CN104827040A - Sintering method and sintering tooling for molding pressed hard alloy long pipe fitting - Google Patents
Sintering method and sintering tooling for molding pressed hard alloy long pipe fitting Download PDFInfo
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- CN104827040A CN104827040A CN201510226495.4A CN201510226495A CN104827040A CN 104827040 A CN104827040 A CN 104827040A CN 201510226495 A CN201510226495 A CN 201510226495A CN 104827040 A CN104827040 A CN 104827040A
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Abstract
The invention discloses a sintering method and a sintering tooling for a molding pressed hard alloy long pipe fitting. The sintering method comprises the following steps that a, firstly, a hard alloy mixture is loaded into a mold and is subjected to bidirectional pressing through a pressing process; b, each inner liner graphite core is inserted into a corresponding graphite core installing hole of a graphite boat plate; c, a press blank of the hard alloy pipe fitting subjected to molding pressing is arranged on an inner liner product section of the inner liner graphite core in a sleeving way, and then, sintering is carried out through a sintering process; d, after the sintering is completed, the inner liner graphite core is removed, and then, the inner circle of the hard alloy pipe fitting is subjected to sand blasting processing. The hard alloy long pipe fitting is sintered through the sintering tooling provided by the invention, the annular groove part in the middle of the inner liner graphite core can effectively avoid the contraction of the press blank, and the twisting deformation of the product during the sintering is prevented.
Description
Technical field
The invention belongs to carbide alloy manufacturing technology field, be specifically related to a kind of sintering method and sintering frock of mold pressing carbide alloy long pipe fittings.
Background technology
Carbide alloy manufacturing process is primarily of compound preparation, shaping and sintering three part composition.Conventional manufacturing process mainly contains die forming, hydrostatic pressing, extrusion molding and injection molded four kinds.Die forming, due to the friction effects of mould die wall, can decline along pressing direction pressing pressure.Pressing pressure is directly proportional to carbide alloy green density, and the large carbide alloy green density of pressing pressure is large, and pressing pressure little carbide alloy green density is little.Can produce contraction during carbide alloy pressed compact sintering, carbide alloy pressed compact sintering shrinkage coefficient and carbide alloy green density are inversely proportional to, and the large constriction coefficient of green density is little, and the little constriction coefficient of green density is large.The inconsistent shape that can affect carbide alloy pressed compact sintered article of constriction coefficient.The difference of green density and constriction coefficient can be reduced by two-way compacting, but prolong the still large than the little constriction coefficient of the green density of two ends of exerting pressure of middle part.And affect due to the limitation by technology, be difficult to ensure the filling of die forming compound evenly, on the horizontal plane vertical with pressing direction, the green density at each position is also difficult to be consistent, so the contraction of pressed compact be heterogeneity contraction during sintering.
In order to ensure the circularity of sintered article, one is normally adopted to sinter tubulose series hard alloy goods with the sintering finished cylindrical graphite in-core lining requiring internal diameter consistent.For this series products highly higher, the green density of pressed compact middle part and compacting two ends differs greatly, first the little constriction coefficient conference of green density of pressed compact middle part is retracted to the size of cylindrical liner graphite core, and due to green density inconsistent at position each on the horizontal plane vertical with pressing direction, final contraction is that the circle of different by size irregularity carries out, first different 2 contractions of height may fit with liner cylindrical graphite core, this sintered products distortion will be caused to be shrunk to product that axial vertical cross-section is parallelogram, the type quality affecting product controls.Tubulose series hard alloy product has certain market demand, and the sintering abnormal deformation that this liner graphite core causes is the technical issues that need to address in the industry.
Summary of the invention
The object of the invention is to solve the distortion of mold pressing tubulose series hard alloy sintered products and be shrunk to the technical problem that axial vertical cross-section is parallelogram abnormal deformation, there is provided a kind of sintering method of mold pressing carbide alloy long pipe fittings and sintering frock to have eliminate and control this distortion, the type quality of product is effectively ensured.
To achieve these goals, the technical solution used in the present invention is:
A sintering method for mold pressing carbide alloy long pipe fittings, comprises the following steps:
Step a, first loads mould carbide alloy mixture and carries out two-way compacting by pressing process;
Step b, inserts respectively by liner graphite core in the graphite core installing hole of graphite boat plate;
Step c, is enclosed within the pressed compact of the carbide alloy pipe fitting after mold pressing in the liner product section of liner graphite core, is then sintered by sintering process;
Steps d, has sintered rear removal liner graphite core, has then carried out blasting treatment to the inner circle of carbide alloy pipe fitting.
Preferably, in described sintering process, from 1200 DEG C to the heating-up time of sintering temperature be 100 ~ 120 points.
Preferably, described liner graphite core comprises liner product section and boat plate supporting section, and liner product section is cylindrical-shaped structure, the grooving portion that liner product section is formed after comprising middle ring cutting, and is positioned at terminal inner lining portion of grooving portion two; Described graphite boat plate is provided with the graphite core installing hole installing liner graphite core, liner graphite core inserts graphite core installing hole by boat plate supporting section and is installed on graphite boat plate.
Preferably, liner graphite core 1 ~ 4mm longer than carbide alloy pipe fitting.
Preferably, the length of interior shirt portion is 10 ~ 20 ﹪ of carbide alloy tubular length.
Preferably, the ring cutting degree of depth in grooving portion is 1 ~ 3 ﹪ of carbide alloy pipe fitting internal diameter.
Preferably, boat plate supporting section adopts cylindrical-shaped structure, and diameter is 50 ~ 70 ﹪ of carbide alloy pipe fitting internal diameter, length 1mm fewer than the degree of depth of graphite core installing hole; Graphite core installing hole is circular port, aperture 0.3 ~ 0.6mm more than boat plate supporting section diameter.
A sintering frock for mold pressing carbide alloy long pipe fittings, is lining in the liner graphite core in carbide alloy pipe fitting in comprising, and supports the graphite boat plate of carbide alloy pipe fitting and liner graphite core;
Described liner graphite core comprises liner product section and boat plate supporting section, and liner product section is cylindrical-shaped structure, the grooving portion that liner product section is formed after comprising middle ring cutting, and is positioned at terminal inner lining portion of grooving portion two; Described graphite boat plate is provided with the graphite core installing hole installing liner graphite core, liner graphite core inserts graphite core installing hole by boat plate supporting section and is installed on graphite boat plate.
Preferably, liner graphite core 1 ~ 4mm longer than carbide alloy pipe fitting; The length of interior shirt portion is 10 ~ 20 ﹪ of carbide alloy tubular length; The ring cutting degree of depth in grooving portion is 1 ~ 3 ﹪ of carbide alloy pipe fitting internal diameter.
Preferably, boat plate supporting section adopts cylindrical-shaped structure, and diameter is 50 ~ 70 ﹪ of carbide alloy pipe fitting internal diameter, length 1mm fewer than the degree of depth of graphite core installing hole; Graphite core installing hole is circular port, aperture 0.3 ~ 0.6mm more than boat plate supporting section diameter.
Owing to have employed technique scheme, the invention has the beneficial effects as follows:
After the two-way compacting of carbide alloy pipe fitting, two ends green density is higher, and green density is basically identical, circle after sintering shrinkage can be considered standard round, by liner graphite core being divided into the grooving portion of middle ring cutting and being positioned at grooving portion two ends shirt portion, by interior shirt portion, inner liner support is formed to two ends inside the pressed compact of carbide alloy pipe fitting, and in the middle part of pressed compact density comparatively lower shrinkage coefficient is larger, and each position is heterogeneity contraction, the contraction of sintered products effectively can be avoided by grooving portion, make the sintered products after contraction can not torsional deformation, effective control and ensure that the type quality of such sintered products.
Accompanying drawing explanation
Fig. 1 is sintering frock decomposing state figure of the present invention.
Fig. 2 is agglomerant assembling structure schematic diagram of the present invention.
Fig. 3 is sintering frock using state figure of the present invention.
Fig. 4 is sintering frock using state sectional view of the present invention.
Mark in figure: 100-graphite boat plate, 110-graphite core installing hole, 200-carbide alloy pipe fitting, 300-liner graphite core, 310-liner product section, 311, shirt portion in 313-, 312-grooving portion, 320-boat plate supporting section.
Detailed description of the invention
With reference to Fig. 1-4, the sintering frock of mold pressing carbide alloy long pipe fittings of the present invention, is lining in the liner graphite core 300 in carbide alloy pipe fitting 200 in comprising, and supports the graphite boat plate 100 of carbide alloy pipe fitting 200 and liner graphite core 300; Described liner graphite core 300 comprises liner product section 310 and boat plate supporting section 320, and liner product section 310 is cylindrical-shaped structure, the grooving portion 312 that liner product section 310 is formed after comprising middle ring cutting, and is positioned at terminal inner lining portion of 312 liang, grooving portion 311,313; Described graphite boat plate 100 is provided with the graphite core installing hole 110 installing liner graphite core 300, liner graphite core 300 inserts graphite core installing hole 110 by boat plate supporting section 320 and is installed on graphite boat plate 100.
Liner graphite core 300 1 ~ 4mm longer than carbide alloy pipe fitting 200, the length of interior shirt portion 311,313 is 10 ~ 20 ﹪ of carbide alloy pipe fitting 200 length.The ring cutting degree of depth in grooving portion 312 is 1 ~ 3 ﹪ of carbide alloy pipe fitting 200 internal diameter.Boat plate supporting section 320 adopts cylindrical-shaped structure, and diameter is 50 ~ 70 ﹪ of carbide alloy pipe fitting 200 internal diameter, length 1mm fewer than the degree of depth of graphite core installing hole 110; Graphite core installing hole 110 is circular port, aperture 0.3 ~ 0.6mm more than boat plate supporting section 320 diameter.
Each graphite boat plate 100 can arrange multiple graphite core installing hole 110, multiple liner graphite core 300 can be installed simultaneously, disposablely during sintering sinter multiple carbide alloy pipe fitting 200.
The sintering method of mold pressing carbide alloy long pipe fittings, comprises the following steps:
Step a, first loads mould carbide alloy mixture and carries out two-way compacting by pressing process;
Step b, inserts in the graphite core installing hole 110 of graphite boat plate 100 respectively by liner graphite core 300;
Step c, is enclosed within the pressed compact of the carbide alloy pipe fitting 200 after mold pressing in the liner product section 310 of liner graphite core 300, is then sintered by sintering process; In sintering process, from 1200 DEG C to the heating-up time of sintering temperature be 100 ~ 120 points.
Steps d, has sintered rear removal liner graphite core 300, has then carried out blasting treatment to the inner circle of carbide alloy pipe fitting 200.
In the middle part of sintered products, due to green density, comparatively lower shrinkage coefficient is larger, and each position is heterogeneity contraction, the contraction of sintered products effectively can be avoided by grooving portion, make the sintered products after contraction can not torsional deformation, after sintering completes, carry out shaping by blasting treatment, effectively control and ensure that the type quality of such sintered products.
Below in conjunction with specific embodiment, further explaination is done to content of the present invention.
Embodiment 1:
Hard alloy is YG6, and sintering temperature is 1450 DEG C.
The sleeve product length of carbide alloy is 25.6mm, and internal diameter is 15.2mm.
Graphite boat plate 100 thickness is 8mm.
YG6 compound load mould routinely pressing process carry out two-way compacting, processing liner product section 310 height H is 27mm, interior shirt portion 311,313 diameter D is 15.2mm, boat plate supporting section 320 diameter d putting into sintering graphite boat plate 100 is 10mm, height h is the columned liner graphite core 300 of 7mm, then carries out ring cutting to liner product section 310, and part is not cut at two ends, namely in, the length of shirt portion 311,313 is 4mm, and the depth S of grooving is 0.4mm.The through hole that diameter d 1 is 10.3mm opened by sintering graphite boat plate 100, i.e. graphite core installing hole 110.The boat plate supporting section 320 of the liner graphite core 300 processed is inserted on the graphite core installing hole 110 of graphite boat plate 100.Again the pressed compact of carbide alloy pipe fitting 200 good for mold pressing is inserted on the liner graphite core 300 on graphite boat plate 100.Be set as that 100 points sinter in 1200 DEG C to the 1450 DEG C heating-up times of conventional sintering process sintering process.Sinter rear removal graphite core.Blasting treatment is carried out to the inner circle removing graphite core product.Final sintered products does not have torsional deformation, and type quality is guaranteed.
Embodiment 2:
Hard alloy is YN8, and sintering temperature is 1450 DEG C.
The sleeve product length of carbide alloy is 52.0mm, and internal diameter is 27.0mm.
Graphite boat plate 100 thickness is 8mm.
YN8 compound load mould routinely pressing process carry out two-way compacting, processing liner product section 310 height H is 54mm, interior shirt portion 311,313 diameter D is 27.0mm, boat plate supporting section 320 diameter d putting into sintering graphite boat plate 100 is 16mm, height h is the columned liner graphite core 300 of 7mm, then carries out ring cutting to liner product section 310, and part is not cut at two ends, namely in, the length of shirt portion 311,313 is 10mm, and the depth S of grooving is 0.6mm.The through hole that diameter d 1 is 16.4mm opened by sintering graphite boat plate 100, i.e. graphite core installing hole 110.The boat plate supporting section 320 of the liner graphite core 300 processed is inserted on the graphite core installing hole 110 of graphite boat plate 100.Again the pressed compact of carbide alloy pipe fitting 200 good for mold pressing is inserted on the liner graphite core 300 on graphite boat plate 100.Be set as that 110 points sinter in 1200 DEG C to the 1450 DEG C heating-up times of conventional sintering process sintering process.Sinter rear removal graphite core.Blasting treatment is carried out to the inner circle removing graphite core product.Final sintered products does not have torsional deformation, and type quality is guaranteed.
Embodiment 3:
Hard alloy is YG8, and sintering temperature is 1430 DEG C.
The sleeve product length of carbide alloy is 180.0mm, and internal diameter is 112.0mm.
Graphite boat plate 100 thickness is 8mm.
YG8 compound load mould routinely pressing process carry out two-way compacting, processing liner product section 310 height H is 183.0mm, interior shirt portion 311,313 diameter D is 112.0mm, boat plate supporting section 320 diameter d putting into sintering graphite boat plate 100 is 75.0mm, height h is the columned liner graphite core 300 of 7mm, then carries out ring cutting to liner product section 310, and part is not cut at two ends, namely in, the length of shirt portion 311,313 is 20mm, and the depth S of grooving is 1.5mm.The through hole that diameter d 1 is 75.5mm opened by sintering graphite boat plate 100, i.e. graphite core installing hole 110.The boat plate supporting section 320 of the liner graphite core 300 processed is inserted on the graphite core installing hole 110 of graphite boat plate 100.Again the pressed compact of carbide alloy pipe fitting 200 good for mold pressing is inserted on the liner graphite core 300 on graphite boat plate 100.Be set as that 120 points sinter in 1200 DEG C to the 1450 DEG C heating-up times of conventional sintering process sintering process.Sinter rear removal graphite core.Blasting treatment is carried out to the inner circle removing graphite core product.Final sintered products does not have torsional deformation, and type quality is guaranteed.
Claims (10)
1. a sintering method for mold pressing carbide alloy long pipe fittings, is characterized in that, comprises the following steps:
Step a, first loads mould carbide alloy mixture and carries out two-way compacting by pressing process;
Step b, inserts in the graphite core installing hole (110) of graphite boat plate (100) respectively by liner graphite core (300);
Step c, is enclosed within the pressed compact of the carbide alloy pipe fitting (200) after mold pressing in the liner product section (310) of liner graphite core (300), is then sintered by sintering process;
Steps d, has sintered rear removal liner graphite core (300), has then carried out blasting treatment to the inner circle of carbide alloy pipe fitting (200).
2. sintering method according to claim 1, is characterized in that, in described sintering process, from 1200 DEG C to the heating-up time of sintering temperature be 100 ~ 120 points.
3. sintering method according to claim 1, it is characterized in that, described liner graphite core (300) comprises liner product section (310) and boat plate supporting section (320), liner product section (310) is cylindrical-shaped structure, the grooving portion (312) formed after liner product section (310) comprises middle ring cutting, and be positioned at terminal inner lining portion of grooving portion (312) two (311,313); Described graphite boat plate (100) is provided with the graphite core installing hole (110) installing liner graphite core (300), liner graphite core (300) inserts graphite core installing hole (110) by boat plate supporting section (320) and is installed on graphite boat plate (100).
4. the sintering method according to claim 1 or 3, is characterized in that, liner graphite core (300) 1 ~ 4mm longer than carbide alloy pipe fitting (200).
5. sintering method according to claim 3, is characterized in that, the length of interior shirt portion (311,313) is 10 ~ 20 ﹪ of carbide alloy pipe fitting (200) length.
6. sintering method according to claim 3, is characterized in that, the ring cutting degree of depth of grooving portion (312) is 1 ~ 3 ﹪ of carbide alloy pipe fitting (200) internal diameter.
7. sintering method according to claim 3, it is characterized in that, boat plate supporting section (320) adopts cylindrical-shaped structure, and diameter is 50 ~ 70 ﹪ of carbide alloy pipe fitting (200) internal diameter, length 1mm fewer than the degree of depth of graphite core installing hole (110); Graphite core installing hole (110) is circular port, aperture 0.3 ~ 0.6mm more than boat plate supporting section (320) diameter.
8. the sintering frock of a mold pressing carbide alloy long pipe fittings, it is characterized in that: in comprising, be lining in the liner graphite core (300) in carbide alloy pipe fitting (200), and support the graphite boat plate (100) of carbide alloy pipe fitting (200) and liner graphite core (300);
Described liner graphite core (300) comprises liner product section (310) and boat plate supporting section (320), liner product section (310) is cylindrical-shaped structure, the grooving portion (312) formed after liner product section (310) comprises middle ring cutting, and be positioned at terminal inner lining portion of grooving portion (312) two (311,313); Described graphite boat plate (100) is provided with the graphite core installing hole (110) installing liner graphite core (300), liner graphite core (300) inserts graphite core installing hole (110) by boat plate supporting section (320) and is installed on graphite boat plate (100).
9. sintering frock according to claim 8, is characterized in that, liner graphite core (300) 1 ~ 4mm longer than carbide alloy pipe fitting (200); The length of interior shirt portion (311,313) is 10 ~ 20 ﹪ of carbide alloy pipe fitting (200) length; The ring cutting degree of depth in grooving portion (312) is 1 ~ 3 ﹪ of carbide alloy pipe fitting (200) internal diameter.
10. sintering frock according to claim 8, it is characterized in that, boat plate supporting section (320) adopts cylindrical-shaped structure, and diameter is 50 ~ 70 ﹪ of carbide alloy pipe fitting (200) internal diameter, length 1mm fewer than the degree of depth of graphite core installing hole (110); Graphite core installing hole (110) is circular port, aperture 0.3 ~ 0.6mm more than boat plate supporting section (320) diameter.
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| CN201510226495.4A CN104827040B (en) | 2015-05-06 | 2015-05-06 | Sintering method and sintering tooling for molding pressed hard alloy long pipe fitting |
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| CN201510226495.4A CN104827040B (en) | 2015-05-06 | 2015-05-06 | Sintering method and sintering tooling for molding pressed hard alloy long pipe fitting |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109650894A (en) * | 2019-02-15 | 2019-04-19 | 上海华硕精瓷陶瓷股份有限公司 | A kind of preparation method of normal pressure-sintered silicon carbide ceramics part |
| CN109692962A (en) * | 2018-12-29 | 2019-04-30 | 武汉新锐合金工具有限公司 | A kind of hard alloy thin-wall part production technology |
| CN110918986A (en) * | 2019-12-17 | 2020-03-27 | 中国工程物理研究院材料研究所 | Sintering tool clamp for special-model spray pipe products |
| CN115106530A (en) * | 2022-06-28 | 2022-09-27 | 四川一然新材料科技有限公司 | Preparation method of hard alloy special-shaped spray pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115106530A (en) * | 2022-06-28 | 2022-09-27 | 四川一然新材料科技有限公司 | Preparation method of hard alloy special-shaped spray pipe |
| CN115106530B (en) * | 2022-06-28 | 2024-04-12 | 四川一然新材料科技有限公司 | Preparation method of hard alloy special-shaped spray pipe |
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