CN111331082A - Fixing method of sand core and core rod for fixing sand core - Google Patents
Fixing method of sand core and core rod for fixing sand core Download PDFInfo
- Publication number
- CN111331082A CN111331082A CN201911372123.7A CN201911372123A CN111331082A CN 111331082 A CN111331082 A CN 111331082A CN 201911372123 A CN201911372123 A CN 201911372123A CN 111331082 A CN111331082 A CN 111331082A
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- core
- sand
- exhaust holes
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- 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
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- 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
- B22C9/106—Vented or reinforced cores
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention belongs to the technical field of casting, and particularly relates to a sand core fixing method and a core rod for fixing the sand core, wherein the core rod is pre-embedded at the position of a core head, so that the sand core can be more stably arranged in a membrane shell when being fixed, the phenomenon of core inclination caused by core breakage or unstable positioning is avoided, the thickness of a casting can be effectively ensured to reach a preset size, and meanwhile, in order to avoid influencing exhaust at the position of the core head in the process of increasing the core rod, the core rod is of a tubular structure with a cavity, and exhaust holes are formed in the tube wall of the core rod, so that the problems of air holding and fire choking caused by large air generation amount of the sand core are effectively solved.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a sand core fixing method and a core rod for fixing the sand core.
Background
In the casting process, in order to manufacture an inner cavity of a casting, a sand core needs to be placed in a membrane shell, a core bone used for exhausting and positioning is arranged on the sand core, an exhaust manifold is an important part on an engine, the working environment is severe, the manufacturing process is complex, particularly a complex water-cooling exhaust pipe is provided, as shown in figure 1, the sand core has a double-layer structure, the inner cavity exhausts air, an outer cavity is cooled by water, the casting process has certain difficulty, the water channel has large size, the water cavity core has large weight and large gas generation amount, the number of core heads at the periphery, the upper position and the lower position of the water cavity is small, the size is small, the water cavity core is not well positioned in the pouring process, the air exhaust is not smooth, the wall is thin, the choking and other casting defects occur.
In the prior art, CN108080575B provides a method for fixing a silicon-based ceramic core, and discloses that coarse-grained ceramic powder is filled in a cavity of a large-thickness ceramic core to enhance the high-temperature performance of the core, then ceramic rods bonded with the ceramic core are inserted into two ends of the ceramic core to fix the ceramic core, and the surface of the ceramic rod exposed out of the ceramic core is provided with a free end, and the ceramic rod is used for fixing the ceramic core in a formwork in the subsequent manufacturing process of the formwork.
Therefore, it is required to develop a sand core fixing method having stable supporting strength and smooth exhaust.
Disclosure of Invention
The invention provides a method for fixing a sand core, which aims to solve the problem of large gas generation amount of the core in the prior art.
The sand core fixing method adopts the following technical scheme:
a fixing method of a sand core comprises the steps of sand core manufacturing and sand core assembling, and is characterized in that: in the step of manufacturing the sand core, the upper shell core, the lower shell core and the core arranged between the upper shell core and the lower shell core are manufactured, the core is arranged at the position, used for arranging the core head, on the core, the core is of an integrated structure with the core in a pre-embedded mode, the core is of a tubular structure with a cavity, a plurality of exhaust holes are formed in the pipe wall of the core, and the core is fixed at the positioning position between the upper shell core and the lower shell core in the step of assembling the sand mold.
Further, in the sand core manufacturing step, the core comprises a core main body used for forming a casting inner cavity and a core head used for positioning, the core frame is pre-embedded in the core head and is consistent with the extending direction of the core head, and the core frame is provided with a pre-embedded part pre-embedded in the core head and a supporting part extending out of the core head.
Furthermore, a plurality of rows of exhaust holes are distributed on the core rod and distributed along the extension direction of the core rod, and the exhaust holes in two adjacent rows are distributed in a staggered manner.
Further, the length ratio of the embedded part to the supporting part is (2.5: 1) - (1.5: 1).
Further, the ratio of the diameter of the core print to the diameter of the core rod ranges from (1.5: 1) - (2: 1).
Further, the cross-sectional shape of the core rod is a circular shape.
Further, the wall thickness of the core rod is 1.5mm-3 mm.
Further, the core bar is made of cast iron.
The core rod for fixing the sand core adopts the following technical scheme:
the utility model provides a fixed dabber that uses of psammitolite, includes the dabber body, its characterized in that: the core body is of a tubular structure with a cavity, a plurality of exhaust holes are distributed on the pipe wall of the core, and a plurality of exhaust holes are distributed on the pipe wall of the core body.
Furthermore, a plurality of rows of exhaust holes distributed along the extension direction of the core are distributed on the core body, and the exhaust holes in two adjacent rows are distributed in a staggered manner.
The invention has the beneficial effects that:
the invention provides a method for fixing a sand core, which is characterized in that a core bone is pre-embedded at the position of a core head in the step of making the sand core, so that the sand core can be more stably arranged in a film shell when being fixed, the phenomenon of core inclination caused by core breakage or unstable positioning is avoided, the thickness of a casting can be effectively ensured to reach a preset size, meanwhile, in order to avoid influencing exhaust at the position of the core head in the process of increasing the core bone, the core bone is of a tubular structure with a cavity, and exhaust holes are arranged on the tube wall, so that the problems of gas holding and fire choking caused by large gas generation of the sand core are effectively solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of an embodiment of a water-cooled exhaust manifold made by the sand core fixing method of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic structural view of a shell core of the present invention;
FIG. 4 is a schematic structural view of a core bar for sand core fixation according to the present invention;
reference numerals:
1: a lower shell core; 2: an upper shell core; 3: a water cavity core; 4: a core bone; 5: an airway core; 6: an exhaust hole; 7: a pre-embedding part; 8: a support portion; 9: and (4) core print.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms than those herein described and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention and, therefore, the invention is not to be limited to the embodiments set forth herein.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the sand core fixing method comprises the steps of manufacturing the sand core and assembling the sand core, wherein the step of manufacturing the sand core comprises the steps of manufacturing an upper shell core 2, a lower shell core 1 and a core arranged between the upper shell core and the lower shell core and used for forming a casting cavity, a core frame 4 is arranged at the position on the core, which is used for arranging a core head 9, the core frame 4 and the core form an integrated structure in a pre-embedded mode, the core frame 4 is of a tubular structure with a cavity, a plurality of exhaust holes 6 are formed in the pipe wall of the core frame 4, and the core frame 4 is fixed at a positioning position between the upper shell core 2 and the lower shell core 1 in the step of assembling the sand mold. In the step of sand core making, the core frame 4 is pre-embedded at the position where the core head 9 is arranged, so that the core is more stably arranged in the upper shell core 2 and the lower shell core 1 when the sand core is fixed, the phenomenon of core inclination caused by core breakage or unstable positioning is avoided, the thickness of the casting can be effectively ensured to reach the preset size, and meanwhile, in order to avoid influencing exhaust at the position of the core head 9 in the process of increasing the core frame 4, the core frame 4 is of a tubular structure with a cavity, and the exhaust holes 6 are arranged on the pipe wall, so that the problems of gas building and fire choking caused by large gas generation of the sand core are effectively solved.
In the sand core manufacturing step, the core comprises a core main body used for forming a casting inner cavity and a core head 9 used for positioning, a core rod 4 is pre-embedded in the core head 9 and is consistent with the extending direction of the core head 9, the axes of the core rod 4 and the core head 9 are overlapped, and the core rod 4 is provided with a pre-embedded part 7 pre-embedded in the core head 9 and a supporting part 8 extending out of the core head 9.
In order to uniformly distribute the exhaust holes 6 on the core rod 4, a plurality of rows of exhaust holes 6 distributed along the extending direction of the core rod 4 are distributed on the core rod 4, and the exhaust holes 6 in two adjacent rows are distributed in a staggered manner.
In order to avoid the phenomena of falling off and instability of the core bar 4 in the fixing process, the length ratio of the embedded part 7 to the supporting part 8 is (2.5: 1) - (1.5: 1), and in the embodiment, the length ratio of the embedded part 7 to the supporting part 8 is 2: 1.
In order to more stably embed the core 4 at the position of the core 9, the ratio of the diameter of the core 9 to the diameter of the core 4 ranges from (1.5: 1) - (2: 1), and in the embodiment, the length ratio of the embedded part 7 to the supporting part 8 is 1.8: 1.
In this embodiment, in order to facilitate the processing of the core rod 4, the cross-sectional shape of the core rod 4 is circular, the wall thickness of the core rod 4 is 1.5mm to 3mm, the wall thickness in this embodiment is 2mm, and the core rod 4 is made of cast iron.
In other embodiments of the present invention, the material of the core may be selected from ceramic; the cross-sectional shape may be oval or square; the shape of the vent hole can be oval or triangular; the core frame can be integrally formed with the sand core in the sand core manufacturing step or bonded with the sand core in a high-temperature glue mode, the wall thickness of the core frame can be 1.5mm or 3mm, and the length ratio of the embedded part to the supporting part can be 2.5: 1; the length ratio of the embedded part to the supporting part is 2: 1.
the method for fixing the sand core is suitable for manufacturing various products, such as a water-cooling exhaust manifold. A manufacturing process of a water-cooling exhaust manifold comprises the steps of sand mold manufacturing, molten steel smelting and pouring, wherein in the step of sand mold manufacturing, an upper shell core 2, a lower shell core 1, and a water cavity core 3 and an air channel core 5 which are arranged between the upper shell core and the lower shell core and used for forming a casting cavity are manufactured. The corresponding core shell is provided with mounting grooves for fixing the core heads 9 and the core ribs 4, wherein the water cavity core 3 is provided with the core heads 9 for mounting and positioning, the number of the core heads 9 on the cavity core is small due to structural limitation of the water-cooling exhaust pipe, and the weight and the gas forming amount of the water cavity core 3 are large on the other hand, so that the support strength of the core heads 9 is improved in order to avoid breakage of the core heads 9, the core ribs 4 are embedded in the core heads 9 in the manufacturing process of the water cavity core 3, and the embodiment of the core ribs 4 is the same as the specific implementation mode in the fixing method of the sand core, and is not repeated.
In the embodiment, the number of the core heads 9 and the core bars 4 is 4, the water cavity core 3 is made of high-strength precoated sand, the diameter of each core head 9 is 18mm, the core bars 4 are made of cast iron, and the diameter of each core bar 4 is 10 mm; when the core rod 4 is pre-embedded, the axis of the core rod 4 and the axis of the core head 9 are overlapped.
In this embodiment, through set up core 4 in core 9, can effectively improve core 9's support intensity, the exhaust hole 6 on core 4 surface can increase the area of exhaust outlet, strengthens exhausting, has effectively solved the water cavity and has broken the core, the foundry goods wall is thin, chock the fire problem, and then has improved water-cooling exhaust manifold's yield.
An embodiment of the core rod 4 for sand core fixation of the present invention. As shown in fig. 4, a core rod 4 for fixing a sand core comprises a core rod 4 body, wherein a plurality of exhaust holes 6 are distributed on the tube wall of the core rod 4 body with a cavity and a tubular structure, the tube wall of the core rod 4 body is provided with a plurality of exhaust holes 6, the exhaust holes 6 are arranged to increase the area of an exhaust outlet, and the stable quality of a casting is ensured.
In this embodiment, it has the exhaust hole 6 that the multirow was arranged along the extending direction of core 4 to distribute on the core 4 body, and the exhaust hole 6 staggered distribution of adjacent two rows, exhaust hole 6 evenly distributed can guarantee the stable intensity of core 4 on the core 4 body, avoids appearing fracture, bending phenomenon.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A fixing method of a sand core comprises the steps of sand core manufacturing and sand core assembling, and is characterized in that: in the step of manufacturing the sand core, the upper shell core, the lower shell core and the core arranged between the upper shell core and the lower shell core are manufactured, the core is arranged at the position, used for arranging the core head, on the core, the core is of an integrated structure with the core in a pre-embedded mode, the core is of a tubular structure with a cavity, a plurality of exhaust holes are formed in the pipe wall of the core, and the core is fixed at the positioning position between the upper shell core and the lower shell core in the step of assembling the sand mold.
2. The method of claim 1, further comprising: in the sand core manufacturing step, the core comprises a core main body used for forming a casting inner cavity and a core head used for positioning, the core frame is pre-embedded in the core head and is consistent with the extending direction of the core head, and the core frame is provided with a pre-embedded part pre-embedded in the core head and a supporting part extending out of the core head.
3. The method of claim 2, wherein: and a plurality of rows of exhaust holes distributed along the extension direction of the core are distributed on the core, and the exhaust holes in two adjacent rows are distributed in a staggered manner.
4. A method of setting a sand core as claimed in any one of claims 1 to 3, wherein: the length ratio of the embedded part to the supporting part is (2.5: 1) - (1.5: 1).
5. The method of claim 4, wherein: the ratio of the diameter of the core print to the diameter of the core rod ranges from (1.5: 1) - (2: 1).
6. The method of claim 5, wherein: the cross-sectional shape of the core rod is circular.
7. The method of claim 6, wherein: the wall thickness of the core rod is 1.5mm-3 mm.
8. The method of claim 7, wherein: the core rod is made of cast iron.
9. The utility model provides a fixed dabber that uses of psammitolite, includes the dabber body, its characterized in that: the core body is of a tubular structure with a cavity, a plurality of exhaust holes are distributed on the pipe wall of the core, and a plurality of exhaust holes are distributed on the pipe wall of the core body.
10. The core pin for sand core fixation according to claim 9, wherein: the core body is distributed with a plurality of rows of exhaust holes distributed along the extension direction of the core, and the exhaust holes of two adjacent rows are distributed in a staggered way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911372123.7A CN111331082A (en) | 2019-12-27 | 2019-12-27 | Fixing method of sand core and core rod for fixing sand core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911372123.7A CN111331082A (en) | 2019-12-27 | 2019-12-27 | Fixing method of sand core and core rod for fixing sand core |
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| CN111331082A true CN111331082A (en) | 2020-06-26 |
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| CN201911372123.7A Pending CN111331082A (en) | 2019-12-27 | 2019-12-27 | Fixing method of sand core and core rod for fixing sand core |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112756558A (en) * | 2020-12-18 | 2021-05-07 | 共赢装备制造有限公司 | Novel resin sand core positioning method |
| CN115351227A (en) * | 2022-07-25 | 2022-11-18 | 日月重工股份有限公司 | Casting mold for manufacturing wet exhaust pipe for high-silicon-molybdenum ship and forming method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115351227A (en) * | 2022-07-25 | 2022-11-18 | 日月重工股份有限公司 | Casting mold for manufacturing wet exhaust pipe for high-silicon-molybdenum ship and forming method |
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