VAC AERO uses the Honeywell HC900 Hybrid controller to regulate machine functions and thermal cycles. The HC900 is integrated with Honeywell Experion Vista software to provide Supervisory Control and Data Acquisition (SCADA) using a large color touch screen LCD for operator interface. VAC AERO’s programmable, logic based control system is comprised of proven hardware components, suitably hardened for an "industrial shop" environment and optimized to cover all normal operating and alarm conditions. Process information is accessible by operators and across a company’s network for process engineers, allowing control and monitoring for higher productivity, reduced costs and increased quality.
The history of vacuum technology is a fascinating one. It seems to have begun in ancient Greece when the philosopher Democritus (circa 460 to 375 B.C.) proposed that the world was made up of tiny particles that he called atoms (atomos, Greek: undividable). Democritus proposed that empty space (in other words, in modern terminology, a vacuum) existed between the atoms, which moved according to the general laws of mechanics. Democritus, together with his teacher Leucippus, may be considered as the inventors of the concept of a vacuum. Our modern view of physics is heavily influenced by the ideas of Democritus.
Although liquid-penetrant inspection, such as dye penetrant inspection (DPI) and fluorescent penetrant inspection (FPI), are useful tools for inspecting fusion-welds, they should NOT be used for inspecting brazed joints. This is especially true for any parts on which subsequent braze-repair may be required, such as many aerospace components that are vacuum-brazed, then placed in service for long periods of time, and then come back for later repair or rebuilding and then sent back out for more field-service.
There are virtually no cases of naturally occurring color in meteoritic microstructures. Color can be introduced using DIC but it has no physical significance or value. Polarized light may produce some color effects with graphite and certain mineral phases but these are not commonly observed. Crossed polarized light, in some instances, can produce color effects in coarse martensite within taenite wedges, as shown in Figure 1. This is a high magnification micrograph of coarse martensite in Odessa using nearly crossed polarized light and a sensitive tint plate (which has colored the residual taenite magenta).
Last time the discussion was about throughput and conductance in vacuum systems. This time we will look at the pressure profile throughout the vacuum system in a slightly different way than it was shown last time. The first thought might be that once the vacuum system is under vacuum carrying out the process, the lowest pressure will be in the vacuum chamber and that the highest pressure will be at the primary pump exhaust which will be atmospheric pressure. As we see from Fig. 1, this is not quite correct.
The effect of cryogenic treatment (CT) on the properties of ledeburitic tool steels was investigated. CT is also used in conventional heat treatment to improve mechanical properties and wear resistance and decrease the amount of retained austenite. The technology of CT was developed in the 1960s and still elicits contrary scientific opinions today. Some studies report that CT improves hardness, wear resistance, bending strength, toughness, fatigue strength, etc., but some scientists do not agree. Also, experts do not agree as to the main factor influencing results when CT is applied – austenitizing temperature, cooling rate, quench temperature, holding time, heating rate or tempering temperature.
There are many processes that can benefit from the ability to precisely vector a jet, or plume, and control the jet geometry. These include coating processes, such as flame spray and plasma spray, in which it is vitally important that the coating thickness be uniform, even in regions where it is difficult to maintain a constant standoff distance and optimal angle of incidence. In addition, the contents of the jet, or effluent, can be combusting or can contain a plasma, thus making the environment in which the jet operates very hostile from both a chemical and temperature perspective. The nozzles of modern thermal spray devices are designed for the desired process and are generally not directional.
VAC AERO offers a wide range of vacuum heat treating and brazing furnaces, from small laboratory models to large vertical furnaces, as well as equipment for CUSTOM applications. VAC AERO offers complete turnkey services, including planning, designing, building and installation of vacuum furnace systems and controls. VAC AERO’s experience, proven through decades of service in commercial heat treating, has provided us with valuable insight into the changing needs and rigorous demands of our furnace customers. As a result, VAC AERO has developed a keen understanding of the design and performance of vacuum furnace systems built to meet the most stringent requirements for reliability. VAC AERO’s vacuum furnace design innovations are thoroughly tested in our own heat treating facilities before being offered to our customers. That means better quality, reliability and efficiency to maximize uptime and productivity. Horizontal vacuum models provide great flexibility for general heat treating and brazing applications and Vertical bottom-loading models are ideal for processing large circular parts such as rings, stators or engine casings and long parts like shafts or rolls.