CN109732791B - Graphite crucible processing technology - Google Patents
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Abstract
The invention discloses a graphite crucible processing technology, relates to the technical field of graphite processing, and solves the problem of raw material waste in the preparation of a graphite crucible in the prior art, wherein the technical scheme is characterized by comprising the following steps: a. selecting a graphite block; b. cutting; c. preliminary processing of a groove; d. cutting off waste materials; e. polishing the side wall of the groove; g. and (3) performing heat treatment, namely performing two times of processing through the primary processing cutter and the cutting cutter, so that the generated waste material is a cylindrical graphite block, the waste material can be reused in the production process of the graphite crucible, and raw materials are greatly saved.
Description
Technical Field
The invention relates to the technical field of graphite processing, in particular to a graphite crucible processing technology.
Background
Graphite has many excellent properties, so it is widely used in metallurgical, mechanical, electrical, chemical, textile and national defense industries. One of the main uses of graphite is in the production of refractory materials, including refractory bricks, crucibles, molds, and the like. Graphite crucibles are highly refractory, have low thermal expansion, are stable to metal infiltration and erosion during metal melting, have good thermal shock stability at high temperatures and excellent conductivity, and are therefore widely used in direct metal melting processes.
The graphite block that adopts the press forming in the middle of the process of carrying out graphite crucible production usually processes and makes, be the size that accords with through carrying out cutting process to the graphite block, then process out columniform recess on the graphite block through the mode of grinding to process the graphite block into graphite crucible, but the process that adopts this kind of processing recess is when can extravagant a large amount of materials, all processed into the graphite powder piece with the waste material, can't recycle in the middle of the process of carrying out graphite crucible production, there is the extravagant problem of raw and other materials.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a graphite crucible processing technology, which enables the generated waste material to be cylindrical graphite blocks through twice processing by a primary processing cutter and a cutting cutter, and can be reused in the production process of a graphite crucible, thereby greatly saving raw materials.
In order to achieve the purpose, the invention provides the following technical scheme: a graphite crucible processing technology comprises the following steps:
a. selecting graphite blocks: selecting graphite blocks which use graphite powder and medium-temperature coal pitch as raw materials for graphite block processing, wherein the mass percent of the graphite powder in the graphite powder and the medium-temperature coal pitch is 70-90%, the mass percent of the medium-temperature coal pitch is 10-30%, and the graphite blocks are not subjected to sintering treatment;
b. cutting: cutting a large graphite block into a plurality of small graphite blocks with the same size as the graphite crucible;
c. preliminary processing of a groove: fixing the cut graphite block on a three-jaw chuck of a lathe, and then fixing a primary processing cutter on the lathe; the lathe drives the graphite block to rotate through the three-jaw chuck, and pushes the primary machining cutter to move towards the direction close to the graphite block, the primary machining cutter starts to cut the graphite block after contacting the graphite block, then the primary machining cutter is fed continuously, the primary machining cutter performs primary machining on the graphite block, and a core column is formed on the graphite block;
d. cutting off waste materials: after the groove is subjected to primary machining, a primary machining cutter is detached from a lathe, a cutting-off cutter is installed, a cutter body and cutting-off teeth are inserted into the groove through feeding the cutting-off cutter, the feeding depth of the cutter body is equal to that of the primary machining cutter, then a fixing rod is rotated, the cutter body and the cutting-off teeth move towards the direction close to the axis of a core column, the core column is cut through the cutting-off teeth until the core column is cut off, and then the core column is taken down from a graphite block;
e. polishing the side wall of the groove: polishing the side wall of the groove by a grinding machine, polishing the side wall of the groove to a specified size, and improving the smoothness of the side wall of the groove by polishing by the grinding machine;
f. polishing the bottom of the groove: polishing one side of the bottom of the groove by a grinding machine to a specified depth, and improving the smoothness of the bottom of the groove by polishing by the grinding machine;
g. and (3) heat treatment: and putting the graphite crucible which is machined into a sintering furnace for heat treatment.
Through adopting above-mentioned technical scheme, divide twice through the primary processing cutter and cut off the cutter and process the graphite piece for the waste material is cylindricly after the processing, can process in the middle of small-size graphite jig's the processing production process and utilize, has reduced the waste to raw and other materials.
The invention is further configured to: in the step b, positioning and scribing are needed before cutting the graphite block, typesetting and scribing are carried out on the graphite block according to the size of the graphite crucible, and positioning is facilitated during cutting by marking lines on the surface of the graphite block.
Through adopting above-mentioned technical scheme, fix a position when the graphite piece cutting through typesetting the marking off, can improve the precision of graphite piece cutting to improve the machining precision of graphite piece.
The invention is further configured to: when graphite is positioned and scribed, the arrangement is reasonable, the number of graphite crucibles cut by massive graphite blocks is increased as much as possible, and cutting waste is reduced.
Through adopting above-mentioned technical scheme, through reasonable arrangement, can reduce the production of cutting waste material to reduce the waste to raw and other materials.
The invention is further configured to: and in the step b, cutting the graphite block by a band sawing machine when cutting.
The invention is further configured to: in the step c, the feeding depth of the primary processing cutter is slightly smaller than the opening depth of the groove.
Through adopting above-mentioned technical scheme, the later stage of being convenient for is polished the processing to the bottom of recess, prevents to be greater than the design depth because of the degree of depth that polishing processing leads to the recess.
The invention is further configured to: in the step c, the outer diameter of the primary processing cutter is slightly smaller than the diameter of the groove of the graphite crucible.
Through adopting above-mentioned technical scheme, the later stage of being convenient for is polished the processing to the lateral wall of recess, prevents to be greater than because of polishing the lateral wall diameter that leads to the recess and relate to the size.
The invention is further configured to: and step g, putting the processed graphite crucible into a sintering furnace, raising the temperature to 150-350 ℃ for 10 hours, then raising the temperature to 400-450 ℃ for 15 hours, then raising the temperature to 500-550 ℃ for 20 hours, then raising the temperature to 600-700 ℃ for 15 hours, and finally raising the temperature to 800-1000 ℃ for 10 hours.
By adopting the technical scheme, the phenomenon that the graphite crucible is cracked due to large rising amplitude of the heating temperature is prevented by gradually increasing the temperature.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. selecting a graphite block; b. cutting; c. preliminary processing of a groove; d. cutting off waste materials; e. polishing the side wall of the groove; g. the steps of heat treatment and the like are carried out, and the primary processing cutter and the cutting cutter are processed twice, so that the generated waste material is cylindrical graphite blocks which can be reused in the production process of the graphite crucible, and raw materials are greatly saved;
2. according to the invention, by controlling the outer diameter and the feeding depth of the primary processing cutter, the bottom and the side wall of the groove can be conveniently polished in the later period, and the situation that the size of the outer wall of the groove and the opening depth of the groove exceed the design values due to polishing is prevented.
Drawings
FIG. 1 is an isometric view of a roughing tool of an embodiment;
fig. 2 is an isometric view of the cutting tool of an embodiment.
In the figure: 1. primarily processing a cutter; 2. cutting off the cutter; 21. a cutter body; 22. fixing the rod; 23. the teeth are cut off.
Detailed Description
The first embodiment is as follows: a graphite crucible processing technology comprises the following steps:
a. selecting graphite blocks: selecting graphite blocks which use graphite powder and medium-temperature coal pitch as raw materials for processing the graphite blocks, wherein the mass percent of the graphite powder in the graphite powder and the medium-temperature coal pitch is 90%, the mass percent of the medium-temperature coal pitch is 10%, and the graphite blocks are not subjected to sintering treatment;
b. positioning and scribing: typesetting and scribing are carried out on the graphite block according to the size of the graphite crucible, and positioning is facilitated during cutting by marking a marking line on the surface of the graphite block; the reasonable arrangement is needed when the typesetting is carried out, the number of the graphite crucibles cut by the massive graphite blocks is increased as much as possible, and the generation of cutting waste materials is reduced;
c. cutting: when the graphite block is cut, the graphite block is cut by a band sawing machine, and in the cutting process of the band sawing machine, a band saw of the band sawing machine is cut along a marked line drawn in advance, so that the cutting accuracy is improved;
d. preliminary processing of a groove: fixing the cut graphite block on a three-jaw chuck of a lathe, and then fixing a primary processing cutter as shown in figure 1 on the lathe, wherein the primary processing cutter is arranged in a cylindrical shape and is provided with openings at two ends, and the outer diameter of the primary processing cutter is slightly smaller than the diameter of a groove of a graphite crucible; the lathe drives the graphite block to rotate through the three-jaw chuck, the primary machining cutter is pushed to move towards the direction close to the graphite block, the graphite block is cut after the primary machining cutter is contacted with the graphite block, then the primary machining cutter is fed continuously, the graphite block is subjected to primary machining through the primary machining cutter, and the feeding depth of the primary machining cutter is slightly smaller than the opening depth of the groove; forming a core column on the graphite block;
e. cutting off waste materials: after the groove is initially machined, the initial machining tool is detached from the lathe, and a cutting tool shown in fig. 2 is mounted, wherein the cutting tool comprises a tool body which is arranged in an arc shape, a fixed rod which is fixedly connected to one end of the tool body and a plurality of cutting teeth which are fixedly connected to the inner side of the arc of the tool body, and the axis of the fixed rod is parallel to the axis of the tool body; the diameter of the outer side of the circular arc of the cutter body is equal to the outer diameter of the primary processing cutter, the sharp teeth of the cutting teeth are positioned on one side of the cutting teeth, which is away from the cutter body, and the cutting teeth are uniformly distributed on the inner side of the cutter body along the circular arc direction; the cutter body extends into the groove which is finished by preliminary processing, and sharp teeth of the cutting teeth are contacted with the periphery of the core column; inserting the cutter body and the cutting teeth into the groove through a feeding cutting cutter, wherein the feeding depth of the cutter body is equal to that of a primary processing cutter, then rotating the fixing rod to enable the cutter body and the cutting teeth to move towards the direction close to the axis of the core column, cutting the core column through the cutting teeth until the core column is cut off, and then taking down the core column from the graphite block;
f. polishing the side wall of the groove: polishing the side wall of the groove by a grinding machine, polishing the side wall of the groove to a specified size, and improving the smoothness of the side wall of the groove by polishing by the grinding machine;
g. polishing the bottom of the groove: polishing one side of the bottom of the groove by a grinding machine to a specified depth, and improving the smoothness of the bottom of the groove by polishing by the grinding machine;
h. and (3) heat treatment: and (2) putting the machined graphite crucible into a sintering furnace for heat treatment, putting the machined graphite crucible into the sintering furnace, firstly raising the temperature to 150 ℃ for 10 hours, then raising the temperature to 400 ℃ for 15 hours, then raising the temperature to 500 ℃ for 20 hours, then raising the temperature to 600 ℃ for 15 hours, and finally raising the temperature to 800 ℃ for 10 hours.
Example two: a graphite crucible processing technology comprises the following steps:
a. selecting graphite blocks: selecting graphite blocks which use graphite powder and medium-temperature coal pitch as raw materials for processing the graphite blocks, wherein the mass percent of the graphite powder in the graphite powder and the medium-temperature coal pitch is 80 percent, the mass percent of the medium-temperature coal pitch is 20 percent, and the graphite blocks are not subjected to sintering treatment;
b. positioning and scribing: typesetting and scribing are carried out on the graphite block according to the size of the graphite crucible, and positioning is facilitated during cutting by marking a marking line on the surface of the graphite block; the reasonable arrangement is needed when the typesetting is carried out, the number of the graphite crucibles cut by the massive graphite blocks is increased as much as possible, and the generation of cutting waste materials is reduced;
c. cutting: when the graphite block is cut, the graphite block is cut by a band sawing machine, and in the cutting process of the band sawing machine, a band saw of the band sawing machine is cut along a marked line drawn in advance, so that the cutting accuracy is improved;
d. preliminary processing of a groove: fixing the cut graphite block on a three-jaw chuck of a lathe, and then fixing a primary processing cutter as shown in figure 1 on the lathe, wherein the primary processing cutter is arranged in a cylindrical shape and is provided with openings at two ends, and the outer diameter of the primary processing cutter is slightly smaller than the diameter of a groove of a graphite crucible; the lathe drives the graphite block to rotate through the three-jaw chuck, the primary machining cutter is pushed to move towards the direction close to the graphite block, the graphite block is cut after the primary machining cutter is contacted with the graphite block, then the primary machining cutter is fed continuously, the graphite block is subjected to primary machining through the primary machining cutter, and the feeding depth of the primary machining cutter is slightly smaller than the opening depth of the groove; forming a core column on the graphite block;
e. cutting off waste materials: after the groove is initially machined, the initial machining tool is detached from the lathe, and a cutting tool shown in fig. 2 is mounted, wherein the cutting tool comprises a tool body which is arranged in an arc shape, a fixed rod which is fixedly connected to one end of the tool body and a plurality of cutting teeth which are fixedly connected to the inner side of the arc of the tool body, and the axis of the fixed rod is parallel to the axis of the tool body; the diameter of the outer side of the circular arc of the cutter body is equal to the outer diameter of the primary processing cutter, the sharp teeth of the cutting teeth are positioned on one side of the cutting teeth, which is away from the cutter body, and the cutting teeth are uniformly distributed on the inner side of the cutter body along the circular arc direction; the cutter body extends into the groove which is finished by preliminary processing, and sharp teeth of the cutting teeth are contacted with the periphery of the core column; inserting the cutter body and the cutting teeth into the groove through a feeding cutting cutter, wherein the feeding depth of the cutter body is equal to that of a primary processing cutter, then rotating the fixing rod to enable the cutter body and the cutting teeth to move towards the direction close to the axis of the core column, cutting the core column through the cutting teeth until the core column is cut off, and then taking down the core column from the graphite block;
f. polishing the side wall of the groove: polishing the side wall of the groove by a grinding machine, polishing the side wall of the groove to a specified size, and improving the smoothness of the side wall of the groove by polishing by the grinding machine;
g. polishing the bottom of the groove: polishing one side of the bottom of the groove by a grinding machine to a specified depth, and improving the smoothness of the bottom of the groove by polishing by the grinding machine;
h. and (3) heat treatment: and (2) putting the machined graphite crucible into a sintering furnace for heat treatment, putting the machined graphite crucible into the sintering furnace, firstly raising the temperature to 250 ℃ for 10 hours, then raising the temperature to 425 ℃ for 15 hours, then raising the temperature to 525 ℃ for 20 hours, then raising the temperature to 650 ℃ for 15 hours, and finally raising the temperature to 900 ℃ for 10 hours.
Example three: a graphite crucible processing technology comprises the following steps:
a. selecting graphite blocks: selecting graphite blocks which use graphite powder and medium-temperature coal pitch as raw materials for processing the graphite blocks, wherein the mass percent of the graphite powder in the graphite powder and the medium-temperature coal pitch is 70 percent, the mass percent of the medium-temperature coal pitch is 30 percent, and the graphite blocks are not subjected to sintering treatment;
b. positioning and scribing: typesetting and scribing are carried out on the graphite block according to the size of the graphite crucible, and positioning is facilitated during cutting by marking a marking line on the surface of the graphite block; the reasonable arrangement is needed when the typesetting is carried out, the number of the graphite crucibles cut by the massive graphite blocks is increased as much as possible, and the generation of cutting waste materials is reduced;
c. cutting: when the graphite block is cut, the graphite block is mostly cut by a band sawing machine, and in the cutting process of the band sawing machine, a band saw of the band sawing machine is enabled to cut along a marked line drawn in advance, so that the cutting accuracy is improved;
d. preliminary processing of a groove: fixing the cut graphite block on a three-jaw chuck of a lathe, and then fixing a primary processing cutter as shown in figure 1 on the lathe, wherein the primary processing cutter is arranged in a cylindrical shape and is provided with openings at two ends, and the outer diameter of the primary processing cutter is slightly smaller than the diameter of a groove of a graphite crucible; the lathe drives the graphite block to rotate through the three-jaw chuck, the primary machining cutter is pushed to move towards the direction close to the graphite block, the graphite block is cut after the primary machining cutter is contacted with the graphite block, then the primary machining cutter is fed continuously, the graphite block is subjected to primary machining through the primary machining cutter, and the feeding depth of the primary machining cutter is slightly smaller than the opening depth of the groove; forming a core column on the graphite block;
e. cutting off waste materials: after the groove is initially machined, the initial machining tool is detached from the lathe, and a cutting tool shown in fig. 2 is mounted, wherein the cutting tool comprises a tool body which is arranged in an arc shape, a fixed rod which is fixedly connected to one end of the tool body and a plurality of cutting teeth which are fixedly connected to the inner side of the arc of the tool body, and the axis of the fixed rod is parallel to the axis of the tool body; the diameter of the outer side of the circular arc of the cutter body is equal to the outer diameter of the primary processing cutter, the sharp teeth of the cutting teeth are positioned on one side of the cutting teeth, which is away from the cutter body, and the cutting teeth are uniformly distributed on the inner side of the cutter body along the circular arc direction; the cutter body extends into the groove which is finished by preliminary processing, and sharp teeth of the cutting teeth are contacted with the periphery of the core column; inserting the cutter body and the cutting teeth into the groove through a feeding cutting cutter, wherein the feeding depth of the cutter body is equal to that of a primary processing cutter, then rotating the fixing rod to enable the cutter body and the cutting teeth to move towards the direction close to the axis of the core column, cutting the core column through the cutting teeth until the core column is cut off, and then taking down the core column from the graphite block;
f. polishing the side wall of the groove: polishing the side wall of the groove by a grinding machine, polishing the side wall of the groove to a specified size, and improving the smoothness of the side wall of the groove by polishing by the grinding machine;
g. polishing the bottom of the groove: polishing one side of the bottom of the groove by a grinding machine to a specified depth, and improving the smoothness of the bottom of the groove by polishing by the grinding machine;
h. and (3) heat treatment: putting the machined graphite crucible into a sintering furnace for heat treatment, putting the machined graphite crucible into the sintering furnace, firstly raising the temperature to 350 ℃ for 10 hours, then raising the temperature to 450 ℃ for 15 hours, then raising the temperature to 550 ℃ for 20 hours, then raising the temperature to 700 ℃ for 15 hours, and finally raising the temperature to 1000 ℃ for 10 hours.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (5)
1. A graphite crucible processing technology is characterized in that: the method comprises the following steps:
a. selecting graphite blocks: selecting graphite blocks which use graphite powder and medium-temperature coal pitch as raw materials for graphite block processing, wherein the mass percent of the graphite powder in the graphite powder and the medium-temperature coal pitch is 70-90%, the mass percent of the medium-temperature coal pitch is 10-30%, and the graphite blocks are not subjected to sintering treatment;
b. cutting: cutting a large graphite block into a plurality of small graphite blocks with the same size as the graphite crucible;
c. preliminary processing of a groove: fixing the cut graphite block on a three-jaw chuck of a lathe, and then fixing a primary processing cutter on the lathe; the pre-processing cutter is arranged in a cylindrical shape, openings are formed in two ends of the pre-processing cutter, the lathe drives the graphite block to rotate through the three-jaw chuck, the pre-processing cutter is pushed to move towards the direction close to the graphite block, the graphite block is cut after the pre-processing cutter is contacted with the graphite block, then the pre-processing cutter is fed continuously, the graphite block is pre-processed through the pre-processing cutter, and a core column is formed on the graphite block; the feeding depth of the primary processing cutter is slightly smaller than the opening depth of the groove; the outer diameter of the primary processing cutter is slightly smaller than the diameter of the groove of the graphite crucible;
d. cutting off waste materials: after the groove is initially machined, the initial machining cutter is detached from the lathe, a cutting cutter is installed, the cutting cutter comprises a cutter body arranged in an arc shape, a fixed rod fixedly connected to one end of the cutter body and a plurality of cutting teeth fixedly connected to the inner side of the arc of the cutter body, and the axis of the fixed rod is parallel to the axis of the cutter body; the diameter of the outer side of the arc of the cutter body is equal to the outer diameter of a primary processing cutter, sharp teeth of the cutting teeth are positioned on one side, away from the cutter body, of the cutting teeth, the cutting teeth are uniformly distributed on the inner side of the cutter body along the arc direction, the cutter body and the cutting teeth are inserted into the groove through feeding the cutting cutter, the feeding depth of the cutter body is equal to the feeding depth of the primary processing cutter, then the fixed rod is rotated, the cutter body and the cutting teeth move towards the direction close to the axis of the core column, the core column is cut through the cutting teeth until the core column is cut off, and then the core column is taken down;
e. polishing the side wall of the groove: polishing the side wall of the groove by a grinding machine, polishing the side wall of the groove to a specified size, and improving the smoothness of the side wall of the groove by polishing by the grinding machine;
f. polishing the bottom of the groove: polishing one side of the bottom of the groove by a grinding machine to a specified depth, and improving the smoothness of the bottom of the groove by polishing by the grinding machine;
g. and (3) heat treatment: and putting the graphite crucible which is machined into a sintering furnace for heat treatment.
2. The graphite crucible processing process as claimed in claim 1, wherein: in the step b, positioning and scribing are needed before cutting the graphite block, typesetting and scribing are carried out on the graphite block according to the size of the graphite crucible, and positioning is facilitated during cutting by marking lines on the surface of the graphite block.
3. The graphite crucible processing process as claimed in claim 2, wherein: when graphite is positioned and scribed, the arrangement is reasonable, the number of graphite crucibles cut by massive graphite blocks is increased as much as possible, and cutting waste is reduced.
4. The graphite crucible processing process as claimed in claim 1, wherein: and in the step b, cutting the graphite block by a band sawing machine when cutting.
5. The graphite crucible processing process as claimed in claim 1, wherein: and step g, putting the processed graphite crucible into a sintering furnace, raising the temperature to 150-350 ℃ for 10 hours, then raising the temperature to 400-450 ℃ for 15 hours, then raising the temperature to 500-550 ℃ for 20 hours, then raising the temperature to 600-700 ℃ for 15 hours, and finally raising the temperature to 800-1000 ℃ for 10 hours.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20130023595A (en) * | 2011-08-29 | 2013-03-08 | (주)세미머티리얼즈 | Bulk cutting device used for graphite crucible fabricating |
| CN202225306U (en) * | 2011-09-26 | 2012-05-23 | 烟台美尔森石墨有限公司 | Graphite sawing device |
| CN103434004B (en) * | 2013-09-05 | 2016-01-20 | 宝丰县五星石墨有限公司 | Knife system drawn by a kind of crucible |
| CN204397562U (en) * | 2014-12-16 | 2015-06-17 | 江西豪安能源科技有限公司 | A kind of graphite crucible polishing refine equipment |
| CN104816388B (en) * | 2015-05-19 | 2016-08-24 | 中国平煤神马集团开封炭素有限公司 | Crucible process tool |
| CN204935925U (en) * | 2015-08-21 | 2016-01-06 | 宁晋昌隆电子材料制造有限公司 | A kind of special purpose lathe for large-sized rock quartz crucible |
| CN205674371U (en) * | 2016-06-17 | 2016-11-09 | 大同新成新材料股份有限公司 | A kind of cutter of processing graphite crucible |
| CN107140984A (en) * | 2017-05-11 | 2017-09-08 | 吉林科工碳业有限公司 | The manufacture method of disposal molding graphite crucible |
| CN207027907U (en) * | 2017-07-12 | 2018-02-23 | 南通利联机床制造有限公司 | Graphite crucible processing lathe |
| CN207629769U (en) * | 2017-09-25 | 2018-07-20 | 何军舫 | A kind of boron nitride crucible grinding device |
| CN207874586U (en) * | 2018-01-30 | 2018-09-18 | 青岛三联石墨制品有限公司 | Graphite vertical band sawing machine |
| CN208215050U (en) * | 2018-04-10 | 2018-12-11 | 东海县太阳光新能源有限公司 | Grinding device is used in a kind of production of silica crucible |
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