The creation and development of vacuum furnace plays a very important role in human progress. In the Shang Dynasty, a relatively perfect copper smelting furnace appeared in China. The furnace temperature reached 1200 ℃, and the inner diameter of the furnace reached 0.8m. In the spring and Autumn period and the Warring States period, people further mastered the technology of raising furnace temperature on the basis of copper melting furnace, and thus produced cast iron.
In order to heat large workpieces, the trolley type furnace suitable for heating ingots and billets and the well type furnace for heating long rods have also appeared. Since the 1920s, various mechanized and automatic furnace types have appeared, which can improve furnace productivity and working conditions. With the development of fuel resources and the progress of fuel conversion technology, the fuel of industrial furnace is gradually changed from solid fuels such as lump coal, coke and pulverized coal to gas and liquid fuels such as producer gas, city gas, natural gas, diesel oil and fuel oil, and various combustion devices suitable for the fuel used are developed.
The structure, heating process, temperature control and atmosphere of vacuum furnace will directly affect the quality of processed products. In the forging furnace, increasing the heating temperature of the metal can reduce the deformation resistance, but too high temperature will cause grain growth, oxidation or overburning, which will seriously affect the quality of the workpiece. In the process of heat treatment, if the steel is heated to a certain point above the critical temperature and then cooled suddenly, the hardness and strength of the steel can be improved; if the steel is heated to a certain point below the critical temperature and cooled slowly, the hardness of the steel can be reduced and the toughness can be improved.
Hi there,
Hoping for a little bit of help with my RCD330 plus. I just purchased what I belive to be a 187B noname from eBay. I have a couple problems, I feel the head unit has a bit of a mind of its own. It first off all doesn’t turn on with the ignition, needs to be manually turned on and then the Bluetooth says that the ignition needs to be on for it to be activated which it already is, it says this for 3-5 minutes before it eventually turns the Bluetooth on. It also decides when it wants to turn off with the ignition, usually when the Bluetooth is activated it will turn off with the ignition but if the Bluetooth hasn’t activated yet it won’t turn off with the ignition. Also the lights powering the buttons such as “media” tend to stay on when my car is turned off.
I have a 2013 (63 plate) Volkswagen polo which originally had an RCD310
I have attached a video of my problems.
Any help would be greatly appreciated.
Thanks a lot
The vacuum furnace eliminates the oxidation and decarburization of the workpiece surface in the heating process, and can obtain a clean surface without deterioration layer. The heating chamber of the vacuum furnace is made of high-quality heat insulation materials with heat insulation walls and barriers, which can highly concentrate the electric heating energy in the heating chamber, with remarkable energy-saving effect. The following is a professional analysis of the functions of the vacuum furnace:
Vacuum quenching (tempering, annealing) is a treatment method to achieve the expected performance by heating and cooling the material or parts in vacuum according to the process specification.
Vacuum brazing is a welding process in which a group of weldments are heated to a temperature above the melting point of the filler metal but below the melting point of the base metal in vacuum, and a weld is formed by the wetting and flowing of the filler metal to the base metal (the brazing temperature varies with different materials).
Vacuum sintering is a method of heating metal powder products in vacuum to make adjacent metal powder grains form parts by adhesion and diffusion. Vacuum magnetization is mainly used for magnetization of metal materials.
After installing my RCD330 in a VW transporter 5.1 with an external 4 channel amplifier trough a hi low converter. Now I need to bring the output down to line level with VCDS. This is where the trouble starts.
After coding the Hu to “Skoda soundsystem” it accepts the coding and the sound noticeably changes to line level. Then to save the coding I have to hold the volume button for some time so the hu reboots. After this step there is no more sound from the radio or e.g. spotify . Only sound that is being send from the radio now is the touchscreen beep sound and when using apps like maps you can hear the voice really loud trough the rear left speaker, apart form that no sound. To fix this you have to revert coding to “no sound system”. After reboot there is sound again, but this way the hu sends an amplified sound to my amplifier. The radio only works on skoda sound system directly after coding it so, when you reset or reboot it, the sound is pretty much gone. Hope someone can help me out, cause i would like to keep the rcd 330 but it really needs to work with my amp properly!
Hi im new to this so sorry if theres already a thread on it, does anyone know if any variations would fit my audi a3 8p? I can try upload pictures if anyone needs to see anything. Thanks!
. Only sound that is being send from the radio now is the touchscreen beep sound and when using apps like maps you can hear the voice really loud trough the rear left speaker, apart form that no sound. To fix this you have to revert coding to “no sound system”. After reboot there is sound again, but this way the hu sends an amplified sound to my amplifier. The radio only works on skoda sound system directly after coding it so, when you reset or reboot it, the sound is pretty much gone. Hope someone can help me out, cause i would like to keep the rcd 330 but it really needs to work with my amp properly! 