CN107812895B - Salt core pressing die, salt core manufactured by same and method for manufacturing salt core by same - Google Patents
Salt core pressing die, salt core manufactured by same and method for manufacturing salt core by same Download PDFInfo
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- CN107812895B CN107812895B CN201711284112.4A CN201711284112A CN107812895B CN 107812895 B CN107812895 B CN 107812895B CN 201711284112 A CN201711284112 A CN 201711284112A CN 107812895 B CN107812895 B CN 107812895B
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- horizontal groove
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- cavity
- pressing die
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- 150000003839 salts Chemical group 0.000 title claims abstract description 94
- 238000003825 pressing Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052802 copper Inorganic materials 0.000 claims abstract description 14
- 239000010949 copper Substances 0.000 claims abstract description 14
- 210000001503 joint Anatomy 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 238000000748 compression moulding Methods 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/105—Salt cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/06—Core boxes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a salt core pressing die, a salt core manufactured by the salt core pressing die and a method for manufacturing the salt core. The lower pressing die is internally provided with a horizontal groove I, a horizontal groove II and a vertical groove I; the lower pressing die outer die is provided with a horizontal groove III, a horizontal groove IV and a vertical groove II; the horizontal groove I, two vertical grooves I communicated with the horizontal groove I, the horizontal groove III and two vertical grooves II communicated with the horizontal groove III jointly form a first cavity; the horizontal groove II, two vertical grooves I communicated with the horizontal groove II, the horizontal groove IV and two vertical grooves II communicated with the horizontal groove IV jointly form a second cavity; the bottom surface of the upper pressing film is provided with a horizontal groove V and a horizontal groove VI; the horizontal groove V is in butt joint with the first cavity to form a salt core mold cavity I, and the horizontal groove VI is in butt joint with the second cavity to form a salt core mold cavity II; the lower pressing die inner die is provided with a positioning hole communicated with the vertical groove I. The invention can press two salt cores with semicircular structures and thin-wall copper pipes at one time.
Description
Technical Field
The invention relates to the technical field of salt core manufacturing for pistons, in particular to a salt core pressing die, a salt core manufactured by the salt core pressing die and a method for manufacturing the salt core by the salt core pressing die.
Background
The piston is an important core component of the internal combustion engine, and the performance of the piston plays a very important role in the performance of the internal combustion engine. In order to reduce the temperature of the head of the piston and improve the reliability of the piston under the high-temperature reciprocating working condition, part of high-performance engine pistons adopt inner cooling channels with double oil inlet holes and double oil outlet holes, so that engine oil can not be split in the reciprocating working of the piston, the oil inlet quantity is increased, and the cooling efficiency is improved. In the prior art, a salt core with a simple annular revolving body structure exists, however, the salt core can only press one end face shape in the pressing process of a pressing die, the other end shape needs to be finished through subsequent processing, and the thin-wall copper pipe positioning hole required by assembly needs to be processed and molded through a drill carriage, so that the pressing process is quite complex.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a salt core pressing die, a salt core manufactured by the salt core pressing die and a method for manufacturing the salt core.
The invention adopts the technical scheme that:
a salt core pressing die comprises an upper pressing die, a lower pressing die inner die and a lower pressing die outer die;
the top end of the outer wall of the lower die inner die is symmetrically provided with a horizontal groove I and a horizontal groove II which extend along the axial direction of the lower die inner die, the horizontal groove I and the horizontal groove II are nearly semicircular, and two free ends of the horizontal groove I and the horizontal groove II are downwards and transitionally extended to form a vertical groove I;
the top end of the inner wall of the outer die of the lower die is respectively provided with a horizontal groove III and a horizontal groove IV which extend along the axial direction of the outer die, and two free ends of the horizontal groove III and the horizontal groove IV extend downwards in a transitional manner to form a vertical groove II; the horizontal groove III is matched with the horizontal groove I, the horizontal groove IV is matched with the horizontal groove II, and the vertical groove II is matched with the vertical groove I;
the horizontal groove I, two vertical grooves I and III which are communicated with the horizontal groove I and the horizontal groove III and two vertical grooves II which are communicated with the horizontal groove III jointly form a first cavity; the horizontal groove II, two vertical grooves I and IV which are communicated with the horizontal groove II and two vertical grooves II which are communicated with the horizontal groove IV jointly form a second cavity;
the bottom surface of the upper pressing die is also provided with a horizontal groove V corresponding to the first cavity and a horizontal groove VI corresponding to the second cavity respectively; the horizontal groove V is in butt joint with the first cavity to form a salt core cavity I, and the horizontal groove VI is in butt joint with the second cavity to form a salt core cavity II;
and a positioning hole is vertically formed in the outer wall of the lower pressing die inner die below the vertical groove I, and the positioning hole is communicated with the vertical groove I.
Preferably, the top end face of the lower pressing die inner die is provided with a boss I, and four corners of the boss I are provided with notches corresponding to the vertical grooves I; the top end face of the lower die outer die is provided with a boss II corresponding to the boss I, and four corners of the boss II are provided with notches corresponding to the vertical grooves II.
Preferably, the cavity volume ratio of the salt core die cavity I to the salt core die cavity II is 1: (1+0.6).
Preferably, a positioning pin is arranged on the lower pressing die inner die, and an anti-rotation positioning groove matched with the positioning pin is arranged on the lower pressing die outer die.
Preferably, the lower pressing die inner die is also provided with a horizontal vent hole.
Preferably, the upper pressing die is provided with longitudinal ventilation holes.
The salt core manufactured by the salt core pressing die comprises a near semicircular structure, wherein two ends of the near semicircular structure are downwards transited to form a revolving body, the lower end of the revolving body is provided with a thin-wall copper pipe, and the revolving body and the thin-wall copper pipe which are arranged at the two ends of the near semicircular structure and the near semicircular structure are formed by one-step pressing.
A method for manufacturing a salt core from the salt core pressing mold, comprising the following steps:
1) Pressing a salt core integral blank:
(1) the salt core pressing die is installed in place, and the outer die of the lower pressing die and the inner die of the lower pressing die are adjusted to be in good positions, so that the parting line is ensured to be flush;
(2) a thin-wall copper pipe is put into the positioning holes of the inner die of the lower die;
(3) adding prepared salt powder into a first cavity and a second cavity formed by the lower die outer die and the lower die inner die, and then scraping the upper surface by using a scraper;
(4) the upper pressing die is pressed downwards, the pressurizing pressure is 8+/-1 MPa, and the pressure maintaining time is 1S;
(5) and then the upper pressing die moves upwards, and the inner die of the lower pressing die ejects the salt core blank after the upper pressing die is in place.
2) Deburring the salt core blank;
3) Sintering the salt core blank, heating to 650+/-10 ℃, and preserving heat for 2+/-0.5 hours;
4) And placing the sintered salt core into an insulation box at 80-100 ℃ for Wen Daiyong.
Preferably, the salt powder comprises 94.2% of salt material, 5% of ceramic additive and 0.8% of water glass binder according to weight ratio.
Compared with the prior art, the invention has the beneficial effects that:
1. the pressing die adopts a one-die double-cavity symmetrical structure, can press two salt cores with semicircular structures and thin-wall copper pipes at one time, and has high production efficiency; the positioning holes are formed in the pressing die, and the salt core body and the thin-wall copper pipe placed in the positioning holes can be pressed and formed at one time, so that the salt core body does not need to be processed later to form the positioning holes matched with the piston die; in addition, for the salt core blank formed by pressing, the size of a finished product can be achieved without a subsequent turning process, and the height of the salt core can be accurately ensured;
2. the arrangement of the boss I and the boss II can realize the compression ratio compression of the nearly semicircular structure part and the revolving body part of the salt core;
3. the salt core is formed by one-step compression molding, and a positioning hole matched with a piston die is formed without processing in the subsequent assembly process.
Drawings
FIG. 1 is a schematic cross-sectional view of a salt core pressing mold according to the present invention;
FIG. 2 is a schematic view of the structure of the upper die of FIG. 1 according to the present invention;
FIG. 3 is a schematic view of the inner mold of the lower die of FIG. 1 according to the present invention;
FIG. 4 is a schematic view of the structure of the outer mold of the lower die of FIG. 1 according to the present invention;
fig. 5 is a schematic structural view of a salt core.
In the figure: 1. the upper pressing die, 2, the lower pressing die inner die, 3, the lower pressing die outer die, 4, horizontal grooves I, 5, horizontal grooves II, 6, vertical grooves I, 7, horizontal grooves III, 8, horizontal grooves IV, 9, vertical grooves II, 10, a first cavity, 11, a second cavity, 12, horizontal grooves V, 13, horizontal grooves VI, 14, positioning holes, 15, bosses I, 16, notches, 17, bosses II, 18, positioning pins, 19, anti-rotation positioning grooves, 20, vent holes, 21, vent holes, 22, a near semicircular structure, 23, a revolving body, 24 and a thin-wall copper pipe.
Detailed Description
As shown in fig. 1, 2, 3, 4 and 5, a salt core pressing die comprises an upper die 1, a lower die inner die 2 and a lower die outer die 3;
the top end of the outer wall of the lower die inner die 2 is symmetrically provided with a horizontal groove I4 and a horizontal groove II 5 which extend along the axial direction of the lower die inner die, the horizontal groove I4 and the horizontal groove II 5 are nearly semicircular, and two free ends of the horizontal groove I4 and the horizontal groove II 5 are downwards and transitionally extended to form a vertical groove I6;
the top end of the inner wall of the lower die outer die 3 is respectively provided with a horizontal groove III 7 and a horizontal groove IV 8 which extend along the axial direction of the lower die outer die, and two free ends of the horizontal groove III 7 and two free ends of the horizontal groove IV 8 are respectively extended downwards in a transitional manner to form a vertical groove II 9; the horizontal groove III 7 is matched with the horizontal groove I4, the horizontal groove IV 8 is matched with the horizontal groove II 5, and the vertical groove II 9 is matched with the vertical groove I6;
the horizontal groove I4, two vertical grooves I6 communicated with the horizontal groove I4, a horizontal groove III 7 and two vertical grooves II 9 communicated with the horizontal groove III 7 jointly form a first cavity 10; the horizontal groove II 5, two vertical grooves I6 communicated with the horizontal groove II 5, a horizontal groove IV 8 and two vertical grooves II 9 communicated with the horizontal groove IV 8 jointly form a second cavity 11;
the bottom surface of the upper pressing die 1 is also provided with a horizontal groove V12 corresponding to the first cavity 10 and a horizontal groove VI 13 corresponding to the second cavity 11 respectively; the horizontal groove V12 is butted with the first cavity 10 to form a salt core mold cavity I, and the horizontal groove VI 13 is butted with the second cavity 115 to form a salt core mold cavity II;
and a positioning hole 14 is vertically formed in the outer wall of the lower die inner die 1 below the vertical groove I6, and the positioning hole 14 is communicated with the vertical groove I6.
The top end face of the lower pressing die inner die 2 is provided with a boss I15, and four corners of the boss I15 are provided with notches 16 corresponding to the vertical grooves I6; the top end face of the lower die outer die 3 is provided with a boss II 17 corresponding to the boss I15, and four corners of the boss II 17 are provided with notches 16 corresponding to the vertical grooves II 9.
The cavity volume ratio of the salt core die cavity I to the salt core die cavity II is 1: (1+0.6).
The lower die inner die 2 is provided with a locating pin 18, and the lower die outer die 3 is provided with an anti-rotation locating groove 19 matched with the locating pin 18.
The lower die inner die 2 is also provided with a horizontal vent hole 20, and the upper die 1 is provided with a longitudinal vent hole 21.
The salt core manufactured by the salt core pressing die comprises a near semicircular structure 22, wherein two ends of the near semicircular structure 22 are in downward transition to form a revolving body 23, a thin-wall copper pipe 24 is arranged at the lower end of the revolving body 23, and the near semicircular structure 22, the revolving body 23 arranged at two ends of the near semicircular structure 22 and the thin-wall copper pipe 24 are formed by one-time pressing.
A method for manufacturing a salt core from the salt core pressing mold, comprising the following steps:
1) Pressing a salt core integral blank:
(1) the salt core pressing die is installed in place, and the lower die outer die 3 and the lower die inner die 2 are adjusted in position, so that the parting line is ensured to be level;
(2) a thin-wall copper pipe 24 is put into the positioning holes 14 of the lower die inner die 2;
(3) adding prepared salt powder into a first cavity 10 and a second cavity 11 formed by the lower die outer die 3 and the lower die inner die 2, and then scraping the upper surface by using a scraper;
(6) the upper pressing die 1 is pressed downwards, the pressurizing pressure is 8+/-1 MPa, and the pressure maintaining time is 1S;
(7) then the upper die 1 moves upwards, and the lower die inner die 2 ejects the salt core blank after the upper die is in place.
2) Deburring the salt core blank;
3) Sintering the salt core blank, heating to 650+/-10 ℃, and preserving heat for 2+/-0.5 hours;
4) And placing the sintered salt core into an insulation box at 80-100 ℃ for Wen Daiyong.
Wherein, the prepared salt powder comprises 94.2 percent of salt material, 5 percent of ceramic additive and 0.8 percent of water glass binder according to the weight ratio.
Claims (8)
1. A salt core pressing die comprises an upper pressing die, a lower pressing die inner die and a lower pressing die outer die; the method is characterized in that:
the top end of the outer wall of the lower die inner die is symmetrically provided with a horizontal groove I and a horizontal groove II which extend along the axial direction of the lower die inner die, the horizontal groove I and the horizontal groove II are nearly semicircular, and two free ends of the horizontal groove I and the horizontal groove II are downwards and transitionally extended to form a vertical groove I;
the top end of the inner wall of the lower pressing die outer die is provided with a horizontal groove III matched with the horizontal groove I, a horizontal groove IV matched with the horizontal groove II and a vertical groove II matched with the vertical groove I;
the horizontal groove I, two vertical grooves I communicated with the horizontal groove I, the horizontal groove III and two vertical grooves II communicated with the horizontal groove III jointly form a first cavity; the horizontal groove II, two vertical grooves I and IV which are communicated with the horizontal groove II and two vertical grooves II which are communicated with the horizontal groove IV jointly form a second cavity;
the bottom surface of the upper pressing die is also provided with a horizontal groove V corresponding to the first cavity and a horizontal groove VI corresponding to the second cavity respectively; the horizontal groove V is in butt joint with the first cavity to form a salt core cavity I, and the horizontal groove VI is in butt joint with the second cavity to form a salt core cavity II;
a positioning hole is vertically formed in the outer wall of the lower pressing die inner die below the vertical groove I, and the positioning hole is communicated with the vertical groove I;
the top end face of the lower pressing die inner die is provided with a boss I, and four corners of the boss I are provided with notches corresponding to the vertical grooves I; the top end face of the lower die outer die is provided with a boss II corresponding to the boss I, and four corners of the boss II are provided with notches corresponding to the vertical grooves II.
2. A salt core pressing die as defined in claim 1, wherein: the cavity volume ratio of the salt core die cavity I to the salt core die cavity II is 1: (1+0.6).
3. A salt core pressing die as defined in claim 1, wherein: the lower die inner die is provided with a locating pin, and the lower die outer die is provided with an anti-rotation locating groove matched with the locating pin.
4. A salt core pressing die as defined in claim 1, wherein: the lower pressing die inner die is also provided with a horizontal vent hole.
5. A salt core pressing die as defined in claim 1, wherein: the upper pressing die is provided with longitudinal ventilation holes.
6. A salt core manufactured by the salt core pressing mold according to any one of claims 1 to 5, characterized in that: the novel rotary shaft comprises a near-semicircle structure, wherein two ends of the near-semicircle structure are downwards transited to form a rotary body, the lower ends of the rotary body are respectively provided with a thin-wall copper pipe, and the rotary body and the thin-wall copper pipes which are arranged at the two ends of the near-semicircle structure and the near-semicircle structure are formed by one-time compression molding.
7. A method of manufacturing a salt core from the salt core pressing mold according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
1) Pressing a salt core integral blank;
(1) the salt core pressing die is installed in place, and the outer die of the lower pressing die and the inner die of the lower pressing die are adjusted to be in good positions, so that the parting line is ensured to be flush;
(2) a thin-wall copper pipe is put into the positioning holes of the inner die of the lower die;
(3) adding prepared salt powder into a first cavity and a second cavity formed by the lower die outer die and the lower die inner die, and then scraping the upper surface by using a scraper;
the upper pressing die is pressed downwards, the pressurizing pressure is 8+/-1 MPa, and the pressure maintaining time is 1S;
then the upper pressing die moves upwards, and the inner die of the lower pressing die ejects the salt core blank after the upper pressing die is in place;
2) Deburring the salt core blank;
3) Sintering the salt core blank, heating to 650+/-10 ℃, and preserving heat for 2+/-0.5 hours;
4) And placing the sintered salt core into an insulation box at 80-100 ℃ for Wen Daiyong.
8. The method for manufacturing a salt core by using a salt core pressing mold according to claim 7, wherein: the salt powder comprises 94.2% of salt material, 5% of ceramic additive and 0.8% of water glass binder according to the weight ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711284112.4A CN107812895B (en) | 2017-12-07 | 2017-12-07 | Salt core pressing die, salt core manufactured by same and method for manufacturing salt core by same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711284112.4A CN107812895B (en) | 2017-12-07 | 2017-12-07 | Salt core pressing die, salt core manufactured by same and method for manufacturing salt core by same |
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| Publication Number | Publication Date |
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| CN107812895A CN107812895A (en) | 2018-03-20 |
| CN107812895B true CN107812895B (en) | 2023-07-11 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108994262A (en) * | 2018-08-30 | 2018-12-14 | 湖南江滨机器（集团）有限责任公司 | Cooling oil duct salt core sintering method in a kind of aluminum piston |
| CN109570498A (en) * | 2018-11-16 | 2019-04-05 | 滨州渤海活塞有限公司 | A kind of tilting band notch salt core compacting tool set in the same direction and manufacturing process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05318025A (en) * | 1992-05-18 | 1993-12-03 | Unisia Jecs Corp | Manufacture of piston for internal combusion engine |
| KR100685864B1 (en) * | 2005-11-09 | 2007-02-22 | 김희수 | Salt core for forming oil gallery of engine piston |
| CN201677001U (en) * | 2010-03-30 | 2010-12-22 | 山东滨州渤海活塞股份有限公司 | Salt core compacting tool set designed by proportional cavity |
| KR101404441B1 (en) * | 2013-03-15 | 2014-06-13 | 이석기계 (주) | Manufacturing apparatus of core for forming oil gallery of engine piston |
| CN103658545B (en) * | 2013-12-25 | 2015-11-18 | 山东滨州渤海活塞股份有限公司 | A kind of method of cross beam type salt core compacting tool set and manufacture salt core thereof |
| CN106475525B (en) * | 2016-11-02 | 2018-05-04 | 湖南江滨机器（集团）有限责任公司 | A kind of apparatus and method for being used to place salt core on Piston mould |
| CN107262674A (en) * | 2017-07-04 | 2017-10-20 | 湖南江滨机器（集团）有限责任公司 | A kind of salt core pressing mold and salt core, manufacturing method |
| CN207787618U (en) * | 2017-12-07 | 2018-08-31 | 滨州渤海活塞有限公司 | A kind of salt core compacting tool set and its salt core of manufacture |
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Denomination of invention: A salt core pressing mold and its manufactured salt core, as well as a method for manufacturing salt cores thereof Granted publication date: 20230711 Pledgee: Binzhou branch of China CITIC Bank Co.,Ltd. Pledgor: BINZHOU BOHAI PISTON Co.,Ltd. Registration number: Y2024980014544 |