Scratch - that ... description of the technology. Bench scraper

Locksmith measures aimed at ensuring the smoothness of the surfaces of different materials, represent a group of operations. These include common techniques of grinding, propilivanija, cutting and polishing. Combines these methods of finishing surfaces application of abrasives with varying degrees and configuration granularity. In many respects they are similar, but have critical differences scratch. It is a technique that enables high precision to obtain smooth surface of the workpiece, which allows the master to ensure its tight coupling with other materials.

General information about the technology

Surgery is most commonly used in metal, but in some cases similar methods process plastic and wood surfaces. The technology is the elimination of pronounced bumps on the product. That is, using a special tool provided by lapping irregularities. To understand the degree of accuracy it should be noted that the height of the removed layer is calculated in microns. From the point of view of the management of the operation, scraping – mechanical hand, but not automated process. It uses small tools, but machines and machine mechanisms do not yet have wide use in this field. The feature of this method is that it is used in work with non-standard rounded surfaces where required to take account of gradient of radial. For example, it can be curved and cylindrical products.

Preparing to scratch

Use the scraping caused by problems of obtaining high precision in terms of surface smoothness. Therefore, the use of a specialized tool to achieve such a result when working with materials having a rough surface, is not justified. Accordingly, the workpiece initially are the stages of the initial Stripping and sanding and even polishing. The relevance of recent transactions is determined by what parameters we are implementing specific locksmith services and, in particular, scratch. Skilled craftsmen are practicing the use of checking details. This is billets, which are exemplary for the resulting products. Also at this stage should be ready auxiliary equipment with which the operator will carry out the individual process steps. For example, can apply a special primer or oil paint.

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The Technique of scraping

After executing the preparatory processing of action first thing in the working surface is applied a special paint. Its objective is the designation of the lapping pattern, and identify the most prominent on the surface. Sometimes large areas are zoned into separate areas, depending on the complexity of their bringing to a desired state. Anyway, according to the drawing and scraping. This means that the processing is not continuous space, and in a sense the point. The efficiency and quality of the cut is determined and the frequency that produced the sweep. Once the planned volume of the slice was done, the master makes another surface coating paint, which again brings out bulges and bumps. Thus, the quality of scraping. By the way, the cycle may be repeated several times depending on how each session brings the surface of the workpiece to the pattern.

Technical parameters of scraping

In the case of treatment of flat surfaces, and finishing of curved products technology allows to obtain smoothness with an allowance irregularities of the order of 0.002 mm with a length of 1000 mm. for Example, pad size 25 x 25 mm² can have up to 30 processed paint spots on the way out. The number of spots determines the level of precision scraping. Thin surfaces are considered, where there are more than 22 spots. And opposite, rough to be considered the product, the surface of which is not more than 6 spots. Again, the number of processed paint the remaining Islands will be calculated on a square 25 x 25 mm². Depending on this parameter are defined and the types of scraping – between the fine and coarse cut also produce exact and final revision. In some specific case, you should get a result – it depends on technical specifications. Not always required to obtain a thin slice with the presence of 30 spots. Sometimes to meet the requirements to tightness enough and rough handling. But harsh scraping can not be compared with similar characteristics in grinding – in both cases we are talking about different orders of the remaining height of the bumps.

Used the tool

In the classic version scraper is a metal rod, provided with cutting edges. An important feature of the device is the base, made of carbon steel. Due to such alloy scraper bench effectively works with most metal products. Also, some models can be supplied with specialplates with nozzles having different properties – accordingly, the snap-in is chosen for a specific task.

It has been noted that the scraping is carried out mainly with hand tools. This method allows to obtain high quality results but has the disadvantage – this operation is time consuming, requires considerable physical effort. Therefore, if special quality requirements are not provided, use the insert pneumatic and electrical machines. Mechanized scraping of parts due to the lack of adjustment of the pressure exerted on the surface does not always give accurate treatment, but compares favorably with the manual method, the speed of operations.

Pros and cons of technology

The Main disadvantage of scraping is the cost and complexity of the process. This is one of the most troublesome plumbing operations, resorted to only in special cases. Even hand technique, involving the use of simple tool, it will be expensive because of the need to use consumables in the form of doctor paint. The advantages that still a lot from this treatment method, include obtaining a precision cut. A similar effect can not provide other locksmith services (with the exception of technological equipment for grinding and polishing). But in this case will have the same disadvantages – grinding machine with high productivity operate on a different principle and are not always able to achieve a similar quality of cut. And that's not to mention the cost of the equipment itself, which can surpass pneumatic and electric scrapers.

Applying the scraper bench?

Practice shows that the scraping in the professional field perform plumbing work takes about 20% of all transactions. However, a niche in which is used the produced thus, the products are quite limited. Basically, scrapers are used in the manufacturing processes of parts for machine tools, machinery, industrial equipment, etc. is Important not to forget that scratch – a method of producing a high precision in terms of smoothness of surfaces. Moreover, the surfaces themselves may be curved. For example, high-quality bearings with an optimal radial planes can only be obtained this way.

Conclusion

The Complexity of bringing metal surfaces to a condition where they will not be even visible to the eye irregularities identified and high responsibility of the contractor. The fact that the quality operation (scraping) involves the manual revision is directly dependent on the skills of the master. An experienced mechanic should consider in the process a lot of nuances. These include doctor and selection of paint, and the use of a particular stroke frequency of the instrument and other details, which will determine the merits of the end result.