CN105336490B - A kind of processing method of Nd-Fe-B permanent magnet - Google Patents

A kind of processing method of Nd-Fe-B permanent magnet Download PDF

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Publication number
CN105336490B
CN105336490B CN201510838098.2A CN201510838098A CN105336490B CN 105336490 B CN105336490 B CN 105336490B CN 201510838098 A CN201510838098 A CN 201510838098A CN 105336490 B CN105336490 B CN 105336490B
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block
magnet piece
processing
thick
finished
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CN201510838098.2A
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CN105336490A (en
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陈亮
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东莞金坤新材料股份有限公司
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    • H—ELECTRICITY
    • H01—BASIC ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/026—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets protecting methods against environmental influences, e.g. oxygen, by surface treatment
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc
    • H—ELECTRICITY
    • H01—BASIC ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B

Abstract

The present invention relates to permanent magnet technical field, and in particular to a kind of processing method of Nd-Fe-B permanent magnet, comprises the following steps：A, stock up；B, stack, the raw material got ready in step A is stacked and is bonded on asbestos board, obtains binding material block；C, cut, the end rim charge of binding material block for removing and being obtained in step B of first imposing uniformity without examining individual cases, then cut by product size requirement single solution for diverse problems to obtain one piece of semi-finished product material block and clout block；D, decoction made from powder, the semi-finished product material block that step C is obtained is placed in the water cooking liquid added with additive progress decoction made from powder processing, semi-finished product material block is scattered to obtain thick magnet piece by decoction made from powder；E, size Control and chamfered, the thick magnet piece that step D is obtained, which is placed in sander, carries out grinding process；F, electroplate and magnetize, the thick magnet piece obtained to step E carries out electroplating processes, and electroplating processes are completed to carry out processing of magnetizing to thick magnet piece again, obtain finished product magnet, and its preparation technology is simple, and production efficiency is high, and excellent anti-corrosion performance is lasting.

Description

A kind of processing method of Nd-Fe-B permanent magnet

Technical field

The present invention relates to permanent magnet technical field, and in particular to a kind of processing method of Nd-Fe-B permanent magnet.

Background technology

Magnetic synthetic material (product) is a kind of novel high polymer functional material to grow up for nearly 2 years, is modern section Learn one of important foundation material (product) of technical field.Magnetic synthetic material is divided into structural type and compound two kinds.Wherein, Compound magnetic synthetic material is divided into two major classes, thermoplasticity and thermosetting.Thermoplastic magnetic synthetic material can according to processing method It is divided into two classes, one kind is for base material, using the magnetic rubber of the processing technology shaping of rubber with haloflex or nitrile rubber etc. Glue；It is another kind of using nylon, polyphenylene sulfide as base material injection (extrusion) magnet.

Neodymium iron boron strong magnet is undoubtedly the outstanding person in magnetic synthetic material (product).Neodium magnet (Neodymiummagnet) ndfeb magnet is also referred to as, is the general designation of strong magnets, is a kind of artificial permanent magnet, for extremely There is the permanent magnet of most strong magnetic force so far.Because ndfeb magnet is with powder smelting by rare earth metal neodymium, pure iron and boron The technique of gold is prepared, and its surface is of a relatively loose porous, therefore poor chemical stability, and oxidation life easily occurs in use environment Rust, and serious electrochemical corrosion can occur under wet heat condition, magnetic property is degrading, greatly reduces its service life. Therefore it is just particularly important that strict surfacecti proteon processing is carried out to neodymium-iron-boron magnetic material.At present, solves neodymium-iron-boron magnetic material The main method of etching problem has the process of surface treatment such as plating, chemical plating, phosphatization and electrophoresis.Due to chemical plating, there is use The defects of cycle is short, expensive and substantial amounts of sewage disposal causes the deterioration of environment, and the Process anti-corrosion performance such as phosphatization, electrophoresis It is universal poor, therefore consider from adhesion, corrosion resistance, integrated cost and environmental pollution etc., generally use galvanizer Skill, wherein nickel plating and zincincation are particularly conventional.But one side neodymium-iron-boron shape is numerous and complicated, nickel plating and zinc-plated mistake CURRENT DISTRIBUTION is extremely uneven in journey, causes material surface nickel coating or zinc coating thickness to differ greatly；On the other hand common nickel Coating and zinc coating porosity itself are also at a relatively high, and nickel coating and zinc coating are to belong to cathodic plating for neodymium iron boron matrix Layer, the hole of nickel coating or zinc coating is only reduced as far as possible, could preferably protect parent metal.Therefore by improving nickel plating The thickness distribution uniformity and the porosity of reduction nickel coating and zinc coating of layer and zinc coating, have ten for neodymium iron boron antiseptic project Divide important meaning.

But the nickel coating of existing ndfeb magnet or zinc coating generally existing thickness distribution uniformity are bad, porosity It is higher, the defects of decay resistance is not lasting enough.

The content of the invention

In order to overcome shortcoming and defect present in prior art, it is an object of the invention to provide a kind of Nd-Fe-B permanent magnetic The processing method of iron, its preparation technology is simple, and production efficiency is high, and products obtained therefrom has by electrogalvanizing process and electronickelling process Zinc coating and nickel coating, excellent anti-corrosion performance are lasting.

The purpose of the present invention is achieved through the following technical solutions：A kind of processing method of Nd-Fe-B permanent magnet, including it is following Step：A, stock up, get block or cylindric raw material ready；B, stack, the raw material got ready in step A is stacked and is bonded in asbestos board On, obtain binding material block；C, cut, first impose uniformity without examining individual cases and remove the end rim charge of the binding material block obtained in step B, then by product chi It is very little to require that single solution for diverse problems cuts to obtain one piece of semi-finished product material block and clout block；D, decoction made from powder, the semi-finished product material block that step C is obtained is placed in and added There is in the water cooking liquid of additive a progress decoction made from powder processing, semi-finished product material block is scattered to obtain thick magnet piece by decoction made from powder；E, size Control with Chamfered, the thick magnet piece that step D is obtained, which is placed in sander, carries out grinding process, then thick magnet piece is done at chamfering Reason；F, electroplate and magnetize, the thick magnet piece obtained to step E carries out electroplating processes, and electroplating processes are completed again to enter thick magnet piece Capable processing of magnetizing, obtains finished product magnet, electroplating processes process includes electrogalvanizing process and electronickelling process successively.

The raw material of the present invention is stacked and is bonded on asbestos board, can once cut multiple products, cutting efficiency is high, effectively Ground improves production efficiency；The present invention is polished thick magnet piece by sander, so as to effectively control the size of product, products obtained therefrom Dimensional accuracy is high；Products obtained therefrom has zinc coating and nickel coating, zinc coating and nickel plating by electrogalvanizing process and electronickelling process Layer is used in combination, and the compact structure of protective layer, the porosity is low, and the excellent anti-corrosion performance of products obtained therefrom is lasting.

Preferably, the step C is cut using circular knife, is fixed using binding material block, the cutting mode of circular knife movement. Using such cutting mode, be advantageous to protect circular knife, mitigate the degree of wear of circular knife, extend circular knife uses the longevity Life, reduce production cost.

Preferably, it is 502 glue that raw material, which stacks used binding agent when bonding, in the step B.The bonding of 502 glue Property it is good, raw material stacks bond after be not susceptible to loosen, and 502 glue are easily decomposes, are easy to the progress of follow-up decoction made from powder process.

Preferably, the additive in the step D is NaCl and caustic soda with mass ratio 2:The mixture of 1-3 compositions, water temperature For 40-80 DEG C.NaCl is used cooperatively with caustic soda, decomposes the excellent performance of 502 glue, and decomposition rate is fast.

Preferably, the step D is further comprising the steps of：Decoction made from powder processing is carried out to the clout block in the step C, obtained Bulk cargo return in the step B, such circular treatment, the product that production standard size is not enough to until remaining bulk cargo is Only.Water cooking liquid is identical with used water cooking liquid during decoction made from powder semi-finished product material block used by the processing of this step decoction made from powder.The present invention one Knife is cut to obtain one piece of semi-finished product material block and clout block, and circular treatment in the step B is returned to after clout block decoction made from powder, rather than Monoblock binding material block is directly cut into the cutting mode of polylith semi-finished product material block using multitool, is advantageous to improve semi-finished product material block Cut surface quality.

Preferably, when the raw material in the step A is cylindric raw material, punch out step is also included in the step D, it is right Scattered obtained thick magnet piece carries out punching processing, and columned thick magnet piece gets through hole, gets through hole use and is first positioned with short sword, The hole knockout in hole is got through with rimmer knife again.It is easy to user to recognize the direction of magnetic pole when in use, avoids wrongly installed；It is columned thick Magnet piece gets through hole by the way of first positioning and punching again, and the dimensional accuracy of products obtained therefrom is high, effectively reduces through hole bias The possibility that situation occurs.

Preferably, the step D also includes hot blast air drying steps, and the thick air-dried place of magnet piece progress blowing hot-air is obtained to scattered Reason.The thick air-dried processing of magnet piece progress blowing hot-air is obtained to scattered, can effectively avoid the surface of thick magnet piece from being oxidized.

Preferably, in the step E product size precision controlling of grinding process in ± 0.02-0.03mm.Thick magnet piece After grinding process, dimensional accuracy is high, and quality is good.

Preferably, the plating solution that the electrogalvanizing process in the step F uses is formed as zinc sulfate 35-40g/L, boric acid 18- 22g/L, neopelex 40-50 g/L, potassium phosphate 110-150g/L, sal-ammoniac 26-30g/L, surplus are water, electricity It is 40-45 DEG C, electroplating time 41-45min, current density 10-15mA/cm to plate temperature2, pH 4.5-5.5, zinc coating Thickness is 6-10 μm.

The present invention uses zincincation, without using copper-plating technique, thus avoid brought by cyanide electroplating it is poisonous, dirty Contaminate the generation of high component so that plating technic Environmental Safety, and prepare the corrosion-resistant height of coating, appearance looks elegant, matrix and The adhesion of zinc coating is high；Chemical reaction generation ammonia can occur with other compounds for sal-ammoniac during the electrogalvanizing of the present invention Water, the ammoniacal liquor of generation are used as complexing agent in electroplating process, and it is used in combination with neopelex, and complex performance is excellent It is different so that the crystallization of zinc coating is more careful, significantly reduces the porosity of zinc coating, improves the corrosion resistance of zinc coating Energy；In the present invention as negative electrode thick magnet piece current density it is too high when, a large amount of hydrogen will be separated out on negative electrode, cause electric current to imitate Rate declines, the phenomenon that coating performance reduces, and when current density is relatively low, zinc coating deposition anomaly is will appear from, as preferred , the current density that above-mentioned electrogalvanizing process uses is 12 mA/cm2。

Preferably, the plating solution that the electronickelling process in the step F uses is formed as nickel sulfate 150-250 g/L, boric acid 30-40 g/L, n-octyl sodium sulphate 1-1.5 g/L, nano silicon 0.1-1 g/L, dipotassium hydrogen phosphate 30-40g/L, lemon Sour ammonium 70-120 g/L of hydrogen two, yttrium sulfate 1-2 g/L, triethanolamine 4-8 g/L, surplus are water, and electroplating temperature is 50-60 DEG C, Electroplating time is 41-45min, current density 8-12mA/cm2, pH 4.5-5.5, the thickness of nickel coating is 5-9 μm.

The plating solution that the electronickelling process of the present invention uses with the addition of n-octyl sodium sulphate, can effectively prevent coating from producing pin Hole, the addition of n-octyl sodium sulphate is excessive or the very few thickness evenness that all nickel coating surface can be made to grow dim, influence nickel coating, And then lower the decay resistance of magnet；Boric acid is used as buffer in this application, has the function that to stablize pH value, the amount of boric acid Burr and coarse can excessively be caused；In Ni-Speed, the addition of nano silicon, it can effectively suppress metallic nickel crystal edge Its dendrite arm direction is grown up, and constantly produces new nucleus, effectively increases nickel coating compactness, reduces the porosity of nickel coating, Improve the antiseptic power of magnet；Yttrium sulfate can act synergistically with nano silicon, and obtained nickel coating not only crystallizes carefully Cause, porosity is extremely low, while improves the dispersibility of plating nickel plating bath, improves the thickness of the nickel coating between different current densities Uniformity is spent, is effectively improved the corrosion resistance of nickel coating；Triethanolamine and the unstable constant that nickel is complexed are smaller, simultaneously Triethanolamine can form more stable complex ion with zinc ion and nickel ion, effectively enhance the compactness of nickel coating, The bright plating of nickel coating is improved, improves the corrosion resistance of nickel coating.

Preferably, thick magnet piece degreasing cleaning is also included before the electroplating processes process in the step F, is used Weak acid washes away the greasy dirt on thick magnet piece surface, then is cleaned thick magnet piece with clear water.Thick magnet piece table is removed using weak acid The greasy dirt in face, decontamination are thorough.

The beneficial effects of the present invention are：The preparation technology of the present invention is simple, and production efficiency is high, and products obtained therefrom is by plating Zinc process and electronickelling process have a zinc coating and nickel coating, and excellent anti-corrosion performance is lasting.

The present invention uses zincincation, without using copper-plating technique, thus avoid brought by cyanide electroplating it is poisonous, dirty Contaminate the generation of high component so that plating technic Environmental Safety, and prepare the corrosion-resistant height of coating, appearance looks elegant, matrix and The adhesion of zinc coating is high；Chemical reaction generation ammonia can occur with other compounds for sal-ammoniac during the electrogalvanizing of the present invention Water, the ammoniacal liquor of generation are used as complexing agent in electroplating process, and it is used in combination with neopelex, and complex performance is excellent It is different so that the crystallization of zinc coating is more careful, significantly reduces the porosity of zinc coating, improves the corrosion resistance of zinc coating Energy；In the present invention as negative electrode thick magnet piece current density it is too high when, a large amount of hydrogen will be separated out on negative electrode, cause electric current to imitate Rate declines, the phenomenon that coating performance reduces, and when current density is relatively low, zinc coating deposition anomaly is will appear from, as preferred , the current density that above-mentioned electrogalvanizing process uses is 12 mA/cm2。

The plating solution that the electronickelling process of the present invention uses with the addition of n-octyl sodium sulphate, can effectively prevent coating from producing pin Hole, the addition of n-octyl sodium sulphate is excessive or the very few thickness evenness that all nickel coating surface can be made to grow dim, influence nickel coating, And then lower the decay resistance of magnet；Boric acid is used as buffer in this application, has the function that to stablize pH value, the amount of boric acid Burr and coarse can excessively be caused；In Ni-Speed, the addition of nano silicon, it can effectively suppress metallic nickel crystal edge Its dendrite arm direction is grown up, and constantly produces new nucleus, effectively increases nickel coating compactness, reduces the porosity of nickel coating, Improve the antiseptic power of magnet；Yttrium sulfate can act synergistically with nano silicon, and obtained nickel coating not only crystallizes carefully Cause, porosity is extremely low, while improves the dispersibility of plating nickel plating bath, improves the thickness of the nickel coating between different current densities Uniformity is spent, is effectively improved the corrosion resistance of nickel coating；Triethanolamine and the unstable constant that nickel is complexed are smaller, simultaneously Triethanolamine can form more stable complex ion with zinc ion and nickel ion, effectively enhance the compactness of nickel coating, The bright plating of nickel coating is improved, improves the corrosion resistance of nickel coating.

Embodiment

For the ease of the understanding of those skilled in the art, with reference to embodiment, the present invention is further illustrated, real The content that the mode of applying refers to not is limitation of the invention.

Embodiment 1

A kind of processing method of Nd-Fe-B permanent magnet, comprises the following steps：A, stock up, get cylindric raw material ready；B, stack, The raw material got ready in step A is stacked and is bonded on asbestos board, obtains binding material block；C, cut, first impose uniformity without examining individual cases and remove in step B The end rim charge of obtained binding material block, then cut by product size requirement single solution for diverse problems to obtain one piece of semi-finished product material block and clout block； D, decoction made from powder, the semi-finished product material block that step C is obtained is placed in progress decoction made from powder processing, semi-finished product material block in the water cooking liquid added with additive It is scattered to obtain thick magnet piece by decoction made from powder；E, size Control and chamfered, the thick magnet piece that step D is obtained are placed in sander Middle carry out grinding process, then chamfered is done to thick magnet piece；F, electroplate and magnetize, the thick magnet piece obtained to step E is carried out Electroplating processes, electroplating processes are completed to carry out processing of magnetizing to thick magnet piece again, obtain finished product magnet, electroplating processes process is wrapped successively Include electrogalvanizing process and electronickelling process.

It is 502 glue that raw material, which stacks used binding agent when bonding, in the step B.

Additive in the step D is NaCl and caustic soda with mass ratio 2:The mixture of 1 composition, water temperature are 40 DEG C.

The step D is further comprising the steps of：Decoction made from powder processing, obtained bulk cargo are carried out to the clout block in the step C Return in the step B, such circular treatment, untill remaining bulk cargo is not enough to the product of production standard size.

When raw material in the step A is cylindric raw material, also include punch out step in the step D, obtained to scattered Thick magnet piece carry out punching processing, columned thick magnet piece gets through hole, gets through hole using first being positioned with short sword, then use rimmer knife Get through the hole knockout in hole.

The step D also includes hot blast air drying steps, and the thick air-dried processing of magnet piece progress blowing hot-air is obtained to scattered.

The product size precision controlling of grinding process is in ± 0.02mm in the step E.

The plating solution that electrogalvanizing process in the step F uses is formed as zinc sulfate 35g/L, boric acid 18g/L, dodecyl Benzene sulfonic acid sodium salt 40g/L, potassium phosphate 110g/L, sal-ammoniac 26g/L, surplus are water, and electroplating temperature is 40 DEG C, and electroplating time is 41min, current density 10mA/cm2, pH 4.5, the thickness of zinc coating is 6 μm.

The plating solution that electronickelling process in the step F uses is formed as nickel sulfate 150g/L, the g/L of boric acid 30, n-octyl Sodium sulphate 1g/L, nano silicon 0.1g/L, dipotassium hydrogen phosphate 30g/L, diammonium hydrogen citrate 70g/L, yttrium sulfate 1g/L, three Monoethanolamine 4g/L, surplus are water, and electroplating temperature is 50 DEG C, electroplating time 41min, current density 8mA/cm2, pH is 4.5, the thickness of nickel coating is 5 μm.

Also include thick magnet piece degreasing cleaning before electroplating processes process in the step F, washed with weak acid The greasy dirt on thick magnet piece surface is removed, then is cleaned thick magnet piece with clear water.

Embodiment 2

The present embodiment and the difference of embodiment 1 are：

Additive in the step D is NaCl and caustic soda with mass ratio 2:The mixture of 2 compositions, water temperature are 60 DEG C.

The product size precision controlling of grinding process is in ± 0.03mm in the step E.

The plating solution that electrogalvanizing process in the step F uses is formed as zinc sulfate 38g/L, boric acid 20g/L, dodecyl Benzene sulfonic acid sodium salt 45g/L, potassium phosphate 130g/L, sal-ammoniac 28g/L, surplus are water, and electroplating temperature is 43 DEG C, and electroplating time is 43min, current density 12mA/cm2, pH 5, the thickness of zinc coating is 8 μm.

The plating solution that electronickelling process in the step F uses is formed as nickel sulfate 200g/L, boric acid 35g/L, n-octyl Sodium sulphate 1.2g/L, nano silicon 0.6g/L, dipotassium hydrogen phosphate 35g/L, diammonium hydrogen citrate 100g/L, yttrium sulfate 1.5g/L, triethanolamine 6g/L, surplus are water, and electroplating temperature is 55 DEG C, electroplating time 43min, current density 10mA/ cm2, pH 5, the thickness of nickel coating is 7 μm.

Embodiment 3

The present embodiment and the difference of embodiment 1 are：

Additive in the step D is NaCl and caustic soda with mass ratio 2:The mixture of 3 compositions, water temperature are 80 DEG C.

The product size precision controlling of grinding process is in ± 0.03mm in the step E.

The plating solution that electrogalvanizing process in the step F uses is formed as zinc sulfate 40g/L, boric acid 22g/L, dodecyl The g/L of benzene sulfonic acid sodium salt 50, potassium phosphate 150g/L, sal-ammoniac 30g/L, surplus are water, and electroplating temperature is 45 DEG C, and electroplating time is 45min, current density 15mA/cm2, pH 5.5, the thickness of zinc coating is 10 μm.

Plating solution that electronickelling process in the step F uses is formed as the g/L of the nickel sulfate 250, g/L of boric acid 40, just pungent The g/L of base sodium sulphate 1.5, the g/L of nano silicon 1, dipotassium hydrogen phosphate 40g/L, the g/L of diammonium hydrogen citrate 120, yttrium sulfate 2 G/L, the g/L of triethanolamine 8, surplus are water, and electroplating temperature is 60 DEG C, electroplating time 45min, current density 12mA/cm2, PH is 5.5, and the thickness of nickel coating is 9 μm.

Embodiment 4

A kind of processing method of Nd-Fe-B permanent magnet, comprises the following steps：A, stock up, get block stock ready；B, stack, will The raw material got ready in step A is stacked and is bonded on asbestos board, obtains binding material block；C, cut, first imposing uniformity without examining individual cases to remove in step B obtains The end rim charge of the binding material block arrived, then cut by product size requirement single solution for diverse problems to obtain one piece of semi-finished product material block and clout block；D、 Decoction made from powder, the semi-finished product material block that step C is obtained is placed in progress decoction made from powder processing, semi-finished product material block quilt in the water cooking liquid added with additive Decoction made from powder, it is scattered to obtain thick magnet piece；E, size Control and chamfered, the thick magnet piece that step D is obtained are placed in sander Grinding process is carried out, then chamfered is done to thick magnet piece；F, electroplate and magnetize, the thick magnet piece obtained to step E carries out electricity Plating, electroplating processes are completed to carry out processing of magnetizing to thick magnet piece again, obtain finished product magnet, electroplating processes process includes successively Electrogalvanizing process and electronickelling process.

It is 502 glue that raw material, which stacks used binding agent when bonding, in the step B.

Additive in the step D is NaCl and caustic soda with mass ratio 2:The mixture of 1 composition, water temperature are 40 DEG C.

The step D is further comprising the steps of：Decoction made from powder processing, obtained bulk cargo are carried out to the clout block in the step C Return in the step B, such circular treatment, untill remaining bulk cargo is not enough to the product of production standard size.

The step D also includes hot blast air drying steps, and the thick air-dried processing of magnet piece progress blowing hot-air is obtained to scattered.

The product size precision controlling of grinding process is in ± 0.02mm in the step E.

The plating solution that electrogalvanizing process in the step F uses is formed as zinc sulfate 35g/L, boric acid 18g/L, dodecyl Benzene sulfonic acid sodium salt 40g/L, potassium phosphate 110g/L, sal-ammoniac 26g/L, surplus are water, and electroplating temperature is 40 DEG C, and electroplating time is 41min, current density 10mA/cm2, pH 4.5, the thickness of zinc coating is 6 μm.

The plating solution that electronickelling process in the step F uses is formed as nickel sulfate 150g/L, boric acid 30g/L, n-octyl Sodium sulphate 1g/L, nano silicon 0.1g/L, dipotassium hydrogen phosphate 30g/L, diammonium hydrogen citrate 70g/L, yttrium sulfate 1g/L, three Monoethanolamine 4g/L, surplus are water, and electroplating temperature is 50 DEG C, electroplating time 41min, current density 8mA/cm2, pH is 4.5, the thickness of nickel coating is 5 μm.

Also include thick magnet piece degreasing cleaning before electroplating processes process in the step F, washed with weak acid The greasy dirt on thick magnet piece surface is removed, then is cleaned thick magnet piece with clear water.

Embodiment 5

The present embodiment and the difference of embodiment 4 are：

Additive in the step D is NaCl and caustic soda with mass ratio 2:The mixture of 2 compositions, water temperature are 60 DEG C.

The product size precision controlling of grinding process is in ± 0.02mm in the step E.

The plating solution that electrogalvanizing process in the step F uses is formed as zinc sulfate 37g/L, boric acid 20g/L, dodecyl Benzene sulfonic acid sodium salt 45g/L, potassium phosphate 140g/L, sal-ammoniac 28g/L, surplus are water, and electroplating temperature is 43 DEG C, and electroplating time is 43min, current density 13mA/cm2, pH 5, the thickness of zinc coating is 8 μm.

The plating solution that electronickelling process in the step F uses is formed as nickel sulfate 200g/L, the g/L of boric acid 35, n-octyl Sodium sulphate 1.3g/L, nano silicon 0.6g/L, dipotassium hydrogen phosphate 35g/L, diammonium hydrogen citrate 100g/L, yttrium sulfate 1.5g/L, triethanolamine 6g/L, surplus are water, and electroplating temperature is 55 DEG C, electroplating time 43min, current density 10mA/ cm2, pH 5, the thickness of nickel coating is 7 μm.

Embodiment 6

The present embodiment and the difference of embodiment 4 are：

Additive in the step D is NaCl and caustic soda with mass ratio 2:The mixture of 3 compositions, water temperature are 80 DEG C.

The product size precision controlling of grinding process is in ± 0.03mm in the step E.

The plating solution that electrogalvanizing process in the step F uses is formed as zinc sulfate 40g/L, boric acid 22g/L, dodecyl Benzene sulfonic acid sodium salt 50g/L, potassium phosphate 150g/L, sal-ammoniac 30g/L, surplus are water, and electroplating temperature is 45 DEG C, and electroplating time is 45min, current density 15mA/cm2, pH 5.5, the thickness of zinc coating is 10 μm.

Plating solution that electronickelling process in the step F uses is formed as the g/L of the nickel sulfate 250, g/L of boric acid 40, just pungent The g/L of base sodium sulphate 1.5, nano silicon 1g/L, dipotassium hydrogen phosphate 40g/L, the g/L of diammonium hydrogen citrate 120, yttrium sulfate 2g/L, the g/L of triethanolamine 8, surplus are water, and electroplating temperature is 60 DEG C, electroplating time 45min, current density 12mA/ cm2, pH 5.5, the thickness of nickel coating is 9 μm.

Above-described embodiment is the preferable implementation of the present invention, and in addition, the present invention can be realized with other manner, Do not depart from and any on the premise of present inventive concept obviously replace within protection scope of the present invention.

Claims (5)

  1. A kind of 1. processing method of Nd-Fe-B permanent magnet, it is characterised in that：Comprise the following steps：A, stock up, get ready it is block or Cylindric raw material；B, stack, the raw material got ready in step A is stacked and is bonded on asbestos board, obtains binding material block；C, cut Cut, first impose uniformity without examining individual cases and remove the end rim charge of the binding material block obtained in step B, then cut to obtain one piece by product size requirement single solution for diverse problems Semi-finished product material block and clout block；D, decoction made from powder, the semi-finished product material block that step C is obtained is placed in the water cooking liquid added with additive and carried out Decoction made from powder processing, semi-finished product material block are scattered to obtain thick magnet piece by decoction made from powder；E, size Control and chamfered, step D is obtained Thick magnet piece, which is placed in sander, carries out grinding process, then does chamfered to thick magnet piece；F, electroplate and magnetize, to step E Obtained thick magnet piece carries out electroplating processes, and electroplating processes are completed to carry out processing of magnetizing to thick magnet piece again, obtain finished product magnet, Electroplating processes process includes electrogalvanizing process and electronickelling process successively；
    Wherein, it is 502 glue that raw material, which stacks used binding agent when bonding, in the step B；
    Wherein, the additive in the step D is NaCl and caustic soda with mass ratio 2:The mixture of 1-3 compositions, water temperature 40-80 ℃；
    Wherein, the step D also includes hot blast air drying steps, and the thick air-dried processing of magnet piece progress blowing hot-air is obtained to scattered；
    Wherein, the electrogalvanizing process in the step F uses plating solution form for zinc sulfate 35-40g/L, boric acid 18-22g/L, Neopelex 40-50g/L, potassium phosphate 110-150g/L, sal-ammoniac 26-30g/L, surplus are water, and electroplating temperature is 40-45 DEG C, electroplating time 41-45min, current density 10-15mA/cm2, pH 4.5-5.5, the thickness of zinc coating is 6- 10μm；
    Wherein, the plating solution that the electronickelling process in the step F uses is formed as nickel sulfate 150-250g/L, boric acid 30-40g/ L, n-octyl sodium sulphate 1-1.5g/L, nano silicon 0.1-1g/L, dipotassium hydrogen phosphate 30-40g/L, diammonium hydrogen citrate 70-120g/L, yttrium sulfate 1-2g/L, triethanolamine 4-8g/L, surplus are water, and electroplating temperature is 50-60 DEG C, and electroplating time is 41-45min, current density 8-12mA/cm2, pH 4.5-5.5, the thickness of nickel coating is 5-9 μm.
  2. A kind of 2. processing method of Nd-Fe-B permanent magnet according to claim 1, it is characterised in that：The step D is also wrapped Include following steps：Decoction made from powder processing is carried out to the clout block in the step C, obtained bulk cargo is returned in the step B, so Circular treatment, untill remaining bulk cargo is not enough to the product of production standard size.
  3. A kind of 3. processing method of Nd-Fe-B permanent magnet according to claim 1, it is characterised in that：When in the step A Raw material when being cylindric raw material, also include punch out step in the step D, scattered obtained thick magnet piece carried out at punching Reason, columned thick magnet piece get through hole, get through hole use and are first positioned with short sword, then the hole knockout in hole is got through with rimmer knife.
  4. A kind of 4. processing method of Nd-Fe-B permanent magnet according to claim 1, it is characterised in that：Beaten in the step E The product size precision controlling of processing is ground in ± 0.02-0.03mm.
  5. A kind of 5. processing method of Nd-Fe-B permanent magnet according to claim 1, it is characterised in that：In the step F Electroplating processes process before also include thick magnet piece degreasing cleaning, the greasy dirt on thick magnet piece surface is washed away with weak acid, Thick magnet piece is cleaned with clear water again.
CN201510838098.2A 2015-11-26 2015-11-26 A kind of processing method of Nd-Fe-B permanent magnet CN105336490B (en)

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CN106623911B (en) * 2016-08-30 2019-03-05 浙江凯文磁业有限公司 A kind of preparation method of the motor of elevated operating temperature sintered NdFeB magnetic shoe
CN106521586A (en) * 2016-11-28 2017-03-22 宁波韵升股份有限公司 Electrogalvanizing method of neodymium iron boron magnet
CN107134359B (en) * 2017-05-08 2019-08-20 廊坊京磁精密材料有限公司 The processing method of sintered NdFeB
CN108831730A (en) * 2018-06-04 2018-11-16 安徽天宇磁业股份有限公司 A kind of preparation process of permanent magnet
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CN110170797A (en) * 2019-05-28 2019-08-27 浙江鑫盛永磁科技有限公司 Convenient for the Nd-Fe-B permanent magnet processing method of feeding
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