FINE TOOLS / BEARINGIZING TOOL

 

 

∅10.7 Bearingizing Tool

Bearingizing Tool :


               The Bearingizing Tool combines roller burnishing with peening action. As the tool is rotated at a high speed the rolls spin, rise, and fall over a cammed arbor, delivering up to 200,000 rapid fire blows per minute to the work surface. The peaks and valleys of the machined surface are compacted into a smooth, hardened, and ultrafine surface finish.

 

Bearingizing Tools Specification : 4.8mm To 31.8mm

 

Nominal Tool Size Build - up Range Shank Dia Over all Length (a) No of Rollers
4.8 4.8 20
30
40
139.7 6
5.5 5.6 139.7 6
6 5.9 152.4 6
6.4 6.3 152.4 6
7 7 152.4 6
7.1 7.1 152.4 6
7.9 7.9 152.4 6
8 8 152.4 6
8.7 8.8 177.8 6
9 9 177.8 6
9.5 9.4 177.8 6
10 10 177.8 6
10.3 10.3 203.2 6
11 11 203.2 6
11.2 11.1 203.2 6
11.9 11.9 203.2 8
12 12 203.2 8
12.7 12.7 203.2 8
13 13 203.2 8
13.4 13.5 203.2 8
14 14 203.2 8
14.29 14.4 203.2 8
15 15 203.2 8
15.1 15.1 203.2 8
15.9 15.9 203.2 8
16 16 203.2 8
16.8 16.7 203.2 8
17 17 203.2 8
17.5 17.5 203.2 8
18 18 203.2 10
18.3 18.3 203.2 10
19 19 203.2 10
19.1 19.1 203.2 10
19.8 19.9 203.2 10
20 20 203.2 10
20.6 20.7 203.2 10
21 21 203.2 10
21.4 21.5 228.6 10
22 22 228.6 10
22.2 22.3 228.6 10
23 23 254 10
23.1 23.1 254 10
23.8 23.9 254 10
24 24 254 10
24.6 24.6 254 12
25 25 254 12
25.4 25.5 254 12
26.9 27 254 12
28.6 28.7 254 12
30.1 30.2 254 14
31.8 31.8 279.4 14

 

Machines :


Any machine capable of rotating the tool, CNC turning centre, VMC.

 

Material :


Any material less than 38 hrc tool to be used ferrous and Non ferrous. Steel, stainless, alloy, cast iron, aluminum, copper and brass.

 

Procedure :


            Proper part preparation is essential in order to obtain precise results. We recommend the surface preparation and amount of stock to leave for Bearingizing, but some trials may be required to determine these factors for optimum results. Since the change in dimension is partly governed by the character of the prepared surface, usually coarser preparation will permit a greater change in dimension than is possible with finer preparation.The consistent pattern obtained from boring will produce the best finish. The other major factor in dimensional change is the ability of the material to grain - flow without flaking. The total change may vary from 0.0025mm on harder materials to as much as 0.0762mm on sintered selflubricating bushings. Less than 0.0254mm stock for Bearingizing generally provides a good starting point for trials.

 

Total Diameter Changes :


             Bearingizing rolls are manufactured in increments of 0.0025mm. Bearingizing Tools are adjustable by roll change only. One set of rolls can be removed and a new set of a different size installed, thus effectively changing the size of the tool - or compensating for tool wear. The working diameter of any tool can be changed over an approximate 0.1016mm range by installing different sets of rolls. The rolls are diametrically opposed and available in 0.0025mm increments, therefore the effective tool diameter can be changed in 0.0051mm increments.

 

Lubrication :


             For most metals use any standard grade of lightweight, low viscosity lubricating oil,or any mineral, sulphur or soluble oil that is compatible with the alloy or metal to be burnished and is recommended for fine surface finishing. For aluminum or magnesium alloys, use a highly refined oil - based coolant with low viscosity. For cast iron a mineral seal or water soluble solution is ideal - flooding the part is recommended.

 

Cleaning :


             The Bearingizing tool should be cleaned periodically with a lightbodied oil of about 100 Saybolt universal scale, similar to a light spindle oil. A few drops applied with squirt can or brush to the rolls and cage (with cage stopped) will wash metal dust particles out when tool is operated, keeping the cam surfaces and roll pockets clean.

 

Speed and Feed Recommendation :

 

Hole Diameter (mm) RPM Hole Diameter (mm) RPM Hole Diameter (mm) RPM Hole Diameter (mm) RPM
4.8 8200 19.0 2000 44.2 875 69.8 555
6.5 6100 22.2 1800 47.6 815 73.0 530
7.9 4900 25.4 1500 50.8 765 76.2 510
9.5 4100 28.6 1350 53.9 720 88.9 435
11.1 3500 31.7 1200 57.1 680 101.6 380
12.7 3100 34.9 1100 60.3 645 114.3 340
14.3 2700 38.1 1000 63.5 610 127.0 305
15.9 2400 41.3 950 66.7 580 139.7 280

 

Recommended Application :


1. Used in thin wall sections it improves roundness where as normal burnishing tool cannot to be used.
2. Used in irregular wall thickness to improve size control and roundness.
3. Used where porosity is an issue.
4. Used in closed tolerance example 0.002mm size repeatability maintained.
5. It improves the surface hardness with 10% to 30% but with less surface penetration, whereas burnishing tool achieves surface harness of 5% to 10%.
6. That means wear and tear will be more in the components

 

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