JP3310352B2 - Cylinder block processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head joint surface of a cylinder block of an engine of a vehicle or the like, which is a surface joined to a cylinder head, and a smooth inner surface of a sleeve provided in the cylinder block. And a method for processing a cylinder block.

[0002]

2. Description of the Related Art In general, a cylinder of a vehicle engine is divided into a cylinder block enclosing a piston and a cylinder head having a combustion chamber, a valve mechanism and the like, and an oil pan serving as a pool of lubricating oil is provided at a lowermost portion. The cylinder block and the cylinder head are connected by bolts, but a gasket is inserted and tightened so that gas does not leak from the joint surface. Therefore, the cylinder head joint surface of the cylinder block, which is the joint surface with the cylinder head, is required to be a smooth plane.
Further, a sleeve in which the piston slides is provided in the cylinder block, and the inner peripheral surface of the sleeve is required to have a smooth and smooth curved surface in order to smoothly slide the piston. Is done.

[0003] Conventionally, the processing of the cylinder head joint surface and the inner peripheral surface of the sleeve as described above has been performed as follows. FIG. 3 shows a cross section of one of the four cylinders of the cylinder block body 1 shown in FIG. FIG. 3 is a view showing a step of processing the conventional cylinder head joining surface and the inner peripheral surface of the sleeve, and FIG. 3 shows steps (a), (b), (c), (d), and (e). Become.

In FIG. 1A, reference numeral 1 denotes a cylinder block main body, and a sleeve 2 is embedded in the cylinder block main body 1 integrally. In this step (a), the rough machining chip 5 attached to the flat milling cutter 4 of the milling machine is brought into contact with the cylinder head joining surface 3 on the upper surface of the cylinder block 1 where the opening 2a of the sleeve 2 is located. Then, the flat milling machine 4 is rotated to perform rough machining for roughly cutting the cylinder head joint surface 3.

[0005] Next, in the step (b), the chip 5 for rough machining attached to the flat milling cutter 4 is replaced with a chip 6 for finishing machining, and the flat milling cutter 4 is rotated.
Is brought into contact with the cylinder head joint surface 3, and the cylinder head joint surface 3 is finely cut.
After this processing, the cylinder head joining surface 3 becomes a smooth flat surface.

Next, in (c), the tool holder 9 with the roughing tip 8 attached to the equipment is in contact with the inner peripheral surface 7 of the sleeve 2. In the step (c), the blade holder 9 is rotated, the blade holder 9 is inserted into the sleeve 2, and the chip 8 attached to the blade holder 9 comes into contact with the inner peripheral surface 7 of the sleeve 2. Roughing is performed to roughly cut the inner peripheral surface 7. Next, in the step (d), the roughing chip 8 attached to the blade holder 9 is replaced with a finishing chip 10, the blade holder 9 is rotated and inserted into the sleeve 2, and the chip 10 is inserted into the sleeve 2. 2 is finished by abutting on the inner peripheral surface 7 to finely cut the inner peripheral surface 7.

In the last part (e), reference numeral 11 denotes a honing tool for performing honing processing, and a grindstone 12 of the honing tool 11 is in contact with the inner peripheral surface 7 of the sleeve 2. In the step (e), the honing tool 1
1 is rotated and inserted into the sleeve 2, and the grindstone 12 of the honing tool 11 abuts on the inner peripheral surface 7 of the sleeve 2, and the polishing is performed more finely than the finishing performed in the step (d) described above. Honing processing is performed on the inner peripheral surface 7. After this operation, the inner peripheral surface 7 of the sleeve 2 becomes a smooth surface.

[0008]

However, when the sleeve is machined after finishing the joining surface of the cylinder head, there are the following problems. If the inner peripheral surface of the sleeve is processed after the cylinder head joining surface is made a smooth plane, the cylinder head joining surface may be extremely fine but may be distorted. When the above-mentioned problem occurs, it is necessary to rework the cylinder head joint surface, which takes time and labor, and causes a reduction in work efficiency.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a processing step which does not require reworking even when distortion occurs in a cylinder head joint surface during processing of an inner peripheral surface of a sleeve. The purpose is.

[0010]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a method for manufacturing a cylinder block in which an opening of the sleeve is located, after casting a cylinder block with a sleeve inside. In addition, after performing roughing, finishing, and honing of the inner peripheral surface of the sleeve, finishing of the cylinder head joint surface is performed.

[0011]

In the method for processing a cylinder block according to the present invention, first, roughing is performed on the joint surface of the cylinder head, then roughing is performed on the inner circumferential surface of the sleeve, and then finishing is performed on the inner circumferential surface of the sleeve. Next, the inner peripheral surface of the sleeve is subjected to honing processing, and further, the cylinder head joining surface finishing processing is performed. Even if minute distortion occurs in the cylinder head joint surface by the end of the honing of the inner peripheral surface of the sleeve, this distortion does not remain due to the subsequent cylinder head joint surface finishing.

[0012]

An embodiment of the present invention will be described with reference to FIG. Further, the reference numerals used here are the same as those of the conventional example, and the description of the reference numerals is simplified. (A) in the figure,
(B), (c), (d), and (e) show the steps of processing the cylinder head joint surface and the sleeve inner peripheral surface.

First, in the step (a), the flat milling machine 4 of the milling machine is rotated, and the rough machining chip 5 attached to the flat milling machine 4 is brought into contact with the cylinder head joining surface 3.
, Rough cutting for roughly cutting the cylinder head joint surface 3 is performed. Next, in the step (b), the blade holder 9 is attached to the equipment, and the blade holder 9 is rotated. Further, the cutting tool holder 9 is inserted into the sleeve 2, and the roughing chip 8 attached to the cutting tool holder 9 abuts on the inner peripheral surface 7 of the sleeve 2, and the chip 8 roughly cuts the inner peripheral surface 7. Perform roughing.

Next, in the step (c), the rough cutting tip 8 attached to the cutting tool holder 9 is replaced with the finishing cutting tip 10, and the cutting tool holder 9 is rotated. Further, the blade holder 9 is inserted into the sleeve 2, and the finishing chip 10 attached to the blade holder 9 abuts on the inner peripheral surface 7 of the sleeve 2, and the chip 10 cuts the inner peripheral surface 7 finely. Perform the finishing process.
Next, in the step (d), the honing tool 11 attached to the honing machine is rotated, the grindstone 12 of the honing tool 11 is inserted into the sleeve 2, and the inner peripheral surface 7 of the sleeve 2 is polished. Perform the process.
After this step, the inner peripheral surface 7 of the sleeve 2 becomes a smooth surface.

Finally, in the step (e), a chip 6 for finishing is mounted on the flat milling machine 4 of the milling machine, the flat milling machine 4 is rotated, and the chip 6 comes into contact with the cylinder head joining surface 3. A finishing process for finely cutting the joint surface 3 is performed. After this step, the cylinder head joining surface 3 becomes a smooth surface.

According to the cylinder block processing method of this embodiment, first, the cylinder head joint surface 3 is rough-processed in the step (a). Next, in the step (b), the sleeve 2
The inner peripheral surface 7 of the sleeve 2 is roughed, the inner peripheral surface 7 of the sleeve 2 is finished in the step (c), and the inner peripheral surface 7 of the sleeve 2 is honed in the step (d). Inner circumferential surface 7
Is completed. Finally, in step (e), the cylinder head joint surface 3 is finished, and the processing of the cylinder head joint surface 3 is completed. From the above, even if the cylinder head joint surface 3 is distorted while the inner peripheral surface 7 of the sleeve 2 is being machined, since the cylinder head joint surface 3 is finished in the last step, the cylinder head joint surface 3 is finished. No distortion remains on the head bonding surface 3, and a high flatness of, for example, 2 to 3 μm can be obtained. This eliminates the need for time and labor for reworking the cylinder head joint surface 3 due to distortion remaining in the cylinder head joint surface 3, and does not cause a reduction in work efficiency.

[0017]

According to the cylinder block machining method of the present invention, first, rough machining of the cylinder head joint surface is performed, then, rough machining of the sleeve inner peripheral surface is performed, and then,
Finishing of the inner peripheral surface of the sleeve is performed, then, honing of the inner peripheral surface of the sleeve is performed, and finally, finishing of the joining surface of the cylinder head is performed to complete. In the processing step of the cylinder block, since the processing of the cylinder head joint surface is completed after all the processing of the sleeve inner peripheral surface is completed, it is assumed that the cylinder head joint surface is distorted during the processing of the sleeve inner peripheral surface. Also, by the final finishing of the cylinder head joint surface,
No distortion remains on the cylinder head joint surface. As a result, distortion remains in the joint surface of the cylinder head, and the time and labor for reworking the joint surface of the cylinder head are not required, and the working efficiency is not reduced.

[Brief description of the drawings]

FIG. 1 is a view showing processing steps of a method for processing a cylinder block according to one embodiment of the present invention. (A) is a longitudinal sectional view showing a rough machining step of a cylinder head joint surface, (b) is a longitudinal sectional view showing a rough machining step of a sleeve inner peripheral face, and (c) is a finish machining step of a sleeve inner peripheral face. Longitudinal sectional view, (d) is a longitudinal sectional view showing a honing process of the inner peripheral surface of the sleeve,
(E) is a longitudinal sectional view showing a finishing step of the cylinder head joining surface.

FIG. 2 is a perspective view showing a cylinder block.

FIG. 3 is a view showing a processing step of a conventional cylinder block processing method. (A) is a longitudinal sectional view showing a roughing step of the cylinder head joining surface, (b) is a longitudinal sectional view showing a finishing step of the cylinder head joining surface, and (c) is a roughing step of the inner peripheral surface of the sleeve. FIG. 4D is a longitudinal sectional view showing a finishing step of the inner peripheral surface of the sleeve, and FIG. 4E is a longitudinal sectional view showing a honing step of the inner peripheral surface of the sleeve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Sleeve 2a Opening 3 Cylinder head joint surface 7 Inner peripheral surface

Claims (1)

(57) [Claims] After a cylinder block is cast with a sleeve inside, a cylinder head joint surface where an opening of the sleeve is located is rough-processed, and roughing, finishing, and honing of an inner peripheral surface of the sleeve are performed. A method for processing a cylinder block, comprising: after finishing, finishing a joining surface of a cylinder head.