Clamp for clamping frame type workpieces with high hole precision

Abstract

The utility model relates to the technical field of workpiece fixtures, and discloses a fixture for clamping frame type workpieces with high hole precision, which comprises a bottom plate, a base is mounted at the top of the bottom plate, a through hole is formed in the middle of the base, a positioning disc is arranged at the top of the base, and an expansion sleeve is mounted on the top of the base and on the inner side of the positioning disc. The top of the expansion sleeve extends to the position above the positioning disc, a pull rod is movably arranged on the inner side of the expansion sleeve, a plurality of rotating air cylinders are installed at the position, outside the base, of the top of the bottom plate, an oil cylinder is installed at the bottom of the bottom plate, pressing plates are installed at the output ends of the rotating air cylinders, and the bottom of the pull rod penetrates through the through hole and the bottom plate and then is connected to the output end of the oil cylinder. The machine tool oil cylinder drives the pull rod to move downwards, the expansion sleeve is promoted to transversely expand a workpiece, the workpiece is clamped and fixed, missing teeth on the expansion sleeve are matched with short teeth at a spline of the workpiece, the consistency of clamping positions is guaranteed, meanwhile, the workpiece is effectively prevented from rotating, and the machining precision of side holes is improved.

Description

Technical Field

[0001] This utility model relates to the field of workpiece clamping technology, specifically a clamping fixture for clamping frame-type workpieces with high hole precision. Background Technology

[0002] Frame-type components typically refer to frame structures used in the mechanical, architectural, or manufacturing fields as supporting structures or to bear other components. Frame-type components are important in a variety of applications because they provide structural stability and functionality.

[0003] Frame-type workpieces (such as cylindrical workpieces) need to be clamped and fixed by fixtures during processing. However, existing fixtures are not effective at clamping cylindrical workpieces. The workpieces tend to rotate when machining side holes, which reduces the machining accuracy of the side holes and urgently needs to be improved. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the clamping effect of existing frame-type workpiece clamps is not good, and the workpiece is prone to rotation when machining the edge holes, which reduces the machining accuracy of the edge holes.

[0005] To solve the above problems, the technical solution of this utility model is as follows: a clamping fixture for clamping frame-type workpieces with high hole precision, including a base plate, a base mounted on the top of the base plate, a through hole in the middle of the base plate, and a positioning plate on the top of the base plate, an expansion sleeve mounted on the top of the base plate inside the positioning plate, the top of the expansion sleeve extending above the positioning plate, and a pull rod movably mounted on its inner side, the pull rod causing the end of the expansion sleeve to expand when it moves downward, a plurality of rotary cylinders mounted on the top of the base plate outside the base plate, and a hydraulic cylinder mounted on the bottom, a pressure plate mounted on the output end of the rotary cylinder, and the bottom of the pull rod passing through the through hole and the base plate and connected to the output end of the hydraulic cylinder.

[0006] Furthermore, the upper side of the expansion sleeve is provided with missing teeth, and the spline inside the workpiece is provided with a short tooth protruding outward to ensure consistent clamping position each time.

[0007] Furthermore, the top of the pull rod is a truncated cone that is wider at the top and narrower at the bottom, and a vertical rod is fixed to the bottom of the truncated cone.

[0008] Furthermore, the bottom of the vertical rod is threaded and is threadedly connected to the output end of the hydraulic cylinder.

[0009] Furthermore, there are four rotary cylinders, which are arranged in a circular array around the base.

[0010] The advantages of this utility model compared with the existing technology are as follows: The machine tool cylinder drives the pull rod to move downward, causing the expansion sleeve to tighten the workpiece laterally, thereby achieving the clamping and fixing of the workpiece. By using the missing teeth on the expansion sleeve to cooperate with the short teeth at the spline of the workpiece, the consistency of the clamping position is ensured, and the workpiece is effectively prevented from rotating, thus improving the machining accuracy of the edge holes. Attached Figure Description

[0011] Figure 1 This is a top view of the present invention.

[0012] Figure 2 This is a cross-sectional view of the present invention.

[0013] As shown in the figure: 1. Base plate; 2. Base; 3. Positioning plate; 4. Expansion sleeve; 5. Tie rod; 6. Rotary cylinder; 7. Hydraulic cylinder. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0015] like Figures 1 to 2 As shown, a clamping fixture for clamping frame-type workpieces with high hole precision includes a base plate 1, a base 2 mounted on the top of the base plate 1, a through hole in the middle of the base 2, and a positioning plate 3 on its top. An expansion sleeve 4 is mounted on the top of the base 2 inside the positioning plate 3. The top of the expansion sleeve 4 extends above the positioning plate 3, and a pull rod 5 is movably mounted on its inner side. The top of the pull rod 5 is a truncated cone with a larger top and a smaller bottom. A vertical rod is fixed to the bottom of the truncated cone. Four rotary cylinders 6 are mounted on the top of the base plate 1 outside the base 2, and hydraulic cylinders 7 are mounted on the bottom. A pressure plate is mounted on the output end of the rotary cylinders 6. The four rotary cylinders 6 are arranged in a circular array around the base 2. The bottom of the vertical rod is threaded and passes through the through hole and the base plate 1 before connecting to the output end of the hydraulic cylinder 7.

[0016] The upper side of the expansion sleeve 4 has a missing tooth, and the internal spline of the workpiece has a short tooth protruding outward to ensure consistent clamping position each time. The expansion sleeve 4 mates with the internal spline of the workpiece to ensure a zero-clearance fit between the workpiece and the expansion sleeve, thereby improving the positional accuracy of the workpiece's edge hole and internal spline.

[0017] In practical use, the workpiece is placed on the expansion sleeve 4 during operation, and the switch of the rotary cylinder 6 is closed. The rotary cylinder 6 drives the pressure plate to rotate, and the workpiece is fixed to the end face of the positioning plate 3 through the pressure plate. The machine tool is turned on, and the pull rod 5 will move downward under the pulling force of the machine tool cylinder 7, thereby driving the expansion sleeve 4 to stretch the workpiece laterally. At this time, the workpiece clamping is completed. The edge hole of the workpiece is machined. After the machining is completed, the machine tool cylinder 7 is released, the pull rod 5 moves upward, and the expansion sleeve 4 is released. At this time, the switch of the rotary cylinder 6 is turned on, so that the pressure plate moves away from the workpiece. The workpiece is then removed, and one machining cycle is completed.

[0018] The parts not disclosed in this utility model are all prior art, and their specific structures and working principles will not be described in detail.

[0019] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0021] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A clamping fixture for mounting frame-type workpieces with high hole precision, characterized in that: Includes a base plate (1), a base (2) is installed on the top of the base plate (1), the base (2) has a through hole in the middle and a positioning plate (3) is provided on its top, an expansion sleeve (4) is installed on the top of the base (2) inside the positioning plate (3), the top of the expansion sleeve (4) extends to the top of the positioning plate (3) and a pull rod (5) is movably provided on its inner side, the pull rod (5) causes the end of the expansion sleeve (4) to expand when it moves downward, multiple rotary cylinders (6) are installed on the top of the base plate (1) outside the base (2) and a hydraulic cylinder (7) is installed at the bottom, a pressure plate is installed at the output end of the rotary cylinder (6), and the bottom of the pull rod (5) passes through the through hole and the base plate (1) and is connected to the output end of the hydraulic cylinder (7).

2. The fixture for clamping frame-type workpieces with high hole precision according to claim 1, characterized in that: The expansion sleeve (4) has missing teeth on the upper side.

3. The clamping fixture for mounting frame-type workpieces with high hole precision according to claim 1, characterized in that: The top of the pull rod (5) is a truncated cone with a larger top and a smaller bottom, and a vertical rod is fixed to the bottom of the truncated cone.

4. The fixture for clamping frame-type workpieces with high hole precision according to claim 3, characterized in that: The bottom of the vertical rod is threaded and is threaded to the output end of the oil cylinder (7).

5. The clamping fixture for mounting frame-type workpieces with high hole precision according to claim 1, characterized in that: The rotary cylinder (6) is provided in four parts and is arranged in a ring array around the base (2).

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