JPH07164216A - Machining of parts assembled into engine - Google Patents

Abstract

PURPOSE:To improve machining accuracy by obtaining a difference between a target machining dimension and a machining dimension after assembly of parts into an engine body, adjusting the height of the reference plane of a supporting base and clamping pressure by a clamping means according to the difference. CONSTITUTION:In machining a part to be assembled into an engine, for example, a cam shaft housing (work) 26, the heights of the reference pads 52-54 of a supporting base 51 are set at prescribe heights, and a pressure for the work 26 to be clamped by clamp shafts 58-61 is set at a prescribed pressure, and the work 26 is held. In such a condition, mounting holes 31, 32 are ground, the work 26 after machining is assembled into a cylinder head 16, and its coaxial degree is measured. According to the magnitude of dislocation of the coaxial degree, the heights of the reference parts and the clamping pressure by the clamp shaft are adjusted by a control part 68. It is thus possible to machine the work 26 in such a condition that is almost identical to that when it is assembled into the cylinder head 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of machining an engine-assembled component such as a camshaft housing for machining an engine-assembled component.

[Prior art]

FIG. 9 shows an outline of a general engine, and FIG. 10 shows an outline of a method for processing a camshaft housing.

As shown in FIG. 9, a crankshaft 13 is rotatably supported by a cylinder block 12 of an engine body 11, and a base end portion of a connecting rod 14 is connected to the crankshaft 13 while a connecting rod is connected. 1
Pistons 15 are connected to the respective tip portions of the pistons 4. A combustion chamber 17 is formed in the cylinder head 16 fixed to the upper portion of the cylinder block 12 corresponding to each piston 15. An ignition plug 18 is attached to the combustion chamber 17, and the intake air communicating with the combustion chamber 17 is also installed. A port 19 and an exhaust port 20 are formed.

An intake valve 22 is attached to the intake port 19 and an intake pipe 21 is connected to the intake port 19, and a fuel injector 23 is attached to the intake port 19 of the intake pipe 21. On the other hand, an exhaust valve 24 is attached to the exhaust port 20 and an exhaust pipe 25 is connected to the exhaust port 20. Further, the intake valve 22 is attached to the camshaft housing 26 fixed to the upper portion of the cylinder head 16.
And a pair of camshafts 2 for operating the exhaust valve 24
7, 28 are attached.

Therefore, the air sucked from the air cleaner (not shown) flows into the intake port 19 through the intake pipe 21, while the fuel injector 23 injects a predetermined amount of fuel corresponding to the intake air amount into the intake port 19. Then, the intake air and the atomized fuel are mixed to form an air-fuel mixture, and the intake valve 22 is opened by the camshaft 27 to be sent into the combustion chamber 17 from the intake port 19. Here, the air-fuel mixture is instantly burned in the combustion chamber 17 and drives the piston 15 by the expansion gas pressure thereof. After that, the exhaust gas generated by the combustion is discharged from the exhaust port 20 to the outside by the exhaust pipe 25 when the exhaust valve 24 is opened by the camshaft 28.

In such an engine, the camshaft housing 26 that rotatably supports the pair of camshafts 27 and 28 is provided with mounting holes 31 and 32 for the camshafts 27 and 28 as shown in FIG. In addition, mounting portions 33, 34, 35, 36 for fixing to the cylinder head 16 are integrally formed on each side portion and the central portion.

The camshaft housing 26
Also, the bearing metal 29 at the tip portion is manufactured by aluminum die casting, the camshaft housing 26 is placed on the mounting base 41, and each mounting portion 3 is mounted by the multiple clamp shafts 42.
With the 3, 34, 35, 36 pressed down, boring arbor 44 having a plurality of cutting tools 43 is used for boring the mounting holes 31, 32.

[0008]

As described above, the camshaft housing 26 as described above has the mounting portions 33,
The boring arbor 44 performs boring processing of the mounting holes 31 and 32 in a state in which 34, 35 and 36 are pressed by a large number of clamp shafts 42. The thus processed camshaft housing 26 is fixed onto the cylinder head 16 via a gasket with a large number of fixing bolts. In this case, each fixing bolt is tightened with a predetermined axial force. However, the camshaft housing 26 is not so high in rigidity as a whole because the mounting holes 31 and 32, the mounting portions of the cams, and lightening for lightening the camshaft housing 26. Due to the tightening force, the camshaft housing 26 is slightly deformed, and the mounting hole 3
There was a problem that the coaxiality of 1, 32 was lowered. Then, the camshafts mounted in the mounting holes 31 and 32 cannot obtain proper rotational force.

The present invention solves such a problem, and an object of the present invention is to provide a method of processing an engine-assembled part with improved processing accuracy.

[0010]

In order to achieve the above-mentioned object, a method of machining an engine assembly part according to the present invention is a method for clamping an engine assembly part mounted on a reference surface of a support base by a clamping means. A method for processing an engine-assembled component, wherein the engine-assembled component is machined in a state where a plurality of fixed positions are clamped and held, in which a reference surface of the support base is set to a predetermined height and the engine is assembled by the clamp means. Machining the engine-assembled parts to the prescribed target machining dimensions under each setting condition where the clamping pressure of the components is set to the prescribed pressure, and assembling the engine-assembled components thus machined to the engine body to measure the machining dimensions. Then, the difference between the target processing size and the processing size after assembly is determined, and the height of the reference surface of the support base is adjusted and the clamping pressure by the clamping means is adjusted according to the difference. It is characterized in that to perform the machining of parts with the engine assembly Te.

[0011]

The operation is performed by obtaining the difference between the target processing size and the processing size after being assembled to the engine body, and adjusting the height of the reference surface of the support base according to the difference and adjusting the clamping pressure by the clamping means. By processing the assembly parts, the engine assembly parts are processed in substantially the same state as when assembled to the engine body.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration of a processing apparatus for carrying out a method of processing an engine assembly part according to an embodiment of the present invention, FIG. 2 is a front view of the processing support base, and FIG. 3 is a plan view of the processing support base. View, FIG. 4 is a partially cutaway front view of the clamp device, FIG. 5 is an explanation showing the setting conditions of the coaxiality test due to the clamp pressure change, and FIGS. 6 and 7 are graphs showing the results of the coaxiality test due to the clamp pressure change. FIG. 8 shows an explanation showing the adjustment amount of the reference surface height of the support base. It should be noted that the members having the same functions as those of the related art are designated by the same reference numerals, and the duplicate description will be omitted.

The machining apparatus for engine-assembled parts according to the present embodiment is applied to boring a camshaft mounting hole of a camshaft housing as an engine-assembled part. As shown in FIG. 1, the camshaft housing 26 as an engine assembly part is a reference pad 5 of the support base 51.
It is placed on 2, 53, 54 and this reference pad 5
2, 53 and 54 are reference surface height adjusting mechanisms 55 and 5 respectively.
The height can be adjusted by 6, 57. On the other hand, the clamp shafts 58, 59, 60 and 61 as clamp means for clamping and holding the respective mounting portions 33, 34, 35 and 36 of the camshaft housing 26 are axially movable by the clamp cylinders 62, 63 and 64, respectively. Each clamp cylinder 62,6
Pressure reducing valves 65, 66, 67 are connected to 3, 64 so that the clamp pressure can be adjusted.

The control unit 68 has a clamp pressure setting means 69 and a reference surface height setting means 70, and the clamp pressure setting means 69 responds to a difference between a target machining dimension described later and a machining dimension after assembly. The clamp pressure by the clamp shafts 58, 59, 60, 61 is adjusted to a predetermined value. On the other hand, the reference surface height setting means 70 controls the reference pads 52, 53, 54 of the support base 51 by the reference surface height adjusting mechanisms 55, 56, 57 according to the difference between the target processing dimension and the processing dimension after assembly. It adjusts the height.

Further, the control unit 68 measures the coaxiality sensors 71 and 72 when boring the cam shaft mounting holes 31 and 32 of the cam shaft housing 26 under predetermined setting conditions. Coaxiality measurement data of the mounting holes 31 and 32 is input. That is, the reference pads 52, 53, 54 of the support base 51 are set to a predetermined height and the clamp shafts 58, 59, 60, 6 are set.
The clamp pressure of the camshaft housing 26 by 1 is set to a predetermined pressure, and the mounting holes 31 and 32 of the camshaft housing 26 are ground to the target processing dimensions while the camshaft housing 26 is held under these setting conditions. Then, the processed camshaft housing 26 is fastened to the cylinder head 16 with the fixing bolts 30, and the coaxiality of the mounting holes 31 and 32 is measured by the coaxiality sensors 71 and 72, and the coaxiality measurement data is obtained. Output to 68. The clamp pressure setting means 69 of the control unit 68, based on this coaxiality measurement data, clamp shafts 58, 59, 60, 6
The clamp pressure of 1 is adjusted and set, while the reference surface height setting means 70 sets the reference pad 5 based on this coaxiality measurement data.
Adjust and set the height of 2, 53, 54.

After that, the clamp shafts 58, 59, 60, 6
When the adjustment of the clamp pressure of 1 and the height of the reference pads 52, 53, 54 is completed, the control unit 68 drives the boring arbor 44 as a processing device to grind the mounting holes 31, 32 of the camshaft housing 26. To do.

Here, the structure of the support base 51 and the reference surface height adjusting mechanisms 55, 56, 57 for adjusting the heights of the reference pads 52, 53, 54 of the support base 51, the clamp shaft 58,
Clamp cylinders 62, 63, 6 for adjusting the clamp pressure of the camshaft housing 26 by 59, 60, 61
4 and the like will be described.

As shown in FIGS. 2 and 3, the support base 51 has mounting portions 33a to 33 of the camshaft housing 26.
e, 34a to 34e, 35a to 35, 36a to 36e, reference pads 52a to 52e, 53a to 53e,
54a to 54e are attached to each reference pad 52a.
The heights of 52e, 53a to 53e, 54a to 54e can be adjusted independently by shims (not shown) as the reference surface height adjusting mechanisms 55, 56 and 57.

A positioning pin 7 for positioning the conveyed camshaft housing 26 is mounted on the support base 51.
A plurality of 1, 72 are provided so that they can appear and disappear freely. In other words, the drive rod 73 that projects downward is provided on the side of the support base 51.
Is attached to the hydraulic cylinder 74. The tip of the drive rod 73 is connected to the lower end of the operating rod 78 via the bell crank 75, the connecting rod 76 and the bell crank 77, and the upper end of the operating rod 78 is connected to the positioning pin 71 via the connecting link 79. Are linked to. Further, the lower end portion of the operating rod 78 has a bell crank 80.
Also, the lower end of the operating rod 83 is connected via the connecting rod 81 and the bell crank 82, and the upper end of the operating rod 83 is connected to the positioning pin 72 via the connecting link 84. Therefore, by driving the hydraulic cylinder 74, the positioning pins 71 and 72 can be synchronously projected and retracted.

As shown in FIG. 4, a horizontal support portion 92 is provided on a frame 91 extending above the support base 51. The horizontal support portion 92 has reference pads 52a to 52a.
Clamp cylinders 62, 63, 64 are attached corresponding to e, 53a to 53e, 54a to 54e. The clamp cylinders 62, 63, 64 have substantially the same structure, and a piston 94 is movably provided in the cylinder 93, and a drive shaft 95 is integrally fixed to the piston 94. Then, at the lower end of the drive shaft 95, the mounting portions 33a to 33e, 3 of the camshaft housing 26 are attached.
Clamp shafts 58, 59, 60, 61 are attached corresponding to 4a-34e, 35a-35, 36a-36e. In this case, the clamp cylinders 62 and 64 have one clamp shaft 58 and 61, respectively.
Two clamp shafts 59 and 60 are attached to the unit 3.

The drive shaft 95 of the clamp cylinder 62
The detecting portions 97, 98 are connected to the lower end of the
While the sensor 99,
100 is attached to the clamp shaft 5
The moving positions of 8, 59, 60, 61 are detected.

A concrete processing method by the processing apparatus for the engine-assembled parts of this embodiment will be described below. As shown in FIG. 1, first, the reference pads 52, 5 of the support base 51 are
3, 54 are set to the same predetermined height, and the clamp pressure of the cam shaft housing 26 by the clamp shafts 58, 59, 60, 61 is set as a setting condition 1 as shown in FIG. 62a to 62
e, 64a~64e at 50 kgf / cm ^2, setting the clamp cylinder 63a~63e and 56kgf / cm ^2. With the camshaft housing 26 held under the setting condition 1,
The mounting holes 31 and 32 are ground, the ground camshaft housing 26 is fastened to the cylinder head 16 with the fixing bolt 30, and the coaxiality of the mounting holes 31 and 32 is measured by the coaxiality sensors 71 and 72. .

Each mounting hole 3 ground under the set condition 1
The measurement result of the coaxiality of 1, 32 is as shown in FIG. 6, and in this graph, the mounting hole 31 is R and the mounting hole 32 is L.
And is measured at five positions with respect to the axial direction, and represents the deviation of the axial center between the horizontal direction and the vertical direction. That is, under the setting condition 1, both the mounting hole 31 (R) and the mounting hole 32 (L) are displaced to the L side and are displaced downward. In this way, it is analyzed that the camshaft housing 26 is held toward the R side during the grinding process under the setting condition 1, and as the setting condition 2, as shown in FIG. 5, only the clamp cylinders 62b, 62c and 62d are clamped. and 25.4kgf / cm ² to reduce the pressure, the clamp cylinders 62a, 62e, 50kgf / cm ² the clamping pressure of 64A～64e, the clamping pressure of the clamping cylinder 56kgf
Set it to / cm ² .

Under this setting condition 2, while holding the camshaft housing 26, the mounting holes 31 and 32 are ground, and the ground camshaft housing 26 is fastened to the cylinder head 16 with the fixing bolt 30. Again, the coaxiality of each of the mounting holes 31, 32 is determined by the coaxiality sensor 71,
Measure with 72. The measurement result of the coaxiality of each of the mounting holes 31 and 32 ground under the setting condition 2 is as shown in FIG. 7, and the mounting hole 32 (L) is displaced to the L side as in the setting condition 1. Although it is displaced downward with this, the amount of displacement is slightly reduced, while the mounting hole 31 (R) is substantially displaced in the horizontal direction.

Further, as setting conditions 3, 4 and 5, as shown in FIG. 5, clamp cylinders 62a to 62e and 63a are provided.
The clamping pressure of all of 63e and 64a to 64e is reduced. This is to grasp the amount of deformation of the entire camshaft housing 26 due to the clamp pressure. In this way, the mounting hole 31 (R) and the mounting hole 3 can be changed by changing the setting conditions.
How the coaxiality of 2 (L) changes is analyzed, and the clamp pressure is set based on the measured data. Actually, the clamp shafts 58, 5 are arranged so that this deviation appears in reverse.
The clamp pressures of 9, 60 and 61 may be set.

Further, in the measurement data by the above-mentioned coaxiality sensors 71 and 72, as shown in FIGS. 6 and 7,
In each of the concentricity, the central portion is shifted downward with respect to the longitudinal end portion. It is considered that this is because the surface of the camshaft housing 26 is elastically deformed because the camshaft housing 26 is made of an aluminum material and is soft, and as shown in FIG. The height of the is set high. Further, the height of the reference pad 54 is set higher than that of the reference pad 52 because it is determined that the amount of elastic deformation is large depending on the shape of the camshaft housing 26.

As described above, in the processing method of the engine assembly part of this embodiment, the reference pads 52 and 5 of the support base 51 are formed.
The height of 3, 54 is set to a predetermined height, and the cam shaft housing 26 is held under a plurality of setting conditions in which the clamp pressure of the cam shaft housing 26 by the clamp shafts 58, 59, 60, 61 is set to a predetermined pressure. In that state, the mounting holes 31 and 32 are ground, the processed camshaft housing 26 is assembled to the cylinder head 16, the coaxiality thereof is measured, and the reference pads 52, 53 and 54 are adjusted by the deviation of the coaxiality. Height and clamp shafts 58, 59,
By adjusting the clamping pressure by 60 and 61, the camshaft housing 26 can be machined in a state substantially close to the state of being assembled to the cylinder head 16. Therefore, the respective mounting holes 31, 3 of the camshaft housing 26
When No. 2 is attached to the cylinder head 16, its coaxiality becomes almost proper.

[0029]

As described above in detail with reference to the embodiments, according to the method for processing an engine-assembled component of the present invention, the reference surface of the support table on which the engine-assembled component is mounted has a predetermined height. Is set and the clamping pressure of the engine assembly component by the clamp means is set to a predetermined pressure, the engine assembly component is machined to a predetermined target machining dimension, and the machined engine assembly component is processed. Measure the machining dimensions by assembling to the machine, find the difference between the target machining dimension and the machining dimension after assembly, and adjust the height of the reference surface of the support base according to the difference and adjust the clamping pressure by the clamping means. Since the engine assembly parts are machined, the engine assembly parts can be machined in a state close to the state where they are assembled to the engine body. When assembled to become almost a fair accuracy, it is possible to improve the machining accuracy of the engine assembly member.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a processing apparatus for carrying out a method of processing an engine assembly part according to an embodiment of the present invention.

FIG. 2 is a front view of a processing support base.

FIG. 3 is a plan view of a processing support base.

FIG. 4 is a partially cutaway front view of the clamp device.

FIG. 5 is an explanatory diagram showing setting conditions for a coaxiality test based on a change in clamp pressure.

FIG. 6 is a graph showing a result of a coaxiality test by changing a clamp pressure.

FIG. 7 is a graph showing a result of a coaxiality test by changing clamp pressure.

FIG. 8 is an explanatory diagram illustrating an adjustment amount of a reference surface height of a support base.

FIG. 9 is a schematic diagram of a general engine.

FIG. 10 is a schematic view illustrating a method for processing the camshaft housing.

[Explanation of symbols]

 16 Cylinder Head 26 Cam Shaft Housing 27, 28 Cam Shaft 30 Fixing Bolt 31, 32 B Mounting Hole 33, 34, 35, 36 Mounting Part 51 Support Base 52, 53, 54 Reference Pad 55, 56, 57 Reference Height Adjustment Mechanism 58, 59, 60, 61 Clamp shaft 62, 63, 64 Clamp cylinder 65, 66, 67 Pressure reducing valve 68 Control section 69 Clamp pressure setting means 70 Reference surface height setting means

Claims (1)

[Claims] 1. An engine assembling component for processing the engine assembling component in a state in which a plurality of fixing positions are clamped and held by the clamping means with respect to the engine assembling component placed on the reference surface of the support base. In the processing method, the reference surface of the support base is set to a predetermined height, and the clamping pressure of the engine assembly component by the clamping means is set to a predetermined pressure. After processing to the processing size, the processed engine assembly parts are assembled to the engine body, the processing size is measured, the difference between the target processing size and the processing size after assembly is obtained, and according to the difference The engine mounting member is characterized in that the height of the reference surface of the support base is adjusted and the clamping pressure by the clamping means is adjusted to process the engine mounting component. Processing method.