CN109317937B - Improved aluminum piston machining method - Google Patents
Improved aluminum piston machining method Download PDFInfo
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- CN109317937B CN109317937B CN201811342596.8A CN201811342596A CN109317937B CN 109317937 B CN109317937 B CN 109317937B CN 201811342596 A CN201811342596 A CN 201811342596A CN 109317937 B CN109317937 B CN 109317937B
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- 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
- B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
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- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses an improved aluminum piston machining method. The processing method comprises the following steps: (1) in the process of finely turning the skirt part, simultaneously finely turning a top surface positioning surface; (2) positioning and finely boring the pin hole 8 by adopting a top surface positioning surface 27 and a head outer circle 9, wherein the perpendicularity error of the pin hole axis and the skirt part axis is determined; (3) and finally, finish turning the top surface 7 to finish machining the aluminum piston. The improved processing method of the invention is characterized in that the skirt part and the top surface positioning surface are processed by one-time clamping on the same positioning reference, and the finish-bored pin hole is positioned by the top surface positioning surface and the head excircle, so that the pin hole and the skirt part have shortened reference conversion chain in the processing process (only related to the skirt part finish-turning process and the pin hole finish-boring process), and the verticality error between the pin hole axis and the skirt part axis is reduced.
Description
Technical Field
The invention relates to the field of machining processes, in particular to an improved aluminum piston machining process.
Background
The perpendicularity error of the axis of the aluminum piston pin hole and the axis of the skirt portion is an important position error which is difficult to control in the machining of the aluminum piston, and the error out-of-tolerance is one of main reasons for influencing the machining qualified rate of the aluminum piston.
In a common aluminum piston machining process, as a pin hole and a skirt part have a plurality of datum conversion (datum inconsistency) errors in the machining process, a datum conversion chain is long (related to a skirt part finish turning process, a top surface finish turning process and a pin hole finish boring process), so that the perpendicularity error of an axis of an aluminum piston pin hole and an axis of the skirt part is difficult to control.
Disclosure of Invention
The invention aims to provide an improved aluminum piston machining method.
In order to solve the technical problems, the invention adopts the technical scheme that the improved aluminum piston machining method comprises the following steps:
(1) in the process of finely turning the skirt part, simultaneously finely turning a top surface positioning surface;
(2) positioning and finely boring the pin hole 8 by adopting a top surface positioning surface 27 and a head outer circle 9, wherein the perpendicularity error of the pin hole axis and the skirt part axis is determined;
(3) and finally, finish turning the top surface 7 to finish machining the aluminum piston.
Preferably, in step (1), after one positioning and clamping, the machining of the skirt part 6 and the machining of the top positioning surface 27 are completed, and the top positioning surface 27 is an annular plane perpendicular to the axis of the piston skirt part.
Preferably, the piston skirt axis is the piston axis of rotation.
The aluminum piston of the invention has the following processing sequence: finish turning skirt → finish boring pin hole → finish turning top surface.
The invention has the beneficial effects that:
after the improved machining method is adopted, the skirt part and the top surface positioning surface are machined by one-time clamping of the same positioning datum, and the finish-bored pin hole is positioned by the top surface positioning surface and the head part excircle, so that a datum conversion chain is shortened in the machining process of the pin hole and the skirt part (only related to a skirt part finish-turning process and a pin hole finish-boring process), and the perpendicularity error of the pin hole axis and the skirt part axis is favorably reduced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of an aluminum piston and portions thereof according to an embodiment of the present invention.
FIG. 2 is a prior art method of fine turning the outer circle of the head and fine turning the profile of the skirt.
Fig. 3 is a positioning method commonly used for finish turning of a roof surface in the prior art.
FIG. 4 is a prior art aluminum piston crown shape after finish turning the crown.
FIG. 5 is a prior art positioning schematic of a finely bored aluminum piston pin bore.
FIG. 6 is a schematic view of a finish turned skirt and top locating surface of an embodiment of the present invention.
FIG. 7 is a schematic illustration of a process for fine boring an aluminum piston pin bore using a top locating surface as a locating datum according to an embodiment of the present invention.
Labeled in fig. 1 to 7: 1-spigot end face, 2-spigot inner chamfer, 3-spigot inner side face, 4-thimble hole, 5-head, 6-skirt, 7-top face, 8-pinhole, 9-head excircle, 10-annular groove, 11-pinhole axis, 12-skirt axis, 17-processed top face, 27-top face positioning face, F1-finish turning top face clamping force and F2-finish boring pinhole clamping force.
Detailed Description
FIG. 1 shows a piston made of aluminum material, which is an integral part composed of a head part 5 and a skirt part 6, wherein the middle part of the piston is provided with a through hole, namely a pin hole 8 along the radial direction, and an annular groove 10 is arranged along the circumferential direction of an outer circle 9 of the head part. The relevant dimensional parameters are as follows: the distance from the axis 11 of the pin hole to the top surface 7 of the piston blank is 62mm (the top surface is not machined), after the top surface is finely turned, the distance from the axis of the pin hole to the top surface of the piston is 60 +/-0.03 mm, and the diameter of the excircle of the head part 5 of the piston is phi 90 +/-0.02 mm.
Machining method of aluminum piston commonly used at present
In the conventional machining process of aluminum pistons, the machining references mainly include (see fig. 1): a spigot end face 1, a spigot inner chamfer 2, a spigot inner side face 3 and a thimble hole 4.
The perpendicularity error between the aluminum piston pin hole axis 11 and the skirt portion axis 12 is the comprehensive reflection of a plurality of procedures positioning benchmark errors and machining errors of a finishing section, and except for the position errors among the spigot end face 1, the spigot internal chamfer 2 and the thimble hole 4, the procedures influencing the error mainly comprise: finish turning of the skirt portion 6 (after finish turning of the skirt portion, a convex variable elliptic profile is generally formed), finish turning of the top face 7 and finish boring of the pin hole 8.
The processing sequence generally employed is: finish turning skirt 6 → finish turning top 7 → finish boring pin hole 8, see fig. 1.
In the machining procedure of finish turning of the skirt 6, the inner chamfer 2 and the thimble hole 4 are adopted for positioning, the thimble hole 4 simultaneously clamps (tightly jacks) the piston, and as shown in fig. 2, the surface of the finish-turned skirt is generally a convex variable elliptic profile; in the process of finish turning the top surface, the spigot end surface 1 and the spigot inner side surface 3 are used for positioning, F1 is clamping force, as shown in figure 3, and the processed top surface 17 is shown in figure 4; in the fine boring of the pin hole 8, using the top surface 7 and the head outer circle 9 for positioning, F2 is the clamping force, as shown in fig. 5.
The measurement reference of the perpendicularity error of the piston pin hole axis 11 and the skirt portion axis 12 is the skirt portion axis 12, the skirt portion axis needs to be determined through a skirt portion surface, and the positioning reference of machining the skirt portion surface is the spigot internal chamfer angle 2 and the thimble hole 4; on the other hand, the processing of the piston top surface 7 is positioned by the spigot end surface 1 (without the thimble hole 4) and is inconsistent with the positioning standard of the processed skirt part; the positioning reference of the pin hole finish boring process is that the top surface 7 and the head excircle 9 (the ring groove 10 on the surface of the head excircle needs to be machined before the head excircle is machined) of the piston after finish turning are different from the positioning reference of the machined skirt part. Therefore, as turning is performed according to a conventional method, the pin hole and the skirt portion have a plurality of reference conversion (reference inconsistency) errors during the machining process, and the reference conversion chain is long (related to a skirt portion finish turning process, a top surface finish turning process and a pin hole finish boring process), so that the perpendicularity error of the piston pin hole axis 11 and the skirt portion axis 12 is difficult to control.
Second, improved aluminum piston processing method
An improved aluminum piston machining process comprises the following steps:
while the skirt part 6 is finely turned, the finely turned top surface positioning surface 27 is added, namely: and after one-time positioning and clamping, the skirt part 6 and the top surface positioning surface 27 are machined. The top locating surface 27 is an annular flat surface that is perpendicular to the skirt axis 12 (i.e., the axis of piston rotation), the top locating surface 27 is spaced 60.5 + -0.03 from the pin bore axis 11, and the top locating surface 27 has an inside diameter φ 60, as shown in FIG. 6. The fine bored pin bore 8 is then positioned using the top locating surface 27 and the head outer circle 9, see fig. 7. After which the top surface 7 is finish-turned, see fig. 3. The relevant processing sequence is: finish turning skirt 6 (including top surface locating surface 27) → finish boring pin holes 8 → finish turning top surface 7.
When the process is adopted to process the aluminum piston, the perpendicularity error of the pin hole axis 11 and the skirt part axis 12 is only related to the processing procedures of finish turning the skirt part 6 and finish boring the pin hole 8, but is not related to the procedure of finish turning the top surface 7, so that error sources are reduced, and the perpendicularity error of the pin hole axis 11 and the skirt part axis 12 in the processing process is easier to guarantee.
After the improved aluminum piston machining process is adopted, the skirt portion 6 and the top surface positioning surface 27 are machined by one-time clamping of the same positioning datum, and the finish boring pin hole 8 is positioned by the top surface positioning surface 27 and the head portion outer circle 9, so that a datum conversion chain of the pin hole and the skirt portion is shortened in the machining process (only related to a skirt portion finish turning process and a pin hole finish boring process), and the perpendicularity error of the pin hole axis and the skirt portion axis is favorably reduced.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (3)
1. An improved aluminum piston machining method comprises the following steps:
(1) in the process of finely turning the skirt part, simultaneously finely turning a top surface positioning surface;
(2) positioning and finely boring the pin hole (8) by adopting a top surface positioning surface (27) and a head excircle (9), wherein the perpendicularity error between the axis of the pin hole and the axis of the skirt part is determined;
(3) and finally, finish turning the top surface (7) to finish machining the aluminum piston.
2. The aluminum piston machining method according to claim 1, characterized in that: in the step (1), after one-time positioning and clamping, machining of the skirt part (6) and machining of the top surface positioning surface (27) are completed, and the top surface positioning surface (27) is an annular plane perpendicular to the axis of the piston skirt part.
3. The aluminum piston machining method according to claim 2, characterized in that: the piston skirt axis is the piston rotation axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811342596.8A CN109317937B (en) | 2018-11-12 | 2018-11-12 | Improved aluminum piston machining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811342596.8A CN109317937B (en) | 2018-11-12 | 2018-11-12 | Improved aluminum piston machining method |
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| Publication Number | Publication Date |
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| CN109317937A CN109317937A (en) | 2019-02-12 |
| CN109317937B true CN109317937B (en) | 2020-07-10 |
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Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038528C (en) * | 1991-08-29 | 1998-05-27 | 中国科学院长春光学精密机械研究所 | Method and device for comprehensively measuring position error of piston pin hole |
| CN2149262Y (en) * | 1993-03-26 | 1993-12-15 | 长江葛洲坝汽车改装厂 | Piston pressure casting machine |
| US6353987B1 (en) * | 2000-06-09 | 2002-03-12 | Clever Fellows Innovation Consortium, Inc. | Methods relating to constructing reciprocator assembly |
| US6760961B2 (en) * | 2002-02-12 | 2004-07-13 | Focus: Hope | Piston machining |
| CN2659595Y (en) * | 2003-10-23 | 2004-12-01 | 山东滨州渤海活塞股份有限公司 | Upside down type casting mould for aluminium piston |
| CN201130194Y (en) * | 2007-09-21 | 2008-10-08 | 深圳市比克电池有限公司 | Steel needle mold and needle aculeus experimental machine with the same |
| CN102335812B (en) * | 2010-07-20 | 2016-08-03 | 台州市百达电器有限公司 | A kind of manufacture method of piston of reciprocating compressor |
| WO2012112989A1 (en) * | 2011-02-18 | 2012-08-23 | Parker-Hannifin Corporation | Floating optical sensor mount |
| JP2013024156A (en) * | 2011-07-22 | 2013-02-04 | Suzuki Motor Corp | Piston for internal combustion engine |
| CN202597324U (en) * | 2012-05-22 | 2012-12-12 | 徐州压力机械有限公司 | Telescopic piston cylinder |
| CN102672110A (en) * | 2012-06-12 | 2012-09-19 | 曲阜金皇活塞股份有限公司 | Mould for light-weight piston and manufacturing process of same |
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Effective date of registration: 20210107 Address after: No.50, Meilin Avenue, Huangshan Economic Development Zone, Huangshan City, Anhui Province 235000 Patentee after: Huangshan Development Investment Group Co.,Ltd. Address before: 230001 No. 193, Tunxi Road, Hefei, Anhui Patentee before: Hefei University of Technology |
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