Insulating tape is pvc electrical tape, because it has a rubber surface, it can be pasted with anything. However, the insulating self-adhesive tape can only stick to itself and will not stick to other objects. The general insulating self-adhesive tape will have a layer of plastic film. As long as this layer of film is removed, it can be with itself. It is pasted together and has a little flexibility. It is generally used for waterproofing, high temperature resistance (high current) or for wrapping around the cable.
pvc electrical tape refers to the tape used to prevent leakage and provide insulation when used by electricians. It has good insulation and pressure resistance, flame retardant, weather resistance and other characteristics, suitable for wire connection, electrical insulation protection and other characteristics.
pvc electrical tape is a kind of polyvinyl chloride insulating tape with excellent function, economical and practical. It has excellent wear resistance, moisture resistance, acid and alkali resistance, and resistance to environmental changes (including ultraviolet rays). It has high dielectric strength, good formability, and good mechanical maintenance can be obtained with less dosage.
When in use, it is coiled in a semi-stacked way. In order to make the wrapping uniform and regular, it is necessary to apply a tensile force. In the parallel connection, the tape needs to be wrapped around the end of the wire, and then folded back to leave a rubber pad to prevent gouging. When wrapping the final layer, it cannot be stretched to prevent the flag from being pulled.
At present, there are many brands of pvc electrical tapes in the domestic market, but their quality varies. pvc electrical tapes have high requirements on the functions and safety of the tapes. Some defective pvc electrical tapes often bring severe results.
pvc electrical tape has excellent insulation functions such as weather resistance, abrasion resistance, acid and alkali resistance, aging resistance, flame retardancy, wrapping and conformability. It is widely used in all walks of life and is suitable for wire coiling, insulation protection, color marking, etc.
With the gradual popularity of modern architectural styles, modern decoration styles have also become a popular choice for people when decorating houses. It seems that choosing some modern lighting with simple style has become a fashion. Among them, outdoor lights seem to be favored by many consumers.
Modern outdoor lights are generally energy-saving. Energy-saving energy without pollution is environmental protection. DC drive, ultra-low power consumption (0.03-0.06 watts per tube) electro-optical power conversion is close to 100%, the same lighting effect is more than 80% energy-saving than traditional light sources. With long life span, some people call the wall light source a longevity lamp, which means a lamp that never goes out. Solid cold light source, epoxy resin encapsulation, there is no loose part in the lamp body, there are no shortcomings of filament light, easy to burn, thermal deposition, light decay, etc., and the service life can reach 60,000 to 100,000 hours, which is 10 times longer than that of traditional light sources. the above. It has better environmental protection benefits. There is no ultraviolet and infrared in the spectrum, no heat, no radiation, low glare, and waste can be recycled, no pollution, no mercury, cold light source, safe to touch, and it is a typical green lighting source.
Mirrea’s modern outdoor lights use a patented waterproof design with a cap-shaped upper cover and a plug-shaped lower cover. The outside of the bulb is wrapped with an aluminum cylinder to prevent rust and corrosion. The easy-to-install two-piece rotatable mounting bracket and fixing nut are on the front side of the wall panel and the metallic black color tone gives a more concise but connotative feeling.
Classification and application of CNC tools (cnc machining)
- Tool classification
Cutting tools are often divided into turning tools, hole processing tools, milling tools, broaches, thread cutting tools, gear cutting tools, automatic lines and CNC machine tools and reamers according to the processing methods and specific uses.
Tools can also be classified in other ways,
For example, according to the materials used, they are divided into high speed steel tools, cemented carbide tools, ceramic tools, cubic boron nitride (CBN) tools and diamond tools;
According to the structure, it can be divided into integral tool, insert tool, clamping tool and composite tool;
According to whether it is standardized, it can be divided into standard tools and non-standard tools
- Introduction of common cutting tools
1 turning tool
Turning tool is the most widely used tool in metal cutting without signature. It can be used to machine outer circle, end plane, thread and inner hole on lathe, as well as to cut groove and cut off. Turning tools can be divided into integral turning tools, welding assembly turning tools and mechanical clamping tools. Turning tools with mechanically clamped blades can be divided into machine tool turning tools and indexable turning tools. The cutting performance of mechanical clamping turning tool is stable, workers do not have to sharpen the tool, so it is applied more and more in modern production.
2-hole machining tool
Generally speaking, there are two kinds of tools for hole machining
One is the tool for machining holes from solid materials, such as twist drill, center drill and deep hole drill;
The other is the tool that reprocesses the existing hole on the workpiece, such as reamer, reamer and boring tool.
3 milling cutter
Milling cutter is a kind of widely used multi edge rotary cutter, which has many kinds. According to the use, there are:
1) For machining plane, such as cylindrical plane milling cutter, end milling cutter, etc;
2) For machining groove, such as end mill, T-shaped cutter and angle mill, etc;
3) For machining formed surface, such as convex semicircle and concave semicircle milling cutter and milling cutter for machining other complex formed surface. The productivity of milling is generally high, and the surface roughness value is large.
4 broach
Broach is a kind of multi tooth tool with high machining accuracy and cutting efficiency. It is widely used in mass production and can process various inner and outer surfaces. Broaches can be divided into internal Broaches and external broaches according to the surface of the workpiece. When machining with broach, in addition to selecting the rake angle and rake angle of the cutter teeth according to the material of the workpiece, and determining the broach size according to the size of the machined surface of the workpiece (such as the diameter of the circular hole), two parameters need to be determined
(1) The angle of tooth rise AF [i.e. the difference between the radius or height of the front and rear cutter teeth (or tooth group)];
(2) Pitch P [the axial distance between two adjacent cutter teeth].
5 thread cutter
Thread can be processed by cutting and rolling.
6 gear cutter
Gear cutter is a kind of cutter used for machining gear tooth profile. According to the working principle of cutting tools, gears are divided into forming gear tools and generating gear tools. The commonly used forming gear cutters include disc gear milling cutter and finger gear cutter. The commonly used generating gear cutters include gear shaper cutter, gear hob cutter and gear shaving cutter. When selecting gear hob and gear shaper cutter, the following points should be paid attention to:
(1) The basic parameters of the cutter (module, tooth profile angle, addendum height coefficient, etc.) should be the same as those of the gear to be machined.
(2) The accuracy grade of the cutting tool should be equal to that of the gear to be machined.
(3) The tool rotation direction should be the same as that of the machined gear as far as possible. When hobbing spur gears, the left-hand gear cutter is generally used.
7 automatic line and NC machine tool
Generally speaking, the cutting part of this kind of cutting tool is not much different from the general cutting tool, but in order to adapt to the characteristics of CNC machine tools and automatic line machining, it puts forward higher requirements for them.
CNC tool has formed three systems: turning tool system, drilling tool system and boring and milling tool system.