CN108561237A - A kind of processing technology of gasoline engine aluminum piston valve hole and its overlap - Google Patents

Abstract

The present invention relates to Piston Machining technical field, the processing technology of specifically a kind of gasoline engine aluminum piston valve hole and its overlap.A kind of structure of gasoline engine aluminum piston valve hole and its overlap, it is characterised in that：It is respectively equipped with one group of valve hole in the main thrust side of aluminum piston top surface and secondary thrust sides, two valve holes are that mutual minute surface is arranged；The valve hole is in " √ " type structure, and the side in valve hole is the arc structure of outwardly convex, and one end of arc structure is equipped with valve and cheats overlap, and valve cheats overlap and the outside piston of aluminum piston connects；The other side in valve hole is vertical structure, the other end of one end connection circular arc of vertical structure, the outside piston of the other end connection aluminum piston of vertical structure.Compared with the existing technology, nothing needs to change the processing in all valves hole that valve hole cutter can be completed on aluminum piston, reduces the process-cycle, it improves work efficiency, optimization piston valve cheats the design of overlap, is designed to the shape of " √ ", improves the overall quality of aluminum piston.

Description

A Processing Technology of Gasoline Engine Aluminum Piston Valve Crater and Its Flash

technical field

The invention relates to the technical field of piston processing, in particular to a processing technology for a gasoline engine aluminum piston valve pit and its flash.

Background technique

Due to the high compression ratio of gasoline engine pistons, it is necessary to increase the valve pit on the top surface of the piston to avoid interference with the valve when the piston moves to the top dead center. However, the deeper valve pit and the diameter of the valve pit will lead to too little material between the machined valve pit and the outer circle of the piston, forming sharp edges and burrs. This will inevitably add a process after processing the valve pit: machining the valve Pit fly edge.

For the existing piston processing method, because the tool for machining the flash of the valve pit is different from the tool for machining the valve pit, the tool needs to be replaced after machining the valve pit. Usually, the valve pit diameters ΦDts of the main thrust side and the auxiliary thrust side are different, and the entire machining process requires two additional tool changes and machining time, which prolongs the machining cycle by more than 20 seconds and increases additional costs.

For the existing piston processing method, due to the lack of material remaining in the flash of the machined valve pit and the flash burrs caused by machining deviations, during the operation of the engine: on the one hand, early combustion leads to excessive temperature of the flash, and the oxidation of aluminum materials Shedding and, on the other hand, poor airflow movement leads to an increase in particulate matter (PN) in the exhaust gas.

Contents of the invention

In order to overcome the deficiencies of the prior art, the invention provides a process for processing the aluminum piston valve pit and flash edge of a gasoline engine.

In order to achieve the above object, a structure of a gasoline engine aluminum piston valve pit and flash edge thereof is designed, including an aluminum piston, which is characterized in that: a group of valve pits are respectively arranged on the main thrust side and the secondary thrust side of the aluminum piston top surface. A group of valve pits consists of two valve pits, and the two valve pits are respectively located on the upper side and the lower side of the top surface of the aluminum piston, and the two valve pits are arranged in a mutual mirror surface; the said valve pits are in a "√"-shaped structure , one side of the valve pit is an outwardly protruding arc structure, and one end of the arc structure is provided with a valve pit flash, which is connected with the piston outer circle of the aluminum piston; the other side of the valve pit is a vertical Straight structure, one end of the vertical structure is connected to the other end of the arc, and the other end of the vertical structure is connected to the piston outer circle of the aluminum piston.

The set of valve pits on the main thrust side and the set of valve pits on the auxiliary thrust side are mutually mirrored.

The distance between the valve pit flash and the first ring groove of the aluminum piston is greater than or equal to 3.4mm.

The width of the valve pit flash is greater than or equal to 1.2mm.

A kind of processing technology of aluminum piston valve pit and flash edge of gasoline engine, the specific processing technology is as follows:

(1) Process the main thrust side first;

(2) After machining the main thrust side, machine the auxiliary thrust side.

The processing technology of the main thrust side is as follows:

(1) Find the center of the valve pit, the center line of the pin hole of the aluminum piston, and the center line of the aluminum piston;

(2) According to the model of the aluminum piston, define the diameter of the valve pit as ΦDts, the depth of the valve pit L1st, and the angle Bst of the valve pit;

(3) Define the distance from the center of the valve pit to the centerline of the pin hole of the piston as H1ts;

(4) Define the distance from the center of the valve pit to the centerline of the aluminum piston as H2ts;

(5) According to the data of L1st, H1ts and H2ts, the position Pts of the rotation center of the machined valve pit tool is obtained;

(6) Take the rotation center Pts of the valve pit tool as the starting point of the motion track;

(7) Define the radius of the motion track of the valve pit tool rotation center Pts as R1ts;

(8) Define the chamfer between the valve pit and the flash of the valve pit as R2ts, R2ts=0.5mm constant;

(9) Get R1ts= R2ts+(ΦDts/2);

(10) The angle formed by the tangent of the movement track of the tool rotation center and the centerline of the pin hole of the aluminum piston is Ats, and the value range of Ats is 50°~60°.

The processing technology of the auxiliary thrust side is consistent with that of the main thrust side.

Compared with the prior art, the present invention can complete the processing of all valve pits on the aluminum piston without replacing the valve pit tool according to the processing technology of the main thrust side and the auxiliary thrust side of the aluminum piston, which reduces the processing cycle and greatly improves the work efficiency. In addition, the design of the flash edge of the piston valve pit is optimized, and the shape of "√" is designed to improve the overall quality of the aluminum piston.

Description of drawings

Fig. 1 is a top view of the structure of the present invention.

Fig. 2 is a front view of the structure of the present invention.

Fig. 3 is a schematic diagram of the processing technology of the present invention.

Fig. 4 is a schematic diagram of the machining process of the valve pit in a top view.

Fig. 5 is a sectional view along E-E in Fig. 4 .

Referring to Fig. 1, Fig. 2, 1 is the burr of the valve pit, 2 is the outer circle of the piston, 3 is the valve pit, 4 is the aluminum piston, and 5 is the first annular groove 5.

Refer to Figure 3 to Figure 5, 1 is the flash of the valve pit, 3 is the valve pit, 7 is the centerline of the pin hole of the aluminum piston, 8 is the centerline of the aluminum piston, 9 is the diameter of the valve pit, and 10 is the movement of the tool rotation center The radius of the trajectory, 11 is the distance from the center of the valve pit to the centerline of the pin hole of the piston, 12 is the angle formed by the tangent of the tool rotation center movement track and the pin hole centerline of the aluminum piston, and 13 is the movement track of the valve pit tool rotation center , 14 is the chamfer between the valve pit and the flash of the valve pit, and 15 is the distance from the center of the valve pit to the centerline of the aluminum piston.

Detailed ways

The present invention will be further described below according to the accompanying drawings.

As shown in Fig. 1 and Fig. 2, a group of valve pits are respectively provided on the main thrust side and the auxiliary thrust side of the top surface of the aluminum piston 4, and the described group of valve pits is composed of two valve pits, and the two valve pits 3 Located on the upper side and the lower side of the top surface of the aluminum piston 4 respectively, the two valve pits 3 are arranged as mirrors of each other; the valve pit 3 is in a "√"-shaped structure, and one side of the valve pit 3 is a circle protruding outward. arc structure, and one end of the arc structure is provided with a valve pit flash 1, and the valve pit flash 1 is connected with the piston outer circle 2 of the aluminum piston 4; the other side of the valve pit 3 is a vertical structure, and one end of the vertical structure The other end of the arc is connected, and the other end of the vertical structure is connected to the piston outer circle 2 of the aluminum piston 4 .

A set of valve pits on the main thrust side and a set of valve pits on the auxiliary thrust side are arranged in mirror surfaces.

The distance between the valve pit flash 1 and the first annular groove 5 of the aluminum piston 4 is greater than or equal to 3.4mm.

The width of the flash edge 1 of the valve pit is greater than or equal to 1.2mm.

As shown in Fig. 3 to Fig. 5, a processing technology of aluminum piston valve pit and flash edge of gasoline engine, the specific processing technology is as follows:

(1) Find the center of the valve pit, the center line of the pin hole of the aluminum piston, and the center line of the aluminum piston;

(2) According to the model of the aluminum piston, define the diameter of the valve pit as ΦDts, the depth of the valve pit L1st, and the angle Bst of the valve pit;

(3) Define the distance from the center of the valve pit to the centerline of the pin hole of the piston as H1ts;

(4) Define the distance from the center of the valve pit to the centerline of the aluminum piston as H2ts;

(5) According to the data of L1st, H1ts and H2ts, the position Pts of the rotation center of the machined valve pit tool is obtained;

(6) Take the rotation center Pts of the valve pit tool as the starting point of the motion trajectory;

(7) Define the radius of the motion track of the valve pit tool rotation center Pts as R1ts;

(8) Define the chamfer between the valve pit and the flash of the valve pit as R2ts, R2ts=0.5mm constant;

(9) Get R1ts= R2ts+(ΦDts/2);

(10) The angle formed by the tangent of the movement track of the tool rotation center and the centerline of the pin hole of the aluminum piston is Ats, and the value range of Ats is 50°~60°.

The processing technology of the auxiliary thrust side is the same as that of the main thrust side.

According to the processing technology of the main thrust side and the auxiliary thrust side of the aluminum piston, all the valve pits on the aluminum piston can be processed without changing the valve pit tool, which reduces the processing cycle and greatly improves the work efficiency. In addition, the design of the flash edge of the piston valve pit is optimized, and the shape of "√" is designed to improve the overall quality of the aluminum piston.

Claims (7)

1. the structure of a kind of gasoline engine aluminum piston valve hole and its overlap, including aluminum piston, it is characterised in that：In aluminum piston（4） The main thrust side of top surface and secondary thrust sides are respectively equipped with one group of valve hole, and described one group of valve hole is made of two valve holes, And two valve holes（3）It is located at aluminum piston（4）The upside and downside of top surface, two valve holes（3）For mutual minute surface cloth It sets；The valve hole（3）In " √ " type structure, valve hole（3）Side be outwardly convex arc structure, and circular arc knot One end of structure is equipped with valve and cheats overlap（1）, valve hole overlap（1）With aluminum piston（4）Outside piston（2）Connection；Valve is cheated（3） The other side be vertical structure, the other end of one end connection circular arc of vertical structure, the other end of vertical structure connects aluminum piston （4）Outside piston（2）.

2. the structure of a kind of gasoline engine aluminum piston valve hole according to claim 1 and its overlap, it is characterised in that：It is described One group of valve hole of main thrust side and one group of valve hole of secondary thrust sides be that mutual minute surface is arranged.

3. the structure of a kind of gasoline engine aluminum piston valve hole according to claim 1 and its overlap, it is characterised in that：It is described Valve cheat overlap（1）With aluminum piston（4）The first annular groove（5）Distance be more than or equal to 3.4mm.

4. the structure of a kind of gasoline engine aluminum piston valve hole according to claim 1 or 3 and its overlap, it is characterised in that： The valve cheats overlap（1）Width be more than or equal to 1.2mm.

5. the processing technology of a kind of gasoline engine aluminum piston valve hole and its overlap, it is characterised in that：Specific processing technology is as follows：

First processing main thrust side；

After processing main thrust side, secondary thrust sides are processed.

6. the processing technology of a kind of gasoline engine aluminum piston valve hole according to claim 5 and its overlap, it is characterised in that： The processing technology of the main thrust side is as follows：

（1）Find valve hole center, the pin aperture centerline of aluminum piston, aluminum piston center line；

（2）According to the model of aluminum piston, the angle that a diameter of Φ Dts in valve hole, the depth L1st in valve hole, valve are cheated is defined Bst；

（3）It is H1ts to define the distance that valve cheats center to the pin aperture centerline of piston；

（4）It is H2ts to define the distance that valve cheats center to the center line of aluminum piston；

（5）Show that machining valve cheats the position Pts of cutter rotation center according to the data of L1st, H1ts and H2ts；

（6）Cutter rotation center Pts is cheated as the starting point of movement locus using valve；

（7）The radius for defining valve hole cutter rotation center Pts movement locus is R1ts；

（8）The chamfering defined between valve hole and valve hole overlap is R2ts, R2ts=0.5mm constants；

（9）Obtain R1ts=R2ts+（ΦDts/2）；

（10）The angle that the tangent line of cutter rotation center movement locus and the pin aperture centerline of aluminum piston are formed is Ats, Ats values Ranging from 50 ° ~ 60 °.

7. the processing technology of a kind of gasoline engine aluminum piston valve hole according to claim 5 or 6 and its overlap, feature exists In：The processing technology of the secondary thrust sides is consistent with the processing technology of main thrust side.