Auxiliary tool for machining pin hole of piston of marine diesel engine

Abstract

According to the auxiliary tool for machining the piston pin hole of the marine diesel engine, the part, protruding out of an assembly spigot, of the top of a piston is located on the upper end face of a locating disc and located in a sinking groove in the inner side of a spigot locating ring table, and the assembly spigot and the spigot locating ring table are in circumferential locating connection through a locating assembly; a pressing plate used for being matched with a conical ring face in an inner cavity in the top of the piston and pressing the piston is further arranged on the upper portion of the positioning disc, a double-end bolt is vertically fixed to the center of the positioning disc, and the upper end of the double-end bolt penetrates through a center hole in the pressing plate to be connected with a nut in a matched mode. By designing the clamping and positioning tool for machining the piston pin hole, the precise machining effect of high straightness of the piston pin hole of the diesel engine is achieved, the machining quality and machining efficiency of the piston pin hole of the diesel engine are effectively improved, the auxiliary time for alignment and clamping of the piston pin hole machined on a pin hole boring machine is shortened, and the machining efficiency of the piston pin hole is improved. The machining quality of the diesel engine piston pin hole is improved, and the production time, the assembly quality and the service life of the diesel engine piston are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing, and in particular relates to an auxiliary tooling for processing a piston pin hole of a marine diesel engine. Background Art

[0002] The piston is one of the key parts of a diesel engine. The processing of the piston pin hole of the diesel engine (mainly because the piston pin hole is placed with the bottom surface of the piston facing upward during processing, and the piston pin hole is processed by butting the two ends after the machine tool table rotates 180°, which makes clamping difficult. At the same time, the piston pin hole size, shape and position tolerance and other processing factors have high requirements) is one of the difficulties and bottlenecks in the entire piston processing. At the same time, the precision requirement is high. When processing the piston pin hole, the cylindricity of the hole and the verticality relative to the center of the piston are difficult to ensure. There are technical bottlenecks during processing, and it is troublesome to align before processing. At the same time, the piston top ring surface needs to be placed downward during processing. Because the contact surface is too small, it cannot be placed on the machine tool table, which leads to great difficulty in processing the piston pin hole and low efficiency in processing the piston pin hole. The problem of out-of-tolerance straightness when the two ends of the piston pin hole are butted during processing causes the problem to be exposed during the diesel engine assembly process, which seriously restricts the normal production of the diesel engine piston. Therefore, it is necessary to make improvements to solve the above technical problems. Utility Model Content

[0003] The technical problem solved by the utility model is as follows: to provide an auxiliary tooling for processing the piston pin hole of a marine diesel engine. By designing a clamping and positioning tooling for processing the piston pin hole, a precise processing effect of a high straightness of the diesel engine piston pin hole is achieved. The utility model has a simple structure, is convenient to disassemble and use, and is easy to process and manufacture. The processing quality and efficiency of the diesel engine piston pin hole can be effectively improved, the auxiliary time for alignment and clamping of the piston pin hole on a pin hole boring machine can be shortened, the processing quality of the diesel engine piston pin hole can be improved, and the production time, assembly quality and service life of the diesel engine piston can be improved.

[0004] The technical solution adopted by the utility model is as follows: an auxiliary tooling for processing a piston pin hole of a marine diesel engine comprises a positioning plate detachably fixed on a machine tool workbench, a stopper positioning ring stage for matching with an assembly stopper on a piston top and centering the stopper, and a portion of the piston top protruding from the assembly stopper is located on an upper end surface of the positioning plate and in a recessed groove on an inner side of the stopper positioning ring stage, the assembly stopper and the stopper positioning ring stage are connected in circumferential positioning via a positioning assembly, a pressure plate for matching with a conical annular surface in an inner cavity of the piston top and for pressing the piston is further provided on the upper portion of the positioning plate, a stud bolt is vertically fixed at the center position of the positioning plate, and the upper end of the stud bolt passes through a center hole on the pressure plate and is matched with a nut for connection.

[0005] Among them, a plurality of connection blocks are fixed on the machine tool workbench, the lower ends of the connection blocks are connected to the machine tool workbench through positioning keys, and the upper ends of the connection blocks are detachably connected to the positioning plate through cylindrical clamping bolts.

[0006] Furthermore, the positioning disk is a multi-level stepped disk structure, and the circumferences of the plurality of connecting blocks are evenly distributed on the outer circumference of the lower end surface of the positioning disk, and the lower end surface of the positioning disk is in contact with the upper end surface of the machine tool workbench.

[0007] Furthermore, the positioning assembly includes a positioning pin and a diamond pin, and the upper end surface of the stop positioning ring platform is provided with a positioning pin and a diamond pin located on the same center line, and the positioning pin and the diamond pin are respectively adapted to be connected with the circular holes and diamond pin holes at corresponding positions on the bottom surface of the assembly stop.

[0008] Furthermore, the center line connecting the positioning pin and the diamond pin is parallel to the radial center line of the pin hole to be processed of the piston.

[0009] The advantages of this utility model compared with the prior art:

[0010] 1. This technical solution achieves the high straightness and precision processing effect of the diesel engine piston pin hole by designing a clamping and positioning tool for piston pin hole processing. It has a simple structure, is easy to disassemble and use, and is easy to process and manufacture;

[0011] 2. This technical solution positions the piston through a positioning pin and a diamond pin whose center line is parallel to the radial center line of the piston pin hole to be processed, providing conditions for rapid positioning of the piston and the positioning plate, facilitating rapid clamping and fixing by the pressure plate and the positioning plate, and improving the piston clamping efficiency;

[0012] 3. This technical solution effectively improves the processing quality and efficiency of the diesel engine piston pin hole, shortens the auxiliary time of alignment and clamping of the piston pin hole on the pin hole boring machine, improves the processing quality of the diesel engine piston pin hole, and improves the production time, assembly quality and service life of the diesel engine piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the front view of the structure of the utility model;

[0014] Figure 2 It is a top view of the structure of the utility model. DETAILED DESCRIPTION

[0015] The following will be combined with the embodiment of the present utility model Figure 1-2, clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] It should be noted that, in this document, unless otherwise stated, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc., are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0017] In this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further limitations. The elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0018] Auxiliary tooling for machining piston pin holes of marine diesel engines, such as Figure 1-2 As shown, it includes a positioning plate 1 that is detachably fixed on a machine tool workbench 10, and a stopper positioning ring 1-1 is provided around the upper part of the positioning plate 1 for adapting to the assembly stopper 11-1 on the top of the piston 11 and centrally positioning it, and the portion of the top of the piston 11 protruding from the assembly stopper 11-1 is located on the upper end surface of the positioning plate 1 and in a recessed groove 1-2 on the inner side of the stopper positioning ring 1-1, and the assembly stopper 11-1 is circumferentially positioned and connected with the stopper positioning ring 1-1 through a positioning assembly, and the positioning plate 1 is also provided with a pressing plate 3 on the upper part thereof, which is used to match with the conical annular surface 11-2 in the inner cavity at the top of the piston 11 and to press the piston 11. A stud bolt 2 is vertically fixed at the center of the positioning plate 1, and the upper end of the stud bolt 2 passes through the center hole on the pressing plate 3 and is matched and connected with the nut 4. In the above structure, by designing a clamping and positioning tool for machining the pin hole 12 of the piston 11, a high straightness precision machining effect of the pin hole 12 of the diesel engine piston 11 is achieved, the structure is simple, the disassembly and assembly are convenient, and the processing and manufacturing are easy;

[0019] Among them, the detachable fixed connection structure between the machine tool worktable 10 and the positioning plate 1 is specifically as follows: a plurality of connecting blocks 8 are fixed on the machine tool worktable 10, the lower ends of the connecting blocks 8 are connected to the machine tool worktable 10 through positioning keys 9, and the upper ends of the connecting blocks 8 are detachably fixed to the positioning plate 1 through cylindrical clamping bolts 7.

[0020] The specific structure of the positioning disk 1 is as follows: the positioning disk 1 is a multi-level stepped disk structure, and the plurality of connecting blocks 8 are evenly distributed on the circumference of the lower end surface of the positioning disk 1 , and the lower end surface of the positioning disk 1 contacts the upper end surface of the machine tool worktable 10 .

[0021] The specific structure of the positioning component is as follows: the positioning component includes a positioning pin 6 and a diamond pin 5, and the upper end surface of the stop positioning ring platform 1-1 is provided with a positioning pin 6 and a diamond pin 5 located on the same center line, and the positioning pin 6 and the diamond pin 5 are respectively adapted to be connected with the circular holes and diamond pin holes at corresponding positions on the bottom surface of the assembly stop 11-1.

[0022] The center line of the positioning pin 6 and the diamond pin 5 is parallel to the radial center line of the pin hole 12 to be processed of the piston 11, and the center line of the positioning pin 6 and the diamond pin 5 is parallel to the length direction of the machine tool worktable 10, so as to ensure that the pin hole 12 to be processed is coaxial with the machine tool spindle by adjusting the machine tool worktable 10, so as to realize the one-time forming processing of the pin hole 12 to be processed on the piston 11 by the spindle; in the above structure, the piston 11 is positioned by the positioning pin 6 and the diamond pin 5 whose center line is parallel to the radial center line of the pin hole of the piston 11 to be processed, so as to provide conditions for the rapid positioning of the piston 11 and the positioning plate 1, and facilitate the rapid pressing and fixing of the positioning plate 1 by the pressure plate 3, thereby improving the piston clamping efficiency;

[0023] Usage: First, clean and wipe the machine tool workbench, and use the positioning key 9 to install the connecting block 8 on the machine tool workbench 10 (i.e., the pin hole boring machine workbench); then use the cylindrical clamping bolt 7 to assemble the positioning plate 1 on the connecting block 8, and then install the diamond pin 5 and the cylindrical pin 6 together on the positioning plate 1, and screw in the stud bolt 2; finally, pass the top of the diesel engine piston 11 downward through the stud bolt 2, align the diamond pin 5 and the cylindrical pin 6, and then pre-tighten with the pressure plate 3 and the nut 4, align and tighten the nut 4; in this way, the workpiece to be processed can be processed on the diesel engine piston 11 Pin hole 12, after the processing elements of piston pin hole 12 are processed, loosen and screw out nut 4, remove pressure plate 3, remove diesel engine piston 11, screw out stud 2, remove locating plate 1, remove cylindrical clamping bolt 7, remove connecting block 8, and take out locating key 9; in this way, the processing of diesel engine piston pin hole 11 is realized (mainly when processing piston pin hole, the bottom surface of piston is placed upward, and the piston pin hole is processed by rotating the machine tool worktable 180° and then docking the two ends, which makes clamping difficult, and at the same time, the processing elements such as piston pin hole size and shape and position tolerance have high requirements).

[0024] Since the fixture is an integral whole, the positioning plate 1, the piston 11 and the machine tool worktable 10 are used together in combination, that is, the top annular surface of the piston 11 is adjusted into a large plane, and the principle of processing with two pins on one side is adopted to avoid convenient processing, back and forth clamping and disassembly during the processing, thereby ensuring the processing quality of the diesel engine piston pin hole; during manufacturing, the tooling number and the size of the processed hole and the assembly order are marked on the side surface of the fixture body, so that workers can be guided to use it correctly.

[0025] The technical solution ensures the stability of the process for processing the pin hole of the diesel engine piston 11, facilitates alignment during the processing, and can complete the processing elements of the diesel engine pin hole 11 at one time, effectively improving the processing quality and processing efficiency of the diesel engine piston 11 pin hole, shortening the auxiliary time for alignment and clamping of the piston 11 pin hole on the pin hole boring machine, improving the processing quality of the diesel engine piston 11 pin hole, and the processing size and position accuracy can meet the requirements of the product drawings, ensuring the processing quality of the diesel engine piston pin hole processing elements, and improving the production time, assembly quality and service life of the diesel engine piston 11.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0027] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. Auxiliary tooling for processing piston pin holes of marine diesel engines, characterized by: The invention comprises a positioning plate (1) which is detachably fixed on a machine tool worktable (10); a stopper positioning ring platform (1-1) is provided around the upper part of the positioning plate (1) for matching with an assembly stopper (11-1) at the top of a piston (11) and for center positioning the stopper; a portion of the top of the piston (11) protruding from the assembly stopper (11-1) is located on the upper end surface of the positioning plate (1) and in a recessed groove (1-2) on the inner side of the stopper positioning ring platform (1-1); the assembly stopper (11-1) and the stopper positioning ring platform (1-1) are circumferentially positioned and connected via a positioning assembly; a pressing plate (3) is also provided on the upper part of the positioning plate (1) for matching with a conical annular surface (11-2) in the inner cavity of the top of the piston (11) and for pressing the piston (11); a stud bolt (2) is vertically fixed at the center of the positioning plate (1); the upper end of the stud bolt (2) passes through a center hole on the pressing plate (3) and is matched and connected with a nut (4).

2. The auxiliary tooling for machining a piston pin hole of a marine diesel engine according to claim 1, characterized in that: A plurality of connection blocks (8) are fixed on the machine tool worktable (10); the lower ends of the connection blocks (8) are connected to the machine tool worktable (10) via positioning keys (9), and the upper ends of the connection blocks (8) are detachably fixedly connected to the positioning plate (1) via cylindrical clamping bolts (7).

3. The auxiliary tooling for machining a piston pin hole of a marine diesel engine according to claim 2, characterized in that: The positioning disk (1) has a multi-level stepped disk structure, and a plurality of the connecting blocks (8) are evenly distributed on the circumference of the lower end surface of the positioning disk (1), and the lower end surface of the positioning disk (1) is in contact with the upper end surface of the machine tool worktable (10).

4. The auxiliary tooling for machining a piston pin hole of a marine diesel engine according to any one of claims 1 to 3, characterized in that: The positioning assembly comprises a positioning pin (6) and a diamond pin (5); the upper end surface of the stopper positioning ring platform (1-1) is provided with a positioning pin (6) and a diamond pin (5) located on the same center line, and the positioning pin (6) and the diamond pin (5) are respectively adapted to be connected with a circular hole and a diamond pin hole at corresponding positions on the bottom surface of the assembly stopper (11-1).

5. The auxiliary tooling for machining a piston pin hole of a marine diesel engine according to claim 4, characterized in that: The center line connecting the positioning pin (6) and the diamond pin (5) is parallel to the radial center line of the pin hole (12) to be processed of the piston (11).

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