WO2015096277A1 - Mixed powder for rapidly removing forged burrs of rivet electrical contact, and using method therefor - Google Patents

Abstract

Mixed powder for rapidly removing forged burrs of a rivet electrical contact, and a using method therefor. The mixed powder comprises following components: iron sesquioxide, ferrous oxide, magnesium oxide, yttrium oxide and zirconium oxide. The grain size of iron sesquioxide is 50 to 300μm and the mass part is 50 to 120 parts; the grain size of ferrous oxide is 20 to 100μm and the mass part is 30 to 60 parts; the grain size of magnesium oxide is 50 to 200μm and the mass part is 1 to 5 parts; the grain size of yttrium oxide is 5 to 100μm and the mass part is 1 to 5 parts; and the grain size of zirconium oxide is 5 to 150 μm and the mass part is 4 to 15 parts. The mixed powder has the effects that the speed of removing the burrs is high; no crimped edges and no residues are formed; the surface roughness of the contact is more uniform.

Description

 Mixed powder for quickly removing burr electric contact pier burr and using method thereof Technical field

 The invention belongs to the field of surface treatment, in particular to a mixed powder for quickly removing burrs of rivet electrical contact piers and a using method thereof.

Background technique

At present, rivet type electrical contacts are widely used in electrical appliances such as switches, relays, temperature controllers, contactors, miniature circuit breakers, etc., and have the characteristics of low manufacturing cost and strong applicability; as the core component of electrical appliances, the appearance of rivet electrical contacts And dimensional stability directly affects the assembly and use performance of electrical appliances.

The main materials involved in the rivet type electrical contact are silver tin oxide, silver cadmium oxide, silver nickel, sterling silver and pure copper. The surface of these metal parts is easy to be flashed at the edges and small micro-metal scraps during the processing of the rivets from the wire. This is known as the overflow burr, and the presence of burrs is used for the assembly and use of the contacts. The product has a large influence. In severe cases, the contact welding will occur and the appliance will not work. Generally, the causes of electrical contact burrs include: (1) excessive feed; (2) cutter passivation; (3) punch wear; (4) improper deformation adjustment. The method of removing the rivet electrical contact and the overflow burr is to adopt the centrifugal roller polishing method, which is to rotate the workpiece and the abrasive rapidly, and generate a centrifugal force 50 times than the self-strength, so that the workpiece and the abrasive are tightly squeezed in the grinding tank. Pressed together, driven by the rotation speed and the revolution speed, the friction is formed, and the strong grinding of the surface of the workpiece is achieved for a short time to achieve the polishing of the metal surface. Usually, the abrasive is made of a resin to bond the silica or alumina powder into a block shape, and then the blank, the sizing agent and the water after the rivet electrical contact are pressed into a grinding tank of about 7.5L, and then loaded. The grinder is subjected to deburring at a speed of 1200 r/min and a time of 1.5 to 2.5 hours. This kind of treatment method has low grinding force, can not effectively and quickly remove the burr, is prone to curling phenomenon, and causes dimensional instability, and the early riveting occurs when the automatic riveting card material contacts the burr even when the contact is in service; The method has low production efficiency and poor product consistency.

technical problem

The object of the present invention is to overcome the shortcomings and deficiencies of the prior art, and to provide a burr-free electrical contact pier burr with fast burr removal efficiency, no curling, no residue, and more uniform surface roughness of the contact. Mixed powder.

 Another object of the present invention is to provide a method of using the above-described mixed powder for rapidly removing burrs of rivet electrical contact burrs.

Technical solution

 In order to achieve the first object of the present invention, the technical solution of the present invention comprises the following components in parts by mass:

 50 to 120 parts of ferric oxide;

 30~60 parts of ferrous oxide ;

 Magnesium oxide 1~5 parts;

 1 to 5 parts of cerium oxide;

 4~15 parts of zirconia ;

 The particle size of ferric oxide is 50μm~300μm, and the particle size of ferrous oxide is 20μm~100μm. The size of the magnesium oxide particles is 50 μm to 200 μm, the particle size of the cerium oxide is 5 μm to 100 μm, and the particle size of the zirconia particles is 5 μm to 150 μm.

 Further, the material of the rivet electrical contact is silver tin oxide, and the components in the mixed powder are in parts by mass: ferric oxide 100~120 parts, 50~60 parts of ferrous oxide, 4~5 parts of magnesia, 4~5 parts of yttrium oxide and 8~10 parts of zirconia.

 Further, the material of the rivet electrical contact is silver cadmium oxide, and the components in the mixed powder are in parts by mass: ferric oxide 90~110 parts, 40~55 parts of ferrous oxide, 4~5 parts of magnesia, 4~5 parts of yttrium oxide and 13~15 parts of zirconia.

 Further, the material of the rivet electrical contact is a silver-nickel alloy as a whole, and the components in the mixed powder are in parts by mass: ferric oxide 70~90 parts, 35~40 parts of ferrous oxide, 4~5 parts of magnesia, 4~5 parts of yttrium oxide and 13~14 parts of zirconia.

Further, the rivet electrical contact is made of silver as a whole or a silver-based copper rivet electrical contact. The components of the mixed powder are, in parts by mass: 50 to 70 parts of ferric oxide, oxidized. Ferrous 30~40 Parts: 1 to 3 parts of magnesium oxide, 1 to 3 parts of cerium oxide, and 4 to 8 parts of zirconia.

 In order to achieve the second object of the present invention, the technical solution of the present invention includes the following steps:

 (1) Put the rivet electrical contact blanks after the tamping into the grinding jar, according to the quality of the blanks 1.5%~4% Adding the mixed powder according to one of claims 1 to 5, adding the sizing agent, adding water to the position of 70% to 80% of the volume of the grinding tank, and charging the centrifugal grinder to set the rotation speed. 1100~1400r/min, about 30min, take out and rinse to separate the product.

 After the further setting is the step (1), the following steps are also performed:

 (2) The product after deburring is placed in a vacuum furnace for annealing, and the temperature is set at 300~400 °C. After 40~90min, take it out to the room temperature with the furnace;

 (3) pickling the product with dilute sulfuric acid, remove the surface oxide scale or other foreign matter, and then rinse it off;

 (4) Using a roll-throwing machine to smooth the product and then rinse the product clean;

 (5) Put the product into an ultrasonic cleaning device for ultrasonic cleaning;

 (6) The cleaned product is then dried, dried and cooled to the finished product.

Beneficial effect

 The advantages and positive effects of the invention: 1 Adding mixed powder in the rolling polishing process, the workpiece is subjected to greater friction and uniformity during the abrasive process, and can cover every corner; 2 It is easier to separate after deburring with mixed powder, and the powder is more easily pickled and removed, and the contact resistance of the contact is lower;

 3. The process design of the invention is simple in operation, low in production efficiency, low in labor intensity, and suitable for mass production.

 4 According to the particle shape, size, specific gravity and hardness characteristics of the workpiece, the matched mixed powder is added into water to form a turbid liquid in which the powder particles are suspended in water, and the workpiece and the liquid powder are under the action of high speed rotation. The particles rubbed violently to remove burrs on the surface of the workpiece.

 The present invention will be further described below in conjunction with specific embodiments.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention is specifically described by the following examples, which are only used to further illustrate the present invention, and are not to be construed as limiting the scope of the present invention. The technical engineer in the field may make some non-essential improvements to the present invention according to the contents of the above invention. Adjustment.

Embodiment 1:

1 Put 7kg of silver tin oxide whole rivet electrical contact blank after 镦 molding into 7.5L grinding tank, add 110g of ferric oxide, 55g of ferrous oxide, 4.5g of magnesia, 4.5g of yttrium oxide, zirconia 9g of mixed powder, and add sizing agent, add water to the position of 70% ~ 80% of the volume of the grinding tank, into the centrifugal grinder, set the speed of 1200r / min, about 30min, remove and rinse to separate the product.

2 The product after deburring is placed in a vacuum furnace and annealed. The temperature is set at 400 ° C, the temperature is kept for about 50 minutes, and then taken out from the furnace to room temperature.

3 Pickle the product with dilute sulfuric acid, remove the surface oxide scale or other foreign matter, and then rinse off.

4 Use a roll-on machine to clean the product and rinse the product.

5 Place the product in an ultrasonic cleaning device for ultrasonic cleaning.

6 The cleaned product is then dried, dried and cooled to the finished product.

Embodiment 2:

1 6.5kg of silver tin oxide copper rivet electrical contact blanks after tamping is put into 7.5L grinding tank, adding 65g of ferric oxide, 35g of ferrous oxide, 2g of magnesia, 2g of yttrium oxide, zirconia 6g of mixed powder, and add sizing agent, add water to the position of 70% ~ 80% of the volume of the grinding tank, into the centrifugal grinder, set the speed of 1300r / min, about 30min, take out and rinse to separate the product.

2 The product after deburring is placed in a vacuum furnace and annealed. The temperature is set at 320 ° C, and the temperature is maintained for about 60 minutes, and then taken out from the furnace to room temperature.

3 Pickle the product with dilute sulfuric acid, remove the surface oxide scale or other foreign matter, and then rinse off.

4 Use a roll-on machine to clean the product and rinse the product.

5 Place the product in an ultrasonic cleaning device for ultrasonic cleaning.

6 The cleaned product is then dried, dried and cooled to the finished product.

Embodiment 3:

1 Put 6.3kg of silver cadmium oxide rivet electrical contact blank after 镦 molding into 7.5L grinding tank, add 100g of ferric oxide, 50g of ferrous oxide, 4.5g of magnesium oxide, 4.5g of cerium oxide, oxidation Zirconium 14g mixed powder, and added with sizing agent, add water to the position of 70%~80% of the volume of the grinding tank, and put it into the centrifugal grinder to set the rotation speed of 1300r/min. After about 30min, take out and rinse to separate the product.

2 The product after deburring is placed in a vacuum furnace and annealed. The temperature is set at 350 ° C, the temperature is maintained for about 80 minutes, and then taken out from the furnace to room temperature.

3 Pickle the product with dilute sulfuric acid, remove the surface oxide scale or other foreign matter, and then rinse off.

4 Use a roll-on machine to clean the product and rinse the product.

5 Place the product in an ultrasonic cleaning device for ultrasonic cleaning.

6 The cleaned product is then dried, dried and cooled to the finished product.

Embodiment 4:

1 Put 5kg of silver-nickel rivet electrical contact blanks after 镦 molding into 7.5L grinding jar, add 80g of ferric oxide, 40g of ferrous oxide, 4.5g of magnesia, 4.5g of yttrium oxide, 13.5 zirconia Mix the powder of g, add the sizing agent, add water to the position of 70%~80% of the volume of the grinding tank, and put it into the centrifugal grinder to set the speed of 1400r/min. After about 30min, take out and rinse to separate the product.

2 The product after deburring is placed in a vacuum furnace and annealed. The temperature is set at 300 ° C, and the temperature is maintained for about 70 minutes, and then taken out from the furnace to room temperature.

3 Pickle the product with dilute sulfuric acid, remove the surface oxide scale or other foreign matter, and then rinse off.

4 Use a roll-on machine to clean the product and rinse the product.

5 Place the product in an ultrasonic cleaning device for ultrasonic cleaning.

6 The cleaned product is then dried, dried and cooled to the finished product.

Embodiment 5:

1 Put 3kg of silver integral rivet electrical contact blank after tamping into 7.5L grinding tank, add 55g of ferric oxide, 30g of ferrous oxide, 1.5g of magnesia, 1.5g of yttrium oxide, 5g of zirconia Mix the powder, add the sizing agent, add water to the position of 70%~80% of the volume of the grinding tank, and put it into the centrifugal grinder to set the speed of 1200r/min. After about 30min, take out and rinse to separate the product.

2 The product after deburring is placed in a vacuum furnace and annealed. The temperature is set at 300 ° C, and the temperature is maintained for about 45 minutes, and then taken out from the furnace to room temperature.

3 Pickle the product with dilute sulfuric acid, remove the surface oxide scale or other foreign matter, and then rinse off.

4 Use a roll-on machine to clean the product and rinse the product.

5 Place the product in an ultrasonic cleaning device for ultrasonic cleaning.

6 The cleaned product is then dried, dried and cooled to the finished product.

Embodiments of the invention

Industrial applicability

Sequence table free content

Claims (7)

1.  A mixed powder for quickly removing burrs of rivet electrical contact piers, characterized by comprising the following components in parts by mass:

   50 to 120 parts of ferric oxide;

   30-60 parts of ferrous oxide;

   1 to 5 parts of magnesium oxide;

   1 to 5 parts of cerium oxide;

   Zirconium oxide 4~15 parts;

   The particle size of ferric oxide is 50μm~300μm, the size of ferrous oxide particles is 20μm~100μm, the size of magnesium oxide particles is 50μm~200μm, the size of cerium oxide particles is 5μm~100μm, and the size of zirconia particles is 5μm~150μm.
2. The mixed powder for quickly removing burr electrical contact piercing burrs according to claim 1, wherein the rivet electrical contact is made of silver tin oxide, and the components of the mixed powder are The mass parts are: 100~120 parts of ferric oxide, 50~60 parts of ferrous oxide, 4~5 parts of magnesium oxide, 4~5 parts of yttrium oxide and 8~10 parts of zirconia.
3. The hybrid powder for quickly removing rivet electrical contact piercing burrs according to claim 1, wherein the rivet electrical contact is made of silver cadmium oxide, and the components of the mixed powder are The mass parts are: 90~110 parts of ferric oxide, 40~55 parts of ferrous oxide, 4~5 parts of magnesium oxide, 4~5 parts of yttrium oxide and 13~15 parts of zirconia.
4. The hybrid powder for quickly removing rivet electrical contact piercing burrs according to claim 1, wherein the rivet electrical contact is made of a silver-nickel alloy as a whole, and the components of the mixed powder are In terms of parts by mass: 70-90 parts of ferric oxide, 35-40 parts of ferrous oxide, 4-5 parts of magnesium oxide, 4-5 parts of cerium oxide, and 13-14 parts of zirconia.
5. The method according to claim 1 , wherein the rivet electrical contact is made of silver or silver-based copper rivet electrical contacts. The components in the powder are, in parts by mass: 50 to 70 parts of ferric oxide, 30 to 40 parts of ferrous oxide, 1 to 3 parts of magnesium oxide, 1 to 3 parts of cerium oxide, and 4 to 8 parts of zirconia. .
6. A method for rapidly removing a mixed powder of a rivet electrical contact burr, comprising the steps of:

   (1) Inserting the rivet electrical contact blanks after the tamping into the grinding jar, adding the mixed powder according to one of claims 1 to 5 at a ratio of 1.5% to 4% of the mass of the blank, and adding the sizing agent, and then adding Add water to the position of 70%~80% of the volume of the grinding tank, and put it into the centrifugal grinding machine, set the rotation speed of 1100~1400r/min. After about 30min, take out and rinse to separate the product.
7. The method for rapidly removing the mixed powder of the rivet electrical contact burr according to claim 6, wherein after the step (1), the following steps are further performed:

   (2) The product after deburring is placed in a vacuum furnace for annealing, the temperature is set at 300~400 °C, the temperature is maintained for about 40~90 minutes, and then taken out at room temperature to the room temperature;

   (3) pickling the product with dilute sulfuric acid, remove the surface oxide scale or other foreign matter, and then rinse it off;

   (4) Using a roll-throwing machine to smooth the product and then rinse the product;

   (5) placing the product in an ultrasonic cleaning device for ultrasonic cleaning;

   (6) The cleaned product is then dried, dried and cooled to the finished product.