CN105922084B - A kind of fine grinding technology to coating for metal surfaces - Google Patents

Abstract

This case discloses a kind of fine grinding technology to coating for metal surfaces, including：Workpiece to be ground is washed；Workpiece is placed at 60 80 DEG C and cured 0.5 1 hours；Workpiece is placed in ultraviolet environments 0.5 1 hours；Workpiece is placed in fine grinding fluid, and refined using mill；Wherein, include in fine grinding fluid：The parts by weight of water 1000；The parts by weight of citric acid 45 50；The parts by weight of sodium hypophosphite 25 30；The parts by weight of nitric acid 24；The parts by weight of benzene sulfonic acid sodium salt 15 20；The parts by weight of prodan 35 and the parts by weight of polyethylene glycol 45；The combination for having calcium oxide particle and barium carbonate particle is comprised at least in the abrasive particle of disc surface.This case is coordinated fine grinding fluid and special mill that brand-new design goes out, can realize and be refined in a manner of soft in coating surface, so that coating obtains more high-quality flat appearance degree and brightness by the improvement to existing fine grinding technology.

Description

A Fine Grinding Process for Metal Surface Coating

technical field

The invention relates to a grinding process, in particular to a fine grinding process for metal surface coating.

Background technique

The grinding process of metal surfaces has a long history, but generally the surface of a single material is polished, and the grinding requirements generally only need to meet the requirements of flatness or brightness, and do not consider the surface coating of the workpiece to be polished. Therefore, this grinding method is relatively simple and easy to control. However, if you want to polish the precision coating on the metal surface, you must consider whether the grinding itself will affect the performance of this precision coating. For example, when grinding some anti-oxidation or acid and alkali resistant coatings, Due to the uneven process level of the coating, resulting in uneven thickness, or local fine lines and other effects, it is easy to cause the coating to break or wear through during polishing. Moreover, some coatings themselves do not need to be polished too deeply, and only need to smooth the cracks or pits existing in the shallow layer of the surface. Therefore, the grinding method in the prior art is somewhat "rough" for this "delicate" coating, and is difficult to control during construction.

Contents of the invention

Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a fine grinding process for metal surface coatings, which can effectively grind micron-sized dense coatings in a mild manner, so that the coating layer for better appearance flatness or brilliance.

Technical scheme of the present invention is summarized as follows:

A kind of finishing process to metal surface coating, it comprises the following steps:

Step 1) washing the workpiece to be finely ground;

Step 2) aging the workpiece at 60-80°C for 0.5-1 hour;

Step 3) placing the workpiece in an ultraviolet environment for 0.5-1 hour;

Step 4) placing the workpiece in the fine grinding fluid, and using a grinding disc to carry out fine grinding;

Wherein, the following materials by weight are included in the refined grinding liquid:

The abrasive grains on the surface of the grinding disc at least include a combination of calcium oxide particles and barium carbonate particles.

Preferably, in the fine grinding process for metal surface coating, the weight ratio of the calcium oxide particles to the barium carbonate particles is 1: (1.3-1.4).

Preferably, in the fine grinding process for metal surface coating, the rotational speed of the grinding disc is 400-500r/min.

Preferably, in the fine grinding process for metal surface coating, the particle diameters of the calcium oxide particles and barium carbonate particles are 100-200 μm.

Preferably, in the fine grinding process for metal surface coating, the pressure of the grinding disc on the workpiece surface is 90-120N.

The beneficial effects of the present invention are: through the improvement of the existing fine grinding process in this case, combined with the newly designed fine grinding fluid and special grinding disc, it can realize fine grinding on the surface of the coating in a soft way, so that the coating can be more High-quality appearance flatness and brightness.

detailed description

The present invention will be further described in detail below in conjunction with the embodiments, so that those skilled in the art can implement it with reference to the description.

This case proposes an embodiment of the fine grinding process to the metal surface coating, which includes the following steps:

Step 1) wash the workpiece to be finely ground, so that the coating on the surface of the workpiece is soaked by water; because different coatings have different water absorption properties, the washing here does not necessarily require water to penetrate into the coating. Even for water-repellent coatings, the step of washing with water is also meaningful, because water molecules may be embedded in cracks or pits on the surface of the coating, which is beneficial to step 2) during heating and curing, which can produce effective of stress.

Step 2) Place the workpiece at 60-80°C for 0.5-1 hour to mature, and heat the coating on the surface of the workpiece to generate stress; This method of "acceleration" makes the coating defects that would have taken a long time to appear due to the release of stress to appear in advance, thus facilitating the fine grinding treatment of such defects.

Step 3) Place the workpiece in an ultraviolet environment for 0.5-1 hour to force out the tiny cracks on the outermost surface of the workpiece coating as much as possible; this step is similar to step 2), which makes the coating surface The more fragile places are exposed in advance, which is also conducive to the fine grinding of these defects.

Step 4) placing the workpiece in the fine grinding fluid, and using a grinding disc to carry out fine grinding;

Wherein, the refining fluid includes the following materials by weight:

The abrasive grains on the surface of the grinding disc at least include a combination of calcium oxide particles and barium carbonate particles.

The fine grinding liquid and the grinding disc are an organic whole, because the fine grinding liquid is specially customized for the components of the grinding disc, and the two cooperate with each other to obtain the best fine grinding effect. The design principle of this case is to make the grinding disc dissolve the workpiece while grinding the workpiece in the fine grinding liquid. In this way, some "delicate" coatings can be finely ground with a relatively gentle force to prevent excessive grinding. Heavy grinding force will destroy the coating. The combination of calcium oxide particles and barium carbonate particles is used because calcium oxide dissolves slightly faster than barium oxide under acidic conditions, and to maintain almost the same dissolution rate of the two requires the use of the carbonate form of barium, That is, barium carbonate, the dissolution rate of carbonate is faster than that of oxide, on the surface of the grinding disc, barium carbonate first reacts to form barium oxide, then barium oxide and calcium oxide work together on the surface of the workpiece, as the grinding progresses, barium oxide and calcium oxide It is gradually dissolved by the fine grinding liquid. The reason why calcium oxide and barium carbonate are selected among many metal oxides and carbonates is that they have a moderate dissolution rate under weakly acidic conditions, and the hardness of calcium oxide and barium carbonate is also very moderate, which can ensure The grinding disc can effectively polish the coating, and can ensure that the grinding force is not too strong.

In the fine grinding liquid, nitric acid is mainly used to dissolve the acid; citric acid and sodium hypophosphite are mainly used to control the acidity of the fine grinding liquid, which has a certain buffer capacity to protect the coating from strong acid damage; benzenesulfon Sodium phosphate can play the role of heat conduction agent under acidic conditions, it can increase the heat conduction speed of the fine grinding liquid, so as to prevent the grinding disc from grinding and cause the temperature of the fine grinding liquid to be too high; the combination of sodium fluorosilicate and polyethylene glycol is mainly used It is used to adjust the viscosity of the fine grinding fluid and increase the lubricity of the fine grinding fluid to a certain extent, so as to ensure that the coating will not be irreparably damaged when the grinding disc is polished. At the same time, sodium fluorosilicate and poly The combination of ethylene glycol also has a certain defoaming effect to reduce the amount of liquid splashed when the disc rotates in the refining liquid. As a whole, the addition amount of each component should be limited in the refining liquid, if it exceeds the preferred range, it will lead to deviation from the optimal effect of its cooperation with the grinding disc.

As another embodiment of the present application, the weight ratio of calcium oxide particles to barium carbonate particles is preferably 1:(1.3-1.4). Studies have shown that at this ratio, the degree of cooperation between the grinding disc and the refining liquid is the best.

As yet another embodiment of the present application, wherein, the rotational speed of the grinding disc is preferably 400-500 r/min.

As yet another embodiment of the present application, the particle diameters of the calcium oxide particles and the barium carbonate particles are preferably 100-200 μm.

As another embodiment of the present application, the pressure of the grinding disc on the surface of the workpiece is preferably 90-120N.

The fine grinding process in this case can repair or smooth the tiny cracks or pits on the surface of the coating, so that the coating can obtain better flatness and surface brightness.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the use listed in the specification and implementation, it can be applied to various fields suitable for the present invention, and it can be easily understood by those skilled in the art Therefore, the invention is not limited to the specific details without departing from the general concept defined by the claims and their equivalents.

Claims (5)

1. a fine grinding process to metal surface coating, is characterized in that, comprises the following steps: Step 1) washing the workpiece to be finely ground; Step 2) aging the workpiece at 60-80°C for 0.5-1 hour; Step 3) placing the workpiece in an ultraviolet environment for 0.5-1 hour; Step 4) placing the workpiece in the fine grinding fluid, and using a grinding disc to carry out fine grinding; Wherein, the following materials by weight are included in the refined grinding liquid: The abrasive grains on the surface of the grinding disc at least include a combination of calcium oxide particles and barium carbonate particles. 2. the fine grinding process to metal surface coating according to claim 1, is characterized in that, the weight ratio of described calcium oxide particle and barium carbonate particle is 1: (1.3-1.4). 3. The fine grinding process for metal surface coating according to claim 1, characterized in that, the rotating speed of the grinding disc is 400-500r/min. 4. The fine grinding process for metal surface coating according to claim 1, characterized in that the particle diameters of the calcium oxide particles and barium carbonate particles are 100-200 μm. 5. The fine grinding process for metal surface coating according to claim 1, characterized in that, the pressure of the grinding disc on the workpiece surface is 90-120N.