CN110757113A - Machining process for engine cylinder body mold core - Google Patents
Machining process for engine cylinder body mold core Download PDFInfo
- Publication number
- CN110757113A CN110757113A CN201911214104.1A CN201911214104A CN110757113A CN 110757113 A CN110757113 A CN 110757113A CN 201911214104 A CN201911214104 A CN 201911214104A CN 110757113 A CN110757113 A CN 110757113A
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- Prior art keywords
- mold core
- film layer
- blank
- core blank
- engine cylinder
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- 238000003754 machining Methods 0.000 title claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- 230000003647 oxidation Effects 0.000 claims abstract description 14
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 14
- 238000005498 polishing Methods 0.000 claims abstract description 14
- 150000004767 nitrides Chemical class 0.000 claims abstract description 12
- 238000005516 engineering process Methods 0.000 claims abstract description 10
- 238000005496 tempering Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 6
- 229910001566 austenite Inorganic materials 0.000 abstract description 5
- 229910001563 bainite Inorganic materials 0.000 abstract description 5
- 229910000734 martensite Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a processing technology of a mold core of an engine cylinder body, which comprises the following steps: blanking and obtaining a mold core blank through rough machining, and further carrying out heat treatment and finish machining on the mold core blank to obtain a mold core; wherein the heat treatment comprises: continuously heating the mold core blank to 980-1030 ℃, then cooling the mold core blank to 420-450 ℃ by using oil cooling or air cooling, then air cooling, and tempering the air-cooled mold core blank to ensure that the hardness of the mold core blank is 45-48 HRC; the finishing comprises: and polishing the core blank, and carrying out oxidation or nitridation treatment to form an oxide film layer or a nitride film layer. The heat treatment of the invention converts the microstructure of the mold core into martensite, reduces or avoids carbide, bainite and residual austenite precipitated along the grain boundary, ensures uniform hardness of the mold core, improves the molding and demoulding effects, and has good hardness and strength of the tempered mold core; the oxidation film layer or the nitridation film layer separates the mold core metal from the casting material, so that the phenomenon that the casting material is adhered to the mold is avoided, and the problem that the mold core of the engine cylinder body is easily adhered to the mold is solved.
Description
Technical Field
The invention relates to the technical field of cavity mold production, in particular to a processing technology of a mold core of an engine cylinder body.
Background
In the process of casting the engine cylinder block, because the hardness difference of all parts of the mold core of the existing engine cylinder block is large, and the mold core is easy to be bonded with casting materials, the comprehensive performance of the mold core is poor, the molding and demolding effects are directly influenced, the demolding is not smooth, the friction and scratch and rub of the engine cylinder block are easy to generate, the quality of the engine cylinder block is unstable, the defective rate is high, and the casting cost is increased.
Disclosure of Invention
Based on the above, the invention aims to provide a machining process of a mold core of an engine block.
The invention relates to a processing technology of a mold core of an engine cylinder body, which comprises the following steps:
blanking and carrying out rough machining to obtain a mold core blank, and further carrying out heat treatment and finish machining on the mold core blank to obtain the mold core.
Wherein the heat treatment comprises: continuously heating the mold core blank to 980-1030 ℃, cooling the mold core blank to 420-450 ℃ by using oil cooling or air cooling, then air cooling, and tempering the air-cooled mold core blank to ensure that the hardness of the mold core blank is 45-48 HRC.
The finishing comprises: and polishing the core blank, and carrying out oxidation or nitridation treatment to form an oxide film layer or a nitride film layer.
The mold core blank is subjected to heat treatment and finish machining, the microstructure of the mold core is converted into martensite through the heat treatment, carbides, bainite and residual austenite precipitated along a crystal boundary are reduced or avoided, the hardness of the mold core is uniform, the forming and demolding effects of the mold core are improved, and the hardness and the strength of the tempered mold core are good; the oxidation film layer or the nitridation film layer formed by oxidation or nitridation treatment in finish machining separates the die core metal from the casting material, so that the phenomenon that the casting material is stuck is avoided, and the problem that the die core of the engine cylinder body in the prior art is easily stuck is solved.
In one embodiment, the blanking and rough machining produces a core blank comprising: h13 steel is selected for blanking, a rudiment is formed through bench work processing and numerical control processing, and finishing allowance is reserved to obtain a mold core blank. The H13 steel has excellent heat resistance, wear resistance, strength and hardness, and is suitable for use as casting mold material.
In one embodiment, the leaving of a finishing allowance comprises: and reserving a finishing allowance of 1-1.8 mm. The left finishing allowance can provide the machining allowance for the subsequent polishing.
In one embodiment, the finishing further comprises: excess material and burrs are removed prior to polishing.
In one embodiment, the polishing is performed with 220# -600# sandpaper. And (5) polishing the surface of the mold core to the extent of 320# abrasive paper after sanding.
In one embodiment, the thickness of the oxide film layer or the nitride film layer is less than or equal to 0.13 mm. The thickness of the oxide film layer or the nitride film layer is set to be less than or equal to 0.13mm, so that the thickness of the oxide film layer or the nitride film layer is moderate, and the over-thick oxide film layer or the over-thick nitride film layer is easy to fall off at parting surfaces and sharp corners, so that a casting is scratched during demoulding.
The processing technology of the engine cylinder body mold core has the beneficial effects that:
(1) the heat treatment of the engine cylinder body mold core processing technology of the invention enables the microstructure of the mold core to be transformed into martensite, reduces or avoids carbide, bainite and residual austenite precipitated along the grain boundary, enables the hardness of the mold core to be uniform, improves the forming and demoulding effects, and ensures that the hardness and the strength of the tempered mold core are good.
(2) The oxidation film layer or the nitridation film layer formed by oxidation or nitridation treatment in the finish machining of the engine cylinder body mold core machining process separates the mold core metal from the casting material, avoids the phenomenon that the casting material is adhered, and solves the problem that the engine cylinder body mold core in the prior art is easily adhered.
(3) The processing process of the engine cylinder body mold core is simple, and the comprehensive performance of the mold core can be obviously improved.
Detailed Description
The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The invention relates to a processing technology of a mold core of an engine cylinder body, which comprises the following steps:
blanking and obtaining a mold core blank through rough machining, and further carrying out heat treatment and finish machining on the mold core blank to obtain a mold core;
wherein the heat treatment comprises: continuously heating the mold core blank to 980-1030 ℃, then cooling the mold core blank to 420-450 ℃ by using oil cooling or air cooling, then air cooling, and tempering the air-cooled mold core blank to ensure that the hardness of the mold core blank is 45-48 HRC;
the finishing comprises: and polishing the core blank, and carrying out oxidation or nitridation treatment to form an oxide film layer or a nitride film layer.
According to the processing technology of the engine cylinder body mold core, the mold core blank is subjected to heat treatment and finish machining, the microstructure of the mold core is converted into martensite through the heat treatment, carbides, bainite and residual austenite precipitated along a grain boundary are reduced or avoided, the hardness of the mold core is uniform, the forming and demolding effects are improved, and the hardness and the strength of the tempered mold core are good; the oxidation film layer or the nitridation film layer formed by oxidation or nitridation treatment in finish machining separates the die core metal from the casting material, so that the phenomenon that the casting material is stuck is avoided, and the problem that the die core of the engine cylinder body in the prior art is easily stuck is solved.
In one embodiment, the blanking and rough machining produces a core blank comprising: h13 steel is selected for blanking, a rudiment is formed through bench work processing and numerical control processing, and finishing allowance is reserved to obtain a mold core blank. The H13 steel has excellent heat resistance, wear resistance, strength and hardness, and is suitable for use as casting mold material.
In one embodiment, the leaving of a finishing allowance comprises: and reserving a finishing allowance of 1-1.8 mm. The left finishing allowance can provide the machining allowance for the subsequent polishing.
The left finishing allowance is determined according to the size of the mold core, and under the normal condition, the small and medium mold cores leave the finishing allowance of 1-1.4mm, and the large mold cores leave the finishing allowance of 1.4-1.8 mm.
In one embodiment, the finishing further comprises: excess material and burrs are removed prior to polishing.
In one embodiment, the polishing is performed with 220# -600# sandpaper. And (5) polishing the surface of the mold core to the extent of 320# abrasive paper after sanding.
In one embodiment, the thickness of the oxide film layer or the nitride film layer is less than or equal to 0.13 mm. The thickness of the oxide film layer or the nitride film layer is set to be less than or equal to 0.13mm, so that the thickness of the oxide film layer or the nitride film layer is moderate, and the over-thick oxide film layer or the over-thick nitride film layer is easy to fall off at parting surfaces and sharp corners, so that a casting is scratched during demoulding.
The processing technology of the engine cylinder body mold core has the beneficial effects that:
(1) the heat treatment of the engine cylinder body mold core processing technology of the invention enables the microstructure of the mold core to be transformed into martensite, reduces or avoids carbide, bainite and residual austenite precipitated along the grain boundary, enables the hardness of the mold core to be uniform, improves the forming and demoulding effects, and ensures that the hardness and the strength of the tempered mold core are good.
(2) The oxidation film layer or the nitridation film layer formed by oxidation or nitridation treatment in the finish machining of the engine cylinder body mold core machining process separates the mold core metal from the casting material, avoids the phenomenon that the casting material is adhered, and solves the problem that the engine cylinder body mold core in the prior art is easily adhered.
(3) The processing process of the engine cylinder body mold core is simple, and the comprehensive performance of the mold core can be obviously improved.
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 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.
Claims (6)
1. A processing technology for a mold core of an engine cylinder block is characterized by comprising the following steps:
blanking and obtaining a mold core blank through rough machining, and further carrying out heat treatment and finish machining on the mold core blank to obtain a mold core;
wherein the heat treatment comprises: continuously heating the mold core blank to 980-1030 ℃, then cooling the mold core blank to 420-450 ℃ by using oil cooling or air cooling, then air cooling, and tempering the air-cooled mold core blank to ensure that the hardness of the mold core blank is 45-48 HRC;
the finishing comprises: and polishing the core blank, and carrying out oxidation or nitridation treatment to form an oxide film layer or a nitride film layer.
2. The engine block mold core machining process according to claim 1, characterized in that: blanking and obtaining a mold core blank through rough machining, comprising: h13 steel is selected for blanking, a rudiment is formed through bench work processing and numerical control processing, and finishing allowance is reserved to obtain a mold core blank.
3. The engine block mold core machining process according to claim 2, characterized in that: said allowance for finishing comprises: and reserving a finishing allowance of 1-1.8 mm.
4. The engine block mold core machining process according to any one of claims 1 to 3, characterized in that: the finishing further comprises: excess material and burrs are removed prior to polishing.
5. The engine block mold core machining process according to claim 4, characterized in that: and the polishing is carried out by using 220# -600# sandpaper.
6. The engine block mold core machining process according to any one of claims 1 to 3, characterized in that: the thickness of the oxidation film layer or the nitridation film layer is less than or equal to 0.13 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911214104.1A CN110757113A (en) | 2019-12-02 | 2019-12-02 | Machining process for engine cylinder body mold core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911214104.1A CN110757113A (en) | 2019-12-02 | 2019-12-02 | Machining process for engine cylinder body mold core |
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| Publication Number | Publication Date |
|---|---|
| CN110757113A true CN110757113A (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201911214104.1A Withdrawn CN110757113A (en) | 2019-12-02 | 2019-12-02 | Machining process for engine cylinder body mold core |
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| CN (1) | CN110757113A (en) |
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|---|---|---|---|---|
| CN1296868A (en) * | 2000-11-21 | 2001-05-30 | 白荣铠 | Casting technology and apparatus for producing die-cast ingot, castings and conticast billet |
| US20070012179A1 (en) * | 2005-07-08 | 2007-01-18 | Toshihiro Takami | Cylinder liner and engine |
| JP2010082635A (en) * | 2008-09-30 | 2010-04-15 | Nissan Motor Co Ltd | Die for hot-forging and hot-forging method |
| CN102825438A (en) * | 2012-08-29 | 2012-12-19 | 湖北航天三江红林机电科技有限公司 | Processing method of four-station concave die |
| CN105364433A (en) * | 2015-11-27 | 2016-03-02 | 昆山惠众机电有限公司 | Hot-working die production technology |
| CN105479124A (en) * | 2014-10-11 | 2016-04-13 | 青岛三利智能动力有限公司 | Processing method for aluminum die for rotor die casting |
| CN105671437A (en) * | 2016-01-25 | 2016-06-15 | 陈焕道 | Manufacturing method of restrictor of engine |
| CN106736326A (en) * | 2016-12-13 | 2017-05-31 | 柳州通为机械有限公司 | Automobile die method for surface hardening |
| CN107598128A (en) * | 2017-09-23 | 2018-01-19 | 安徽福斯特铝制品股份有限公司 | The manufacturing process of high-effect wheel hub mold |
| CN109128734A (en) * | 2018-10-15 | 2019-01-04 | 苏州金瑞阳模具有限公司 | A kind of processing method of OEM aluminum-alloy wheel casting mould bed die |
| CN110257598A (en) * | 2019-07-22 | 2019-09-20 | 广州市型腔模具制造有限公司 | A kind of die casting heat treatment process |
-
2019
- 2019-12-02 CN CN201911214104.1A patent/CN110757113A/en not_active Withdrawn
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296868A (en) * | 2000-11-21 | 2001-05-30 | 白荣铠 | Casting technology and apparatus for producing die-cast ingot, castings and conticast billet |
| US20070012179A1 (en) * | 2005-07-08 | 2007-01-18 | Toshihiro Takami | Cylinder liner and engine |
| JP2010082635A (en) * | 2008-09-30 | 2010-04-15 | Nissan Motor Co Ltd | Die for hot-forging and hot-forging method |
| CN102825438A (en) * | 2012-08-29 | 2012-12-19 | 湖北航天三江红林机电科技有限公司 | Processing method of four-station concave die |
| CN105479124A (en) * | 2014-10-11 | 2016-04-13 | 青岛三利智能动力有限公司 | Processing method for aluminum die for rotor die casting |
| CN105364433A (en) * | 2015-11-27 | 2016-03-02 | 昆山惠众机电有限公司 | Hot-working die production technology |
| CN105671437A (en) * | 2016-01-25 | 2016-06-15 | 陈焕道 | Manufacturing method of restrictor of engine |
| CN106736326A (en) * | 2016-12-13 | 2017-05-31 | 柳州通为机械有限公司 | Automobile die method for surface hardening |
| CN107598128A (en) * | 2017-09-23 | 2018-01-19 | 安徽福斯特铝制品股份有限公司 | The manufacturing process of high-effect wheel hub mold |
| CN109128734A (en) * | 2018-10-15 | 2019-01-04 | 苏州金瑞阳模具有限公司 | A kind of processing method of OEM aluminum-alloy wheel casting mould bed die |
| CN110257598A (en) * | 2019-07-22 | 2019-09-20 | 广州市型腔模具制造有限公司 | A kind of die casting heat treatment process |
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Application publication date: 20200207 |
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