Disc Spring Washer | Belleville Washer [Gear Used]

The mid-nineteenth century saw the conception of a conical shaped spring disc. This spring disc was subsequently termed a belleville washer after the name of its originator
Belleville WashersHeavy Duty Belleville Washers to DIN 6796

Phosphating : A zinc phosphate coating usually with subsequent oil or wax treatment. This treatment is widely offered as 'standard' on most stock-range carbon steel disc springs. The protection offered is sufficient to prevent corrosion throughout storage and normal transit conditions. It is adequate also for those applications where the disc springs are not directly exposed to the elements. However, where the application involves a more hostile environment, i.e. disc springs open to weather or marine conditions, chemical or acid laden atmosphere, etc; then a superior treatment or material must be considered.
Mechanical Zinc Plating : This is a method of depositing substantial thicknesses of zinc on the surfaces of disc springs without the risk of 'hydrogen embrittlement' associated with normal electro-plating. The zinc is impacted onto the surfaces by way of tumbling the disc springs in a rotating barrel, together with glass beads, metal powder, and promoting chemicals. In addition to removing the risk of embrittlement, the 'peening' aspect of this process is beneficial in terms of some stress relieving of the components. There are two forms of subsequent passivation treatment

TECHNICAL REQUIREMENTS:
Disc springs with bearing surfaces shall conform to group 3 din 2093
Disc spring stack consists of no of disc springs assembled in single series
Individual disc spring is to be tested with spring force P0.75 at disc height L0.75 and combined testing of the spring stack is to be done as per Spring diagram.
The test shall be done with the help of two pressure plates provided on both the sides which shall be harden ground and polished, using suitable lubricant.
Values encircled as shall be measured and recorded by supplier on test certificate values of and are for reference only.MANUFACTURING METHODS.5.1 Disc are to be manufactured by hot forming5.2 Disc are to be machined all over and sharp edges to be rounded off5.3 Concentricity of diameter should be within 0.5mm
HARDNESS SURFACE AND SCRAGGING.6.1 The decarburization of disc springs after heat treatment should not exceed 3% of disc thickness6.2 Hardness of each disc should be within 42 to52 HRC6.3 After heat treatment disc spring must be subjected to scragging, to ensure that after being loaded at twice the force P0.75 the free height of disc does not vary6.4 The surface must be free from defects viz crack, pits, rust, spots, etc.
Anti corrosive coating on disc springs can be Phosphatising, ZN OR CD plating as per suppliers choice.
Material test certificate should include chemical properties and hardness of disc springs.
Identification of springs as per HW 040397 at a places marked with the in identification marking should not dissolve in turbine oil and fire- resistant fluid (phosphate esters).
In addition each disc spring shall be marked with stack no and disc No. Disc No.2 of stack no 1 shall be marked as I/?.
Disc springs shall be property tied together and packed to avoid intermixing and damage during Transit and storing.