A clamping tool for turning a clamping allowance residual bar

Abstract

The utility model discloses a kind of clamping tool for no clamping allowance residual scrap bar turning processing, including cylindrical support section, coaxial arrangement and respectively being set on the cylindrical support section two end surfaces cylindrical clamping section and conical positioning column, cylindrical clamping section is used to clamp on lathe chuck, one end face of no clamping allowance residual scrap bar is opened with the conical center hole of conical positioning column cooperation, another end face of no clamping allowance residual scrap bar is opened with tailstock hole, the diameter of cylindrical support section is less than the diameter of no clamping allowance residual scrap bar.The utility model is simple in structure, in the case where there is no clamping allowance, reliable fixation clamping of no clamping allowance residual scrap bar can also be realized using the clamping tool, and no need to carry out head change direction clamping, once clamping can realize the turning processing of the outer circle of no clamping allowance residual scrap bar, effectively improve the turning efficiency of no clamping allowance residual scrap bar, save processing cost.

Description

Technical Field

[0001] This utility model belongs to the field of turning technology, specifically relating to a clamping fixture for turning scrap bar stock with no clamping allowance. Background Technology

[0002] In daily production at a machining workshop, besides the raw material blanks cut from normal blanking, the blanking section inevitably generates a large amount of scrap bar stock and blanks with non-compliant dimensions. The dimensions of these scrap bar stock and non-compliant blanks are just right for turning commonly used rotating parts such as pins, screws, and columns. Currently, common clamping methods for turning rotating parts include one-clamp-one-center and two-center-one-clamp methods. The one-clamp-one-center clamping method is suitable for longer workpieces. One end of the workpiece is clamped by a chuck, and the other end is supported by a center rest. Center positioning ensures the machining process is smooth. Precision; Two-center clamping and one-clamping is suitable for shorter workpieces. The two ends of the workpiece are clamped by two centers, and the middle part is clamped by a chuck. This method provides better rigidity and improves machining stability. However, these scrap bars and dimensionally unqualified blanks have no clamping allowance and cannot be clamped using three-jaw or four-jaw chucks. Furthermore, it is difficult to reverse the clamping position. Therefore, they can only be treated as scrap or have a large amount of allowance removed for machining smaller products. This wastes raw materials, increases machining time and labor costs, and thus increases product costs. Therefore, a clamping fixture for turning scrap bars with no clamping allowance should be provided. Utility Model Content

[0003] The technical problem to be solved by this utility model is to address the shortcomings of the prior art by providing a clamping fixture for turning scrap bars with no clamping allowance. The fixture has a simple structure and reasonable design. Even when there is no clamping allowance, the fixture can reliably fix and clamp the scrap bars without turning them around. The turning of the outer cylindrical surface of the scrap bars with no clamping allowance can be achieved in one clamping operation, which effectively improves the turning efficiency of scrap bars with no clamping allowance and saves processing costs.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a clamping fixture for turning scrap bar stock with no clamping allowance, characterized in that: it includes a cylindrical support section, a cylindrical clamping section coaxially arranged and respectively disposed on the two end faces of the cylindrical support section, and a frustum-shaped positioning post. The cylindrical clamping section is used to clamp on a lathe chuck. A frustum-shaped center hole that mates with the frustum-shaped positioning post is opened on one end face of the scrap bar stock with no clamping allowance. A center hole is opened on the other end face of the scrap bar stock with no clamping allowance. The diameter of the cylindrical support section is smaller than the diameter of the scrap bar stock with no clamping allowance.

[0005] The above-mentioned clamping fixture for turning scrap bar stock with no clamping allowance is characterized in that: the taper of the frustum-shaped positioning post is in the range of 3° to 5°, and the length of the frustum-shaped positioning post is in the range of 5mm to 10mm.

[0006] The above-mentioned clamping fixture for turning scrap bar stock with no clamping allowance is characterized in that: a detachable bushing is fitted on the cylindrical support section, a detachable tapered sleeve is fitted on the frustoconical positioning post, the bushing and the cylindrical support section and the tapered sleeve and the frustoconical positioning post are fixedly connected by set screws, and a detachable reinforcing ring is fitted on the cylindrical support section, the reinforcing ring being fixedly connected by fastening bolts.

[0007] This utility model has the following advantages compared with the prior art:

[0008] 1. This utility model uses a lathe chuck to clamp the cylindrical clamping section, and the frustum-shaped positioning pin is fitted into the frustum-shaped center hole, ensuring a stable and reliable taper fit between the positioning pin and the center hole. The center point on the lathe tailstock is tightly pressed into the center hole of the blank bar stock with no clamping allowance. This allows the blank bar stock with no clamping allowance to be fixedly installed between the clamping fixture and the center point. When the lathe chuck rotates the clamping fixture, it can also rotate the blank bar stock with no clamping allowance. That is, even without clamping allowance, the blank bar stock with no clamping allowance can be reliably fixed and clamped using this clamping fixture, without the need for reversing the clamping. The outer cylindrical surface of the blank bar stock can be machined in one clamping, effectively improving the machining efficiency of the blank bar stock with no clamping allowance and saving machining costs.

[0009] 2. The clamping fixture of this utility model, used in conjunction with the center, can reliably clamp scrap bars with no clamping allowance, and has a safe retraction space, which can ensure the turning accuracy of scrap bars with no clamping allowance. It can realize the secondary recycling of a large number of scrap bars and non-compliant blanks, reduce the waste of raw materials, and save processing costs.

[0010] 3. This utility model uses a detachable bushing fitted on the cylindrical support section, a detachable conical sleeve fitted on the frustoconical positioning post, and a detachable reinforcing ring fitted on the cylindrical support section. In actual use, the bushing, conical sleeve, and reinforcing ring increase the size and structure of the clamping fixture, making the clamping structure suitable for clamping larger diameter scrap bars with no clamping margin. It is easy to assemble and disassemble, does not require the manufacturing of multiple clamping fixtures of different specifications, and is economical.

[0011] 4. This utility model has a simple structure, reasonable design, low manufacturing cost, and is easy to promote and apply.

[0012] In summary, this utility model has a simple structure and reasonable design. Even without clamping allowance, this clamping fixture can reliably fix and clamp the scrap bar without clamping allowance, and there is no need to turn it around or change its direction. The turning of the outer cylindrical surface of the scrap bar without clamping allowance can be achieved in one clamping, which effectively improves the turning efficiency of the scrap bar without clamping allowance and saves processing costs.

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model.

[0015] Figure 2 This is a schematic diagram of the usage state of Embodiment 1 of this utility model.

[0016] Figure 3 This is a schematic diagram of the usage state of Embodiment 2 of this utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1-1—Cylindrical support section; 1-2—Cylindrical clamping section; 1-3—Frustum-shaped positioning column;

[0019] 2—Lathe chuck; 3—Center; 4—Scrap bar stock with no clamping allowance;

[0020] 5—Sleeve; 6—Set screw; 7—Reinforcing ring;

[0021] 8—Fastening bolt; 9—Conical sleeve. Detailed Implementation

[0022] The technical solution of this utility model is described in detail through Embodiments 1 and 2:

[0023] Example 1

[0024] like Figure 1 and Figure 2As shown, this utility model includes a cylindrical support section 1-1, a cylindrical clamping section 1-2 coaxially arranged and respectively disposed on the two end faces of the cylindrical support section 1-1, and a frustum-shaped positioning post 1-3. The cylindrical clamping section 1-2 is used to clamp on the lathe chuck 2. A frustum-shaped center hole 4-1 that mates with the frustum-shaped positioning post 1-3 is opened on one end face of the scrap bar 4 with no clamping margin. A center hole is opened on the other end face of the scrap bar 4 with no clamping margin. The diameter of the cylindrical support section 1-1 is smaller than the diameter of the scrap bar 4 with no clamping margin.

[0025] In this embodiment, the coaxially arranged cylindrical support section 1-1, cylindrical clamping section 1-2, and frustum-shaped positioning post 1-3 are integrated into a single structure. The cylindrical support section 1-1 serves to support and connect the cylindrical clamping section 1-2 and the frustum-shaped positioning post 1-3. The diameter of the cylindrical support section 1-1 is smaller than the diameter of the blank bar stock 4 without clamping allowance to be processed. When turning the outer cylindrical surface of the blank bar stock 4 without clamping allowance, there is a safe retraction space, and the cutting tool will not collide with the cylindrical support section 1-1. By providing the cylindrical clamping section 1-2 for clamping on the lathe chuck 2, the clamping section 1-2 can be used to clamp the blank bar stock 4. The clamping fixture can be quickly assembled and disassembled on the lathe chuck 2, and can ensure that the clamping fixture is stably and reliably clamped on the lathe chuck 2. By opening a frustum-shaped center hole 4-1 on one end face of the scrap bar 4 with no clamping margin, and setting a frustum-shaped positioning post 1-3 on the cylindrical support section 1-1, one end of the scrap bar 4 with no clamping margin is engaged by the conical surface between the frustum-shaped positioning post 1-3 and the frustum-shaped center hole 4-1, and the other end of the scrap bar 4 with no clamping margin is pressed by the center point 3. That is, under the combined action of the clamping fixture and the center point 3, the scrap bar 4 with no clamping margin can be fixedly clamped on the lathe chuck 2.

[0026] In actual use, it is only necessary to clamp the cylindrical clamping section 1-2 on the lathe chuck 2, then fit the frustum-shaped center hole 4-1 of the scrap bar 4 with no clamping allowance onto the frustum-shaped positioning post 1-3, and finally, press the center point 3 on the tailstock of the lathe tightly against the center hole of the scrap bar 4 with no clamping allowance. This can achieve the clamping of the scrap bar 4 with no clamping allowance on the lathe. When the lathe chuck 2 drives the clamping fixture to rotate, it can drive the scrap bar 4 with no clamping allowance to rotate. That is, even without clamping allowance, the scrap bar 4 with no clamping allowance can be reliably fixed and clamped using the clamping fixture, and there is no need to turn it around and change the direction of clamping. The turning of the outer cylindrical surface of the scrap bar 4 with no clamping allowance can be achieved in one clamping, which effectively improves the turning efficiency of the scrap bar 4 with no clamping allowance and saves processing costs.

[0027] In this embodiment, the taper of the frustum-shaped positioning post 1-3 ranges from 3° to 5°, and the length of the frustum-shaped positioning post 1-3 ranges from 5mm to 10mm.

[0028] In actual use, after multiple tests, it was found that when the taper of the frustum-shaped positioning pins 1-3 is between 3° and 5°, the clamping effect of the scrap bar stock 4 with no clamping margin is the best, and the coaxiality and stability of the scrap bar stock 4 with no clamping margin are optimal as the lathe chuck 2 rotates.

[0029] In this embodiment, the length of the frustum-shaped central hole 4-1 is greater than the length of the frustum-shaped positioning post 1-3, and the difference between the length of the frustum-shaped central hole 4-1 and the length of the frustum-shaped positioning post 1-3 ranges from 2mm to 3mm.

[0030] Example 2

[0031] like Figure 3 As shown, unlike Embodiment 1, in this embodiment, a detachable bushing 5 is fitted on the cylindrical support section 1-1, and a detachable conical sleeve 9 is fitted on the frustum-shaped positioning post 1-3. The bushing 5 and the cylindrical support section 1-1, as well as the conical sleeve 9 and the frustum-shaped positioning post 1-3, are fixedly connected by set screws 6. A detachable reinforcing ring 7 is fitted on the cylindrical support section 1-1, and the reinforcing ring 7 is fixedly connected by fastening bolts 8.

[0032] In this embodiment, a detachable bushing 5 is fitted onto the cylindrical support section 1-1, a detachable conical sleeve 9 is fitted onto the frustoconical positioning post 1-3, and a detachable reinforcing ring 7 is fitted onto the cylindrical support section 1-1. In actual use, the bushing 5, conical sleeve 9, and reinforcing ring 7 are used to increase the size and structure of the clamping fixture, so that the clamping structure can be used to clamp the scrap bar 4 with a larger diameter and no clamping margin. It is easy to assemble and disassemble, does not require the manufacturing of multiple clamping fixtures of different specifications, and is economical.

[0033] In this embodiment, the set screw 6 between the bushing 5 and the cylindrical support section 1-1 is arranged on the outer circular surface of the bushing 5, and the set screw 6 between the conical sleeve 9 and the frustum-shaped positioning post 1-3 is arranged on the end face of the conical sleeve 9.

[0034] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A clamping fixture for turning scrap bar stock with no clamping allowance, characterized in that: It includes a cylindrical support section (1-1), a cylindrical clamping section (1-2) coaxially arranged and respectively set on the two end faces of the cylindrical support section (1-1), and a frustum-shaped positioning post (1-3). The cylindrical clamping section (1-2) is used to clamp on the lathe chuck (2). A frustum-shaped center hole (4-1) that matches the frustum-shaped positioning post (1-3) is opened on one end face of the scrap bar stock (4) without clamping margin. A center hole is opened on the other end face of the scrap bar stock (4) without clamping margin. The diameter of the cylindrical support section (1-1) is smaller than the diameter of the scrap bar stock (4) without clamping margin.

2. A clamping fixture for turning scrap bar stock with no clamping allowance as described in claim 1, characterized in that: The taper of the frustum-shaped positioning post (1-3) ranges from 3° to 5°, and the length of the frustum-shaped positioning post (1-3) ranges from 5mm to 10mm.

3. A clamping fixture for turning scrap bar stock with no clamping allowance as described in claim 1, characterized in that: A detachable bushing (5) is fitted on the cylindrical support section (1-1), and a detachable conical sleeve (9) is fitted on the frustum-shaped positioning post (1-3). The bushing (5) and the cylindrical support section (1-1) and the conical sleeve (9) and the frustum-shaped positioning post (1-3) are fixedly connected by set screws (6). A detachable reinforcing ring (7) is fitted on the cylindrical support section (1-1), and the reinforcing ring (7) is fixedly connected by fastening bolts (8).

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