KR101591895B1 - Casting mold for piston - Google Patents
Casting mold for piston Download PDFInfo
- Publication number
- KR101591895B1 KR101591895B1 KR1020150107965A KR20150107965A KR101591895B1 KR 101591895 B1 KR101591895 B1 KR 101591895B1 KR 1020150107965 A KR1020150107965 A KR 1020150107965A KR 20150107965 A KR20150107965 A KR 20150107965A KR 101591895 B1 KR101591895 B1 KR 101591895B1
- Authority
- KR
- South Korea
- Prior art keywords
- mold
- piston
- molding
- molten metal
- molding space
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
- B22C9/062—Mechanisms for locking or opening moulds
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D25/00—Special casting characterised by the nature of the product
- B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The present invention can improve the productivity of piston casting molding by simultaneous cast molding of two pistons through one mold assembly, facilitate assembly and disassembly of the mold assembly, and provide a machining center, MCT, computer application processing, CNC, A side mold having both side molding space portions for facilitating the taking out of the semi-finished molded article so as to improve the precision of the piston by separating and finishing the piston in the semi-finished product molding using the mold, And a core mold that is assembled to a lower opening of the molding space portion.
In order to achieve the above object, the present invention provides a piston-casting mold forming apparatus comprising a first body and a second body which are assembled together and have a molten metal injection portion, a branch path connected to the molten metal injection portion, A side mold connected to both sides and having both side molding spaces for molding the outer surface of the piston; An upper mold coupled to an upper opening of the molding space to form a head surface of the piston; And a core mold assembled to the lower opening of the molding space to mold the inner cavity of the piston.
Description
The present invention can improve the productivity of piston casting molding by simultaneous cast molding of two pistons through one mold assembly, facilitate assembly and disassembly of the mold assembly, and provide a machining center, MCT, computer application processing, CNC, A side mold having both side molding space portions for facilitating the taking out of the semi-finished molded article so as to improve the precision of the piston by separating and finishing the piston in the semi-finished product molding using the mold, And a core mold that is assembled to a lower opening of the molding space portion.
Generally, an engine is a typical internal combustion engine that obtains power by introducing air and fuel into a combustion chamber and burning it.
A piston which reciprocates at a high speed due to the combustion of fuel is installed inside the cylinder of the engine. The installed piston receives the pressure of the high temperature and high pressure combustion gas generated in the combustion chamber and rotates the crankshaft through the connecting rod.
Such a piston is formed by casting a molten metal such as aluminum by injecting a molten metal into a piston casting mold forming apparatus and naturally solidifying it. The piston is continuously exposed to a harsh environment such as high temperature and high pressure, In addition, it requires the highest precision.
As a conventional technique for casting such a piston, there is disclosed in Japanese Patent Application Laid-Open No. 10-2011-0076740 (issued on Aug. 31, 2011) "piston manufacturing mold of vehicle engine".
The above prior art is composed of an upper mold for molding the head portion of the piston, a core mold for conditioning the space of the lower and lower portions of the piston, and two side molds for molding the cylinder portion of the piston.
However, in general, the mold apparatus according to the prior art is manufactured by processing the mold base of SKD6 type and the lump shape due to the durability problem of the mold,
In order to improve the precision, it is necessary to process the mold by using all the various machining methods such as milling, wire, discharge, grinding, and lapping, and also manual machining and manual line machining must be performed. Therefore, However,
Even if the machining of the mold apparatus is completed, only one piston is cast for each mold apparatus, resulting in a problem that the productivity is lowered.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a mold-
It is possible to improve the productivity of the piston by providing two molding spaces in one side mold and casting two pistons by one injection of the melt,
It is an object of the present invention to provide a piston casting mold forming apparatus capable of improving the precision of a piston by performing various types of grinding using a machining center, MCT, computer application processing, CNC, .
In order to prevent the molten metal from leaking to the outside by firmly holding the side molds of the separated first and second bodies for taking out the semi-finished product, the first and second bodies are pressed And a pressurizing means for pressurizing the casting mold.
In order to achieve the above object, a piston-casting mold forming apparatus according to the present invention comprises:
Wherein the first body and the second body are combined to form a molten metal injection portion, a branch passage connected to the molten metal injection portion, and a side surface formed with both side molding space portions connected to both sides of the branch passage to form the outer surface of the piston mold;
An upper mold coupled to an upper opening of the molding space to form a head surface of the piston; And
And a core mold assembled to a lower opening of the molding space to mold an inner cavity of the piston.
The piston casting mold forming apparatus according to the present invention comprises:
And pressing means for holding the first body and the second body in a combined state,
The pressing means
A first connecting piece coupled to a side surface of the second body, a second connecting piece coupled to a side surface of the second body,
And a coil spring having opposite ends connected to the first connection piece and the second connection piece, respectively, and exerting an elastic force in a direction in which the first and second bodies are assembled.
The piston casting mold forming apparatus according to the present invention comprises:
The mold base can be easily processed and the entire manufacturing time can be shortened by dividing, machining and assembling one mold assembly into a plurality of molds,
There is provided an effect that the productivity of the piston can be improved by forming two molding spaces in one side mold and casting two pistons at the same time by one injection of molten metal,
MCT, computer-aided machining, CNC, lathe, etc., in semi-finished products molded by casting through two molding spaces through the assembly structure of side molds, upper molds and core molds composed of first and second bodies. So that the piston can be precisely machined.
Further, the apparatus for molding a casting mold for a piston according to the present invention has the effect of preventing the molten metal from leaking to the outside by firmly holding the side molds in a combined state.
1 is an assembled sectional view of a piston-casting mold forming apparatus according to the present invention;
2 is an exploded perspective view of a side mold according to the present invention.
3 is a front view of a semi-finished molded article molded by a piston-casting die molding apparatus according to the present invention.
4 is a plan view for explaining the pressing means of the piston-casting die molding apparatus according to the present invention.
While the present invention has been described in connection with certain embodiments, it is obvious that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.
In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.
In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.
It is to be understood that the first to second aspects described in the present specification are merely referred to in order to distinguish between different components and are not limited to the order in which they are manufactured, It may not match.
In describing the piston-casting die molding apparatus according to the present invention, when a rigid approximate direction reference is specified with reference to FIG. 1 for convenience, the upper, lower, left, and right directions are determined in the direction in which gravity acts, Unless otherwise specified in the description and the claims of the invention relating to the drawings, the directions are specified in accordance with this standard.
Hereinafter, a piston casting mold forming apparatus according to the present invention will be described with reference to the accompanying drawings.
1 which is a sectional view of the mold assembly A, Fig. 2 which is a perspective view of the
The mold assembly A is assembled with the
The inner space surrounded by the
The outer surface of the piston is molded by the
The
The upper and
The present invention is characterized in that two pistons are cast and formed in the both side
The
The first and
The molten
That is, the inner surface of the first and
A
The
The reference numerals 15a and 16a denote shaft members that can be formed into a structure in which a coupling hole P1 through which the piston is engaged with the connecting rod is penetrated.
In the present invention, when the molten metal injected into the mold assembly A is naturally solidified, the assembly pressure of the entire mold assembly A, that is, the pressure of the
As shown in FIG. 4, the present invention introduces the pressurizing means 40 for holding the first and
The pressing means (40) of the present invention
A first connecting
And a
It is more preferable that the first and second connecting
The first and
The
That is, the first and second connecting
The reason for introducing the pressing means 40 having the above-
In the case of the coil spring which exerts the elastic force in the compression direction, there is a high possibility that the elastic force is deteriorated due to the extension of the coil spring in the state where the first and
The first and second connecting
At this time, if a
The pressing means 40 of the present invention is a telescopic type in which the
The
The coil springs 43 that are compressed as the distance between the first and second supporting
The
The first and
Therefore, when the tubular bodies of the telescopic
The first and
At this time, the disengagement of the
It is preferable that a separate release button (not shown) is provided for forcing the
It is preferable that the release button is controlled by interlocking with the combination of the first and
The
The upper mold (20)
A mounting
A
And a pressing means (23) provided at one side of the mounting hole (21) for pressing the thermoforming ring (22) toward the molding space portions (15, 16).
The reason why the warming-up
That is, when an upper mold having a completely closed structure is introduced, like a conventional piston-casting mold forming apparatus, gas generated as the molten metal solidifies in the molding space is discharged. In order to prevent the gas from being completely discharged to the outside of the mold assembly There arises a problem that bubble defects occur where holes are formed on the surface of the piston due to gas.
In addition, in order to solve the above-mentioned problems in the conventional piston molding machine, it is necessary to map the air vent structure such as the fine grooves into various shapes in the contact surfaces between the respective molds. And it takes a long processing time.
On the other hand, when the
This is because, when only one molding space portion is provided, the molten metal injection portion formed on the molding space portion functions as a gas discharge passage, so that even if the air vent structure is simply implemented,
Since the two pistons are simultaneously cast using the
In this case, the
That is, the excess forming
In this regard, the content of the excess forming
The reason why the heat-insulating
The pressing means 23 is for preventing the heat-generating
And a fixing
The fixing
The
The
A binding
At this time, depending on the type of the piston, a depressed portion in the form of a female thread may be formed on the head surface. In this case, since the semi-finished product C can not be separated and taken out when the
Next, the
The
The elevating means may be realized by a cam member (not shown) connected to the
Although not shown in the drawings, the cooling passages are formed in the first and
Hereinafter, the casting and molding of a piston using the piston-casting mold forming apparatus having the above-described configuration and the operation and effect of the present invention will be described.
First, the piston-casting mold forming apparatus of the present invention is characterized in that a
In this state, when the first and
Next, the molten metal is injected into the molten
The molten metal injected into the
The molten metal moved to the
When the molten metal is filled up to the predetermined height of the
At this time, the gas contained in the molten metal is discharged to the outside of the mold assembly (A) through the excess forming part (3) due to the structure of the discharge hole (22A)
In this case, a vibrator (not shown) is provided in the opened
When the natural coagulation of the molten metal is completed while the gas is discharged, the operator rotates the fixing
When the cylinder member (not shown) and the elevating means (not shown) of the
At this time, the
Since the
3, the semi-finished product C taken out through the separation of the mold assembly A includes a
The semi-finished molded product (C) taken out is cut (cut) into a connecting portion between the two pistons (P) and the
In the mold-molding of the
In this case, it is generally necessary to perform various machining operations such as machining center, MCT, computational application, CNC, and grinding using a lathe, etc., on the entire surface of the casted piston during casting of the piston. , The grinding time for the cutting part of the excess forming
While the present invention has been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Substitutions should be construed as falling within the scope of protection of the present invention.
P: Piston C: Semifinished product molding
1: gate part 2: runner forming part
2a: Weight loss part 3: Surplus molding part
10:
13: molten metal injection part 14:
14a: comb
20: Upper mold 21: Mounting hole
22: discharge hole 23: pressing means
24: fixed bar 25: nut
26: bolt 27: support bar
28: Connection bar 29:
30: core mold 31: core part
40: pressing means 41, 42: connecting piece
41A, 41B:
41a, 42b: hook groove 43: coil spring
44:
Claims (2)
An upper mold coupled to an upper opening of the molding space to form a head surface of the piston; And
And a core mold assembled to a lower opening of the molding space to form an inner cavity of the piston,
And pressing means for holding a combination of the first body and the second body,
The pressing means
A first connecting piece coupled to a side surface of the second body, a second connecting piece coupled to a side surface of the second body,
And a coil spring having both ends connected to the first connection piece and the second connection piece, respectively, and exerting an elastic force in a direction in which the first and second bodies are assembled.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020150107965A KR101591895B1 (en) | 2015-07-30 | 2015-07-30 | Casting mold for piston |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150107965A KR101591895B1 (en) | 2015-07-30 | 2015-07-30 | Casting mold for piston |
Publications (1)
Publication Number | Publication Date |
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KR101591895B1 true KR101591895B1 (en) | 2016-02-04 |
Family
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Family Applications (1)
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KR1020150107965A KR101591895B1 (en) | 2015-07-30 | 2015-07-30 | Casting mold for piston |
Country Status (1)
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KR (1) | KR101591895B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20210056938A (en) * | 2019-11-11 | 2021-05-20 | 주식회사 우석엔프라 | Strut bearing manufacturing equipment And Strut bearing |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4568088B2 (en) | 2004-11-05 | 2010-10-27 | トヨタ紡織株式会社 | Mold structure, molding method |
-
2015
- 2015-07-30 KR KR1020150107965A patent/KR101591895B1/en active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4568088B2 (en) | 2004-11-05 | 2010-10-27 | トヨタ紡織株式会社 | Mold structure, molding method |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20210056938A (en) * | 2019-11-11 | 2021-05-20 | 주식회사 우석엔프라 | Strut bearing manufacturing equipment And Strut bearing |
KR102407713B1 (en) | 2019-11-11 | 2022-06-10 | 주식회사 우석엔프라 | Strut bearing manufacturing equipment And Strut bearing |
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