A radial hole machining tool and radial hole machining method for engine cylinder liner

Abstract

The present invention discloses a radial hole processing tool and a radial hole processing method for an engine cylinder sleeve. The tool comprises a sleeve-shaped drill template, a drill sleeve, a magnetic drill base plate, base plate screws, set screws, positioning pins, lifting screws and drill sleeve screws. Positioning screw holes are provided at the top and both sides of the sleeve wall of the sleeve-shaped drill template for the installation of three set screws; a lifting hole is provided at the top of the sleeve-shaped drill template for the installation of lifting screws. The drill sleeve comprises a cylindrical drill sleeve body and a drill sleeve flange with a notch; the processing method comprises the steps of initial positioning of the cylinder sleeve, radial hole positioning, installation of a magnetic drill, radial hole processing and disassembly. The cylinder sleeve radial hole processing tool and the process method of the present invention can make the radial hole processing of the cylinder sleeve manufactured by the cylinder sleeve simple and convenient to operate, with high production efficiency, good radial hole consistency, and stable and reliable processing quality. The cylinder sleeve radial hole drilling mold of the present invention has the advantages of simple structure, low manufacturing cost, simple operation, reliable processing quality, etc.

Description

Technical Field

[0001] The invention belongs to the field of mechanical processing of engine parts, and in particular relates to a tool for processing radial holes of cylinder liners of marine low-speed diesel engines, namely, a drilling jig for radial holes of cylinder liners. Background Art

[0002] The cylinder liner, cylinder head and piston assembly of a diesel engine constitute the combustion chamber of the diesel engine. The inner hole surface is directly subjected to the repeated impact of high-temperature and high-pressure gas, and is subject to considerable thermal and mechanical stress. The cylinder liner bore surface is the part of the diesel engine combustion chamber that is most strongly affected by the impact of high-temperature and high-pressure gas. It is also the guide bearing surface for the reciprocating motion of the piston group. Due to the direct effect of the sealing pressure of the piston ring and the lateral thrust of the piston, it is subjected to strong friction and is prone to wear under poor lubrication and other conditions. At the same time, due to the extremely harsh working conditions of the cylinder liner, it becomes one of the main vulnerable parts of the diesel engine.

[0003] The cylinder liner hole of the marine low-speed diesel engine is provided with a lubricating oil groove and oil is injected through the oil injection hole. The oil injection hole is often a radial oil hole. Its processing quality directly affects the lubrication condition of the cylinder liner when the diesel engine is running, so the processing quality of the cylinder liner oil injection hole is crucial. In the development and test stage of the diesel engine, it is generally necessary to install temperature sensors on the cylinder liner and other combustion chamber parts. Through the test to detect the temperature field of the diesel engine cylinder liner and other combustion chamber parts, the dynamic changes of the temperature field of the combustion chamber parts of the diesel engine when the diesel engine is running are mastered, which is of great significance to the optimization design and manufacturing of the diesel engine and its combustion chamber parts. The temperature sensor installation hole on the diesel engine cylinder liner test piece is a radial high-precision tapered hole in the cylinder liner hole. The processing accuracy of these temperature sensor installation holes will directly affect the test accuracy of the temperature field of the diesel engine combustion chamber parts.

[0004] Since the cylinder liner of a low-speed diesel engine is as long as three to four meters and the diameter of the cylinder liner is limited, the radial holes mentioned above must be drilled from the cylinder liner hole outwards. Currently, there is no mechanical processing equipment for processing, and the processing is difficult. Usually, the radial holes are processed by fitters using handheld electric drills and other tools according to the cylinder liner product drawing. In the processing of radial holes in cylinder liner parts, the above-mentioned manual handheld electric drill hole processing method often has the following problems.

[0005] ⑴ Due to the use of manual hand-held tools for alignment and marking for radial hole processing, there are more or less errors in the position, depth and surface quality of the processed radial holes, the consistency of the radial holes is poor, and the processing quality is difficult to guarantee;

[0006] ⑵During the radial hole processing operation, the fitter operator needs to control the position, direction and depth of the radial hole at the same time. In addition, the working space is small and the lighting conditions are poor, which makes the operation difficult and labor-intensive.

[0007] ⑶ Due to the high requirements for radial hole accuracy, there are many control factors during the drilling operation, the operation is difficult and the processing efficiency is low. Summary of the invention

[0008] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide an engine cylinder liner radial hole machining tool and a radial hole machining method, which can solve the above-mentioned problems.

[0009] The purpose of the present invention is achieved by adopting the following technical solutions.

[0010] A radial hole processing tool for an engine cylinder liner, the radial hole processing tool comprising a drill template basic component, a positioning component and a hoisting component, the drill template basic component comprising a sleeve-shaped drill template body, a drill sleeve, and a magnet drill base plate, wherein the sleeve-shaped drill template body is a cylindrical sleeve-shaped structure, and a sleeve hole is radially opened on the sleeve wall adjacent to one end of the sleeve-shaped drill template body for drilling sleeve holes and for installing the drill sleeve; the magnet drill base plate is detachably mounted on the inner surface of the sleeve wall at the other end of the sleeve-shaped drill template body, and the magnet drill base plate and the drill sleeve are spaced apart on the same side; the positioning component is detachably mounted on the inner wall surface of the sleeve wall of the sleeve-shaped drill template body and is used for positioning the processing tool relative to the cylinder liner to be processed; the hoisting component is mounted on the outer wall surface of the sleeve wall of the sleeve-shaped drill template body opposite to the drill sleeve.

[0011] Preferably, the positioning assembly includes three set screws, and a positioning screw hole is respectively provided at the top of the sleeve wall of the sleeve-shaped drilling template and at both sides of the top at a positioning angle α for installation with the three set screws.

[0012] Preferably, the lifting assembly includes a lifting screw, and a lifting hole is opened at the top of the sleeve wall passing through the geometric center of gravity of the sleeve-shaped drilling template for installation with the lifting screw.

[0013] Preferably, the drill sleeve comprises a cylindrical drill sleeve body and a drill sleeve flange with a notch, the drill sleeve flange is integrally arranged at one end of the cylindrical drill sleeve body, the notch is used for quick adaptation and positioning with the drill sleeve screw, and the outer edge of the other end of the cylindrical drill sleeve body is chamfered.

[0014] Preferably, the processing tool further comprises a positioning pin for auxiliary positioning, and a pin hole is provided on the mold body wall of the sleeve-shaped drill mold body perpendicular to the drill sleeve hole for inserting the positioning pin and auxiliary positioning.

[0015] A method for machining radial holes of a cylinder liner using a radial machining tool, the method comprising the following steps: S1 initial positioning of the cylinder liner, placing the cylinder liner to be machined flat on a V-shaped frame and making the axis of the cylinder liner hole horizontal, rotating the cylinder liner so that the radial hole to be machined is at the bottom; S2 radial hole positioning, assembling the machining tool and placing the machining tool plug into the cylinder liner hole, moving and rotating the machining tool so that the drill sleeve center of the drill sleeve is aligned with the radial hole to be machined in the cylinder hole, tightening three set screws to fix the machining tool at the position to be machined in the cylinder liner hole, and completing the positioning of the first radial hole machining; S3 installing the magnetic drill, installing the horizontal magnetic drill plug on the magnetic drill base plate of the machining tool, adjusting the magnetic drill plug, and rotating the magnetic drill plug. Adjust the position of the horizontal magnetic drill so that its drill shaft is aligned with the center of the drill sleeve, and turn the magnetic switch to fix the magnetic drill on the magnet drill base plate; S4 radial hole processing, install the hole processing tool on the magnetic drill shaft, start the magnetic drill to complete the processing of the first radial hole; loosen the three fixing screws to loosen the processing tool and the cylinder sleeve, rotate the cylinder sleeve, and insert the positioning pin through the pin hole on the sleeve-shaped drill template into the processed radial hole, so that the center of the drill sleeve is aligned with the next radial hole to be processed of the cylinder sleeve, and repeat the drilling process until all radial holes are processed; S5 disassembly, first remove the tool, then turn the magnetic switch to remove the horizontal magnetic drill, loosen the fixing screws, and remove the processing tool.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The radial hole machining tool of the present invention, which is specially used for the cylinder liner of a diesel engine or other cylinder parts, can be used to machine radial holes of cylinder liner or other cylinder parts. When machining radial holes of cylinder liner or other cylinder parts, the radial hole machining jig is positioned by inserting the positioning pin 6 into the hole, and the position accuracy of the machined radial hole is high;

[0017] 2. The radial hole machining tool of the present invention is specially used for machining radial holes of cylinder liner holes of cylinder parts such as diesel engine cylinder liner. When machining radial holes of cylinder liner holes of cylinder parts such as cylinder liner, the cutter tool of the radial hole adopts a customized special cutter tool, and is completed under the positioning and guiding control of the drill sleeve 2. The machined radial holes have good consistency and guaranteed accuracy.

[0018] 3. The radial hole machining tool of the present invention is specially used for machining radial holes of cylinder liner holes of cylinder parts such as diesel engine cylinder liner. When machining radial holes of cylinder liner holes of cylinder parts such as cylinder liner, the radial holes are machined by using a special drilling die and a special knife tool to simplify the positioning and control during the machining process. The operation is simple, the work efficiency is high, and the labor intensity is low.

[0019] 4. The radial hole processing tool of the present invention is specially used for cylinder liner holes of cylinder parts such as diesel engine cylinder liners. It is easy to use, simple in structure, low in cost, and safe and reliable. For the radial hole processing of different cylinder liners of different diesel engine models, it is only necessary to replace the corresponding sleeve-shaped drill template and drilling tool to complete the new radial hole processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the axial section of the radial hole machining tool of the cylinder liner;

[0021] Figure 2 It is a schematic diagram of the radial cross section of the processing tool;

[0022] Figure 3 It is an axial cross-sectional view of a sleeve-shaped drilling template;

[0023] Figure 4 for Figure 3 Cross-sectional view at AA and CC;

[0024] Figure 5 for Figure 3 Cross-section at the middle BB;

[0025] Figure 6 is a schematic diagram of the axial cross section of the drill sleeve;

[0026] Figure 7 is a top view of the drill sleeve;

[0027] Figure 8 is a schematic cross-sectional view of a magnetic drill base plate;

[0028] Fig. 9 is a top view of the magnetic drill base plate;

[0029] Fig.10 A schematic diagram of the positioning pin. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The invention discloses a radial hole machining tool for an engine cylinder sleeve. The radial hole machining tool comprises a drilling jig basic component, a positioning component and a hoisting component.

[0032] Among them, the basic components of the drill template include a sleeve-shaped drill template body 1, a drill sleeve 2, and a magnet drill base plate 3, wherein the sleeve-shaped drill template body 1 is a cylindrical sleeve-shaped structure, and a drill sleeve hole 11 is radially opened on the sleeve wall adjacent to one end of the sleeve-shaped drill template body 1 and is used for installing the drill sleeve 2; the magnet drill base plate 3 is detachably installed on the inner surface of the sleeve wall at the other end of the sleeve-shaped drill template body 1, and the magnet drill base plate 3 is spaced apart on the same side of the drill sleeve 2.

[0033] Furthermore, a drill sleeve positioning screw hole 14 is provided at the bottom of the sleeve wall of the sleeve-shaped drill template body 1 adjacent to the drill sleeve hole 11 for installing the drill sleeve screw 8 and quickly positioning the drill sleeve 2 .

[0034] Furthermore, the drill sleeve 2 includes a cylindrical drill sleeve body 21 and a drill sleeve flange 22 with a notch 23. The drill sleeve flange 22 is integrally arranged at one end of the cylindrical drill sleeve body 21. The notch 23 is used for quick adaptation and positioning with the drill sleeve screw 8. The outer edge of the other end of the cylindrical drill sleeve body 21 is chamfered.

[0035] Furthermore, a drill sleeve hole 11 is respectively provided on the front and rear sides of the drill sleeve positioning screw hole 14 .

[0036] Furthermore, the magnet drill seat plate 3 is an arc plate 31 with an arc bottom surface and a flat top surface. Two countersunk holes 32 are provided on the magnet drill seat plate 3 at intervals from the top surface to the bottom surface, and the arc surface of the arc plate 31 matches the inner hole surface of the sleeve-shaped drilling template 1; two seat plate positioning screw holes 15 are provided at the bottom of the sleeve-shaped drilling template 1 corresponding to the two countersunk holes 32; two seat plate screws 4 pass through the countersunk holes 32 and the seat plate positioning screw holes 15 to detachably install the magnet drill seat plate 3 on the inner hole surface of the sleeve-shaped drilling template 1.

[0037] The positioning assembly is detachably mounted on the inner wall surface of the sleeve wall of the sleeve-shaped drilling template 1 and is used for positioning the processing tool relative to the cylinder sleeve to be processed.

[0038] Further, the positioning assembly includes three set screws 5, and a positioning screw hole 12 is respectively provided at the top of the sleeve wall and the two sides of the top at a positioning angle α for installation with the three set screws 5. The positioning angle α is preferably 120 degrees.

[0039] Wherein, the hoisting assembly is installed on the outer wall surface of the sleeve wall of the sleeve-shaped drilling template body 1 opposite to the drill sleeve 2.

[0040] Furthermore, the lifting assembly includes a lifting screw 7, and a lifting hole 13 is opened at the top of the sleeve wall passing through the geometric center of gravity of the sleeve-shaped drilling template body 1 for installation with the lifting screw 7. The lifting screw 7 includes a lifting ear body and a screw body.

[0041] The processing tool further comprises a positioning pin 6 for auxiliary positioning, and a pin hole 16 is provided on the mold body wall of the sleeve-shaped drill mold body 1 perpendicular to the drill sleeve hole 11 for inserting the positioning pin 6 and auxiliary positioning.

[0042] Furthermore, the positioning pin 6 includes a positioning pin rod 61 and a plug rod 62 . The plug rod 62 is inserted into the pin hole 16 , and the outer diameter of the positioning pin rod 61 is smaller than the inner hole of the drill sleeve 2 .

[0043] The above-mentioned processing tool is mainly used for processing radial holes of cylinder liners of low-speed marine diesel engines. In one embodiment, for processing radial temperature sensor mounting holes of RT40 diesel engine cylinder liner test pieces, the dedicated RT40 cylinder liner radial hole processing tool is composed of a sleeve-shaped drill template 1, a drill sleeve 2, a magnet drill seat plate 3, a seat plate screw 4, a set screw 5, a positioning pin 6, a lifting screw 7 and a drill sleeve screw 8 and other components.

[0044] The radial hole machining method of RT40 cylinder liner is carried out in the following steps.

[0045] The first step is to place the workpiece RT40 cylinder liner flat on the V-frame so that the axis of the cylinder liner hole is basically horizontal, and rotate the cylinder liner so that the radial hole to be processed is at the bottom.

[0046] The second step is to place the cylinder liner radial hole processing tool, i.e., the drill jig plug, into the position of the radial hole to be processed in the cylinder liner hole, move and rotate the drill jig so that the center of the drill sleeve on the drill jig is aligned with the first radial hole to be processed in the cylinder hole, and then tighten the three set screws 5 on the drill jig to fix the drill jig at the processing position in the cylinder liner hole, thereby completing the positioning of the first radial hole processing.

[0047] The third step is to install the horizontal magnetic drill plug onto the magnetic drill base plate 3 of the drill jig, adjust the position of the horizontal magnetic drill so that its drill axis is aligned with the center of the drill sleeve of the drill jig, and then turn on the magnetic switch to make the magnetic drill stick and fix on the magnetic drill base plate 3 of the drill jig.

[0048] The fourth step is to install special hole processing tools (such as drill bits, reamer) on the magnetic drill shaft to complete the drilling and reaming of the radial hole as required.

[0049] The fifth step is to loosen the three fixing screws 5 on the drill jig to loosen the drill jig and the cylinder liner, then rotate the cylinder liner and the drill jig and insert the positioning pins 6 through the pin holes on the sleeve-shaped drill jig body 1 into the processed radial holes, so that the center of the drill sleeve on the drill jig is aligned with the next radial hole to be processed in the cylinder hole, and then tighten the fixing screws 5 on the drill jig to fix the drill jig again at the processing position in the cylinder liner hole. After completing the positioning of the next radial hole processing, the drilling and reaming of the hole can be carried out.

[0050] In this way, the radial holes are processed one by one until they are all completed.

[0051] In summary, the present invention solves the problems of poor consistency in the processing of radial temperature sensor mounting holes of RT40 diesel engine cylinder liner test pieces, difficulty in ensuring quality, and low processing efficiency. The cylinder liner radial hole processing tool has a simple structure, is easy to use, and has high efficiency, low cost, and is safe and reliable.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A radial hole machining tool for an engine cylinder liner, characterized in that: The radial hole processing tool comprises a basic drilling jig assembly, a positioning assembly and a hoisting assembly. The basic assembly of the drilling template comprises a sleeve-shaped drilling template body (1), a drill sleeve (2), and a magnet drill base plate (3), wherein the sleeve-shaped drilling template body (1) is a cylindrical sleeve-shaped structure, and a drill sleeve hole (11) is radially opened on the sleeve wall adjacent to one end of the sleeve-shaped drilling template body (1) and is used for installing the drill sleeve (2); the magnet drill base plate (3) is detachably installed on the inner surface of the sleeve wall at the other end of the sleeve-shaped drilling template body (1), and the magnet drill base plate (3) and the drill sleeve (2) are spaced apart on the same side; The positioning assembly is detachably mounted on the inner wall surface of the sleeve wall of the sleeve-shaped drilling template (1) and is used to position the processing tool relative to the cylinder sleeve to be processed; The hoisting assembly is mounted on the outer wall surface of the sleeve wall of the sleeve-shaped drill template body (1) opposite to the drill sleeve (2); The positioning assembly comprises three set screws (5), and a positioning screw hole (12) is respectively provided at the top of the sleeve wall and at both sides of the top at a positioning angle α for installation with the three set screws (5); The magnet drill seat plate (3) is an arc plate (31) with an arc bottom surface and a flat top surface. Two countersunk holes (32) are provided on the magnet drill seat plate (3) at intervals from the top surface to the bottom surface. The arc surface of the arc plate (31) matches the inner hole surface of the sleeve-shaped drilling template (1). Two seat plate positioning screw holes (15) are provided at the bottom of the sleeve-shaped drilling template (1) corresponding to the two countersunk holes (32). Two seat plate screws (4) pass through the countersunk holes (32) and the seat plate positioning screw holes (15) to detachably mount the magnet drill seat plate (3) on the inner hole surface of the sleeve-shaped drilling template (1). The processing tool also includes a positioning pin (6) for auxiliary positioning, and a pin hole (16) is provided on the mold body wall of the sleeve-shaped drill mold body (1) perpendicular to the drill sleeve hole (11) for inserting the positioning pin (6) and auxiliary positioning.

2. The cylinder liner radial hole machining tool according to claim 1, characterized in that: The lifting assembly comprises a lifting screw (7), and a lifting hole (13) is provided at the top of the sleeve wall passing through the geometric center of gravity of the sleeve-shaped drilling template (1) for installation with the lifting screw (7).

3. The cylinder liner radial hole machining tool according to claim 1, characterized in that: A drill sleeve positioning screw hole (14) is provided at the bottom of the sleeve wall of the sleeve-shaped drill template (1) adjacent to the drill sleeve hole (11) for installing a drill sleeve screw (8) and quickly positioning the drill sleeve (2).

4. The cylinder liner radial hole machining tool according to claim 3, characterized in that: The drill sleeve (2) comprises a cylindrical drill sleeve body (21) and a drill sleeve flange (22) with a notch (23); the drill sleeve flange (22) is integrally arranged at one end of the cylindrical drill sleeve body (21); the notch (23) is used for quick fitting and positioning with the drill sleeve screw (8); and the outer edge of the other end of the cylindrical drill sleeve body (21) is chamfered.

5. The cylinder liner radial hole machining tool according to claim 3 or 4, characterized in that: A drill sleeve hole (11) is respectively provided on the front and rear sides of the drill sleeve positioning screw hole (14).

6. The cylinder liner radial hole machining tool according to claim 1, characterized in that: The positioning pin (6) comprises a positioning pin rod (61) and a plug rod (62); the plug rod (62) is inserted into the pin hole (16); and the outer diameter of the positioning pin rod (61) is smaller than the inner hole of the drill sleeve (2).

7. A method for machining radial holes of cylinder liners using the engine cylinder liner radial hole machining tool as claimed in claim 1, characterized in that: The method comprises the following steps: S1 Initial positioning of the cylinder liner: Place the cylinder liner to be processed flat on the V-shaped frame and make the axis of the cylinder liner hole horizontal. Rotate the cylinder liner so that the radial hole to be processed is at the bottom. S2 Radial hole positioning: assemble the processing tool and put the processing tool plug into the cylinder liner hole, move and rotate the processing tool so that the drill sleeve center of the drill sleeve (2) is aligned with the radial hole to be processed in the cylinder hole, tighten the three set screws (5) to fix the processing tool at the position to be processed in the cylinder liner hole, and complete the positioning of the first radial hole processing; S3 Install the magnetic drill, install the horizontal magnetic drill plug onto the magnetic drill base plate (3) of the processing tool, adjust the position of the horizontal magnetic drill so that its drill shaft is aligned with the center of the drill sleeve (2), and turn on the magnetic switch so that the magnetic drill is fixed on the magnetic drill base plate (3); S4 Radial hole processing: install the hole processing tool on the magnetic drill shaft, start the magnetic drill to complete the processing of the first radial hole; loosen the three set screws (5) to loosen the processing tool and the cylinder sleeve, rotate the cylinder sleeve, and insert the positioning pin (6) through the pin hole (16) on the sleeve-shaped drill template (1) into the processed radial hole, so that the center of the drill sleeve (2) is aligned with the next radial hole to be processed on the cylinder sleeve, and repeat the drilling process until all radial holes are processed; S5 Disassembly: first remove the tool, then flip the magnetic switch to remove the horizontal magnetic drill, loosen the set screw (5), and remove the processing tool.

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