Ultra-precision internal grinding machine for conical surface grinding of oil injection nozzle

Abstract

An ultra-precise internal grinding machine for grinding the conical surface of an oil nozzle comprises a machine body provided with a machine body support, an X-axis air floating guide rail and a Z-axis air floating guide rail are arranged at the top of the machine body, the motion trails of the X-axis air floating guide rail and the motion trails of the Z-axis air floating guide rail are perpendicular to each other, and a shaft seat used for installing an oil nozzle workpiece is slidably connected to the X-axis air floating guide rail. The Z-axis air floating guide rail is connected with two grinding wheel shafts used for grinding an oil nozzle workpiece in a sliding mode, and the two grinding wheel shafts are the first grinding wheel shaft and the second grinding wheel shaft which are arranged in parallel. The grinding wheel can rotate and grind the inner conical surface of the oil nozzle in the axial direction in a high-frequency oscillation mode, and therefore the problem that a large amount of time is needed to grind the inner conical surface of the oil nozzle due to the fact that the linear speed of the grinding wheel is too small is solved.

Description

Technical Field

[0001] The utility model relates to the field of grinding the inner conical surface of a fuel injection nozzle, in particular to an ultra-precision internal grinding machine for grinding the conical surface of a fuel injection nozzle. Background Art

[0002] like Figure 3 As shown, the inner diameter of the fuel injector to be processed is 3.5mm±0.006, and the inner conical surface of the fuel injector needs to be polished with a grinding wheel. Since the inner diameter and aperture of the inner conical surface of the fuel injector are small, the grinding wheel used in the grinding process is also very small. Since the grinding wheel is small, the linear speed of the grinding wheel itself during the rotational grinding process is also very small, almost close to zero. When the linear speed of the grinding wheel is too small, the effect of grinding the inner conical surface of the fuel injector will also deteriorate. The grinding wheel shaft used in the existing internal cylindrical grinder can only drive the grinding wheel to rotate and grind along its own axis, so it takes a lot of time to grind the inner conical surface of the fuel injector. Utility Model Content

[0003] The utility model aims to provide an ultra-precision internal grinding machine for grinding the conical surface of a fuel injection nozzle to reduce the grinding time for the inner conical surface of the fuel injection nozzle.

[0004] In order to solve the above technical problems, the specific solution adopted by the utility model is:

[0005] An ultra-precision internal grinding machine for grinding the conical surface of an oil spray nozzle comprises a bed with a bed support, an X-axis air-floating guide rail and a Z-axis air-floating guide rail with vertical motion tracks are respectively arranged on the top of the bed, an axis seat is slidably connected to the X-axis air-floating guide rail, a workpiece axis for mounting the oil spray nozzle workpiece is mounted on the axis seat, a grinding wheel axis for grinding the oil spray nozzle workpiece is slidably connected to the Z-axis air-floating guide rail, the number of the grinding wheel axis is two and they are respectively two parallel first grinding wheel axis and second grinding wheel axis, the second grinding wheel axis is an ultrasonic scribing air-static pressure electric spindle, the ultrasonic scribing air-static pressure electric spindle comprises a rotating shaft located in a housing and driven by a motor, A grinding wheel is provided at the output end of the rotating shaft, and the rotating shaft has a shoulder. A front axial bearing and a rear axial bearing are respectively provided on both sides of the shoulder in the outer shell. Air holes are distributed on the front axial bearing and the rear axial bearing, and the air hole distribution density on the front axial bearing and the rear axial bearing is different. An air intake channel is provided in the outer shell, and a bearing air intake for supplying air to the air intake channel is provided outside the outer shell. A first front air intake and a first rear air intake for supplying air to the front axial bearing and the rear axial bearing are respectively provided on the bearing air intake, and the first front air intake and the first rear air intake are used to push the shoulder to oscillate at high frequency along the axial direction to drive the grinding wheel to grind the inner conical surface of the injector workpiece.

[0006] An X-axis support plate driven by an X-axis linear motor is arranged on the top of the X-axis air-floating guide rail, and the shaft seat is arranged on the top of the X-axis support plate.

[0007] The X-axis air-floating guide rail comprises a correspondingly arranged X-axis V-shaped air-floating guide rail and an X-axis parallel air-floating guide rail, and the X-axis linear motor is arranged between the X-axis V-shaped air-floating guide rail and the X-axis parallel air-floating guide rail.

[0008] A trimming shaft moving slide plate is provided on the side of the shaft seat, and a trimming shaft in sliding connection is provided on the trimming shaft moving slide plate.

[0009] The Z-axis air-floating guide rail is provided with a Z-axis linear motor for driving the Z-axis support plate to move on the Z-axis air-floating guide rail, and the top of the Z-axis support plate is provided with a grinding wheel spindle seat for installing a grinding wheel spindle.

[0010] The Z-axis air-floating guide rail comprises a correspondingly arranged Z-axis V-shaped air-floating guide rail and a Z-axis parallel air-floating guide rail, and the Z-axis linear motor is arranged between the Z-axis V-shaped air-floating guide rail and the Z-axis parallel air-floating guide rail.

[0011] The housing is provided with a front bearing and a rear bearing for supporting the rotating shaft, and air holes are distributed on the bearing bodies of the front bearing and the rear bearing.

[0012] The shell is provided with a second rear air intake and a second front air intake which are connected with the air intake passage respectively. The second rear air intake is used to supply air to the rear bearing, and the second front air intake is used to supply air to the front bearing.

[0013] Due to the adoption of the above technical solution, the utility model has the following beneficial effects:

[0014] The inner conical surface of the fuel injector workpiece is polished by replacing the existing grinding wheel shaft with an ultrasonic scribing air-static pressure electric spindle, and the shoulder is made to oscillate at high frequency along the axial direction by supplying air to the front axial bearing and the rear axial bearing. Since the pore distribution densities on the front axial bearing and the rear axial bearing are different, when the shoulder moves a distance from the axial bearing with large pore distribution density and blows air to the axial bearing with small pore distribution density, it will be blown back from the axial bearing with small pore density distribution to the axial bearing with large pore density distribution, thereby forming a dynamic balance to drive the rotating shaft and the grinding wheel to form high-frequency oscillation, so that the grinding wheel can not only rotate and grind, but also grind the inner conical surface of the fuel injector in the axial direction in a high-frequency oscillation manner, thereby solving the problem that the grinding wheel needs a lot of time to grind the inner conical surface of the fuel injector due to too low linear speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is the ultrasonic scribing gas static pressure electric spindle of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the fuel injection nozzle processed by the utility model;

[0018] Figure numerals: bed support 1; bed 2; X-axis V-shaped air-floating guide 3; X-axis linear motor 4; X-axis parallel air-floating guide 5; X-axis support plate 6; dressing axis 7; dressing axis moving slide 8; workpiece axis 9; axis seat 10; injector workpiece 11; grinding wheel axis seat 12; first grinding wheel axis 13; second grinding wheel axis 14; Z-axis support plate 15; Z-axis V-shaped air-floating guide 16; Z-axis linear motor 17; Z-axis parallel air-floating guide 18; first front air intake 19; first rear air intake 20; air intake channel 21; bearing air intake 22; motor 23; rotating shaft 24; rear axial bearing 25; shoulder 26; front axial bearing 27; grinding wheel 28; front bearing 29; rear bearing 30; second rear air intake 31; second front air intake 32. DETAILED DESCRIPTION

[0019] Since the inner cone, inner diameter and aperture of the processed fuel injector are small, the diameter of the grinding wheel used for grinding the inner cone of the fuel injector workpiece 11 is also small. The smaller the diameter of the grinding wheel, the smaller the linear speed of the grinding wheel when it rotates. Therefore, it is necessary to use an ultrasonic scribing air-static electric spindle to grind its inner cone. Since the ultrasonic scribing air-static electric spindle can drive the grinding wheel to oscillate axially at high frequency, when the ultrasonic scribing air-static electric spindle with a grinding wheel 28 enters the interior of the fuel injector workpiece 11, the grinding wheel 28 rotates and grinds the circumference of the fuel injector workpiece 11 while rotating. At the same time, the grinding wheel 28 can also perform an axial grinding when it oscillates axially at high frequency, so the inner cone of the fuel injector can be polished smooth more quickly.

[0020] like Figure 1 and Figure 2As shown, an ultra-precision internal grinding machine for grinding the conical surface of an oil injector comprises a bed 2, a bed support 1 is provided at the bottom of the bed 2, an X-axis air-floating guide rail and a Z-axis air-floating guide rail are respectively provided at the top of the bed 2, the motion trajectories of the X-axis air-floating guide rail and the Z-axis air-floating guide rail are perpendicular to each other and are T-shaped, the X-axis air-floating guide rail comprises an X-axis parallel air-floating guide rail 5 and an X-axis V-shaped air-floating guide rail 3, the X-axis parallel air-floating guide rail 5 and the X-axis V-shaped air-floating guide rail 3 are arranged in parallel, an X-axis linear motor 4 is provided between the X-axis parallel air-floating guide rail 5 and the X-axis V-shaped air-floating guide rail 3, an X-axis support plate 6 is provided on the X-axis parallel air-floating guide rail 5 and the X-axis V-shaped air-floating guide rail 3, and the X-axis linear motor 4 is used to drive the X-axis support plate 6 to slide on the X-axis parallel air-floating guide rail 5 and the X-axis V-shaped air-floating guide rail 3. The X-axis support plate 6 is provided with an axle seat 10, which is fixed to the X-axis support plate 6 by bolts, and the axle seat 10 is provided with a workpiece shaft 9, and the output end of the workpiece shaft 9 is used to fix the nozzle workpiece 11. A trimming shaft moving slide 8 is provided on the side of the axle seat 10, and a trimming shaft 7 is provided on the trimming shaft moving slide 8. The Z-axis air-floating guide rail includes a Z-axis V-shaped air-floating guide rail 16 and a Z-axis parallel air-floating guide rail 18 which are arranged in parallel and corresponding manner, a Z-axis linear motor 17 is provided between the Z-axis V-shaped air-floating guide rail 16 and the Z-axis parallel air-floating guide rail 18, a Z-axis support plate 15 which is slidably connected is provided on the Z-axis V-shaped air-floating guide rail 16 and the Z-axis parallel air-floating guide rail 18, and the Z-axis linear motor 17 is used to drive the Z-axis support plate 15 to slide on the Z-axis V-shaped air-floating guide rail 16 and the Z-axis parallel air-floating guide rail 18. Two grinding wheel shaft seats 12 are provided on the Z-axis support plate 15, and the two grinding wheel shaft seats 12 are respectively provided with a first grinding wheel shaft 13 and a second grinding wheel shaft 14. The first grinding wheel shaft 13 is mainly used to grind the outer surface of the nozzle workpiece 11, and the second grinding wheel shaft 14 is used to grind the inner conical surface of the nozzle workpiece 11. Figure 2As shown, the second grinding wheel shaft 14 adopts an ultrasonic scribing gas static pressure electric spindle. The ultrasonic scribing gas static pressure electric spindle can not only grind the inner ring of the fuel injection nozzle workpiece 11, but also grind it in the axial direction in a high-frequency oscillation manner. The ultrasonic scribing air-static electric spindle includes a shell, in which a rotating shaft 24 driven by a motor 23 is arranged. One end of the rotating shaft 24 is located inside the shell and driven by the power supply 23, and the other end of the rotating shaft 24 is an output end, which is located outside the shell. The output end of the rotating shaft 24 uses an original grinding wheel 28, and the rotating shaft 24 has a shoulder 26. A front axial bearing 27 and a rear axial bearing 25 are arranged on both sides of the shoulder in the shell. The front axial bearing 27 and the rear axial bearing 25 are both air bearings. The bearing bodies of the front axial bearing 27 and the rear axial bearing 25 are distributed with air holes, and the air hole densities on the front axial bearing 27 and the rear axial bearing 25 are different. A bearing air inlet 22 is arranged on the shell, and an air inlet channel 21 is arranged inside the shell. The bearing air inlet 22 is connected with the air inlet channel 21, and the bearing air inlet 22 is used to supply air to the air inlet channel 21. A first front air intake 19 and a first rear air intake 20 are provided inside the housing, and the first front air intake 19 and the first rear air intake 20 are connected to the front axial bearing 27 and the rear axial bearing 25 respectively. The first front air intake 19 and the first rear air intake 20 supply air to the front axial bearing 27 and the rear axial bearing 25 to make the shoulder 26 oscillate at a high frequency. Since the pore density distributions on the front axial bearing 27 and the rear axial bearing 25 are different, the strength of the air supply by the first front air intake 19 and the first rear air intake 20 is different. Therefore, when the shoulder 26 is blown by the side with a large pore density, it will move closer to the side with a small density. At the same time, when the shoulder 26 moves away from the side, the force will also decrease. When the shoulder 26 is away from the axial bearing with a small pore density, it will be blown by the axial bearing with a small pore density distribution and move to the other side, thereby forming a dynamic balance, thereby generating high-frequency oscillation in the axial direction. The high-frequency oscillation of the shoulder 26 can drive the rotating shaft 24 and the grinding wheel 28 installed on the rotating shaft 24 to oscillate at a high frequency, thereby achieving the effect of grinding the inner conical surface of the fuel injector. A front bearing 29 and a rear bearing 30 for supporting the rotating shaft 24 are provided in the housing. Air holes are distributed on the bearing bodies of the front bearing 29 and the rear bearing 30. The front bearing 29 and the rear bearing 30 are both air bearings. A second rear air intake 31 and a second front air intake 32 connected to the air intake channel 21 are respectively provided in the housing. The second rear air intake 31 is used to supply air to the rear bearing 30, and the second front air intake 32 is used to supply air to the front bearing 29, so as to form an air film on the rotating shaft 24 to support the rotation of the rotating shaft 24.

[0021] The specific use method of the utility model is as follows:

[0022] The fuel injector workpiece 11 is mounted on the workpiece shaft 9, and then the fuel injector workpiece 11 is ground. The shaft seat 10 is driven to move by the X-axis linear motor 4, and the Z-axis support plate is driven to move by the Z-axis linear motor 17, so as to move the fuel injector workpiece 11 and the grinding wheel shaft during operation. The first grinding wheel shaft 14 can grind the outer surface of the fuel injector workpiece 11. When it is necessary to grind the inner conical surface of the fuel injector workpiece 11, the second grinding wheel shaft 14 is used. The second grinding wheel shaft 14 adopts an ultrasonic scribing air static pressure electric spindle. The grinding wheel 28 on the spindle can not only grind the inner conical surface of the fuel injector workpiece 11, but also perform high-frequency oscillation in the axial direction during the grinding process, so that the ultrasonic scribing air static pressure electric spindle can grind the inner conical surface in the circumferential direction while grinding in the axial direction, so as to achieve the grinding of the inner conical surface of the fuel injector workpiece 11 when the linear velocity of the grinding wheel is close to zero.

Claims

1. An ultra-precision internal grinding machine for grinding the conical surface of an oil nozzle, comprising a bed (2) having a bed support (1), the top of the bed (2) being provided with an X-axis air-floating guide rail and a Z-axis air-floating guide rail with vertical motion trajectories, a shaft seat (10) being slidably connected to the X-axis air-floating guide rail, a workpiece shaft (9) for mounting an oil nozzle workpiece (11) being mounted on the shaft seat (10), and a grinding wheel shaft for grinding the oil nozzle workpiece (11) being slidably connected to the Z-axis air-floating guide rail, wherein: The number of the grinding wheel shafts is two, and they are respectively two parallel first grinding wheel shafts (13) and second grinding wheel shafts (14). The second grinding wheel shaft (14) is an ultrasonic scribing gas static pressure electric spindle. The ultrasonic scribing gas static pressure electric spindle comprises a rotating shaft (24) located in a housing and driven by a motor (23). A grinding wheel (28) is provided at the output end of the rotating shaft (24). The rotating shaft (24) has a shoulder (26). A front axial bearing (27) and a rear axial bearing (25) are respectively provided on both sides of the shoulder (26) in the housing. Air holes are distributed on the front axial bearing (27) and the rear axial bearing (25). The air holes on the front axial bearing (27) and the rear axial bearing (25) have different distribution densities. An air intake passage (21) is provided inside the housing. A bearing air intake (22) for supplying air to the air intake passage (21) is provided outside the housing. The bearing air intake (22) is provided with a first front air intake (19) and a first rear air intake (20) for supplying air to the front axial bearing (27) and the rear axial bearing (25), respectively. The first front air intake (19) and the first rear air intake (20) are used to push the shaft shoulder (26) to oscillate at high frequency along the axial direction to drive the grinding wheel (28) to grind the inner conical surface of the fuel injection nozzle workpiece (11).

2. The ultra-precision internal grinding machine for grinding the conical surface of the fuel injection nozzle according to claim 1 is characterized by: An X-axis support plate (6) driven by an X-axis linear motor (4) is arranged on the top of the X-axis air-floating guide rail, and the shaft seat (10) is arranged on the top of the X-axis support plate (6).

3. The ultra-precision internal grinding machine for grinding the conical surface of the fuel injection nozzle according to claim 2 is characterized by: The X-axis air-floating guide rail comprises a correspondingly arranged X-axis V-shaped air-floating guide rail (3) and an X-axis parallel air-floating guide rail (5), and the X-axis linear motor (4) is arranged between the X-axis V-shaped air-floating guide rail (3) and the X-axis parallel air-floating guide rail (5).

4. The ultra-precision internal grinding machine for grinding the conical surface of the fuel injection nozzle according to claim 1 is characterized by: A trimming shaft moving slide plate (8) is provided on the side of the shaft seat (10), and a trimming shaft (7) is provided on the trimming shaft moving slide plate (8) in sliding connection.

5. The ultra-precision internal grinding machine for grinding the conical surface of the fuel injection nozzle according to claim 1 is characterized by: The Z-axis air-floating guide rail is provided with a Z-axis linear motor (17) for driving the Z-axis support plate (15) to move on the Z-axis air-floating guide rail, and the top of the Z-axis support plate (15) is provided with a grinding wheel shaft seat (12) for mounting a grinding wheel shaft.

6. The ultra-precision internal grinding machine for grinding the conical surface of the fuel injection nozzle according to claim 5 is characterized by: The Z-axis air-floating guide rail comprises a Z-axis V-shaped air-floating guide rail (16) and a Z-axis parallel air-floating guide rail (18) which are arranged correspondingly, and the Z-axis linear motor (17) is arranged between the Z-axis V-shaped air-floating guide rail (16) and the Z-axis parallel air-floating guide rail (18).

7. The ultra-precision internal grinding machine for grinding the conical surface of the fuel injection nozzle according to claim 1 is characterized by: A front bearing (29) and a rear bearing (30) for supporting the rotating shaft (24) are arranged in the housing, and air holes are distributed on the bearing bodies of the front bearing (29) and the rear bearing (30).

8. The ultra-precision internal grinding machine for grinding the conical surface of the fuel injection nozzle according to claim 7 is characterized in that: A second rear air intake (31) and a second front air intake (32) which are connected to the air intake passage (21) are respectively arranged in the housing; the second rear air intake (31) is used to supply air to the rear bearing (30), and the second front air intake (32) is used to supply air to the front bearing (29).

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