Scientific and technological innovation and research and development help measurement development

[ Instrument network instrument research and development ] The Institute of Chemical Metrology of Henan Academy of Metrology has recently successfully developed the "dissolved oxygen meter verification device".
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The size of dissolved oxygen can reflect the pollution of the water body, especially the degree of organic pollution, which is an important indicator to measure water quality. Dissolved oxygen analyzers can be used to determine the concentration of dissolved oxygen in water, and are widely used in food processing, biopharmaceutical and environmental monitoring industries.
The state has issued and implemented JJG 291-2018 "Verification Regulations for Dissolved Oxygen Analyzers", which clarifies the verification items and methods of dissolved oxygen analyzers. However, currently there is no mature integrated automatic verification device on the market, and the verification personnel still need manual operation. The low verification efficiency also inevitably introduces human errors.
As part of the Henan Provincial Science and Technology Project "Water Quality Testing Instrument Traceability System and Key Technologies", the Institute of Chemistry of our institute has developed a set of dissolved oxygen analyzer verification device (authorized patent number 2019220525871) with completely independent intellectual property rights. The device is realized It has functions such as automatic detection and control of the temperature in the working area, automatic collection of ambient air pressure, automatic calculation and correction of dissolved oxygen standard values. The device has a high degree of automation, and all technical indicators are better than the requirements of the verification regulations. It can be used in measurement technology institutions at all levels to verify and calibrate the dissolved oxygen meter. It can also be used in the production and use units of the dissolved oxygen meter to perform the instrument Performance testing and quality control have good promotion and application value.

Sheet Metal Forming


Sheet metal forming processes are those in which force is applied to a piece of sheet metal to modify its geometry rather than remove any material. The applied force stresses the metal beyond its yield strength, causing the material to plastically deform, but not to fail. By doing so, the sheet can be bent or stretched into a variety of complex shapes. Sheet metal forming processes include the following:

l Bending

l Roll forming

l Deep Drawing

l Stretch forming

Bending

Bending is a metal forming process in which a force is applied to a piece of sheet metal, causing it to bend at an angle and form the desired shape. A bending operation causes deformation along one axis, but a sequence of several different operations can be performed to create a complex part. Bent parts can be quite small, such as a bracket, such as a large enclosure or chassis.

V bending and Wipe bending

Roll forming

Roll forming, is a metal forming process in which sheet metal is progressively shaped through a series of bending operations. The process is performed on a roll forming line. Each station has a roller, referred to as a roller die, positioned on both sides of the sheet. The shape and size of the roller die may be unique to that station, or several identical roller dies may be used in different positions. The roller dies may be above and below the sheet, along the sides, at an angle, etc. the roller dies are lubricated to reduce friction between the die and the sheet, thus reducing the tool wear. Also, lubricant can allow for a higher production rate, which will also depend on the material thickness, number of roll stations, and radius of each bend. The roll forming line can also include other Sheet Metal Fabrication operations before or after the roll forming, such as punching or shearing.

Deep drawing

Deep drawing is a metal forming process in which sheet metal is stretched into the desired part shape. A tool pushes downward on the sheet metal, forcing it into a die cavity in the shape of the desired part. The tensile forces applied to the sheet cause it to plastically deform into a cup-shaped part. Deep drawn parts are characterized by a depth equal to more than half of the diameter of the part. These parts can have a variety of cross sections with straight, tapered, or even curved walls, but cylindrical or rectangular parts are most common. Deep drawing is most effective with ductile metals, such as aluminum, brass, copper, and mild steel. Examples of parts formed with deep drawing include automotive bodies and fuel tanks, cans, cups, kitchen sinks, and pots and pans

Stretch Forming

Stretch forming is a metal forming process in which a piece of sheet metal is stretched and bent simultaneously over a die in order to form large contoured parts. Stretch forming is performed on a stretch press, in which a piece of sheet metal is securely gripped along its edges by gripping jaws. The gripping jaws are each attached to a carriage that is pulled by pneumatic or hydraulic force to stretch the sheet. The tooling used in this process is a stretch form block, called a form die, which is a solid contoured piece against which the sheet metal will be pressed. The most common stretch presses are oriented vertically, in which the form die rests on a press table that can be raised into the sheet by a hydraulic ram. As the form die is driven into the sheet, which is gripped tightly at its edges, the tensile forces increase and the sheet plastically deforms into a new shape. Horizontal stretch presses mount the form die sideways on a stationary press table, while the gripping jaws pull the sheet horizontally around the form die

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