An expansion fixture for a lathe

Abstract

The utility model relates to an expansion clamp for lathe. The traditional lathe clamp is easy to scratch the workpiece surface, has poor adaptability, low operation efficiency and lacks anti -drop protection. The utility model discloses the clamping rod, expansion clamp block, snap ring and fastening conical nut, the clamping rod sets up on the three -jaw chuck of lathe, expansion clamp block with fastening conical nut all sets up on clamping rod, fastening conical nut one end sets up in expansion clamp block and extrudes expansion clamp block radial expansion, the snap ring sets up on fastening conical nut and is located between expansion clamp block with fastening conical nut, the workpiece is set up on the expansion clamp block periphery. The utility model is not easy to scratch the workpiece surface, has high adaptability, high operation efficiency and has double anti -drop protection.

Description

Technical Field

[0001] This utility model relates to the field of clamping tool technology, specifically to an expansion clamp for a lathe. Background Technology

[0002] A lathe fixture is a device mounted on the spindle or tailstock of a lathe. Its main function is to safely, accurately, and reliably clamp the workpiece, so that the workpiece maintains the correct position and posture during the turning process and can withstand the cutting force.

[0003] The three-jaw chuck is the most commonly used and standard lathe fixture. It is directly mounted on the lathe spindle, driving the workpiece to rotate. Suitable for regular shapes, the three jaws of the chuck move radially simultaneously, automatically centering the workpiece and clamping round or hexagonal cross-sections. Clamping is quick and convenient, but its centering accuracy is limited. Furthermore, when machining easily damaged workpieces such as aluminum or thin-walled materials on a lathe, direct clamping with a traditional three-jaw chuck has the following drawbacks:

[0004] 1. Risk of workpiece damage: Rigid clamping can easily scratch the workpiece surface, leading to an increased scrap rate;

[0005] 2. Poor clamping adaptability: It is not suitable for workpieces with special inner diameters or fine workpieces in the later stages of machining. The jaws on the chuck cannot stably clamp the workpiece, which may cause the workpiece to stop rotating during the machining process, resulting in tool damage or workpiece scrap.

[0006] 3. Low operating efficiency and safety: Frequent adjustment of the chuck is required, and there is a lack of anti-detachment protection, resulting in insufficient safety.

[0007] Therefore, there is an urgent need for a lathe fixture that is not easy to scratch the surface of the workpiece, can be adapted to workpieces with different inner diameters, is highly efficient, and has anti-detachment protection. Summary of the Invention

[0008] The purpose of this invention is to provide an expansion clamp for lathes, which at least solves the problems of traditional lathe clamps that easily scratch the workpiece surface, have poor adaptability, low operating efficiency, and lack anti-detachment protection.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] An expansion clamp for a lathe includes a clamping rod, an expansion block, a retaining ring, and a fastening tapered nut;

[0011] The clamping rod is mounted on the three-jaw chuck of the lathe. The expansion clamp and the fastening tapered nut are both sleeved on the clamping rod. One end of the fastening tapered nut is located inside the expansion clamp and compresses the expansion clamp to expand radially. The retaining ring is sleeved on the fastening tapered nut and is located between the expansion clamp and the fastening tapered nut. The workpiece is sleeved on the outer periphery of the expansion clamp.

[0012] Furthermore, the clamping rod is cylindrical, and the outer wall of the clamping rod located on the side of the fastening conical nut has multiple micro-holes.

[0013] Furthermore, the micropores are arranged at equal intervals along the axial direction of the clamping rod.

[0014] Furthermore, the expansion clamp is cylindrical, and a through hole and a mounting hole are formed in the middle of the expansion clamp.

[0015] Furthermore, the expansion clamp has a pressure relief groove at the end away from the fastening conical nut, and a plurality of grooves at intervals at the end near the fastening conical nut.

[0016] Furthermore, the fastening conical nut includes a connecting cap and a connecting member. The top of the connecting member is connected to the bottom of the connecting cap. The connecting cap and the connecting member are integrally formed with an insertion hole in the middle. The end of the connecting member away from the connecting cap is embedded inside the expansion clamp.

[0017] Furthermore, the connecting cover has a hexagonal cross-section and is provided with a locking wire groove that mates with the microhole.

[0018] Furthermore, the cross-section of the connector is trapezoidal.

[0019] Furthermore, the clamping rod and the fastening tapered nut are connected by a thread.

[0020] Furthermore, the retaining ring is disc-shaped, and an opening is provided in the center of the retaining ring.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. This utility model provides an expansion clamp for a lathe. The expansion clamp is made of nylon. Through the flexible contact of the expansion clamp, scratches on the workpiece surface caused by rigid contact can be avoided, thereby achieving damage-free clamping of easily damaged workpieces (such as aluminum parts), greatly improving the yield rate. Furthermore, the outer diameter of the expansion clamp can be flexibly processed according to the inner diameter of the workpiece. When processing the outer diameter of the expansion clamp, a gap of 0.04-0.06mm is reserved between it and the inner wall of the workpiece to allow space for the expansion deformation of the expansion clamp, thus making it flexible in adaptability and able to adapt to workpieces with different inner diameters, expanding the processing range of the lathe. When the conical nut is tightened in the expansion clamp, it compresses the expansion clamp to expand radially, so that the expansion clamp is tightly attached to the inner wall of the workpiece. For special inner diameters or fine workpieces in the later stages of processing, it can stably clamp, thereby improving the adaptability of clamping.

[0023] 2. The fastening tapered nut of this utility model is equipped with a retaining ring, which can prevent the workpiece from sliding axially and prevent it from falling off axially after clamping. The clamping rod is provided with micro-holes, and the fastening tapered nut is provided with a locking wire groove. A special steel wire is inserted and locked into the locking wire groove and micro-holes, thereby locking the fastening tapered nut. Through the double anti-disengagement of the retaining ring and steel wire locking, the clamping reliability can be guaranteed when the lathe is running at high speed, improving the clamping stability and safety, preventing the workpiece or fixture from falling off during processing. Moreover, the clamping steps are simple, requiring no complicated debugging, reducing the operation threshold, shortening the processing preparation time, and thus improving the operation efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is the front view of this utility model;

[0027] Figure 3 yes Figure 2 AA section view in the middle;

[0028] Figure 4 This is the right view of this utility model;

[0029] Figure 5 This is a schematic diagram of the expansion clamping block;

[0030] The diagram is labeled as follows:

[0031] 1-Clamping rod, 11-Microhole, 2-Expansion clamping block, 21-Mounting hole, 22-Groove, 3-Snap ring, 4-Fastening conical nut. Detailed Implementation

[0032] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0033] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In a specific implementation, Figure 1 The length direction of the clamping rod 1 is defined as the axial direction. Figure 1 The length direction perpendicular to clamping rod 1 is defined as radial.

[0036] Example:

[0037] like Figure 1 and Figure 2 As shown, this embodiment provides an expansion clamp for a lathe, including a clamping rod 1, an expansion clamping block 2, a retaining ring 3, and a fastening conical nut 4, with the workpiece sleeved on the outer periphery of the expansion clamping block 2.

[0038] Specifically, clamping rod 1 serves as the main support, and clamping rod 1 is clamped on the three-jaw chuck of the lathe. Expansion block 2 and fastening tapered nut 4 are both sleeved on clamping rod 1.

[0039] The clamping rod 1 is made of steel and is cylindrical. Multiple micro-holes 11 are provided on the outer wall of the clamping rod 1 located on the side of the fastening conical nut 4. The conical nut 4 is locked in place by the micro-holes 11 and a special steel wire.

[0040] In this embodiment, the microholes 11 are arranged at equal intervals along the axial direction of the clamping rod 1, and the microholes 11 are arranged radially through the clamping rod 1.

[0041] Specifically, such as Figure 3 and Figure 5As shown, the expansion clamp 2 is made of nylon and is cylindrical in shape. A through hole is provided on the side of the expansion clamp 2 away from the fastening conical nut 4. The expansion clamp 2 is sleeved on the clamping rod 1 through the through hole. An installation hole 21 is provided on the side of the expansion clamp 2 near the fastening conical nut 4. The diameter of the installation hole 21 is larger than the diameter of the through hole, and the installation hole 21 and the through hole are connected. The fastening conical nut 4 is tightened into the installation hole 21 of the expansion clamp 2. Due to the flexibility of the expansion clamp 2, the installation hole 21 is squeezed during the tightening process of the fastening conical nut 4, which makes the diameter of the installation hole 21 larger. The fastening conical nut 4 and the expansion clamp 2 are in contact through the inclined surface, which makes the diameter of the expansion clamp 2 larger, thereby making the expansion clamp 2 clamp the workpiece. Through the flexible contact of the expansion clamp 2, the surface scratches of the workpiece caused by rigid contact can be avoided, thereby realizing the non-damage clamping of easily damaged workpieces (such as aluminum parts) and greatly improving the yield.

[0042] In this embodiment, the end of the expansion clamp 2 away from the fastening conical nut 4 is provided with a pressure-reducing groove to offset the internal stress when the expansion clamp 2 expands and deforms, ensuring uniform expansion and preventing cracking. The end near the fastening conical nut 4 is provided with four grooves 22 at intervals to enhance the friction with the inner wall of the workpiece. The grooves 22 are distributed in a circle around the outer wall of the expansion clamp 2 at equal intervals, and the opening of the grooves 22 is flush with the end face of the expansion clamp 2, so that the end of the expansion clamp 2 near the fastening conical nut 4 forms a concave-convex structure.

[0043] The outer diameter of the expansion clamp 2 can be flexibly processed according to the inner diameter of the workpiece. When processing the outer diameter of the expansion clamp 2, a gap of 0.04-0.06mm is reserved between it and the inner wall of the workpiece to provide space for the expansion deformation of the expansion clamp 2, making it flexible in adaptability. By customizing the outer diameter of the expansion clamp 2, it can adapt to workpieces with different inner diameters and expand the processing range of the lathe.

[0044] Specifically, one end of the fastening tapered nut 4 is placed inside the expansion clamping block 2. When the fastening tapered nut 4 is tightened, the expansion clamping block 2 is squeezed to expand radially, so that the expansion clamping block 2 is tightly attached to the inner wall of the workpiece. For special inner diameters or fine workpieces in the later stages of processing, it can be stably clamped, improving the adaptability of clamping.

[0045] In this embodiment, the fastening conical nut 4 is made of steel and includes a connecting cover and a connecting member. The top of the connecting member is integrally connected to the bottom center of the connecting cover. The middle of the connecting cover and the connecting member is integrally provided with an insertion hole. The fastening conical nut 4 is sleeved on the clamping rod 1 through the insertion hole. The end of the connecting member away from the connecting cover is embedded in the expansion clamp 2.

[0046] Specifically, such as Figure 4As shown, the cross-section of the connecting cover is hexagonal, which facilitates wrench operation. The connecting cover is provided with a locking wire groove that mates with the micro-hole 11. A special steel wire is inserted into the micro-hole 11 and the special steel wire is wound around the locking wire groove to tighten the conical nut 4, thereby locking and tightening the conical nut 4. By cooperating with the micro-hole 11 of the clamping rod 1 through the locking wire groove, the conical nut 4 can be prevented from falling off when it is running at high speed.

[0047] The connector has a trapezoidal cross-section, and the diameter of the end face of the connector away from the connecting cover is smaller than the diameter of the end face near the connecting cover, thus making it a conical structure, which facilitates tightening the fastening conical nut 4 and squeezing the expansion clamp 2 for radial expansion.

[0048] In this embodiment, the clamping rod 1 and the insertion hole of the fastening conical nut 4 are connected by a fine thread, which can optimize the clamping accuracy while micro-tightening. The inner wall of the insertion hole of the fastening conical nut 4 is provided with an internal thread, and the outer wall of the clamping rod 1 located at the fastening conical nut 4 is provided with an external thread.

[0049] Specifically, the retaining ring 3 is fitted onto the fastening tapered nut 4. The retaining ring 3 can prevent the workpiece from sliding axially and prevent it from falling off axially after clamping.

[0050] The retaining ring 3 is made of steel and is disc-shaped. It has an opening in the middle, the diameter of which is smaller than the diameter of the connecting cover of the fastening tapered nut 4. The retaining ring 3 is fitted onto the outer wall of the fastening tapered nut 4 through the opening, so that the fastening tapered nut 4 can press the retaining ring 3 through the connecting cover. After the fastening tapered nut 4 is screwed into the expansion clamp 2, the side of the expansion clamp 2 close to the fastening tapered nut 4 forms a slight slope, so that the workpiece will be subjected to force towards the side closer to the three-jaw chuck. At this time, the lathe's three-jaw chuck will block the workpiece from moving to the left. At the same time, the retaining ring 3 blocks the right side of the workpiece, which can also prevent the workpiece from moving to the right.

[0051] In this embodiment, the double anti-disengagement mechanism of the retaining ring 3 and the steel wire lock ensures the reliability of clamping when the lathe is running at high speed, improves clamping stability and safety, prevents the workpiece or fixture from falling off during processing, and the clamping steps are simple, requiring no complicated debugging, which lowers the operating threshold, shortens the processing preparation time, and thus improves operating efficiency.

[0052] The operation steps in this embodiment are as follows:

[0053] 1. Fixed clamping rod 1

[0054] Clamp rod 1 is mounted on the lathe's three-jaw chuck and secured.

[0055] 2. Adaptive expansion clamp 2

[0056] Based on the inner diameter of the workpiece, the outer diameter of the expansion clamp 2 is machined, and a gap of 0.05mm is reserved between it and the inner wall of the workpiece.

[0057] 3. Assemble the workpiece

[0058] Insert the expansion clamp 2 onto the clamping rod 1, and then fit the workpiece onto the outer periphery of the expansion clamp 2.

[0059] 4. Install and tighten the tapered nut.

[0060] The retaining ring 3 is placed on the connector of the fastening conical nut 4. Then, the fastening conical nut 4 and the retaining ring 3 are placed on the clamping rod 1. The connector of the fastening conical nut 4 is screwed into the expansion clamp 2 and tightened. The conical surface of the connector is used to squeeze the expansion clamp 2 to make the expansion clamp 2 expand radially and fit tightly against the inner wall of the workpiece.

[0061] 5. Double anti-hair loss

[0062] A special steel wire is inserted into the micro-hole 11 of the clamping rod 1 and inserted into the locking wire groove of the fastening conical nut 4 to wrap around the fastening conical nut 4. The fastening conical nut 4 can be locked by the double anti-disengagement of the retaining ring 3 and the steel wire locking.

[0063] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. An expansion clamp for a lathe, characterized in that: It includes a clamping rod (1), an expansion clamp (2), a retaining ring (3), and a fastening conical nut (4); The clamping rod (1) is mounted on the three-jaw chuck of the lathe. The expansion clamping block (2) and the fastening tapered nut (4) are both sleeved on the clamping rod (1). One end of the fastening tapered nut (4) is located inside the expansion clamping block (2) and squeezes the expansion clamping block (2) to expand radially. The retaining ring (3) is sleeved on the fastening tapered nut (4) and located between the expansion clamping block (2) and the fastening tapered nut (4). The workpiece is sleeved on the outer periphery of the expansion clamping block (2).

2. The lathe expansion clamp according to claim 1, characterized in that: The clamping rod (1) is cylindrical, and multiple micro-holes (11) are provided on the outer wall of the clamping rod (1) located on the side of the fastening conical nut (4).

3. The lathe expansion clamp according to claim 2, characterized in that: The micropores (11) are arranged at equal intervals along the axial direction of the clamping rod (1).

4. The lathe expansion clamp according to claim 1, characterized in that: The expansion clamp (2) is cylindrical, and a through hole and a mounting hole (21) are provided in the middle of the expansion clamp (2).

5. The lathe expansion clamp according to claim 1, characterized in that: The expansion clamp (2) has a pressure relief groove at the end away from the fastening conical nut (4), and a plurality of grooves (22) are spaced apart at the end near the fastening conical nut (4).

6. The lathe expansion clamp according to claim 2, characterized in that: The fastening conical nut (4) includes a connecting cover and a connector. The top of the connector is connected to the bottom of the connecting cover. The middle of the connecting cover and the connector are integrally formed with an insertion hole. The end of the connector away from the connecting cover is embedded inside the expansion clamp (2).

7. The lathe expansion clamp according to claim 6, characterized in that: The connecting cover has a hexagonal cross-section and is provided with a locking wire groove that cooperates with the microhole (11).

8. A lathe expansion clamp according to claim 6, characterized in that: The cross-section of the connector is trapezoidal.

9. The lathe expansion clamp according to claim 1, characterized in that: The clamping rod (1) and the fastening tapered nut (4) are connected by threads.

10. A lathe expansion clamp according to claim 1, characterized in that: The retaining ring (3) is disc-shaped, and an opening is provided in the middle of the retaining ring (3).

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