A right-angle pipe joint turning positioning tool

Abstract

The utility model discloses a right angle pipe joint turning positioning frock belongs to mechanical processing field. The frock includes base, clamp plate, clamp plate bolt subassembly and base bolt subassembly. Base is provided with the clamping structure for connecting with lathe, the positioning structure for accommodating and positioning work piece long lever and the eccentric structure for realizing automatic centering, clamp plate is fixed on the base through clamp plate bolt subassembly, is used for the fixed work piece long lever of pressing tightly, base bolt subassembly is along lathe main shaft radial setting, is used for directly pressing tightly the boss structure of work piece on long lever and short lever junction. The utility model discloses through above -mentioned structure, has solved right angle pipe joint's difficult clamping on general fixture, correction is complicated, and the problem of easy producing size out of tolerance, has realized work piece's quick positioning and automatic centering, has improved clamping efficiency and processing accuracy significantly, and has prevented work piece surface damage effectively.

Description

Technical Field

[0001] This utility model belongs to the field of machining technology, specifically relating to a positioning fixture for turning right-angle pipe joints. Background Technology

[0002] Pipe fittings are widely used in daily life and work, primarily for connecting pipes. Pipes are the main channels for fluid and gas transmission, especially conduits that bear hydraulic or pneumatic pressure. The sealing performance of these pipes is crucial, and the surface quality of the pipe fittings directly affects this performance. In machining, right-angle pipe fittings are typically clamped and positioned using lathe-based general-purpose fixtures (such as four-jaw chucks). However, as... Figure 1 As shown, due to the L-shaped irregular structure of the right-angle pipe joint, there is a spatial angle between its long and short rods, which leads to the following problems when using general-purpose fixtures: First, the initial positioning of the workpiece is difficult, requiring repeated manual adjustments and corrections to find the reference axis of the long and short rods, which is cumbersome and time-consuming; Second, during the clamping process, due to the asymmetrical shape of the pipe joint, the clamping force is not easily distributed evenly, which can easily cause workpiece deformation or loosening during clamping. During turning, the workpiece will be offset by the cutting force, resulting in elliptical, tapered, or even dimensional deviations on the machined surface, making it difficult to ensure the machining accuracy and quality consistency of the parts. Utility Model Content

[0003] The purpose of this invention is to solve the problems of difficult clamping, cumbersome calibration, and easy dimensional deviations in the machining of right-angle pipe joints in the prior art, and to propose a special machining positioning fixture.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] A right-angle pipe joint turning positioning fixture is provided, including a base, a pressure plate, a base bolt assembly, and a pressure plate bolt assembly;

[0006] The base is equipped with a clamping structure for connecting to the lathe spindle, a positioning structure for accommodating and positioning the long rod of the right-angle pipe joint being machined, and an eccentric structure for providing automatic centering for the right-angle pipe joint.

[0007] The pressure plate is mounted on the base and is used to press and fix the long rod of the right-angle pipe joint;

[0008] The bolts in the base bolt assembly are arranged radially along the lathe spindle to clamp the boss structure on the right-angle tube joint located at the connection between the long and short rods;

[0009] The pressure plate bolt assembly is used to secure the pressure plate to the base.

[0010] Furthermore, the positioning structure includes: an outer cylindrical positioning surface of the long rod, for mating with the outer cylindrical surface of the long rod of the right-angle pipe connector; and an end positioning surface of the long rod, for mating with the end face of the long rod of the right-angle pipe connector. The outer cylindrical positioning surface and the end positioning surface of the long rod work together to restrict the five degrees of freedom of the right-angle pipe connector in space.

[0011] Furthermore, the eccentric structure is achieved by pre-setting an eccentricity between the central axis of the positioning structure and the central axis of the clamping structure.

[0012] Furthermore, the contact surface between the pressure plate and the long rod of the right-angle pipe joint is constructed as an arc-shaped surface that matches the outer circumference of the long rod to increase the contact area.

[0013] Furthermore, a U-shaped opening groove is provided on the pressure plate, and the end face of the U-shaped opening groove forms a bolt support surface for supporting the head of the bolt in the pressure plate bolt assembly.

[0014] Furthermore, a groove is provided on the base, and the groove is located adjacent to the positioning structure to avoid the boss structure of the right-angle pipe joint.

[0015] Furthermore, the clamping structure is a clamping bar located on one end surface of the base, which is used to be clamped by the three-jaw chuck of the lathe.

[0016] Furthermore, the base also includes a weight-reducing structure, which is a weight-reducing step formed on the base body, to concentrate the main mass of the tooling at the axis of the clamping structure.

[0017] Furthermore, the pressure plate bolt assembly includes at least two pressure plate bolts, respectively arranged on both sides of the long rod of the right-angle pipe joint.

[0018] Furthermore, the base bolt assembly includes at least three base bolts arranged around the boss structure for laterally clamping the boss structure.

[0019] The advantages of this utility model are:

[0020] 1. The right-angle pipe joint turning positioning fixture provided by this utility model combines the positioning structure on the base with the preset eccentric structure. After the workpiece is placed, initial positioning is completed, quickly bringing the axis of the short rod to be processed close to coaxiality with the lathe spindle axis. This eliminates the need for manual adjustment of the eccentricity by the operator, significantly reducing the clamping and alignment time for a single workpiece from the original average of 15 minutes to approximately 4 minutes, thus significantly improving production efficiency.

[0021] 2. This fixture uses a base bolt assembly to radially clamp the workpiece boss at multiple points, combined with the surface contact clamping method of the pressure plate, providing an extremely stable and reliable clamping force. This effectively resists cutting forces and prevents the workpiece from shifting, vibrating, or rotating during processing, thus avoiding shape errors such as ellipticity and taper, as well as dimensional deviations. Furthermore, the unique eccentric structure fundamentally ensures the uniformity of the processed wall thickness.

[0022] 3. This tooling eliminates the complicated and repeated calibration process when using a four-jaw chuck. The operator only needs to use a wrench to tighten the pressure plate bolts and base bolts to complete the clamping. The operation steps are simple and intuitive, reducing the dependence on the operator's skill level and reducing labor intensity. Attached Figure Description

[0023] The above and / or other features and advantages of the present invention will become more readily understood from the following description with reference to the accompanying drawings, which are not drawn to scale and some features are enlarged or reduced to show details of specific parts.

[0024] Figure 1 It is a 3D diagram of a right-angle pipe joint;

[0025] Figure 2 This is a perspective view of the right-angle pipe joint turning and positioning fixture of this utility model in use;

[0026] Figure 3 This is a front view of the right-angle pipe joint turning and positioning fixture of this utility model in use;

[0027] Figure 4 This is a cross-sectional view of the base in this utility model;

[0028] Figure 5 This is a perspective view of the base in this utility model;

[0029] Figure 6 This is a perspective view of the pressure plate of this utility model.

[0030] In the picture:

[0031] 1-Base; 11-Clamping rod; 12-Outer circle positioning surface of long rod; 13-End positioning surface of long rod; 14-Weight reduction step; 15-Threaded hole of base; 16-Threaded hole of pressure plate; 17-Groove; 2-Pressure plate; 21-Arc-shaped surface; 22-U-shaped opening groove; 31-First base bolt; 32-Second base bolt; 33-Third base bolt; 41-First pressure plate bolt; 42-Second pressure plate bolt;

[0032] 100 - Right-angle pipe joint, 101 - Long rod, 102 - Short rod, 103 - Boss structure. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments thereof. It should be noted that the following detailed description of the present invention is for illustrative purposes only and is not intended to limit the scope of the invention.

[0034] It should be noted that, in the context of this utility model, the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "inner," "outer," "clockwise," and "counterclockwise," 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.

[0035] Furthermore, terms such as "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0036] Reference Figure 2 and Figure 3 The right-angle pipe joint turning and positioning fixture, as an exemplary embodiment of this utility model, mainly consists of four parts: a base 1, a pressure plate 2, a base bolt assembly, and a pressure plate bolt assembly, used for turning and positioning the right-angle pipe joint. Figure 1 The right-angle pipe connector 100, as exemplarily shown, is clamped and positioned for machining. The right-angle pipe connector 100 includes a long rod 101, a short rod 102, and a boss structure 103 located at the junction of the long rod 101 and the short rod 102. In the illustrated example, the boss structure 103 is circular, but it could also be a cuboid or other structure.

[0037] To describe the structure of this utility model more intuitively and accurately, a three-dimensional coordinate system is constructed on the tooling, so as to... Figure 4 The axis of the clamping rod 11, i.e., the axis of the lathe spindle, is taken as the Z-axis. Figure 3 The axis of the second clamping bolt 32, which is collinear with the axis of the long rod 101, is taken as the Y-axis, and the axis of the third base clamping bolt 33, which is in the same plane as the axis of the second clamping bolt 32 and perpendicular to the second clamping bolt 32, is taken as the X-axis.

[0038] Base 1 is the core carrier of the tooling. (Combined with...) Figure 4 and Figure 5The base 1 is equipped with a clamping structure for connecting to the lathe spindle. Its main function is to fix the base 1 on the lathe and to fix the workpiece on the tooling. In the illustrated embodiment, the clamping structure is a clamping rod 11 located on one end surface of the base 1. The clamping rod 11 is used to be clamped by the lathe's three-jaw chuck, thereby achieving a quick and reliable connection between the tooling and the lathe spindle.

[0039] The base 1 is also provided with a positioning structure for accommodating and positioning the long rod 101 of the right-angle pipe connector 100 being processed. Its main function is to achieve rapid workpiece positioning and reference correction. In some embodiments of this invention, the positioning structure includes an outer cylindrical positioning surface 12 and an end positioning surface 13 of the long rod. These positioning structures work together to effectively limit the five degrees of freedom of the workpiece. The outer cylindrical positioning surface 12 of the long rod mates with the outer cylindrical surface of the long rod 101 of the right-angle pipe connector 100 to restrict its movement in the Z and X axes. The outer cylindrical positioning surface 12 is shown in the figure as a rectangular cross-section, but its cross-section is more preferably arc-shaped; this invention does not particularly limit this. The end positioning surface 13 of the long rod mates with the end face of the long rod 101 of the right-angle pipe connector 100 to restrict its movement in the Y axis direction. The above-mentioned mating relationships also jointly restrict the rotation of the right-angle pipe connector 100 around the X and Z axes. At this point, the workpiece has only one degree of freedom of rotation around its own long rod axis (i.e., the Y-axis) in space that is not restricted. This degree of freedom is constrained by the subsequent pressure plate 2 and the base bolt assembly.

[0040] The base 1 is also equipped with an eccentric structure for automatically centering the right-angle pipe connector 100. The eccentric structure can realize the automatic centering function of the pipe connector workpiece. By pre-setting an eccentric amount for the tooling, the eccentric distance between the axis of the workpiece to be machined surface and the axis of the machine tool spindle is eliminated, thereby realizing that the axis of the workpiece is coaxial with the lathe spindle. During assembly, the outer cylindrical surface and end face of the long rod 101 of the right-angle pipe connector 100 are respectively pressed against the two positioning surfaces mentioned above, which can realize the rapid and accurate reference positioning of the workpiece in the Y-axis and Z-axis directions. Then, the offset of the short rod 102 of the right-angle pipe connector 100 in the X-axis is measured with a dial indicator to find the center of the X-axis and realize the X-axis positioning. This fundamentally avoids the tedious process of repeated manual alignment when using general fixtures.

[0041] In a preferred embodiment, the eccentric structure of the base 1 is ensured through the manufacturing process. During base machining, the central axis of the positioning structure can be pre-offset by a precisely calculated eccentricity relative to the central axis of the clamping structure, such as the clamping rod 11. This pre-calculated eccentricity automatically compensates for casting errors in the workpiece blank, ensuring that after the workpiece is clamped, the axis of the short rod 102 to be machined automatically approaches the lathe spindle axis, achieving "automatic centering," greatly reducing subsequent correction time, and directly ensuring the uniformity of the wall thickness after machining.

[0042] The base 1 may also additionally include a weight-reducing structure, the main functions of which are, on the one hand, to reduce the weight of the tooling, making it easier for workers to assemble and disassemble the tooling, and on the other hand, to concentrate the main weight of the tooling at the axis of the clamping rod, ensuring that when the tooling rotates around the spindle axis of the lathe, it does not become unbalanced due to centripetal force, thus preventing axial offset. By way of example and not limitation, the weight-reducing structure is a weight-reducing step 14 formed on the base body.

[0043] To enable the connection of the base bolt assembly, the base 1 is machined with several base threaded holes 15 and several pressure plate threaded holes 16, which will be described in detail below.

[0044] Furthermore, a groove 17 may be provided on the base 1, which is located adjacent to the positioning structure. The function of the groove 17 is to accommodate boss structures 103 of varying sizes on the workpiece, providing strong versatility and effectively preventing assembly interference between the tooling and the workpiece. The shape of the groove 17 can match the shape of the boss structure 103. For example, when the boss structure 103 is a circular structure as shown, the groove 17 is also circular; when the boss structure 103 is a rectangular structure, the groove 17 can be a suitable rectangular shape.

[0045] Combination Figure 6 The pressure plate 2 is mounted on the base 1 and is used to directly contact the workpiece and press and fix the long rod 101 of the right-angle pipe joint 100. In a preferred embodiment of this utility model, the pressure plate 2 includes a part that contacts the right-angle pipe joint 100 to press the workpiece and a part that is connected and fixed to the base 1. The contact surface between the bottom of the pressure plate 2 and the long rod 101 of the right-angle pipe joint 100 can be constructed as an arc-shaped surface 21 that adapts to the outer peripheral surface of the long rod 101 to increase the contact area and avoid surface damage.

[0046] In addition, a U-shaped opening groove 22 may be provided on the pressure plate 2. The end face of the U-shaped opening groove 22 constitutes a bolt support surface for supporting the head of the bolt in the pressure plate bolt assembly. This U-shaped opening groove design has two advantages: First, it provides lateral operating space for the wrench, making it very convenient to tighten and loosen the bolt, thereby improving clamping efficiency; second, it provides a uniform and flat bearing surface for the bolt head, ensuring that the clamping force can be transmitted vertically and evenly downwards, thereby avoiding uneven force on the pressure plate.

[0047] Return to reference Figure 2 and Figure 3 The bolts in the base bolt assembly are arranged radially along the lathe spindle to clamp the boss structure 103 on the right-angle pipe joint. In an exemplary embodiment, the base bolt assembly includes at least three base bolts, such as a first base bolt 31, a second base bolt 32, and a third base bolt 33, which are arranged around the boss structure 103 and are for passing through base threaded holes 15 on the base 1 (see...). Figure 4 The boss structure 103 is pressed in from the side. The tail of each base bolt is not chamfered, the purpose of which is to increase the contact area of ​​the workpiece pressing part. Increasing the contact area can prevent the workpiece from being pinched, because if the contact area is small, the stress on the workpiece will be concentrated, which will easily cause dents and mechanical damage. On the other hand, it can effectively fix the workpiece. If the workpiece pressing area is small, when turning, the workpiece is subjected to cutting force and is prone to displacement, which will result in the machined surface having taper and elliptic, or even dimensional deviation.

[0048] The pressure plate bolt assembly is used to fix the pressure plate 2 to the base 1. In an exemplary embodiment, the pressure plate bolt assembly includes at least two pressure plate bolts, as shown, a first pressure plate bolt 41 and a second pressure plate bolt 42, which are respectively arranged on both sides of the long rod of the right-angle pipe joint. The first pressure plate bolt 41 and the second pressure plate bolt 42 are symmetrical on both sides of the long rod and pass through the part of the pressure plate 2 that is connected and fixed to the base 1 and the pressure plate threaded hole 16 on the base 1, thereby ensuring the balance and stability of the clamping force.

[0049] The right-angle pipe joint turning positioning fixture provided by this utility model utilizes a positioning surface and an eccentric structure to achieve rapid positioning and automatic centering of the workpiece, reducing the single-piece clamping and correction time from an average of 15 minutes to about 4 minutes. Through surface contact clamping and multi-point radial locking, it can effectively prevent the workpiece from displacement, vibration or rotation during processing, and the eccentric structure can ensure the uniformity of wall thickness processing. At the same time, only a wrench is needed to tighten the bolts during operation, which requires low operator skills and reduces labor intensity.

[0050] In addition, the arc-shaped surface design of the pressure plate in contact with the workpiece and the non-beveled flat surface design of the base bolt tail both increase the contact area of ​​the clamping part, realize "surface contact" clamping, effectively disperse the clamping force, avoid stress concentration, completely eliminate mechanical damage such as clamping marks and indentations on the workpiece surface, and ensure the surface quality of the workpiece and the dimensional accuracy of the product.

[0051] Finally, it should be noted that the features mentioned and / or shown in the above description of exemplary embodiments of the present invention can be combined in the same or similar manner with one or more other embodiments, combined with features in other embodiments, or substituted for corresponding features in other embodiments. These combined or substituted technical solutions should also be considered as included within the protection scope of the present invention.

Claims

1. A right-angle pipe joint turning and positioning fixture, characterized in that: Includes a base, a pressure plate, a base bolt assembly, and a pressure plate bolt assembly; The base is provided with a clamping structure for connecting to the lathe spindle, a positioning structure for accommodating and positioning the long rod of the right-angle pipe joint being machined, and an eccentric structure for providing automatic centering for the right-angle pipe joint. The pressure plate is mounted on the base and is used to press and fix the long rod of the right-angle pipe joint; The bolts in the base bolt assembly are arranged radially along the lathe spindle to press the boss structure on the right-angle tube joint located at the connection between the long rod and the short rod. The pressure plate bolt assembly is used to fix the pressure plate to the base.

2. The right-angle pipe joint turning and positioning fixture according to claim 1, characterized in that, The positioning structure includes: The outer cylindrical positioning surface of the long rod is used to mate with the outer cylindrical surface of the long rod of the right-angle pipe joint; The positioning surface at the end of the long rod is used to mate with the end face of the long rod of the right-angle pipe joint; The outer circular positioning surface of the long rod and the positioning surface at the end of the long rod work together to restrict the five degrees of freedom of the right-angle pipe joint in space.

3. The right-angle pipe joint turning and positioning fixture according to claim 1 or 2, characterized in that: The eccentric structure is achieved by pre-setting an eccentricity between the central axis of the positioning structure and the central axis of the clamping structure.

4. The right-angle pipe joint turning and positioning fixture according to claim 1 or 2, characterized in that: The contact surface between the pressure plate and the long rod of the right-angle pipe joint is constructed as an arc-shaped surface that adapts to the outer circumferential surface of the long rod to increase the contact area.

5. The right-angle pipe joint turning and positioning fixture according to claim 1 or 2, characterized in that: The pressure plate has a U-shaped opening groove, and the end face of the U-shaped opening groove forms a bolt support surface for supporting the head of the bolt in the pressure plate bolt assembly.

6. The right-angle pipe joint turning and positioning fixture according to claim 1 or 2, characterized in that: The base has a groove, which is located adjacent to the positioning structure to avoid the boss structure of the right-angle pipe joint.

7. The right-angle pipe joint turning and positioning fixture according to claim 1 or 2, characterized in that: The clamping structure is a clamping rod disposed on one end surface of the base, and the clamping rod is used to be clamped by the three-jaw chuck of the lathe.

8. The right-angle pipe joint turning and positioning fixture according to claim 1 or 2, characterized in that: The base also includes a weight-reducing structure, which is a weight-reducing step formed on the base body to concentrate the main mass of the tooling at the axis of the clamping structure.

9. The right-angle pipe joint turning and positioning fixture according to claim 1 or 2, characterized in that: The pressure plate bolt assembly includes at least two pressure plate bolts, which are respectively arranged on both sides of the long rod of the right-angle pipe joint.

10. The right-angle pipe joint turning and positioning fixture according to claim 1 or 2, characterized in that: The base bolt assembly includes at least three base bolts arranged around the boss structure for laterally pressing the boss structure.

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