CN112404355A - Casting method of CT machine base steel casting - Google Patents
Casting method of CT machine base steel casting Download PDFInfo
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- CN112404355A CN112404355A CN202011314180.2A CN202011314180A CN112404355A CN 112404355 A CN112404355 A CN 112404355A CN 202011314180 A CN202011314180 A CN 202011314180A CN 112404355 A CN112404355 A CN 112404355A
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- 238000005266 casting Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 15
- 239000010959 steel Substances 0.000 title claims abstract description 15
- 239000004576 sand Substances 0.000 claims abstract description 19
- 239000007849 furan resin Substances 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 6
- 229910052845 zircon Inorganic materials 0.000 claims abstract description 6
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002585 base Substances 0.000 claims description 36
- 238000004519 manufacturing process Methods 0.000 claims description 12
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 238000004321 preservation Methods 0.000 abstract description 12
- 238000000465 moulding Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 230000003031 feeding effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
-
- 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
- B22C9/103—Multipart cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/06—Heating the top discard of ingots
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a casting method of a CT machine base steel casting, which comprises a first sand core, a second sand core, a third sand core, a first external chill, a second external chill, a third external chill, a fourth external chill, a first heat-preservation riser, a second heat-preservation riser, a third heat-preservation riser, a fourth heat-preservation riser, a fifth heat-preservation riser, a first riser patch, a second riser patch, a third riser patch, a fourth riser patch and a pouring gate. The invention adopts furan resin sand for molding, and the zircon powder coating is brushed on the surfaces of the upper mold and the lower mold, thereby effectively ensuring the size and the smooth surface quality of the base casting of the CT machine.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a casting method of a CT machine base steel casting.
Background
The base of the CT machine is a rotary guide rail device for the CT machine, has the main effects of solving the defects that the base of the CT machine in the prior art is fixed, a patient is in one state and has errors easily in treatment, providing a base which can rotate to obtain various body positions, and enabling the patient to be matched with an actual state so as to reduce the errors. This CT machine base is once taken shape by the casting, CT machine base arcwall face and fixed patient's bed phase-match, in the testing process, produce relative rotation between bed and the CT machine base, make the patient present the state of multi-angle, so to require high to CT machine size accuracy control for guaranteeing pivoted angle ability accurate control, and the safety in utilization for guaranteeing the CT machine base has decided CT machine base high quality requirement, consequently, it is crackle-free to the CT machine base requirement, CT machine base inner structure is fine and close to satisfy the radiographic inspection grade requirement, chemical composition and mechanical properties are qualified. At present, the base of the CT machine is cast by adopting ZG275-485 materials. The base of the CT machine is a structure with an arc-shaped surface at the upper part, concave cavities at two sides, upright columns at the lower part and a through hole in the middle. At present, when castings with high requirements on dimensional accuracy such as a base of a CT machine are cast, shapes and sand cores of the castings are all made of furan resin sand, and although the furan resin sand can obtain a high dimensional accuracy grade, due to poor deformability of the furan resin sand, hot cracks are easily generated due to uneven wall thickness of the castings when molten steel is solidified and shrunk, and the qualified rate of the castings is low. Moreover, the CT machine base needs to bear a certain load in use, so the whole CT machine base needs to have better compactness and meet the requirement of radiographic inspection grade, but the conventional casting method is adopted, the CT machine base has the defects of shrinkage porosity, air holes, sand inclusion and the like and is exposed after processing, so the qualification rate of the CT machine base is low, and the manufacturing cost is increased.
Disclosure of Invention
Aiming at the problems, the invention provides a casting method of a CT machine base steel casting, which is used for reducing casting cracks, enabling the internal structure of the casting to be compact and improving the yield of the casting.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the casting method comprises a first sand core, a second sand core, a third sand core, a first external chill, a second external chill, a third external chill, a fourth external chill, a first heat-preservation riser, a second heat-preservation riser, a third heat-preservation riser, a fourth heat-preservation riser, a fifth heat-preservation riser, a first riser patch, a second riser patch, a third riser patch, a fourth riser patch and a pouring gate, and specifically comprises the following steps:
s1, manufacturing a metal mold by taking the central cross section of the concave cavities on the two sides of the base of the CT machine as a parting surface, manufacturing an upper mold and a lower mold by using furan resin sand, and manufacturing a sand core by using alkali phenolic resin sand;
s2, placing the sand cores into a cavity of a lower mold, wherein the first sand core is placed at the position of the middle through hole, the second sand core is placed at the position of the cavity at one side, and the third sand core is placed at the position of the cavity at the other side; first external chillers are respectively placed at the concave cavity part at the bottom of the lower mould, second external chillers are respectively placed at the joint parts of the two ends of the through hole and the cambered surface, third external chillers are respectively placed at the edges of the two sides of the position of the cambered surface of the side surface of the lower mould, and fourth external chillers are placed at the edge of the middle of the position of the cambered surface of the side surface of the lower mould; a first heat-insulating riser is placed at the middle through hole of the upper mould, a second heat-insulating riser and a third heat-insulating riser are correspondingly placed at the two sides of the arc-shaped surface of the upper mould, and a fourth heat-insulating riser and a fifth heat-insulating riser are respectively placed at the upright posts at the two sides of the upper mould;
s3, performing mould assembling after core falling;
s4, smelting the furnace burden, and then pouring a casting;
and S5, after cooling, opening the box and shakeout, and then cleaning the casting to finish the casting work.
Preferably, zircon powder coating is brushed on the surfaces of the upper and lower dies and the sand cores in the step S1.
Preferably, in the step S2, two first outer chills, two second outer chills and two third outer chills are placed, and one fourth outer chiller is placed.
Preferably, in step S2, the lower portion of the first thermal insulation riser corresponds to the first riser patch and the second riser patch, and the lower portions of the fourth thermal insulation riser and the fifth thermal insulation riser correspond to the third riser patch and the fourth riser patch, respectively.
Preferably, in step S2, the gating system is introduced from the runner to the third and fourth feeder patches at the parting plane.
Preferably, the runners particularly include a sprue and a runner.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
the invention relates to a casting method of a CT machine base steel casting, which adopts furan resin sand for molding, and brushes zircon powder coating on the surfaces of an upper mold and a lower mold, thereby effectively ensuring the size and the smooth casting surface quality of the CT machine base casting. According to the invention, the bottom of the arc-shaped surface of the base of the CT machine and the side surface of the arc-shaped surface are respectively provided with the external chills, the first heat-insulating riser, the second heat-insulating riser, the third heat-insulating riser, the fourth heat-insulating riser and the fifth heat-insulating riser are respectively arranged on the middle through hole, the upper part of the arc-shaped surface and the upper parts of the two side upright posts, and the compactness of the whole casting and the exhaust and slag discharge can be effectively ensured through the combined technological measures of the chills and the risers. The pouring system of the invention is led into the third riser patch and the fourth riser patch at the parting surface from the sprue and the cross gate, can ensure the rapid filling of the molten liquid, achieves good feeding effect and can effectively prevent the generation of shrinkage cavity and shrinkage porosity. The invention improves the casting process, reasonably arranges each heat-insulating riser, each riser patch and the external chill, has good surface quality of the casting, compact internal structure of the casting, less defects of sand inclusion, air holes and the like in the casting, meets the requirement of radiographic inspection, improves the finished product rate of the casting and reduces the manufacturing cost.
Drawings
FIG. 1 is a schematic view of a lower front view of the present invention;
FIG. 2 is a schematic view of the bottom side view of the present invention;
FIG. 3 is a schematic view of a bottom plan view of the present invention.
Wherein: the sand core comprises a first sand core-1, a second sand core-2, a third sand core-3, a first external chiller-4, a second external chiller-5, a third external chiller-6, a fourth external chiller-7, a first heat-insulating riser-8, a second heat-insulating riser-9, a third heat-insulating riser-10, a fourth heat-insulating riser-11, a fifth heat-insulating riser-12, a first riser patch-13, a second riser patch-14, a third riser patch-15, a fourth riser patch-16 and a pouring gate-17.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, 2 and 3, the present invention provides a method for casting a CT machine base steel casting, including a first sand core 1, a second sand core 2, a third sand core 3, a first external chill 4, a second external chill 5, a third external chill 6, a fourth external chill 7, a first heat-insulating riser 8, a second heat-insulating riser 9, a third heat-insulating riser 10, a fourth heat-insulating riser 11, a fifth heat-insulating riser 12, a first riser patch 13, a second riser patch 14, a third riser patch 15, a fourth riser patch 16 and a runner 17, the method specifically includes the following steps:
s1, manufacturing a metal mold by taking the central cross section of the concave cavities on the two sides of the base of the CT machine as a parting surface, manufacturing an upper mold and a lower mold by using furan resin sand, manufacturing a sand core by using alkali phenolic resin sand, and brushing zircon powder coating on the surfaces of the upper mold, the lower mold and the sand core;
s2, placing the sand cores into a cavity of a lower mold, wherein the first sand core 1 is placed at the position of the middle through hole, the second sand core 2 is placed at the position of the cavity at one side, and the third sand core 3 is placed at the position of the cavity at the other side; two first external chillers 4 are respectively placed at the concave cavity position at the bottom of the lower mould, two second external chillers 5 are respectively placed at the joint positions of two ends of the through hole and the cambered surface, two third external chillers 6 are respectively placed at the edges of two sides of the position of the cambered surface of the side surface of the lower mould, and a fourth external chill 7 is placed at the edge of the middle of the position of the cambered surface of the side surface of the lower mould; a first heat-insulating riser 8 is placed at the middle through hole of the upper mould, the lower part of the first heat-insulating riser 8 corresponds to a first riser patch 13 and a second riser patch 14, the two sides of the arc-shaped surface of the upper mould correspondingly place a second heat-insulating riser 9 and a third heat-insulating riser 10, the upright post parts at the two sides of the upper mould are respectively placed with a fourth heat-insulating riser 11 and a fifth heat-insulating riser 12, the lower parts of the fourth heat-insulating riser 11 and the fifth heat-insulating riser 12 respectively correspond to a third riser patch 15 and a fourth riser patch 16, a pouring system is led into the third riser patch 15 and the fourth riser patch 16 at the parting surface from a pouring gate 17, and the pouring gate 17 specifically comprises a straight pouring gate and a cross pouring gate;
s3, performing mould assembling after core falling;
s4, smelting the furnace burden, pouring a casting, controlling the pouring temperature at 1550-1570 ℃, adding a covering agent when the molten liquid rises to 1/2-2/3 of the height of the first heat-preservation riser 8, and then slowly pouring to finish pouring when the molten liquid rises to 7/10-4/5 of the first heat-preservation riser 8;
and S5, after cooling, opening the box and shakeout, and then cleaning the casting to finish the casting work.
The invention provides a casting method of a CT machine base steel casting, which adopts furan resin sand for molding, and brushes zircon powder coating on the surfaces of upper and lower sand molds, thereby effectively ensuring the size and the smooth casting surface quality of the CT machine base casting. According to the invention, the bottom of the arc-shaped surface and the side surface of the arc-shaped surface of the base of the CT machine are respectively provided with the external chills, the first heat-insulating riser 8, the second heat-insulating riser 9, the third heat-insulating riser 10, the fourth heat-insulating riser 11 and the fifth heat-insulating riser 12 are respectively arranged on the middle through hole, the upper part of the arc-shaped surface and the upper parts of the upright posts at two sides correspondingly, and the overall compactness and the exhaust and slag discharge of a casting can be effectively ensured through the technological measures of combining the chills and the. The pouring system of the invention is led into the third riser patch 15 and the fourth riser patch 16 at the parting surface from the sprue and the cross gate, can ensure the rapid filling of the molten liquid, achieves good feeding effect and can effectively prevent the generation of shrinkage cavity and shrinkage porosity. The invention improves the casting process, reasonably arranges each heat-insulating riser, each riser patch and the external chill, has good surface quality of the casting, compact internal structure of the casting, less defects of sand inclusion, air holes and the like in the casting, meets the requirement of radiographic inspection, improves the finished product rate of the casting and reduces the manufacturing cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A casting method of a CT machine base steel casting is characterized in that: the casting method comprises a first sand core (1), a second sand core (2), a third sand core (3), a first external chill (4), a second external chill (5), a third external chill (6), a fourth external chill (7), a first heat-insulating riser (8), a second heat-insulating riser (9), a third heat-insulating riser (10), a fourth heat-insulating riser (11), a fifth heat-insulating riser (12), a first riser patch (13), a second riser patch (14), a third riser patch (15), a fourth riser patch (16) and a runner (17), and specifically comprises the following steps:
s1, manufacturing a metal mold by taking the central cross section of the concave cavities on the two sides of the base of the CT machine as a parting surface, manufacturing an upper mold and a lower mold by using furan resin sand, and manufacturing a sand core by using alkali phenolic resin sand;
s2, placing the sand cores into a cavity of a lower mold, wherein the first sand core (1) is placed at the position of the through hole in the middle, the second sand core (2) is placed at the position of the cavity at one side, and the third sand core (3) is placed at the position of the cavity at the other side; first external chillers (4) are respectively placed at the bottom of the lower mould at the concave cavity part, second external chillers (5) are respectively placed at the joint parts of the two ends of the through hole and the cambered surface, third external chillers (6) are respectively placed at the edges of the two sides of the side surface of the lower mould at the cambered surface position, and fourth external chillers (7) are placed at the edge of the middle of the side surface of the lower mould at the cambered surface position; a first heat-insulating riser (8) is arranged at the middle through hole of the upper mould, a second heat-insulating riser (9) and a third heat-insulating riser (10) are correspondingly arranged at the two sides of the arc-shaped surface of the upper mould, and a fourth heat-insulating riser (11) and a fifth heat-insulating riser (12) are respectively arranged at the upright posts at the two sides of the upper mould;
s3, performing mould assembling after core falling;
s4, smelting the furnace burden, and then pouring a casting;
and S5, after cooling, opening the box and shakeout, and then cleaning the casting to finish the casting work.
2. The method for casting the steel casting of the CT machine base as claimed in claim 1, wherein the method comprises the following steps: and step S1, the surfaces of the upper and lower dies and the sand core are brushed with zircon powder coating.
3. The method for casting the steel casting of the CT machine base as claimed in claim 1, wherein the method comprises the following steps: two first outer chills (4), two second outer chills (5) and two third outer chills (6) are placed in the step S2, and one fourth outer chiller (7) is placed.
4. The method for casting the steel casting of the CT machine base as claimed in claim 1, wherein the method comprises the following steps: in the step S2, the lower parts of the first heat-insulating feeder (8) correspond to the first feeder patch (13) and the second feeder patch (14), and the lower parts of the fourth heat-insulating feeder (11) and the fifth heat-insulating feeder (12) correspond to the third feeder patch (15) and the fourth feeder patch (16), respectively.
5. The method for casting the steel casting of the CT machine base as claimed in claim 1, wherein the method comprises the following steps: and in the step S2, the gating system is led into a third riser patch (15) and a fourth riser patch (16) at the parting surface from a pouring gate (17).
6. The method for casting the CT machine base steel casting as claimed in claim 5, wherein the method comprises the following steps: the runner (17) specifically comprises a sprue and a runner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011314180.2A CN112404355A (en) | 2020-11-21 | 2020-11-21 | Casting method of CT machine base steel casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011314180.2A CN112404355A (en) | 2020-11-21 | 2020-11-21 | Casting method of CT machine base steel casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112404355A true CN112404355A (en) | 2021-02-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011314180.2A Pending CN112404355A (en) | 2020-11-21 | 2020-11-21 | Casting method of CT machine base steel casting |
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| Country | Link |
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| CN (1) | CN112404355A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115770858A (en) * | 2022-11-22 | 2023-03-10 | 无锡中叶合金制品有限公司 | CT belt pulley casting molding sand filling device |
-
2020
- 2020-11-21 CN CN202011314180.2A patent/CN112404355A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115770858A (en) * | 2022-11-22 | 2023-03-10 | 无锡中叶合金制品有限公司 | CT belt pulley casting molding sand filling device |
| CN115770858B (en) * | 2022-11-22 | 2023-11-03 | 无锡中叶合金制品有限公司 | CT belt pulley casting sand filling device |
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Application publication date: 20210226 |
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