CN101054499A - H62 brass polishing liquid and its preparing process - Google Patents

Abstract

The H62 special polishing liquid for brass and a preparation method thereof belong to the field of precision mechanical polishing. A special polishing fluid developed for the ordinary polishing fluid that cannot satisfy the precision mirror processing of plastic metal materials. The polishing liquid is made by mixing Al ₂ O ₃ fine powder with a particle size of 0.5-1.0 μm, kerosene, lard, vegetable oil and spindle oil; among them, Al ₂ O ₃ fine powder is used as abrasive, kerosene is used as solvent, lard, vegetable oil and spindle oil The mixed liquid is used as an additive; the polishing liquid is prepared by volume ratio from 2% lard, 2% abrasive, 8% vegetable oil and spindle oil mixture, and 88% kerosene; the polishing liquid can process surface quality Uniform, H62 brass workpiece with a surface roughness value of 0.008μm has the characteristics of no corrosion of the workpiece, effective relief of mechanical scoring, and good surface quality. It can be used for decorative processing of plastic metal materials, and material metallography Surface polishing before analysis.

Description

H62 brass polishing liquid and preparation method thereof

technical field

The invention relates to a special polishing liquid in the field of precision mechanical polishing, which is a liquid polishing mixture. It is mainly used for precision mechanical polishing of typical plastic metal material H62 brass, and is also suitable for polishing other plastic metal materials with similar properties. The polishing liquid can be widely used in the fields of precision machinery manufacturing, precision instruments, and aerospace manufacturing engineering.

Background technique

The precision polishing of plastic metals usually adopts chemical or electrochemical processing methods, and the polishing liquid used is usually an acidic solution, which is not easy to process a uniform surface quality. In chemical mechanical polishing, a chemical mechanical polishing fluid with good performance must be used to achieve the desired polishing effect, and usually the polishing fluid is expensive. The traditional polishing liquid generally does not contain abrasives, and the abrasives are generally embedded in the polishing tool which is softer than the workpiece. During polishing, as the polishing tool wears out, the polishing liquid is added for grinding.

Contents of the invention

The purpose of the present invention is to develop a special polishing liquid for the precision mechanical polishing of H62 brass, a typical plastic metal material, because ordinary polishing liquid cannot well meet the precision mirror processing of plastic metal materials. In use, you only need to add an appropriate amount of polishing liquid to the polishing pad, and place the workpiece for processing. The operation is simple and the pollution is small.

The H62 brass polishing liquid of _the present invention is characterized in that: the polishing liquid is formed by mixing _Al2O3 micropowder, kerosene, lard, vegetable oil and spindle oil with a particle size of 0.5～1.0 μm; wherein _{the Al2O3} micropowder is Abrasives, kerosene as a solvent, a mixture of lard, vegetable oil and spindle oil as an additive; the polishing liquid consists of 2% lard, 2% abrasive, 8% vegetable oil and spindle oil, 88% made from kerosene;

According to different ambient temperatures, there are two schemes for the preparation of additives: when the ambient temperature is 20-30°C, the volume ratios of the melted lard, vegetable oil, and spindle oil are 20%, 40%, and 40% respectively; when the ambient temperature is 10 At ~20°C, the volume ratios of molten lard, vegetable oil and spindle oil are 30%, 45% and 35%, respectively.

The content of the invention includes the process method of material selection, proportioning and preparation of typical plastic metal H62 special polishing liquid for brass. The polishing fluid mainly plays the role of lubrication, cleaning, cooling, film formation, and micro-cutting, and requires the specimen material to be removed evenly. According to the performance characteristics of H62 brass, the main components of the selected polishing liquid include: Al ₂ O ₃ powder with a particle size of 0.5-1.0 μm, kerosene, vegetable oil, lard, and spindle oil. Among them, the abrasive plays a role in micro-cutting, kerosene as a solvent mainly plays the role of lubricating, cooling, cleaning and transporting the abrasive, and the ingredients in the additive mainly play the role of wrapping and evenly dispersing the abrasive, relieving the mechanical action, lubricating, and forming a film on the surface of the workpiece effect. When configuring, first heat the lard to melt, stir it with the same volume ratio of abrasives to form a paste, then add kerosene with a volume ratio of 88% to the stirred hot paste mixture, shake it well and place it to room temperature, then According to the difference of ambient temperature, add the vegetable oil and spindle oil shown in Table 1, and stir evenly to obtain the desired polishing liquid.

The preparation method of described H62 brass polishing liquid is characterized in that, comprises the following steps:

① Heat and melt 2% lard;

② Add Al ₂ O ₃ micropowder with a particle size of 0.5-1.0 μm in the volume ratio of 1:1 to the melted lard, and stir evenly;

③ Add 88% kerosene to the above-mentioned mixture of lard and Al ₂ O ₃ micropowder, mix evenly, cool to room temperature for later use;

④ When the ambient temperature is 10-20°C, add 4.5% vegetable oil and 3.5% spindle oil and mix evenly; when the ambient temperature is 20-30°C, add 4% vegetable oil and 4% spindle oil and mix evenly to obtain H62 brass polishing fluid;

The above percentages are the volume percentages of each component in the polishing liquid.

Table 1 Proportion of additives

The special polishing liquid of the present invention is different from the traditional polishing liquid, and belongs to the liquid polishing mixture containing abrasives. The polishing liquid has the following characteristics:

1): It does not corrode the workpiece and does not need additional abrasives during polishing;

2): Effectively alleviate the mechanical scoring effect, and the processed surface quality is good.

Detailed ways

The present invention examines the polishing effect of the polishing liquid with specific examples and specific experiments, and illustrates the superiority of the polishing liquid of the present invention by comparing the processing effects with other commonly used polishing liquids.

Example 1: When the ambient temperature is 16°C

(1) Implementation conditions

BDE-1B frequency conversion and speed regulation optical two-axis grinding and polishing machine, 2205 surface roughness measuring instrument, special polishing liquid, cotton polishing pad, H62 brass workpiece with a diameter of 80mm and a thickness of 6mm. The polishing parameters are: frequency 12～ 18Hz, polishing pressure 0.35-0.55N/cm ² , eccentricity 15-20mm, polishing time 30min.

The preparation method of special polishing liquid is as shown above:

(2) Proportion of special polishing liquid

Each component by volume ratio is: 2% lard, 2% abrasive, 4.5% vegetable oil, 3.5% spindle oil and 88% kerosene.

(3) The preparation method is as follows, and the following percentages are the volume percentages of the polishing liquid.

① Heat and melt 2% lard;

② Add Al ₂ O ₃ micropowder to the melted lard at a volume ratio of 1:1, and stir evenly;

③Add 88% kerosene to the above-mentioned mixture of lard and Al ₂ O ₃ micropowder, mix evenly, and cool to room temperature for later use;

④ Evenly mix 4.5% vegetable oil and 3.5% spindle oil, add to the above mixed solution, and stir evenly.

The polishing effect of this embodiment is shown in Table 2.

Example 2: When the ambient temperature is 25°C

(3) Implementation conditions

BDE-1B frequency conversion and speed regulation optical two-axis grinding and polishing machine, 2205 surface roughness measuring instrument, special polishing liquid, cotton polishing pad, H62 brass workpiece with a diameter of 80mm and a thickness of 6mm. The polishing parameters are: frequency 12～ 18Hz, polishing pressure 0.35-0.55N/cm ² , eccentricity 15-20mm, polishing time 30min.

The preparation method of special polishing liquid is as shown above:

(4) Proportion of special polishing liquid

The components are respectively by volume: 2% lard, 2% abrasive, 4% vegetable oil, 4% spindle oil and 88% kerosene.

(3) The preparation method is as follows, and the following percentages are the volume percentages of the polishing liquid.

① heating and melting lard with a volume ratio of 2%;

② Add Al ₂ O ₃ micropowder to the melted lard at a volume ratio of 1:1, and stir evenly;

③ Add kerosene with a volume ratio of 88% to the above-mentioned mixture of lard and _Al2O3 micropowder, mix _evenly , and cool to room temperature for later use;

④ Evenly mix vegetable oil and spindle oil with a volume ratio of 4%, add to the above mixed solution, and stir evenly.

The polishing effect of this embodiment is shown in Table 3.

Polishing effect comparison experiment: the ambient temperature is 23°C.

(1) Experimental conditions

BDE-1B frequency conversion and speed regulation optical two-axis grinding and polishing machine, 2205 surface roughness measuring instrument, special polishing liquid, cotton polishing pad, H62 brass workpiece with a diameter of 80mm and a thickness of 6mm. The polishing parameters are: frequency 12～ 18Hz, polishing pressure 0.35-0.55N/cm ² , eccentricity 15-20mm, polishing time 30min.

(2) Preparation of other commonly used polishing fluids

Other commonly used polishing liquids suitable for precision polishing of plastic metal materials usually use SiC as the abrasive, and the ratio is: a homogeneous mixture of abrasive and mixed fat with a volume ratio of 30%, 20% vegetable oil, and 50% kerosene.

Preparation method:

①Heating and melting stearic acid granules (C ₁₇ H ₃₅ COOH), 40% paraffin (cypress oil) and 20% beeswax with a mass ratio of 40%, mixed to form a mixed fat, and then filtered for later use;

②Add the SiC abrasive with a particle size of 3.5 μm to 5 μm in the volume ratio of 1:1 to the above mixed fat and stir until the mixed fat evenly covers the abrasive;

③ Add vegetable oil with a volume ratio of 20% and stir until completely dissolved;

④ Pour kerosene with a volume ratio of 50% into the above solution and stir. After the solvent is completely dissolved, cool down to room temperature.

(3) The preparation method of the special polishing liquid of the present invention is the same as that described in Example 2.

The polishing effects of these two polishing solutions are compared in Table 4.

Table 2H62 Surface roughness of brass after polishing

Table 3H62 Surface roughness of brass after polishing

Table 4 Comparison results of surface roughness processed by two kinds of polishing fluids Process conditions Surface Roughness (Ra) Polishing frequency (Hz) Polishing pressure (N/cm ² ) Eccentric distance(mm) polishing pad Conventional Polishing Fluid Special Polishing Fluid 12～15 0.25～0.4 15～20 cotton polishing pad 0.023μm 0.008μm .

Claims (2)

1, a kind of H62 brass polishing liquid is characterized in that: polishing fluid is the Al of 0.5～1.0 μ m by particle diameter ₂O ₃Micro mist, kerosene, lard, vegetables oil and spindle oil mix; Al wherein ₂O ₃Micro mist is an abrasive material, and kerosene is made solvent, and the mixed solution of lard, vegetables oil and spindle oil is made additive; Polishing fluid is formulated by the mixed solution of 2% lard, 2% abrasive material, 8% vegetables oil and spindle oil, 88% kerosene by volume;

According to the difference of envrionment temperature, the preparation of additive has two kinds of schemes: when envrionment temperature was 20～30 ℃, the volume ratio of the lard of fusing, vegetables oil and spindle oil was respectively 20%, 40% and 40%; When envrionment temperature was 10～20 ℃, the volume ratio of the lard of fusing, vegetables oil and spindle oil was respectively 30%, 45% and 35%.

2, the preparation method of H62 brass polishing liquid according to claim 1 is characterized in that, may further comprise the steps:

1. with 2% lard heat fused;

2. 1: 1 by volume adding particle diameter is the Al of 0.5～1.0 μ m in the lard of fusing ₂O ₃Micro mist stirs;

3. 88% kerosene is added above-mentioned lard and Al ₂O ₃In the mixed solution of micro mist, uniform mixing, it is standby to be cooled to room temperature;

4. when envrionment temperature is 10～20 ℃, add 4.5% vegetables oil and 3.5% spindle oil uniform mixing; When envrionment temperature was 20～30 ℃, the vegetables oil of adding 4% and 4% spindle oil uniform mixing obtained the H62 brass polishing liquid;

Above per-cent accounts for the volume percent of this polishing fluid for each composition.