JP2001271702A - Blast method of cylinder block and blast device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure lubricity at a portion requiring scuff resistance and abrasion resistance of cylinder bores, to realize reduction of consumption of lubricant oil and friction in a piston sliding portion and decrease of discharge amount of high carbon produced along therewith, and to reduce cycle time of blast- processing. SOLUTION: When blast-processing is carried out for a cylinder bore CB of a cylinder block C, a blast material 8 is blasted only on a thrust receiving side L or an anti-thrust side R receiving a slide thrust from a piston, in the vicinity of a top dead center Pu of the piston of the cylinder bore CB.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for blasting a cylinder block used for blasting a cylinder bore of a cylinder block.

[0002]

2. Description of the Related Art Conventionally, when blasting is performed on a cylinder bore of a cylinder block, for example, the blast processing is performed on a cylinder bore of a cylinder block set with a mating surface with a cylinder head facing upward and an axis along a vertical direction. The entire surface of the cylinder bore is blasted by inserting a nozzle and lowering the blast material while ejecting the blast material from a blast nozzle rotated about an axis in the cylinder bore. (JP-A-11-32
0414)

[0003]

However, in the prior art, although the scuff resistance between the cylinder bore and the piston can be ensured, the entire surface of the cylinder bore is formed as a rough surface by performing blasting. As a result, in addition to the increase in the consumption of lubricating oil in the sliding portion of the piston and the increase in friction, the problem that the amount of high-carbon emissions also increases with the increase in the consumption of lubricating oil. Had.

[0004] In addition, it is difficult to keep the surface roughness constant, and there is a problem that the cycle time becomes longer because of the blast processing on the entire surface of the cylinder bore.

Further, in the blasting apparatus used for the blasting, the blast material sprayed on the cylinder bore is collected from the crankcase side of the cylinder block. When the blasting material easily enters the recesses such as the oil supply holes of the block, and the process for removing these blasting materials is required, so the work cost increases and the blasting material cannot be completely removed. In addition, there is a problem that the equipment cost increases as the device becomes larger, and it is a conventional problem to solve these problems. I was

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. The present invention has been made in consideration of ensuring lubrication in a portion of a cylinder bore where scuff resistance and abrasion resistance are required, and a piston sliding. Provided is a method of blasting a cylinder block, which is capable of realizing a reduction in lubricating oil consumption and friction in a portion and a reduction in a high carbon emission associated therewith, and a reduction in cycle time of blasting. And even if the particle size of the blasting material is reduced, the blasting material can be completely removed, and as a result, the operation cost is reduced by the amount that the step of removing the blasting material can be omitted. In addition, it is possible to reduce the size of the device, thereby increasing the degree of freedom in layout and reducing equipment costs. And its object is to provide a blasting apparatus which is capacity.

[0007]

According to a first aspect of the present invention, when blasting a cylinder bore of a cylinder block, a side thrust near the top dead center of the piston of the cylinder bore is received from the piston when blasting the cylinder bore of the cylinder block. The blast material is sprayed only on the thrust receiving side and the opposite thrust receiving side, and such a configuration of the blasting method of the cylinder block is a means for solving the above-mentioned conventional problem.

According to a second aspect of the present invention, there is provided a method for blasting a cylinder block, wherein the blast material has a particle diameter of at least 4 mm.
The blast material has a particle size of 40 to 50 μm.

According to a third aspect of the present invention, in the method for blasting a cylinder block, the surface roughness of the portion to which the blast material is sprayed is Ra 0.15 to 1.0 μm, and the surface roughness of the portion to which the blast material is not sprayed is Ra0. .1 μm or less, more preferably, the surface roughness of the part to which the blast material is sprayed is about Ra 0.3 μm, and the surface roughness of the part to which the blast material is not sprayed is about Ra 0.07 μm.
And

On the other hand, a blast device according to claim 4 of the present invention has a cylindrical main body inserted from above into a cylinder bore of a cylinder block set with a piston top dead center facing upward, and provided on the main body. A slit near the piston top dead center of the cylinder bore and opening toward the thrust receiving side and the anti-thrust receiving side receiving the side thrust from the piston, a sealing material provided on the main body and contacting the cylinder bore on the upper and lower sides of the slit; and the main body. The blast device is characterized in that it is provided with a nozzle that is set to be rotatable substantially about the axis and that ejects the blast material sent from the blast material supply source to the outside of the main body through the slit. Is a means for solving the above-mentioned conventional problem.

[0011] In a blast apparatus according to a fifth aspect of the present invention, the main body has a bottom and a mechanism for collecting a blast material collected on the bottom of the main body, and the blast apparatus according to a sixth aspect of the present invention. In the device, the collection mechanism is:
The apparatus is provided with a recovery pipe inserted into the main body, and a recovery pump for sucking the blast material collected at the bottom of the main body through the recovery pipe.

[0012]

According to the method for blasting a cylinder block according to the first aspect of the present invention, when blasting is performed on a cylinder bore of a cylinder block, a thrust receiving side near a piston top dead center of the cylinder bore and receiving a side thrust from the piston is provided. Since the blast material is sprayed only on the anti-thrust receiving side, the surface roughness and hardness of the cylinder bore where the scuff resistance and wear resistance are required, that is, in the vicinity of the piston top dead center of the cylinder bore, are reduced. Will be secured,
Excellent lubricity will be obtained, while the mirror sliding state will be maintained in the piston sliding portion, that is, in the portion of the cylinder bore except for the portion near the piston top dead center, and as a result, the thickness of the lubricating oil film will be reduced. As a result, the amount of lubricating oil consumed is reduced, and friction is reduced.As a result, the amount of high-carbon emissions is reduced. , The cycle time of blasting is reduced.

[0013] In the method for blasting a cylinder block according to the second aspect of the present invention, the above-described configuration is provided.
The rough surface can be formed without damaging the graphite of the solid lubricant in the cylinder bore of the cast iron cylinder block, and the cylinder block blasting method according to claim 3 of the present invention has the above-described configuration.
Further improvement in lubricity near the piston top dead center of the cylinder bore, reduction of lubricating oil consumption and friction in the sliding part of the piston, and reduction of high carbon emissions associated therewith. Becomes

In the blasting device according to the fourth aspect of the present invention, when the nozzle is rotated about the central axis in the main body while ejecting the blasting material sent from the blasting material supply source, the blasting material passes through the slit through the cylinder bore. In the vicinity of the piston top dead center, and only on the thrust receiving side that receives side thrust from the piston and the anti-thrust receiving side, in the portion near the piston top dead center of the cylinder bore where scuff resistance and wear resistance are required, Surface lubrication and hardness are ensured and excellent lubrication is achieved, while the piston sliding portion of the cylinder bore except for the vicinity of the piston top dead center is maintained in a mirror state,
Reduction of lubricating oil consumption and friction, and reduction of high-carbon emissions associated with these reductions. In addition, blasting is not performed on the entire surface of the cylinder bore, thereby shortening the cycle time of blasting. Will be achieved.

[0015] In the blasting device according to claim 5 of the present invention, the blast material can be completely removed even if the particle size of the blast material is reduced, since the blast material is configured as described above. The operation cost can be reduced as much as the removal step can be omitted. In addition to the downsizing of the device, the degree of freedom of layout is increased and the equipment cost is greatly reduced.

In the blasting device according to claim 6 of the present invention, since the blasting device is configured as described above, the blasting material can be completely removed without complicating the structure.

[0017]

According to the method for blasting a cylinder block according to the first aspect of the present invention, since the above-described structure is employed, the surface roughness and the sufficient lubricity required for the portion of the cylinder bore near the piston top dead center can be obtained. Hardness can be ensured, and it is possible to reduce the consumption of lubricating oil at the sliding part of the piston, reduce the friction, and reduce the emission of high carbon accompanying these. A very excellent effect that the cycle time can be shortened is provided.

In the cylinder block blasting method according to the second aspect of the present invention, since the above-described configuration is employed,
In addition to obtaining the same effect as the cylinder block blasting method according to the first aspect, the present invention eliminates microburrs on the bore surface without damaging the solid lubricant graphite in the cylinder bore of the cast iron cylinder block. Thereby, a very excellent effect that a rough surface can be formed is brought about.

In the method for blasting a cylinder block according to a third aspect of the present invention, since the above-described configuration is employed, it is possible to further improve the lubricity in the portion near the top dead center of the piston of the cylinder bore, and to realize the piston sliding. It is possible to further reduce the consumption of lubricating oil in the moving part and to significantly reduce friction, and furthermore, it is possible to achieve a very excellent effect that the emission of high carbon can be significantly reduced.

On the other hand, in the blast device according to claim 4 of the present invention, since the blast device is configured as described above, the surface roughness and hardness sufficient to obtain the required lubricity in the vicinity of the piston top dead center of the cylinder bore are ensured. In addition to this, it is possible to reduce the consumption of lubricating oil and friction at the sliding part of the piston, and to reduce the emission of high carbon associated with this, and also to shorten the cycle time of blasting Is very advantageous.

[0021] In the blast device according to claim 5 of the present invention, since the blast device has the above-described configuration, it is possible to reduce the working cost in addition to reducing the working cost, and as a result, It is possible to increase the degree of freedom of the layout and reduce the equipment cost. In the blast device according to the sixth aspect of the present invention, since the blast device has the above-described configuration, it is possible to completely remove the blast material with a simple structure. Is very advantageous.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a view for explaining a method of blasting a cylinder block according to an embodiment of the present invention, and FIG. 2 is a blast apparatus used in the method of blasting a cylinder block according to the present invention, that is, a blast according to the present invention. 1 shows an embodiment of the device.

As shown in FIG. 2, the blast device 1
Is a hydraulic cylinder 2 located above a cylinder block C set with the piston top dead center Pu up, and is lowered by the operation of the hydraulic cylinder 2 to be inserted into a cylinder bore CB of the cylinder block C from above and clamped. A main body 3 having a cylindrical shape which is raised together with the cylinder bore CB and is separated from the cylinder bore CB; a slit 4 provided in the main body 3;
A nozzle 9 is provided for injecting a blast material 8 sent from a blast material supply source 6 through a supply pipe 7 together with compressed air generated by a supply pump 5 to the outside of the main body 3 through the slit 4. The output of a motor 11 provided on a plate 10 located on the upper part of the main body 3 is supplied to the nozzle 9 via a pinion 12 and a spur gear 13 fitted on the nozzle 9.
, It is rotatable about the central axis inside the main body 3.

In this case, the slit 4 provided in the main body 3
As shown in FIGS. 1A to 1C, a thrust receiving side near the top dead center Pu of the piston P that slides in the cylinder bore CB during operation of the engine and receives a side thrust from the piston P (FIG. ), And open to the anti-thrust receiving side (lower side of the crankshaft Cr in FIG. 1A) R.

That is, only the thrust receiving side L and the anti-thrust receiving side R near the piston top dead center Pu of the cylinder bore CB and receiving a load (side thrust) by the combustion pressure, the blast material 8 having a particle size of 40 μm or more from the nozzle 9. The surface roughness Ra 0.15 to 1 that satisfies the scuff resistance and the wear resistance in the vicinity of the piston top dead center Pb of the cylinder bore CB where the scuff resistance and the wear resistance are required. 0.0μ
m and hardness so as to obtain excellent lubrication between the piston ring Pr and the sliding surface of the piston P except for a portion near the piston top dead center Pu of the cylinder bore CB. Ra is maintained at 0.1 μm or less so as to reduce the consumption of lubricating oil, reduce friction, and reduce the emission of high carbon accompanying these.

The blasting apparatus 1 has a collecting mechanism 20 for collecting the blast material 8 collected on the bottom 3 a of the main body 3.
And a collection pump 23 which sucks the blast material 8 collected on the bottom 3a of the main body 3 to form a collection tank 22 through the collection tube 21.

Further, the blasting device 1 has a sealing material 14 on the flange 3b of the main body 3 to which the plate 10 is attached.
And a main body 3 as shown in FIG.
A seal member 14 is provided on the upper and lower sides of the slit 4 so that any of the seal members 14 comes into contact with the cylinder block C or the cylinder bore CB so as to prevent the blast material 8 from falling down below the cylinder bore CB. Has become.

When performing blasting of the cylinder bore CB of the cylinder block C by the above-described blast device 1, first, the cylinder block C is set on the jig 19 with the piston top dead center Pu up, and then the hydraulic pressure is increased. The main body 3 is lowered by operating the cylinder 2, inserted into the cylinder bore CB of the cylinder block C from above, and clamped.

Next, the blast material 8 having a particle diameter of 40 μm or more sent from the blast material supply source 6 through the supply pipe 7 together with the compressed air generated by the supply pump 5 is jetted out.
When the motor 11 is operated to rotate the nozzle 9 substantially around the axis inside the main body 3, the blast material 8 blows out of the main body 3 through the slit 4.

At this time, the slit 4 is located at the top dead center P of the piston P which slides in the cylinder bore CB during the operation of the engine.
u, and opens toward the thrust receiving side L and the anti-thrust receiving side R for receiving the side thrust from the piston P, the blast material 8 is sprayed only on the above-mentioned predetermined portion, and therefore, In the portion near the piston top dead center Pu of the cylinder bore CB where scuffing and wear resistance are required, the surface roughness Ra 0.15
The range of about 1.0 μm is secured and the hardness is secured, so that excellent lubricity is obtained.

On the other hand, since the blast material 8 is not sprayed on the sliding portion of the piston P except for the portion near the piston top dead center Pu of the cylinder bore CB, the surface roughness Ra
0.1 μm or less is maintained, that is, the mirror surface state is maintained, so that reduction of lubricating oil consumption and friction and reduction of high carbon emission associated therewith are achieved.

When the blast processing for the above-mentioned predetermined portion is completed, the operations of the supply pump 5 and the motor 11 are stopped, and then the recovery pump 23 of the recovery mechanism 20 is operated to move the recovery pipe 21. The blast material 8 collected on the bottom 3a of the main body 3 is sucked through the collection tank 22
To be collected.

As described above, in the blasting method using the blasting device 1, since the blasting is not performed on the entire surface of the cylinder bore CB, the cycle time of the blasting can be shortened. Since the blast material 8 has a particle size of 40 μm or more, as shown in FIG. 1 (d), it does not damage the graphite G of the solid lubricant in the cylinder bore CB of the cylinder block C made of cast iron. A surface can be formed.

Further, in the above-described blasting apparatus 1, since the blast material 8 is collected at the bottom 3a of the main body 3 and is recovered by the recovery mechanism 20, the blast material 8 may have a particle size of about 40 μm. Even if the blast material 8 can be completely removed, the operation cost can be reduced by the amount of the step of removing the blast material 8 can be omitted, and the layout can be reduced as the whole apparatus 1 is downsized. This increases the degree of freedom and greatly reduces equipment costs.

Further, in the blasting apparatus 1, since the collecting mechanism 20 is mainly composed of the collecting pipe 21 and the collecting pump 23 for sucking the blast material 8 through the collecting pipe 21, the structure is simple. The blast material 8 can be completely removed.

The detailed structure of the blasting method and the blasting device for the cylinder block according to the present invention is not limited to the above-described embodiment.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a cylinder block to which a method of blasting a cylinder block according to an embodiment of the present invention is applied (a), a partial cross-sectional view of a cylinder block (b), and a portion of a cylinder bore near a piston top dead center; FIG. 6C is an enlarged sectional explanatory view (c) of FIG. 5 and an enlarged sectional explanatory view (d) of the surface of the cylinder bore.

FIGS. 2A and 2B are an explanatory view of an entire configuration of a blast device used for a blasting method of a cylinder block according to an embodiment of the present invention, and an explanatory sectional view taken along line AA of FIG. 2A.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blast apparatus 3 Main body 3a Bottom part of main body 4 Slit 6 Blast material supply source 8 Blast material 9 Nozzle 14 Seal material 20 Blast material recovery mechanism 21 Recovery pipe 23 Recovery pump C Cylinder block CB Cylinder bore L Thrust receiving side P Piston Pu On piston Dead center R Anti-thrust receiving side

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16J 10/02 F16J 10/02 Z

Claims (6)

[Claims] When blasting is performed on a cylinder bore of a cylinder block, a blast material is sprayed only on a thrust receiving side receiving a side thrust from a piston near a piston top dead center of the cylinder bore and an anti-thrust receiving side. Blasting method of cylinder block. 2. The blast material has a particle size of at least 40 μm.
The method for blasting a cylinder block according to claim 1. 3. The method according to claim 1, wherein the surface roughness of the portion to which the blast material is sprayed is Ra 0.15 to 1.0 μm, and the surface roughness of the portion to which the blast material is not sprayed is Ra 0.1 μm or less. Blasting method of cylinder block. 4. A cylindrical body inserted from above into a cylinder bore of a cylinder block set with a piston top dead center facing up, and a cylinder bore provided in the body near the piston top dead center of the cylinder bore and side from the piston. A slit that opens toward the thrust receiving side and the anti-thrust receiving side that receives the thrust, a sealing material that is provided on the main body and contacts the cylinder bore on the upper and lower sides of the slit, and is set inside the main body so as to be rotatable about a substantially axial center. A blasting device provided with a nozzle for ejecting the blasting material sent from the blasting material supply source to the outside of the main body through the slit. 5. The blasting apparatus according to claim 4, wherein the main body has a bottom, and a blast material collecting mechanism for collecting the blast material collected on the bottom of the main body. 6. The blasting apparatus according to claim 5, wherein the collecting mechanism includes a collecting pipe inserted into the main body, and a collecting pump for sucking the blast material collected at the bottom of the main body through the collecting pipe.