Ningbo Tongchuang Strong Magnet Material Co., Ltd.

Super Magnets

Permanent Magnets

	Industrial Magnets
	Motor Magnets
	Pick-up Magnets
	Speaker Magnets
	Wind Turbine

Magnetic Material

	NdFeB Magnets/Neodymium Magnets
	Ferrite magnets
	SmCo Magnets
	AlNICo Magnets
	Rubber Magnets/Flexible magnets

Magnetic Assemblies

	Magnetic Chucks
	Permanent Magnets Lifters
	Magnetic badges
	Magnetic Jewelries
	Magnetic Tools

Magnets Specification

	Magnetic Propertities of Sintered NdFeb Magnets
	Magnetism direction
	Coating or plating
	T And L Series Magnets
	Magnets Inspection

Production procedure and workshop

HOME >> Production procedure and workshop

Raw materials: Our Raw materials select Nd,DyFe,.B-Fe and other rare earth materials etc. Its Chemical Compound is Nd2Fe14B1 in theory .Please refer to the picture of our raw material alloy below.
	raw materials alloy

Strip casting: Our factory have two different technology to Produce Sintered NdFeB Magnets.one is Casting Alloy tech.The other is strip castingwhich is Foundation of HDDR.Make the Raw materials Alloy turn into strip of NdFeB alloy in Physical method. Please check the pictures of Our casting strip and casting alloy below.
	melting

Hydrogen Decrepitation: HDDR:the Strip casting and HDDR progress is an advance and new techonology to manufacture sintered NdFeb magnets.This technology is used to produce high grade and quality sintered NdFeB.

strip casting	hydrogen decrepitation	casting strip

Jet Milling: Make sure of special Quipment,utilize high speed air flow to make micro partical to manufacture NdFeB Magnetic Powder , Picture of Magnetic Powde in storage room is below and for your reference.

jet milling	magnetic powder storage

Pressing: This is Necessary progress to manufacture magnets of NdFeB .Make NdFeB into Block or Cylinder Shape or Arc /Segment shape .Utilize Special Pressing Equipment pressing NdFeB Magnetic Powder in Physical Method.Later do Isostatic pressing to make the density of magnets More solid and tight ,this is preparing for Next Sintering Procedure.Please refer to our Pressing Semi-Products picture below.

pressing	isostatic pressure	pressing semi products

Sintering: Utilize Vacuum Sintered Furnace to make the Pressing Semi Products to be more tight and Close-Knit .and to avoid the magnets too loose .After Sintering,the density of magnets blocks and cylinder and arc will be much better to machine during the future Procedure.. Sintering Magnetic Properties are developed by an aging heat treatment which may be in the presence of a magnetic field.Following picture is some of Sintered NdFeB Semi-Products ,which just took out from Sintering Furnace.

sintering	semi sintered products	semi sintered magnets

Inspection: Important and main Measurements including Remanence Br,Coercivity and maximum energy products are recorder.Only those magnets which passed the testing can be sent to next procedure .Please visit our Propertities of Sintered NdFeB Magnets below: Magnetic properties of sintered ndfeb magnets
	magnetic property inspection (Demag Curve)

Machining:Including Slicing,wire cutting,drilling holes,Grinding,Centerless grinding etc. To make the big block or cylinder sintered semi-magnets to be the size and shape which customer request and Order
	machining

Plating and Coating: As un-coated NdFeB magnets are sensitive to outer air and temperature,so if expose the un-coated NdFeB magnets in the air for some time,the Surface of magnets will turn to be rusted easily and quickly.That is the reason why we need to coat the magnets with Diffferent plating ,such as Nickel,Cr3+Zn.Black Epoxy etc.
For more informations,please visit the coating of NdFeB magnets below: Magnets coating plating

Final Inspection: The final inspection including the dimension and size ,and shape of magnets ,.and the center guass,maximum gauss,and the coating of layer,other Weight Loss test etc.For more information ,please visit our magnets inspection standard : magnets inspection

auto inspecting machine	digital fluxmeter	coating thickness measurer


electrothermal aging test box	PCT tester	HAST tester


projector	salt spray tester	surface gauss tester

Magnetizing and packing: After Final inspection ,the qualitied and good magnets are sent to magnetizing and packing procedure.We have three packing methods,one kind of packing is for Air Delivery ,packed with iron sheet and Thick foams to shield the magnetism coming out ;another is for Sea shipping delivery, Packed with Thick foams to shield the magnetism coming out.and last kind is packed as Customer request such as Tube packing ,PVC Packing etc.

packing department	packing

Ningbo Tongchuang Strong Magnet Material Co., Ltd
Add: NO.318.Kexin Road, Wang Chun Industrial Area, Yinzhou, Ningbo, Zhejiang, China
TEL: 86-574- 88170908, 88089786
Fax: 86-574- 88170906, 88089789
E-mail: sales@ndmagnets.com (General Inquiry)