Auxiliary clamping device for excircle profile of diesel engine piston

Abstract

According to the auxiliary clamping device for the excircle profile of the diesel engine piston, a conical sleeve is installed in a center hole of a connecting disc in a matched mode, a positioning disc connected with a conical hole of the conical sleeve in a matched mode is supported on the connecting disc in a positioning mode, and a positioning locking device used for being fixedly connected with the piston in a positioning mode is arranged on the positioning disc. The right end of the piston is provided with a floating supporting plate which is provided with a centering groove and matched with a conical spigot at the port position of the inner cavity of the piston, and the machine tool tailstock abuts against the floating supporting plate to press and fix the floating supporting plate, the piston, the positioning disc and the connecting disc. According to the utility model, the reliable clamping of the piston is realized, the problem that the clamping difficulty is high when a diesel engine or an epicyclic profile is processed is solved, the floating support plate is matched with the spigot at the port position of the inner cavity of the piston, the top ring surface of the piston is compensated to be a plane, the automatic centering function is realized, the alignment time before finish turning of the epicyclic profile is eliminated, and the production efficiency is improved. The requirement for the machining size precision of the diesel engine piston outer circle profile is met, and the reliability and stability of the tool in the using process are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of diesel engines, and in particular relates to an auxiliary clamping device for the outer circular line of a diesel engine piston. 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: an auxiliary clamping device for the outer circular line of a diesel engine piston is provided, which adopts a tapered sleeve and a positioning plate provided with a positioning locking device to reliably position and clamp the piston on a connecting plate fixedly connected to a machine tool chuck, and makes the tailstock of the machine tool press against a floating support plate adapted to a stop at a position of an inner cavity port of the piston, so as to realize reliable clamping of the piston, and solves the problem that clamping is difficult during processing of the outer circular line of a diesel engine or an outer circular line, adopts a structure in which a floating support plate is adapted to a stop at a position of an inner cavity port of the piston, and compensates the top annular surface of the piston into a plane, realizes the function of automatic centering, eliminates the alignment time before fine turning of the outer circular line, facilitates alignment before processing, ensures the dimensional accuracy requirements of the outer circular line of the diesel engine piston, improves the reliability and stability of the tooling during use, has a simple structure, a wide range of use, is easy to operate, and is easy to promote and use.

[0004] The technical solution adopted by the utility model: an auxiliary clamping device for the outer circular line of a diesel engine piston, comprising a connecting plate fixedly connected to a machine tool chuck, a tapered sleeve being adapted to be installed in the center hole of the connecting plate, and a positioning plate adapted to be connected to the tapered hole of the tapered sleeve being positioned and supported on the connecting plate, the positioning plate being provided with a positioning locking device for positioning and fixing the piston, a floating support plate with a centering groove adapted to a tapered stop at the position of its inner cavity port being provided at the right end of the piston, and the tailstock of the machine tool being against the floating support plate to press and fix the floating support plate, the piston and the positioning plate and the connecting plate.

[0005] Wherein, the positioning and locking device includes an inner hole support clamp and a pull rod, and a plurality of inner hole support clamps corresponding to the positions of the through holes on the left end surface of the piston are evenly distributed on the circumference of the right disk surface of the positioning disk, and the inner hole support clamp passes through the through holes at corresponding positions on the piston and extends into the inner cavity of the piston, and is tightened or loosened with the corresponding through hole by adjusting the inner hole support clamp; the pull rod is a T-shaped structure formed by a left-end pressure plate and a pull rod fixed to the middle of the pressure plate, the pressure plate of the pull rod is located in the inner cavity of the piston and contacts with the conical wall at the left end of the inner cavity, and the pull rod of the pull rod passes through the center holes of the piston and the positioning disk and is adaptively connected to the locking nut located in the conical hole of the conical sleeve.

[0006] Furthermore, the pressing plate and the floating support plate of the pull rod are distributed in a cross shape.

[0007] Furthermore, the positioning plate is a multi-step stepped plate, the right end surface of the positioning plate is formed with a groove, and the left end of the piston is located in the groove, and the right end annular surface of the positioning plate is provided with a plurality of diamond pins and cylindrical pins that are adapted to the positioning holes on the left end surface of the piston and are used to position the piston, the small diameter section at the left end of the positioning plate is a tapered section and is adapted to the tapered hole of the tapered sleeve, and the step surface at the left end of the positioning plate abuts against the right end surface of the tapered sleeve.

[0008] Furthermore, at least two circular grooves are formed on the right end surface of the connecting disk, and the positioning block arranged between the connecting disk and the positioning disk is located in the circular groove, and the positioning columns on the left and right end surfaces of the positioning block are respectively adapted to the positioning holes on the connecting disk and the positioning block.

[0009] Furthermore, the conical sleeve is a T-shaped sleeve, and the small diameter section at the left end of the conical sleeve is adapted to the central hole of the connecting disk. The left end surface of the connecting disk is provided with an avoidance groove, and the left ends of the conical sleeve and the positioning locking device do not exceed the avoidance groove.

[0010] The advantages of this utility model compared with the prior art:

[0011] 1. This technical solution adopts a tapered sleeve and a positioning plate with a positioning locking device to reliably position and clamp the piston on a connecting plate fixedly connected to the machine tool chuck, and makes the tailstock of the machine tool press against the floating support plate adapted to the stopper at the position of the piston inner cavity port, so as to realize reliable clamping of the piston and solve the problem of difficulty in clamping during the processing of diesel engines or outer circular lines;

[0012] 2. This technical solution adopts a structure in which the floating support plate is matched with the stopper at the port position of the piston inner cavity, and the piston top ring surface is compensated to a plane, realizing the function of automatic centering, eliminating the alignment time before fine turning of the outer circular line, and facilitating alignment before processing;

[0013] 3. This technical solution has a simple structure, a wide range of applications, and is easy to operate. It ensures the dimensional accuracy requirements of the outer cylindrical line of the diesel engine piston, improves the reliability and stability of the tooling during use, and is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the front view of the structure of the utility model;

[0015] Figure 2 for Figure 1 Middle AA section view. DETAILED DESCRIPTION

[0016] 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.

[0017] 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.

[0018] 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.

[0019] Auxiliary clamping device for the outer round line of diesel engine piston, such as Figure 1-2As shown, it includes a connecting plate 1 fixedly connected to the machine tool chuck, a tapered sleeve 8 is adapted to be installed in the center hole of the connecting plate 1, and a positioning plate 3 adapted to be connected to the tapered hole of the tapered sleeve 8 is positioned and supported on the connecting plate 1, and a positioning locking device for positioning and fixing with a piston 12 is provided on the positioning plate 3, and a floating support plate 6 with a centering groove adapted to the tapered stop at the position of the inner cavity port of the piston 12 is provided at the right end of the piston 12, and the tailstock of the machine tool abuts against the floating support plate 6 to press and fix the floating support plate 6, the piston 12 and the positioning plate 3 to the connecting plate 1; in the above structure, the tapered sleeve 8 is used The piston 12 is reliably positioned and clamped on the connecting plate 1 fixedly connected to the machine tool chuck by the positioning plate 3 provided with a positioning locking device, and the tailstock of the machine tool is pressed against the floating support plate adapted to the stopper at the position of the piston inner cavity port, so that the piston is reliably clamped, which solves the problem of difficulty in clamping during the processing of diesel engines or outer circular lines; the floating support plate 6 is adapted to the stopper at the position of the inner cavity port of the piston 12, and the annular surface of the top (right end) of the piston 12 is compensated to a plane, so as to realize the function of automatic centering, and the alignment time before fine turning outer circular line processing is eliminated, and the alignment before processing is convenient during the processing;

[0020] The specific structure of the positioning locking device is as follows: the positioning locking device includes an inner hole support fixture 7 and a pull rod 10, wherein the inner hole support fixture 7 is a support rod fixedly connected to the right end face of the positioning disk 3 and an adjusting screw whose inner end is threadedly connected to the support rod. A plurality of openings are formed on the circumference of the outer wall of the right end of the support rod, and the threaded connection position of the adjusting screw and the support rod is located on the inner side of the opening, and the conical block positioned at the outer end of the adjusting screw is moved inward by rotating the adjusting screw, and the support rod at the opening position is quickly opened by the conical block, so that the support rod and the through hole on the piston 12 are expanded and fixed, and a plurality of openings are evenly distributed on the circumference of the right disk surface of the positioning disk 3 and the left end surface of the piston 12. The inner hole support fixture 7 corresponds to the through hole position, and the inner hole support fixture 7 passes through the through hole at the corresponding position on the piston 12 and extends into the inner cavity of the piston 12, and the inner hole support fixture 7 is adjusted to make it expand or loosen with the corresponding through hole; the pull rod 10 is a T-shaped structure formed by a left-end pressure plate and a pull rod fixed to the middle of the pressure plate, the pressure plate of the pull rod 10 is located in the inner cavity of the piston 12 and contacts with the conical wall at the left end of the inner cavity, the pull rod of the pull rod 10 passes through the center hole of the piston 12 and the positioning plate 4 and is adaptively connected with the locking nut 11 located in the conical hole of the conical sleeve 8; specifically, the pressure plate of the pull rod 10 and the floating support plate 6 are distributed in a cross shape.

[0021] The positioning structure of the positioning plate 3 and the piston 12 is as follows: the positioning plate 3 is a multi-step stepped plate, the right end surface of the positioning plate 3 is formed with a groove, and the left end of the piston 12 is located in the groove, and the right end annular surface of the positioning plate 3 is provided with a plurality of diamond pins 5 and cylindrical pins 4 that are adapted to the positioning holes on the left end surface of the piston 12 and are used to position the piston 12, the small diameter section at the left end of the positioning plate 3 is a tapered section and is adapted to the tapered hole of the tapered sleeve 8, and the step surface at the left end of the positioning plate 3 abuts against the right end surface of the tapered sleeve 8.

[0022] The positioning connection structure of the connecting disk 1 and the positioning block 2 is specifically as follows: at least two circular grooves are formed on the right end surface of the connecting disk 1, and the positioning block 2 arranged between the connecting disk 1 and the positioning disk 3 is located in the circular groove, and the positioning columns on the left and right end surfaces of the positioning block 2 are respectively adapted to the positioning holes on the connecting disk 1 and the positioning block 2.

[0023] Among them, the conical sleeve 8 is a T-shaped sleeve, and the small diameter section at the left end of the conical sleeve 8 is adapted to the central hole of the connecting disk 1. The left end surface of the connecting disk 1 is provided with an avoidance groove 9, and the left end of the conical sleeve 8 and the positioning locking device do not exceed the avoidance groove 9.

[0024] Usage: Connect the connecting plate 1 and the chuck of the variable ellipse lathe together to process the outer circular line of the diesel engine piston 12. First, install the tapered sleeve 8 on the connecting plate 1, and then install the positioning block 2 on the connecting plate 1 with the M8×25 screw 9. Then assemble the positioning plate 3 on the tapered sleeve 8 and the positioning block 2, and then install the four inner hole support fixtures 7 on the positioning plate 3 respectively; install the cylindrical pin 4 and the diamond pin 5 on the positioning plate 3 respectively, and the fixture body is installed; then align the diesel engine piston 12 with the cylindrical pin 4 and the diamond pin 5, pass through the four inner hole support fixtures 7 and install it on the positioning plate 3, use the pull rod 10 to pass through the fixture body with the piston 12, and then tighten the pull rod 10 with the M24 locking nut 11; Then clean and wipe the chuck of the variable elliptical lathe, and install the connecting plate 1 of the clamp body with the piston 12 installed on the chuck of the variable elliptical lathe through 6 M14 bolts. Finally, install the floating support plate 6 on the diesel engine piston 12 and tighten it with the tail stock of the machine tool. In this way, the outer circular line of the diesel engine piston can be processed. After the processing elements of the outer circular line of the piston 12 are completed, loosen and push out the tail stock of the machine tool, remove the floating support plate 6, screw out the 6 M14 bolts, remove the clamp body with the piston 12, place it in a safe place, then screw out the M24 nut 11, take out the pull rod 10, and remove the diesel engine piston 12 from the positioning plate 3. In this way, the processing of the outer circular line of the diesel engine piston is realized.

[0025] The technical solution has a simple structure, a wide range of applications, and is easy to operate. It ensures the size and shape and position tolerance requirements of the outer circular line of the diesel engine piston 12, as well as the stability of the processing and process when the diesel engine piston 12, the connecting plate 1, and the machine tool worktable are assembled together, ensures the processing size accuracy requirements of the outer circular line of the diesel engine piston, improves the reliability and stability of the tooling during use, facilitates pre-processing alignment during the process, improves production efficiency, and is easy to promote and use.

[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-restrictive 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 be 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 clamping device for the outer round line of diesel engine piston, characterized by: The invention comprises a connecting plate (1) fixedly connected to a machine tool chuck, a tapered sleeve (8) being fitted in a central hole of the connecting plate (1), and a positioning plate (3) being fitted and connected to the tapered hole of the tapered sleeve (8) being positioned and supported on the connecting plate (1), the positioning plate (3) being provided with a positioning locking device for being positioned and fixedly connected to a piston (12), a floating support plate (6) having a centering groove fitted with a tapered stop at a port position of the inner cavity of the piston (12) being provided at the right end thereof, and the tailstock of the machine tool being pressed against the floating support plate (6) to press and fix the floating support plate (6), the piston (12) and the positioning plate (3) to the connecting plate (1).

2. The auxiliary clamping device for the outer circular line of a diesel engine piston according to claim 1, characterized in that: The positioning and locking device comprises an inner hole support fixture (7) and a pull rod (10). The right disk surface of the positioning disk (3) is evenly distributed with a plurality of inner hole support fixtures (7) corresponding to the positions of the through holes on the left end surface of the piston (12). The inner hole support fixture (7) passes through the through holes at corresponding positions on the piston (12) and extends into the inner cavity of the piston (12). The inner hole support fixture (7) can be adjusted to expand or loosen the inner hole with the corresponding through hole. The pull rod (10) is a T-shaped structure formed by a left end pressure plate and a pull rod fixed to the middle of the pressure plate. The pressure plate of the pull rod (10) is located in the inner cavity of the piston (12) and contacts the conical wall at the left end of the inner cavity. The pull rod of the pull rod (10) passes through the central holes of the piston (12) and the positioning disk (3) and is adapted to be connected with a locking nut (11) located in the conical hole of the conical sleeve (8).

3. The auxiliary clamping device for the outer circular line of a diesel engine piston according to claim 2, characterized in that: The pressure plate of the pull rod (10) and the floating support plate (6) are distributed in a cross shape.

4. The auxiliary clamping device for the outer circular line of a diesel engine piston according to claim 1, characterized in that: The positioning plate (3) is a multi-stage stepped plate. A groove is formed on the right end surface of the positioning plate (3), and the left end of the piston (12) is located in the groove. A plurality of rhombus pins (5) and cylindrical pins (4) are provided on the right end annular surface of the positioning plate (3) and are adapted to the positioning holes on the left end surface of the piston (12) and are used to position the piston (12). The small diameter section at the left end of the positioning plate (3) is a tapered section and is adapted to the tapered hole of the tapered sleeve (8), and the step surface at the left end of the positioning plate (3) abuts against the right end surface of the tapered sleeve (8).

5. The auxiliary clamping device for the outer circular line of a diesel engine piston according to claim 4, characterized in that: The right end surface of the connecting disk (1) is provided with no less than two circular grooves, and the positioning block (2) arranged between the connecting disk (1) and the positioning disk (3) is located in the circular groove, and the positioning columns on the left and right end surfaces of the positioning block (2) are respectively adapted to the positioning holes on the connecting disk (1) and the positioning block (2).

6. The auxiliary clamping device for the outer circular line of a diesel engine piston according to any one of claims 1 to 5, characterized in that: The conical sleeve (8) is a T-shaped sleeve, and the small diameter section at the left end of the conical sleeve (8) is adapted to fit into the central hole of the connecting plate (1). The left end surface of the connecting plate (1) is provided with an avoidance groove (9), and the left ends of the conical sleeve (8) and the positioning locking device do not extend beyond the avoidance groove (9).

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