Analysis on the Design and Selection of Stainless Steel Electric Kettle and Its Realization Process
Research background
Nowadays, there are many types and brands of electric kettles on the market. The more famous ones are Topu Creation, SKG, Hemisphere, Yijiahui, Midea, Joyoung, Supor and other brands. According to the material of the kettle body, electric kettles are divided into plastic kettles, stainless steel electric kettles, and multi-layer anti-scalding kettles. In terms of heat preservation function, it is divided into heat preservation and non-heat preservation, active heat preservation, and passive heat preservation. As a new type of material, stainless steel is widely used. (Stainless steel refers to steel that is resistant to weak corrosive media such as air, steam, and water, and chemically corrosive media such as acid, alkali, salt, etc., also known as stainless acid-resistant steel)
Research object
1. Material:
(1) DDQ material: refers to materials used for deep drawing (punching) purposes. The main characteristics of this material are higher elongation (≧53%), lower hardness (≦170%), and internal grain grade Between 7.0 and 8.0, the deep drawing performance is excellent. Many companies that produce thermos flasks and pots generally have a relatively high processing ratio (BLANKING SIZE/product diameter). The materials used are mainly used for these products with higher processing ratios. Of course, products with a processing ratio of more than 2.0 generally have a higher processing ratio. It takes several passes of stretching to complete. If the extension of the raw material cannot be achieved, the product is prone to cracks and pull-through when processing deep-drawn products, which will affect the qualified rate of finished products.
(2) General materials: Mainly used for materials other than DDQ purposes. This material is characterized by relatively low elongation (≧45%), and relatively high hardness (≦180), and the internal grain size is Between 8.0 and 9.0, compared with DDQ materials, its deep drawing performance is relatively poor. It is mainly used for products that can be obtained without stretching, such as spoons, spoons, forks, electrical appliances, steel pipes, etc. . But it has an advantage compared with DDQ material, that is, the BQ property is relatively better, which is mainly due to its slightly higher hardness.
2. Advantages:
(1) Corrosion resistance
Most stainless steel products require good corrosion resistance, such as class I or II tableware, kitchen utensils, water heaters, and water dispensers.
(2) Heat resistance
Heat resistance refers to the ability of stainless steel to maintain its excellent physical and mechanical properties at high temperatures.
(3) Surface protection
Stainless steel is an extremely thin, strong, dense, and stable chromium-rich oxide film (protective film) formed on its surface. Prevent oxygen atoms from continuing to infiltrate and continue to oxidize, and gain resistance to rust.
(4), easy to polish
Stainless steel products generally go through the process of polishing during production, and only a few products such as water heaters and water dispenser inner tanks do not need to be polished. Therefore, this requires the good polishing performance of the raw material.
(5) Good strength
Compared with quantitative materials, stainless steel materials have 8-10 times the thrust strength of plastic products.
Three, stainless steel kettle
1. Advantages
Stainless steel electric kettle is a product used to gradually replace plastic electric kettles and aluminum electric kettles with the development of the times. At present, stainless steel electric kettles generally have triple or more safety protection settings. That is, the water will automatically cut off when it is boiling; if it is dry, it will cut off automatically; if it is overheated, it will cut off automatically.
2. Design features
Steam switch, when the water boils, the steam switch will act to cut off the kettle; dry boil protection, if the steam switch is not activated, the water will continue to boil and decrease. When the water is below the lowest level or boiled dry, another bimetal on the temperature control will act to power off the kettle; if all of the above have no effect, as the temperature rises, a plastic push rod in the thermostat will melt, causing the kettle to power off.
3. Comparative advantage
“Heat fast” is the most basic requirement for stainless steel electric kettles. For this reason, the original heating coil has been transformed into a wider heating chassis, which is more beautiful and practical, and solves the loopholes that the scale is difficult to clean; secondly, it is more heating For practical results, it is often possible to boil half a liter to a liter of water in 3-5 minutes. “Drinking water should be healthy” is the consensus of everyone, so install a few “safety nets” in the stainless steel kettle.
Four, processing technology
1. Stainless steel process
The annealed stainless steel should be chemically blackened first, and the oily ones should be degreasing first to remove the oil → water washing → electrolytic fine polishing → water washing → film removal → water washing → blow-drying.
2. Process flow of stainless steel surface:
The various surface processing of stainless steel broadens its application field-different surface processing makes the surface of stainless steel different, making it unique in its application. The corrosive environment requires a smooth surface because the surface is smooth and not easy to accumulate. The deposit of dirt will cause stainless steel to rust and even cause corrosion.
3. The basic types of surface processing
There are roughly five types of surface processing that can be used for stainless steel, and they can be combined to transform into more final products. The five categories are rolling surface processing, mechanical surface processing, chemical surface processing, textured surface processing and color surface processing.
(1) Rolling surface processing There are three basic rolling surface processing for plates and strips, which are represented by the production process of plates and strips.
A. After hot rolling, annealing, pickling, and descaling. The surface of the treated steel plate is dull surface, a bit rough.
B. If the surface of A is processed well, it is also a dull surface. After cold rolling, annealing, descaling, and finally light rolling with a matt roller.
C. Except for the last light cold rolling with a polishing roll after annealing and descaling, the other processes are the same as B, the surface is slightly shiny, and it can be polished.
D. Bright Annealing: This is a reflective surface, which is rolled by polishing rollers and finally annealed in a controlled atmosphere. Bright annealing still maintains its reflective surface and does not produce oxide scale.
(2) Polished surface processing
A. The surface is evenly ground, and the abrasive grain size is 80-100.
B. The rough surface is polished, and the surface has uniform straight lines. It is usually made by polishing with an abrasive belt with a grain size of 180-200 on a 2A or 2B plate at one time.
C. One-way surface processing, low reflectivity, this surface processing may be the most widely used in architectural applications. The process step is to first polish with coarse abrasives, and finally, grind with abrasives with a particle size of 180.
D. It is a further improvement to C, which is to polish the surface of C with a Tampico polishing brush in abrasive and oil media.
E. Bright polishing is to polish the surface that has been ground very fine but still has abrasion marks.
F. Mirror surface processing, continuous polishing of stainless steel with fine abrasive, and then polishing with very fine polishing paste.
4. Processing technology of stainless steel electric kettle
The market prospects of electric kettles are extremely broad, and traditional manual polishing methods have severely restricted the development of this industry.
Aiming at the actual background of electric kettle production, developed an automatic mechanical polishing system for electric kettles. Analyze the material composition and polishing characteristics of the stainless steel electric kettle, and carry out corresponding experiments based on the polishing system to study the influence of process parameters such as grinding depth, abrasive tangent speed, workpiece speed, and axial feed speed on the polishing quality. The orthogonal test method is used to optimize the process parameters, improve the polishing quality and efficiency, and provide a theoretical basis for the automatic mechanical polishing process of electric kettles and other similar products.