CN109014769B - Method for repairing coaxiality of crankshaft hole - Google Patents
Method for repairing coaxiality of crankshaft hole Download PDFInfo
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- CN109014769B CN109014769B CN201810904386.7A CN201810904386A CN109014769B CN 109014769 B CN109014769 B CN 109014769B CN 201810904386 A CN201810904386 A CN 201810904386A CN 109014769 B CN109014769 B CN 109014769B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention provides a crankshaft hole coaxiality repairing method. The crankshaft hole coaxiality repairing method provided by the invention comprises the following steps: the method comprises the steps of firstly removing a bolt group between a machine body and a tile cover to separate the machine body and the tile cover, then grinding a first surface of the tile cover to form a second surface so that the second surfaces of all the tile covers are equal in height, then mounting the ground tile cover to the machine body through the bolt group again to form an elliptical hole, and finally boring the elliptical hole according to the nominal size of the crankshaft hole to form a second crankshaft hole, wherein the second crankshaft hole is a repaired crankshaft hole. The crankshaft hole coaxiality repairing method provided by the invention can reliably repair the crankshaft hole of the engine body with out-of-coaxiality, and is stable in quality and convenient and reliable to operate.
Description
Technical Field
The invention relates to the technical field of part repair, in particular to a crankshaft hole coaxiality repairing method.
Background
The 240 diesel engine is a main diesel engine configured for railway transportation diesel locomotives in China at the end of the last ninety years, and is used for more than 20 years, and is the peak period of major overhaul of the diesel engine. The diesel engine body adopts a welding structure, and due to complete release and long-term use of welding stress, when the diesel engine is overhauled and disassembled, the coaxiality of crankshaft holes (9 positions in total) of most of the diesel engine body is measured and found to be out of tolerance, so that the diesel engine body cannot be used and great waste is caused.
In the prior art, for a crankshaft hole of an engine body with out-of-coaxiality, the crankshaft holes of 9 positions of the engine body are coated by a coating method according to the coaxiality measurement size, the single sides of the crankshaft holes are coated by 0.2-0.3mm respectively, and then the crankshaft holes are ground by a mould, so that the coaxiality of the crankshaft holes of the engine body meets the requirement.
However, the repair is carried out by a coating mode, the repair cost is high, time and labor are wasted, the coating quality is unstable, and a coating layer is easy to fall off in use, so that the quality hidden trouble is formed.
Disclosure of Invention
The invention provides a crankshaft hole coaxiality repairing method, which is used for reliably repairing a crankshaft hole of an engine body with out-of-coaxiality and is stable in quality and convenient and reliable to operate.
The invention provides a crankshaft hole coaxiality repairing method, which is applied to a diesel engine body, wherein the diesel engine body comprises the following steps: the device comprises a machine body and at least one tile cover; the machine body is connected with the tile cover through a bolt group, so that a first crankshaft hole is formed between each tile cover and the machine body; the method comprises the following steps:
detaching the bolt group to separate the machine body from the tile cover;
grinding the first surface of the tile cover to form a second surface so that the second surfaces of all the tile covers are equal in height;
mounting the tile cover after grinding to the machine body through the bolt group again to form an oval hole;
and boring the elliptical hole according to the nominal size of the crankshaft hole to form a second crankshaft hole, wherein the second crankshaft hole is a repaired crankshaft hole.
In one possible design, before grinding the first surface of the tile cover to form the second surface, the method further comprises:
and fixing all the tile covers by taking a third surface of the first surface as a reference so as to enable the third surfaces of all the tile covers to be on the same plane.
In one possible design, the grinding the first surface of the tile cap to form a second surface includes:
and simultaneously grinding the first surfaces of all the tile covers so that the second surfaces formed on all the tile covers are on the same plane.
In one possible design, the amount of grinding the first surface of the shoe cover to form the second surface is determined according to a coaxial out-of-tolerance.
In one possible design, the grinding amount is 0.2-0.3 mm.
In one possible design, the diesel engine body includes: the machine body and nine tile covers;
mounting the ground tile cover to the machine body again through the bolt group to form nine elliptical holes;
and boring the nine elliptical holes according to the nominal size of the crankshaft hole to form nine second crankshaft holes.
In one possible design, after the boring nine elliptical holes according to the nominal size of the crankshaft hole to form nine second crankshaft holes, the method further comprises:
and measuring the coaxiality of the nine second crankshaft holes, and judging whether the repaired crankshaft holes meet the preset coaxiality requirement or not.
In one possible design, the preset coaxiality requirement includes: the full-length-direction shaft hole coaxiality requirement is the coaxiality requirement of nine second crankshaft holes in the full-length direction, and the adjacent hole coaxiality requirement is the coaxiality requirement of any two adjacent holes in the nine second crankshaft holes.
In one possible design, the full length axial bore coaxiality requirement is 0.14 mm.
In one possible design, the adjacent hole coaxiality requirement is 0.8 mm.
The invention provides a crankshaft hole coaxiality repairing method, which comprises the steps of firstly removing a bolt group between a machine body and a tile cover to separate the machine body and the tile cover, then grinding a first surface of the tile cover to form a second surface so as to enable the second surfaces of all the tile covers to be equal in height, wherein the first surface is a surface used for being assembled with the machine body, then mounting the ground tile cover to the machine body again through the bolt group to form an elliptical hole, and finally boring the elliptical hole according to the nominal size of the crankshaft hole to form a second crankshaft hole, wherein the second crankshaft hole is a repaired crankshaft hole, so that the crankshaft hole of the machine body with the out-of-coaxiality can be reliably repaired, the quality is stable, and the operation is convenient and reliable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a diesel engine block to which the method for restoring the coaxiality of the crankshaft hole is applied;
FIG. 2 is a schematic flow chart illustrating a crankshaft bore coaxiality restoration method according to an exemplary embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a crankshaft bore coaxiality restoration method according to another exemplary embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a crankshaft bore coaxiality restoration method according to yet another exemplary embodiment of the present invention.
Reference numerals:
1: a body;
2: a bolt group;
3: and (7) covering the tile.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic structural diagram of a diesel engine body to which the method for restoring the coaxiality of the crankshaft hole is applied. As shown in fig. 1, the diesel engine body to which the method for restoring the coaxiality of the crankshaft hole provided by the invention is applied comprises: the engine comprises an engine body 1 and at least one tile cover 3, wherein the engine body 1 and the tile cover 3 are connected through a bolt group 2, so that a first crankshaft hole is formed between each tile cover 3 and the engine body 1.
The crankshaft holes of the 240 diesel engine body are uniformly arranged along the axial direction (longitudinal direction) of the holes shown in the figure 1, the hole diameter is phi 235 and is 82 thick, the running quality of the diesel engine is directly influenced by the coaxiality tolerance of the 9-bit crankshaft holes, and the diesel engine is strictly controlled whether newly manufactured or overhauled.
FIG. 2 is a schematic flow chart illustrating a crankshaft bore coaxiality restoration method according to an exemplary embodiment of the invention. As shown in fig. 2, the method for restoring the coaxiality of the crankshaft hole provided in this embodiment includes:
and 101, dismantling the bolt group to separate the machine body from the tile cover.
Specifically, the diesel engine body adopts a welding structure, and due to complete release and long-term use of welding stress, coaxiality of crankshaft holes of most of the diesel engine body is poor during overhaul and disassembly of the diesel engine. The coaxiality requirement of the crankshaft hole of the overhaul body of the 240 diesel engine is as follows: the coaxiality of nine holes in the full length direction is 0.14mm, and the coaxiality of two adjacent holes is 0.80mm, and the holes need to be repaired when the holes exceed the coaxiality.
Before a crankshaft hole needing to be repaired on a diesel engine is repaired, a bolt group is required to be dismantled to separate a machine body from a tile cover, so that corresponding grinding operation can be carried out on the tile cover in the following process, and the foundation for repairing in the following process is provided.
For a 240 diesel engine overhaul body, nine bolt groups need to be sequentially dismantled, and nine tile covers are separated from the body.
And 102, grinding the first surface of the tile cover to form a second surface so that the second surfaces of all the tile covers are equal in height.
And after the bolt group is removed to separate the machine body from the tile cover, grinding the first surface of the tile cover to form a second surface so that the second surfaces of all the tile covers are equal in height. Wherein, the tile covers can be ground individually, or all the tile covers can be fixed in a clamp at the same time for simultaneous grinding. It should be noted that, in this embodiment, the grinding manner of the tile cover is not specifically limited, and it is only necessary to ensure that the second surfaces of all the obtained tile covers are equal in height after the tile cover is ground.
For the 240 diesel engine overhaul body, after the bolt group is removed to separate the body from the nine tile covers, the first surfaces of the nine tile covers are ground to form second surfaces, so that the second surfaces of all the tile covers are equal in height. Wherein, nine tile covers can be ground separately, or all tile covers can be fixed in a clamp at the same time for grinding at the same time.
In addition, the grinding amount of the first surface of the tile cover to form the second surface can be determined according to the coaxial out-of-tolerance value, so that the subsequent crankshaft hole can be completely machined.
For a 240 diesel engine overhaul body, the grinding amount of the second surface formed by grinding the first surface of the tile cover can be determined according to the coaxial out-of-tolerance value, wherein based on the dimension 820 +/-0.25 from the cylinder table surface on two sides of the upper part of the body to the crankshaft hole, most of the dimension of the body is usually processed into 820 plus 0.20 when the body is newly manufactured, so that the upward movement amount of the center of the crankshaft hole, namely the grinding amount of the upper plane of the tile cover, is 0.40-0.45mm, and the grinding amount can be selected according to the coaxiality out-of-tolerance value, is in the range of 0.20-0.30mm, is required to be not less than 0.20mm, and is convenient for the complete processing. And after grinding, the bush cover is installed back, and the crankshaft hole which becomes the elliptical hole is subjected to boring processing according to a newly manufactured drawing.
And 103, mounting the ground tile cover to the machine body again through the bolt group to form an oval hole.
After the tile cover is ground, the ground tile cover is mounted to the machine body again through the bolt group to form the elliptical hole. The elliptical hole is a basic hole of the crankshaft hole which is subsequently subjected to boring repair.
And 104, boring the elliptical hole according to the nominal size of the crankshaft hole to form a second crankshaft hole, wherein the second crankshaft hole is a repaired crankshaft hole.
Specifically, the elliptical hole may be bored according to a nominal size of the crankshaft hole specified in a new machine design drawing to form a second crankshaft hole, where the second crankshaft hole formed after boring is the repaired crankshaft hole.
For the 240 diesel engine overhaul body, the elliptical hole can be bored according to the nominal size phi 235 of the crankshaft hole specified by a new engine design drawing to form a second crankshaft hole, wherein the second crankshaft hole formed after boring is the repaired crankshaft hole, so that the size phi 235 of the crankshaft hole and tolerance are restored, and the coaxiality of the hole is repaired at the same time.
The following explains a specific implementation principle of the crankshaft hole coaxiality restoration method provided by the embodiment with reference to an application of the crankshaft hole coaxiality restoration method provided by the embodiment in a 240 diesel engine overhaul body:
the crankshaft holes of the 240 diesel engine body are uniformly arranged along the axial direction (longitudinal direction) of the holes shown in the figure, the hole diameter phi 235 is 82, the running quality of the diesel engine is directly influenced by the coaxiality tolerance of the 9-bit crankshaft holes, and the diesel engine is strictly controlled in both new manufacturing and overhaul. The coaxiality requirement of crankshaft holes of the overhaul body of the 240 diesel engine is as follows: the coaxiality of 9 holes in the full length direction is 0.14mm, and the coaxiality of two adjacent holes is 0.80mm, and the holes need to be repaired when the holes exceed the coaxiality. The principle of the machine body coaxiality repairing technology is as follows: grinding the upper plane of the tile cover by 0.20-0.30mm, and aligning the tile cover with a machine body to change a crankshaft hole into an elliptical hole, wherein the horizontal direction is a long axis and the vertical direction is a short axis. And then, machining according to the newly manufactured size, recovering the phi 235 size and tolerance of the crankshaft hole, and simultaneously repairing the coaxiality of the hole. Based on the 820 +/-0.25 of the dimension from the cylinder table surface on two sides of the upper part of the engine body to the crankshaft hole, the dimension of the engine body is mostly processed into 820 when the engine body is newly manufactured, so that the upward moving amount of the center of the crankshaft hole, namely the grinding amount of the upper plane of the tile cover, is 0.40-0.45mm, the upper plane of the tile cover is ground for 0.20-0.30mm each time, and the engine body can be repaired for 2 times by the method in the whole life cycle (35-40 years), so that the engine body has the maximum use value.
In this embodiment, the bolt group between the machine body and the tile cover is firstly removed to separate the machine body and the tile cover, then the first surface of the tile cover is ground to form the second surface, so that the second surfaces of all the tile covers are equal in height, wherein the first surface is a surface used for being assembled with the machine body, then the ground tile cover is installed to the machine body again through the bolt group to form an elliptical hole, and finally the elliptical hole is bored according to the nominal size of the crankshaft hole to form a second crankshaft hole, wherein the second crankshaft hole is a repaired crankshaft hole, so that the crankshaft hole of the machine body with the out-of-coaxiality can be reliably repaired, the quality is stable, and the operation is convenient and reliable.
FIG. 3 is a schematic flow chart illustrating a crankshaft bore coaxiality restoration method according to another exemplary embodiment of the invention. As shown in fig. 3, the method for restoring the coaxiality of the crankshaft hole provided in this embodiment includes:
and step 201, fixing all the tile covers by taking a third surface far away from the first surface as a reference so as to enable the third surfaces of all the tile covers to be on the same plane.
In order to further improve the subsequent grinding precision of the tile cover, all the tile covers can be fixed by taking the third surface far away from the first surface as a reference, so that the third surfaces of all the tile covers are on the same plane, wherein the third surfaces are uniformly fixed, so that a uniform reference surface can be established in the height direction of the tile cover before the subsequent grinding operation, and the second surface formed after the subsequent grinding can have better precision.
And 202, dismantling the bolt group to separate the machine body from the tile cover.
Specifically, the diesel engine body adopts a welding structure, and due to complete release and long-term use of welding stress, coaxiality of crankshaft holes of most of the diesel engine body is poor during overhaul and disassembly of the diesel engine. The coaxiality requirement of the crankshaft hole of the overhaul body of the 240 diesel engine is as follows: the coaxiality of nine holes in the full length direction is 0.14mm, and the coaxiality of two adjacent holes is 0.80mm, and the holes need to be repaired when the holes exceed the coaxiality.
Before a crankshaft hole needing to be repaired on a diesel engine is repaired, a bolt group is required to be dismantled to separate a machine body from a tile cover, so that corresponding grinding operation can be carried out on the tile cover in the following process, and the foundation for repairing in the following process is provided.
For a 240 diesel engine overhaul body, nine bolt groups need to be sequentially dismantled, and nine tile covers are separated from the body.
And step 203, grinding the first surface of the tile cover to form a second surface so that the second surfaces of all the tile covers are equal in height.
After the bolt group is removed to separate the machine body from the tile cover, all the tile covers can be simultaneously fixed in a fixture for simultaneous grinding, so that the grinding efficiency and the precision of each tile cover after processing are improved.
For the 240 diesel engine overhaul body, after the bolt group is removed to separate the body from the nine tile covers, the nine tile covers can be simultaneously fixed in a fixture for simultaneous grinding, so that the grinding efficiency and the precision of each tile cover after processing are improved.
In addition, the grinding amount of the first surface of the tile cover to form the second surface can be determined according to the coaxial out-of-tolerance value, so that the subsequent crankshaft hole can be completely machined.
For a 240 diesel engine overhaul body, the grinding amount of the second surface formed by grinding the first surface of the tile cover can be determined according to the coaxial out-of-tolerance value, wherein based on the dimension 820 +/-0.25 from the cylinder table surface on two sides of the upper part of the body to the crankshaft hole, most of the dimension of the body is usually processed into 820 plus 0.20 when the body is newly manufactured, so that the upward movement amount of the center of the crankshaft hole, namely the grinding amount of the upper plane of the tile cover, is 0.40-0.45mm, and the grinding amount can be selected according to the coaxiality out-of-tolerance value, is in the range of 0.20-0.30mm, is required to be not less than 0.20mm, and is convenient for the complete processing. And after grinding, the bush cover is installed back, and the crankshaft hole which becomes the elliptical hole is subjected to boring processing according to a newly manufactured drawing.
And step 204, mounting the ground tile cover to the machine body again through the bolt group to form an oval hole.
After the tile cover is ground, the ground tile cover is mounted to the machine body again through the bolt group to form the elliptical hole. The elliptical hole is a basic hole of the crankshaft hole which is subsequently subjected to boring repair.
And 205, boring the elliptical hole according to the nominal size of the crankshaft hole to form a second crankshaft hole, wherein the second crankshaft hole is a repaired crankshaft hole.
Specifically, the elliptical hole may be bored according to a nominal size of the crankshaft hole specified in a new machine design drawing to form a second crankshaft hole, where the second crankshaft hole formed after boring is the repaired crankshaft hole.
For the 240 diesel engine overhaul body, the elliptical hole can be bored according to the nominal size phi 235 of the crankshaft hole specified by a new engine design drawing to form a second crankshaft hole, wherein the second crankshaft hole formed after boring is the repaired crankshaft hole, so that the size phi 235 of the crankshaft hole and tolerance are restored, and the coaxiality of the hole is repaired at the same time.
FIG. 4 is a schematic flow chart illustrating a crankshaft bore coaxiality restoration method according to yet another exemplary embodiment of the present invention. As shown in fig. 4, the method for restoring the coaxiality of the crankshaft hole provided in this embodiment includes:
and 301, fixing all the tile covers by taking a third surface far away from the first surface as a reference so as to enable the third surfaces of all the tile covers to be on the same plane.
In order to further improve the subsequent grinding precision of the tile cover, all the tile covers can be fixed by taking the third surface far away from the first surface as a reference, so that the third surfaces of all the tile covers are on the same plane, wherein the third surfaces are uniformly fixed, so that a uniform reference surface can be established in the height direction of the tile cover before the subsequent grinding operation, and the second surface formed after the subsequent grinding can have better precision.
And 302, detaching the bolt group to separate the machine body from the tile cover.
Specifically, the diesel engine body adopts a welding structure, and due to complete release and long-term use of welding stress, coaxiality of crankshaft holes of most of the diesel engine body is poor during overhaul and disassembly of the diesel engine. The coaxiality requirement of the crankshaft hole of the overhaul body of the 240 diesel engine is as follows: the coaxiality of nine holes in the full length direction is 0.14mm, and the coaxiality of two adjacent holes is 0.80mm, and the holes need to be repaired when the holes exceed the coaxiality.
Before a crankshaft hole needing to be repaired on a diesel engine is repaired, a bolt group is required to be dismantled to separate a machine body from a tile cover, so that corresponding grinding operation can be carried out on the tile cover in the following process, and the foundation for repairing in the following process is provided.
For a 240 diesel engine overhaul body, nine bolt groups need to be sequentially dismantled, and nine tile covers are separated from the body.
And step 303, grinding the first surface of the tile cover to form a second surface so that the second surfaces of all the tile covers are equal in height.
After the bolt group is removed to separate the machine body from the tile cover, all the tile covers can be simultaneously fixed in a fixture for simultaneous grinding, so that the grinding efficiency and the precision of each tile cover after processing are improved.
For the 240 diesel engine overhaul body, after the bolt group is removed to separate the body from the nine tile covers, the nine tile covers can be simultaneously fixed in a fixture for simultaneous grinding, so that the grinding efficiency and the precision of each tile cover after processing are improved.
In addition, the grinding amount of the first surface of the tile cover to form the second surface can be determined according to the coaxial out-of-tolerance value, so that the subsequent crankshaft hole can be completely machined.
For a 240 diesel engine overhaul body, the grinding amount of the second surface formed by grinding the first surface of the tile cover can be determined according to the coaxial out-of-tolerance value, wherein based on the dimension 820 +/-0.25 from the cylinder table surface on two sides of the upper part of the body to the crankshaft hole, most of the dimension of the body is usually processed into 820 plus 0.20 when the body is newly manufactured, so that the upward movement amount of the center of the crankshaft hole, namely the grinding amount of the upper plane of the tile cover, is 0.40-0.45mm, and the grinding amount can be selected according to the coaxiality out-of-tolerance value, is in the range of 0.20-0.30mm, is required to be not less than 0.20mm, and is convenient for the complete processing. And after grinding, the bush cover is installed back, and the crankshaft hole which becomes the elliptical hole is subjected to boring processing according to a newly manufactured drawing.
And step 304, mounting the ground tile cover to the machine body again through the bolt group to form an oval hole.
After the tile cover is ground, the ground tile cover is mounted to the machine body again through the bolt group to form the elliptical hole. The elliptical hole is a basic hole of the crankshaft hole which is subsequently subjected to boring repair.
And 305, boring the elliptical hole according to the nominal size of the crankshaft hole to form a second crankshaft hole, wherein the second crankshaft hole is a repaired crankshaft hole.
Specifically, the elliptical hole may be bored according to a nominal size of the crankshaft hole specified in a new machine design drawing to form a second crankshaft hole, where the second crankshaft hole formed after boring is the repaired crankshaft hole.
For the 240 diesel engine overhaul body, the elliptical hole can be bored according to the nominal size phi 235 of the crankshaft hole specified by a new engine design drawing to form a second crankshaft hole, wherein the second crankshaft hole formed after boring is the repaired crankshaft hole, so that the size phi 235 of the crankshaft hole and tolerance are restored, and the coaxiality of the hole is repaired at the same time.
And step 306, measuring the coaxiality of the second crankshaft hole, and judging whether the repaired crankshaft hole meets the preset coaxiality requirement.
Wherein, the preset coaxiality requirement can comprise: the coaxiality requirement of the full-length-direction shaft holes and the coaxiality requirement of the adjacent holes are met, wherein the coaxiality requirement of the full-length-direction shaft holes is the coaxiality requirement of the nine second crankshaft holes in the full-length direction, and the coaxiality requirement of the adjacent holes is the coaxiality requirement of any two adjacent holes in the nine second crankshaft holes.
The coaxiality requirement of the shaft hole in the full length direction can be 0.14mm, and the coaxiality requirement of the adjacent hole is 0.8 mm. In addition, the coaxiality requirement of the shaft hole in the full length direction and the coaxiality requirement of the adjacent hole can be specifically set according to the actual working condition, and the specific value is not limited in the embodiment.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", and the like, as used herein, indicate an orientation or positional relationship based on that shown in the drawings, merely to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the position or element referred to must have a particular orientation, be of particular construction and operation, and therefore, should not be considered as limiting the invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements.
The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact with each other through another feature therebetween.
Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The crankshaft hole coaxiality repairing method is applied to a diesel engine body, and the diesel engine body comprises the following steps: the device comprises a machine body and at least two tile covers; the machine body is connected with the tile cover through a bolt group, so that a first crankshaft hole is formed between each tile cover and the machine body; the method comprises the following steps:
detaching the bolt group to separate the machine body from the tile cover;
grinding the first surface of the tile cover to form a second surface so that the second surfaces of all the tile covers are equal in height;
mounting the tile cover after grinding to the machine body through the bolt group again to form an oval hole;
boring the elliptical hole according to the nominal size of the crankshaft hole to form a second crankshaft hole, wherein the second crankshaft hole is a repaired crankshaft hole;
the elliptical hole is a basic hole of the second crankshaft hole formed after boring and repairing.
2. The method of claim 1, wherein prior to grinding the first surface of the shoe cover to form the second surface, further comprising:
and fixing all the tile covers by taking a third surface far away from the first surface as a reference so that the third surfaces of all the tile covers are on the same plane.
3. The method of claim 2, wherein grinding the first surface of the shoe cover to form a second surface comprises:
and simultaneously grinding the first surfaces of all the tile covers so that the second surfaces formed on all the tile covers are on the same plane.
4. The method of claim 3, wherein an amount of grinding the first surface of the shoe cover to form the second surface is determined based on a concentricity out-of-tolerance.
5. The method for recovering the coaxiality of the crankshaft hole as claimed in claim 4, wherein the grinding amount is 0.2 to 0.3 mm.
6. The method for restoring the coaxiality of the crankshaft hole according to any one of claims 1 to 5, wherein the diesel engine body includes: the machine body and nine tile covers;
mounting the ground tile cover to the machine body again through the bolt group to form nine elliptical holes;
and boring the nine elliptical holes according to the nominal size of the crankshaft hole to form nine second crankshaft holes.
7. The crankshaft bore coaxiality restoration method according to claim 6, further comprising, after the boring of the nine elliptical holes according to the nominal size of the crankshaft bore to form the nine second crankshaft bores:
and measuring the coaxiality of the nine second crankshaft holes, and judging whether the repaired crankshaft holes meet the preset coaxiality requirement or not.
8. The method of claim 7, wherein the predetermined coaxiality requirement includes: the full-length-direction shaft hole coaxiality requirement is the coaxiality requirement of nine second crankshaft holes in the full-length direction, and the adjacent hole coaxiality requirement is the coaxiality requirement of any two adjacent holes in the nine second crankshaft holes.
9. The method for restoring the coaxiality of the crankshaft hole according to claim 8, wherein the coaxiality of the shaft hole in the full-length direction is required to be 0.14 mm.
10. The method of claim 9, wherein the requirement for concentricity of adjacent bores is 0.8 mm.
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| CN101758360A (en) * | 2009-12-11 | 2010-06-30 | 沪东重机有限公司 | Repairing and processing method of main bearing hole on stand of diesel engine for ship |
| CN105345389A (en) * | 2015-12-24 | 2016-02-24 | 沃德传动（天津）股份有限公司 | Method for repairing damaged bearing block |
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| EP0263713A1 (en) * | 1986-10-08 | 1988-04-13 | Chromalloy Gas Turbine Corporation | Method for repairing by solid state diffusion metal parts having damaged holes |
| CN102909519B (en) * | 2012-11-21 | 2015-12-23 | 南车戚墅堰机车有限公司 | The restorative procedure of machine body cylinder screw |
| CN104801919A (en) * | 2015-05-05 | 2015-07-29 | 沈阳东卫机器制造有限公司 | Repairing method for bearing seat |
| CN104786003B (en) * | 2015-05-25 | 2018-04-03 | 南车戚墅堰机车有限公司 | The restorative procedure of housing main bearing dead eye |
| CN106378468A (en) * | 2016-12-08 | 2017-02-08 | 陕西启源科技发展有限责任公司 | Repairing method of diesel engine body benchmark main bearing hole |
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| CN101758360A (en) * | 2009-12-11 | 2010-06-30 | 沪东重机有限公司 | Repairing and processing method of main bearing hole on stand of diesel engine for ship |
| CN105345389A (en) * | 2015-12-24 | 2016-02-24 | 沃德传动（天津）股份有限公司 | Method for repairing damaged bearing block |
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