Positioning tool for machining superfine deep and long hole
By designing a positioning fixture for machining ultra-fine, deep, and long holes, the problem of frequently adjusting the drill bit angle in the machining of jetting devices was solved, achieving high-precision and high-efficiency machining results and improving the quality and production efficiency of jetting devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN NANHAI ZHONGNAN MACHINERY
- Filing Date
- 2025-04-16
- Publication Date
- 2026-04-17
AI Technical Summary
Existing technologies for machining jetting devices with ultra-fine, deep, and long holes require frequent adjustments to the drill bit tilt angle, resulting in low production efficiency, insufficient precision, and impacting product quality consistency while increasing costs.
A positioning fixture for machining ultra-fine deep holes is designed, comprising a base plate, a clamping assembly, and a positioning groove. The standardized positioning groove and clamping assembly fix the jetting device at a preset angle, reducing errors and ensuring machining accuracy and efficiency.
It improves the processing accuracy and performance consistency of the jetting devices, reduces product scrap rate and production costs, greatly shortens the processing cycle, and improves production efficiency.
Smart Images
Figure CN224129158U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of machining technology, and in particular to a positioning fixture for machining ultra-fine deep holes. Background Technology
[0002] In modern industrial manufacturing, the demand for high-precision component processing is increasing. Taking injection devices as an example, they have crucial applications in many industries, such as aerospace, automotive engine fuel injection systems, and high-end medical devices.
[0003] In the manufacturing process of jetting devices, a key and challenging machining task is drilling ultra-fine and deep blind holes on the front face of its head. Adding to the complexity, the axes of these blind holes are not parallel to the axis of the jetting device itself, but rather form a specific angle. This special hole design aims to meet the precise requirements of the jetting device in actual operation regarding fluid jetting angle, flow control, and jetting effect.
[0004] Currently, the conventional method for machining such jetting devices involves frequently adjusting the drill bit's tilt angle during processing to adapt to different jetting device machining procedures. However, this traditional approach has several insurmountable drawbacks. First, frequent switching and adjustment of the drill bit's tilt angle significantly reduces production efficiency. Each adjustment requires substantial time, including downtime, recalibration, and equipment debugging, which greatly extends the entire processing cycle. Second, frequent manual adjustments suffer from severe precision deficiencies. Due to human factors and the mechanical errors of the equipment itself, it is difficult to guarantee that each adjustment will achieve extremely high precision standards, directly impacting the accuracy of blind hole machining. The instability in blind hole machining accuracy further affects the performance consistency of the jetting devices, and in extreme cases, may lead to product scrap due to failure to meet stringent quality standards, resulting in resource waste and increased production costs.
[0005] Therefore, there is an urgent need to design a positioning fixture for clamping the jetting device in the machining of ultra-fine deep holes, so as to improve the overall quality and efficiency of the jetting device machining. Utility Model Content
[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a positioning fixture for machining ultra-fine deep holes, so as to improve the overall quality and efficiency of jet device machining.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A positioning fixture for machining ultra-fine deep holes, used for clamping and positioning a jetting device, includes a base plate, a clamping assembly, and at least one positioning groove on the top surface of the base plate. The positioning groove extends through the entire device in the front-to-back direction. The jetting device is horizontally placed in the positioning groove. A threaded hole is provided on the side of the positioning groove. The clamping assembly includes a pressure plate, a screw, and a counterweight. One end of the pressure plate presses down on the body of the jetting device, and the other end presses down on the counterweight. The screw is vertically positioned in the middle of the pressure plate. The threaded end of the screw engages with the threaded hole, and the head of the screw provides downward pressure to the pressure plate. The head of the jetting device is aligned with the front end face of the pressure plate.
[0009] As a further improvement to the above technical solution, the positioning groove includes a straight groove and supporting inclined surfaces disposed on both sides of the straight groove.
[0010] As a further improvement to the above technical solution, two positioning grooves are provided with different inclination angles, and each positioning groove represents a processing station.
[0011] As a further improvement to the above technical solution, one of the positioning grooves has an inclination angle of 88° and the other positioning groove has an inclination angle of 50°.
[0012] As a further improvement to the above technical solution, a U-shaped groove is provided on the pressure plate for screws to be embedded in the central axis of the pressure plate.
[0013] As a further improvement to the above technical solution, the clamping assembly is provided in two sets.
[0014] As a further improvement to the above technical solution, the base plate is provided with multiple vertically extending countersunk mounting holes.
[0015] The beneficial effects of this utility model are as follows: The positioning fixture provided by this utility model, through standardized positioning grooves and clamping components, can stably and accurately fix the jetting device at a preset angle, reducing errors caused by frequent adjustments and ensuring the stability of blind hole machining accuracy. Improved machining accuracy helps to enhance the performance consistency of the jetting device, reduce product scrap rate, and minimize resource waste and production costs; it avoids the time wasted by frequent adjustments in traditional methods, greatly shortens the entire processing cycle, and significantly improves production efficiency. Attached Figure Description
[0016] Figure 1 A 3D view of the first machining station for mounting the spraying device onto the positioning fixture.
[0017] Figure 2 The front view of the first machining station where the spraying device is clamped into the positioning fixture.
[0018] Figure 3 for Figure 2 Sectional view of AA.
[0019] Figure 4 A 3D view of the spraying device being clamped into the positioning fixture at the second machining station.
[0020] Figure 5 The front view of the second machining station where the spraying device is clamped into the positioning fixture.
[0021] Figure 6 for Figure 5 A cross-sectional view of BB.
[0022] Figure 7 This is a three-dimensional view of the base plate.
[0023] Figure 8 This is a top view of the base plate.
[0024] Explanation of main component symbols: 1-base plate, 11-threaded hole, 12-countersunk mounting hole, 2-clamping assembly, 21-pressure plate, 211-U-groove, 22-screw, 23-balance block, 3-positioning groove, 31-straight groove, 32-supporting slope, 4-spraying device, 41-body, 42-head, 43-first ultra-fine deep hole, 44-second ultra-fine deep hole, 45-circumferential positioning section. Detailed Implementation
[0025] This utility model provides a positioning fixture for machining ultra-fine, deep, and long holes. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit the scope of protection of this utility model.
[0026] Please see Figures 1 to 8 This utility model provides a positioning fixture for machining ultra-fine deep holes, used to clamp and position a jetting device 4. The jetting device 4 includes a cylindrical body 41 and a round head 42. The diameter of the head 42 is larger than the diameter of the body 41. The body 41 and the head 42 of the jetting device 4 are pre-set with circumferential positioning cut surfaces 45.
[0027] The positioning fixture includes a base plate 1, a clamping assembly 2, and at least one positioning groove 3 opened on the top surface of the base plate 1. The positioning groove 3 extends through the front and rear direction. The spraying device 4 is horizontally placed in the positioning groove 3. A threaded hole 11 is opened on the side of the positioning groove 3. The clamping assembly 2 includes a pressure plate 21, a screw 22, and a balance block 23. One end of the pressure plate 21 presses down on the body 41 of the spraying device 4, and the other end presses down on the balance block 23. The screw 22 is vertically arranged in the middle of the pressure plate 21. The threaded end of the screw 22 is connected to the threaded hole 11. The head 42 of the screw 22 provides downward pressure to the pressure plate 21. The head 42 of the spraying device 4 is aligned with the front end face of the pressure plate 21.
[0028] When using this positioning fixture for machining ultra-fine deep holes, the spraying device 4 is first placed horizontally in the positioning groove 3 extending through the front and rear directions on the top surface of the base plate 1. Since the positioning groove 3 has a preset specific inclination angle, the spraying device 4 is placed at an angle that meets the machining requirements. Since the body 41 and head 42 of the spraying device 4 have preset circumferential positioning surfaces 45, the spraying device 4 is first rotated so that the circumferential positioning surfaces 45 of the body 41 and head 42 of the spraying device 4 face upwards. Then, the levelness of the circumferential positioning surfaces 45 is adjusted by a level, thereby ensuring the accurate position of the spraying device 4 at the circumferential machining point. Subsequently, the head 42 of the spraying device 4 is aligned with the front end face of the pressure plate 21 to achieve front and rear positioning. Next, the clamping assembly 2 is used to fix the jetting device 4. Specifically, one end of the pressure plate 21 presses down on the body 41 of the jetting device 4, and the other end presses down on the balance block 23. The screw 22 located in the middle of the pressure plate 21 is connected to the corresponding threaded hole 11 to ensure that the pressure plate 21 is horizontal and stable, so as to prevent the pressure plate 21 from bending on one side under force. As the screw 22 is tightened, the head 42 of the screw 22 applies downward pressure to the pressure plate 21. Under the pressure, the pressure plate 21 stably presses the jetting device 4 into the positioning groove 3. At this time, the drill bit face is facing the front end face of the base plate 1. Since the jetting device 4 has been clamped and fixed at the correct angle by the positioning fixture, there is no need to adjust the tilt angle of the drill bit. The high-speed rotating drill bit moves forward, and the ultra-fine deep and long blind hole can be processed on the front end face of the head 42 of the jetting device 4 according to the preset procedure.
[0029] Compared to traditional methods that require frequent adjustments to the drill bit tilt angle during processing, each adjustment involving machine downtime, calibration, and equipment debugging, resulting in significant time consumption, the positioning fixture provided by this invention, through standardized positioning grooves 3 and clamping components 2, can stably and accurately fix the jetting device 4 at a preset angle. This reduces errors caused by frequent adjustments and ensures the stability of blind hole processing accuracy. Improved processing accuracy helps enhance the performance consistency of the jetting device 4, reduces product scrap rates, minimizes resource waste and production costs, avoids the time wasted by frequent adjustments in traditional methods, greatly shortens the entire processing cycle, and significantly improves production efficiency.
[0030] Specifically, the positioning groove 3 includes a straight groove portion 31 and supporting inclined surfaces 32 disposed on both sides of the straight groove portion 31. The supporting inclined surfaces 32 make it easier for the operator to place the spraying device 4 into the positioning groove 3 during the clamping process. The supporting inclined surfaces 32 continuously provide a stable supporting force to the spraying device 4. As long as it is placed on the supporting inclined surfaces 32, it can sink stably to the position of the straight groove portion 31 with the help of the inclined surfaces. The straight groove portion 31 avoids the circumference of the spraying device 4, which greatly reduces the clamping difficulty, improves the clamping efficiency, and reduces the time consumption during the clamping process.
[0031] Two positioning slots 3 are provided with different inclination angles, and each positioning slot 3 represents a processing station. This means that during the processing, the operator can complete a specific process at one positioning slot 3 station and then directly transfer the spraying device 4 to another positioning slot 3 station with a preset inclination angle corresponding to the process, thus achieving continuous processing.
[0032] Compared to designing complex tooling fixtures separately for each process, integrating two positioning spurs 3 with different tilt angles into the same tooling reduces the number of tooling fixtures, lowers design costs, and shortens the development cycle.
[0033] For details, please refer to Figures 1 to 3 and Figure 8 One of the positioning grooves 3 has an inclination angle of 88°. In this process station, the drill bit needs to drill a first ultra-fine deep hole 43 with a diameter of 5mm and a depth of 297.4mm on the front end face of the injector body.
[0034] For details, please refer to Figures 1 to 6 and Figure 8 Another positioning groove 3 has an inclination angle of 50°. In this process station, the drill bit needs to drill a second ultra-fine deep hole 44 with a diameter of 3mm and a depth of 65.5mm on the front end face of the injector body.
[0035] The drill bit only needs to be aligned with the front end of the base plate 1. It can switch to different processing positions by moving left and right without adjusting the angle, and can process quickly. This ensures that the relative position of the drill bit and the ejector body is accurate during the drilling process, and minimizes drilling errors caused by angular deviations.
[0036] Furthermore, the pressure plate 21 has a U-shaped groove 211 for the screw 22 to be inserted into the central axis of the pressure plate 21. This U-shaped groove 211 greatly improves operational convenience during assembly. When the clamping assembly 2 needs to be installed, the operator can directly place the screw head 42 into the U-shaped groove 211 and then quickly align the threaded end of the screw 22 with the threaded hole 11 beside the positioning groove 3 to tighten it. Moreover, during subsequent processing, if the clamping force needs to be adjusted, since the screw head 42 is located in the U-shaped groove 211, the operator can easily use tools to rotate the screw 22, conveniently and quickly achieving fine-tuning of the clamping force and ensuring the stability of the spraying device 4 during processing.
[0037] Preferably, the clamping assembly 2 is provided in two sets. The two sets of clamping assemblies 2 work together to apply a larger and more uniform clamping force to the jetting device 4. During the processing, when the drill bit drills into the jetting device 4, it generates a large cutting force and vibration. A single set of clamping assemblies 2 may not be able to evenly distribute these external forces across the entire jetting device 4, resulting in loosening or displacement in localized areas. However, the two sets of clamping assemblies 2 can act on different positions of the body 41 of the jetting device 4, providing a stable clamping force from multiple directions simultaneously, ensuring that the jetting device 4 remains stable within the positioning groove 3.
[0038] Preferred options, please refer to Figure 7 and Figure 8 The base plate 1 has multiple vertically extending countersunk mounting holes 12. These holes facilitate the connection between the tooling and the processing equipment or work platform. When installing the positioning tooling, countersunk screws 22 can be used to securely fix the base plate 1 to the worktable of the equipment through these countersunk mounting holes 12. Due to the design of the countersunk mounting holes 12, the head 42 of the countersunk screw 22 can be embedded within the countersunk mounting hole 12, flush with the surface of the base plate 1, avoiding potential interference to the processing of the spraying device 4 caused by the protruding head 42 of the screw 22. This installation method makes the tooling more firmly fixed to the equipment, reducing positioning deviations caused by tooling loosening during processing, ensuring that the spraying device 4 maintains an accurate position throughout the entire processing, thereby improving processing accuracy and product quality.
[0039] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0041] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.
Claims
1. A positioning tool for ultra-fine deep long hole machining for clamping and positioning of a spray device, characterized in that, The device includes a base plate, a clamping assembly, and at least one positioning groove on the top surface of the base plate. The positioning groove extends through the device in the front-to-back direction. The spraying device is horizontally placed in the positioning groove. A threaded hole is provided on the side of the positioning groove. The clamping assembly includes a pressure plate, a screw, and a counterweight. One end of the pressure plate presses down on the body of the spraying device, and the other end presses down on the counterweight. The screw is vertically arranged in the middle of the pressure plate. The threaded end of the screw is connected to the threaded hole. The head of the screw provides downward pressure to the pressure plate. The head of the spraying device is aligned with the front end face of the pressure plate.
2. The positioning tooling for ultra-fine deep and long hole machining according to claim 1, wherein, The positioning groove includes a straight groove and supporting inclined surfaces arranged on both sides of the straight groove.
3. The positioning tooling for ultra-fine deep and long hole machining according to claim 2, wherein, The positioning grooves are provided in two places with different inclination angles, and each positioning groove represents a processing station.
4. The positioning tooling for ultra-fine deep and long hole machining according to claim 3, characterized in that, One of the positioning grooves has an inclination angle of 88°, and the other positioning groove has an inclination angle of 50°.
5. The positioning tooling for ultra-fine deep and long hole machining according to claim 1, wherein, The pressure plate has a U-shaped groove for screws to be inserted into the central axis of the pressure plate.
6. The positioning tooling for ultra-fine deep and long hole machining according to claim 1, wherein, The clamping assembly is provided in two sets.
7. The positioning tooling for ultra-fine deep and long hole machining according to claim 1, wherein, The base plate has multiple vertically extending countersunk mounting holes.