The importance and advantages of the enhanced process have been well known and recognized. Whether it is for the automotive industry's leaf springs, round springs, transmission components or landing gear or engine parts in the aerospace industry, the cleaning process cannot be equated or replaced by a strengthening process. “Clean up is to strengthen, clean up can be strengthened.†This is absolutely wrong. There is a classic saying in Wheelabrator (Group) that is widely spread, that is, "cleaning is art, and strengthening is science."
Although there are several ways to measure the quality of the cleaning, the most common is to rely on visual inspection to measure the cleaning results, ie the parts are cleaned or not cleaned. The degree of cleanliness varies from person to person. At present, there are some unified visual proofreading samples and standards in the world, especially for plate, steel and steel components, which provide some reference photos of surface rust and cleaning standards, and compare them to confirm whether Meet the cleaning requirements. A special roughness gauge can also be used if surface roughness is required. Even so, the cleaning process relies mainly on human visual inspection, with a low degree of quantification, while reinforcement requires high controllability, high repetition and data, which is more well-documented and well defined.
Use reinforcement to achieve specific Almen strength, saturation and 100% or higher coverage. This strength of reinforcement is the value of the compressive stress that the part design engineer wants. In addition, some key parameters, including the size of the pellet media such as steel pellets, shredded pellets, and glass pellets, are also specified by the part design engineer.
The term "enhancement" is no longer unfamiliar, but the understanding of its concept is not clear or vague for some people involved in the field. Some misunderstandings, such as "cleaning equipment can also be used for reinforcement", mainly from the following Factors:
1. The lack of educational resources and information to strengthen the process
2. Lack of capital investment, suitable strengthening equipment
3. There is already cleaning equipment and only the habit of cleaning up
4. Some cleaning equipment manufacturers are misled by customers because they do not have the ability to design enhanced equipment.
In recent years, in countries where industries have emerged, such as India and China, the understanding of reinforcement has gradually turned to the right direction. Many of the world's leading industrial giants have set up manufacturing plants in these countries, and have brought it to the best technology and process in the home country. Strengthening is one of the key processes, and it is also subject to rigorous and scientific application and verification. . Whether it is a sole proprietorship or a joint venture, these top industrial companies standardize and strengthen the process, define the process requirements clearly and set standards, as the “Bibleâ€, require its subsidiaries or third parties to strictly abide by and ensure the production in these countries. The product remains of the same quality as the home country factory. In addition, if developing countries want to export parts and components to mature markets in Europe and America, they must add the process of “correctly strengthening†in their production processes, and must strictly comply with and comply with the enhanced specifications.
Intensification was originally carried out by using a compressed air nozzle to inject steel shots into the parts that need to be strengthened. In order to meet the ever-expanding demand of customers' production requirements, Wheelabrator (Group) has also developed equipment for shot peening using centrifugal force throwing heads.
Shot peening using compressed air is preferred when the part has a specific target area/site that needs to be strengthened, or when the pellets used in the design are ceramic beads or glass beads. At the same time, the nozzle robot can achieve a high degree of automation.
If there is a production time limit, or in a high-capacity, mass-produced manufacturing environment, such as the automotive parts manufacturing industry for strengthening leaf springs or round springs, centrifugal force shot peening is ideal. Depending on the application, the strength value on the 'A' type test piece can be in the range of 0.010" to 0.015", and the coverage rate is required to be 100% to 200%.
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