Machine description
Rolling is the term used to designate forming (generally cold) of a round part (cylindrical or tapered) by tools, rotating or otherwise, in various numbers and arrangements around the work-piece. Forming can also be carried out at medium temperature on certain materials (in the aeronautical industry in particular). Rolling is used increasingly because it brings many advantages compared with machining:
Improved surface condition (which can be further improved by burnishing).
Increased mechanical strength by work hardening (see below), by avoiding fracture starts generally due to tool marks or scratches and by fibring obtained on rolling.
Economy of matter since the blank diameter (the one whose volume corresponds to that of the finished part) is less than that of the finished part (outer diameter).
Shorter cycle time on machining in many applications (above all on spline rolling).
Better quality is achieved than with conventional machining: Rolling is therefore occasionally used to obtain a better quality than machining and to avoid milling.
TOOLS
There are generally two tools, but one, three or four tools are also regularly used (even more in certain cases). The reason for increasing the number of tools is to reduce the force applied locally to the workpiece in order to avoid deforming it too much (for instance, a hollow part). The tools are generally arranged symmetrically around the workpiece (except in the case of a single tool) to avoid stress on holding the workpiece, and maintains the workpiece in the centre of the tools (no radial movement of the workpiece during forming, an important factor when working long bars or heavy items, for instance).
There are three possible tool shapes:
Convex: The tools have a circular form with an outer active surface.
Straight: These are usually called rack or die stock.
Concave: The tools have a circular shape but with an inner active surface.
Specification
| SP200 / SP320 Spline Rolling Machine |
| Max. rolling pressure |
KN |
200 |
320 |
| Rolling spline range |
Max. diameter |
mm |
70 |
70 |
| Max. module |
mm |
0.75 |
1.25 |
| Rolling die range |
Max. outer diameter |
mm |
178 |
200 |
| Aperture |
mm |
54 |
75 |
| Max. width |
mm |
105 |
120 |
| Max. center distance btw. main axis |
mm |
240 |
270 |
| Main axis rotation |
r.p.m. |
28.35.45.56 |
19.24.31.40 |
| Main axis inclination |
|
|
|
| Feed travel |
mm |
2*7 |
2*7 |
| Center height |
mm |
900 |
900 |
| Gross power |
KW |
10.2 |
12.2 |
| Dimensions(L*W*H) |
mm |
1500*1700*1600 |
2000*1900*1650 |
| Packing dimensions(L*W*H) |
mm |
2000*2000*1900 |
2250*2000*1900 |
| Weight |
Kg |
3000 |
3500 |
Package
Exhibitions in 2019
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