CN110695337A - Low-pressure casting method for hot pressing disc - Google Patents
Low-pressure casting method for hot pressing disc Download PDFInfo
- Publication number
- CN110695337A CN110695337A CN201810749337.0A CN201810749337A CN110695337A CN 110695337 A CN110695337 A CN 110695337A CN 201810749337 A CN201810749337 A CN 201810749337A CN 110695337 A CN110695337 A CN 110695337A
- Authority
- CN
- China
- Prior art keywords
- die
- pressure
- pouring
- casting
- upper die
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005266 casting Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000007731 hot pressing Methods 0.000 title claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims description 10
- 230000000630 rising effect Effects 0.000 claims description 8
- 239000010425 asbestos Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 229910052895 riebeckite Inorganic materials 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000000314 lubricant Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to the technical field of casting, in particular to a low-pressure casting method for a hot-pressing disc, which comprises the following steps of a, mounting an upper die on a bottom die, wherein the inner surfaces of the upper die and the bottom die are coated with coatings, the thickness of the coatings coated on the inner surfaces of two upper half gate channels of the upper die is increased from 0.06mm at the lower part to 0.3mm at the upper part, the thickness of the coatings coated on the inner surfaces of two upper half gate channels of the upper die is increased from 0.3mm at a connecting end to 0.4mm at a free end, the thickness of the coatings coated on the inner surfaces of the bottom die is increased from 0.4mm at the lower part to 0.6mm at the upper part, and the thickness of the coatings coated on the inner surfaces of two lower. The invention has the advantages that the defects of unstable products, rough appearance finish and the like caused by the prior modeling and casting process are changed, the low-pressure casting process is used after the improvement, the product quality is stable, and the appearance is greatly improved.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a low-pressure casting method of a hot pressing plate.
Background
In the low-pressure casting process of the aluminum casting metal mold, aluminum liquid is injected into the metal mold cavity from bottom to top under the action of counter gravity from lower pressure, the mold filling is stable, the bottom injection end and the ingate simultaneously serve as a feeding head, and the casting is solidified and molded under the action of slightly high pressure. Because the casting is fed under pressure by the bottom pouring gate, the position of the casting far away from the bottom pouring gate is easy to shrink due to the fact that the thick part is formed, or the height of the casting is high, the feeding of the bottom is difficult to reach.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a casting method for overcoming the defects of unstable products and rough appearance finish in the conventional molding casting process.
In order to achieve the above object, the present invention provides a low pressure casting method of a hot platen, comprising the steps of,
a. the upper die is mounted on the bottom die, the inner surfaces of the upper die and the bottom die are coated with coatings, the thickness of the coatings coated on the inner surface of the upper die is increased from 0.06mm at the lower part to 0.3mm at the upper part, the thickness of the coatings coated on the inner surfaces of two upper half sprue channels of the upper die is increased from 0.3mm at the connecting end to 0.4mm at the free end, the thickness of the coatings coated on the inner surface of the bottom die is increased from 0.4mm at the lower part to 0.6mm at the upper part, and the thickness of the coatings coated on the inner surfaces of two lower half sprue channels of the bottom die is increased from 0.6mm at the connecting;
b. heating the upper die to the temperature of 250-350 ℃ and the bottom die to the temperature of 300-350 ℃;
c. locking an upper die and a bottom die to form a casting die, wherein two upper half sprue channels of the upper die and two lower half sprue channels of the bottom die form two corresponding die runners, and demolding lubricants are coated on the outer surfaces of the casting die and the die runners thereof;
d. placing a heat preservation furnace at the corresponding position of the die pouring gate to keep the temperature of the die pouring gate constant at 730 and 750 ℃ for heat preservation;
e. asbestos gaskets for sealing connection are arranged between the pot cover of the pouring system and the night rising pipe, between the liquid rising pipe and the pouring cup, and between the pouring cup and the mould;
f. placing an asbestos plate for sealing between the pot cover and the furnace, and pouring the two mould pouring gates through the pouring basin;
g. the casting mould descends to press the pouring basin;
h. locking the casting mold by the pressing plate;
i. heating to a working temperature;
j. three groups of electric heating tubes are arranged in the outer strengthening area of the die cavity from bottom to top, from the middle to the periphery, and the distance between each electric heating tube and the side wall of the bottom die is 9.8 mm;
k. closing the mold;
1. the liquid raising and mold filling are carried out, the pressure of the liquid raising and mold filling is 0.1-0.09MPa, and the time is 40 s;
m, pressurizing to 0.06-0.12 Mpa;
n, maintaining the pressure, wherein the pressure maintaining pressure is 0.11MPa, and the pressure maintaining time is 250-550 s;
o, releasing pressure until OMPa, wherein the pressure releasing time is 15-20 s;
p, cooling, wherein the cooling solidification time is 200 and 250 s;
opening an upper die;
r, ejecting the upper die and taking out the workpiece;
and s, inspecting the casting.
Preferably, the coating consists of the hangao DAG395 coating and water, and the component ratio is 1: 4-5.
The invention has the advantages that the defects of unstable products, rough appearance finish and the like caused by the prior modeling and casting process are changed, the low-pressure casting process is used after the improvement, the product quality is stable, and the appearance is greatly improved.
Detailed Description
Example 1:
the low-pressure casting method of the hot pressing plate is characterized by comprising the following steps of,
a. the upper die is mounted on the bottom die, the inner surfaces of the upper die and the bottom die are coated with coatings, the thickness of the coatings coated on the inner surface of the upper die is increased from 0.06mm at the lower part to 0.3mm at the upper part, the thickness of the coatings coated on the inner surfaces of two upper half sprue channels of the upper die is increased from 0.3mm at the connecting end to 0.4mm at the free end, the thickness of the coatings coated on the inner surface of the bottom die is increased from 0.4mm at the lower part to 0.6mm at the upper part, and the thickness of the coatings coated on the inner surfaces of two lower half sprue channels of the bottom die is increased from 0.6mm at the connecting;
b. heating the upper die to 280 ℃ and the bottom die to 320 ℃;
c. locking an upper die and a bottom die to form a casting die, wherein two upper half sprue channels of the upper die and two lower half sprue channels of the bottom die form two corresponding die runners, and demolding lubricants are coated on the outer surfaces of the casting die and the die runners thereof;
d. placing a heat preservation furnace at a position corresponding to the position of the pouring gate of the mold, so that the temperature of the pouring gate of the mold is kept constant at 750 ℃ for heat preservation;
e. asbestos gaskets for sealing connection are arranged between the pot cover of the pouring system and the night rising pipe, between the liquid rising pipe and the pouring cup, and between the pouring cup and the mould;
f. placing an asbestos plate for sealing between the pot cover and the furnace, and pouring the two mould pouring gates through the pouring basin;
g. the casting mould descends to press the pouring basin;
h. locking the casting mold by the pressing plate;
i. heating to a working temperature;
j. three groups of electric heating tubes are arranged in the outer strengthening area of the die cavity from bottom to top, from the middle to the periphery, and the distance between each electric heating tube and the side wall of the bottom die is 9.8 mm;
k. closing the mold;
l, raising liquid and filling, wherein the pressure of raising liquid and filling is 0.09MPa, and the time is 40 s;
m, pressurizing to 0.1 Mpa;
n, maintaining the pressure, wherein the pressure maintaining pressure is 0.11MPa, and the pressure maintaining time is 450 s;
o, releasing pressure until OMPa, wherein the pressure releasing time is 15 s;
p, cooling, wherein the cooling solidification time is 250 s;
opening an upper die;
r, ejecting the upper die and taking out the workpiece;
and s, inspecting the casting.
The coating consists of a Hangao DAG395 coating and water, and the component ratio is 1: 5.
while the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, but is capable of numerous equivalents and substitutions, all of which are within the scope of the invention as defined by the appended claims.
Claims (2)
1. The low-pressure casting method of the hot pressing plate is characterized by comprising the following steps of,
a. the upper die is mounted on the bottom die, the inner surfaces of the upper die and the bottom die are coated with coatings, the thickness of the coatings coated on the inner surface of the upper die is increased from 0.06mm at the lower part to 0.3mm at the upper part, the thickness of the coatings coated on the inner surfaces of two upper half sprue channels of the upper die is increased from 0.3mm at the connecting end to 0.4mm at the free end, the thickness of the coatings coated on the inner surface of the bottom die is increased from 0.4mm at the lower part to 0.6mm at the upper part, and the thickness of the coatings coated on the inner surfaces of two lower half sprue channels of the bottom die is increased from 0.6mm at the connecting;
b. heating the upper die to the temperature of 250-350 ℃ and the bottom die to the temperature of 300-350 ℃;
c. locking an upper die and a bottom die to form a casting die, wherein two upper half sprue channels of the upper die and two lower half sprue channels of the bottom die form two corresponding die runners, and demolding lubricants are coated on the outer surfaces of the casting die and the die runners thereof;
d. placing a heat preservation furnace at the corresponding position of the die pouring gate to keep the temperature of the die pouring gate constant at 730 and 750 ℃ for heat preservation;
e. asbestos gaskets for sealing connection are arranged between the pot cover of the pouring system and the night rising pipe, between the liquid rising pipe and the pouring cup, and between the pouring cup and the mould;
f. placing an asbestos plate for sealing between the pot cover and the furnace, and pouring the two mould pouring gates through the pouring basin;
g. the casting mould descends to press the pouring basin;
h. locking the casting mold by the pressing plate;
i. heating to a working temperature;
j. three groups of electric heating tubes are arranged in the outer strengthening area of the die cavity from bottom to top, from the middle to the periphery, and the distance between each electric heating tube and the side wall of the bottom die is 9.8 mm;
k. closing the mold;
l, rising liquid and filling, wherein the pressure of rising liquid and filling is 0.1-0.09MPa, and the time is 40 s;
m, pressurizing to 0.06-0.12 Mpa;
n, maintaining the pressure, wherein the pressure maintaining pressure is 0.11MPa, and the pressure maintaining time is 250-550 s;
o, releasing pressure until OMPa, wherein the pressure releasing time is 15-20 s;
p, cooling, wherein the cooling solidification time is 200 and 250 s;
opening an upper die;
r, ejecting the upper die and taking out the workpiece;
and s, inspecting the casting.
2. The low-pressure casting method of a hot pressing plate according to claim 1, wherein the dope consists of hangao DAG395 dope and water in a composition ratio of 1: 4-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810749337.0A CN110695337A (en) | 2018-07-10 | 2018-07-10 | Low-pressure casting method for hot pressing disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810749337.0A CN110695337A (en) | 2018-07-10 | 2018-07-10 | Low-pressure casting method for hot pressing disc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110695337A true CN110695337A (en) | 2020-01-17 |
Family
ID=69192216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810749337.0A Pending CN110695337A (en) | 2018-07-10 | 2018-07-10 | Low-pressure casting method for hot pressing disc |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110695337A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01237065A (en) * | 1988-03-18 | 1989-09-21 | Honda Motor Co Ltd | Low pressure casting method and casting die |
| JPH11216555A (en) * | 1998-01-28 | 1999-08-10 | Mazda Motor Corp | Low pressure casting |
| CN101274361A (en) * | 2008-05-08 | 2008-10-01 | 南昌航空大学 | Low speed vacuum squeeze casting technology |
| CN102463344A (en) * | 2010-11-10 | 2012-05-23 | 江苏凯特汽车部件有限公司 | Low-pressure cast aluminum-alloy wheel-casting sequential-solidification temperature-field compensating method |
| CN102699312A (en) * | 2012-07-12 | 2012-10-03 | 上海嘉朗实业有限公司 | Low-pressure casting process and mould for aluminium alloy steering knuckle |
| CN108080601A (en) * | 2017-12-31 | 2018-05-29 | 北京航空航天大学 | A kind of low-pressure charging casting machine fills the casting device and casting method of type High Pressure Solidification with low pressure |
-
2018
- 2018-07-10 CN CN201810749337.0A patent/CN110695337A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01237065A (en) * | 1988-03-18 | 1989-09-21 | Honda Motor Co Ltd | Low pressure casting method and casting die |
| JPH11216555A (en) * | 1998-01-28 | 1999-08-10 | Mazda Motor Corp | Low pressure casting |
| CN101274361A (en) * | 2008-05-08 | 2008-10-01 | 南昌航空大学 | Low speed vacuum squeeze casting technology |
| CN102463344A (en) * | 2010-11-10 | 2012-05-23 | 江苏凯特汽车部件有限公司 | Low-pressure cast aluminum-alloy wheel-casting sequential-solidification temperature-field compensating method |
| CN102699312A (en) * | 2012-07-12 | 2012-10-03 | 上海嘉朗实业有限公司 | Low-pressure casting process and mould for aluminium alloy steering knuckle |
| CN108080601A (en) * | 2017-12-31 | 2018-05-29 | 北京航空航天大学 | A kind of low-pressure charging casting machine fills the casting device and casting method of type High Pressure Solidification with low pressure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101274361B (en) | Low speed vacuum squeeze casting technology | |
| CN101269414B (en) | Casting method for large-scale overpressure resistant aluminum housing | |
| CN107538703A (en) | A kind of pan closet lid Shooting Technique of ABS plastic | |
| CN205437048U (en) | Triple offset butterfly valve valve body casting mould | |
| CN105834398A (en) | Liquid forging forming method for welding-neck flange, forming die and forming device | |
| CN103089369B (en) | Diesel engine oil sump and casting technique | |
| CN112387931A (en) | Gravity casting mold of new energy water-cooled motor shell end cover and casting process thereof | |
| CN106623856B (en) | A kind of method and apparatus improving extrusion casint Piston Casting quality | |
| CN208392553U (en) | A kind of vehicular plastic lens barrel injection forming mold | |
| CN208178391U (en) | A kind of aluminium alloy compression casting device | |
| CN106077470A (en) | Compacted ferrum engine cylinder cover pouring technology | |
| CN110695337A (en) | Low-pressure casting method for hot pressing disc | |
| CN111182752B (en) | Radiator case for magnetic suspension train and casting method thereof | |
| CN208392578U (en) | A kind of expansion lumen type Car Door Handle injection mold | |
| CN104741577A (en) | Technology for producing aluminum copper alloy castings through metal-mould low pressure casting | |
| KR20170002592U (en) | Multiple runner die casting mold for heat sink defect reduction | |
| CN215359616U (en) | Prevent that offset initiatively rectifies injection mold | |
| CN102527935A (en) | Precision vacuum-casting method for foaming-mould aluminum casting | |
| CN1203945C (en) | Sand mould vacuum pressure casting technology and equipment | |
| CN205341881U (en) | Aluminum alloy wheel hub middle and low voltage casting mould | |
| CN212792887U (en) | All-metal gravity casting mold for medium-sized thin-wall box-type aluminum castings | |
| CN209504773U (en) | A kind of injection mold of fast cooling shaping | |
| CN210940341U (en) | A mould for producing car lamp decoration | |
| CN107779649A (en) | A kind of preparation method of aluminium bronze composite casting valve plate | |
| CN207448973U (en) | A kind of mould molding device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200117 |
|
| RJ01 | Rejection of invention patent application after publication |