Improved lathe backer tool

Abstract

A conical section, a cylindrical section and a small step which are sequentially connected are arranged on the periphery of a tool body, a conical cavity is formed in the tool body, a through hole is formed in the center of the connecting position of the tail end of the cylindrical section and the small step, an outer conical gasket is installed in the cavity, and a concave surface step is arranged in the middle of the outer conical gasket. And a center hole is formed in the center of the concave step. The tool is easy to install and convenient to use, in the turning process, by means of the force of the inner cone part of the lathe spindle hole and the force of the inner cone part of the cavity of the backer tool, a workpiece cannot move into the lathe spindle hole, clamping is stable, the using effect is excellent, the product quality is guaranteed, and the machining efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lathe processing, in particular to an improved lathe backing tool. Background Art

[0002] The lathe is processing the screw workpiece (such as Figure 1 (As shown) During threading, the chuck is clamped on the outer diameter of the screw rod, and the "one clamp and one push" clamping method is used for turning. When the screw cutter is turning, a large axial force will be generated, which will easily cause the screw rod to move into the main shaft hole of the lathe, causing the cutter to hit, thus affecting the threading process. For similar shaft workpieces, in the case of large "back cutting amount" cutting feed, the workpiece is also prone to move into the main shaft hole of the lathe, affecting normal turning. The currently used circular lathe backing plate 3 (as shown) with three claw grooves evenly distributed around the circumference Figure 2 As shown), to be clamped into the claw 2 of the lathe chuck, when the lathe spindle 4 is used, the chuck and the claw 2 are connected (as shown in FIG. Figure 3 As shown). The backing plate 3 before improvement is installed into the outer end face of the chuck, and the light rod section of the screw rod 1 is clamped by the claw 2 and supported by the backing plate 3 before improvement, thereby turning. The existing problem is that when the screw rod 1 or the shaft workpiece is too long, the rigidity becomes poor, the tool is easy to vibrate and hit during the turning process, the turning efficiency is reduced, and the turning quality is poor.

[0003] Therefore, there is an urgent need for a lathe support tooling that can quickly position a screw rod 1 or a shaft workpiece, block the workpiece from moving into the spindle hole of the lathe, is easy to install on the lathe, and can effectively solve the problem of poor turning rigidity of long screw rods 1 or long shaft workpieces. Utility Model Content

[0004] The purpose of the utility model is to provide an improved lathe backing tool, which can effectively prevent screw rods and shaft workpieces from moving into the spindle hole of the lathe during the turning process, and solve the problem of poor turning rigidity of long screw rods and long shaft workpieces that cannot be solved by the currently used backing tool, thereby affecting normal turning processing, thereby improving processing efficiency and product quality.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: An improved lathe backing tool, the tool body is a variable diameter cylinder, the outer circumference of which is a tapered section, a cylindrical section and a small step connected in sequence, a tapered cavity is arranged inside, a through hole is arranged at the center of the connection between the tail end of the cylindrical section and the small step, an outer tapered gasket is installed in the cavity, a concave step is arranged in the middle of the outer tapered gasket, and a center hole is arranged at the center of the concave step.

[0006] Furthermore, the conical surface of the outer peripheral conical section of the tool body matches the inner conical surface of the lathe spindle.

[0007] Furthermore, the inner circumference taper of the cavity is equal to the taper of the outer conical gasket.

[0008] Furthermore, the diameter of the cylindrical section is slightly smaller than the diameter of the straight hole section of the inner hole of the lathe spindle.

[0009] Furthermore, the diameter of the central hole of the outer conical gasket is smaller than the diameter of the through hole and the screw workpiece.

[0010] The utility model discloses installation is simple, and use is convenient, and during the turning process, with the help of the power of the inner cone part of the lathe spindle hole and the inner cone part of the cavity of the backing tool itself, the workpiece will not move into the spindle hole of the lathe, the clamping is stable, the use effect is excellent, the product quality is guaranteed, and the processing efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of a screw workpiece 1;

[0012] Figure 2 This is a schematic diagram of the lathe backing plate 3 before improvement;

[0013] Figure 3 A schematic diagram showing the structure of the front backing plate 3 being installed on a lathe for improvement;

[0014] Figure 4 It is a schematic diagram of the structure of the utility model;

[0015] Figure 5 It is a structural schematic diagram of the utility model installed on a lathe.

[0016] In the figure: 1. screw workpiece, 2. claw, 3. backing plate, 4. lathe spindle, 41. inner cavity; 5. tool body, 51. cavity, 52. conical section, 53. cylindrical section, 54. through hole, 55. outer conical gasket, 56. small step. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings. Figure 4 and Figure 5 An improved lathe backing tooling, the tooling body 5 is a variable diameter cylinder, the outer circumference of which is a tapered section 52, a cylindrical section 53 and a small step 56 connected in sequence, and a tapered cavity 51 is arranged inside, and the inner taper of the cavity 51 is equal to the taper of the outer tapered gasket 55. A through hole 54 is arranged at the center of the connection between the tail end of the cylindrical section 53 and the small step 56, and an outer tapered gasket 55 is installed in the cavity 51. A concave step is arranged in the middle of the outer tapered gasket 55, and a center hole is arranged in the center of the concave step, and the diameter of the center hole is smaller than the diameter of the through hole 54 and the screw workpiece 1. The tapered surface of the tapered section 52 of the outer circumference of the tooling body 5 matches the tapered surface of the inner cavity 41 of the lathe spindle 4. The diameter of the cylindrical section 53 is slightly smaller than the diameter of the straight hole section of the inner hole of the lathe spindle.

[0018] The specific method of the utility model is as follows (see Figure 4 ): First, the taper value, the large head size and the length of the tapered section of the inner cavity 41 of the lathe spindle 4 should be determined. The common taper value is about 1:20. In this way, the taper size of the tapered section 52 of the tool body 5 can be determined to match it, which is also 1:20. The purpose of this is to make the tool body withstand axial thrust with the help of the mutual cooperation between the tapered surfaces. Then, the cylindrical section 53, the through hole 54, and the small step 56 are processed on the tool body. The diameter of the cylindrical section 53 should be slightly smaller than the diameter of the straight hole section of the inner hole of the lathe spindle, which is used to facilitate the installation and removal of the tool body; the diameter of the through hole 54 should be greater than 10mm and smaller than the diameter of the small head of the cavity 51 minus 10mm, which is used to facilitate the subsequent removal of the tool body 5 from the inner cavity 41 and the removal of the outer tapered gasket 55 from the cavity 51; the purpose of setting the small step 56 is to assist the subsequent processing and molding of the tool body 5. With the existence of the step, the tool body 5 will not run inward. Finally, a cavity 51 is set in the tool body 5. The cavity 51 is also made into a conical surface, and an outer conical gasket 55 is installed in the cavity 51. The tapers of the two are the same, and the preferred taper value is 1:20. Due to the mutual cooperation between the conical surfaces, the screw workpiece 1 can be effectively supported to move inward. The number of outer conical gaskets 55 is greater than 2, and the outer diameter of each piece is different. When it cooperates with the cavity 51, the depth and position in the cavity 51 are different, thereby realizing the adjustment of the position of the screw workpiece 1 extending into the cavity 51. The outer conical gasket 55 is also provided with a center hole and a concave step. The diameter of the center hole should be smaller than the diameter of the through hole 54 and the diameter of the screw workpiece 1. The purpose of this is to facilitate the installation and knocking out of the outer conical gasket 55 without affecting the tightening of the screw workpiece 1. The purpose of setting the concave step is to assist the processing of the conical surface of the outer conical gasket 55.

[0019] The cavity 51 , the tapered section 52 , the cylindrical section 53 , the through hole 54 , and the small step 56 should be made of 45# round steel and integrally processed into a one-piece variable diameter cylinder. The outer tapered gasket 55 is separately processed with 45# round steel and together form the tooling body 5 .

[0020] The method of using the utility model is as follows (see Figure 5): When in use, first install the tool body 5 (excluding the outer conical gasket 55) into the inner cavity 41 of the lathe spindle 4, and then fit the conical section 52 with the inner conical part of the inner cavity 41 and tighten them; then put the outer conical gasket 55 into the cavity 51, and select the size of the outer conical gasket 55 according to actual needs; then place the screw workpiece 1 to be processed in the cavity 51 and press it against the outer end face of the outer conical gasket 55; then move the lathe jaws 2 toward the center line of the lathe spindle until the screw workpiece 1 in the cavity 51 is clamped. When replacing the screw workpiece 1 and adjusting the size of the outer conical gasket 55, first loosen the jaws 2 to take out the screw workpiece 1, and then use a rod with a diameter smaller than the diameter of the through hole 54 to knock out and replace the outer conical gasket 55 in the cavity 51 through the through hole 54. When the tool body 5 needs to be disassembled, it can be removed smoothly by simply using a rod with a similar diameter to knock the outer end surface of the small step 56. During the operation, it is necessary to clean the conical surface of the inner cavity 41 of the lathe spindle 4 and the inner circumferential conical surface of the cavity 51 to avoid loose fitting and loosening of the tool and workpiece.

[0021] After practical use, the improved lathe backing tooling of the utility model has significant effects. It is mainly reflected in the cutting quality and efficiency. When the lathe backing tooling improved by the utility model is used, when the workpiece is inserted into the cavity, the exposed part is reduced and the rigidity of the workpiece is increased, which solves the problems of poor rigidity, tool vibration and tool hitting in turning long screw rods and long shaft workpieces that cannot be solved by the currently used backing tooling. The cutting quality of the screw rod workpiece is good, and there are no quality defects such as cutting vibration marks. And the cutting efficiency is greatly improved. For example, it originally took 15 minutes to process a screw rod workpiece with a diameter of 30mm, a single-head wire length of 200mm, and a total length of 700mm. With the improved lathe backing tooling of this utility model, it only takes 10 minutes, and the processing efficiency is improved by 33.3%.

Claims

1. An improved lathe backing tool, characterized in that: The tooling body is a variable diameter cylinder, whose outer circumference is a conical section, a cylindrical section and a small step connected in sequence, a conical cavity is arranged inside, a through hole is arranged at the center of the connection between the tail end of the cylindrical section and the small step, an outer conical gasket is installed in the cavity, a concave step is arranged in the middle of the outer conical gasket, and a center hole is arranged in the center of the concave step.

2. The improved lathe backing tooling according to claim 1, characterized in that: The conical surface of the outer peripheral conical section of the tool body matches the inner cavity conical surface of the lathe spindle.

3. The improved lathe backing tooling according to claim 1, characterized in that: The inner circumference taper of the cavity is equal to the taper of the outer conical gasket.

4. The improved lathe backing tooling according to claim 1, characterized in that: The diameter of the cylindrical section is slightly smaller than the diameter of the straight hole section of the inner hole of the lathe spindle.

5. The improved lathe backing tooling according to claim 1, characterized in that: The diameter of the central hole of the outer conical gasket is smaller than the diameters of the through hole and the screw workpiece.

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