CN111633429A - Tappet hole repairing device and method - Google Patents

Abstract

The invention belongs to the technical field of engine production and manufacturing, and discloses a tappet hole repairing device and a tappet hole repairing method. This tappet hole reprocesses device includes: the fixing mechanism is abutted against the cylinder block to fix the cylinder block; the first cutter assembly is used for reaming a tappet hole of the cylinder body to form a bottom hole; the plug is arranged in the bottom hole; and the second cutter component is used for drilling on the plug to form a preset tappet hole. This tappet hole reprocesses device realizes reprocessing of tappet hole for the processing size precision accords with tappet hole processing technical requirement after the processing is reprocessed in the tappet hole of cylinder block, and makes original tappet hole formation size specification unanimous bottom outlet on the cylinder block, need not every tappet hole all have one rather than size assorted stopper stifled rather than corresponding, through the bottom outlet with the stifled mutually supporting of stopper, the commonality is strong, has reduced the stifled processing degree of difficulty of stopper.

Description

Tappet hole repairing device and method

Technical Field

The invention relates to the technical field of engine production and manufacturing, in particular to a tappet hole repairing device and a tappet hole repairing method.

Background

At present, a cylinder body of a diesel engine is provided with a plurality of cylinder holes, each cylinder hole is provided with two tappets, and related series products are taken as examples, and the processing technical requirements of the tappet holes in the cylinder body are as follows: the diameter is phi 20.01, the tolerance is 0-0.02mm, the cylindricity is phi 0.01, the position degree is phi 0.3, and the roughness is Rz 16.

A tappet hole of the existing cylinder block is roughly machined by adopting a domestic special machine tool and a whole alloy cutter, the working procedure capacity index Cpk value is between 1.0 and 1.33 (wherein when the working procedure capacity index Cpk value is between 1.0 and 1.33, the working procedure capacity meets the requirement but is insufficient, when the Cpk value is very close to 1, the risk of generating an out-of-tolerance exists, measures are taken to strengthen the control of the working procedure, when the working procedure capacity index Cpk value is between 0.67 and 1.0, the working procedure capacity is insufficient, the requirement of the standard cannot be met, improved measures are taken, the process conditions are changed, the standard is revised or the total number inspection is strictly carried out, when the working procedure capacity index Cpk value is less than 0.67, the working procedure capacity is seriously insufficient, the machine is stopped and straightened out if necessary), the position degree in the rough machining of the tappet hole is often out-of 0.10mm to 0.6mm due to the insufficient processing capacity of the tappet hole in the actual production, the machining size of the tappet hole is large enough to enable the machined tappet hole not to meet the machining technical requirements, the tappet hole cannot be reworked and repaired, the whole cylinder body becomes a waste product, and the production cost is increased.

Disclosure of Invention

The invention aims to provide a tappet hole repairing device and a tappet hole repairing method, which aim to solve the problem that a tappet hole cannot be repaired due to poor machining and reduce the rejection rate.

In order to achieve the purpose, the invention adopts the following technical scheme:

a tappet hole repair device comprising:

the fixing mechanism is used for abutting against the cylinder block so as to fix the cylinder block;

the first cutter assembly is used for reaming a tappet hole of the cylinder body to form a bottom hole;

the plug is arranged in the bottom hole;

and the second cutter assembly is used for drilling on the plug to form a preset tappet hole.

Preferably, the bottom hole is of an inverted T-shaped structure, a boss is convexly arranged at the bottom of the plug, and the boss is arranged at the large end part of the bottom hole.

Preferably, the plug is provided with a communication oil duct, and the communication oil duct is respectively communicated with the preset tappet hole and the main oil duct.

Preferably, the plug and the bottom hole are in interference fit, and the interference fit amount between the plug and the bottom hole is 0.02-0.035 mm.

Preferably, the outer circumferential surface of the plug is provided with an accommodating ring groove along the circumferential direction of the plug, and fastening glue is filled between the plug and the bottom hole and inside the accommodating ring groove.

Preferably, the minimum distance between the preset tappet hole and the cylinder hole adjacent to the preset tappet hole is greater than the preset distance.

Preferably, the plug is made of a material having the same thermal expansion coefficient as that of the cylinder block.

In order to achieve the above object, the present invention further provides a tappet hole repairing method, which includes the following steps:

placing the cylinder body on a fixing mechanism and clamping and fixing the cylinder body by using the fixing mechanism;

the inner wall of a tappet hole of the cylinder body is cut by the first cutter assembly to be subjected to reaming treatment, and a bottom hole is formed;

processing a plug and plugging the plug in the bottom hole;

and drilling the plug by using the second cutter assembly to form a preset tappet hole.

Preferably, the first tool assembly comprises a first expanding cutter and a reverse boring cutter;

the machining step of the bottom hole comprises the following steps:

cutting the inner wall of the tappet hole by using a first reamer;

and reversely boring a tappet hole sinking platform by using a reverse boring cutter, wherein the tappet hole sinking platform is used for accommodating the plugged boss.

Preferably, after the plug is plugged in the bottom hole, the communicating oil passage is drilled in the plug by a gun drill.

The invention has the beneficial effects that:

according to the tappet hole repairing device provided by the invention, the fixing mechanism is arranged to abut against the cylinder body, so that the cylinder body is fixed, the position movement of the cylinder body is reduced, and the processing precision of the preset tappet hole is ensured; set up in the bottom hole through the stopper stifled and utilize second cutter unit spare to carry out drilling treatment on the stopper stifled to form and predetermine the tappet hole, realize reprocessing of tappet hole, make the tappet hole of cylinder block process size precision and accord with tappet hole processing technical requirement after reprocessing processing. The first cutter assembly is adopted to perform reaming treatment on the tappet hole of the cylinder body to form a bottom hole, and the plug is arranged in the bottom hole, so that the original tappet hole on the cylinder body forms the bottom hole with the consistent size specification, each tappet hole is not required to be provided with a plug matched with the tappet hole in size and correspond to the tappet hole, and the processing difficulty of the plug is reduced due to the mutual matching of the bottom hole and the plug.

The tappet hole repairing method provided by the invention solves the problem that defective products generated due to tappet hole machining cannot be repaired, improves the product repairing rate and reduces the production cost. For the cylinder block of different models and structures, other can process without changing, and the cylinder block after reprocessing can be reprocessed repeatedly moreover, improves the takt time, reduces the rejection rate.

Drawings

FIG. 1 is a schematic structural view of a plug in a tappet hole repairing device according to the present invention;

FIG. 2 is a schematic view of the bottom hole configuration of the tappet hole repairing device of the present invention;

FIG. 3 is a process flow diagram of a tappet hole repair method of the present invention.

In the figure:

100. a cylinder block;

1. a bottom hole; 11. a tappet hole sinking platform; 12. a shaft hole;

2. plugging; 21. a boss; 22. an accommodating ring groove.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via 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.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Various parameter indexes such as diameter, roundness, roughness, position degree and the like of the tappet hole of the existing cylinder block 100 can be directly reprocessed to meet the technical requirements of tappet hole processing if the parameter index size is too small, namely the diameter is phi 20.01, the tolerance is 0-0.02mm, the cylindricity is phi 0.01, the position degree is phi 0.3 and the roughness is Rz 16. The limitation of the tappet hole processing in the prior art is that if the position degree out of tolerance phi is 0.10-0.6 mm during the tappet hole rough processing, the size of the parameter index scale is too large, and the technical requirement of the tappet hole processing cannot be met after the tappet hole is finished.

In order to solve the problem, the present embodiment provides a tappet hole repairing device, as shown in fig. 1-2, the tappet hole repairing device includes a fixing mechanism, a first cutter assembly, a plug 2, and a second cutter assembly, the fixing mechanism is configured to abut against the cylinder block 100 to fix the cylinder block 100, the first cutter assembly is configured to perform a reaming process on a tappet hole of the cylinder block 100 to form a bottom hole 1; the plug 2 is of a cylindrical structure, the plug 2 is arranged in the bottom hole 1, and the second cutter assembly is used for drilling the plug 2 to form a preset tappet hole.

It can be understood that the tappet hole specifically refers to a tappet hole with an out-of-dimension generated on the cylinder block 100 due to insufficient processing capacity, and the tappet hole is an original tappet hole with an overlarge parameter index size; the bottom hole 1 is formed by further reaming the original tappet hole by utilizing a first cutter assembly; the preset tappet hole is a new tappet hole formed by machining the plug 2 again by utilizing the second cutter assembly, and the preset tappet hole meets the technical requirement of tappet hole machining.

According to the tappet hole repairing device provided by the embodiment, the fixing mechanism is arranged to abut against the cylinder block 100, so that the cylinder block 100 is fixed, and the position movement of the cylinder block 100 is reduced, so that the processing precision of the preset tappet hole is ensured; set up in bottom hole 1 through stifled 2 and utilize second cutter unit spare to carry out drilling treatment on stifled 2 of stopper to form and predetermine tappet hole, realize the reprocessing of tappet hole, make the tappet hole of cylinder block 100 reprocess the post-processing size precision and accord with tappet hole processing technical requirement. The first cutter assembly is adopted to perform reaming treatment on the tappet hole of the cylinder body 100 to form a bottom hole 1, and the plug 2 is arranged in the bottom hole 1, so that the original tappet hole on the cylinder body 100 forms the bottom hole 1 with the same size and specification, each tappet hole is not required to be provided with the plug 2 matched with the tappet hole in size and corresponding to the tappet hole, and the processing difficulty of the plug 2 is reduced due to the mutual matching of the bottom hole 1 and the plug 2, so that the universality is strong.

Further, the fixing mechanism includes a flat plate jig and a bent plate jig, and the mutual cooperation of the flat plate jig and the bent plate jig realizes the positional stability of the cylinder block 100 in the spatial X direction, the Y direction and the Z direction. Wherein, the X direction, the Y direction and the Z direction are mutually vertical in pairs.

The plug 2 is easy to deform after the engine is heated, so that the smooth movement of the tappet is influenced. To solve this problem, the material of the plug 2 and the material of the cylinder block 100 have the same coefficient of thermal expansion. Preferably, the material of the plug 2 is the same as that of the cylinder block 100, so that the problem that the plug 2 deforms after the engine is heated to influence the tappet movement and cause machine failure is avoided. Specifically, the material for processing the plug 2 is a test bar of the same furnace when the blank of the cylinder body 100 is cast, and the plug 2 and the cylinder body 100 are made of the same material, so that the error of thermal deformation can be effectively prevented. According to the material requirement of the cylinder block 100, a bar stock with the diameter of about 35.0mm and the length of about 300mm is cast from a blank manufacturer of the cylinder block 100, and the bar stock is produced and processed on a lathe according to the drawing of the plug 2.

In order to prevent the plug 2 from falling off from the bottom hole 1, the bottom hole 1 is of an inverted T-shaped structure, specifically, a shaft hole 12 and a tappet hole sinking platform 11 (as shown in fig. 2) are processed on the cylinder block 100, the tappet hole sinking platform 11 is located below the shaft hole 12 and is communicated with the shaft hole 12 to form the bottom hole 1, and the diameter of the tappet hole sinking platform 11 is greater than that of the shaft hole 12, so that the tappet hole sinking platform 11 is a large end portion of the bottom hole 1, and the shaft hole 12 is a small end portion of the bottom hole 1. Correspondingly, a boss 21 (shown in fig. 1) is protruded at the bottom of the plug 2, and the boss 21 has a diameter of about 25mm and a height of 3 mm. The boss 21 is arranged at the large end part of the bottom hole 1, and the plug 2 is arranged at the small end part of the bottom hole 1. Through protruding boss 21 that is equipped with in the bottom of stopper stifled 2, boss 21 has played spacing effect, avoids the risk that stopper stifled 2 drops.

It can be understood that the bottom surface of the boss 21 is flush with the blank surface of the cylinder block 100, so that the outward protrusion phenomenon cannot occur, the interference between the camshaft and the plug 2 is avoided, and the installation performance is good.

In order to ensure the reliable connection between the plug 2 and the bottom hole 1, the plug 2 and the bottom hole 1 are in interference fit, wherein the interference fit amount between the plug 2 and the bottom hole 1 is between 0.02mm and 0.035 mm. Through interference fit between the plug 2 and the bottom hole 1, the plug 2 and the bottom hole 1 are tightly matched, and the connection stability is improved.

In order to further ensure the connection stability between the plug 2 and the bottom hole 1, as shown in fig. 1, a containing ring groove 22 is formed on the outer circumferential surface of the plug 2 along the circumferential direction thereof, and fastening glue is filled between the plug 2 and the bottom hole 1 and in the temporal part of the containing ring groove 22. The fastening glue is specifically bolt fastening glue, the model of the bolt fastening glue is LOCTITE243-SG, before the plug 2 is installed, the fastening glue needs to be uniformly coated on the inner wall of the bottom hole 1, the plug 2 is installed in place by using an installation tool, and then the fastening glue can flow to the outer wall of the plug 2 and the accommodating ring groove 22. Through having seted up along its circumference at the outer peripheral face of stopper stifled 2 and having held annular 22, hold annular 22 and played the effect that holds fastening glue, guaranteed the shutoff effect between stopper stifled 2 and the bottom outlet 1.

It can be understood that the embodiment takes three accommodating ring grooves 22 as an example, three accommodating ring grooves 22 are arranged in parallel, and the number of the accommodating ring grooves 22 can be adjusted according to actual production requirements.

Since the flow rate is affected after the plug 2 is plugged in the bottom hole 1, the redundant part of the plug 2 needs to be processed. A flat plate clamp is adopted, and a communicating oil duct is arranged on the plug 2 and is respectively communicated with the preset tappet hole and the main oil duct. Through setting up the intercommunication oil duct for lubricating oil in the main oil duct gets into through the intercommunication oil duct and predetermines in the tappet hole, has guaranteed lubricated effect.

After the plug 2 is provided with the preset tappet hole, in order to ensure the rigidity of the cylinder block 100, the minimum distance between the preset tappet hole and the cylinder hole adjacent to the preset tappet hole is greater than the preset distance, so that the joint of the cylinder hole and the tappet hole is reserved with enough wall thickness, the rigidity of the cylinder block 100 is ensured, and cracks are prevented.

The embodiment also provides a tappet hole repairing method, which comprises the following steps of:

placing the cylinder block 100 on a fixing mechanism and clamping and fixing the cylinder block by using the fixing mechanism;

cutting the inner wall of the tappet hole of the cylinder block 100 by using the first cutter assembly to perform reaming treatment to form a bottom hole 1;

processing a plug 2 and plugging the plug 2 in the bottom hole 1;

and drilling the plug 2 by using a second cutter assembly to form a preset tappet hole.

The tappet hole repairing method provided by the embodiment solves the problem that the defective products generated due to tappet hole machining cannot be repaired, improves the product repairing rate and reduces the production cost. For the cylinder block 100 with different models and structures, other cylinder blocks can be processed without modification, and the repaired cylinder block 100 can be repeatedly repaired, so that the production takt is improved, and the rejection rate is reduced.

Further, the fixing mechanism comprises a flat plate clamp and a bent plate clamp, the flat plate clamp and the bent plate clamp which are limited in use are adopted, design and processing are carried out according to the clamping requirement of the cylinder body 100, the flat plate clamp and the bent plate clamp are ensured to be in the horizontal direction and the vertical direction, and the parallel direction of the positioning pin is below 0.02mm, so that the processing accuracy is high.

The first cutter assembly comprises a first expanding cutter and a reverse boring cutter, and the machining step of the bottom hole 1 comprises the following steps: cutting the inner wall of the tappet hole by using a first reamer; and reversely boring the tappet hole sinking platform 11 by using a reverse boring cutter, wherein the tappet hole sinking platform 11 is used for accommodating the boss 21 of the plug 2. Specifically, the first expanding cutter is a phi 21.7 expanding cutter, the rotating speed of the first expanding cutter is 800N/Min, the feeding amount is 80mm/Min, the cutting depth is 0.85mm, and the diameter of the tappet hole is expanded by the first expanding cutter to form the shaft hole 12 of the bottom hole 1. The reverse boring cutter is phi 25.2, the rotating speed of the reverse boring cutter is 180N/Min, the feed rate is 10mm/Min, the cutting depth is 1.65mm, and the bottom of the tappet hole is processed by the reverse boring cutter to form a tappet hole sinking platform 11 of the bottom hole 1. When the tappet hole sinking platform 11 is prepared, G87 reverse boring circulation is adopted in programming, and the flatness of a reverse boring machining surface is guaranteed after 3 seconds of delay.

In order to ensure the precision of the bottom hole 1, the first cutter assembly further comprises a first reamer, the first reamer is a phi 22.0 reamer, the rotating speed of the first reamer is 360N/Min, the feeding amount is 120mm/Min, and the cutting depth is 0.15 mm. And carrying out finish reaming treatment by using a reamer so as to ensure the preparation precision of the bottom hole 1. It should be noted that after the bottom hole 1 is machined, a check process is performed, that is, various parameter indexes such as the diameter, tolerance, cylindricity, position degree, roughness, and the like of the bottom hole 1 are detected to ensure that the size of the bottom hole 1 is within an allowable process parameter range.

After the plug 2 is processed, the plug 2 needs to be installed in the bottom hole 1, and in order to facilitate installation between the plug 2 and the bottom hole 1, the plug 2 is placed in liquid nitrogen for five minutes, so that the plug 2 is cooled. If the plug 2 is not cooled, the plug 2 and the bottom hole 1 which are in interference fit have the problem of difficult assembly. According to the principle of expansion with heat and contraction with cold, the size of the plug 2 soaked by liquid nitrogen can be reduced to a certain extent, so that the plug 2 can be conveniently placed in the bottom hole 1, and the assembly difficulty is reduced. The bottom hole 1 is internally coated with fastening glue to reduce the risk of falling off of the plug 2. When the temperature of the plug 2 is recovered to the room temperature, the plug 2 gradually expands, and the plug 2 can be attached to the bottom hole 1, so that the plug 2 needs to be stored for one day after being installed, and the assembling effect is guaranteed.

After the plug 2 is plugged in the bottom hole 1, in order to avoid the influence of the plug 2 on the lubricating effect, a gun drill is used for drilling a communicating oil channel on the plug 2. The gun drill is a phi 20.0 gun drill, and the cutting depth is about 5mm, so that the lubricating effect of the tappet hole on the tappet is ensured.

Further, the second cutter assembly comprises a drill bit, a second reamer and a second reamer, the drill bit is a phi 18.5 drill bit, the rotating speed of the drill bit is 1500N/Min, the feeding amount is 100mm/Min, and the cutting depth is 9.25mm, so that the initial tappet hole is drilled. The second expanding cutter is phi 19.7 expanding cutter, the rotating speed of the second expanding cutter is 800N/Min, the feeding amount is 80mm/Min, the cutting depth is 0.6mm, and the second expanding cutter is used for expanding the initial tappet hole to play a role in rough machining. The second reamer is a phi 20.0 reamer, the rotating speed of the second reamer is 1270N/Min, the feeding amount is 120mm/Min, the cutting depth is 0.15mm, and the second reamer is used for performing fine correction treatment on the reamed tappet hole, so that the fine machining effect is achieved.

Watch-cutter watch

In order to ensure that the wall thickness of the joint of the cylinder hole and the tappet hole is reasonable and prevent cracks from generating, the plugs 2 with three diameters are designed, and the diameters of the three plugs 2 are respectively as follows: 21.0mm, 22.0mm and 3.0mm, respectively, and performing tests to obtain the optimal scheme. The diameter of the selected plug 2 is 22.0mm through tests, the minimum distance between the preset tappet hole and the cylinder hole adjacent to the tappet hole is larger than the preset distance, and the preset distance is about 1.0 mm. That is, it is preferable that the plug 2 has a diameter of 22.0mm and the minimum distance between the plug 2 and the cylinder bore adjacent thereto is 1.0 mm.

It should be particularly noted that after the preset tappet hole is machined, hundred-checking treatment is required, that is, various parameter indexes such as the diameter, tolerance, cylindricity, position degree and roughness of the preset tappet hole are detected, so as to ensure that the size of the preset tappet hole is within an allowable process parameter range.

As shown in fig. 3, the step of the tappet hole repairing method provided in this embodiment is specifically:

1. processing the plug 2, manufacturing a fixing mechanism, preparing a first cutter assembly, a gun drill, a second cutter assembly and programming;

2. processing a bottom hole 1 and performing hundred-inspection on the bottom hole;

3. placing the plug 2 in liquid nitrogen for 5 minutes;

4. coating fastening glue in the bottom hole 1;

5. the plug is installed and then stored for 1 day after 2 days;

6. drilling a communicating oil passage on the plug 2;

7. processing a preset tappet hole on the plug 2 and carrying out hundred-inspection on the tappet hole;

8. and removing burrs from the preset tappet holes.

By adopting the tappet hole repairing method provided by the embodiment, the production cost is effectively saved, and the cost for repairing is calculated as follows:

1. the cost of the tooling fixture is 4.69 ten thousand yuan. The calculation is as follows:

meter two tool clamp cost meter

2. Labor cost: the 50 cylinder blocks 100 need 2 persons to process 56 working hours, the labor cost per hour is 19 yuan, and the labor cost is as follows:

19 × 2 × 56 ═ 0.2128 ten thousand yuan.

3. Recovery of waste losses: 50000 units of 6DH cylinder block are produced in 100 years, the process capacity rejection rate is 0.1 percent, the selling price of each finished product is about 4500 yuan,

annual recovery of waste losses: 50000 × 0.1% × 4500 ═ 22.5 ten thousand yuan.

4. Totaling in this year: 22.5-4.69-0.2128 ═ 17.5972 ten thousand yuan

The method for repairing the tappet hole solves the problem of defective product repair of the tappet hole due to the machining precision problem, is suitable for repairing all diesel engine tappet hole machining problems of the same material, has good practicability and good economical efficiency, is machined on a machining center machine tool, has higher machining precision stability, is convenient to adjust and repair repeatedly, and has high reliability. Meanwhile, the tappet hole repairing method solves the risk problems of deformation and falling of the plug 2, cracks of the cylinder body 100 and the like. After the tappet is repaired and detected, the detection data meet the technical requirements of tappet hole machining, and the same batch of repeated machining does not need to be adjusted.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are based on the orientations and positional relationships shown in the drawings and are used for convenience in description and simplicity in operation, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. The utility model provides a tappet hole device of reprocessing which characterized in that includes:

a fixing mechanism for abutting against a cylinder block (100) to fix the cylinder block (100);

the first cutter assembly is used for reaming a tappet hole of the cylinder body (100) to form a bottom hole (1);

a plug (2) arranged in the bottom hole (1);

and the second cutter assembly is used for drilling on the plug (2) to form a preset tappet hole.

2. The tappet hole repairing device according to claim 1, wherein the bottom hole (1) is of an inverted T-shaped structure, a boss (21) is convexly arranged at the bottom of the plug (2), and the boss (21) is arranged at the large end part of the bottom hole (1).

3. The tappet hole repairing device according to claim 1, wherein a communication oil passage is arranged on the plug (2), and the communication oil passage is respectively communicated with the preset tappet hole and the main oil passage.

4. The tappet hole repairing device according to claim 1, wherein an interference fit is adopted between the plug (2) and the bottom hole (1), and the interference fit amount between the plug and the bottom hole is 0.02-0.035 mm.

5. The lifter hole repairing device according to claim 3, characterized in that a containing ring groove (22) is formed in the outer circumferential surface of the plug (2) along the circumferential direction thereof, and fastening glue is filled between the plug (2) and the bottom hole (1) and inside the containing ring groove (22).

6. The lifter bore repair device according to claim 4, wherein a minimum distance between the preset lifter bore and the cylinder bore adjacent thereto is greater than a preset distance.

7. The tappet bore repairing device according to claim 1, wherein the plug (2) is made of a material having the same coefficient of thermal expansion as that of the cylinder block (100).

8. A tappet hole repairing method, characterized by using the tappet hole repairing apparatus according to any one of claims 1 to 7, comprising the steps of:

placing the cylinder block (100) on a fixing mechanism and clamping and fixing the cylinder block by using the fixing mechanism;

the inner wall of a tappet hole of a cylinder body (100) is cut by a first cutter assembly to be subjected to reaming treatment, and a bottom hole (1) is formed;

processing a plug (2) and plugging the plug (2) in the bottom hole (1);

and drilling the plug (2) by using the second cutter assembly to form a preset tappet hole.

9. The lifter bore reworking method according to claim 8, wherein the first cutter assembly comprises a first reamer and a reverse boring cutter;

the machining step of the bottom hole (1) comprises the following steps:

cutting the inner wall of the tappet hole by using a first reamer;

and reversely boring a tappet hole sinking platform (11) by utilizing a reverse boring cutter, wherein the tappet hole sinking platform (11) is used for accommodating the boss (21) of the plug (2).

10. The tappet hole repairing method according to claim 8, wherein after the plug (2) is plugged in the bottom hole (1), a communicating oil passage is drilled in the plug (2) by a gun drill.

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