An end face positioning fixture for thin-walled parts

Abstract

The utility model discloses a kind of end face positioning fixtures for thin-walled parts, belong to thin-walled parts assembly technical field, fixture includes stud, hexagon nut, pressing plate, adjusting support, first inner hexagonal cylindrical head screw, pressure head, compression spring, bottom plate, second inner hexagonal cylindrical head screw and V-shaped support group, V-shaped support group is fixed in bottom plate by second inner hexagonal cylindrical head screw, pressing plate is connected with bottom plate by stud and adjusting support, pressing plate is cooperated with adjusting support and stud, so as to limit pressing plate can only move along front-back direction, pressure head is connected with pressing plate by first inner hexagonal cylindrical head screw, pressure head is fitted with pressing plate, compression spring is sleeved on stud, the both ends of compression spring respectively abut hexagon nut and pressing plate, so as to provide the elastic force when withdrawing for pressing plate.The utility model can reduce the oval deformation of workpiece, improve the assembly accuracy and integrity of workpiece, with better applicability and convenience.

Description

Technical Field

[0001] This utility model belongs to the field of thin-walled parts assembly technology, specifically relating to an end face positioning fixture for thin-walled parts. Background Technology

[0002] In the field of mechanical processing and installation, oil pump drive gears are thin-walled carburized parts, requiring specific standards for both the inner bore and teeth. The walls of the oil pump drive gear are very thin, with the thinnest part only 2.9mm thick. The rigidity of the oil pump drive gear is also very poor. In actual working conditions, when using a standard chuck on a CNC lathe to machine the inner bore of the oil pump drive gear, even with the clamping force adjusted to a minimum, tightening the chuck jaws will cause the part to exhibit noticeable ellipticity.

[0003] In summary, thin-walled parts, due to their thin walls and poor structural rigidity, are prone to deformation during clamping due to uneven clamping force or localized stress concentration. This is especially true during internal hole machining, where elliptical deformation is easily generated, severely affecting dimensional accuracy. Current CNC lathes mostly use standard three-jaw chucks to clamp workpieces, but the circumferential pressure generated by the radial clamping of the jaws can cause elastic deformation in thin-walled parts, resulting in insufficient roundness of the machined internal holes, which is insufficient to meet the requirements of high-precision machining. Therefore, existing fixtures for thin-walled parts still have shortcomings in terms of rapid clamping, repeatability, and workpiece surface protection. There is an urgent need for a versatile, precise, and effective fixture for thin-walled parts that can effectively reduce clamping deformation to meet the demands of high-precision machining. Utility Model Content

[0004] This utility model provides an end face positioning fixture for thin-walled parts, aiming to solve the current problem of how to provide a special fixture that is highly versatile, provides accurate positioning, and can effectively reduce the deformation of thin-walled parts during clamping, so as to meet the needs of high-precision machining.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides an end-face positioning fixture for thin-walled parts, including a double-ended stud, a hexagonal nut, a pressure plate, an adjusting support, a first internal hexagonal head screw, a pressure head, a compression spring, a base plate, a second internal hexagonal head screw, and a V-shaped support assembly, wherein:

[0007] The V-shaped support assembly is fixed to the base plate by a second internal hexagon head screw. The V-shaped support assembly can adapt to workpieces with different outer diameters. The pressure plate is connected to the base plate by a double-ended stud and an adjusting support. The pressure plate cooperates with the adjusting support and the double-ended stud to restrict the pressure plate to move only in the back-and-forth direction.

[0008] The pressure head is connected to the pressure plate via a first internal hexagonal head screw; the pressure head and the pressure plate fit together to press the workpiece to be installed; a compression spring is sleeved on a double-ended stud, and the two ends of the compression spring abut against the hexagonal nut and the pressure plate respectively, so as to provide elastic force for the pressure plate to retract.

[0009] In some embodiments, the upper end face of the base plate is provided with multiple sets of threaded holes for mounting the V-shaped support assembly, and the end face of the base plate is machined to form a workpiece end face positioning reference.

[0010] Furthermore, the threaded holes include three sets, which are evenly distributed.

[0011] In some embodiments, the V-shaped support assembly includes several V-shaped support members, each of which has a V-shaped opening that can adapt to the outer diameter of workpieces of different diameters.

[0012] In some embodiments, a T-shaped keyway is provided in the middle of the pressure plate, one end of the double-ended stud is cylindrical, and the head of the adjusting support is a hemispherical structure. The T-shaped keyway can cooperate with the head of the adjusting support and the cylindrical end of the double-ended stud to restrict the pressure plate to move only in the front-back direction.

[0013] Furthermore, the length of the T-keyway is matched with the front and rear positions of the adjustment support and the double-ended stud.

[0014] In some implementations, the pressure head is a stepped cylindrical structure and is independently detachable.

[0015] In some implementations, the arc-shaped head of the pressure plate matches the stepped cylindrical structure of the pressure head.

[0016] In some implementations, the direction of the spring force of the compression spring is coaxial with the direction of movement of the pressure plate.

[0017] In some implementations, hexagonal nuts are used to adjust the height of the studs and the support.

[0018] Compared with the prior art, the end face positioning fixture for thin-walled parts of this utility model has the following advantages:

[0019] This invention relates to an end-face positioning fixture for thin-walled parts. A V-shaped support assembly is fixed to the base plate via a second internal hexagonal head screw. Its V-shaped structure adapts to workpieces with different outer diameters, solving the problems of fixed opening angles and poor versatility of traditional V-blocks. It is compatible with thin-walled parts of various diameters, reducing the cost of custom-made fixtures. The pressure plate is connected to the base plate via a double-ended stud and an adjusting support, restricting its movement to only forward and backward. This prevents lateral swaying of the pressure plate, ensures a single direction of clamping force, reduces elliptical deformation of the workpiece due to uneven force, and improves the machining accuracy of the inner hole to meet certain standards. The pressure head fits the pressure plate; the stepped cylindrical pressure head cooperates with the arc-shaped pressure plate head, increasing the contact area, dispersing the clamping force, and preventing localized damage to the workpiece surface. A compression spring provides retraction force, and the automatic spring reset function simplifies the clamping process, improves loading and unloading efficiency, and prevents workpiece displacement due to human error. Traditional chuck clamping force can easily cause deformation of thin-walled parts. The cost of the clamps is high and their adaptability is poor. This utility model improves the versatility and ease of operation of the clamps by using the universality of the V-shaped support group, the one-way limiting of the pressure plate and the elastic reset mechanism, which reduces the risk of deformation and has good practical significance. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0021] Figure 1 This is a front view schematic diagram of the installation state of an end face positioning fixture for thin-walled parts according to the present invention;

[0022] Figure 2 This is a top view schematic diagram of the installation state of an end face positioning fixture for thin-walled parts according to the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the base plate in an end-face positioning fixture for thin-walled parts according to the present invention;

[0024] Figure 4 This is a schematic diagram of the V-shaped support structure in an end-face positioning fixture for thin-walled parts according to the present invention;

[0025] Figure 5 This is a schematic diagram of the pressure plate in an end-face positioning fixture for thin-walled parts according to the present invention.

[0026] Figure 6 This is a schematic diagram of the pressure head in an end-face positioning fixture for thin-walled parts according to the present invention;

[0027] Figure 7This is a schematic diagram of the structure of the adjustable support in the end face positioning fixture for thin-walled parts according to the present invention;

[0028] Figure 8 This is a schematic diagram of the double-headed stud in an end-face positioning fixture for thin-walled parts according to the present invention.

[0029] Among them, 1. Double-ended stud, 2. Hexagonal nut, 3. Pressure plate, 4. Adjustment support, 5. First internal hexagonal head screw, 6. Pressure head, 7. Compression spring, 8. Base plate, 9. Second internal hexagonal head screw, 10. V-shaped support, 11. Threaded hole, 12. T-shaped keyway. Detailed Implementation

[0030] 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 in various different configurations.

[0031] 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.

[0032] 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.

[0033] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the 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 on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] 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.

[0035] 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.

[0036] How to design a connection structure between the drive motor and the gearbox to ensure a perfect connection between the gearbox and the motor, while also ensuring the stability of the internal power transmission?

[0037] like Figure 1 and Figure 2 As shown, this utility model discloses an end-face positioning fixture for thin-walled parts, comprising a double-ended stud 1, a hexagonal nut 2, a pressure plate 3, an adjusting support 4, a first internal hexagonal head screw 5, a pressure head 6, a compression spring 7, a base plate 8, a second internal hexagonal head screw 9, and a V-shaped support assembly, wherein:

[0038] The V-shaped support assembly is fixed to the base plate 8 by the second internal hexagonal head screw 9. The V-shaped support assembly can adapt to workpieces with different outer diameters to be installed. The pressure plate 3 is connected to the base plate 8 by the double-ended stud 1 and the adjusting support 4. The pressure plate 3 cooperates with the adjusting support 4 and the double-ended stud 1 to restrict the pressure plate 3 to move only in the front and back direction.

[0039] The pressure head 6 is connected to the pressure plate 3 via the first internal hexagonal head screw 5; the pressure head 6 fits into the pressure plate 3 to press the workpiece to be installed; the compression spring 7 is sleeved on the double-ended stud 1, and the two ends of the compression spring 7 abut against the hexagonal nut 2 and the pressure plate 3 respectively, so as to provide the spring force for the pressure plate 3 to retract.

[0040] This utility model is used in an end-face positioning fixture for thin-walled parts. The V-shaped support group is fixed to the base plate 8 by the second internal hexagonal head screw 9, and can adapt to workpieces with different outer diameters, enhancing the versatility of the fixture for workpieces of different specifications. The pressure plate 3 is connected to the base plate 8 by means of the double-ended stud 1 and the adjusting support 4. With the cooperation of the two, the pressure plate 3 can move only in the front-back direction, ensuring the positioning accuracy. The pressure head 6 is connected to the pressure plate 3 by the first internal hexagonal head screw 9 and fits well, which can effectively press the workpiece to be installed. The compression spring 7 is sleeved on the double-ended stud 1, with its two ends abutting against the hexagonal nut 2 and the pressure plate 3 respectively, providing elasticity for the pressure plate 3 to retract, facilitating the loading and unloading of workpieces and improving the ease of use.

[0041] In some preferred embodiments, the bottom plate of this utility model is precision machined at the 8 end faces as a positioning reference, and three sets of threaded holes are evenly distributed; the precision machined end faces ensure the fit accuracy of the workpiece end faces and reduce clamping errors; the evenly distributed threaded holes enhance the installation stability of the V-shaped support group and adapt to the symmetrical support requirements of different workpiece outer diameters.

[0042] The V-shaped support 10 of this utility model has V-shaped openings that can be adapted to different diameters to form symmetrical clamping, which further improves the stability of the workpiece outer circle positioning.

[0043] Furthermore, the T-shaped keyway 12 of this utility model is precisely matched with the adjusting support 4 and the double-headed stud 1, and the length of the T-shaped keyway 12 matches the front and rear positions; in this way, the pressure plate 3 is limited to moving only in the front and rear, avoiding the deviation of the clamping force caused by the left and right offset.

[0044] The pressure head 6 of this invention is an independent, detachable stepped cylindrical structure that fits into the arc-shaped head of the pressure plate 3. In actual working conditions, a copper pressure head 6 can be used to reduce indentations on the workpiece surface, and the stepped structure enhances the stability of the clamping contact; the detachable design facilitates the replacement of worn parts and reduces maintenance costs.

[0045] Furthermore, the compression spring 7 of this invention has its elastic force direction coaxial with the movement of the pressure plate; the hexagonal nut 2 adjusts the height of the double-ended stud 1 and the adjustable support 4. Through the coaxial design of the compression spring 7, this invention avoids lateral force interference with the movement of the pressure plate 3 to a certain extent; combined with the hexagonal nut 2, it adapts to different workpiece thicknesses, improving the adaptability of the fixture.

[0046] The following detailed description of an end-face positioning fixture for thin-walled parts according to specific embodiments further illustrates this invention.

[0047] The end face positioning fixture of this utility model is composed of the following components: a double-ended stud 1, a hexagonal nut 2, a pressure plate 3, an adjusting support 4, a first internal hexagonal head screw 5, a pressure head 6, a compression spring 7, a base plate 8, a second internal hexagonal head screw 9, a V-shaped support 10, a threaded hole 11, and a T-shaped keyway 12.

[0048] like Figure 3 As shown, three sets of threaded holes 11 are evenly distributed on the plane of the base plate 8 of this utility model. The three sets of threaded holes 11 are used to install the V-shaped support 10. The end face of the base plate 8 is precision machined for positioning the end face of the workpiece.

[0049] like Figure 4 As shown, the V-shaped support 10 of this utility model is designed with a V-shaped structure, which is highly adaptable and can be applied to parts with different outer circles, and has good versatility.

[0050] like Figure 5 As shown, the head of the pressure plate 3 of this utility model is designed with an arc-shaped structure, which matches the shape of the pressure head 6 to avoid bumping the workpiece.

[0051] Furthermore, the pressure plate 3 of this utility model has a T-shaped keyway 12 with a T-shaped structure in the middle. The length of the T-shaped keyway 12 matches the front and rear positions of the adjusting support 4 and the double-headed stud 1. When the pressure plate 3 moves back and forth, it can ensure that the pressure point position is appropriate and the workpiece is pressed, and it can also completely retract from the workpiece to ensure that the workpiece is clamped and loaded smoothly.

[0052] The T-shaped keyway 12 of this utility model needs to be precision machined. It works in conjunction with the adjusting support 4 and the double-headed stud 1 to restrict the left and right swing of the pressure plate 3, so that it can only move back and forth.

[0053] like Figure 6 As shown, in some working conditions, the pressure head 6 of this invention is made of copper and is shaped like a stepped cylinder. It cooperates with the pressure plate 3 to press the workpiece firmly, preventing damage. The pressure head 6 is easily damaged, and its independent structure allows for quick replacement.

[0054] like Figure 7 As shown, the head of the adjustment support 4 of this utility model adopts a hemispherical structure, and the spherical part and the upper cylinder are precision machined to fit with the keyway of the pressure plate 3.

[0055] like Figure 8 As shown, one end of the double-headed stud 1 of this utility model is a cylindrical part that is precision machined and fits into the keyway of the pressure plate 3.

[0056] The V-shaped support 10 of this utility model is connected to the base plate 8 by a second internal hexagonal head screw 9.

[0057] The pressure plate 3 of this invention is connected to the base plate 8 via a double-ended stud 1 and an adjusting support 4; simultaneously, the height of the double-ended stud 1 and the adjusting support 4 is adjusted via a hexagonal nut 2. The other end of the adjusting support 4 extends into the T-shaped keyway 12 of the pressure plate 3 and engages with it. The other end of the double-ended stud 1 passes through the T-shaped keyway 12 of the pressure plate 3 and is connected to the pressure plate 3 via the hexagonal nut 2; a compression spring 7 passes through the double-ended stud 1, with one end contacting the hexagonal nut 2 and the other end contacting the pressure plate 3.

[0058] The outer circle of the small step of the pressure head 6 mates with the inner hole of the pressure plate 3, and is connected to the pressure plate 3 by an internal hexagon head screw 5. The positions where the double-ended stud 1 and the adjusting support 4 mate with the pressure plate 3 are precision machined to reduce clearance, ensuring that the pressure plate 3 can only move back and forth along the direction restricted by the double-ended stud 1 and the adjusting support 4, and cannot swing left or right. This achieves consistency in the repeated pressing and unpressing actions of the pressure plate 3, facilitating workpiece loading and unloading.

[0059] In actual working conditions, when using the fixture, first correct the runout of the three jaws of the standard chuck, then install the entire fixture inside the jaws of the standard chuck of the CNC lathe, and correct the fixture by correcting the runout of the outer circle of the base plate 8.

[0060] After the fixture is properly aligned, first loosen the hexagonal nut 2. The pressure plate 3 moves outward under the force of the compression spring 7, moving the pressure head 6 away from the end face of the fixture. Simultaneously, the pressure plate 3 moves outward along the direction limited by the double-ended stud 1 and the adjusting support 4, away from the center of the fixture. Next, place the workpiece on the V-shaped support 10, ensuring one end face of the workpiece is flush with the end face of the base plate 8. Finally, push the pressure plate 3 towards the workpiece until it reaches its limit position and stops. Rotate the hexagonal nut 2, causing the pressure plate 3 to drive the pressure head 6 to press the workpiece down, just enough to achieve initial positioning. Next, align the workpiece. Use a dial indicator to measure the runout of the workpiece's inner hole. The indicator holder is attached to the machine tool cutter head. Rotate the workpiece and measure the runout value to determine the direction and amount of workpiece offset. Tap the workpiece with a copper rod to remeasure the runout. Repeat this process several times until the runout meets the machining requirements. Tighten the hexagonal nut 2, causing the pressure plate 3 to drive the pressure head 6 to press the workpiece down, thus completing the workpiece installation.

[0061] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model according to the description and above. However, any modifications, alterations, or equivalent changes made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or evolutions made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A face positioning fixture for thin-walled parts, characterized in that, Includes a double-ended stud (1), a hexagonal nut (2), a pressure plate (3), an adjusting support (4), a first internal hexagonal head screw (5), a pressure head (6), a compression spring (7), a base plate (8), a second internal hexagonal head screw (9), and a V-shaped support assembly, wherein: The V-shaped support assembly is fixed to the base plate (8) by a second internal hexagonal head screw (9). The V-shaped support assembly can adapt to workpieces with different outer diameters. The pressure plate (3) is connected to the base plate (8) by a double-ended stud (1) and an adjusting support (4). The pressure plate (3) cooperates with the adjusting support (4) and the double-ended stud (1) to restrict the pressure plate (3) to move only in the front-back direction. The pressure head (6) is connected to the pressure plate (3) by a first internal hexagonal head screw (5); the pressure head (6) fits into the pressure plate (3) to press the workpiece to be installed; the compression spring (7) is sleeved on the double-ended stud (1), and the two ends of the compression spring (7) abut against the hexagonal nut (2) and the pressure plate (3) respectively, so as to provide the pressure plate (3) with the elastic force when it is retracted.

2. The end face positioning fixture for thin-walled parts according to claim 1, characterized in that, The upper surface of the base plate (8) is provided with multiple sets of threaded holes (11) for installing V-shaped support groups. The end face of the base plate (8) is formed into a workpiece end face positioning reference by machining.

3. The end face positioning fixture for thin-walled parts according to claim 2, characterized in that, The threaded holes (11) include three sets, and the three sets of threaded holes (11) are evenly distributed.

4. The end face positioning fixture for thin-walled parts according to claim 1, characterized in that, The V-shaped support group includes several V-shaped support members (10), each of which has a V-shaped opening that can adapt to the outer circle of workpieces with different diameters.

5. The end face positioning fixture for thin-walled parts according to claim 1, characterized in that, The pressure plate (3) is provided with a T-shaped keyway (12) in the middle position. One end of the double-headed stud (1) is cylindrical. The head of the adjusting support (4) is a hemispherical structure. The T-shaped keyway (12) can cooperate with the head of the adjusting support (4) and the cylindrical end of the double-headed stud (1) so as to restrict the pressure plate (3) to move only in the front and back direction.

6. The end face positioning fixture for thin-walled parts according to claim 5, characterized in that, The length of the T-shaped keyway (12) matches the front and rear positions of the adjusting support (4) and the double-ended stud (1).

7. The end face positioning fixture for thin-walled parts according to claim 1, characterized in that, The pressure head (6) is a stepped cylindrical structure and is independently detachable.

8. The end face positioning fixture for thin-walled parts according to claim 1, characterized in that, The arc-shaped head of the pressure plate (3) matches the stepped cylindrical structure of the pressure head (6).

9. The end face positioning fixture for thin-walled parts according to claim 1, characterized in that, The direction of the spring force of the compression spring (7) is coaxial with the direction of movement of the pressure plate (3).

10. The end face positioning fixture for thin-walled parts according to claim 1, characterized in that, The hexagonal nut (2) is used to adjust the height of the double-ended stud (1) and the adjusting support (4).

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