Diesel engine base main bearing bolt hole machining device and method

Abstract

The diesel engine base main bearing bolt hole machining device comprises a gantry milling mechanism, power equipment of the gantry milling mechanism is connected with a main shaft, and the diesel engine base main bearing bolt hole machining device is characterized in that a rotating component is arranged at the bottom end of a shell of the power equipment, and a moving part of the rotating component is fixedly connected with one end of a shell of an accessory head; a transmission mechanism capable of transmitting power in the radial direction of the main shaft is arranged in the accessory head, the input end of the transmission mechanism is connected with the main shaft, the output end of the transmission mechanism is connected with a drilling tool arranged at the other end of the accessory head, and the machining quality of the bolt hole is improved by adopting the machining device.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine base processing, and in particular to a device and method for processing bolt holes of a main bearing of a diesel engine base. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The engine base of a large series of ultra-long stroke diesel engines refers to a base in which the distance between the bottom of the main shaft bolt hole and the top surface of the base is not less than 1120mm. The main bearing bolt hole of the base is relatively long from the top surface of the base. At the same time, the distance from the center of the hole to the side is limited. The large-diameter extension sleeve cannot be used and the tool is forced to be lengthened. Taking one type of engine base as an example, the distance between the bottom of the main bearing bolt hole and the top surface is 1285mm. The lengthening of the drilling tool has a great impact on the processing quality and efficiency, and is accompanied by increased quality risks. Specifically, the use of extended deep drilling tools for processing will weaken the rigidity of the tool and limit the number of revolutions, which usually results in poor center positioning, poor roughness of the processed hole wall, and inconsistent hole verticality. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a diesel engine base main bearing bolt hole processing device and method, which overcomes the defects of the current use of extended deep drilling tool processing.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: In the first aspect, an embodiment of the present invention provides a diesel engine base main bearing bolt hole processing device, including a gantry milling processing mechanism, wherein the power equipment of the gantry milling processing mechanism is connected to the main shaft, and a rotating component is provided at the bottom end of the shell of the power equipment, and the moving part of the rotating component is fixedly connected to one end of the shell of the accessory head. A transmission mechanism capable of transmitting power along the radial direction of the main shaft is provided inside the accessory head, the input end of the transmission mechanism is connected to the main shaft, and the output end of the transmission mechanism is connected to a drill tool arranged at the other end of the accessory head.

[0006] Optionally, the transmission mechanism adopts a gear transmission mechanism, including a plurality of gears arranged radially along the main shaft and meshing in sequence, wherein the main shaft is connected to the input end gear, the output end gear is connected to the output shaft, and the output shaft is detachably connected to the drill tool through a clamp.

[0007] Optionally, the rotating part includes a fixed part and a rotating part, the rotating part is rotatably connected to the fixed part and a locking part is provided between the rotating part and the fixed part, and the rotating part is fixedly connected to one end of the accessory head shell.

[0008] Optionally, the rotating component adopts an electric hollow rotating platform.

[0009] Optionally, the drilling tool is a U drill, a fine boring tool, a twist drill, a chamfer drill, or a chip tap.

[0010] Optionally, the axis of the rotating component is coaxially arranged with the axis of the main shaft.

[0011] In a second aspect, an embodiment of the present invention provides a method for machining a main bearing bolt hole of a diesel engine base according to the first aspect, comprising the following steps: Step 1: Install the drilling tool at the output end of the transmission mechanism; Step 2: The gantry drilling and milling mechanism drives the power equipment to sink to the set position inside the machine base groove to be processed; Step 3: The rotary component drives the attachment head to rotate so that the drill tool corresponds to the position of the hole to be drilled; Step 4: The power equipment of the gantry drilling and milling mechanism drives the main shaft to rotate, and the main shaft drives the drill to rotate through the transmission mechanism. At the same time, the gantry drilling and milling mechanism drives the power equipment to feed, and the drill performs drilling processing on the machine base to form the main bolt hole.

[0012] Optionally, the main bolt hole includes a countersink, a bottom hole and a bottom cone, which are processed in sequence from top to bottom. After the bottom cone is processed, the threaded hole chamfer is processed on the top of the bottom hole, and finally the internal thread structure is processed on the bottom hole. Accordingly, when processing the countersink, a countersink processing drill is installed at the output end of the transmission mechanism. When processing the bottom hole, a bottom hole processing drill is installed at the output end of the transmission mechanism. When processing the threaded hole chamfer, a chamfer drill is installed at the output end of the transmission mechanism. When processing the internal thread structure, a chip tap is installed at the output end of the transmission mechanism. Optionally, during countersinking, a U drill is first installed at the output end of the transmission mechanism as a countersinking drill tool to perform rough processing on the countersink. After the rough processing is completed, a fine boring tool is installed at the output end of the transmission mechanism as a countersinking drill tool to perform fine processing on the countersink.

[0013] Optionally, when processing the bottom hole, first install a U drill as a bottom hole processing drill tool at the output end of the transmission mechanism to perform rough processing on the bottom hole. After the rough processing is completed, install a fine boring tool as a bottom hole processing drill tool at the output end of the transmission mechanism to perform fine processing on the bottom hole.

[0014] The beneficial effects of the present invention are as follows: The processing device and method of the present invention are provided with an accessory head arranged along the radial direction of the main shaft, the main shaft and the accessory head can enter the groove of the machine base, and a drilling tool is provided at the radial outer end of the accessory head, which is connected to the output end of the transmission mechanism in the accessory head, and the input end of the transmission mechanism is connected to the main shaft. Since the accessory head and the main shaft can enter the groove of the machine base, a shorter shallow hole drilling tool can be used to install the bolt hole, and there is no need to use an extended deep drilling tool. The rigidity of the tool is significantly enhanced to solve the problems of weakened rigidity of the drilling tool due to the extended tool, poor center positioning caused by limited number of revolutions, poor roughness of the processed hole wall, etc., effectively improving the quality of the main bearing bolt hole, reducing the risk of processing quality, and at the same time, the number of revolutions will not be limited, the efficiency has been greatly improved, directly improving the processing efficiency and reducing the processing time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention; Figure 2 This is a front view of the assembly of the rotary component, accessory head and drilling tool in embodiment 1 of the present invention; Figure 3 This is a top view of the assembly of the rotary component, accessory head and drilling tool in Example 1 of the present invention; Figure 4 This is a schematic diagram of the internal transmission mechanism of the accessory head according to embodiment 1 of the present invention; Figure 5 Schematic diagram of the bolt holes to be processed in Example 2 of the present invention; Among them, 1. Accessory head, 2. Drilling tool, 3. Power equipment, 4. Machine base, 5. Rotating part, 6. Main shaft, 7. Transmission mechanism, 8. Output shaft. DETAILED DESCRIPTION

[0017] Example 1 This embodiment provides a diesel engine base main bearing bolt hole processing device, such as Figure 1-Figure 3As shown, it includes a gantry drilling and milling mechanism. In this embodiment, the gantry drilling and milling mechanism can adopt the existing gantry drilling and milling machine, including a power device 3. The bottom of the power device is connected to a main shaft. The power device 3 can drive the main shaft 6 to rotate around its own axis. The power device 3 is connected to the vertical lifting component. The vertical lifting component can drive the power device to move vertically. The vertical lifting component is connected to the first horizontal motion component. The first horizontal motion component can drive the vertical lifting component to move along the first horizontal direction. A workbench is provided under the main shaft 6. The workbench is used to fix the diesel engine base for fixing the bolt holes to be processed. The workbench is connected to the second horizontal motion component. The second horizontal motion component can drive the workbench to move along the second horizontal direction. The second horizontal direction is perpendicular to the first horizontal direction.

[0018] The above structure can adopt the structure of the existing gantry drilling and milling machine, and its further technical details are not described in detail here. This embodiment is improved on the basis of the current gantry drilling and milling machine.

[0019] The bottom end of the housing of the power device 3 is fixedly connected to one end of the accessory head 1 , and the accessory head 1 is arranged along the radial direction of the main shaft 6 .

[0020] In this embodiment, the accessory head 1 includes a shell, the inner end of the shell is connected to the rotating part of the rotating component 5 arranged at the bottom end of the shell of the power equipment 3, and the rotating component 5 is coaxially arranged with the main shaft. The rotating component 5 can drive the accessory head to rotate along the axis of the main shaft.

[0021] In this embodiment, the rotating component 5 includes an annular fixed portion and an annular rotating portion rotatably connected to the fixed portion. Specifically, the fixed portion is sleeved on the outer periphery of the rotating portion, the inner side surface of the fixed portion is provided with an annular groove, and the rotating portion is provided with an annular protrusion embedded in the annular groove. The fixed portion and the rotating portion are rotatably connected through the annular protrusion and the annular groove. The rotating portion can rotate around its own axis. A locking member is provided between the fixed portion and the rotating portion to lock and fix the fixed portion and the rotating portion. In this embodiment, the locking member is a locking bolt, and the fixed portion is threadedly connected with a plurality of locking bolts arranged radially along the fixed portion. By rotating the locking bolt, the rod of the locking bolt can be pressed against the annular boss, thereby realizing locking and fixing between the fixed portion and the rotating portion.

[0022] In this way, after loosening the locking bolt, the swivel portion can be manually rotated to adjust the angle of the accessory head.

[0023] In another embodiment, the rotary component 5 adopts an existing electric hollow rotary platform. The electric hollow rotary platform adopts existing equipment and will not be described in detail here.

[0024] A flange is provided on the top surface of one end of the shell of the accessory head 1, which is fixedly connected to the rotating part of the rotating component 5 through the flange and multiple bolts. The main shaft extends into the interior of the shell of the accessory head 1 and is connected to the input end of the transmission mechanism 7 in the shell, so as to transmit power to the transmission mechanism 7.

[0025] The transmission mechanism 7 can transmit the rotation of the main shaft 6 in the radial direction of the main shaft 6 .

[0026] In this embodiment, Figure 4 As shown, the transmission mechanism 7 includes gears arranged in sequence and meshing along the radial direction of the main shaft, and the axes of the gears are parallel to the axis of the main shaft. The gear at one end serves as the input end gear, which is connected to the main shaft and is used to receive the power of the main shaft. The gear at the other end serves as the output end gear, which is used to connect the output shaft of the accessory head. The remaining gears serve as intermediate gears, which are rotatably connected to the axle fixed to the accessory head housing. The main shaft extends into one end of the accessory head, and the output shaft 8 of the accessory head extends from the other end of the accessory head housing to the bottom of the accessory head housing. A clamp is provided at the bottom end of the output shaft of the accessory head, and the clamp is detachably connected to the drill tool 2, which is used to process bolt holes.

[0027] The fixture can be an existing drilling fixture, and can be used for drilling tools such as U drills, fine boring tools, twist drills, and chamfer drills. Its specific structure will not be described in detail here.

[0028] The size of the housing of the accessory head 1 meets the set requirements, which enables the accessory head to enter the groove inside the diesel engine base.

[0029] In this embodiment, the drilling tool 2 is a shallow hole drilling tool, which can be a U drill, a fine boring tool, a twist drill, a chamfer drill, or a chip tap. Those skilled in the art can select the corresponding drilling tool according to processing requirements.

[0030] With the processing device of this embodiment, since the accessory head 1 and the main shaft 6 can enter the groove of the machine base 4, a shorter shallow hole drill can be used to install the bolt hole, and there is no need to use an extended deep drilling tool. The rigidity of the tool is significantly enhanced to solve the problems of weakened rigidity of the drilling tool due to the extended tool, poor center positioning caused by limited number of revolutions, poor roughness of the processed hole wall, etc., effectively improving the quality of the main bearing bolt hole and reducing the processing quality risk. At the same time, the number of revolutions will not be limited, and the efficiency has been greatly improved, which directly improves the processing efficiency and reduces the processing time.

[0031] Example 2 This embodiment provides a working method of the diesel engine base main bearing bolt hole machining device described in Example 1, along the direction from top to bottom, such as Figure 5 As shown, the bolt hole includes a countersunk hole, a bottom hole and a bottom cone arranged in sequence, wherein the bottom hole is provided with an internal thread structure, and the top of the bottom hole is provided with a threaded hole chamfer.

[0032] The processing method comprises the following steps: Step 1: Install the drilling tool 2 at the output end of the transmission mechanism; Step 2: The gantry drilling and milling mechanism drives the power device 3 and the accessory head 1 to sink to the set position inside the groove of the machine base 4 to be processed; Step 3: The rotating component 5 drives the accessory head 1 to rotate so that the drilling tool 2 corresponds to the position of the hole to be drilled; Step 4: The power device 3 of the gantry drilling and milling mechanism drives the main shaft 6 to rotate, and the main shaft 6 drives the drill 2 to rotate through the transmission mechanism 7. At the same time, the gantry drilling and milling mechanism drives the power device to feed, and the drill 2 drills on the machine base 4 to form the main bolt hole.

[0033] Among them, the countersink, bottom hole and bottom cone are processed in sequence. After the bottom cone is processed, the threaded hole chamfer is processed on the top of the bottom hole, and finally the internal thread structure is processed on the bottom hole. Correspondingly, when processing the countersink, the countersink processing drill is installed at the output end of the transmission mechanism. When processing the bottom hole, the bottom hole processing drill is installed at the output end of the transmission mechanism. When processing the threaded hole chamfer, the chamfer drill is installed at the output end of the transmission mechanism. When processing the internal thread structure, the chip tap is installed at the output end of the transmission mechanism. Specifically, the following steps are included: Step a: Install a 1 mm U drill on the fixture of the output shaft 8 of the accessory head 1.

[0034] Step b: the gantry drilling and milling mechanism drives the power device 3 and the accessory head 1 to sink to a set position inside the groove of the machine base 4 to be processed; Step c: The rotating component 5 drives the accessory head 1 to rotate so that the U drill corresponds to the position of the hole to be drilled; Step d: The power equipment 3 of the gantry drilling and milling mechanism drives the main shaft 6 to rotate, and the main shaft 6 drives the U drill to rotate through the transmission mechanism 7. At the same time, the gantry drilling and milling mechanism drives the power equipment 3 to feed, and the U drill performs drilling processing on the machine base 4 to form a countersink. In this step, the countersink is rough-processed using the U drill. After the processing is completed, the power equipment is reset.

[0035] Step e: Replace the U drill with a fine boring tool, repeat steps b to d, and use the fine boring tool to finish the countersink.

[0036] Step f: Replace the fine boring tool with a U drill that is 1 mm smaller than the bottom hole diameter, repeat steps b to d, and use the U drill to rough-machine the bottom hole.

[0037] Step g: Replace the U drill with a fine boring tool that matches the size of the bottom hole, repeat steps b to d, and use the fine boring tool to finish the bottom hole.

[0038] Step h: Replace the fine boring tool with a twist drill that has the same angle as the bottom cone, repeat steps b to d, and use the twist drill to process the bottom cone.

[0039] Step i: Replace the twist drill with a chamfer drill, repeat steps b to d, and use the chamfer drill to chamfer the threaded hole at the top of the bottom hole.

[0040] Step j: Use an extension sleeve to install a flexible tapping sleeve and an internal chip tap on the output shaft 8 of the accessory head 1, repeat steps b to d to tap the bottom hole to form an internal thread structure of the bottom hole.

[0041] The extension sleeve and the flexible tapping sleeve can be made of existing parts, and their specific structures will not be described in detail here. Their assembly and connection methods can also adopt existing technologies.

[0042] After completing step j, the bolt hole processing is completed, and the gantry drilling and milling mechanism drives the machine base 4 to move, and cooperates with the rotating component 5 to process the next bolt hole until all the bolt holes are processed.

[0043] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A diesel engine base main bearing bolt hole processing device, comprising a gantry milling processing mechanism, the power equipment of the gantry milling processing mechanism is connected to the main shaft, characterized in that: A rotating component is provided at the bottom end of the shell of the power equipment, and the moving part of the rotating component is fixedly connected to one end of the shell of the accessory head. A transmission mechanism that can transmit power along the radial direction of the main shaft is provided inside the accessory head. The input end of the transmission mechanism is connected to the main shaft, and the output end of the transmission mechanism is connected to the drilling tool arranged at the other end of the accessory head.

2. A diesel engine base main bearing bolt hole machining device according to claim 1, characterized in that: The transmission mechanism adopts a gear transmission mechanism, which includes multiple gears arranged radially along the main shaft and meshed in sequence, wherein the main shaft is connected to the input end gear, the output end gear is connected to the output shaft, and the output shaft is detachably connected to the drilling tool through a clamp.

3. A diesel engine base main bearing bolt hole machining device according to claim 1, characterized in that: The rotating part includes a fixed part and a rotating part. The rotating part is rotatably connected to the fixed part and a locking part is provided between the rotating part and the fixed part. The rotating part is fixedly connected to one end of the accessory head shell.

4. A diesel engine base main bearing bolt hole machining device according to claim 1, characterized in that: The rotary component adopts an electric hollow rotary platform.

5. A diesel engine base main bearing bolt hole machining device according to claim 1, characterized in that: The drilling tool is a U drill, a fine boring tool, a twist drill, a chamfer drill, or a chip tap.

6. A diesel engine base main bearing bolt hole machining device as claimed in claim 1, characterized in that: The axis of the rotating component is coaxially arranged with the axis of the main shaft.

7. A method for machining a main bearing bolt hole of a diesel engine base according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Install the drilling tool at the output end of the transmission mechanism; Step 2: The gantry drilling and milling mechanism drives the power equipment to sink to the set position inside the machine base groove to be processed; Step 3: The rotary component drives the attachment head to rotate so that the drill tool corresponds to the position of the hole to be drilled; Step 4: The power equipment of the gantry drilling and milling mechanism drives the main shaft to rotate, and the main shaft drives the drill to rotate through the transmission mechanism. At the same time, the gantry drilling and milling mechanism drives the power equipment to feed, and the drill performs drilling processing on the machine base to form the main bolt hole.

8. The method for machining bolt holes of a main bearing of a diesel engine base according to claim 7, characterized in that: The main bolt hole includes a countersink, a bottom hole and a bottom cone which are processed in sequence from top to bottom. After the bottom cone is processed, the threaded hole chamfer is processed on the top of the bottom hole, and finally the internal thread structure is processed on the bottom hole. Accordingly, when processing the countersink, a countersink processing drill is installed at the output end of the transmission mechanism. When processing the bottom hole, a bottom hole processing drill is installed at the output end of the transmission mechanism. When processing the threaded hole chamfer, a chamfer drill is installed at the output end of the transmission mechanism. When processing the internal thread structure, a chip tap is installed at the output end of the transmission mechanism.

9. The method for machining bolt holes of a main bearing of a diesel engine base according to claim 8, characterized in that: When processing the countersink, first install a U drill as a countersink processing drill at the output end of the transmission mechanism to perform rough processing on the countersink. After the rough processing is completed, install a fine boring tool as a countersink processing drill at the output end of the transmission mechanism to perform fine processing on the countersink.

10. The method for machining bolt holes of a main bearing of a diesel engine base according to claim 8, wherein: When processing the bottom hole, first install a U drill as a bottom hole processing drill tool at the output end of the transmission mechanism to perform rough processing on the bottom hole. After the rough processing is completed, install a fine boring tool as a bottom hole processing drill tool at the output end of the transmission mechanism to perform fine processing on the bottom hole.

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