mim products,key lock cylinder

mim products,key lock cylinder
Processing:MIM
Material:iron-nickle alloy
Certificate:ISO9001:2008
As a metal forming process, Metal Injection Molding (MIM) combines the material flexibility of powder metallurgy and the design flexibility of plastic molding. With properties comparable, or better than, those of wrought steel, the MIM process is ideally suited to producing small and complex-shaped parts with outstanding mechanical properties.
In addition to cost-effective, high-volume production, other MIM benefits include:
Complex geometries
Close porosity
Excellent surface finish
High performance
High final density (93-99%)
MIM components combine the outstanding material properties of metal and the complex design options of plastic technology. Shaping by the injection molding of metal powders
(MIM) offers maximum freedom with respect to part geometry and material options far exceeding the design possibilities of machining and casting technologies. Undercuts, bores and blind holes can be formed in any direction. Wall thickness of 1 mm or less as well as bore diameters of just a few tenths of a millimetre can be realized.
Relief-like structures and engravings such as company logos or identification marks can be produced in detail. Even the use of expensive high strength alloys, corrosion resistant and other premium steels is possible as no additional machining costs are incurred.
MIM components achieve an excellent surface finish (usually surface roughness values Ra < 1NM) without any subsequent operations. The microstructure of the sintered components allows electroplating and electro-polishing without any pretreatment. The depth of penetration after case hardening is comparable to the values of forged steels. MIM materials are usually weldable too.

MIM
– A Highly Technical Manufacturing Process
1.) Feedstock preparation
For the preparation of the feedstock, metal powders are first blended according to the desired alloy composition. Then thermoplastic polymers and additives are kneaded with the powder mix and heated to obtain a viscous mass. The mass is then cooled down and processed into granular pellets (feedstock). The metal powder alloy determines the mechanical and chemical
properties achieved by the finished product. Hengrui engineers have excellent know-how for powder development as well as for controlling the feedstock properties achieved.
2.) Injection molding
Thermoplastics injection molding machines with special modifications are used in MIM technology, similar process as applied in conventional plastics injection molding. After being dosed and fed into the injection unit the input material (feedstock) is molten and densified in front of the screw conveyor. By a forward movement of the screw the plasticized mass is injected with high pressure through a sprue and runner system into the individual cavities of the mold. Subsequently the mass is 'frozen' inside the mold cavities with their geometric design ('green compact'). After cooling down to the ejection temperature the mold is opened along the parting plane. The solidified parts, i. e the green compacts, are ejected from their cavities by means of ejection pins and can then be removed by suitable handling systems.
MIM
– Metal Injection Molding
Green compacts are characterised by: portions of approximately 10% binder and 90% metal powder strength similar to thermoplastic polymer parts homogeneous powder distribution without particle alignment
3.) Debinding and sintering
Subsequent debinding serves to remove the polymer binder from the green compacts. This first step is carried out in continuous sintering equipment. A catalyst is fed into the debinding muffle which is evaporated at temperature, thereby forming a reactive atmosphere by which the polymer is completely de-polymerised. The binder is continuously degraded during the reaction and escapes in a gaseous form from the compact. The resulting structure has an open porosity. This porous structure is known as the 'brown part'. The brown parts are directly transferred into the sintering muffle. Here the temperatures are increased almost to the melting point in a well-controlled process until the metal particles sinter. The furnace atmospheres applied may be inertor reducing. Processing conditions in the computer controlled equipment are precisely monitored. Only due to this effort is it possible to keep the 16 to 18 percent shrinkage of the parts under control in order to attain the final dimensions as specified by the customer
Heat treatment Hardening, tempering, quenching and tempering, surface hardening, case hardening
Physicochemical surface treatment Nitriding, carbonitriding, nitrocarburizing,boriding, siliciding
Chemical surface treatment Pickling, chemical deburring, burnishing, etching
Mechanical surface treatment Engraving, barrel fi nishing, grinding, polishing, deburring, shot peening
Applying nonmetallic anorganic coatingsChromatising, phosphating, anodizing, enamelling
Applying metallic coatings Electroplating, chemical metal coating, melt dip coating, metal spraying, chromizing
Applying organic coatings Printing, adhesive bonding, varnishing
Applying wear resistant coating CVD coating, PVD coating




Metal Injection Molding Applications
Automotive Systems
Steering Columns (actuators, ignition lock components), Sun Roofs (stop cams), Seating Mechanisms, Solenoids, Fuel Injectors
Orthodontics
Brackets, Buccal Tubes
Medical and Dental Instruments
Endoscopic Surgical Instruments
Firearm Components
Triggers, Sights, Safeties, Seer Blocks
Ordnance
Guidance Fins
Hardware and Lock Parts
Lock Cylinders, Bolts, and Sidebars
Computers and Electronics
Disk Drive Components
Electrical
Connectors, Switches