Chemical mechanical machining and surface finishing

A technology of surface finishing and chemical substances, applied in the direction of mechanical equipment, metal processing equipment, grinding machine tools, etc., can solve problems such as lubricant residue and wear, and achieve the effect of improving machining accuracy and reducing volume

Inactive Publication Date: 2004-04-21
REM TECHNOLOGY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another disadvantage of this method is that abrasive particles are injected into the surface, thereby causing stressors, lubricant residue and / or wear

Method used

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  • Chemical mechanical machining and surface finishing
  • Chemical mechanical machining and surface finishing
  • Chemical mechanical machining and surface finishing

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] Example 1 - In-situ surface finishing

[0030] Two similar SAE 4140 carbon steels with nominal dimensions of 3.5 x 1 x 1 / 2 inches and a hardness of 43-45 HRC were used as test specimens. In the past, 3 x 1 / 2 inches of each specimen was mechanically polished in the machine direction with 180 grit wet / dry emery paper. Initial R of Sample 1 a and R max 10.0 microinches and 98.4 microinches, respectively. Initial R of Sample 2 a and R max 17.6 microinches and 167 microinches, respectively.

[0031] Specimen 2 was placed in a solution of 60 g / L oxalic acid and 20 g / L sodium m-nitrobenzenesulfonate with its traditionally mechanically polished side facing up. Then, the conventionally mechanically polished surface of Sample 1 was placed in vertical contact with the conventionally mechanically polished surface of Sample 2 . Specimen 2 was held in a fixed position while specimen 1 was moved back and forth by hand in a circular motion to simulate sliding of critical contact...

example 3

[0041] Example 3 - Chemical Mechanical Processing with Slightly Abrasive Tools

[0042] Slightly abrasive (600 grit) wet / dry emery paper and FERROMIL maintained at 6.25% by volume as the active chemical used to create the conversion coating  , a Falex Corporation FLC lubricating test ring with steel grade SAE52100 and hardness HRC57-63 (part #001-502-001P) was machined in a conventional manner.

[0043] A hard plastic mold (Facsimile  ) with a 600 grit wet / dry emery paper pressed against it, the Falex Corporation FLC Lubricity Tester rotates the ring at a set speed. The 0-150 foot-pound Sears Craftsman torque handles on which gravity is applied by Falex are the only loads used in the chemical-mechanical method. The ring is partially submerged in 6.5 mL / min of FERROMIL flowing through the container at room temperature  FML-575.

[0044] See Figure 1 for a diagram of the experimental setup.

[0045] The test rings were cleaned, dried and weighed on an analytical balance ...

example 5

[0056] Example 5 - Chemical mechanical processing with and without abrasive plastic tools

[0057] Use Ferromil  VII Aero-700 to finish a FalexCorporation FLC lubrication test ring with steel grade SAE4620.

[0058] In a fixed FERROMIL  A Falex Corporation FLC Lubricity Tester rotates the ring at a set speed while Media #NA (plain plastic (polyester resin) without any abrasive particles) contacts the outer ring. The plastic media is shaped as a ring to provide proper surface contact. The ring is partially submerged in 12.5% ​​by volume of FERROM flowing through the container at 6.5 ml / min  VIIAero-700. see figure 2 Diagram of the experimental setup.

[0059] The test rings were cleaned, dried and weighed on an analytical balance before and after processing to determine the amount of metal removed.

[0060] The experimental ring weighed 22.1059 grams before processing. Weighed 22.0808 grams after 3 hours of processing at 460 RPM. The total loss was 0.0251 grams or 0...

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Abstract

The invention described herein discloses a chemical mechanical machining and surface finishing process. A conversion coating is formed on the surface of a workpiece and is removed via relative motion with a tool, thereby exposing the workpiece to further reaction with the active chemistry. Low mechanical forces are used such that the plastic deformation, shear strength, tensile strength and / or thermal degradation temperature of the workpiece are not exceeded. Since the chemical mechanical machining and surface finishing process requires little force and / or speed of contact to remove the conversion coating, the equipment's mass, complexity and cost can be significantly reduced, while simultaneously increasing machining precision and accuracy. The present invention lends itself to a very controlled rate of metal removal, and can simply surface finish the workpiece, or if desired, can surface finish the workpiece simultaneously with the shaping and / or sizing process.

Description

Background technique [0001] Traditional machining is a highly aggressive process. Even at the microscopic scale, such processing almost always results in metallurgical damage, no matter how much care is taken, due to the highly concentrated force applied and the consequent localized high temperature peaks. Such damage may include microcracks, introduction of stress concentrators, oxidation, phase transformation and reduction of beneficial compressive residual stresses and reduction of microhardness. Grinding operations, for example, can generate enough heat to temper the surface of the hardened workpiece, often referred to as abrasive burn, thereby reducing the wear fatigue and contact fatigue properties of the workpiece. In addition, traditional machining has always produced burrs and machining lines. These residual burrs and machining lines must be removed from critical surfaces to reduce wear, friction, operating temperature, scratches, contact fatigue failures (pitting) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23C3/00B23F19/00B24B1/00B24B5/42B24B19/06B24B33/00B24B37/00B24B37/04C23C22/07C23C22/24C23C22/46C23C22/47C23C22/73C23F3/00
CPCC23F3/00B24B33/00B24B5/42C23C22/73B24B37/042B24B37/00B24B37/11
Inventor M·D·米肖德G·斯罗卡L·W·温克尔曼
Owner REM TECHNOLOGY INC
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