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Test lab for 3D print materials

New possibilities with plain bearings from a 3D printer

In our test laboratory, we tested the tribological behaviour of 3D-printed parts based on DIN ISO 7148-2. The series of tests covered linear, pivoting and rotary movements on different shaft materials.

The friction values of the iglidur® J260-PF filament were low in all tests, on the other hand, the ABS material failed the rotating test on the stainless steel shaft.

The printed plain bearings made from the iglidur® special filament had a similar wear resistance to the standard iglidur® injection-moulded parts on all test rigs.

Linear test (long stroke):

Test parameter:

Surface pressure: 0.11 MPa

Surface speed: 0.34 m/s

Stroke: 370 mm

Duration: 3 weeks

Shaft materials: alu hc

Linear tests (long stroke)  

Wear test linear (long stroke): v = 0.34 m/s; p = 0.11 MPa; stroke = 0.37 m; aluminium hc

Linear wear test

Y= Wear rate [μm/km]
 
A. ABS (printed)   B. iglidur® I180-PF (printed)   C. iglidur® J (moulded)

 
Test results:

The longitudinal stroke test shows that the resistance to wear of a printed iglidur® I180 plain bearing is higher than a printed plain bearing made of ABS (standard material) by a factor of 15.

Linear wear test  

Gear wheels from dynamic application test

Gear  

The 3D-printed gear wheel made of ABS (standard material) displays considerable wear when subjected to a torque of 1.2 Nm over an operating time of 75 h. In contrast to this, the printed iglidur® I180 (B) gear wheel shows hardly any wear at all although subjected to a higher load over a longer period of time.

Test: gear I6 dynamic  

1

POM: 321,000 cycles (high wear)

2

POM: 621,000 cycles (failed)

3

iglidur® I6: 1 million cycles (low wear)

Linear test (short stroke)

Test parameter:

Surface pressure: 1 MPa

Surface speed: 0,1 m/s

Stroke: 5mm

Duration: 1 week

Shaft materials: Cf53 and V2A

Linear tests (short stroke)  

Linear wear test: v= 0.1 m/s; p= 1 MPa; l= 5mm

Linear wear test

Y= Wear rate [μm/km]
 
A = ABS printed   B = iglidur® I180 printed   C = iglidur® I170 printed   D = iglidur® J260 printed   E = iglidur® J260 injection-moulded

 
Test results:

In the linear tests shown here, the wear rates of the printed iglidur® J260 bearings (D) and the injection-moulded iglidur® J260 bearings (E) are the same. This shows that, in terms of resistance to wear, printed iglidur® bearings are comparable to iglidur® bearings that are made in the traditional way.

Swivel test:

Test parameter:

Surface pressure: 1 MPa

Surface speed: 0,01 m/s

Pivot angle: 60°

Duration: 4 weeks

Shaft materials: Cf53 and V2A

Swivel test  

Wear test, swivelling: p= 1 MPa; v= 0.01 m/s; ß= 60°

Wear test, swivelling

Y = Wear rate [µm/km]
 
A = ABS printed   B = iglidur® I180 printed   C = iglidur® I170 printed   D = iglidur® J260 printed   E = iglidur® J260 injection-moulded

 
Test results:

The swivel test shows that the abrasion resistance of the iglidur® filament is up to 50 times higher than the standard 3D printing materials (e.g. ABS).

Wear test, swivelling: p= 20 MPa; v= 0,01 m/s; ß= 60°

Wear test, swivelling

Y = Wear rate [µm/km]
 
A = iglidur® I180 printed   B = iglidur® G injection-moulded   C = iglidur® J injection-moulded   D = iglidur® W300 injection-moulded   E = iglidur® J260 injection-moulded

 
Test results:

In this heavy-load test with a surface pressure of 20 MPa (respectively 800 kg), the resistance to wear of the printed bearings is comparable to that of the injection-moulded iglidur® bearings.

Friction test (rotating):

Test parameter:

Surface pressure: 1MPa

Surface speed: 0,3 m/s

Duration: 2h

Shaft materials: Cf53 and V2A

Friction test (rotating)  

Friction test, rotating: v= 0.3 m/s; p= 1 MPa; t = 2h

Coefficient of friction, rotating

Y = Coefficient of friction [MPa]
 
A = ABS printed   B = iglidur® I180 printed   C = iglidur® I170 printed   D = iglidur® J260 printed   E = iglidur® J260 injection-moulded

 

This tests shows the considerably lower friction coefficients of the iglidur® Tribo filaments compared to standard materials (ABS) for 3D printing.