2014年6月18日星期三

The Joy of Slides


  Don't get too excited. While this article might not be talking about the slides we all enjoyed as children. It does shed some light onto one of the small components we probably encounter every day that have made a long lasting impact on products all around the world.
  Linear slide bearings are all around you and you may not even know it. Linear slides are often screw driven and ball guided devices designed for an extremely wide range of applications that call for high thrust capacity, stiffness, and precision. While they might not be the exhilarating pieces of plastic you came to know and love,slide bearing you use them every day and it's very possible that your life would be much different without them.
  Available in a wide variety of types and configurations, linear slides are typically ball slide bearings, roller bearings, or plain bearings. For the purposes of this article, we will discuss the most popular variety of linear bearing: the ball slide bearing.
  Ball slides are one of the most widely adopted varieties of linear slidesslide bearing. Referred to this way because the rolling element of the assembly is contingent on the ball bearing, ball bearing slides provide smooth, reliably, and price motion on a single axis with a linear design. Adding to this, the self-lubricating properties of the bearing work to add to the design's inherent reliability.
  Applications for linear ball slides are extremely varied, ranging from cabinetry and furniture to high-end instrumentation and aerospace equipment. That's right. From your kitchen to the mars rover - bearings make motion possible just about everywherePlastic bearing. Other applications often include factory automation, medical devices, packaging applications, semiconductor manufacturing, machine tools, printing equipment, automotive assembly, food processing, and many others. For a simple and extremely common example of a slide bearing in your every-day life, you only need to look as far as your desk drawersPlastic bearing. Chances are they are attached to simple linear bearings.
  Ball slide bearings are typically constructed from materials like aluminum, galvanized steel, and cold rolled steel. Most often, ball bearing slides are comprised of two linear rows of ball bearings that are retained by rods and aligned on opposite sides of the base, acting as a support the carriage - this helps promote smooth movement through the bearings.
  With all of the possible configurations available, ball slide bearings are extremely versatile, making them suitable for a number of applications in various operating conditions. Additionally, their applications range from very simple hand powered movement to being powered by a drive mechanism in robotic and assembly applications.
  While linear ball slide bearings are used widely around the world, their load strength does tend to be lower than some other bearings. This is due to the fact that the ball bearings are less resistant to wear and tear. They also require a housing or a drive system, though this hasn't prevented their widespread usage in certain applications and industries.

sintered metal-Plastic Sintering and Its Advantages


There are many apowder metaldvantages to producing plastics via a method known as sintering。 The main way in which this method is different to other plastic production methods is that the raw material is taken in its powdered form。 This provides many advantages as it enables the manufacturer to begin with raw materials of very high purity and, as this process contains fewer steps than a lot of plastic production techniques, it allows the resin to remain purer throughout the entire process。

Sintering also does not require the plastic powder to reach it´s melting point in order for the particles to fuse and become one solid object, therefore this is a favoured method of production when handling materials with particularly high melting points, for example molybdenum and tungsten。 This process can also enhance the plastics strength, heat and electrical conductivity, and can be used to manipulate the plastics surface texture i。e。 it can either create incredibly smooth surfaces or porous surfaces depending on the desired product。 This can easily be determined by controlling the amount of fluid and gas that comes into contact with the resin during the sintering process。 For example a porous surface area will suit a product that needs a paint or wax finish as this will allow the paint or wax to adhere to the plastic more strongly。

Sintering technologies can be applied to many different raw materials and is also used in the production of ceramics and metals。 These can also be added to the plastic powder during the very early stages of production in order to create a stronger material。

Sintering occurs when the powdered form of resin and any additives or colorants are thoroughly mixed together and placed in an appropriate mould。 This mixture is then heated (it is not necessary to heat fully tosintered metal reach the resins melting point) and the powdered particles begin to adhere to each other。 This occurs via a process known as atomic diffusion which occurs in all materials but is speeded up by the presence of heat。 As these powdered particles begin to reach a high enough temperature they begin to fuse their boundaries together to form one solidified object。 Once the resin has filled all corners of the mould and has fused together it is left to cool slowly until it is cool enough for the finishing touches to be made, this could be painting or waxing or adding additional plastic parts to complete the product。