Machine tool clamp with ejector sleeve

Abstract

A machine tool clamp with a needle sleeve, comprising a machine tool spindle, the front end of the machine tool spindle is provided with a chuck, the front end of the chuck is provided with a chuck jaw, the chuck is provided with a needle sleeve structure, the needle sleeve structure comprises a first sleeve, the first sleeve is fixedly connected with the chuck, the first sleeve is coaxially arranged with the machine tool spindle, the rear end of the first sleeve is coaxially fixedly connected with a second sleeve, the rear end of the second sleeve is provided with a limiting ring on the inner side, the second sleeve is provided with a needle, the needle and the second sleeve form a sliding pair parallel to the axial direction, and the front end of the needle is provided with a needle tip. The utility model discloses a needle sleeve structure is arranged in the chuck, when the workpiece is inserted into the inside of the chuck, the center hole of the spline shaft workpiece is matched with the needle, so that the clamping and positioning precision of the spline shaft workpiece is improved, and it is especially suitable for long spline shafts, and the consistency of machining is ensured.

Description

Technical Field

[0001] This utility model relates to the field of machinery, and more particularly to tooling fixtures, especially a machine tool fixture with a pin sleeve. Background Technology

[0002] Machine tools are used to perform machining on workpieces. In the prior art, when machining a splined shaft, the splined shaft needs to be installed in a chuck first, and then the splined shaft is clamped and fixed by jaws. However, when machining a long splined shaft, since the rear end of the splined shaft extends into the machine tool spindle and chuck, the jaws hold the front end of the splined shaft, and there may be metal chips adhering to the clamping surface. This causes the splined shaft to tilt after the jaws clamp it, resulting in low coaxiality of the splined shaft, which in turn leads to deviations in the dimensional accuracy of the workpiece. Utility Model Content

[0003] The purpose of this utility model is to provide a machine tool fixture with a pin sleeve to solve the technical problem of low clamping accuracy when holding long splined shafts in existing machine tool fixtures.

[0004] This utility model provides a machine tool fixture with a ejector sleeve, including a machine tool spindle, a chuck at the front end of the machine tool spindle, jaws at the front end of the chuck, an ejector sleeve structure in the chuck, the ejector sleeve structure including a first sleeve, the first sleeve being fixedly connected to the chuck and coaxially arranged with the machine tool spindle, a second sleeve being coaxially fixedly connected to the rear end of the first sleeve, a limit ring being provided on the inner side of the rear end of the second sleeve, an ejector pin being provided in the second sleeve, the ejector pin and the second sleeve forming a sliding pair parallel to the axial direction of the second sleeve, the front end of the ejector pin being provided with a needle tip, a connecting post coaxially arranged at the rear end of the ejector pin, the diameter of the connecting post being smaller than the diameter of the ejector pin, the connecting post being arranged in the limit ring, a spring being sleeved on the connecting post, the spring being arranged between the ejector pin and the limit ring, a limit structure being connected to the rear side of the connecting post, the limit structure being located behind the second sleeve, and a limit switch cooperating with the limit structure being provided in the machine tool spindle.

[0005] Preferably, the outer periphery of the first sleeve is provided with a first mounting plate, and the first sleeve is fixedly connected to the chuck by the first mounting plate and bolts.

[0006] Preferably, the second sleeve is provided with a second mounting plate on its outer periphery, and the second sleeve is fixedly connected to the first sleeve by the second mounting plate and bolts.

[0007] Preferably, the limiting structure includes a threaded hole provided on the rear end face of the ejector pin, a screw is threaded into the threaded hole, the head of the screw is located behind the second sleeve, and the outer diameter of the screw head is larger than the inner diameter of the limiting ring.

[0008] Compared with the prior art, the advantages of this invention are positive and significant. This invention incorporates a ejector sleeve structure within the chuck. When the workpiece is inserted into the chuck, the ejector pin engages with the center hole of the splined shaft workpiece, thereby improving the clamping and positioning accuracy of the splined shaft workpiece. This is particularly suitable for longer splined shafts, ensuring consistent machining. Furthermore, a limit switch triggered by a limit structure ensures that the workpiece is properly positioned with the ejector pin before clamping the splined shaft workpiece, improving clamping quality. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the ejector sleeve in a machine tool fixture with an ejector sleeve according to the present invention.

[0010] Figure 2 This is a schematic diagram of the first usage state of a machine tool fixture with a pin sleeve according to the present invention.

[0011] Figure 3 This is a schematic diagram of the second usage state of a machine tool fixture with a pin sleeve according to the present invention.

[0012] Figure 4 This is a schematic diagram of the first sleeve in a machine tool fixture with a pin sleeve according to the present invention.

[0013] Figure 5 This is a schematic diagram of the second sleeve in a machine tool fixture with a pin sleeve according to the present invention.

[0014] Figure 6 This is a schematic diagram of the ejector pin in a machine tool fixture with an ejector pin sleeve according to the present invention. Detailed Implementation

[0015] The present invention will be further described below with reference to embodiments, but the present invention is not limited to these embodiments. Any similar variations using the present invention should be included in the protection scope of the present invention. The use of directional terms such as up, down, front, back, left, right, middle, inside, and outside in the present invention is only for the convenience of clear description and is not intended to limit the technical solution of the present invention.

[0016] like Figures 1-6As shown, this utility model provides a machine tool fixture with an ejector sleeve, including a machine tool spindle 1, a chuck 2 at the front end of the machine tool spindle 1, a jaw 3 at the front end of the chuck 2, an ejector sleeve structure in the chuck 2, the ejector sleeve structure including a first sleeve 4, the first sleeve 4 being fixedly connected to the chuck 2 and coaxially arranged with the machine tool spindle 1, a second sleeve 5 being coaxially fixedly connected to the rear end of the first sleeve 4, a limit ring 6 being provided on the inner side of the rear end of the second sleeve 5, and an ejector 7 being disposed in the second sleeve 5, the ejector 7 being connected to the second... The sleeve 5 forms a sliding pair parallel to the axis of the second sleeve 5. The front end of the ejector pin 7 is provided with a needle tip. The rear end of the ejector pin 7 is coaxially provided with a connecting post 8. The diameter of the connecting post 8 is smaller than the diameter of the ejector pin 7. The connecting post 8 is set in the limiting ring 6. A spring 9 is sleeved on the connecting post 8. The spring 9 is set between the ejector pin 7 and the limiting ring 6. A limiting structure 10 is connected to the rear side of the connecting post 8. The limiting structure 10 is located behind the second sleeve 5. The machine tool spindle 1 is provided with a limit switch (not shown in the figure) that cooperates with the limiting structure 10.

[0017] Preferably, the outer periphery of the first sleeve 4 is provided with a first mounting plate 11, and the first sleeve 4 is fixedly connected to the chuck 2 by the first mounting plate 11 and bolts.

[0018] Preferably, the second sleeve 5 is provided with a second mounting plate 12 on its outer periphery, and the second sleeve 5 is fixedly connected to the first sleeve 4 by the second mounting plate 12 and bolts.

[0019] Preferably, the limiting structure 10 includes a threaded hole provided on the rear end face of the ejector pin 7, in which a screw is threadedly connected. The head of the screw is located behind the second sleeve 5, and the outer diameter of the screw head is larger than the inner diameter of the limiting ring 6.

[0020] The limit switch can be an Omron D2F-L3-A1 limit switch or a SCAIME PTSC1 displacement sensor.

[0021] Specifically, all parts not described in detail in this utility model adopt well-known solutions in the prior art, which are understood and implemented by those skilled in the art, and will not be elaborated here.

[0022] Working principle:

[0023] Before machining the splined shaft workpiece 13, a center hole is pre-machined at the rear end center of the splined shaft workpiece 13. Then, as... Figure 2 As shown, the splined shaft workpiece 13 is inserted into the first sleeve 4 manually or by a robotic arm and pushed backward. The center hole at the rear end of the splined shaft workpiece 13 mates with the ejector pin 7 for positioning. Figure 3As shown, the ejector pin 7 continues to move backward, simultaneously causing the limiting structure 10 to move backward, compressing the spring 9. When the limiting structure 10 moves a set distance, it triggers the limit switch. The limit switch is connected to the machine tool's controller, which controls the chuck 3 to clamp the front end of the spline shaft. The manual or robotic arm then exits, and the machine tool's machining program is started to process the workpiece. After machining, the chuck 3 releases the spline shaft workpiece 13, removing the workpiece. The spring 9 causes the ejector pin 7 to return to its original position forward. The limiting structure 10 can limit the distance the ejector pin 7 can return to its original position forward.

[0024] This invention features a pin sleeve structure in the chuck 2. When the workpiece is inserted into the chuck 2, the pin 7 engages with the center hole at the rear end of the splined shaft workpiece 13, thereby improving the clamping and positioning accuracy of the splined shaft workpiece. This is particularly suitable for longer splined shafts, ensuring consistent machining. Furthermore, the limit switch is triggered by the limit structure 10, ensuring that the workpiece is positioned by engaging the pin 7 before clamping the splined shaft workpiece 13, thus improving the clamping quality.

Claims

1. A machine tool fixture with a ejector sleeve, comprising a machine tool spindle, characterized in that, A chuck is provided at the front end of the machine tool spindle, and jaws are provided at the front end of the chuck. A ejector sleeve structure is provided in the chuck. The ejector sleeve structure includes a first sleeve, which is fixedly connected to the chuck and coaxially arranged with the machine tool spindle. A second sleeve is coaxially fixedly connected to the rear end of the first sleeve. A limit ring is provided on the inner side of the rear end of the second sleeve. An ejector pin is provided in the second sleeve. The ejector pin and the second sleeve form a sliding pair parallel to the axial direction of the second sleeve. A needle tip is provided at the front end of the ejector pin. A connecting post is coaxially arranged at the rear end of the ejector pin. The diameter of the connecting post is smaller than the diameter of the ejector pin. The connecting post is arranged in the limit ring. A spring is sleeved on the connecting post and is arranged between the ejector pin and the limit ring. A limit structure is connected to the rear side of the connecting post. The limit structure is located behind the second sleeve. A limit switch that cooperates with the limit structure is provided in the machine tool spindle.

2. The machine tool fixture with ejector sleeve according to claim 1, characterized in that, The first sleeve is provided with a first mounting plate on its outer periphery, and the first sleeve is fixedly connected to the chuck by the first mounting plate and bolts.

3. A machine tool fixture with an ejector sleeve according to claim 1, characterized in that, The second sleeve is provided with a second mounting plate on its outer periphery, and the second sleeve is fixedly connected to the first sleeve by the second mounting plate and bolts.

4. A machine tool fixture with an ejector sleeve according to claim 1, characterized in that, The limiting structure includes a threaded hole on the rear end face of the ejector pin, in which a screw is threadedly connected. The head of the screw is located behind the second sleeve, and the outer diameter of the screw head is larger than the inner diameter of the limiting ring.

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