of the ear-ends will occur. For this reason, provision is made to release the sheet holder pressure completely at a preselected depth where there is no more tendency for folds to form.

The machine is provided with an digital display of the drawing punch stroke and a selector switch for either "BSA" or "ZS". When the depth of draw selected on the digital display unit is reached the drawing punch stops completely – in case of the "ZS" mode, or the sheet holder force is released – in the case of the "BSA" mode.

Hydraulically lifted test head

Hydraulic test head lifting function ensures a high rate of working safety and facilitates convenient testing due to the fact that the test head is hydraulically opened and closed.

Scope of delivery

• Universal Sheet Metal Testing Machine, Model 146-60
• Manufacturer's Test Certificate M