Device for processing inclined oil hole on top of diesel engine piston

Abstract

Provided is a diesel engine piston top inclined oil hole processing device, belonging to the technical field of mechanical processing. The device comprises a base, a tool holder cross beam assembly, a pressing assembly and a positioning assembly; the base is fixedly installed on the workbench of a radial drill through a fixing assembly; the positioning assembly comprises a support pin and a roller assembly arranged on the base and used for supporting and positioning the diesel engine piston top; the pressing assembly is used for pressing the diesel engine piston top positioned on the base through the support pin and the roller assembly from the upper end edge; one end of the tool holder cross beam assembly is hingedly connected to the base, and the other end is fixedly pressed through a shoulder nut; a drill sleeve is installed on the tool holder cross beam assembly. The diesel engine piston top center cavity arc surface is compensated to an effective processing reference surface through the drill sleeve, effectively solving the problems of large clamping difficulty, alignment trouble, low processing efficiency and difficult quality guarantee during diesel engine piston top inclined oil hole processing, and realizing rapid clamping, automatic centering and indexing processing.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing technology, specifically relating to a processing device for an inclined oil hole on the piston top of a diesel engine. Background Technology

[0002] The piston is one of the key components of a diesel engine. Machining the inclined oil hole on the piston crown (primarily referring to the inclined oil hole located in the central cavity of the piston crown) is one of the most difficult and challenging aspects of the entire piston crown machining process. The dimensional requirements and geometric tolerances for this inclined oil hole are very high, making it difficult to guarantee the hole's size and position during machining.

[0003] Currently, when machining the inclined oil hole on a radial drilling machine, because the piston top is a rotating part, its top end face cannot be directly and stably connected and clamped to the radial drilling machine's worktable. Therefore, a special tooling design is required. The traditional method is to design a complex special device to connect the radial drilling machine's worktable and the top end face of the piston top. A tool holder measuring assembly is designed in the middle of the special device to press a special pressure plate with a drill sleeve against the arc surface of the piston top's central cavity and fix it to the machine tool's worktable. During clamping, the special device must first be connected and clamped to the machine tool's worktable with T-bolts, then the top end face of the piston top is assembled against the upper plane of the special device, and finally clamped with the pressure plate. This clamping method is difficult, time-consuming, and very troublesome to align. The clamping process is prone to part deformation and dimensional deviations, resulting in low machining efficiency and unstable machining quality, which seriously restricts the normal production of diesel engine piston tops.

[0004] Therefore, there is an urgent need for a special device for machining inclined oil holes on diesel engine pistons that can simplify the clamping process, improve positioning accuracy and machining efficiency. Utility Model Content

[0005] The technical problem solved by this utility model is to overcome the shortcomings of the prior art and provide a processing device for the inclined oil hole of the piston top of a diesel engine, so as to solve the problems of high clamping difficulty, troublesome alignment, low processing efficiency and difficulty in guaranteeing quality in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A machining device for the inclined oil hole of a diesel engine piston includes a base, a tool holder crossbeam assembly, a clamping assembly, and a positioning assembly; The base is fixedly mounted on the worktable of the radial drilling machine by a fixing component; The positioning assembly includes a support pin and a roller assembly mounted on a base for supporting and positioning the top of the diesel engine piston. The clamping assembly is used to clamp the diesel engine piston top, which is positioned on the base by a support pin and roller assembly, from the upper edge. One end of the tool holder crossbeam assembly is hinged to the base, and the other end is pressed and fixed by a shoulder nut; a drill sleeve is installed on the tool holder crossbeam assembly.

[0007] As a further limitation of the above scheme, the fixing components of the base mounted on the worktable of the radial drilling machine include T-screws and clamping nuts.

[0008] To further define the above solution, the base is also provided with a positioning key, which is fixed to the base by fixing bolts and is used to cooperate with the T-slot of the radial drilling machine's worktable for positioning.

[0009] Further defining the above solution, the roller assembly includes a roller and a roller column, the roller being mounted on the roller column by a clamping screw, and the roller column being mounted on a base.

[0010] Further specifying the above scheme, the number of support pins is four, and the number of roller assemblies is two.

[0011] Further defining the above solution, the clamping assembly includes a support column, a pressure plate, a lock nut, and a double-ended bolt for clamping the piston top of the diesel engine. The lower ends of the support column and the double-ended bolt are screwed into the base. The upper end of the support column is used to connect to the support pressure plate. The upper end of the double-ended bolt passes through the U-shaped hole on the pressure plate and is locked by the lock nut.

[0012] Further defining the above solution, the base is provided with fixed seats on both sides, one end of the tool holder crossbeam assembly is hinged to the fixed seat on one side through a hinge shaft and a sleeve; the other fixed seat is connected to a clamping bolt through a cylindrical pin, and the shoulder nut engages with the clamping bolt to press the other end of the tool holder crossbeam assembly.

[0013] Advantages of this utility model compared to the prior art: 1. This solution features simple clamping and accurate positioning: Through the cooperation of support pins, roller assemblies, and clamping assemblies, the piston top is quickly and stably clamped and accurately positioned; the drill bushing on the tool holder crossbeam assembly can automatically center, greatly reducing the alignment time before machining and lowering the difficulty of operation. 2. This solution improves processing efficiency: After one clamping, all inclined oil holes can be processed sequentially. Simply loosen the piston top clamping nut and rotate the angle to change position, which significantly shortens auxiliary time and improves production efficiency. 3. This solution guarantees processing quality: The device has a stable and reliable structure, high positioning accuracy, effectively reduces clamping deformation and processing errors, and ensures that the dimensional and positional accuracy of the inclined oil hole meets the drawing requirements, resulting in stable processing quality; 4. This solution has good versatility and is easy to promote: The device has a reasonable structural design and is easy to manufacture. It is not only applicable to the piston top of the diesel engine, but can also be extended to the processing of inclined holes in other similar rotating parts, and has high application value. Attached Figure Description

[0014] Figure 1 This is a front view of the structure of this utility model; Figure 2 This is a rear view of the structure of this utility model; Figure 3 This is a top view of the structure of this utility model; Figure 4 This utility model Figure 3 AA section view in the middle; Figure 5 This utility model Figure 3 BB section view in the middle; Figure 6 This utility model Figure 3 CC section view in the middle; Figure 7 This utility model Figure 3 DD section view in the middle; Figure 8 This utility model Figure 3 EE section view; Figure 9 This utility model Figure 3 FF section view; Figure 10 This is a top view of the piston top of a diesel engine. Figure 11 for Figure 10 GG cross-sectional view of the piston top of a diesel engine; Figure 12 The main view of the structure for fixing the diesel engine piston to the processing device of this utility model; Figure 13 Rear view of the structure for fixing the diesel engine piston to the processing device of this utility model; Figure 14 A top view of the structure for fixing the diesel engine piston to the processing device of this utility model; Figure 15 This utility model Figure 14 Sectional view of B'-B' in the middle; Figure 16 This is a three-dimensional structural diagram of the processing device for fixing the diesel engine piston top onto the present invention.

[0015] In the diagram: 1. Base; 2. T-screw; 3. Compression nut; 4. Support column; 5. Pressure plate; 6. Locking nut; 7. Double-ended bolt; 8. Tool holder crossbeam assembly; 9. Hinge shaft; 10. Sleeve; 11. Drill bushing; 12. Support pin; 13. Locating key; 14. Fixing bolt; 15. Roller; 16. Roller; 17. Compression screw; 18. Compression bolt; 19. Shoulder nut; 20. Cylindrical pin; 21. Diesel engine piston top; 22. Worktable. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0017] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0019] Please see Figure 1-16 The embodiments of this utility model are described in detail below.

[0020] Example: A machining device for the inclined oil hole of a diesel engine piston, including a base 1, a tool holder crossbeam assembly 8, a clamping assembly and a positioning assembly.

[0021] See Figure 1-3 As shown, the base 1 is typically made of cast iron, providing good stability. The base 1 is fixedly mounted on the worktable 22 with a 90° backrest of the radial drilling machine by four M20 T-screws 2 and clamping nuts 3.

[0022] To ensure accurate installation, a positioning key 13 is also provided on the base 1. (See reference...) Figure 7 As shown, the positioning key 13 is fixed to the base 1 by the fixing bolt 14, and is used to cooperate with the T-slot of the radial drilling machine worktable 22 for positioning to ensure installation accuracy.

[0023] The positioning assembly is used to support and position the diesel engine piston top 21. See also... Figure 6 , Figure 8 As shown, it includes four support pins 12 and two sets of roller assemblies, which together form a stable "one-face, two-pin" positioning support structure. The support pins 12 are fixed to the base 1 and support the end face of the piston top 21. Each roller assembly includes a roller 15 and a roller 16. The roller 15 is mounted on the roller 16 by an M16 clamping screw 17, and the roller 16 is mounted on the base 1. The roller 15 supports the outer circle of the diesel engine piston top 21 and allows it to rotate easily.

[0024] The clamping assembly is used to clamp the workpiece. (See also...) Figure 1 , Figure 2 As shown, it includes a support column 4, a pressure plate 5, a locking nut 6, and a double-ended bolt 7. The lower ends of the support column 4 and the double-ended bolt 7 are screwed into the base 1. The upper end of the support column 4 is used to connect to the support pressure plate 5. The upper end of the double-ended bolt 7 passes through the U-shaped hole on the pressure plate 5 and is locked by the locking nut 6.

[0025] The tool holder crossbeam assembly 8 is the core guiding component. Fixed seats are provided on both sides of the base 1, see reference. Figure 4 As shown, one end of the tool holder crossbeam assembly 8 is hinged to a fixed base on one side via a hinge shaft 9 and a sleeve 10, allowing it to have a certain range of motion. (See reference...) Figure 9 As shown, a clamping bolt 18 is connected to the other fixed seat via a cylindrical pin 20. A shoulder nut 19 engages with the clamping bolt 18 to clamp the other end of the tool holder crossbeam assembly 8. (See reference...) Figure 5 As shown, a drill bushing 11 is installed on the tool holder crossbeam assembly 8, and the inner hole of the drill bushing 11 provides precise guidance for the drill bit. During machining, the tool holder crossbeam assembly 8 is pressed tightly by tightening the shoulder nut 19, so that the drill bushing 11 on it fits tightly against the arc surface of the central cavity of the diesel engine piston top 21.

[0026] The method of using this device (i.e., the processing method) is as follows: (See attached document) Figure 10-16 As shown, First, clean the radial drilling machine's worktable 22. Use fixing bolts 14 to assemble the positioning key 13 onto the base 1. Use four M20 T-screws 2 to install the base 1 onto the 90° inclined drilling machine's worktable 22, and tighten it with four M20 clamping nuts 3.

[0027] Screw one end of the support column 4 and the M20 double-ended bolt 7 into the base 1. Mount the roller 15 onto the roller 16, tighten it with the M16 clamping screw 17, and then install it onto the base 1. Install the four support pins 12 onto the base 1.

[0028] Install the drill bushing 11 onto the tool holder crossbeam assembly 8. Hinge the tool holder crossbeam assembly 8 onto the base 1 by passing the hinge pin 9 through the sleeve 10. Then pass the cylindrical pin 20 through the tool holder crossbeam assembly 8 and initially secure it with the M12 clamping bolt 18.

[0029] Place the diesel engine piston top 21 on the base 1 with its end face against the four support pins 12 and two rollers 15. Secure the diesel engine piston top 21 with the pressure plate 5 and the lock nut 6.

[0030] Use shoulder nut 19 to press the tool holder crossbeam assembly 8.

[0031] At this point, you can begin machining the angled oil holes on the diesel engine piston top 21. After machining each angled oil hole, loosen the lock nut 6, rotate the diesel engine piston top 21 by an angle (such as 90° or the required angle), and then retighten the lock nut 6 to machine the next angled oil hole. Repeat this process until all angled oil holes have been machined.

[0032] After processing, loosen and unscrew the locking nut 6, remove the pressure plate 5, and remove the diesel engine piston top 21. Loosen the four M20 clamping nuts 3 and remove the base 1 from the machine tool worktable 22.

[0033] In this invention, the base is securely fixed to the radial drilling machine's worktable by T-screws, clamping nuts, and positioning keys, providing a stable foundation. The diesel engine piston top rests on four support pins and two roller assemblies via its top end face, achieving initial support and radial positioning (the rollers allow the piston top to rotate easily to adjust the machining position). The piston top is reliably pressed onto the base by pressure plates, double-ended bolts, and lock nuts, preventing movement during machining. The tool holder crossbeam assembly is mounted on the base via a hinge shaft, allowing for movement; the drill bushing mounted on it provides precise guidance for the drill bit. The tool holder crossbeam assembly is clamped by a shoulder nut, causing the drill bushing to fit tightly against the arc surface of the piston top's central cavity. This arc surface is compensated to become a reliable drilling guide plane, achieving automatic positioning of the inclined oil hole center and eliminating tedious alignment steps. After machining one hole, simply loosen the lock nut clamping the piston top, rotate the piston top to a predetermined angle, and clamp it again to machine the next inclined oil hole, making it highly efficient.

[0034] This device, through its ingenious mechanical structure, uses a drill bushing to compensate for the arc surface of the piston top center cavity, making it an effective machining reference surface. This enables rapid clamping, automatic centering, and indexing machining, effectively solving the problems existing in the background technology.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A machining device for the inclined oil hole of a diesel engine piston, characterized in that: Includes a base (1), a tool holder crossbeam assembly (8), a clamping assembly, and a positioning assembly; The base (1) is fixedly installed on the worktable (22) of the radial drilling machine by a fixing component; The positioning assembly includes a support pin (12) and a roller assembly disposed on the base (1) for supporting and positioning the diesel engine piston top (21). The clamping assembly is used to clamp the diesel engine piston top (21) positioned on the base (1) by the support pin (12) and the roller assembly from the upper edge; One end of the tool holder crossbeam assembly (8) is hinged to the base (1), and the other end is pressed and fixed by a shoulder nut (19); a drill sleeve (11) is installed on the tool holder crossbeam assembly (8).

2. The machining apparatus for the inclined oil hole of the diesel engine piston as described in claim 1, characterized in that: The mounting components of the base (1) on the worktable (22) of the radial drilling machine include T-screws (2) and clamping nuts (3).

3. The machining apparatus for the inclined oil hole of the diesel engine piston as described in claim 1, characterized in that: The base (1) is also provided with a positioning key (13), which is fixed to the base (1) by a fixing bolt (14) and is used to cooperate with the T-slot of the radial drilling machine worktable (22) for positioning.

4. The machining apparatus for the inclined oil hole of the diesel engine piston as described in claim 1, characterized in that: The roller assembly includes a roller (15) and a roller (16), the roller (15) being mounted on the roller (16) by a clamping screw (17), and the roller (16) being mounted on a base (1).

5. The machining apparatus for the inclined oil hole of the diesel engine piston as described in claim 1, characterized in that: The clamping assembly includes a support column (4), a pressure plate (5), a lock nut (6), and a double-ended bolt (7) for clamping the piston top (21) of the diesel engine. The lower ends of the support column (4) and the double-ended bolt (7) are screwed into the base (1). The upper end of the support column (4) is used to connect to the support pressure plate (5). The upper end of the double-ended bolt (7) passes through the U-shaped hole on the pressure plate (5) and is locked by the lock nut (6).

6. The machining apparatus for the inclined oil hole of the diesel engine piston as described in claim 1, characterized in that: The base (1) has fixed seats on both sides. One end of the tool holder crossbeam assembly (8) is hinged to the fixed seat on one side through a hinge shaft (9) and a sleeve (10). On the other side of the fixed seat, a clamping bolt (18) is connected through a cylindrical pin (20). The shoulder nut (19) and the clamping bolt (18) are screwed together to clamp the other end of the tool holder crossbeam assembly (8).

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