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Bore cutting tool and method of making the same

A cutting tool and cutting tool technology, which is applied in the direction of manufacturing tools, thread cutting tools, tool holder accessories, etc., can solve the problem that the increase of film thickness is difficult to achieve, and achieve the effect of smooth pit surface and maintaining pit size

Active Publication Date: 2013-08-07
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an increase in film thickness is difficult to achieve

Method used

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  • Bore cutting tool and method of making the same
  • Bore cutting tool and method of making the same
  • Bore cutting tool and method of making the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0092] A tungsten carbide rod was machined to produce a twist drill blank with a diameter of 12 mm. The blank is provided with an ordered pattern (array) of dimples by laser etching in the surface of the blank corresponding to the bit body. figure 2 The area to which the pattern is applied is shown in . image 3 The pattern applied to the blank is shown in . The pattern comprises elongated dimples in the shape of "slots" arranged such that their long axis is parallel to the main longitudinal axis of the bit (perpendicular to the direction of bit rotation). Dimple density programmed to approximately 24 dimples / mm 2 .

[0093] SEM analysis showed that burrs or weld flashes existed around the periphery of the pit. Therefore, the blank is the surface cleaned using OD grinding to remove weld flash. exist Figure 4 The resulting dimples in the tool blank surface are shown in , Figure 4The figure shows that there is substantially no weld flash remaining.

[0094] The absenc...

example 2

[0111] Next, the same procedure as Example 1 was followed, with the difference that the laser dwell time was slightly longer during the laser structuring step.

[0112] After coating, the average pit width was measured to be 50 μm, the average pit length was measured to be 220 μm, and the average pit depth was measured to be 11 μm.

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Abstract

A bore cutting tool, particularly for cutting metal workpieces, includes a tool substrate and a tool coating on a surface of the tool substrate. The bore cutting tool comprises a plurality of pits in the surface of the tool substrate and wherein the tool coating extends over the pits such that the pit surface comprises the tool coating. In this way, the pit dimensions can be retained over prolonged tool life and the pits, with their coated surface, are particularly effective at retaining lubricant so that the thickness of a lubricant film can be increased as compared to a tool without the coated pits. In embodiments the pits are formed by laser etching and are present only on the cylindrical land. Average pit depth is suitably in the range 8 mum to 25 mum, average pit width and pit length is independently selected from 40 mum to 250 mum and average pit density is 20 to 30 pits / mm2.

Description

technical field [0001] The present invention relates to hole cutting tools and methods of manufacturing such hole cutting tools, in particular such hole cutting tools for metal workpieces, and in particular twist drills. Background technique [0002] When machining metals, one of the major influences in tool life is the lubricant (also known as coolant) applied. If the machining process is performed "dry" (without lubricant), tool life is significantly reduced when compared to machining processes with lubricant present. [0003] This is because the lubricant reduces the 'μ' value (coefficient of friction) between the contacting surfaces, i.e. between the tool and the workpiece. Reducing the value of μ leads to a reduction in the friction between the contactable surfaces, which in turn leads to a reduction in tool wear and heat generation. [0004] There are four basic forms of lubrication: hydrodynamic lubrication, in which two sliding surfaces are separated by a film of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23D77/00B23B51/02B23C5/10B23G5/06B23B27/14
CPCB23B2260/092B23B2228/10B23B51/06B23B51/02C23C30/005B23P15/32B23B2260/072Y10T29/49986Y10T408/78Y10T408/89B23B27/10B23B27/14B23C5/28
Inventor 杰米·格林大卫·高尔博尔内
Owner SANDVIK INTELLECTUAL PROPERTY AB