Full-automatic nut machining device

Abstract

The utility model discloses a full-automatic nut machining device. The clamping device comprises a fixing sleeve and a clamping head located in the fixing sleeve, a conical head used for containing a bar is arranged on the front portion of the clamping head, a narrow groove which penetrates from the rear half portion to the front end and is used for enabling the clamping head to generate elastic deformation is formed in the clamping head, a horn mouth matched with the conical head is formed in the fixing sleeve, and the rear end of the clamping head is connected with a pull rod capable of axially moving. And the pull rod drives the chuck to move back and forth so as to release and clamp the bar. The clamping device has the advantages that the pull rod drives the chuck to move back and forth so as to release and clamp a bar, and the chuck can be retracted into the fixing sleeve when the bar is clamped through the back-pull type clamping structure, so that the extension length of the bar is effectively reduced, the phenomenon that threads, an inner hole and a hexagonal surface are not concentric due to centrifugal force is avoided, the machining precision is guaranteed, and meanwhile, the machining efficiency is improved. And the engineering installation difficulty caused by machining errors is also reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a processing device, especially a nut full automatic processing device. BACKGROUND

[0002] The processing mode of the conventional nut usually adopts a front pushing type clamping mechanism to clamp the bar stock. Generally speaking, the front pushing type clamping mechanism comprises a fixed sleeve, a chuck located in the cavity of the fixed sleeve and a push rod connected to the rear end of the chuck. The front end of the fixed sleeve has a closed cavity, the front end of the chuck has an elastic conical head, the chuck is installed in the cavity and the elastic conical head is retracted by the axial forward thrust applied by the push rod to clamp the workpiece or loosen the workpiece under the rear pulling action. When loosening, the chuck cannot be completely opened to the expected extent due to the limitation of the closed cavity of the front end of the fixed sleeve, so there is a defect that the chuck cannot be completely loosened in actual application. In the processing process, the extension length of the bar stock is usually 40mm, the processing is completed by a turning tool, and finally a cutting tool is used to cut the finished product. However, due to the long extension length of the bar stock, the processing precision is reduced due to the influence of centrifugal force in the processing process, which is specifically manifested in that the thread, the inner hole and the hexagonal surface are not concentric, and the size of the flat chamfer is uneven. These quality problems often cause difficulties in engineering installation, resulting in that the bar stock cannot be smoothly replaced, which brings great inconvenience to the continuous processing of parts, reduces the processing efficiency, and seriously causes customer complaints and returns, resulting in economic losses and a decrease in customer satisfaction. SUMMARY

[0003] The utility model solves the technical problem to provide a nut full automatic processing device which has higher processing quality and more convenient chuck replacement.

[0004] In order to solve the above technical problems, the nut full automatic processing device of the utility model comprises a fixed sleeve and a chuck located in the inside of the fixed sleeve, the front part of the chuck is provided with a conical head for accommodating the bar stock, a slot is opened on the chuck, the slot penetrates from the rear half to the front end and is used for making the chuck produce elastic deformation, a flared opening is arranged on the fixed sleeve and matched with the conical head, the rear end of the chuck is connected with a pull rod which can move axially, the pull rod drives the chuck to move forward and backward, thereby realizing the release and clamping of the bar stock.

[0005] The rear end of the slot is provided with a process hole.

[0006] The number of the slots is 2-4.

[0007] The slots are evenly distributed along the radial direction of the central axis of the chuck.

[0008] The outside of the fixed sleeve is provided with a fixing flange for fixing the fixed sleeve on the spindle head of the machine tool.

[0009] The collet has an outer surface in sliding fit with the fixing sleeve and has a necked section in the middle part of the collet.

[0010] The rear guide sleeve is provided outside the pull rod and has an inner cavity matching the pull rod, and the inner cavity diameter of the rear guide sleeve is smaller than that of the fixing sleeve.

[0011] The nut full-automatic machining device has the advantages that

[0012] (1) The pull rod drives the collet to move forward and backward to release and clamp the bar, and through the rear-pulling clamping structure, the collet can be retracted into the fixing sleeve when clamping the bar, the extension length of the bar is effectively reduced, the phenomenon of different centers of threads, inner holes and hexagonal surfaces caused by centrifugal force is avoided, the machining precision is ensured, and the engineering installation difficulty caused by machining errors is reduced.

[0013] (2) The rear-pulling clamping mechanism drives the slot of the collet to clamp and release by using the axial tension of the pull rod. When the bar needs to be clamped, the pull rod applies tension to the rear, and the slot of the collet is closed. When the bar needs to be released, the collet is extended out of the fixing sleeve, and the slot is automatically opened under the action of the elastic restoring force, so that the slot can completely release the bar. Therefore, the machining process is simplified, and the problem of difficult replacement of parts caused by the traditional front-pushing clamping mechanism due to the fact that the collet cannot be completely released is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a partial sectional view of the nut full-automatic machining device of the utility model. DETAILED DESCRIPTION

[0015] The nut full-automatic machining device of the utility model will be further described in detail below in combination with the drawings and specific embodiments.

[0016] The nut full-automatic machining device of the utility model is as shown in Figure 1The utility model discloses a nut full automatic processing device, which comprises a fixed sleeve 1 and a chuck 2 located inside the fixed sleeve 1, the chuck 2 is made of high-strength elastic material, and the front part of the chuck 2 is provided with a tapered head for accommodating a bar; a slot 3 is formed in the chuck 2, which penetrates from the rear half to the front end and is used for elastically deforming the chuck 2, the slot 3 is symmetrically distributed or 3-4 radially uniformly distributed along the central axis of the chuck 2, and the rear end of the slot 3 is provided with a process hole 6 for reducing stress and preventing cracking during processing; the fixed sleeve 1 is provided with a flared mouth matched with the tapered head, the rear end of the chuck 2 is connected with a pull rod 4 capable of moving axially, the pull rod 4 drives the chuck 2 to move forward and backward, thereby realizing the release and clamping of the bar; the chuck has an outer surface that is in sliding fit with the fixed sleeve 1, and the middle part of the chuck has a necked section, the diameter of the middle part of the chuck 2 is smaller than the inner cavity diameter of the fixed sleeve 1, so as to reduce the friction; the outer side of the fixed sleeve 1 is provided with a fixing flange 5 for fixing the device on the spindle head of a machine tool, so as to stably fix the device on the machine tool; the fixed sleeve 1 is provided with a flared mouth matched with the tapered head, and the rear end of the chuck 2 is connected with the pull rod 4; the pull rod 4 is externally provided with a rear guide sleeve 7 with an inner cavity size matched with the pull rod 4, the inner cavity diameter of the rear guide sleeve 7 is smaller than the fixed sleeve 1, the rear part of the chuck is a chuck rod part, the front part and the rear part of the chuck rod part are both matched with the inner cavity diameter of the fixed sleeve 1, the chuck 2 is moved backward by the axial movement of the pull rod 4 to clamp the bar, and at the same time, since the diameter of the rear part of the chuck 2 is larger than the inner cavity diameter of the rear guide sleeve 7, when the chuck 2 is pulled backward to a predetermined position, the rear guide sleeve 7 limits the movement of the chuck 2, effectively preventing excessive movement. The bar is processed by various tools in the nut full automatic processing device to form threads, inner holes, inner grooves, planes and chamfers, and then the bar is cut off after being pulled to a precise position by a special bar pulling device to complete all processes, thereby solving the problem of different concentricities of the inner hole, the thread and the hexagonal surface, ensuring that the planes and chamfers are not different in size, and improving customer satisfaction.

[0017] According to the practical verification, by changing the force application direction, the movement mode of the chuck and the fixing mode of the fixed sleeve and the chuck, the clamping mechanism is changed from the front pushing type to the rear pulling type, the concentricity of the part is improved from ±0.2mm to ±0.05mm, the qualified rate of the part is improved from 92% to 99%, the raw material cost is reduced, the tail length of the raw material is reduced from 70mm to 30mm, each raw material can process 2 parts, and the effect is remarkable.

Claims

1. A nut full-automatic processing device, characterized in that: The utility model relates to a kind of bar clamping devices, including fixed sleeve (1) and the chuck (2) inside fixed sleeve (1), the front of the chuck (2) is equipped with the taper head for accommodating bar, the slot (3) for making chuck (2) elastic deformation is opened in the chuck (2) from rear half to front end and for accommodating bar, the fixed sleeve (1) is equipped with the trumpet mouth of adaptation with taper head, the rear end of the chuck (2) is connected with the pull rod (4) that can be axially moved, by the pull rod (4) drive chuck (2) back and forth movement in turn realize the release and clamping of bar.

2. The nut full-automatic processing device according to claim 1, characterized in that: The rear end of the slot (3) is provided with a process hole (6).

3. The apparatus for full automation of nut processing according to claim 2, characterized in that: The number of the slot (3) is 2-4.

4. The apparatus for full automation of nut processing according to claim 3, characterized in that: The slot (3) is evenly distributed radially along the central axis of the chuck (2).

5. The apparatus for full automation of nut processing according to claim 1, characterized in that: The outside of the fixed sleeve (1) is provided with a fixing flange (5) for fixing it on the spindle head of the machine tool.

6. The nut fully automated processing apparatus according to claim 1, characterized in that: The chuck has an outer surface that slides with the fixed sleeve (1) and has a necked section in the middle of the chuck.

7. The nut fully automated processing apparatus according to claim 1, characterized in that: The pull rod (4) is provided with a rear guide sleeve (7) outside, the inner diameter of the rear guide sleeve (7) is smaller than the fixed sleeve (1).

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