CN107282889B - Complex thin-wall mud core in cold core making and forming method thereof - Google Patents
Complex thin-wall mud core in cold core making and forming method thereof Download PDFInfo
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- CN107282889B CN107282889B CN201710302278.8A CN201710302278A CN107282889B CN 107282889 B CN107282889 B CN 107282889B CN 201710302278 A CN201710302278 A CN 201710302278A CN 107282889 B CN107282889 B CN 107282889B
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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
- B22C9/103—Multipart cores
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Abstract
The invention discloses a complex thin-wall mud core in cold core making and a forming method thereof. Designing a special core bar according to the size of the core head of the mud core, wherein the core bar is made by rolling an iron sheet with the thickness of 0.3 mm; uniformly drilling phi 2 holes in the core iron sheet, wherein the length is determined according to the shape and the size of the mud core; installing a steel bar on the cold box die according to the arrangement position of the core bar, so that the die fixing loose piece is used for fixing the special core bar; the invention has the beneficial effects that: the complicated steps in the operation process of the mud core are solved, particularly, the sand tire is not used in the drying process of the sewage sleeve, the labor intensity is reduced, and the production cost is reduced. The strength of the mud core is improved due to the addition of the ventilating core bars.
Description
Technical Field
The invention relates to a complex thin-wall mud core in cold core making, in particular to a complex thin-wall mud core in cold core making and a forming method thereof, belonging to the technical field of metallurgical casting application.
Background
The cylinder cover is a core part on the diesel engine, is one of key parts in the diesel engine, and has high requirement on dimensional precision and strict requirement on wall thickness tolerance; the air passage, the water cavity, the oil passage, the high-pressure oil pipe, the combustion surface and the like are subjected to a water pressure or air pressure test. The requirement on the cleanliness of the inner cavity is high, so that the casting is not allowed to have the casting defects of slag inclusion, sand inclusion, air holes, looseness, cracks and the like which influence the product performance and the water pressure and air pressure tests, and the casting difficulty is very high.
The high dimensional accuracy and the high cleanliness of the inner cavity of the casting are mainly influenced by factors such as a molding method, mold accuracy and the like. The inner cavity of the cylinder cover is formed by mud cores, particularly, the shape of a cooling water cavity is complex, the wall thickness is uneven, the section size is small, under the production condition of a furan resin sand mold, when manual core making is adopted, the size precision of a sand core is difficult to guarantee, meanwhile, in the core making process, a core rod and an air channel are required to be placed in the middle of the mud core, not only is sand filling difficult, but also the compactness is difficult to guarantee, the air channel and the core rod are easily exposed on the surface of the sand core, and the problems that sand sticking, air holes, the core rod cannot be extracted and the like are caused after pouring.
In order to improve the size precision and compactness of the sand core, a cold box of a core shooter is adopted for core making. Although in the traditional process, the water jacket core of the cylinder cover produced by the production line mostly adopts precoated sand hot core making, compared with the hot core box making, the cold core box making has the following advantages:
1) the core making process is quick, and the production efficiency is high;
2) the molding and hardening can be carried out at normal temperature, so that the energy can be saved;
3) the core box is not easy to deform, and the size precision of the sand core is high;
4) the cold core box works at normal temperature, heat capacity does not need to be considered, and the manufacturing cost of the core box can be effectively reduced;
5) the core sand has good fluidity, easy molding and compaction, smooth and clean surface of the core sand, and good collapsibility and deformability;
6) the gas evolution of the core sand is low, which is beneficial to reducing the defect of casting pores.
However, in the actual production process, the strength of the fine section of the complex sand core is very low, the strength is greatly reduced after coating, the vein is serious after casting, and even permeable sand sticking is generated locally. The vein is a common casting defect generated under the condition of making a core by using a cold core box, and is also a fatal weak point influencing the application of the cold core to a complex fine sand core. In order to eliminate the vein defect, the vein removing additive is added in the raw sand, and the vein defect is obviously reduced. But after the additive is added, the strength of the sand core is reduced again, and the quality of the mud core cannot be ensured.
The main problems of the cold core box in the manufacture of the complex thin-wall mud core are as follows:
1) in the core making process, the section size and the core heads of the mud cores are small, the yield of the mud cores is not high, the mud cores are scrapped in batches, and the raw materials and labor are greatly wasted.
2) The small mud core has low strength, and the small parts are broken and cannot be used in the process of using (painting, drying and box matching).
3) In the pouring process, the tiny core head part is easy to deform or break under the action of high-temperature molten iron buoyancy, so that the skin penetration phenomenon is caused.
4) Because the mud core of the lower water jacket is complicated and irregular in shape, and the core bone does not exist inside, the mud core needs to be placed on a special sand tire when being dried after painting, so that the mud core is prevented from being deformed by heating and being scrapped. In the process of cleaning the mud cores by a box, the mud cores are seriously broken due to low strength of the mud cores. The screw hole mud core thin neck part is small in size, the two ends of the screw hole mud core thin neck part are connected with sand mud with larger size, and the mud core is seriously broken in the kiln feeding, drying and box matching processes.
5) In the pouring process, the core head of the mud core with the water jacket is small in size, and no core bone is arranged inside the core head, so that the strength is lower, the mud core is broken and deformed under the action of high-temperature molten iron, so that a cast is scrapped, the core head is lower in strength due to the fact that air is discharged by drilling the core head, meanwhile, when air holes are drilled, the mud core is seriously damaged but does not discharge air, and gas in the mud core cannot be discharged in the pouring process, so that the air-blocking phenomenon is caused, and the cast is scrapped in batches; because the strength of the core head is low, the phenomenon of sand-in-iron caused by molten iron infiltration in the casting process causes difficulty in cleaning. Therefore, the complex thin-wall mud core in cold core making and the forming method thereof are provided aiming at the problems.
Disclosure of Invention
The invention aims to solve the problems, and provides a complex thin-wall mud core in cold core making and a forming method thereof, which increase the strength of the thin-wall mud core in the inner cavity of a complex part, solve the problem of exhaust of the mud core, improve the qualification rate and production efficiency of the mud core and a casting, reduce the production cost, save resources and realize stable production of the complex water cavity mud core.
The invention realizes the purpose through the following technical scheme, and the complex thin-wall mud core in the cold core making comprises a cylinder cover mud core and a lower water jacket mud core arranged at the bottom end of the cylinder cover mud core, wherein a screw hole mud core fixing groove is formed in the side wall of the lower water jacket mud core, and the bottom end of the screw hole mud core fixing groove is connected with the screw hole mud core; a central hole is formed in the center of the mud core of the launching sleeve, and a core head of the launching sleeve is arranged on the outer side of the mud core of the launching sleeve; a second core pipe placing groove is formed in the center of the core head of the lower water sleeve; a first core tube placing groove is formed in the center of the screw hole mud core, and steel bars are arranged in the first core tube placing groove and the second core tube placing groove; one end of the steel bar is connected with a die fixing loose piece; and air outlet holes are formed in the outer sides of the first core tube placing groove and the second core tube placing groove.
Preferably, a plurality of screw hole mud cores are installed on the side wall of the cylinder cover mud core, and the screw hole mud cores are distributed in an array manner.
Preferably, the side wall of the mud core of the lower water jacket is provided with a plurality of core heads of the lower water jacket, and the core heads of the lower water jacket are distributed in a circumferential array manner.
Preferably, a plurality of air outlets are formed in the outer sides of the first core tube placing groove and the second core tube placing groove and distributed in a linear array mode.
A method for forming complex thin-wall mud cores in cold core making comprises the following steps:
a, designing a special core bar according to the size of a mud core print, wherein the core bar is made of a rolled iron sheet with the thickness of 0.3 mm;
b, uniformly drilling phi 2 holes in the core iron sheet, wherein the length is determined according to the shape and the size of the mud core;
c, installing a steel bar on the cold box die according to the arrangement position of the core bars, so that the die fixing loose piece is used for fixing the special core bars;
and D, pouring the cylinder cover.
Preferably, the invention is applied to cold box core making of a core shooter.
The invention has the beneficial effects that:
1) in the core making process, as the air outlet core ribs are added, the strength of the mud core is improved, and the finished product rate of the mud core making is greatly improved from 50 percent to about 98 percent; the complicated steps in the operation process of the mud core are solved, particularly, the sand tire is not used in the drying process of the sewage sleeve, the labor intensity is reduced, and the production cost is reduced.
2) Due to the addition of the ventilating core ribs, the strength of the mud core is improved, the defect that the mud core of the lower water jacket is broken in the pouring process is thoroughly eliminated, the air exhaust of the mud core is smooth in the pouring process, and the defects of air holes in the upper plane are basically overcome.
3) Because the strength of the core head of the mud core is improved, the phenomenon that molten iron permeates into the iron-coated sand during the pouring process is obviously reduced, the problem of difficult cleaning is solved, the qualification rate of the blank of the cylinder cover is improved from about 30 percent of the original qualification rate to about 95 percent of the original qualification rate, the cost is greatly reduced, and the market competitiveness is improved. The core bar is made by rolling an iron sheet with the thickness of 0.3mm, phi 2 air outlet holes are uniformly drilled in the iron sheet, and the length is determined according to the shape and the size of the mud core.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a mud core structure of the launching sleeve of the present invention;
FIG. 3 is a schematic view of the core tube fixing of the present invention;
FIG. 4 is a schematic view of a screw hole mud core structure of the present invention.
In the figure: 1. cylinder cap mud core, 2, lower water jacket mud core, 3, screw mud core, 31, first core pipe standing groove, 32, screw mud core head, 4, centre bore, 5, lower water jacket core head, 51, second core pipe standing groove, 6, screw mud core fixed slot, 7, mould fixed loose piece, 8, rod iron, 9, venthole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-4, the complex thin-wall mud core in the cold core making comprises a cylinder cover mud core 1 and a lower water jacket mud core 2 arranged at the bottom end of the cylinder cover mud core 1, wherein a screw hole mud core fixing groove 6 is formed in the side wall of the lower water jacket mud core 2, and the bottom end of the screw hole mud core fixing groove 6 is connected with a screw hole mud core 3; a central hole 4 is formed in the center of the sewage jacket mud core 2, and a sewage jacket core head 5 is arranged on the outer side of the sewage jacket mud core 2; a second core tube placing groove 51 is formed in the center of the lower water jacket core print 5; a first core tube placing groove 31 is formed in the center of the screw hole mud core 3, and steel bars 8 are arranged in the first core tube placing groove 31 and the second core tube placing groove 51; one end of the steel bar 8 is connected with a die fixing loose piece 7; air outlet holes 9 are formed in the outer sides of the first core tube placing groove 31 and the second core tube placing groove 51.
In the invention, a plurality of screw hole mud cores 3 are arranged on the side wall of the cylinder cover mud core 1, and the screw hole mud cores 3 are distributed in an array form. The side wall of the lower water jacket mud core 2 is provided with a plurality of lower water jacket core heads 5, and the lower water jacket core heads 5 are distributed in a circumferential array mode. The outer sides of the first core tube placing groove 31 and the second core tube placing groove 51 are both provided with a plurality of air outlet holes 9, and the air outlet holes 9 are distributed in a linear array.
The first embodiment is as follows:
the forming method of the complex thin-wall mud core in the cold core making is applied to the production of W cylinder covers and comprises the following steps:
a, designing a special core bar according to the size of a mud core print, wherein the core bar is made of a rolled iron sheet with the thickness of 0.3 mm;
b, uniformly drilling phi 2 holes in the core iron sheet, wherein the length is determined according to the shape and the size of the mud core;
c, installing a steel bar 8 on the cold core box mould according to the arrangement position of the core bones, and enabling the mould fixing movable block 7 to be used for fixing the special core bones;
and D, pouring the W cylinder cover.
Example two:
the method for forming the complex thin-wall mud core in the cold core making is applied to the batch production of the complex box-type castings, and comprises the following steps:
a, designing a special core bar according to the size of a mud core print, wherein the core bar is made of a rolled iron sheet with the thickness of 0.3 mm;
b, uniformly drilling phi 2 holes in the core iron sheet, wherein the length is determined according to the shape and the size of the mud core;
c, installing a steel bar 8 on the cold core box mould according to the arrangement position of the core bones, and enabling the mould fixing movable block 7 to be used for fixing the special core bones;
and D, pouring the box body.
In the core making process, the strength of the mud core is improved due to the addition of the air outlet core ribs, the rate of finished products of the mud core is greatly improved from 50% to about 98%, the percent of pass of blanks of W cylinder covers is improved from about 30% to about 95% at present, powerful conditions are created for batch production of companies, the cost is greatly reduced, the market competitiveness is improved, the rate of finished products of the core is improved from about 50% to 60% to over 95% at present, the phenomenon of waste products caused by difficult cleaning due to the fact that core heads float upwards and form iron-coated sand at the core heads due to breakage does not occur in the pouring process, and good economic benefit and social benefit are obtained.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. The utility model provides a complicated thin wall mud core in cold core system core, includes cylinder cap mud core (1) and sets up the lower water jacket mud core (2) of cylinder cap mud core (1) bottom, its characterized in that: the side wall of the water jacket mud core (2) is provided with a screw hole mud core fixing groove (6), and the bottom end of the screw hole mud core fixing groove (6) is connected with a screw hole mud core (3); a center hole (4) is formed in the center of the lower water jacket mud core (2), and a lower water jacket core head (5) is arranged on the outer side of the lower water jacket mud core (2); a second core tube placing groove (51) is formed in the center of the lower water jacket core head (5); a first core tube placing groove (31) is formed in the center of the screw hole mud core (3), steel bars (8) are installed inside the first core tube placing groove (31) and the second core tube placing groove (51), and air outlet holes (9) are formed in the steel bars (8); one end of the steel bar (8) is connected with a die fixing loose piece (7); and air outlet holes (9) are formed in the outer sides of the first core pipe placing groove (31) and the second core pipe placing groove (51).
2. The cold core-making medium-complex thin-wall mud core of claim 1, wherein: the cylinder cover mud core (1) is provided with a plurality of screw hole mud cores (3) on the side wall, and the screw hole mud cores (3) are distributed in an array manner.
3. The cold core-making medium-complex thin-wall mud core of claim 1, wherein: the side wall of the lower water jacket mud core (2) is provided with a plurality of lower water jacket core heads (5), and the lower water jacket core heads (5) are distributed in a circumferential array manner.
4. The cold core-making medium-complex thin-wall mud core of claim 1, wherein: the outer sides of the first core tube placing groove (31) and the second core tube placing groove (51) are respectively provided with a plurality of air outlet holes (9), and the air outlet holes (9) are distributed in a linear array.
5. The method for forming the complex thin-wall mud cores in the cold core making process according to any one of the claims 1 to 4, is characterized in that: the method comprises the following steps:
a, designing a special core bar according to the size of a mud core print, wherein the core bar is made of a rolled iron sheet with the thickness of 0.3 mm;
b, uniformly drilling phi 2 holes in the core iron sheet, wherein the length is determined according to the shape and the size of the mud core;
c, installing a steel bar (8) on the cold core box mould according to the arrangement position of the core bones, so that the mould fixing loose piece (7) is used for fixing the special core bones;
and D, pouring the cylinder cover.
6. The method for molding the complex thin-wall mud cores in the cold core making process according to claim 5, wherein the method comprises the following steps: the method is applied to the cold box core making of the core shooter.
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| CN201710302278.8A CN107282889B (en) | 2017-05-02 | 2017-05-02 | Complex thin-wall mud core in cold core making and forming method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202151681U (en) * | 2011-07-26 | 2012-02-29 | 东风汽车股份有限公司 | Core head structure of water outlet hole of water channel |
| CN102513507A (en) * | 2011-12-15 | 2012-06-27 | 上海沪临重工有限公司 | Core bar of sand core of steel pipe and manufacturing method of sand core |
| CN103406499A (en) * | 2013-07-15 | 2013-11-27 | 四川宏亚机械有限公司 | Novel fixed valve sand core device |
| CN103752767A (en) * | 2013-12-18 | 2014-04-30 | 桐乡合德机械有限公司 | Shaping structure and manufacturing process of casting elongated hole sand core |
| CN104722716A (en) * | 2015-03-09 | 2015-06-24 | 陕西柴油机重工有限公司 | Forming method of complex thin-wall sand core |
-
2017
- 2017-05-02 CN CN201710302278.8A patent/CN107282889B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202151681U (en) * | 2011-07-26 | 2012-02-29 | 东风汽车股份有限公司 | Core head structure of water outlet hole of water channel |
| CN102513507A (en) * | 2011-12-15 | 2012-06-27 | 上海沪临重工有限公司 | Core bar of sand core of steel pipe and manufacturing method of sand core |
| CN103406499A (en) * | 2013-07-15 | 2013-11-27 | 四川宏亚机械有限公司 | Novel fixed valve sand core device |
| CN103752767A (en) * | 2013-12-18 | 2014-04-30 | 桐乡合德机械有限公司 | Shaping structure and manufacturing process of casting elongated hole sand core |
| CN104722716A (en) * | 2015-03-09 | 2015-06-24 | 陕西柴油机重工有限公司 | Forming method of complex thin-wall sand core |
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