General hydraulic fixture for high-precision numerical control lathe

Abstract

The utility model discloses a general type hydraulic clamp of high accuracy numerical control lathe can adapt to all kinds of workpieces such as thin wall, thick wall, solid, irregular, and general performance is strong, and can guarantee accuracy, rigidity, it includes coaxial chuck module, oil circuit connecting piece, clamp body and hydraulic piston, the axis of oil circuit connecting piece is equipped with first oil circuit, and its lateral surface is equipped with hydraulic oil filling hole that communicates with first oil circuit, one end of clamp body is fixedly connected with oil circuit connecting piece, and its axis is equipped with piston channel that communicates with first oil circuit, one end of hydraulic piston is equipped with piston rod that cooperates in piston channel of dynamic sealing, chuck module includes the elastic inner chuck and rigid outer chuck of coaxial oil circuit connecting piece, inner chuck is fixedly connected with oil circuit connecting piece, and is equipped with second oil circuit that communicates with first oil circuit, and second oil circuit communicates to the circumference of inner chuck, outer chuck fixedly sleeve connects in the circumference of inner chuck, and the end face, circumference of inner chuck and outer chuck all are equipped with first sealing ring.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic clamping technology, and specifically refers to a general-purpose hydraulic clamping fixture for high-precision CNC lathes. Background Technology

[0002] A hydraulic chuck is a clamping device used on machine tools (such as lathes, milling machines, and drilling machines). It utilizes a hydraulic system to clamp or release workpieces, providing a fast, efficient, and precise way to fix workpieces for machining. Hydraulic chucks are particularly suitable for applications requiring frequent workpiece changes because they can quickly clamp and release, reducing downtime and increasing production efficiency. The working principle of a hydraulic chuck is that a hydraulic pump generates pressure, which is transmitted to a piston inside the chuck. The piston pushes the jaws to move, thus clamping or releasing the workpiece. A chuck typically consists of multiple jaws that can rotate around a central point to accommodate workpieces of different sizes and shapes. Similar hydraulic clamps include hydraulic collets, which can respectively achieve external and internal clamping of workpieces.

[0003] However, as modern industry demands increasingly higher precision from workpieces, and as the volume and thickness of some workpieces are constantly being compressed and reduced, traditional standard hydraulic chucks and hydraulic collets are prone to uncontrollable deformation of thin-walled workpieces due to inaccurate force control when clamping them, resulting in defective products. Furthermore, debris generated during processing can easily enter the gaps between the components of the hydraulic chuck and hydraulic collet, causing the fixture to be scrapped. Utility Model Content

[0004] The main purpose of this utility model is to provide a general-purpose hydraulic fixture for high-precision CNC lathes, which solves the problems existing in the prior art. It can adapt to various workpieces such as thin-walled, thick-walled, solid, and irregular, and has strong versatility while ensuring accuracy and rigidity.

[0005] To achieve the above objectives, the solution of this utility model is:

[0006] A general-purpose hydraulic fixture for a high-precision CNC lathe includes a chuck module, an oil circuit connector, a fixture body, and a hydraulic piston arranged coaxially. The oil circuit connector has a first oil circuit on its axis and a hydraulic oil filling hole communicating with the first oil circuit on its side. One end of the fixture body is fixedly connected to the oil circuit connector, and a piston channel is provided on its axis, communicating with the first oil circuit. The other end of the fixture body is connected to the machine tool spindle. One end of the hydraulic piston has a piston rod that dynamically seals within the piston channel. One end is connected to the rotary cylinder of the machine tool; the chuck module includes an inner chuck and an outer chuck coaxially arranged with the oil circuit connector, the inner chuck and the outer chuck being made of rigid material and elastic material respectively; the inner chuck is fixedly connected to the oil circuit connector and is provided with a second oil circuit communicating with the first oil circuit, the second oil circuit communicating to the circumferential surface of the inner chuck; the outer chuck is fixedly sleeved on the circumferential surface of the inner chuck; a first sealing ring is provided between the end face and circumferential surface of the inner chuck and the outer chuck, so that an oil cavity communicating with the second oil circuit is formed between the two.

[0007] The general-purpose hydraulic clamp uses several screws that pass through the outer clamp, inner clamp, and oil circuit connector and are threadedly connected to the clamp body to achieve clamp assembly.

[0008] The end face of the oil circuit connector is provided with a circular limiting ring groove, and the end face of the outer clamp is embedded in the limiting ring groove.

[0009] The hydraulic oil filling holes are designed to be several in number and are arranged at equal angular intervals around the axis of the oil circuit connector.

[0010] The oil circuit connector and the end face of the fixture body are provided with a piston through hole that connects to the piston channel. The piston through hole and the piston channel are coaxially arranged and have the same radius. The piston rod reciprocates between the piston channel and the piston through hole in a dynamically sealed manner.

[0011] A second sealing ring is provided between the oil passage connector and the opposing surface of the inner clamp, and the second sealing ring surrounds the first oil passage.

[0012] The piston rod is provided with several third sealing rings on its circumferential surface.

[0013] The other end of the hydraulic piston is provided with an internal thread for the output end of the rotary cylinder to be threaded.

[0014] The general-purpose hydraulic fixture for the high-precision CNC lathe also includes a flange at the other end of the fixture body for connecting the machine tool spindle.

[0015] After adopting the above technical solution, the present invention has the following technical effects:

[0016] This invention utilizes Pascal's Law, abandoning the existing welding sealing method, and innovatively adopts mechanical connection of various components in conjunction with a first sealing ring to achieve sealing. The machine tool's rotary cylinder drives a hydraulic piston to extend and retract within the piston channel, generating corresponding thrust. When the hydraulic piston pushes the hydraulic oil in the first oil circuit to the second oil circuit, the amount of hydraulic oil in the oil chamber increases, causing the outer chuck to expand and deform under pressure, thereby outputting force to clamp the workpiece. The chuck module, composed of the inner and outer chucks, adopts a modular design and can be replaced and installed independently of the oil circuit connectors. This allows the same machine tool to be used to process different types of workpieces. Different clamping forces can be output according to the shape combination of the inner and outer chucks, thus fixing workpieces of different shapes, resulting in higher versatility. The hydraulic oil volume in the first oil circuit can be adjusted through the hydraulic oil filling hole, thereby adjusting the output clamping pressure in conjunction with the power of the hydraulic piston, ensuring accuracy and rigidity. Attached Figure Description

[0017] Figure 1 This is a perspective view of a specific embodiment of the present utility model.

[0018] Figure 2 This is an exploded view of a specific embodiment of the present utility model.

[0019] Figure 3 This is a cross-sectional view of a specific embodiment of the present utility model.

[0020] Explanation of icon numbers:

[0021] 1-Oil circuit connector; 11-First oil circuit; 12-Hydraulic oil filling hole; 13-Limiting ring groove; 14-Piston through hole; 2-Clamp body; 21-Piston channel; 3-Hydraulic piston; 31-Piston rod; 32-Internal thread; 4-Inner clamp; 41-Second oil circuit; 5-Outer clamp; 6-First sealing ring; 7-Second sealing ring; 8-Third sealing ring; 9-Flange; a-Oil chamber. Detailed Implementation

[0022] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0023] refer to Figure 1-3 As shown, this utility model discloses a general-purpose hydraulic fixture for a high-precision CNC lathe, including a chuck module, an oil circuit connector 1, a fixture body 2, and a hydraulic piston 3 arranged coaxially;

[0024] The oil circuit connector 1 has a first oil circuit 11 on its axis and a hydraulic oil filling hole 12 connected to the first oil circuit 11 on its side.

[0025] One end of the fixture body 2 is fixedly connected to the oil circuit connector 1, and a piston channel 21 is provided on its axis, which is connected to the first oil circuit 11; the other end of the fixture body 2 is connected to the spindle of the machine tool.

[0026] One end of the hydraulic piston 3 is provided with a piston rod 31 that is dynamically sealed in the piston channel 21, and the other end is connected to the rotary cylinder of the machine tool.

[0027] The chuck module includes an inner chuck 4 and an outer chuck 5 coaxially arranged with the oil circuit connector 1. The inner chuck 4 and the outer chuck 5 are made of rigid material and elastic material, respectively. The inner chuck 4 is fixedly connected to the oil circuit connector 1 and is provided with a second oil circuit 41 that communicates with the first oil circuit 11. The second oil circuit 41 communicates with the circumferential surface of the inner chuck 4. The outer chuck 5 is fixedly sleeved on the circumferential surface of the inner chuck 4. A first sealing ring 6 is provided between the end face and circumferential surface of the inner chuck 4 and the outer chuck 5, so that an oil cavity a communicating with the second oil circuit 41 is formed between the two.

[0028] Through the above scheme, this utility model utilizes Pascal's law, abandoning the welding sealing method of the existing technology, and innovatively adopts mechanical connection of each component and cooperates with the first sealing ring 6 to achieve sealing. The hydraulic piston 3 is driven by the rotary cylinder of the machine tool to move telescopically in the piston channel 21, generating a corresponding thrust. When the hydraulic piston 3 pushes the hydraulic oil in the first oil circuit 11 to the second oil circuit 41, the hydraulic oil in the oil chamber a increases, thereby causing the outer chuck 5 to expand and deform under pressure, thereby outputting force to clamp the workpiece. The chuck module composed of the inner chuck 4 and the outer chuck 5 adopts a modular design and can be replaced and installed independently of the oil circuit connector 1, so that the same machine tool can be used to process different types of workpieces. According to the shape combination of the inner chuck 4 and the outer chuck 5, different clamping forces can be output to fix workpieces of different shapes, thus improving versatility. The hydraulic oil filling hole 12 can be used to adjust the amount of hydraulic oil in the first oil circuit 11, thereby cooperating with the power adjustment of the hydraulic piston 3 to adjust the output clamping pressure, ensuring accuracy and rigidity.

[0029] The following are specific embodiments of the present invention.

[0030] The rigid material of the inner clamp 4 is a hard metal material, such as stainless steel; the elastic material of the outer clamp 5 is rubber, which can produce a certain deformation when subjected to hydraulic pressure.

[0031] The aforementioned general-purpose hydraulic clamp is assembled by several screws passing through the outer clamp 5, the inner clamp 4, and the oil circuit connector 1 and being threadedly connected to the clamp body 2. This ensures that the outer clamp 5 and the inner clamp 4 will not wobble or move in the axial direction of the oil circuit connector 1.

[0032] The end face of the aforementioned oil circuit connector 1 is provided with a circular limiting ring groove 13. The end face of the outer clamp 5 is embedded in the limiting ring groove 13, which can limit the end face of the outer clamp 5 so that it will not be dislodged from the position of the limiting ring groove 13 due to hydraulic pressure. Only the two ends of the outer clamp 5 will deform due to hydraulic pressure.

[0033] The hydraulic oil filling holes 12 are designed to be several in number and are arranged at equal angular intervals around the axis of the oil circuit connector 1.

[0034] The end faces of the aforementioned oil circuit connector 1 and the fixture body 2 are provided with piston through holes 14 that connect with the piston channel 21. The piston through holes 14 and the piston channel 21 are coaxially arranged and have the same radius. The piston rod 31 reciprocates between the piston channel 21 and the piston through hole 14 in a dynamically sealed manner. When the piston rod 31 is inserted into the piston through hole 14, the internal space of the oil circuit connector 1 is more easily compressed, thus making it easier to push the hydraulic oil to flow.

[0035] A second sealing ring 7 is provided between the opposite surfaces of the oil circuit connector 1 and the inner clamp 4, and the second sealing ring 7 surrounds the first oil circuit 11.

[0036] The piston rod 31 is provided with several third sealing rings 8 on its circumferential surface.

[0037] The other end of the aforementioned hydraulic piston 3 is provided with an internal thread 32 for threaded connection of the output end of the rotary cylinder.

[0038] This utility model also includes a flange 9 disposed at the other end of the fixture body 2 for connecting the spindle of the machine tool.

[0039] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A general-purpose hydraulic clamp for a high-precision CNC lathe, characterized in that: Includes a coaxially mounted chuck module, hydraulic connector, clamp body, and hydraulic piston; The oil circuit connector has a first oil circuit on its axis and a hydraulic oil filling hole connected to the first oil circuit on its side. One end of the fixture body is fixedly connected to the oil circuit connector, and a piston channel is provided on its axis, which communicates with the first oil circuit; the other end of the fixture body is connected to the spindle of the machine tool. One end of the hydraulic piston is provided with a piston rod that is dynamically sealed and fits in the piston channel, and the other end is connected to the rotary cylinder of the machine tool. The chuck module includes an inner chuck and an outer chuck coaxially arranged with the oil circuit connector. The inner chuck and the outer chuck are made of rigid material and elastic material, respectively. The inner chuck is fixedly connected to the oil circuit connector and is provided with a second oil circuit communicating with the first oil circuit. The second oil circuit communicates with the circumferential surface of the inner chuck. The outer chuck is fixedly sleeved on the circumferential surface of the inner chuck. A first sealing ring is provided between the end face and circumferential surface of the inner chuck and the outer chuck to form an oil cavity communicating with the second oil circuit.

2. The universal hydraulic fixture for a high-precision CNC lathe as described in claim 1, characterized in that: The general-purpose hydraulic clamp uses several screws that pass through the outer clamp, inner clamp, and oil circuit connector and are threadedly connected to the clamp body to achieve clamp assembly.

3. The universal hydraulic fixture for a high-precision CNC lathe as described in claim 1, characterized in that: The end face of the oil circuit connector is provided with a circular limiting ring groove, and the end face of the outer clamp is embedded in the limiting ring groove.

4. The universal hydraulic fixture for a high-precision CNC lathe as described in claim 1, characterized in that: The hydraulic oil filling holes are designed to be several in number and are arranged at equal angular intervals around the axis of the oil circuit connector.

5. The universal hydraulic fixture for a high-precision CNC lathe as described in claim 1, characterized in that: The oil circuit connector and the end face of the fixture body are provided with a piston through hole that connects to the piston channel. The piston through hole and the piston channel are coaxially arranged and have the same radius. The piston rod reciprocates between the piston channel and the piston through hole in a dynamically sealed manner.

6. The universal hydraulic fixture for a high-precision CNC lathe as described in claim 1, characterized in that: A second sealing ring is provided between the oil passage connector and the opposing surface of the inner clamp, and the second sealing ring surrounds the first oil passage.

7. The universal hydraulic fixture for a high-precision CNC lathe as described in claim 1, characterized in that: The piston rod is provided with several third sealing rings on its circumferential surface.

8. The universal hydraulic fixture for a high-precision CNC lathe as described in claim 1, characterized in that: The other end of the hydraulic piston is provided with an internal thread for the output end of the rotary cylinder to be threaded.

9. The universal hydraulic fixture for a high-precision CNC lathe as described in claim 1, characterized in that: It also includes a flange located at the other end of the fixture body for connecting the machine tool spindle.

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