Magnet Production Flow and Magnet Quality Control – To allow our customers to use our high-quality products with peace of mind, HANGSENG Magnets provided inspection reports.

Production Flow and Quality Control

Production Flow and Quality Control

The main items of inspection data in the inspection reports are as follows:
Main items in the inspection report

Equipment name An outline of the product material, product shape and product dimensions based on customer specifications is reflected in the equipment name. For details, see the page on the designation of equipment names.
[ Example ]
NF-35SH- Represents the material.
W10X30X12- Gives an outline of product shape and dimensions.
Drawing number Indicates the drawing number in the client’s specifications.
Lot No. Represents the manufacturing lot number of the product to be delivered. This number is used for lot control with traceability so that the history of a product?s entire manufacturing process can be traced.
Magnetized or not, marked or not Before delivering the product to the customer, we may give magnetism to (magnetize) the magnet. To confirm it and clarify the direction of magnetization, this confirmation item results in the product being marked.
Magnetic characteristics To indicate the basic material performance of the magnet to be delivered, we indicate values for the various magnetic characteristics measured with a B-H meter. A demagnetization curve (B-H) curve is also attached.– Br (residual flux density)
Indicates the intensity of a magnet?s magnetism.

– Hcb (magnetic coercive force)
The magnetic field intensity at which the sum of a magnet?s reverse magnetism (when placed in a magnetic field) and the magnetic field applied becomes zero.

– Hcj (essential magnetic coercive force)
The magnetic field intensity at which the magnetization intensity of the magnet itself becomes zero.

– (BH) max (maximum energy product)
Indicates the maximum BxH product in the demagnetization curve and represents the maximum magnetic energy possessed by the magnet.

Surface treatment This refers to a processing operation for rustproofing to be conducted mainly on the surfaces of an Nd-Fe-B product (neodymium magnet). Its standard means nickel plating.
Packing specifications In addition to our standard packing specifications, a special method of packing may be adopted as agreed upon with the customer. The basic specifications are indicated here.
Product inspection results Indicates the measurement data mainly for product sampling inspections. Indicates inspection results for dimensions, surface flux density, appearance, neodymium magnet reliability test (PCT acceleration test), and other inspections.(1) Dimensional inspection
Indicates inspection items, inspection method (measuring equipment), specified standard values, measurements taken, and pass-fail decisions.

(2) Surface flux inspection
Indicates the specified standard values as determined by a Gauss meter, measurements taken, and pass-fail decisions.

(3) Appearance inspection
Indicates pass-fail decisions based on our standard specifications or customer specifications.

(4) Pressure cooker test (PCT) inspection
Indicates pass-fail decisions according to our standard specifications or customer specifications.