CN101814349A - Moulding mould for thermistors and method for manufacturing thermistors - Google Patents
Moulding mould for thermistors and method for manufacturing thermistors Download PDFInfo
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- CN101814349A CN101814349A CN200910105625A CN200910105625A CN101814349A CN 101814349 A CN101814349 A CN 101814349A CN 200910105625 A CN200910105625 A CN 200910105625A CN 200910105625 A CN200910105625 A CN 200910105625A CN 101814349 A CN101814349 A CN 101814349A
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Abstract
The invention is suitable for the field of manufacture of miniature precision sensors, and provides a moulding mould for thermistors and a method for manufacturing the thermistors. The mould comprises an upper mould and a lower mould, wherein the upper mould is provided with a plurality of upper groove bodies arranged linearly; two parallel upper slots penetrate each upper groove body; the lower mould is provided with lower groove bodies and lower slots which are correspondingly matched with the upper groove bodies and upper slots of the upper mould respectively; and the upper and lower moulds are also provided with positioning parts capable of making the upper and lower moulds embedded. In the invention, the forming of the thermistors and the embedding of leads are finished simultaneously by the precision mould, so the work efficiency is obviously improved; and the manufactured thermistors have consistent beads, so the thermistors have consistent resistance value and high precision.
Description
Technical field
The invention belongs to the manufacturing field of miniature sophisticated sensor, relate in particular to a kind of manufacture method of mould and thermistor of thermistor.
Background technology
The pearl NTC of the glass packaging (abbreviation of Negative Temperature Coefficient, negative temperature coefficient) thermistor can use in-60～450 ℃ of temperature ranges, has the temperature-controlled precision height, the characteristics that temperature drift is little, be applicable to adverse circumstances: protection against the tide, waterproof, preventing dust etc. have been widely used in fields such as office equipment, household electrical appliance, medical treatment, automobile, space flight.
Pearl NTC thermistor is divided into two classes according to the method that electrode forms, the first kind is the two-face printing silver palladium slurry process burning infiltration formation in the NTC pottery square plate that sinters, cut into little side's sheet of 1x1mm again, little side's sheet is encapsulated in the glass after pin one end connects by gold paste, but since silver-colored palladium electrode at high temperature stability be weak, so produced second class methods again, its moulding process is as follows:
Adopt the parallel placement of platinum wire of two diameter 0.02-0.1, the control spacing is at 0.15mm to 0.75mm, as shown in Figure 1;
Again the NTC slurry is coated with on line, forms the beads of bridge joint two lines, be coated with some beads along line every 10mm, as shown in Figure 2;
After the drying, the bead of bunchiness is placed on sintering in the kiln, is cut into as shown in Figure 3 radial lead and axial lead;
Overlap one deck glass tube at last again, burn and melt the covering bead.
The NTC that second class methods are made has higher stability, but homogeneity of product is poor, this is caused by its moulding process, the resistance of pearl NTC thermistor is the function of line thickness, line gap, thermistor material quality and the shape of depositing, wherein the bead shape is crucial, the bead shape of pearl NTC thermistor is inconsistent, will cause its resistance value inconsistent, the problem that precision is low.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of mould of thermistor, exists the bead shape inconsistent when being intended to solve present pearl NTC thermistor moulding, thereby causes its resistance value inconsistent, the problem that precision is low.
The embodiment of the invention is achieved in that a kind of mould of thermistor, comprise upper die and lower die, described patrix is provided with a plurality of upper groove bodies that are in line and arrange, be penetrated with two parallel last wire casings between each upper groove body, described counterdie is provided with respectively and the upper groove body of described patrix and the lower groove and the following wire casing of last wire casing corresponding matching, on described upper die and lower die, also be respectively equipped with the positioning element that can make described upper die and lower die chimeric.
Another purpose of the embodiment of the invention is to provide a kind of manufacture method of thermistor, and described method comprises the steps:
S1, manufacturing NTC slurry;
S2, two platinum wires are put into twice wire casings of above-mentioned mould counterdie, the platinum wire two ends are fixed with fixed part, and platinum wire is tightened, and are fitted in down in the wire casing;
S3, the upper die and lower die of described mould are chimeric makes and forms the die cavity of filling the NTC slurry between the upper die and lower die;
S4, the NTC slurry is injected in the die cavity of described mould one by one;
S5, treat after slurry solidifies described upper and lower mould to be separated, form catenate NTC and give birth to embryo;
S6, described NTC is given birth to embryo put into the high temperature kiln sintering, generate the bead of bunchiness;
S7, cutting platinum wire separate described bead;
S8, platinum wire and outer lead are welded;
S9, the junction of described bead and outer lead is overlapped one deck glass tube again, in the glass banking, glass tube is melted, finish the encapsulation of element.
In embodiments of the present invention, with the thermistor moulding with bury lead-in wire underground and finish simultaneously, significantly improve work efficiency, and make the bead shape unanimity of produced thermistor with precision die, thus its resistance value unanimity, the precision height.
Description of drawings
Fig. 1 is the structure chart that adopts the platinum wire of originaling forming technology;
Fig. 2 is the structure chart that adopts the bunchiness bead of originaling forming technology generation;
Fig. 3 is the structure chart that adopts the bead after originaling forming technology is cut off;
Fig. 4 is the structure chart of the patrix of the mould that provides of the embodiment of the invention;
Fig. 5 is the structure chart of the counterdie of the mould that provides of the embodiment of the invention;
Fig. 6 is the structure chart of the fixedly platinum wire that provides of the embodiment of the invention;
Fig. 7 is the installation diagram of the upper die and lower die of the mould that provides of the embodiment of the invention;
Fig. 8 is the flow chart of the manufacture method of the thermistor that provides of the embodiment of the invention;
Fig. 9 is the structure chart of the bunchiness bead made of the manufacture method of the employing thermistor that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
In embodiments of the present invention, with the thermistor moulding with bury lead-in wire underground and finish simultaneously, significantly improve work efficiency, and make the bead shape unanimity of produced thermistor with precision die, thus its resistance value unanimity, the precision height.
Fig. 4 shows the structure of the patrix of the mould that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
Referring to Fig. 4, in the specific embodiment of the invention, patrix 100 is a strip member, which is provided with a plurality of upper groove bodies 101 that are in line and arrange, become 90 ° of intersections to be penetrated with two parallel last wire casings 102 between each upper groove body 101, in patrix 100 each upper groove body 101 two ends, also be respectively equipped with alignment pin 103 and last location hole 104 on one.
Fig. 5 shows the structure of the counterdie of the mould that the embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
Referring to Fig. 5, in the specific embodiment of the invention, counterdie 200 also is the strip member corresponding with patrix 100 shapes, be respectively equipped with the lower groove 201 and the following wire casing 202 that can match on it with the upper groove body 101 and the last wire casing 102 of patrix 100, two ends in the lower groove 201 of described counterdie 200, also be respectively equipped with the following location hole 204 and the following alignment pin 203 that can match with the last alignment pin 103 and the last location hole 104 of patrix 100, two ends at the following wire casing 202 of described counterdie 200, be positioned at alignment pin 203 down, between following location hole 204 and the lower groove 201, also be provided with fixed part, the two ends of the following wire casing 202 of counterdie 200 are provided with groove 205, fixed part is arranged on 205 li of grooves, as one embodiment of the invention, this fixed part can be dog screw 206.
Fig. 6 shows the structure of the fixedly platinum wire that the embodiment of the invention provides, in the actual processing, platinum wire 207 two ends are fixing with dog screw 206, platinum wire 207 is tightened, be fitted in down in the wire casing 202, last wire casing 102 and following wire casing 202 width are less than 0.5mm, and separation is less than or equal to 0.4mm, and it is chimeric to be convenient to platinum wire 207.
Fig. 7 shows the assembly structure of the upper die and lower die of the mould that the embodiment of the invention provides.As one embodiment of the invention, the cross section of upper groove body 101 and lower groove 201 is semicircles, just can form cylindrical die cavity 300 after lower groove 201 corresponding matching of the upper groove body 101 of patrix 100 and counterdie 200, the diameter of cylindrical die cavity 300 is less than 1mm, length is less than 1.5mm, and is consistent with thermistor bead shape and size.
Fig. 8 shows the manufacture method of the thermistor that the embodiment of the invention provides, and details are as follows:
In step S1, make the NTC slurry;
This step is specially: at first prepare the NTC component material, technologies such as process is synthetic, ball milling are made dry powder, according to gel injection molding and forming technology with dry powder be dispersed in the aqueous solution that contains organic monomer and crosslinking agent, add initator and catalyst, make the NTC slurry to put into syringe standby through stirring the degassing.
In step S2, two platinum wires are put into two following wire casings of above-mentioned mould counterdie, the platinum wire two ends are fixed with fixed part, and platinum wire is tightened, and are fitted in down in the wire casing;
In step S3, the upper die and lower die of mould are chimeric, make and form the die cavity of filling the NTC slurry between the upper die and lower die;
In step S4, the NTC slurry is injected into one by one in the die cavity of mould;
This step is specially: the syringe needle with syringe is injected into the NTC slurry in each die cavity of mould one by one, and the unnecessary slurry that will overflow die cavity is removed with scraper.
In step S5, treat after slurry solidifies upper and lower mould to be separated, form catenate NTC and give birth to embryo;
In step S6, NTC to be given birth to embryo put into the high temperature kiln sintering, 1170 ℃-1300 ℃ of sintering temperatures be incubateds 3-6 hour, generate the bead of bunchiness, and Fig. 9 shows the structure of bunchiness bead of the manufacture method manufacturing of the employing thermistor that the embodiment of the invention provides;
In step S7, cutting platinum wire, bead isolation;
In step S8, platinum wire and outer lead are welded;
In step S9, the junction of bead and outer lead is overlapped one deck glass tube again, in the glass banking, glass tube is melted, finish the encapsulation of element.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the mould of a thermistor, comprise upper die and lower die, it is characterized in that, described patrix is provided with a plurality of upper groove bodies that are in line and arrange, be penetrated with two parallel last wire casings between each upper groove body, described counterdie is provided with respectively and the upper groove body of described patrix and the lower groove and the following wire casing of last wire casing corresponding matching, on described upper die and lower die, also is respectively equipped with the positioning element that can make described upper die and lower die chimeric.
2. mould as claimed in claim 1, it is characterized in that, described positioning element is alignment pin on being arranged on the patrix and last location hole, and the following location hole and the following alignment pin that are arranged on the counterdie, match with the last alignment pin and the last location hole of described patrix respectively, the two ends of the following wire casing of described counterdie also are provided with fixed part.
3. mould as claimed in claim 2 is characterized in that the two ends of the following wire casing of described counterdie are provided with groove, and described fixed part is arranged in the groove.
4. mould as claimed in claim 3 is characterized in that, described fixed part is a dog screw.
5. mould as claimed in claim 1, it is characterized in that described upper groove body and lower groove are the cell body that cross section is a semicircle, the upper groove body of described patrix and the lower groove of counterdie cooperate the cylindrical die cavity of formation, the diameter of described cylindrical die cavity is less than 1mm, and length is less than 1.5mm.
6. as claim 1 or 5 described moulds, it is characterized in that described upper and lower wire casing width is less than 0.5mm, each separation is less than or equal to 0.4mm.
7. the manufacture method of a thermistor is characterized in that, described method comprises the steps:
S1, manufacturing NTC slurry;
S2, two platinum wires are put into twice wire casings of each described mould counterdie of claim 1-6, the platinum wire two ends are fixed with fixed part, and platinum wire is tightened, and are fitted in down in the wire casing;
S3, the upper die and lower die of described mould are chimeric makes and forms the die cavity of filling the NTC slurry between the upper die and lower die;
S4, the NTC slurry is injected in the die cavity of described mould one by one;
S5, treat after slurry solidifies described upper and lower mould to be separated, form catenate NTC and give birth to embryo;
S6, described NTC is given birth to embryo put into the high temperature kiln sintering, generate the bead of bunchiness;
S7, cutting platinum wire separate described bead;
S8, platinum wire and outer lead are welded;
S9, the junction of described bead and outer lead is overlapped one deck glass tube again, in the glass banking, glass tube is melted, finish the encapsulation of element.
8. manufacture method as claimed in claim 7 is characterized in that, the step of described manufacturing NTC slurry is specially:
At first prepare the NTC component material, technologies such as process is synthetic, ball milling are made dry powder, according to gel injection molding and forming technology with dry powder be dispersed in the aqueous solution that contains organic monomer and crosslinking agent, add initator and catalyst, make the NTC slurry to put into syringe standby through stirring the degassing.
9. manufacture method as claimed in claim 8 is characterized in that, the step in the described die cavity that the NTC slurry is injected into one by one described mould is specially:
Syringe needle with syringe is injected into the NTC slurry in the die cavity of mould one by one, and the unnecessary slurry that will overflow die cavity is removed with scraper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101056253A CN101814349B (en) | 2009-02-24 | 2009-02-24 | Moulding mould for thermistors and method for manufacturing thermistors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101056253A CN101814349B (en) | 2009-02-24 | 2009-02-24 | Moulding mould for thermistors and method for manufacturing thermistors |
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| CN101814349A true CN101814349A (en) | 2010-08-25 |
| CN101814349B CN101814349B (en) | 2011-11-09 |
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| CN2009101056253A Active CN101814349B (en) | 2009-02-24 | 2009-02-24 | Moulding mould for thermistors and method for manufacturing thermistors |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103177836A (en) * | 2013-03-16 | 2013-06-26 | 东莞市安培龙电子科技有限公司 | Thermistor manufactured by ceramic thin films and manufacturing method of thermistor |
| CN106092364A (en) * | 2016-05-26 | 2016-11-09 | 句容市博远电子有限公司 | NTC temperature sensor inserted sheet process units and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1973117A (en) * | 1933-04-17 | 1934-09-11 | Micamold Radio Corp | Resistor molding apparatus |
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2009
- 2009-02-24 CN CN2009101056253A patent/CN101814349B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103177836A (en) * | 2013-03-16 | 2013-06-26 | 东莞市安培龙电子科技有限公司 | Thermistor manufactured by ceramic thin films and manufacturing method of thermistor |
| CN103177836B (en) * | 2013-03-16 | 2016-07-13 | 东莞市安培龙电子科技有限公司 | Adopt critesistor and the manufacture method thereof of ceramic membrane manufacture |
| CN106092364A (en) * | 2016-05-26 | 2016-11-09 | 句容市博远电子有限公司 | NTC temperature sensor inserted sheet process units and method |
| CN106092364B (en) * | 2016-05-26 | 2019-05-17 | 句容市博远电子有限公司 | NTC temperature sensor inserted sheet process units and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101814349B (en) | 2011-11-09 |
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Address after: 518111, Guangdong, Shenzhen District, Longgang District, Pinghu street, Pinghu community Fumin Industrial Zone, Fukang Road, No. 53, on the third floor, West Block Patentee after: Shenzhen Ampron Technology Co., Ltd. Address before: 518111, Guangdong Province, Shenzhen Town, Longgang District, Pinghu Province, goose ridge, Liang Bai Road, Guang Guang Industrial Park Patentee before: Shenzhen Ampron Technology Co., Ltd. |
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Address after: Building 1 to four, No. 65, No. 65, Fukang Road, Fumin Road, Fumin industrial district, Pinghu community, Pinghu street, Longgang District, Shenzhen, Guangdong Province Patentee after: SHENZHEN AMPRON TECHNOLOGY CORPORATION Address before: 518111, Guangdong, Shenzhen District, Longgang District, Pinghu street, Pinghu community Fumin Industrial Zone, Fukang Road, No. 53, on the third floor, West Block Patentee before: Shenzhen Ampron Technology Co., Ltd. |