Center calibration tool and method for centerless lathe for round steel turning

Abstract

The invention discloses a centerless lathe center calibration tool and method for round steel turning, and belongs to the technical field of centerless lathe calibration. The calibration tool comprises a calibration rod and a positioning disc, wherein the center of the positioning disc is provided with a positioning hole with the same diameter as the calibration rod, and the outer ring diameter of the positioning disc is the same as the outlet diameter of the middle and rear guide device. The calibration tool is simple in structure and convenient to operate, and calibration of a front centering wheel set, a rear orientation wheel set and a rear clamping device of a front clamping and conveying device, a middle guide device and a rear guide device of the centerless lathe can be rapidly and accurately achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centerless lathe calibration, in particular to a center calibration tool and method for centerless lathe for turning round steel. BACKGROUND

[0002] In the production process of round steel special steel bar, it is common to use a centerless lathe to realize surface turning of the round steel bar. The round steel is turned into a conveying roller by a material turning mechanism, then clamped and sent into a front guide by a clamping roller, and then adjusted in centering by a front guide device to enter a turning main machine after the centering of the end of the round steel and the center of the cutter head. The cutter head drives the turning tool installed on the cutter head to rotate at high speed to turn the surface of the round steel. Then the clamping roller continuously clamps and sends the round steel forward, and the turned round steel enters a middle and rear guide centering device to ensure the stability of the round steel before and after the turning tool. When the tail of the round steel is about to be separated from the clamping roller, the rear clamping device of the centerless lathe operates to clamp the round steel and drives the rear clamping device to move forward at the same speed as the clamping roller by a screw rod mechanism, so as to avoid the loss of forward driving force and stability of the round steel. After the round steel is completely turned, the rear clamping device releases the round steel, the screw rod reverses and returns to the initial position, and the round steel is transported by the conveying roller and then enters the collection groove to complete the turning. After a long period of operation of the centerless lathe, due to problems such as excessive bending and ovality of the raw material, vibration of the equipment in operation, etc., the center of the front clamping device, the front centering wheel group of the middle and rear guide device, the rear directional wheel group and the rear clamping device will deviate, resulting in that the front, middle and rear centers of the equipment are not on the same straight line. This will cause the round steel to bend after turning or the turning center to deviate, resulting in different turning thicknesses of the round steel at different angles, and the surface turning of the deviated turning part will not be clean. In the related art, the eccentric adjustment of the front clamping device, the front centering wheel group of the middle and rear guide device, the rear directional wheel group and the rear clamping device of the centerless lathe is realized by manual observation. However, the center calibration adjustment precision of this method is low and the effect is poor. SUMMARY

[0003] The purpose of the present application is to provide a center calibration tool and method for centerless lathe for turning round steel, which solves the problem of low calibration adjustment precision and poor effect of the center calibration method of the centerless lathe in the related art.

[0004] To solve the above technical problems, the present application is realized by adopting the following technical scheme:

[0005] On the one hand, the present application provides a center calibration tool for centerless lathe for turning round steel, which comprises:

[0006] A calibration rod and a positioning disc, wherein the center of the positioning disc has a positioning hole with the same diameter as the calibration rod, and the outer diameter of the positioning disc is the same as the outlet diameter of the middle and rear guide device.

[0007] Optionally, the calibration rod comprises: a first calibration rod and a second calibration rod, and the first calibration rod has the same diameter as the second calibration rod.

[0008] Optionally, the positioning disc has a limiting disc on the outer ring.

[0009] Optionally, the first calibration rod has a length of 1.5 m, an outer diameter of 100 mm, an inner diameter of 60 mm, and a wall thickness of 20 mm.

[0010] The second calibration rod has a length of 2 m, an outer diameter of 100 mm, an inner diameter of 60 mm, and a wall thickness of 20 mm.

[0011] The outer ring of the positioning disc has a diameter of 185 mm, the positioning hole has a diameter of 100 mm, the outer ring of the limiting disc has a diameter of 175 mm, the positioning disc has a thickness of 24 mm, and the limiting disc has a thickness of 16 mm.

[0012] Optionally, the first calibration rod and the second calibration rod have a bending degree of not more than 0.03%.

[0013] In another aspect, the application provides a center calibration method for turning of round steel on a centerless lathe, and the calibration method is implemented by using the calibration tool.

[0014] The rear guide device and the cutter on the main cutter head are removed;

[0015] The second calibration rod is clamped by the front centering wheel set, the positioning disc is sleeved on the second calibration rod, and the positioning disc is clamped in the outlet of the rear centering wheel set;

[0016] The eccentricity of the second calibration rod is measured based on the center of the main cutter head, and the front centering wheel set is adjusted in position according to the eccentricity, so that the front centering wheel set is coaxial with the main cutter head;

[0017] The positioning disc is taken out of the outlet, the second calibration rod is clamped by the rear centering wheel set, the deviation direction of the positioning disc is observed based on the outlet, and the rear centering wheel set is adjusted in position according to the deviation direction, so that the positioning disc is coaxial with the outlet;

[0018] The first calibration rod is clamped by the pinch roll, and the first end of the first calibration rod is connected to the second end of the second calibration rod;

[0019] The base and parallel mechanism of the front pinch device are adjusted, so that the first calibration rod is coaxial with the second calibration rod;

[0020] The first calibration rod is clamped by the rear pinch device, and the second end of the first calibration rod is connected to the first end of the second calibration rod;

[0021] Adjusting the adjusting bolt of the base of the rear clamping device to make the first calibration rod coaxial with the second calibration rod.

[0022] Optionally, before the second calibration rod is clamped by the front centering wheel set and the positioning disc is sleeved on the second calibration rod and clamped in the outlet of the rear guide device, the method further comprises: loosening the centering wheel of the second orientation wheel set.

[0023] Optionally, the eccentricity of the second calibration rod is measured based on the main machine cutter head, and the position of the front centering wheel set is adjusted according to the eccentricity, so that the second calibration rod is coaxial with the main machine cutter head, which comprises: a dial gauge is arranged on the main machine cutter head, the plunger of the dial gauge is positioned on the surface of the calibration rod, the eccentricity of the second calibration rod relative to the center of the main machine cutter head is measured by rotating the cutter head, and the position of the centering wheel in the front centering wheel set is adjusted according to the eccentricity, so that the second calibration rod is coaxial with the main machine cutter head.

[0024] Optionally, when the calibration rod is clamped by the front centering wheel set, the first end of the second calibration rod protrudes from the outlet of the main machine by 30 mm, and the second end of the second calibration rod protrudes from the inlet of the main machine by 30 mm.

[0025] Compared with the prior art, the application has the following beneficial effects: the positioning disc is sleeved on the second calibration rod and clamped in the outlet of the rear guide device, and the second calibration rod is clamped by the front centering wheel set, so that the position of the second calibration rod is fixed by two fixing points. Among them, the rear center of the second calibration rod in the main machine is positioned by the positioning disc, and the front center of the second calibration rod at the position of the front centering wheel set is in an eccentric state based on the center of the positioning disc. The eccentricity of the second calibration rod is measured, and the position of the front centering wheel set is adjusted according to the eccentricity, so that the calibration of the front centering wheel set is completed.

[0026] The front center of the second calibration rod is positioned by the front centering wheel set, and the rear center of the second calibration rod is positioned by the rear centering wheel set. Among them, the rear center of the second calibration rod at the position of the rear centering wheel set is in an eccentric state based on the positioning center of the front centering wheel set. The positioning disc is sleeved on the rear position of the second calibration rod, and the outer periphery deviates from the inner periphery of the outlet of the rear guide device. The position of the rear centering wheel set is adjusted by observing the deviation direction of the positioning disc relative to the outlet, so that the positioning disc is coaxial with the outlet, so that the calibration of the rear centering wheel set can be realized.

[0027] After the calibration of the front and rear centering wheel sets is completed, the second calibration rod is in the center position of the centerless lathe. At this time, the first calibration rod is connected with the second calibration rod by clamping the first calibration rod with the front clamping device. The base and parallel mechanism of the front clamping device are adjusted with the second calibration rod as the center reference, so that the first calibration rod is coaxial with the second calibration rod, thereby completing the calibration of the front clamping device.

[0028] The first calibration rod is connected with the second calibration rod by clamping the first calibration rod with the rear clamping device. The adjusting screw of the base of the rear clamping device is adjusted with the second calibration rod as the center reference, so that the first calibration rod is coaxial with the second calibration rod, thereby completing the calibration of the rear clamping device.

[0029] The calibration tool of the present application has simple structure and convenient operation, and can quickly and accurately calibrate the front clamping device, the front centering wheel set of the middle and rear guide device, the rear centering wheel set and the rear clamping device of the centerless lathe. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Figure 1 is a positioning disc structure schematic diagram of some embodiments provided by the present application;

[0032] Figure 2 is a first calibration rod structure schematic diagram of some embodiments provided by the present application;

[0033] Figure 3 is a second calibration rod structure schematic diagram of some embodiments provided by the present application.

[0034] Legend of the drawings: 1-positioning disc; 2-first calibration rod; 3-second calibration rod; 11-positioning hole; 12-limiting disc. DETAILED DESCRIPTION

[0035] The technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present disclosure / the present application, not all. The description of the at least one exemplary embodiment below is actually only illustrative, and is by no means any limitation on the present application and its application or use.

[0036] In the surface turning process of round steel bar by using a centerless lathe, the round steel is turned into a conveying roller by a material turning mechanism, and then is clamped and sent into a front guide by a clamping and sending roller. After the round steel end is adjusted to be centered with the center of a cutter head by a front guide device, the round steel enters a turning main machine. The cutter head drives a turning tool mounted on the cutter head to rotate at a high speed to turn the surface of the round steel. Then the clamping and sending roller continuously clamps and sends the round steel forward, and the turned round steel enters a centering device of a middle and rear guide to ensure the stability of the round steel before and after the turning tool. When the tail of the round steel is about to be separated from the clamping and sending roller, the rear clamping device of the centerless lathe operates to clamp the round steel and drives the rear clamping device to clamp the round steel forward at the same forward speed of the clamping and sending roller by a screw rod mechanism, so as to avoid the loss of forward power and stability of the round steel. After the round steel is completely turned, the rear clamping device releases the round steel after the round steel leaves the position of the cutter head, the screw rod is reversed and returns to the initial position, and the round steel is transmitted by the conveying roller and then enters a collecting groove to complete the turning. After the centerless lathe is operated for a long time, due to problems such as excessive bending degree and ovality of raw materials, vibration of equipment operation and the like, deviations may occur in the centers of the front clamping and sending device, the front centering wheel group and the rear directional wheel group of the middle and rear guide device and the center of the rear clamping device, which leads to the fact that the centers of the front, middle and rear of the equipment are not on the same straight line. This will lead to the fact that the turned round steel is bent or the turning center deviates, which causes the thickness of the round steel to be different at different angle directions, and the surface turning of the deviated turning part is not clean. A center calibration tool and method for round steel turning centerless lathe of the application are used for calibrating the centers of the front clamping and sending device, the front centering wheel group and the rear directional wheel group of the middle and rear guide device and the rear clamping device of the centerless lathe, and realizing the center calibration of the centerless lathe. The following will be described in combination with specific embodiments.

[0037] Embodiment 1

[0038] This embodiment introduces a center calibration tool for round steel turning centerless lathe, which is used for calibrating the centers of the front clamping and sending device, the front centering wheel group and the rear directional wheel group of the middle and rear guide device and the rear clamping device of the centerless lathe. Figure 1 and Figure 2 The center calibration tool for round steel turning centerless lathe in this embodiment includes a calibration rod and a positioning disc 1. The center of the positioning disc 1 has a positioning hole 11 with the same diameter as the calibration rod, so as to be adapted to be sleeved on the calibration rod. The outer diameter of the positioning disc 1 is the same as the outlet diameter of the middle and rear guide device, so as to be adapted to be clamped with the outlet of the middle and rear guide device. In this embodiment, the calibration rod includes a first calibration rod 2 and a second calibration rod 3, and the diameters of the first calibration rod 2 and the second calibration rod 3 are the same.

[0039] Embodiment 2

[0040] The center calibration tool for turning round steel on a centerless lathe in this embodiment is based on the same inventive concept as that in Embodiment 1 and comprises a calibration rod and a positioning disc 1. The center of the positioning disc 1 has a positioning hole 11 with the same diameter as the calibration rod to be fitted on the calibration rod. The outer ring of the positioning disc 1 has the same diameter as the outlet of the rear guide device to be clamped to the outlet of the rear guide device. The positioning disc 1 has a limiting disc 12 on the outer ring. The limiting disc 12 can limit the axial movement of the positioning disc 1 after being clamped to the outlet of the rear guide device and facilitate the subsequent removal of the positioning disc 1.

[0041] Further, in this embodiment, the calibration rod comprises a first calibration rod 2 and a second calibration rod 3. The first calibration rod 2 and the second calibration rod 3 are tubular structures. The first calibration rod 2 has a length of 1.5 m, an outer diameter of 100 mm, an inner diameter of 60 mm, and a wall thickness of 20 mm. The second calibration rod 3 has a length of 2 m, an outer diameter of 100 mm, an inner diameter of 60 mm, and a wall thickness of 20 mm. The outer ring of the positioning disc 1 has a diameter of 185 mm, the positioning hole 11 has a diameter of 100 mm, the outer ring of the limiting disc 12 has a diameter of 175 mm, the positioning disc 1 has a thickness of 24 mm, and the limiting disc 12 has a thickness of 16 mm. It should be noted that the first calibration rod and the second calibration rod may be bent and deformed after long-term use. In order to ensure calibration accuracy, the bending degree of the first calibration rod and the second calibration rod should be not greater than 0.03% in this embodiment.

[0042] Embodiment 3

[0043] This embodiment introduces a center calibration method for turning round steel on a centerless lathe. The calibration method is implemented by the calibration tool in Embodiment 2 and comprises the following steps:

[0044] S100, remove the tool on the rear guide device and the main machine tool disc;

[0045] The tool on the rear guide device and the main machine tool disc is removed before calibration to create conditions for the subsequent installation of the calibration rod. In some embodiments, after the tool on the rear guide device and the main machine tool disc is removed, the rear center wheel set is also loosened by the handle to facilitate subsequent adjustment.

[0046] S200, clamp the second calibration rod 3 by the front center wheel set, fit the positioning disc 1 on the second calibration rod 3, and clamp the positioning disc 1 in the outlet of the rear guide device;

[0047] In this embodiment, the positioning disc 1 is fitted on the second calibration rod 3 and clamped in the outlet of the rear guide device, and the second calibration rod 3 is clamped by the front center wheel set, so that the position of the second calibration rod 3 is fixed by two fixed points. The rear center of the second calibration rod 3 is positioned by the positioning disc 1 in the main machine, and the front center of the second calibration rod 3 at the position of the front center wheel set is in an eccentric state with the center of the positioning disc 1 as the reference.

[0048] In some embodiments, when the second calibration rod 3 is clamped by the front centering wheel set, the first end of the second calibration rod 3 protrudes 30mm from the outlet of the main machine, and the second end of the second calibration rod 3 protrudes 30mm from the inlet of the main machine.

[0049] S300, measure the eccentricity value of the second calibration rod 3 with the center of the main machine tool chuck as the reference, and adjust the position of the front centering wheel set according to the eccentricity value, so that the front centering wheel set is coaxial with the main machine tool chuck;

[0050] Wherein, including: setting a dial gauge on the main machine tool chuck, setting the dial gauge needle on the surface of the second calibration rod 3, and measuring the eccentricity value of the second calibration rod 3 relative to the center of the main machine tool chuck by rotating the chuck. According to the eccentricity value, the position of the centering wheel in the front centering wheel set is adjusted so that the second calibration rod 3 is coaxial with the main machine tool chuck, thereby completing the calibration of the front centering wheel set.

[0051] S400, take out the positioning disc 1 from the outlet, clamp the second calibration rod 3 through the rear centering wheel set, and observe the deviation direction of the positioning disc 1 from the outlet, and adjust the position of the rear centering wheel set according to the deviation direction, so that the positioning disc 1 is coaxial with the outlet.

[0052] Wherein, the front center of the second calibration rod is positioned by the front centering wheel set, and the rear center of the second calibration rod 3 is positioned by the rear centering wheel set. Wherein, taking the positioning center of the front centering wheel set as the reference, the rear center of the second calibration rod 3 at the position of the rear centering wheel set is in an eccentric state. The positioning disc 1 is sleeved on the rear position of the second calibration rod 3 after being taken out, and the outer periphery thereof deviates from the inner periphery of the outlet of the middle and rear guide device. By observing the deviation direction of the positioning disc 1 relative to the outlet, the position of the rear centering wheel set is adjusted so that the positioning disc 1 is coaxial with the outlet, thereby realizing the calibration of the rear centering wheel set.

[0053] S500, clamp the first calibration rod 2 with the pinch roll, and connect the first end of the first calibration rod 2 with the second end of the second calibration rod 3;

[0054] S600, adjust the base and parallel mechanism of the front pinch device so that the first calibration rod 2 is coaxial with the second calibration rod 3;

[0055] After the calibration of the front centering wheel set and the rear centering wheel set is completed, the second calibration rod 3 is at the center position of the centerless lathe. At this time, the first calibration rod 2 is connected with the second end of the second calibration rod 3 by clamping the first calibration rod 2 with the pinch roll. Taking the second calibration rod 3 as the center reference, the base and parallel mechanism of the front pinch device are adjusted so that the first calibration rod 2 is coaxial with the second calibration rod 3, thereby completing the calibration of the front pinch device.

[0056] S700, clamping the first calibration rod 2 by the rear clamping device, and connecting the second end of the first calibration rod 2 with the first end of the second calibration rod 3;

[0057] S800, adjusting the adjusting screw of the base of the rear clamping device, so that the first calibration rod 2 is coaxial with the second calibration rod 3.

[0058] The first calibration rod 2 is clamped by the rear clamping device, and the second end of the first calibration rod 2 is connected with the first end of the second calibration rod 3. The adjusting screw of the base of the rear clamping device is adjusted with the second calibration rod 3 as the center reference, so that the first calibration rod 2 is coaxial with the second calibration rod 3, thereby completing the calibration of the rear clamping device. It should be noted that the calibration of the front clamping device and the rear clamping device in the embodiment has no sequence requirement. In some embodiments, the first calibration rod 2 has two, and the front clamping device and the rear clamping device can be calibrated simultaneously.

[0059] The above only describes the preferred embodiments of the present application. It should be noted that for those skilled in the art, without departing from the technical principles of the present disclosure / the present application, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present disclosure / the present application.

Claims

1. A center calibration tool for centerless lathes used in turning round steel bars, characterized in that, include: A calibration rod and a positioning disk; wherein the positioning disk has a positioning hole at its center with the same diameter as the calibration rod, and the outer diameter of the positioning disk is the same as the outlet diameter of the mid-rear guide device.

2. The center calibration tool for centerless lathe machining of round steel according to claim 1, characterized in that, The calibration rod includes a first calibration rod and a second calibration rod, wherein the first calibration rod and the second calibration rod have the same diameter.

3. The center calibration tool for centerless lathe machining of round steel according to claim 2, characterized in that, The positioning disk has a limiting disk on its outer ring.

4. The center calibration tool for centerless lathe machining of round steel according to claim 3, characterized in that, The first calibration rod is 1.5m long, 100mm in outer diameter, 60mm in inner diameter, and 20mm thick. The second calibration rod is 2m long, 100mm in outer diameter, 60mm in inner diameter, and 20mm thick. The outer diameter of the positioning disk is 185mm, the diameter of the positioning hole is 100mm, the outer diameter of the limiting disk is 175mm, the thickness of the positioning disk is 24mm, and the thickness of the limiting disk is 16mm.

5. The center calibration tool for centerless lathe machining of round steel according to claim 4, characterized in that, The curvature of both the first calibration rod and the second calibration rod is no greater than 0.03%.

6. A method for center calibration on a centerless lathe for turning round steel bars, characterized in that, The calibration method, implemented using the calibration tool described in claims 2-5, comprises: Remove the cutting tools from the rear guide device and the main cutter head; The positioning disc is fitted onto the second calibration bar by clamping the front centering wheel assembly, and then snapped into the outlet of the middle and rear guide device. The eccentricity value of the second calibration bar is measured with the center of the main cutter head as a reference, and the position of the front centering wheel group is adjusted according to the eccentricity value so that the front centering wheel group is coaxial with the main cutter head; Remove the positioning disc from the outlet, clamp the second calibration bar with the rear centering wheel assembly, observe the deviation direction of the positioning disc with the outlet as a reference, and adjust the position of the rear centering wheel assembly according to the deviation direction so that the positioning disc is coaxial with the outlet; The pinch roller clamps the first calibration bar so that the first end of the first calibration bar is connected to the second end of the second calibration bar; Adjust the base and parallel mechanism of the front clamping device to make the first calibration bar and the second calibration bar coaxial; The rear clamping device clamps the first calibration bar so that the second end of the first calibration bar is connected to the first end of the second calibration bar. Adjust the adjusting bolts on the base of the rear clamping device to make the first calibration bar and the second calibration bar coaxial.

7. The method for center calibration of a centerless lathe for turning round steel according to claim 6, characterized in that, After the cutting tools on the rear guide device and the main cutter head are removed, before the second calibration bar is clamped by the front centering wheel group, the positioning plate is sleeved on the calibration bar, and it is locked into the outlet of the middle and rear guide device, the method further includes: loosening the centering wheel of the second orientation wheel group.

8. The method for center calibration of a centerless lathe for turning round steel according to claim 6, characterized in that, The step of measuring the eccentricity value of the second calibration bar using the main cutter head as a reference, and adjusting the position of the first front centering wheel assembly according to the eccentricity value so that the second calibration bar is coaxial with the main cutter head, includes: setting a dial indicator on the main cutter head, fixing the dial indicator pin to the surface of the second calibration bar, measuring the eccentricity value of the second calibration bar relative to the center of the main cutter head by rotating the cutter head, and adjusting the position of the centering wheel in the front centering wheel assembly according to the eccentricity value so that the second calibration bar is coaxial with the main cutter head.

9. The method for center calibration of a centerless lathe for turning round steel according to claim 6, characterized in that, When the second calibration bar is clamped by the front centering wheel assembly, the first end of the second calibration bar protrudes 30mm from the outlet of the main unit, and the second end of the second calibration bar protrudes 30mm from the inlet of the main unit.

Images