Positioning tool for PFI orifice plate machining

Abstract

The utility model belongs to positioning frock technical field relates to a kind of positioning frock for PFI injection orifice plate processing, including positioning pedestal, still including the positioning boss of being arranged on the positioning pedestal, movable clamp block and fixed clamp block, the fixed clamp block is fixed in the positioning boss one side, the movable clamp block is installed in the other side of the positioning boss in a manner that can be close to or away from the fixed clamp block, the movable clamp block and fixed clamp block are oppositely arranged, and the positioning boss is also equipped with suction port, and the suction port is located between the clamping end surface of the movable clamp block and the fixed clamp block. The positioning frock for PFI injection orifice plate processing provided by the utility model solves the clamping positioning problem existing in the prior art, improves the machining precision and product quality, and reduces production cost.

Description

Technical Field

[0001] This utility model relates to a positioning fixture for processing PFI nozzle plates, belonging to the field of positioning fixture technology. Background Technology

[0002] In the field of internal combustion engine technology, the fuel injection system plays a crucial role in engine performance. Among them, the PFI (Pump Injector Orifice Plate) is a key component of the fuel injection system, and its performance directly affects fuel atomization, combustion efficiency, and overall engine performance.

[0003] A PFI (Precision Fuel Injector) orifice plate is a thin metal plate with precision micropores, typically mounted at the end of the fuel injector nozzle. During engine operation, high-pressure fuel is atomized into extremely fine droplets as it passes through the micropores on the orifice plate, forming a uniform fuel spray. This uniform fuel spray promotes thorough mixing of fuel and air, creating favorable conditions for subsequent efficient combustion, ultimately improving combustion efficiency, reducing fuel consumption, and decreasing pollutant emissions.

[0004] In terms of structural dimensions, the outer diameter of a PFI nozzle plate is generally between 3mm and 15mm, with the thinnest part being only 0.15mm. On such a small nozzle plate, 4 to 8 micrometer-sized holes need to be precisely machined. The diameter of these holes is at the micrometer level, which requires extremely high machining precision.

[0005] Currently, the main processing method for PFI nozzle plates is stamping. However, stamping requires creating a new mold each time a new model of PFI nozzle plate is manufactured, and the mold creation cost is very expensive.

[0006] With the development of laser processing technology, femtosecond laser processing technology has been gradually applied to the manufacturing of PFI (Polymerized Injection Fluid) nozzle plates. Compared with stamping, femtosecond laser processing has significant advantages. It produces nozzles of higher quality, better meets the requirements of high-precision processing, and eliminates the need for molds, greatly improving production efficiency and reducing production costs.

[0007] However, when machining micro-holes in PFI orifice plates using femtosecond lasers, the orifice plates need to be clamped and fixed first. Due to the small size and thinness of PFI orifice plates, and their material properties making them highly susceptible to deformation during machining, clamping and positioning become difficult. Furthermore, PFI orifice plates come in various sizes; different engine models may require different sized orifice plates. Designing different clamping fixtures for different sized orifice plates would make tooling changes extremely cumbersome during actual production, increasing the complexity of production operations, wasting tooling manufacturing costs, and further impacting production efficiency and economic benefits.

[0008] Therefore, it is necessary to develop a tooling that can adapt to PFI nozzle plates of different sizes and effectively solve the clamping and positioning problem. Utility Model Content

[0009] The purpose of this utility model is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0010] The technical solution provided by this utility model is as follows: A positioning fixture for processing PFI nozzle plates includes a positioning base, and further includes a positioning boss, a movable clamping block and a fixed clamping block disposed on the positioning base. The fixed clamping block is fixed to one side of the positioning boss, and the movable clamping block is installed on the other side of the positioning boss in a manner that allows it to approach or move away from the fixed clamping block. The movable clamping block and the fixed clamping block are disposed opposite to each other, and the positioning boss is also provided with an air extraction port, which is located between the clamping end faces of the movable clamping block and the fixed clamping block.

[0011] The technical solution provided by this utility model exhibits the following significant advantages compared to existing technologies: In use, the positioning fixture is installed on the worktable of the laser equipment. The movable clamping block is opened, and the PFI nozzle plate to be drilled is placed on the positioning boss, ensuring it is positioned above the air extraction hole. The PFI nozzle plate is then clamped and fixed using the movable clamping block. During the laser drilling process, a vacuum device is simultaneously activated, which not only removes the laser dust generated during processing but also tightly adheres and fixes the nozzle plate to the surface of the positioning boss, ensuring it does not shift during processing. The positioning fixture for PFI nozzle plate processing provided by this utility model solves the clamping and positioning problems existing in the prior art, improves processing accuracy and product quality, and reduces production costs.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] Furthermore, the clamping surface of the fixed clamping block is a V-shaped clamping surface, and the clamping surface of the movable clamping block is a straight clamping surface.

[0014] The beneficial effects of adopting the above-mentioned further solution are as follows: First, the fixed clamping block of the V-shaped clamping surface and the movable clamping block of the straight clamping surface can adapt to different sizes and shapes of the nozzle plate; second, the V-shaped clamping surface has self-centering characteristics, and can automatically find the center position when the nozzle plate is placed, regardless of its size; the straight clamping surface and the V-shaped surface work together to form a three-point positioning, which can ensure that the nozzle plate will not shift or deform during the processing, thereby ensuring processing accuracy and product quality, and effectively improving the pass rate of PFI nozzle plate processing.

[0015] Furthermore, the positioning boss is a truncated cone.

[0016] Furthermore, the positioning base and the positioning boss are an integral structure.

[0017] The beneficial effect of adopting the above-mentioned further solution is that the integrated structure eliminates the connection gap between the positioning base and the positioning boss, avoiding the problem of inaccurate positioning caused by loose connection.

[0018] Furthermore, the positioning base is also provided with a first mounting groove and a second mounting groove. The shape of the first mounting groove is adapted to the shape of the fixed clamping block, and the fixed clamping block is installed in the first mounting groove. The shape of the second mounting groove is adapted to the shape of the movable clamping block. One end of the movable clamping block near the clamping surface is pinned to the second mounting groove, and the other end of the movable clamping block is connected to the positioning base by a spring.

[0019] The beneficial effects of adopting the above-mentioned further solution are that the first and second mounting slots provide installation positions for the fixed clamping block and the movable clamping block, ensuring the accuracy and stability of the clamping block installation. The movable clamping block is pinned at one end and spring-loaded at the other, providing a certain degree of elastic cushioning when clamping the nozzle plate. This provides sufficient clamping force while preventing damage to the nozzle plate due to excessive clamping force. Simultaneously, the connection method facilitates the opening and closing of the movable clamping block, improving the efficiency of clamping and disassembling the nozzle plate and reducing the labor intensity of the operators.

[0020] Furthermore, it also includes a robotic arm adapter gripping end body, which is installed below the positioning base to cooperate with the robotic arm in operation.

[0021] The beneficial effect of adopting the above-mentioned further solution is that, through the adaptation of the robotic arm to the gripping end body, the robotic arm can quickly and accurately move the positioning fixture onto the equipment, realizing the automated handling and installation of the positioning fixture and improving production efficiency. At the same time, it reduces errors and safety hazards that may be caused by manual operation.

[0022] Furthermore, the bottom of the robotic arm adapter gripping end body is provided with multiple positioning grooves, which are used to engage with the spherical protrusions on the device for positioning.

[0023] The beneficial effect of adopting the above-mentioned further solution is that the positioning groove cooperates with the spherical protrusion on the equipment, which can provide precise positioning for the installation of the positioning fixture on the equipment and ensure the consistency of the positioning fixture's position each time it is installed. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of the positioning tooling of this utility model; Figure 2 This is the front view of the positioning fixture of this utility model; Figure 3 The positioning tooling of this utility model Figure 3 AA-axis isometric sectional view; Figure 4 This is a schematic diagram of the positioning groove at the bottom of the positioning fixture of this utility model; Figure 5 This is a three-dimensional structural diagram of the positioning base of the positioning fixture of this utility model. Figure 6 This is a schematic diagram of the positioning fixture for clamping and positioning the PFI nozzle plate of this utility model. In the figure, 1. Positioning base; 11. First mounting groove; 12. Second mounting groove; 2. Positioning boss; 3. Movable clamping block; 31. Straight clamping surface; 32. Pin; 4. Fixed clamping block; 41. V-shaped clamping surface; 5. Air extraction port; 6. Spring; 7. Robotic arm adapter clamping end body; 8. Positioning groove; 9. PFI nozzle plate. Detailed Implementation

[0026] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the objects described and do not imply any priority in order or any specific technical meaning. Furthermore, the concepts of "connection" and "linkage" mentioned in this application, unless otherwise specified, are considered to include both direct connection (linkage) and indirect connection (linkage).

[0027] When interpreting the description of this application, it should be clarified that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating directions or positional relationships, are based on the perspective and layout shown in the accompanying drawings. They are intended to facilitate explanation and simplify the description process, and are not absolute limitations on the actual location, construction method, or operating mode of the described device or element. Therefore, these terms should not be construed as restrictive interpretations of the content of this application.

[0028] The principles and features of this utility model are described below with reference to examples. The examples are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0029] like Figures 1-6 As shown, the technical solution provided by this utility model is as follows: A positioning fixture for processing PFI nozzle plates includes a positioning base 1, and further includes a positioning boss 2, a movable clamping block 3, and a fixed clamping block 4 disposed on the positioning base 1. The movable clamping block 3 and the fixed clamping block 4 are disposed opposite to each other on the positioning platform. The fixed clamping block 4 is fixed to one side of the positioning boss 2. The movable clamping block 3 is installed on the other side of the positioning boss 2 in a manner that allows it to approach or move away from the fixed clamping block 4. The positioning boss 2 is also provided with an air extraction port 5, which is located between the clamping end faces of the movable clamping block 3 and the fixed clamping block 4.

[0030] The clamping surface of the fixed clamping block 4 is V-shaped, while the clamping surface of the movable clamping block 3 is straight. The V-shaped clamping surface 41 of the fixed clamping block 4 and the straight clamping surface 31 of the movable clamping block 3 cooperate to achieve three-point positioning of the nozzle plate. The combination of the fixed clamping block 4 with the V-shaped clamping surface 41 and the movable clamping block 3 with the straight clamping surface 31 can adapt to nozzle plates of different sizes and shapes; the V-shaped clamping surface 41 has self-centering characteristics, and can automatically find the center position when the nozzle plate is placed, regardless of its size. The straight clamping surface 31 and the V-shaped clamping surface 41 work together to form a stable three-point positioning, ensuring that the nozzle plate will not shift or deform during processing.

[0031] The positioning boss 2 is in the shape of a frustum cone. In this embodiment, the positioning base 1 and the positioning boss 2 are an integral structure, which eliminates the connection gap between the positioning base 1 and the positioning boss 2 and avoids the problem of inaccurate positioning caused by loose connection.

[0032] The positioning base 1 is provided with a first mounting groove 11 and a second mounting groove 12. The shape of the first mounting groove 11 matches the shape of the fixed clamping block 4, and the fixed clamping block 4 is installed in the first mounting groove 11. The shape of the second mounting groove 12 matches the shape of the movable clamping block 3. One end of the movable clamping block 3 near the clamping surface is pinned to the second mounting groove 12 by a pin 32, and the other end is connected to the positioning base 1 by a spring 6.

[0033] The movable clamping block 3 is pinned at one end and spring 6 connected at the other end. When the movable clamping block 3 is pressed down, the spring 6 is compressed, and the movable clamping block 3 rotates around the pin 32, opening the clamping surface. At this time, the PFI nozzle plate 9 to be drilled can be placed on the positioning boss 2. When the movable clamping block 3 is released, under the action of the elastic restoring force, the movable clamping block 3 will rotate in the opposite direction around the pin 32 to reset, thereby clamping the PFI nozzle plate 9 to be drilled.

[0034] The positioning fixture also includes a robotic arm adapter gripping end body 7 installed below the positioning base 1. Through the robotic arm adapter gripping end body 7, the robotic arm can quickly and accurately move the positioning fixture onto the equipment, realizing the automated handling and installation of the positioning fixture.

[0035] The bottom of the robotic arm adapter gripping end body 7 is also provided with multiple positioning grooves 8, which are used to engage with spherical protrusions on the equipment for positioning. The engagement of the positioning grooves 8 with the spherical protrusions on the equipment can provide precise positioning for the installation of the positioning fixture on the equipment, ensuring the consistency of the positioning fixture's position each time it is installed.

[0036] The working method of the positioning fixture for PFI nozzle plate processing of this utility model is as follows: S1. First, the positioning fixture holding the nozzle plate is moved to the laser equipment by the robotic arm gripping the robotic arm adapter clamping end body 7; the positioning groove 8 at the bottom of the robotic arm adapter clamping end body 7 cooperates with the spherical protrusion on the laser equipment to realize the positioning and installation of the positioning fixture on the equipment. S2. Press the movable clamping block 3 to place the PFI nozzle plate 9 to be processed on the positioning boss 2, and make the edge of the nozzle plate contact the V-shaped clamping surface 41 of the fixed clamping block 4; release the movable clamping block 3, and under the action of the spring 6, the straight clamping surface 31 of the movable clamping block 3 automatically presses against the edge of the nozzle plate, and works in conjunction with the V-shaped clamping surface 41 of the fixed clamping block 4 to form three-point positioning and clamp the nozzle plate. S4. The laser equipment performs a preset processing operation on the positioned nozzle plate and starts the air extraction equipment at the same time. This not only removes the laser dust generated during processing, but also tightly adsorbs and fixes the nozzle plate on the surface of the positioning boss 2, ensuring that it does not shift during processing. S5. After processing is completed, stop the air extraction, operate the movable clamping block 3 to move it away from the nozzle plate, and remove the processed nozzle plate.

[0037] The positioning fixture for processing PFI nozzle plate 9 provided by this utility model solves the clamping and positioning problem existing in the prior art, improves processing accuracy and product quality, and reduces production costs.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positioning fixture for processing PFI nozzle plates, comprising a positioning base (1), characterized in that, It also includes a positioning boss (2), a movable clamping block (3) and a fixed clamping block (4) disposed on the positioning base (1). The fixed clamping block (4) is fixed on one side of the positioning boss (2), and the movable clamping block (3) is installed on the other side of the positioning boss (2) in a manner that allows it to be close to or away from the fixed clamping block (4). The movable clamping block (3) and the fixed clamping block (4) are disposed opposite to each other. The positioning boss (2) is also provided with an air extraction port (5), and the air extraction port (5) is located between the clamping end faces of the movable clamping block (3) and the fixed clamping block (4).

2. The positioning fixture for processing PFI nozzle plates according to claim 1, characterized in that, The clamping surface of the fixed clamping block (4) is a V-shaped clamping surface (41), and the clamping surface of the movable clamping block (3) is a straight clamping surface (31).

3. The positioning fixture for processing PFI nozzle plates according to claim 2, characterized in that, The positioning boss (2) is a truncated cone.

4. The positioning fixture for processing PFI nozzle plates according to claim 1, characterized in that, The positioning base (1) and the positioning boss (2) are an integral structure.

5. The positioning fixture for processing PFI nozzle plates according to any one of claims 1-4, characterized in that, The positioning base (1) is also provided with a first mounting groove (11) and a second mounting groove (12). The shape of the first mounting groove (11) is adapted to the shape of the fixed clamping block (4). The fixed clamping block (4) is installed in the first mounting groove (11). The shape of the second mounting groove (12) is adapted to the shape of the movable clamping block (3). One end of the movable clamping block (3) near the clamping surface is pinned to the second mounting groove (12). The other end of the movable clamping block (3) is connected to the positioning base (1) by a spring (6).

6. The positioning fixture for processing PFI nozzle plates according to claim 5, characterized in that, It also includes a robotic arm adapter gripper (7), which is installed below the positioning base (1) and is used to work with the robotic arm.

7. The positioning fixture for processing PFI nozzle plates according to claim 6, characterized in that, The bottom of the robotic arm adapter gripping end body (7) is also provided with multiple positioning grooves (8), which are used to cooperate with the spherical protrusions on the equipment for positioning.

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