Wooden material grinding force determining method

A measurement method and technology of grinding force, which is applied in the field of wood processing, can solve the problems that the grinding force is not accurate enough, does not have real-time performance, and cannot reflect the changing trend of grinding force, etc., and achieves simple and strong accuracy. Effect

Inactive Publication Date: 2014-04-23
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0004] However, due to the different surface properties of different wood products, there is no accurate general calculation method for grinding force in the grinding process of wood materials.
However, the indirect measurement of grinding force through power and other methods is not accurate enough, and it is not real-time, that is, it cannot reflect the changing trend of grinding force during the grinding process.
[0005] So far there is no measurement method for the measurement of grinding forces during grinding of wood-based materials

Method used

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  • Wooden material grinding force determining method
  • Wooden material grinding force determining method
  • Wooden material grinding force determining method

Examples

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example 1

[0027] The invention provides a method for measuring the grinding force of wood materials. The testing machine used in the method is a single sand frame contact roller sander, the contact roller is a spiral groove rubber roller, and the Shore hardness is 25. The grinding thickness accuracy of the testing machine is 0.05mm. Measuring instruments include: KISTLER-3257A sensor, KISTLER5806 charge amplifier, NEC OmniaceⅡRA2300 signal analyzer.

[0028] The material used is poplar wood with a density of 0.44g / cm 3 , the grinding direction is perpendicular to the grain direction. The length of the test piece is 150mm and the width is 100mm. The model of the abrasive belt is CXB-508, and the abrasive grains are electrostatically planted.

[0029] Grinding conditions: the mesh number of the abrasive belt is 60 mesh; the belt speed is 5.35m / s; the feed speed is 5.14m / s; the grinding thickness is 0.2mm.

[0030] The determination method includes the following steps: firstly, the rel...

example 2

[0047] The equipment, instrument, calibration method and calibration results used in the determination process are all the same as in Example 1.

[0048] The material used is medium density fiberboard with a density of 0.741g / cm 3 . The length of the test piece is 150mm and the width is 100mm. The model of the abrasive belt is CXB-508, and the abrasive grains are electrostatically planted.

[0049]Grinding conditions: the mesh number of the abrasive belt is 80 mesh; the belt speed is 5.35m / s; the feed speed is 3.71m / s; the grinding thickness is 0.5mm.

[0050] Figure 9 The curve diagram of the grinding force and electricity signal in the grinding process, Figure 10 In order to remove clutter and remove the abrasive belt without touching the workpiece and after the abrasive belt and the workpiece are separated, the post-wave grinding force and electrical signal curve. Because the calibration direction is opposite to the grinding force direction, the electrical signal val...

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Abstract

The invention provides a wooden material grinding force determining method. The method comprises the following steps of calibrating the relation between a force in the horizontal direction and an electric signal value by utilizing a deweighting method, carrying out linear-regression analysis on the obtained electric signal value and the force in the horizontal direction to obtain a proportional relation of the grinding force and the electric signal value; horizontally placing a wooden material test piece onto a worktable through a tool, arranging a force sensor between the worktable and the tool, connecting the force sensor with a charge amplifier, connecting the charge amplifier with a signal analyzer, and connecting the signal analyzer with a computer; grinding a wooden product, generating a charge value through the variation of the horizontal force on the test piece detected by the force sensor, utilizing the charge amplifier and amplifying and converting the charge value to a voltage signal to be collected by the signal analyzer, fitting the electric signal collected by the signal analyzer to obtain an electric signal value, and converting the electric signal value according to the proportional relation to obtain a maximal value and an average value of the grinding force. The determination method is strong in real-time property, strong in accuracy, simple, high efficient and reliable.

Description

technical field [0001] The invention relates to a force measurement method, in particular to a wood material grinding force measurement method, which belongs to the field of wood processing. Background technique [0002] Broadband sanding machine is mainly used in the thickness-setting processing and plane polishing of solid wood boards, particle boards, medium-density fiberboards, plywood and other boards to obtain good surface quality and decorative effects. It is widely used in the production of furniture, floors, wooden doors, and wood-based panels. . [0003] Grinding force is the force generated by the cutting, sliding and friction of many abrasive grains and the surface of the workpiece during the grinding process, which directly affects the energy consumption, heat generation, vibration and surface quality of the workpiece during the grinding process. Taking the grinding force as a reference, when designing a sander, you can better choose the power configuration, sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
Inventor 罗斌李黎刘红光王明枝
Owner BEIJING FORESTRY UNIVERSITY
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