Who invented scraping in machinery and what is scraping? What are the characteristics of scraping?

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Scraping refers to the clamping process of scraping trace metals on the surface of the machined workpiece with a scraper to improve the accuracy of the surface shape and improve the contact between the mating surfaces. The characteristics of scraping are:The amount of stock removal is small, and high dimensional accuracy, geometric accuracy, contact accuracy and good surface roughness can be obtained.

Commonly used tools for fitters to scrape.

1. Calibration tool Calibration tool is a tool used to grind contact points and check the accuracy of the scraping surface, also known as grinding tools. The commonly used ones are the following:

1) Standard flat plate. Used to inspect wide planes.

2) Check the flat ruler. It is used to inspect long and narrow planes. The bridge-shaped flat ruler is used to check the straightness error of the guide rail surface of the machine tool; There are two kinds of square feet, single-sided and double-sided.

3) Angle flat ruler. It is used to inspect the combined plane of two scraping surfaces at an angle, such as a dovetail rail face. Its shape is ° and so on.

Second, the scraper is the main tool in the scraping work, which requires the cutter head part to have sufficient strength, and the cutting edge must be sharp.

According to different scraping surfaces, scrapers can be divided into two categories: flat scrapers and curved scrapers

1) Flat scraper. It is mainly used to scrape flat surfaces, such as flat plates, plane guide rails, workbenches, etc., and can also be used to scrape outer surfaces. According to the different requirements of the scraped surface accuracy, it can be divided into three types: coarse scraper, fine scraper and fine scraper.

2) Curved scraper. It is mainly used to scrape the inner surface, such as the inner bore of the sliding bearing. Curved scrapers come in a variety of shapes, such as triangular scrapers and snakehead scrapers.

A clamping process that scrapes off trace metals on the surface of the machined workpiece with a scraper to improve the accuracy of the surface shape and improve the contact between the surfaces. Scraping is an important method for the final finishing of various profiles (such as machine tool guide surfaces, connecting surfaces, bearings, mating spheres, etc.) in machine manufacturing and repair.

Scraping is generally operated by the fitter's hand-held scraper, and there are two methods: plane scraping and curved surface scraping. The scraper is generally made of carbon tool steel or bearing steel, the rear end is equipped with a wooden handle, the cutter body part is hardened to about HRC60, and the cutting edge is ground and can be re-ground after wear. The surface of the workpiece is first machined with a scraping allowance of mm.

There are two types of surface scraping operations: push scraping and pull scraping. Pushing and scraping mainly depends on the arm force and the pushing and compression of the crotch, and the cutting force is large, which is suitable for large-area rough scraping and semi-fine scraping. Scraping only relies on arm force to compress and pull back, the cutting force is small, but the scraping length is easy to control, suitable for fine scraping and scratching.

[Invented by Shanxi people].

In order to prevent the "Han Chinese" from rebelling and revolting, all the metal of every household was confiscated, and it was stipulated that ten households should use a kitchen knife to cut vegetables and cook in turn, and then return it to Tatar for safekeeping. One day at noon, an old woman mixed the sticks, sorghum noodles into a dough, and asked the old man to take the knife. As a result, the knife was taken away by someone else, and the old man had to return, and when he came out of the Tatar gate, his foot was touched by a thin iron sheet, and he picked it up and carried it in his arms.

When I got home, the pot was boiling loudly, and the whole family waited for the knife to cut the noodles to eat. But the knife was not retrieved, and the old man was so anxious that he suddenly remembered the iron sheet in his arms, so he took it out and said: Just use this iron sheet to cut the noodles!

When my wife saw that the iron sheet was thin and soft, she muttered: How can such a soft thing cut noodles. The old man said angrily

"Cut" if you don't move, "cut". The word "chop" reminded his wife, she put the dough on a wooden board, picked it up with her left hand, held an iron sheet in her right hand, stood by the pot of boiling water to "chop" the noodles, one by one the dough pieces fell into the pot, after cooking, they were fished into the bowl, poured the marinade and let the old man eat first, and the old man said while eating: "It's very good, it's very good, you don't need to take a kitchen knife to cut noodles in the future."

In this way, one spread ten, ten spread hundreds, and spread all over the land of Jinzhong. So far, Pingyao, Jiexiu, Fenyang, Xiaoyi and other counties in Jinzhong, both men and women will cut noodles. Later, "Fengyang" out of Emperor Zhu (Zhu Yuanzhang) unified China and established the Ming Dynasty, this kind of "cut noodles" spread in the small vendors in society, and after many reforms, it evolved into the current knife cut noodles.

The knife-cut noodles are soft and hard, soft and tough, poured marinade, or fried or cold dressed, all have unique flavors, such as a little Shanxi old vinegar food.

Scraping is the operation of scraping off a thin layer of metal on the machined surface of a workpiece with a scraper. Scraping is the precision machining of fitters, and it is also one of the important manual operation skills of fitters. The surface roughness of the scraped surface.

RA is reachable and has good straightness. In order to increase the contact area, reduce friction and wear, and improve the service life of the parts, the matching sliding surfaces on the parts often need to be scraped, such as machine tool guide rails and sliding bearings.

Wait. The cutting layer of each scraping is very thin, the production efficiency is low, and the labor intensity is large, so the machining allowance can not be large, such as the machining plane allowance of 500mm and 100mm does not exceed.

The principle of scraping is: a layer of indicating agent is applied between the workpiece and the standard tool or the workpiece with it, and after the research is carried out, it is displayed on the higher part of the workpiece, and then the scraper is used to make a micro cut to scrape off the metal layer at the higher part. After repeated grinding and scraping, the workpiece can achieve the correct shape and precision.