A simulation pre-checking method for through bolt holes of a cylinder block

Abstract

A kind of simulation pre-inspection method for cylinder block through bolt hole, simulation pre-assembly is carried out on cylinder block using inspection device, the position size deviation of through bolt hole is verified in advance, the indication of operation direction is given for subsequent polishing operation, to avoid the interference between through bolt and cylinder block during assembly process;Wherein, the inspection device includes inspection sample plate and inspection sample stick, its position size is determined according to the size of through bolt and the position size of gran hole, oil hole and through bolt hole of cylinder block, installs and positions inspection sample plate on cylinder block, inserts inspection sample stick into the through bolt hole of cylinder block, checks and marks interference area, then polishes all interference areas.The present application can help subsequent operator to accurately position polishing area and range, so as to avoid the appearance of interference in cylinder assembly process, and has achieved the effects of improving work efficiency, reducing repeated rework, ensuring product precision and reducing production cost.

Description

Technical Field

[0001] This invention relates to the assembly process of marine diesel engines, specifically to a simulated pre-inspection method for cylinder block through bolt holes, belonging to the field of marine diesel engine manufacturing technology. Background Technology

[0002] During the assembly of marine diesel engine cylinders, through bolts must be inserted vertically into the cylinder block. The cylinder block is a casting; except for machined areas, other surfaces are typically raw. A single cylinder block casting usually consists of multiple structurally identical cylinder units. For example... Figure 1 and Figure 2 As shown, the cylinder block 1 has multiple through bolt holes 2, lubrication holes 3, and gland holes 4. Before using through bolts for assembly, the inner and outer rough surfaces of the through bolt holes 2 must be ground to eliminate defects such as unevenness and misalignment. This ensures that when each through bolt is inserted into the through bolt hole 2, there will be no interference between the through bolt and the cylinder block 1, preventing proper assembly. Currently, during the grinding process, because the grinding operators cannot judge the deviation of the rough surface, it is difficult to accurately determine the direction of grinding to eliminate defects. The grinding operation is very blind, resulting in extremely low grinding efficiency. Furthermore, it cannot be guaranteed that the ground through bolt holes 2 will meet the dimensional requirements for assembly.

[0003] Therefore, it is essential to develop a technology that pre-verifies the deviation of the through bolt holes on the cylinder block casting, provides operational direction for subsequent grinding operations, and avoids interference between the through bolts and the cylinder block during assembly. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a simulation pre-inspection method for through bolt holes in cylinder blocks. The method uses an inspection device to verify the positional and dimensional deviations of through bolt holes on cylinder block castings in advance through simulation, providing an indication of the operation direction for subsequent grinding operations, avoiding interference between through bolts and cylinder blocks during assembly, thereby improving work efficiency, ensuring product dimensional accuracy, and reducing production costs.

[0005] Based on the above objectives, the technical solution adopted by the present invention is as follows: A simulated pre-inspection method for through bolt holes in cylinder blocks, wherein the cylinder block is provided with through bolt holes, lubricating holes and gland holes; characterized in that: a test device is used to perform simulated pre-assembly on the cylinder block, and the positional and dimensional deviations of the through bolt holes are verified in advance, so as to provide an indication of the operation direction for subsequent grinding operations, so as to avoid interference between the through bolts and the cylinder block during the assembly process.

[0006] Furthermore, the testing device includes a test template and a test bar; The inspection template is a flat component with an oil hole boss, a gland hole boss, and multiple through screw holes. The multiple through screw holes are used to insert the inspection sample bar, and their positions correspond to the through bolt holes of the cylinder body. Their diameters are the same as those of the through bolts. The oil hole boss and the gland hole boss protrude from the plane of the inspection template, and their positions and dimensions correspond to the positions and dimensions of the oil hole and the gland hole of the cylinder body, respectively. They are used to insert into the oil hole and the gland hole to position the inspection template and ensure that the position of the through screw holes of the inspection template is consistent with the position of the through bolt holes of the cylinder body. The test sample bar is a stepped round bar, comprising a large-diameter section and a small-diameter section connected together. The diameter of the large-diameter section is the same as the diameter of the through bolt hole of the test sample plate, and the diameter of the small-diameter section is the same as the diameter of the through bolt hole of the cylinder body. The total length of the test sample bar is greater than the height of the cylinder body.

[0007] Furthermore, the test template is also provided with several irregularly shaped holes, which are used to reduce the weight of the test template while ensuring its strength.

[0008] Furthermore, the test sample is made of transparent high-strength acrylic material, and the test sample rod is made of wood.

[0009] Furthermore, the simulated pre-detection method includes the following specific steps: 1) Based on the dimensions of the through bolt and the positional dimensions of the cylinder block's gland hole, lubricating hole, and through bolt hole, make an inspection template with a lubricating hole boss, a gland hole boss, and multiple through bolt holes; 2) Based on the dimensions of the through bolt, the diameter of the through bolt hole in the cylinder body, and the height of the cylinder body, a stepped inspection sample bar including a large-diameter section and a small-diameter section is made. 3) Install the inspection template on the cylinder block, and insert the grate hole boss and the lubricating hole boss into the grate hole and the lubricating hole of the cylinder block respectively to position the inspection template. 4) Insert the test sample bar into the cylinder body from the end where the test sample plate is placed, so that the small diameter section of the sample bar is inserted into the through bolt hole of the cylinder body; 5) Check for interference: If the small diameter section of the sample bar can be fully inserted into the through bolt hole of the cylinder body, and the large diameter section of the sample bar is simultaneously located in the through bolt hole of the inspection template, then the cylinder body meets the quality requirements; if the small diameter section of the sample bar is inserted into the through bolt hole of the cylinder body, but the large diameter section of the sample bar cannot be inserted into the through bolt hole of the inspection template, then interference exists, the cylinder body does not meet the quality requirements, and the interference area is marked. 6) Repeat steps 3) to 5) until all through bolt holes of the cylinder block have been verified; 7) Grind all marked interference areas on the cylinder block.

[0010] Compared with the prior art, the present invention has achieved the following beneficial effects: This invention employs an inspection device consisting of an inspection template and an inspection bar. By simulating pre-assembly on the cylinder block, it verifies the positional and dimensional deviations of the through bolt holes on the cylinder block casting in advance, identifies areas where interference may occur during assembly, and indicates the direction of operation for subsequent grinding work. This helps operators accurately locate the grinding area and range, thereby avoiding interference between the through bolts and the cylinder block during cylinder assembly. This achieves the effects of improving work efficiency, reducing rework, ensuring product accuracy, and reducing production costs. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of the cylinder block.

[0012] Figure 2 for Figure 1 Top view.

[0013] Figure 3 This is a schematic diagram for testing the sample.

[0014] Figure 4 for Figure 3 The left view.

[0015] Figure 5 This is a schematic diagram for testing the sample bar.

[0016] Figure 6 This is a diagram showing the inspection status of the present invention.

[0017] Figure 7 for Figure 6 Top view.

[0018] Figure 8 This is a flowchart of the method of the present invention.

[0019] In the picture, 1—Cylinder block, 2—Through bolt hole, 3—Oil hole, 4—Glancing hole, 10—Inspection template, 11—Through bolt hole, 12—Irregular shaped hole, 13—Oil hole boss, 14—Glancing hole boss, 20—Inspection sample bar, 21—Large diameter section of sample bar, 22—Small diameter section of sample bar. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this should not be construed as limiting the scope of protection claimed by the present invention.

[0021] This invention is used to simulate and verify the assembly of through bolts before grinding cylinder block castings, and to identify interference caused by deviations in the position and size of the through bolt holes. This provides direction for eliminating defects in subsequent grinding operations, thereby avoiding interference between the through bolts and the cylinder block during assembly, and achieving the goals of improving work efficiency, reducing rework, ensuring product accuracy, and reducing production costs.

[0022] Please refer to the following: Figure 1 and Figure 2 The cylinder body 1 is provided with an oil lubrication hole 3, a grate hole 4 and multiple through bolt holes 2.

[0023] Example Please see Figure 6 The inspection device includes an inspection sample plate 10 and an inspection sample rod 20.

[0024] Please refer to the following: Figure 3 and Figure 4 The inspection template 10 is a flat plate made of transparent high-strength acrylic material to allow for direct inspection of interference with the cylinder body 1. It has an oil hole boss 13, a gland hole boss 14, and multiple through screw holes 11. The positions of the multiple through screw holes 11 are made according to the positions of the corresponding through bolt holes 2 on the cylinder body 1, and their diameters are the same as the diameters of the through bolts. These through screw holes 11 are used to insert the inspection template 20, serving to position the hole center distance and perpendicularity. The oil hole boss 13 and the gland hole boss 14 protrude from the plane of the inspection template 10, and their positions and dimensions are made according to the positions and dimensions of the corresponding oil holes 3 and gland holes 4 on the cylinder body 1. They are used to insert into the oil holes 3 and gland holes 4 of the cylinder body 1, respectively, to position the inspection template 10 and ensure that the positions of the through screw holes 11 on the inspection template 10 are consistent with the positions of the through bolt holes 2 on the cylinder body 1. The inspection template 10 is also provided with a number of irregularly shaped holes 12. These irregularly shaped holes 12 are used to reduce the weight of the inspection template 10 while ensuring its strength, so as to facilitate the operator's use.

[0025] Please see Figure 5The test sample 20 is a stepped wooden rod with a total length greater than the height of the cylinder body 1. The test sample 20 includes a large-diameter section 21 and a small-diameter section 22 connected vertically. The diameter of the large-diameter section 21 is the same as the diameter of the through bolt hole 11 of the test sample 10 to ensure perpendicularity. The diameter of the small-diameter section 22 is the same as the diameter of the through bolt hole 2 of the cylinder body 1 to facilitate its insertion into the cylinder body 1.

[0026] Please see Figure 8 The simulation pre-inspection method for cylinder block through bolt holes described in this invention includes the following steps: 1) Based on the positional relationship of the gland hole 4, oil hole 3 and through bolt hole 2 on the cylinder body 1, an inspection template 10 is made of acrylic material, which has an oil hole boss 13, a gland hole boss 14 and multiple through bolt holes 11. The diameter of the through bolt hole 11 is equal to the diameter of the through bolt. The oil hole boss 13 and the gland hole boss 14 protrude from the plane of the inspection template 10, and their diameters are equal to the diameters of the corresponding oil hole 3 and gland hole 4 on the cylinder body 1, respectively. 2) Based on the diameter of the through bolt hole 2 on the cylinder body 1 and the height of the cylinder body 1, a stepped inspection sample bar 20 is made of wood, including a large diameter section 21 and a small diameter section 22. The total length of the inspection sample bar 20 is greater than the height of the cylinder body 1. The diameter of the large diameter section 21 is equal to the diameter of the through bolt hole 11 of the inspection sample 10, and the diameter of the small diameter section 22 is equal to the diameter of the through bolt hole 2. 3) Install the inspection template 10 on the cylinder block 1, and insert the grate hole boss 14 and the lubricating hole boss 13 into the grate hole 4 and the lubricating hole 3 of the cylinder block 1 respectively to position the inspection template 10. 4) Insert the test sample bar 20 into the cylinder body 1 from the end where the test sample plate 10 is placed, so that the small diameter section 22 of the sample bar is inserted into the through bolt hole 2 at the bottom of the cylinder body 1. Please refer to the relevant documentation. Figure 6 and Figure 7 ; 5) Check for interference: If the small diameter section 22 of the sample bar can be fully inserted into the through bolt hole 2 of the cylinder body 1, and the large diameter section 21 of the sample bar is simultaneously located in the through bolt hole 11 of the inspection template 10, then the cylinder body 1 meets the quality requirements; if the small diameter section 22 of the sample bar is inserted into the through bolt hole 2 of the cylinder body 1, but the large diameter section 21 of the sample bar cannot be inserted into the through bolt hole 11 of the inspection template 10, then interference exists, the cylinder body 1 does not meet the quality requirements, and the interference area is marked. 6) Repeat steps 3) to 5) until all through bolt holes 2 of the cylinder block 1 are verified; 7) Polish all marked interference areas.

[0027] The scope of protection claimed by this invention is not limited to the above embodiments, but should also include other variations and alternatives that are obvious to this invention.

Claims

1. A simulated pre-inspection method for through bolt holes in cylinder blocks, wherein the cylinder block is provided with through bolt holes, lubrication holes, and gland holes; characterized in that: A testing device is used to simulate pre-assembly on the cylinder block to verify the positional and dimensional deviations of the through bolt holes in advance. This provides an indication of the operating direction for subsequent grinding operations, so as to avoid interference between the through bolts and the cylinder block during the assembly process.

2. The simulation pre-inspection method for cylinder block through bolt holes according to claim 1, characterized in that: The testing device includes a test template and a test bar; The inspection template is a flat component with an oil hole boss, a gland hole boss, and multiple through screw holes. The multiple through screw holes are used to insert the inspection sample bar, and their positions correspond to the through bolt holes of the cylinder body. Their diameters are the same as those of the through bolts. The oil hole boss and the gland hole boss protrude from the plane of the inspection template, and their positions and dimensions correspond to the positions and dimensions of the oil hole and the gland hole of the cylinder body, respectively. They are used to insert into the oil hole and the gland hole to position the inspection template and ensure that the position of the through screw holes of the inspection template is consistent with the position of the through bolt holes of the cylinder body. The test sample bar is a stepped round bar, comprising a large-diameter section and a small-diameter section connected together. The diameter of the large-diameter section is the same as the diameter of the through bolt hole of the test sample plate, and the diameter of the small-diameter section is the same as the diameter of the through bolt hole of the cylinder body. The total length of the test sample bar is greater than the height of the cylinder body.

3. The simulation pre-inspection method for cylinder block through bolt holes according to claim 2, characterized in that: The test template also has several irregularly shaped holes, which are used to reduce the weight of the test template while ensuring its strength.

4. The simulation pre-inspection method for cylinder block through bolt holes according to claim 2, characterized in that: The test sample is made of transparent high-strength acrylic material, and the test sample rod is made of wood.

5. The simulation pre-inspection method for cylinder block through bolt holes according to claim 2, characterized in that: The simulated pre-inspection method includes the following specific steps: 1) Based on the dimensions of the through bolt and the positional dimensions of the cylinder block's gland hole, lubricating hole, and through bolt hole, make an inspection template with a lubricating hole boss, a gland hole boss, and multiple through bolt holes; 2) Based on the dimensions of the through bolt, the diameter of the through bolt hole in the cylinder body, and the height of the cylinder body, a stepped inspection sample bar including a large-diameter section and a small-diameter section is made. 3) Install the inspection template on the cylinder block, and insert the grate hole boss and the lubricating hole boss into the grate hole and the lubricating hole of the cylinder block respectively to position the inspection template. 4) Insert the test sample bar into the cylinder body from the end where the test sample plate is placed, so that the small diameter section of the sample bar is inserted into the through bolt hole of the cylinder body; 5) Check for interference: If the small diameter section of the sample bar can be fully inserted into the through bolt hole of the cylinder body, and the large diameter section of the sample bar is simultaneously located in the through bolt hole of the inspection template, then the cylinder body meets the quality requirements; if the small diameter section of the sample bar is inserted into the through bolt hole of the cylinder body, but the large diameter section of the sample bar cannot be inserted into the through bolt hole of the inspection template, then interference exists, the cylinder body does not meet the quality requirements, and the interference area is marked. 6) Repeat steps 3) to 5) until all through bolt holes of the cylinder block have been verified; 7) Grind all marked interference areas on the cylinder block.

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