CN110814206A - Bulging forming method for engine combustion chamber part - Google Patents

Bulging forming method for engine combustion chamber part Download PDF

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Publication number
CN110814206A
CN110814206A CN201911165854.4A CN201911165854A CN110814206A CN 110814206 A CN110814206 A CN 110814206A CN 201911165854 A CN201911165854 A CN 201911165854A CN 110814206 A CN110814206 A CN 110814206A
Authority
CN
China
Prior art keywords
bulging
die
combustion chamber
expanding
female
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911165854.4A
Other languages
Chinese (zh)
Inventor
姜男
徐晶
孙健通
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenyang Aerospace Xinguang Group Co Ltd
Original Assignee
Shenyang Aerospace Xinguang Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenyang Aerospace Xinguang Group Co Ltd filed Critical Shenyang Aerospace Xinguang Group Co Ltd
Priority to CN201911165854.4A priority Critical patent/CN110814206A/en
Publication of CN110814206A publication Critical patent/CN110814206A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/04—Expanding other than provided for in groups B21D1/00 - B21D28/00, e.g. for making expanded metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides

Abstract

The invention relates to a bulging forming method for engine combustion chamber parts, which comprises the following steps: installing the bulging die on a hydraulic press, opening the upper die seat and the lower die seat of the bulging die to proper heights, lubricating the inner hole of the cylindrical hollow blank, then sleeving the inner hole of the cylindrical hollow blank outside the bulging female die, slowly descending the bulging male die to a calculated distance during forming, ascending the bulging male die after stabilization, taking down the formed part after unloading the equipment, replacing the bulging male die and the bulging female die with different diameters, and forming the combustion chamber part with other specifications. The invention is adopted to process products, the processed parts have high dimensional precision and high efficiency, and the expanding convex-concave dies with different sizes are selected to form combustion chamber parts with different diameters.

Description

Bulging forming method for engine combustion chamber part
Technical Field
The invention relates to a bulging process, in particular to a bulging forming method for an engine combustion chamber.
Background
The bulging process is characterized in that the bulging medium is utilized to enable the thin-walled tubular part to bear load to generate plastic deformation, so that the forming and high-precision realization are achieved. The bulging die can complete the working procedures of thinning the thickness and increasing the surface area of a blank in one stroke of a hydraulic press, is usually combined with other stamping modes to form military parts with complex shapes, and is a simple, mature and reliable stamping forming method.
However, the existing bulging process cannot meet the forming requirements of combustion chamber parts which are relatively complex in shape, high in dimensional accuracy requirement and capable of being produced in batches.
Disclosure of Invention
The invention provides a bulging forming method for an engine combustion chamber, aiming at the problems in the prior art, and the bulging forming requirement of combustion chamber parts is met.
The technical scheme of the invention comprises the following steps:
installing an expanding die on a hydraulic machine, opening an upper die seat and a lower die seat of the expanding die to a proper height, lubricating an inner hole of a cylindrical hollow blank, then sleeving the inner hole outside an expanding female die, slowly descending an expanding male die to a calculated distance during forming, ascending the expanding male die after stabilization, taking down a formed part after unloading equipment, replacing expanding male and female dies with different diameters, and forming a combustion chamber part with another specification;
the bulging die structure comprises an upper die base, a lower die base, a bulging female die and a bulging male die, wherein the bottom end of the bulging female die is mounted on the lower die base, the top end of the bulging male die is mounted on the upper die base, and the bulging male die is inserted into the bulging female die.
The diameter D of the blank0Calculated from the following formula:
D0＝Dmax/K
in the formula: dmaxMaximum diameter of the expanded part
K-ultimate bulging coefficient
Wherein the ultimate bulging coefficient of the material is related to the allowable elongation of the material.
The length L of the blank0Calculated from the following formula:
L0＝L[1+(0.3～0.4)δ]+Δl
in the formula: l-length of the bus of the workpiece
δ——δ＝(Dmax-D0)/D0
Delta l is trimming allowance and is 10-20 mm.
During bulging, the bulging force is calculated according to the following formula:
F＝P*A
in the formula: f-bulging force (N)
P-bulging Unit pressure (MPa)
A-area of bulging (mm)2)
The bulging specific pressure P is related to the tensile strength of the part material, the maximum bulging diameter, and the original thickness of the part.
The bulging female die is a split female die, the split female die is a circular inner cavity formed by 8 die pieces, and the gaps between the 8 die pieces and the bulging male die are consistent.
The roughness of the molded surfaces of the bulging male die and the bulging female die is required to be 0.4 mu m.
The invention has the following positive effects:
the invention has the advantages that the product processing is carried out, the processed parts have high dimensional accuracy and high efficiency, and the expansion convex-concave dies with different sizes are selected, so that various combustion chamber parts with different diameters can be formed, the requirements of the technology and the batch production of enterprises are met, and meanwhile, the production cost is reduced. The die has the advantages of reliable production, convenient maintenance, short processing period and high efficiency, and meets the requirements of the engine on the precision, the efficiency, the service life and the repair of parts.
Drawings
FIG. 1 is a schematic structural diagram of a combustion chamber component being processed according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a blank according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of the bulging die of the present invention.
FIG. 4 is a schematic view of the top view of the bulging die of the present invention
Fig. 5 is a schematic structural diagram of the bulging male die of the present invention.
Fig. 6 is a schematic structural diagram of the bulging die of the present invention.
Detailed Description
Examples
The method of the present invention is used to process combustion chamber parts of two specifications for certain engine, the selected material is non-ferrous chromium-zirconium-copper (C18150), the wall thickness of the part is 1.6mm and 1.4mm, the structure of the part is a cylindrical hollow part, and the part belongs to the bulging of a cylindrical hollow blank, that is, a pipe blank is expanded and formed outwards in the radius direction.
Installing an expanding die on a hydraulic machine, opening an upper die seat and a lower die seat of the expanding die to a proper height, lubricating an inner hole of a cylindrical hollow blank, then sleeving the inner hole outside an expanding female die, slowly descending an expanding male die to a calculated distance during forming, ascending the expanding male die after stabilization, taking down a formed part after unloading equipment, replacing expanding male and female dies with different diameters, and forming a combustion chamber part with another specification;
the bulging die structure comprises an upper die base 7, a lower die base 1, a bulging female die 4 and a bulging male die 5, wherein the bottom end of the bulging female die 4 is mounted on the lower die base 1 through a positioning pin 2, the top end of the bulging male die 5 is mounted on the upper die base through a screw 8, and the bulging male die is inserted into the bulging female die. The bulging female die is a split female die, the split female die is a circular inner cavity formed by 8 die pieces, friction force between the die pieces and the blank can be relieved, the number of the die pieces is increased, deformation is uniform, and meanwhile the purpose of improving part precision can be achieved. The clearance between the 8 mould sections and the bulging convex mould is consistent, so that the chromium-zirconium-copper material blank is prevented from being scratched due to uneven stress of the material. The roughness of the molded surfaces of the bulging male die and the bulging female die is required to be 0.4 mu m.
The diameter D of the blank0Calculated from the following formula:
D0＝Dmax/K
in the formula: dmaxMaximum diameter of the expanded part
K-ultimate bulging coefficient
Wherein the ultimate bulging coefficient of the material is related to the allowable elongation of the material.
Increasing the deformation degree of the material in the circumferential direction and reducing the thinning of the material, so that the material is freely contracted and the blank length L is increased0Increasing the shrinkage by a portion of the length of the part; length of said blankL0Calculated from the following formula:
L0＝L[1+(0.3～0.4)δ]+Δl
in the formula: l-length of the bus of the workpiece
δ——δ＝(Dmax-D0)/D0
Delta l is trimming allowance and is 10-20 mm.
During bulging, the bulging force is calculated according to the following formula:
F＝P*A
in the formula: f-bulging force (N)
P-bulging Unit pressure (MPa)
A-area of bulging (mm)2)
The bulging specific pressure P is related to the tensile strength of the part material, the maximum bulging diameter, and the original thickness of the part.

Claims (6)

1. The bulging forming method for the engine combustion chamber is characterized by comprising the following steps: installing an expanding die on a hydraulic machine, opening an upper die seat and a lower die seat of the expanding die to a proper height, lubricating an inner hole of a cylindrical hollow blank, then sleeving the inner hole outside an expanding female die, slowly descending an expanding male die to a calculated distance during forming, ascending the expanding male die after stabilization, taking down a formed part after unloading equipment, replacing expanding male and female dies with different diameters, and forming a combustion chamber part with another specification;
the bulging die structure comprises an upper die base, a lower die base, a bulging female die and a bulging male die, wherein the bottom end of the bulging female die is mounted on the lower die base, the top end of the bulging male die is mounted on the upper die base, and the bulging male die is inserted into the bulging female die.
2. The method of claim 1, wherein the billet diameter D is a diameter of a billet0Calculated from the following formula:
D0＝Dmax/K
in the formula: dmaxMaximum diameter of the expanded part
K-ultimate bulging coefficient
Wherein the ultimate bulging coefficient of the material is related to the allowable elongation of the material.
3. The engine combustion chamber expander forming method of claim 1, wherein said blank length L is set to be longer than said blank length L0Calculated from the following formula:
L0＝L[1+(0.3～0.4)δ]+Δl
in the formula: l-length of the bus of the workpiece
δ——δ＝(Dmax-D0)/D0
Delta l is trimming allowance and is 10-20 mm.
4. The method of bulge forming for an engine combustion chamber according to claim 1, wherein the bulging force at the time of bulge forming is calculated as follows:
F＝P*A
in the formula: f-bulging force (N)
P-bulging Unit pressure (MPa)
A-area of bulging (mm)2)
The bulging specific pressure P is related to the tensile strength of the part material, the maximum bulging diameter, and the original thickness of the part.
5. The bulging forming method for the engine combustion chamber according to claim 1, characterized in that the bulging female die is a split female die, the split female die is a circular inner cavity formed by 8 die pieces, and the gaps between the 8 die pieces and the bulging male die are consistent.
6. The method of claim 1, wherein the profile roughness of the bulging male die and the bulging female die is required to be 0.4 μm.
CN201911165854.4A 2019-11-25 2019-11-25 Bulging forming method for engine combustion chamber part Pending CN110814206A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911165854.4A CN110814206A (en) 2019-11-25 2019-11-25 Bulging forming method for engine combustion chamber part

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911165854.4A CN110814206A (en) 2019-11-25 2019-11-25 Bulging forming method for engine combustion chamber part

Publications (1)

Publication Number Publication Date
CN110814206A true CN110814206A (en) 2020-02-21

Family

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CN201911165854.4A Pending CN110814206A (en) 2019-11-25 2019-11-25 Bulging forming method for engine combustion chamber part

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201052535Y (en) * 2007-04-30 2008-04-30 张家港市合丰机械制造有限公司 Expasion pipe mold
CN101394952A (en) * 2006-03-09 2009-03-25 住友金属工业株式会社 Mechanical expander and production method for seamless steel pipe
CN202398708U (en) * 2011-12-20 2012-08-29 保隆(安徽)汽车配件有限公司 Upright eight-petal bulging die
EP2535124A1 (en) * 2011-06-16 2012-12-19 SMS Meer GmbH Mechanical pipe expander
CN203418000U (en) * 2013-07-30 2014-02-05 保隆(安徽)汽车配件有限公司 Pipe fitting bulging mould
CN207857684U (en) * 2017-12-22 2018-09-14 佛山市顺德区朴田电器有限公司 A kind of expander mold of compressor main casing
CN209334575U (en) * 2018-11-16 2019-09-03 宏源精工车轮股份有限公司 A kind of expander die

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101394952A (en) * 2006-03-09 2009-03-25 住友金属工业株式会社 Mechanical expander and production method for seamless steel pipe
CN201052535Y (en) * 2007-04-30 2008-04-30 张家港市合丰机械制造有限公司 Expasion pipe mold
EP2535124A1 (en) * 2011-06-16 2012-12-19 SMS Meer GmbH Mechanical pipe expander
CN202398708U (en) * 2011-12-20 2012-08-29 保隆(安徽)汽车配件有限公司 Upright eight-petal bulging die
CN203418000U (en) * 2013-07-30 2014-02-05 保隆(安徽)汽车配件有限公司 Pipe fitting bulging mould
CN207857684U (en) * 2017-12-22 2018-09-14 佛山市顺德区朴田电器有限公司 A kind of expander mold of compressor main casing
CN209334575U (en) * 2018-11-16 2019-09-03 宏源精工车轮股份有限公司 A kind of expander die

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
韩英淳: "《简明冲压工艺与模具设计手册》", 30 November 2006, 上海科学技术出版社 *

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Application publication date: 20200221