CN102407317A - Piston casting mould of engine and casting method of piston casting - Google Patents
Piston casting mould of engine and casting method of piston casting Download PDFInfo
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- CN102407317A CN102407317A CN2011103591828A CN201110359182A CN102407317A CN 102407317 A CN102407317 A CN 102407317A CN 2011103591828 A CN2011103591828 A CN 2011103591828A CN 201110359182 A CN201110359182 A CN 201110359182A CN 102407317 A CN102407317 A CN 102407317A
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Abstract
The invention relates to the field of casting, in particular to a piston casting mould of an engine and a casting method of a piston casting. The casting mould comprise a metal type exterior, pin hole cores, a metal core body and a sand core, wherein the metal core body is provided with an extruded end; the sand core is covered on the extruded end of the metal core body; the sand core and the metal core body form a combined core; the combined core extends in from the top of the metal type exterior; the metal core body is positioned above, and the sand core is positioned below; the two pin hole cores respectively extend in from two sides of the metal type exterior and contact with the sand core; the bottom of the metal type exterior is provided with a sprue; and space surrounded by the metal type exterior, the combined core and the pin hole core is a cavity. The piston casting mould of the engine, which is provided by the invention, is characterized in that the metal core body and the sand core form the combined core, and is suitable for casting with a low-pressure casting method. The metal type exterior is not provided with a direct pouring gate and a dead head, and the technical productive rate of the casting reaches above 82%.
Description
Technical field
The present invention relates to casting field, be specifically related to the casting method of a kind of piston of engine foundry goods casting mold and piston foundry goods.
Background technology
The all-aluminium piston of automobile engine is one of core part of engine, but along with developing of automobile industry, the shape of piston becomes increasingly complex, and causes very big difficulty for the casting mold design and implementation of piston foundry goods.When the automobile engine all-aluminium piston casting mold of design shape complicacy; Usually need be combined into core with the piecemeal core of polylith metal material, adopt traditional gravitation casting method casting, this casting method is owing to need be provided with sprue and rising head; Product yield is not high, causes cost high.
Summary of the invention
The invention provides a kind of piston of engine foundry goods casting mold that is used for.
In addition, the present invention also provides a kind of piston of engine cast casting method of using above-mentioned casting mold.
Use this casting mold to cooperate and to significantly improve product yield with casting method.
In order to achieve the above object, technical scheme of the present invention is achieved in that a kind of casting mold that is used for aforesaid piston of engine cast casting method; Comprise metal mold external form, pin-and-hole core, metallic core and core, wherein metallic core is provided with a protruding end, and core is wrapped in the protruding end of metallic core and forms the combination core with metallic core; The combination core stretches into from the top of metal mold external form; Metallic core is last, and core is following, and the number of pin-and-hole core is two; Stretch into from the both sides of metal mold external form respectively and contact with core, the bottom of metal mold external form is provided with cast gate; The space that is surrounded jointly by metal mold external form, combination core and pin-and-hole core is a die cavity.
Further, in the aforesaid casting mold, the protruding end lateral dimension of said metallic core is less than piston foundry goods seam size, and the thickness of core is not less than 6mm.
Further, in the aforesaid casting mold, the combination core in the step 1 adopts hot box to penetrate the sand method and makes;
Further, in the aforesaid casting mold, the operating temperature that hot box is penetrated hot box in the sand method is 250～350 ℃; Be preferably 250～320 ℃.
Further, in the aforesaid casting mold, it is molding sand that core adopts precoated sand.
The present invention also provides a kind of engine piston cast casting method of using aforementioned casting mold, comprises the steps:
Step 1: exert pressure to alloy liquid, make alloy liquid rise to the cast gate place through stalk;
Step 2: fill type;
Step 3: carry out crystallization;
Step 4: remove pressure, die sinking.
Further, in the aforesaid piston of engine cast casting method, the hydraulic coupling that rises in the step 2 is 0.02～0.025MPa, and rising liquid speed is 50～80mm/s.
Further, in the aforesaid piston of engine cast casting method, the mold filling pressure in the step 3 is 0.03～0.06MPa, and filling time is 10～15s.
Further, in the aforesaid piston of engine cast casting method, the crystallization pressure in the step 4 is 0.04～0.08MPa, and the crystallization dwell time is 15～35s.
Further, in the aforesaid piston of engine cast casting method, the alloy liquid in the step 2 is Al-alloy metal liquid, and temperature is 690～720 ℃.
The present invention gives full play to the characteristic that low pressure casting can utilize stalk to carry out feeding from bottom to up, and sprue and rising head are not set on casting mold, and the product yield of foundry goods reaches 82～88%, and therefore the melting cost can reduce significantly.
In addition, the casting method of piston of engine foundry goods casting mold provided by the present invention and piston foundry goods also has following technique effect:
(1) adopts metallic core and core two parts to constitute the combination core, reduce the difficulty of loosing core, reduce and loose core the time;
(2) partly to adopt precoated sand be raw material to core, has high dimension precision and surface smoothness, can satisfy the requirement of piston foundry goods;
(3) the protruding end size of metallic core is not causing do under the situation of difficult of loosing core big as far as possible, to reduce the weight of core part, practices thrift cost;
(4) the combination core is made with the piston cast casting and has all been used ripe production method, can realize mechanization, automated production, and production efficiency is high;
(5) made full use of the advantage of low-pressure casting method, all-aluminium piston foundry goods dense structure, dimensional accuracy and surface smoothness all improve a lot, the also corresponding raising of production efficiency and product percent of pass.
Description of drawings
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in the specific embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below is embodiments more of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the casting mold master pseudosection of the embodiment of the invention;
Fig. 2 is the casting mold side cutaway view of the embodiment of the invention;
Fig. 3 is the casting method flow chart of the embodiment of the invention.
Reference numeral: 1-metal mold external form, 2-pin-and-hole core, 3-metallic core, 4-core, 5-die cavity, 6-cast gate, 7-protruding end.
The specific embodiment
For making the object of the invention, technical scheme and advantage clearer; To carry out clear, complete description to technical scheme of the present invention below; Based on the specific embodiment among the present invention; Those of ordinary skills are resulting all other embodiments under the prerequisite of not making creative work, the scope that all belongs to the present invention and protected.
A kind of piston of engine foundry goods casting mold comprises metal mold external form, pin-and-hole core, metallic core and core, and wherein metallic core is provided with a protruding end; Core wraps up the protruding end and forms the combination core with metallic core, and the combination core stretches into from the top of metal mold external form, and metallic core is last; Core is following; The number of pin-and-hole core is two, stretches into from the both sides of metal mold external form respectively and contacts with core, and the bottom of metal mold external form is provided with cast gate; The space that is surrounded jointly by metal mold external form, combination core and pin-and-hole core is a die cavity.
The protruding end lateral dimension that can make metallic core during practical implementation is less than piston foundry goods seam size, and the thickness of core is not less than 6mm.
Like this protruding end do not influence loose core and guarantee under the situation of molding sand thickness can be with size design big as far as possible, reduce the volume of core, and then reduce the consumption of molding sand.
When adopting the piecemeal core to carry out low pressure casting; Al-alloy metal liquid can flow into the slit between the piecemeal core and cause the difficulty of loosing core, and when adopting said structure to carry out low pressure casting, because core is an integral body; There is not the slit; And cast casting accomplishes the back core partly to understand nature defeated and dispersed, the step that need loose core successively when having saved use metallic combination core, so production efficiency can increase substantially.
In each embodiment of the present invention, as preferred version, the combination core can use hot box to penetrate the sand method and make.
Hot box is penetrated the method that the sand method is the making combination core of ripe utilization, but mechanization, automated production, production efficiency is high, and preparation method comprises:
1) with hot box box body and metallic core combination, the box body inner cavity size is identical with the requirement of piston core cavity with the roughness requirement, and the gap between box body inner chamber and the metallic core is the space that precoated sand is filled;
2) operating temperature with hot box is adjusted into 250～350 ℃, the numerical value between for example 250 ℃, 270 ℃, 290 ℃, 310 ℃, 330 ℃ or 350 ℃ and wherein any two scopes; Precoated sand is injected the gap until complete filling, promptly form the core that covers the metallic core surface through overcuring afterwards, metallic core forms the combination core with core.
In each embodiment of the present invention, preferred 250～320 ℃ of the operating temperature of hot box, the qualification rate of combination core is higher in this temperature range, and dimensional accuracy and surface roughness are also better.
In each embodiment of the present invention, the preferred employing of the core part precoated sand of combination core is a raw material.
The core that uses precoated sand to make has high dimension precision and surface smoothness; Can satisfy the requirement of piston foundry goods; And do not have the slit, make low-pressure casting method fill type and crystallization process is able to carry out, the size of foundry goods and surface smoothness also can finely guarantee.
The present invention also provides a kind of piston cast casting method of casting mold described in each embodiment of the present invention of using to comprise the steps: in addition
Step 1: exert pressure to alloy liquid; Make alloy liquid rise to the cast gate place through stalk; Alloy liquid can be Al-alloy metal liquid, magnesium alloy molten metal or titanium alloy molten metal in this process; When alloy liquid was Al-alloy metal liquid, temperature was 690～720 ℃, the numerical value between for example 690 ℃, 700 ℃, 710 ℃ or 720 ℃ and wherein any two scopes; Rise hydraulic coupling and remain in 0.02～0.025MPa scope, for example the numerical value between 0.02MPa, 0.022MPa or 0.025MPa and wherein any two scopes; Rising liquid speed is 50～80mm/s, and specifically rising liquid speed, can to rise hydraulic coupling through adjustment definite;
Step 2: pressure is adjusted to 0.03～0.06MPa, for example the numerical value between 0.03MPa, 0.04MPa, 0.05MPa or 0.06MPa and wherein any two scopes; Fill type, filling time is 10～15s; Filling time can be determined that the low more then filling time of mold filling pressure is long more generally speaking by mold filling pressure;
Step 3: pressure is adjusted to 0.04～0.08MPa, for example the numerical value between 0.04MPa, 0.06MPa or 0.08MPa and wherein any two scopes; Carry out the crystallization operation of molten metal, the crystallization dwell time is 15～35s; Crystallization time can be determined that the low more then crystallization time of crystallization pressure is long more generally speaking by crystallization pressure;
Step 4: remove pressure, die sinking.
Because piston crown is thick big and the skirt section wall thickness is very little; Adopt head under pouring position; Be convenient to form the order of solidifying from bottom to top, can give full play to the advantage that low pressure casting utilizes the stalk feeding, and need not to be provided with sprue and rising head; The shape of casting mold is able to simplify, and can significantly improve the product yield of foundry goods.
Through adopting the casting method described in the embodiment of the present invention, all-aluminium piston foundry goods dense structure, dimensional accuracy and surface smoothness are improved than the conventional cast method; The casting of piston foundry goods can realize mechanization, automated production, and production efficiency and product percent of pass are higher.
The present invention provide specific embodiment to describe below for better explaining.
Specific embodiment
Be example with casting 491Q piston foundry goods, as depicted in figs. 1 and 2, the casting mold of 491Q piston foundry goods comprises metal mold external form 1, pin-and-hole core 2, metallic core 3 and core 4; Wherein metallic core 3 is provided with a protruding end 7, and core 4 parcel protruding ends 7 also form the combination cores with metallic core 3, and the combination core stretches into from the top of metal mold external form 1; Metallic core 3 is last; Core 4 is following, and the number of pin-and-hole core 2 is two, stretches into from the both sides of metal mold external form 1 respectively; The top contacts with core 4, and it is parallel with horizontal plane that two pin-and-hole cores 2 are symmetrically distributed in the axis of the left and right sides and pin-and-hole core 2 of core 4; The bottom of metal mold external form 1 is provided with cast gate 6; The space that is surrounded jointly by metal mold external form 1, combination core and pin-and-hole core 2 is a die cavity 5.Protruding end 7 lateral dimensions of metallic core 3 are less than piston foundry goods seam size, and the thickness of core 4 is not less than 6mm.
The hypomere of the protruding end 7 of combination core is that a thickness is that 22mm, radius are the circular arc of 30mm; Epimere is a cuboid that 22mm is thick, 60mm is wide, 12mm is high; Whole protruding end 7 horizontal maximum sizes are 60mm, and under the situation of die cavity 5 shape invariances, the size of lateral dimension less than the seam of piston foundry goods 76mm both satisfied in protruding end 7 like this; Satisfy core 3 thickness again and be not less than 6mm; The 491Q piston foundry goods of under these two preconditions, designing, the manufacturing process of its core 4 parts only consumes precoated sand 30～35g, and cost significantly reduces.
Adopt hot box to penetrate the sand legal system and make the combination core; Hot box is penetrated the Z8615S core shooter of the equipment employing Qingdao starlight foundry machinery Co., Ltd production of sand method; The aluminium alloy castings that core 4 employing Chongqing green ring casting Co., Ltd produces uses precoated sand to be molding sand; The precoated sand model is LFCS12, and granularity is 70～140, and preparation method comprises:
1) with hot box box body and metallic core 3 combinations, the box body inner cavity size is identical with the requirement of piston core cavity with the roughness requirement, and the gap between box body inner chamber and the metallic core 3 is the space that precoated sand is filled;
2) operating temperature with hot box is adjusted into 320 ℃, and precoated sand is injected the gap until complete filling, promptly forms the core 4 that covers metallic core 3 surfaces through overcuring afterwards, and metallic core 3 forms the combination core with core 4.
The casting mold of 491Q piston foundry goods is installed on the J451 air injection machine of Wuxi machine-building Co., Ltd of grand prosperous section production, and cast gate 6 is connected with the stalk of air injection machine.As shown in Figure 3, casting method comprises:
Step 1: exert pressure to Al-alloy metal liquid, make Al-alloy metal liquid rise to cast gate 6 places through stalk, the temperature of Al-alloy metal liquid is 710 ℃ in this process; Rise hydraulic coupling 0.022MPa; Rising liquid speed is 62mm/s;
Step 2: pressure is adjusted to 0.04MPa fill type, filling time is 12s;
Step 3: pressure is adjusted to the crystallization operation that 0.06MPa carries out molten metal, and the crystallization dwell time is 25s;
Step 4: remove pressure, die sinking.
What should explain at last is: above embodiment and embodiment be only in order to explaining technical scheme of the present invention, but not to its restriction; Although the present invention has been carried out detailed explanation with reference to aforementioned embodiments and embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to aforementioned embodiments or technical scheme that embodiment put down in writing, perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the essence disengaging embodiment of the present invention of relevant art scheme or the spirit and the scope of embodiment technical scheme.
Claims (10)
1. piston of engine foundry goods casting mold, it is characterized in that: comprise metal mold external form, pin-and-hole core, metallic core and core, wherein metallic core is provided with a protruding end; Core is wrapped in the protruding end of metallic core and forms the combination core with metallic core, and the combination core stretches into from the top of metal mold external form, and metallic core is last; Core is following; The number of pin-and-hole core is two, stretches into from the both sides of metal mold external form respectively and contacts with core, and the bottom of metal mold external form is provided with cast gate; The space that is surrounded jointly by metal mold external form, combination core and pin-and-hole core is a die cavity.
2. casting mold as claimed in claim 1 is characterized in that: the protruding end lateral dimension of said metallic core is less than piston foundry goods seam size, and the thickness of core is not less than 6mm.
3. according to claim 1 or claim 2 casting mold, it is characterized in that: said combination core adopts hot box to penetrate the sand method and makes.
4. casting mold as claimed in claim 3 is characterized in that: the operating temperature that said hot box is penetrated hot box in the sand method is 250～350 ℃; Be preferably 250～320 ℃.
5. like any described casting mold in the claim 1 to 4, it is characterized in that: it is molding sand that said core adopts precoated sand.
6. an engine piston cast casting method of using any said casting mold in the claim 1 to 5 is characterized in that, comprises the steps:
Step 1: exert pressure to alloy liquid, make alloy liquid rise to the cast gate place through stalk;
Step 2: fill type;
Step 3: carry out crystallization;
Step 4: remove pressure, die sinking.
7. piston of engine cast casting method as claimed in claim 6 is characterized in that: the hydraulic coupling that rises in the said step 2 is 0.02～0.025MPa, and rising liquid speed is 50～80mm/s.
8. like claim 6 or 7 described piston of engine cast casting methods, it is characterized in that: the type operational pressure of filling in the said step 3 is 0.03～0.06MPa, and filling time is 10～15s.
9. like any described piston of engine cast casting method in the claim 6 to 8, it is characterized in that: the crystallization operational pressure in the said step 4 is 0.04～0.08MPa, and the crystallization dwell time is 15～35s.
10. like any described piston of engine cast casting method in the claim 6 to 9, it is characterized in that: the alloy liquid in the said step 2 is Al-alloy metal liquid, and temperature is 690～720 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011103591828A CN102407317A (en) | 2011-11-14 | 2011-11-14 | Piston casting mould of engine and casting method of piston casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103591828A CN102407317A (en) | 2011-11-14 | 2011-11-14 | Piston casting mould of engine and casting method of piston casting |
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| CN102407317A true CN102407317A (en) | 2012-04-11 |
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| CN2011103591828A Pending CN102407317A (en) | 2011-11-14 | 2011-11-14 | Piston casting mould of engine and casting method of piston casting |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102896299A (en) * | 2012-09-28 | 2013-01-30 | 河北科技大学 | Production technology for casting thin-wall cookware through using precoated sand hot box method |
| CN103949491A (en) * | 2014-05-13 | 2014-07-30 | 四川中邦模具有限公司 | Automobile aluminum piston workblank extrusion forming equipment |
| CN105579162A (en) * | 2013-09-27 | 2016-05-11 | 本田金属技术株式会社 | Piston casting method and piston casting device |
| CN105772647A (en) * | 2016-05-25 | 2016-07-20 | 宁波市鄞州德来特技术有限公司 | Device for casting engine cylinder interval water hole and casting technology |
| CN103862001B (en) * | 2012-12-18 | 2018-03-13 | 山东睿科真空科技有限公司 | The rotor machining and dividing plate casting technique of oil-free claw vertical pump |
| CN108705865A (en) * | 2018-07-03 | 2018-10-26 | 广西玉柴机器股份有限公司 | Hollow cylinder block stamp boss and its casting method |
| CN110180999A (en) * | 2019-06-25 | 2019-08-30 | 遵义航天新力精密铸锻有限公司 | A kind of positioning tool and its method for positioning pipe fitting in sand casting coldplate |
| CN117086264A (en) * | 2023-10-19 | 2023-11-21 | 中北大学 | Casting method combining frozen sand mold and gypsum mold |
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Cited By (14)
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| CN102896299A (en) * | 2012-09-28 | 2013-01-30 | 河北科技大学 | Production technology for casting thin-wall cookware through using precoated sand hot box method |
| CN102896299B (en) * | 2012-09-28 | 2016-08-24 | 河北科技大学 | A kind of production technology of film-covering sand hot corebox method casting thin-walled cooker |
| CN103862001B (en) * | 2012-12-18 | 2018-03-13 | 山东睿科真空科技有限公司 | The rotor machining and dividing plate casting technique of oil-free claw vertical pump |
| CN105579162A (en) * | 2013-09-27 | 2016-05-11 | 本田金属技术株式会社 | Piston casting method and piston casting device |
| US9662707B2 (en) | 2013-09-27 | 2017-05-30 | Honda Foundry Co., Ltd. | Piston casting method and piston casting device |
| CN105579162B (en) * | 2013-09-27 | 2017-06-16 | 本田金属技术株式会社 | Method for casting piston and casting for piston device |
| CN103949491A (en) * | 2014-05-13 | 2014-07-30 | 四川中邦模具有限公司 | Automobile aluminum piston workblank extrusion forming equipment |
| CN105772647A (en) * | 2016-05-25 | 2016-07-20 | 宁波市鄞州德来特技术有限公司 | Device for casting engine cylinder interval water hole and casting technology |
| CN108705865A (en) * | 2018-07-03 | 2018-10-26 | 广西玉柴机器股份有限公司 | Hollow cylinder block stamp boss and its casting method |
| CN108705865B (en) * | 2018-07-03 | 2022-08-02 | 广西玉柴机器股份有限公司 | Casting method of hollow cylinder body coding boss |
| CN110180999A (en) * | 2019-06-25 | 2019-08-30 | 遵义航天新力精密铸锻有限公司 | A kind of positioning tool and its method for positioning pipe fitting in sand casting coldplate |
| CN110180999B (en) * | 2019-06-25 | 2020-10-02 | 遵义航天新力精密铸锻有限公司 | Positioning tool and method for positioning pipe fitting in sand casting cooling plate by using same |
| CN117086264A (en) * | 2023-10-19 | 2023-11-21 | 中北大学 | Casting method combining frozen sand mold and gypsum mold |
| CN117086264B (en) * | 2023-10-19 | 2023-12-19 | 中北大学 | Casting method combining frozen sand mold and gypsum mold |
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Application publication date: 20120411 |