A positioning tool for processing of metal mold casting conductors

Abstract

The utility model belongs to the technical field of foundry conductor processing, disclose a kind of positioning tool for metal type foundry conductor processing, including flange and its positioning mechanism, supporting mechanism, locking mechanism and pressure mechanism on it, positioning mechanism is inserted with conductor end face and is positioned, pressure mechanism fixed end face, supporting mechanism is parallel to conductor and is fixed conductor by locking mechanism, ensure that conductor surface center to be processed and flange center are collinear. Through tooling accurate positioning and firm fixation, make conductor keep stable when processing, avoid the problem that the cutter tip linear velocity is insufficient and the feed value is low caused by the rotation speed limit of original numerical control boring machine process, simultaneously eliminate the vibration caused by slide rail mechanical clearance through supporting mechanism, to optimize processing process. Adopt this tooling significantly improve processing efficiency, improve the roughness of processing surface, reduce the dependence on subsequent polishing process.

Description

Technical Field

[0001] This utility model belongs to the field of casting conductor processing technology, specifically relating to a positioning fixture for processing metal casting conductors. Background Technology

[0002] Gas-insulated metal switchgear is a compact power device that integrates high-voltage electrical components within a sealed metal housing filled with pressurized insulating gas. Its core function is to control, protect, and transmit power in power systems. It is widely used in high-voltage, ultra-high-voltage, and medium-voltage power grids, and its compact structure, high reliability, and environmental adaptability have made it a core component of modern power grids. Aluminum alloy casting conductors are standard components of this device. These metal casting conductors are typically conductor castings obtained by solidifying liquid aluminum alloy in a metal mold cavity. Installed within the sealed housing, they, along with internal components such as the moving side assembly, stationary side assembly, busbar assembly, and electric operating mechanism, complete the overall assembly of the disconnecting switch.

[0003] The existing machining processes for metal mold casting conductors include scribing, horizontal machining center, and CNC boring machine processes. The scribing process involves marking the spatial dimensions of the machining areas, the conductor centerline, and the end face machining allowance lines on the conductor part, using the blank shape as a reference. The horizontal machining center process completes the machining of the machinable parts of the conductor in this step. However, due to limitations in the equipment's machining range, a certain position on the conductor's outer diameter, end face, and arc cannot be finished in this step; therefore, semi-finishing is performed on that position to allow for finishing in the subsequent CNC boring machine process. The CNC boring machine process uses the part of the conductor that has already been machined in the previous step, along with the square box and mandrel, as positioning references. A jack provides auxiliary support, and the CNC boring machine uses a tool holder mounted on a rotary table to machine the flange end face, outer diameter, and arc of the conductor. Currently, using existing machining processes for this type of eccentrically elongated conductor part in the CNC boring machine process results in low machining efficiency and poor surface roughness. The outer diameter of the conductor is machined by mounting a tool post and a cutting tool on the CNC boring machine's turntable. However, due to the limitations of the turntable's maximum speed and the small diameter of the part of the conductor being machined, the cutting tool tip mounted on the turntable's tool post is almost located in the center of the turntable. This results in a low tool tip linear velocity and a correspondingly low tool feed value, leading to low machining efficiency for this part of the conductor and a long average machining time for each conductor. In addition, due to the mechanical backlash in the turntable's slide rail, it is difficult to guarantee the surface roughness value required by the drawing, and subsequent polishing processes are needed to achieve the drawing requirements.

[0004] It is evident that the existing metal mold casting conductor machining process suffers from low machining efficiency and poor surface roughness in the CNC boring process. Utility Model Content

[0005] This invention provides a positioning fixture for machining conductors in metal castings. Using this fixture on eccentrically elongated conductor parts can improve the accuracy of the machining surface and the machining efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical content: A positioning fixture for machining conductors in metal mold castings, comprising a flange; The flange is equipped with a positioning mechanism, a support mechanism, a locking mechanism, and a pressing mechanism; The positioning mechanism is located on the top of the flange and is inserted into the conductor end face of the conductor to position the conductor end face; The clamping mechanism passes through the conductor end face and is connected to the flange to clamp the conductor end face; The support mechanism is arranged parallel to the conductor, with one end fixed to the flange and the other end fixedly connected to the conductor through the locking mechanism; The center of the surface to be processed on the top of the conductor is collinear with the center of the flange.

[0007] Furthermore, the positioning mechanism includes at least two positioning pins, with one end of the positioning pin connected to the flange and the other end forming a positioning engagement with a first through hole opened on the conductor end face.

[0008] Furthermore, the clamping mechanism includes at least two clamping screws, which pass through a second through hole on the conductor end face and are threadedly connected to the flange.

[0009] Furthermore, the support mechanism includes a hollow sleeve; One end of the hollow sleeve is connected to the flange, and the other end has a bent plate at the top. A first locking screw is inserted into the first side plate of the bent plate; One end of the first locking screw passes through the bent plate and is connected to the top of the hollow sleeve, while the other end is locked and fixed by the first locking nut. The second side plate of the bent plate is connected to the conductor through the locking mechanism.

[0010] Furthermore, the locking mechanism includes a second locking screw, a locking nut, and a second locking cap; The second locking screw is inserted sequentially through the radial hole of the conductor and the second side plate of the bent plate. One end of the second locking screw is fixed to the conductor by a locking nut, and the other end is fixed to the second side plate of the bent plate by a second locking nut.

[0011] Furthermore, a gasket is provided between the first locking nut and the first side plate of the bent plate.

[0012] Furthermore, the gasket is a rubber gasket.

[0013] Furthermore, the positioning mechanism includes multiple positioning pins; the positioning pins are arranged symmetrically between each pair.

[0014] Furthermore, the clamping mechanism includes multiple clamping screws; the clamping screws are arranged symmetrically between each pair of clamping screws.

[0015] Furthermore, the bottom of the flange is clamped and held by multiple jaws.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a positioning fixture for machining conductors in metal castings, including a flange and a positioning mechanism, a support mechanism, a locking mechanism, and a clamping mechanism. The positioning mechanism is inserted and positioned to the conductor end face, the clamping mechanism fixes the end face, and the support mechanism is parallel to the conductor and fixes the conductor through the locking mechanism, ensuring that the center of the conductor's machining surface is collinear with the flange center. Through precise positioning and secure fixing by the fixture, the conductor remains stable during machining, avoiding the problems of insufficient tool tip linear speed and low feed rate caused by the rotational speed limitation of the rotary table in the original CNC boring machine process. Simultaneously, the support mechanism eliminates vibration caused by mechanical clearance of the slide rail, thereby optimizing the machining process. Using this fixture significantly improves machining efficiency, improves the surface roughness, and reduces reliance on subsequent polishing processes. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of the metal mold casting conductor provided in the embodiment of this utility model; Figure 2 A schematic diagram of conventional machining operations for metal mold casting conductors provided in this embodiment of the utility model; Figure 3 A schematic diagram of a positioning fixture for machining conductors in metal mold castings is provided for an embodiment of this utility model; Figure 4 A side view of another positioning fixture for machining conductors in metal castings provided in an embodiment of this utility model.

[0018] Figure label: 1. Flange; 2. Hollow sleeve; 3. Bend plate; 4. First locking nut; 5. First locking screw; 6. Second locking nut; 7. Locking nut; 8. Second locking screw; 9. Conductor; 10. Clamping mechanism; 11. Positioning mechanism; 12. Conductor end face; 13. Radial hole; 14. Surface to be machined. Detailed Implementation

[0019] To make the technical problem solved by this utility model, the technical solution, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of this utility model. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, 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, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0026] As mentioned in the background section, such as Figure 1 and Figure 2 As shown, conductor 9 is an ultra-long eccentric conductor component with a conductor length of 535mm or more. For this type of component, the following methods are typically used: Figure 2 The horizontal machining center and CNC boring machine processes shown in the diagram will result in low machining efficiency and poor surface roughness.

[0027] To address the aforementioned problems, this embodiment provides a positioning fixture for machining conductors in metal castings, including a clamping mechanism, a locking mechanism, a positioning mechanism, and a supporting mechanism. The supporting mechanism supports the entire positioning fixture. The positioning mechanism accurately positions the conductor of the casting to be machined, and works in conjunction with the clamping and locking mechanisms to position and lock the housing of the casting. In actual machining, there is an offset between the center of the flange to be machined and the positioning reference center. This offset is corrected by using the positioning mechanism of the fixture to counteract the offset, ensuring that the center of the flange is aligned with the center of the surface to be machined. The top clamping and machining method involves clamping the bottom flange of the fixture with a lathe's three-jaw chuck. The conductor flange face is pressed by the positioning and clamping mechanisms at the bottom of the fixture flange. Then, the support and locking mechanisms of the fixture achieve support and locking in the middle of the conductor. At the same time, the tailstock of the CNC lathe uses a live center to provide auxiliary support for the pre-machined center hole on the end face of the conductor to be machined. Finally, the positioned and clamped casting conductor to be machined is placed on the CNC lathe for machining. No adjustment or alignment is required, saving alignment time and avoiding alignment errors. This solves the problem that ultra-long eccentric conductor parts (conductor length 535mm) cannot be machined on a lathe.

[0028] like Figure 3As shown, this embodiment provides a positioning fixture for machining conductors in metal castings, including a flange 1. The flange 1 is provided with a positioning mechanism 11, a support mechanism, a locking mechanism, and a clamping mechanism 10. The positioning mechanism 11 is located on the top of the flange 1 and is inserted into the conductor end face 12 of the conductor 9 to position the conductor end face 12. The clamping mechanism 10 passes through the conductor end face 12 and is connected to the flange 1 to clamp the conductor end face 12. The support mechanism is arranged parallel to the conductor 9, with one end fixed to the flange 1 and the other end fixedly connected to the conductor 9 through the locking mechanism. The center of the surface to be machined 14 on the top of the conductor 9 is collinear with the center of the flange 1.

[0029] Combination Figure 4 As shown, an exemplary positioning fixture for machining conductors in metal mold castings has the following specific structure: The flange 1 of this positioning fixture is clamped at the bottom by multiple jaws to fix the entire fixture. A positioning mechanism 11 is provided on the top of the flange 1. The positioning mechanism 11 includes at least two positioning pins, which are symmetrically arranged. The first end of the positioning pin is connected to the flange 1, and the other end is positioned in conjunction with the first through hole opened on the conductor end face 12 of the conductor 9 to complete the positioning of the conductor end face 12.

[0030] The clamping mechanism 10 is also set on the flange 1, which includes at least two clamping screws. The clamping screws are also symmetrically arranged between each pair. These clamping screws pass through the second through hole opened on the conductor end face 12 and are threadedly connected to the flange 1, thereby clamping the conductor end face 12.

[0031] The support mechanism is arranged parallel to the conductor 9. It includes a hollow sleeve 2, one end of which is fixedly connected to the flange 1, and the top of the other end is provided with a bent plate 3. A first locking screw 5 is inserted into the first side plate of the bent plate 3. One end of the first locking screw 5 passes through the bent plate 3 and is connected to the top of the hollow sleeve 2. The other end is locked and fixed by a first locking nut 4, and a rubber gasket is provided between the first locking nut 4 and the first side plate of the bent plate 3.

[0032] The second side plate of the bent plate 3 is fixedly connected to the conductor 9 through a locking mechanism. The locking mechanism includes a second locking screw 8, a locking nut 7, and a second locking nut 6. The second locking screw 8 is inserted sequentially through the radial hole 13 of the conductor 9 and the second side plate of the bent plate 3. One end of the second locking screw 8 is fixed to the conductor 9 through the locking nut 7, and the other end is fixed to the second side plate of the bent plate 3 through the second locking nut 6.

[0033] Through the coordination of the above mechanisms, the center of the top surface 14 to be processed of the conductor 9 is collinear with the center of the flange 1.

[0034] Preferably, in this embodiment, the positioning mechanism uses a positioning pin that engages with the through hole on the conductor end face. This design provides reliable reference positioning, prevents the conductor from shifting during processing, ensures the positional accuracy of the processed surface, and thus improves overall processing stability.

[0035] Preferably, in this embodiment, the clamping mechanism uses a clamping screw that passes through the conductor end face and is threaded to the flange. This structure achieves adjustable and powerful clamping, effectively eliminating the risk of conductor loosening and enhancing the fixing strength to support continuous, efficient processing.

[0036] Preferably, in this embodiment, the support mechanism includes a hollow sleeve and a bent plate assembly, connected by a locking screw and a nut. This assembly provides rigid support and absorbs some vibration, adapts to the geometric characteristics of the conductor, and reduces surface defects caused by processing vibration.

[0037] Preferably, in this embodiment, the locking mechanism specifically includes a locking screw and a nut passing through the radial hole of the conductor to fix the bent plate. This multi-stage locking mechanism strengthens the connection rigidity between the conductor and the support, prevents micro-movements during processing, and ensures processing accuracy.

[0038] Preferably, in this embodiment, a gasket is provided between the first locking nut and the bent plate. The gasket acts as a buffer, reducing impact wear on the threaded parts, extending the service life of the tooling, and reducing maintenance requirements.

[0039] Preferably, in this embodiment, the gasket is made of rubber. The elastic properties of rubber provide excellent vibration damping, further suppressing the transmission of processing vibrations and improving the uniformity of the surface roughness of the processed surface.

[0040] Preferably, in this embodiment, the positioning pins are arranged symmetrically. This symmetrical layout ensures uniform distribution of positioning force, avoids conductor deformation caused by stress concentration on one side, and optimizes positioning accuracy.

[0041] Preferably, in this embodiment, the clamping screws are arranged symmetrically. Symmetrical clamping generates a balanced clamping force, preventing processing errors caused by uneven force on the conductor and maintaining the geometric integrity of the processed surface.

[0042] Preferably, in this embodiment, the bottom of the flange is secured by clamps. This clamping method simplifies the installation process of the tooling on the equipment, facilitates quick replacement and positioning, and improves overall processing efficiency.

[0043] After the positioning fixture for machining conductors of metal castings provided in this embodiment is put into use, the output of parts per shift increases from 8 pieces / shift to 20 pieces / shift, and the processing efficiency is improved by 150%. According to the current processing fee of RMB 1.57 / minute for the company's machining process, the average processing fee saved per shift by using this fixture is (20-8)×24×1.57=452.16 (RMB), as shown in Table 1.

[0044] Table 1 shows the comparison of shift output before and after processing with metal mold housing full blank tooling.

[0045] In summary, this utility model provides a positioning fixture for machining conductors in metal mold castings, which has the following advantages compared to existing machining methods: First, this utility model utilizes the offset between the center of the flange to be processed and the center of the positioning reference. By using the tooling positioning device to offset this offset in the opposite direction, the center of the tooling flange is made consistent with the center of the surface to be processed. Secondly, this invention eliminates the need for alignment adjustments, saving alignment time and avoiding alignment errors. It also solves the problem in existing technologies that ultra-long eccentric conductor parts (conductor length 535mm) cannot be machined on a lathe. Third, this utility model optimizes the original machining process of CNC boring and milling to CNC lathe turning, which improves the machining efficiency by more than 150%; it is also applicable to existing CNC lathes such as CK63150 and CK7840.

[0046] Fourth, the positioning fixture has a reasonable structural design, and the clamping rigidity and clamping effect are more stable and reliable. By selecting a suitable machining surface (completed in the previous process) as the positioning reference for CNC lathe finishing, the original machining process of CNC boring and milling is optimized to CNC lathe turning, which improves the machining efficiency by more than 150%. It is also universal for existing CK63150 and CK7840 CNC lathes.

[0047] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. A positioning fixture for machining conductors in metal mold castings, characterized in that, Including flange (1); The flange (1) is provided with a positioning mechanism (11), a support mechanism, a locking mechanism and a pressing mechanism (10). The positioning mechanism (11) is located on the top of the flange (1) and is inserted into the conductor end face (12) of the conductor (9) to position the conductor end face (12); The clamping mechanism (10) passes through the conductor end face (12) and is connected to the flange (1) to clamp the conductor end face (12); The support mechanism is arranged parallel to the conductor (9), with one end fixed to the flange (1) and the other end fixedly connected to the conductor (9) through the locking mechanism; The center of the top surface (14) of the conductor (9) to be processed is collinear with the center of the flange (1).

2. The positioning fixture for machining conductors in metal mold castings according to claim 1, characterized in that, The positioning mechanism (11) includes at least two positioning pins. The first end of the positioning pin is connected to the flange (1), and the other end forms a positioning fit with the first through hole opened on the conductor end face (12).

3. A positioning fixture for machining conductors in metal mold castings according to claim 1, characterized in that, The clamping mechanism (10) includes at least two clamping screws, which are threaded to the flange (1) after passing through a second through hole opened in the conductor end face (12).

4. A positioning fixture for machining conductors in metal mold castings according to claim 1, characterized in that, The support mechanism includes a hollow sleeve (2); The hollow sleeve (2) is connected to the flange (1) at one end and has a bent plate (3) at the top of the other end. A first locking screw (5) is inserted into the first side plate of the bent plate (3); One end of the first locking screw (5) passes through the bent plate (3) and is connected to the top of the hollow sleeve (2), while the other end is locked and fixed by the first locking nut (4); The second side plate of the bent plate (3) is connected to the conductor (9) through the locking mechanism.

5. A positioning fixture for machining conductors in metal mold castings according to claim 4, characterized in that, The locking mechanism includes a second locking screw (8), a locking nut (7), and a second locking cap (6); The second locking screw (8) is inserted sequentially through the radial hole (13) of the conductor (9) and the second side plate of the bent plate (3). One end of the second locking screw (8) is fixed to the conductor (9) by the locking nut (7), and the other end is fixed to the second side plate of the bent plate (3) by the second locking nut (6).

6. A positioning fixture for machining conductors in metal mold castings according to claim 4, characterized in that, A gasket is provided between the first locking nut (4) and the first side plate of the bent plate (3).

7. A positioning fixture for machining conductors in metal mold castings according to claim 6, characterized in that, The gasket is a rubber gasket.

8. A positioning fixture for machining conductors in metal mold castings according to claim 1, characterized in that, The positioning mechanism (11) includes multiple positioning pins; the positioning pins are arranged symmetrically between each pair of positioning pins.

9. A positioning fixture for machining conductors in metal mold castings according to claim 1, characterized in that, The clamping mechanism (10) includes multiple clamping screws; the clamping screws are arranged symmetrically between each pair of clamping screws.

10. A positioning fixture for machining conductors in metal mold castings according to claim 1, characterized in that, The bottom of the flange (1) is clamped by multiple jaws.

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