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Machined burrs are very annoying, not afraid! Here's the solution!!!
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Machined burrs are very annoying, not afraid! Here's the solution!!!

Views: 31     Author: Site Editor     Publish Time: 2018-12-05      Origin: www.fuchun-casting.com

1. The universality and harmfulness of burrs

Burr is the inevitable product of metal processing, which is difficult to avoid completely. The existence of burrs not only affects the appearance of products, but also affects the assembly and performance of products, speeds up wear and tear between equipment and reduces service life. With the development of high technology and the improvement of product performance, the requirement of product quality is more and more stringent. It is more important to remove burrs from mechanical parts. The existence of burrs has a great impact on product quality and product assembly, use, dimensional accuracy, shape and position accuracy. Seriously, it makes the whole set of products scrapped and the whole machine can not run.

2. What is the burr?

Burr - refers to a kind of redundant iron chips, commonly known as flying edges, which are formed in the process of cutting, grinding, milling and other similar chips when metal materials are extruded and deformed in the process of machining.

metal surface grinding

3. How to remove burrs?

The methods to solve the burr are as follows: only after the end of product processing, the process of removing burr is added. There are two main methods to remove burrs: chemical removal and physical removal.

Chemistry is mainly used for precise core workpieces with complex shape, deformity, high precision and high cost performance.

Physical classes are used for parts with rough surface and low dimensional accuracy, which are easy to remove by manual operation.

Chemical deburring process is a kind of soaking process, through the way of soaking to achieve the effect of deburring.

The process originated in Germany, which is widely used in the fields of automobile, aerospace and metal parts processing. The suitable parts are automobile parts, stamping parts, oil pump nozzle parts, textile parts, gear parts, bearing parts, electronic components, bearing parts, transmission parts, fasteners, CNC parts and so on.

This process mainly utilizes the difference between burr and the structure of workpiece itself, and achieves the effect of burr removal through the principle of vertical reaction. Our definition of burr is that the thickness of burr is less than 20 wires, which has nothing to do with the height of burr.

Compared with the traditional deburring process, the process is far superior to the traditional process in reliability, repeatability, stability, environmental protection and other aspects; efficient and time-saving, improve product surface finish, safety and reliability, environmental protection and economy, simple operation, can enhance the anti-corrosion and anti-corrosion ability of products.

Physical deburring mainly includes rough (hard contact) cutting, grinding, file, scraper, ordinary (soft contact), belt grinding, grinding, elastic grinding wheel grinding, polishing and washing and other processes with different degrees of automation. The quality of the processed workpiece is often not guaranteed; production costs and personnel costs are very high.



  • What is 'multiple certification'?

    This is where a batch of steel meets more than one specification or grade. It is a way of allowing melting shops to produce stainless steel more efficiently by restricting the number of different types of steel. The chemical composition and mechanical properties of the steel can meet more than one grade within the same standard or across a number of standards. This also allows stockholders to minimise stock levels.

    For example, it is common for 1.4401 and 1.4404 (316 and 316L) to be dual certified - that is the carbon content is less than 0.030%. Steel certified to both European and US standards is also common.

  • What surface finishes are available on stainless steels?

    There are many different types of surface finish on stainless steel. Some of these originate from the mill but many are applied later during processing, for example polished, brushed, blasted, etched and coloured finishes.

    The importance of surface finish in determining the corrosion resistance of the stainless steel surface cannot be overemphasised. A rough surface finish can effectively lower the corrosion resistance to that of a lower grade of stainless steel.

  • Can I use stainless steel at high temperatures?

    Various types of stainless steel are used across the whole temperature range from ambient to 1100 deg C. The choice of grade depends on several factors:

    1. Maximum temperature of operation
    2. Time at temperature, cyclic nature of process
    3. Type of atmosphere, oxidising , reducing, sulphidising, carburising.
    4. Strength requirement

    In the European standards, a distinction is made between stainless steels and heat-resisting steels. However, this distinction is often blurred and it is useful to consider them as one range of steels.

    Increasing amounts of Chromium and silicon impart greater oxidation resistance. Increasing amounts of Nickel impart greater carburisation resistance.

  • Can I use stainless steel at low temperatures?

    Austenitic stainless steels are extensively used for service down to as low as liquid helium temperature (-269 deg C). This is largely due to the lack of a clearly defined transition from ductile to brittle fracture in impact toughness testing.

    Toughness is measured by impacting a small sample with a swinging hammer. The distance which the hammer swings after impact is a measure of the toughness. The shorter the distance, the tougher the steel as the energy of the hammer is absorbed by the sample. Toughness is measured in Joules (J). Minimum values of toughness are specified for different applications. A value of 40 J is regarded as reasonable for most service conditions.

    Steels with ferritic or martensitic structures show a sudden change from ductile (safe) to brittle (unsafe) fracture over a small temperature difference. Even the best of these steels show this behaviour at temperatures higher than -100 deg C and in many cases only just below zero.

    In contrast austenitic steels only show a gradual fall in the impact toughness value and are still well above 100 J at -196 deg C.

    Another factor in affecting the choice of steel at low temperature is the ability to resist transformation from austenite to martensite. 

  • Is stainless steel non-magnetic?

    It is commonly stated that “stainless steel is non-magnetic”. This is not strictly true and the real situation is rather more complicated. The degree of magnetic response or magnetic permeability is derived from the microstructure of the steel. A totally non-magnetic material has a relative magnetic permeability of 1. Austenitic structures are totally non-magnetic and so a 100% austenitic stainless steel would have a permeability of 1. In practice this is not achieved. There is always a small amount of ferrite and/or martensite in the steel and so permeability values are always above 1. Typical values for standard austenitic stainless steels can be in the order of 1.05 – 1.1. 

    It is possible for the magnetic permeability of austenitic steels to be changed during processing. For example, cold work and welding are liable to increase the amount of martensite and ferrite respectively in the steel. A familiar example is in a stainless steel sink where the flat drainer has little magnetic response whereas the pressed bowl has a higher response due to the formation of martensite particularly in the corners.

    In practical terms, austenitic stainless steels are used for “non-magnetic” applications, for example magnetic resonance imaging (MRI). In these cases, it is often necessary to agree a maximum magnetic permeability between customer and supplier. It can be as low as 1.004.

    Martensitic, ferritic, duplex and precipitation hardening steels are magnetic.

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