KR20010002291A - A nut tapping system - Google Patents

Abstract

PURPOSE: A nut tapping system is provided to prevent the runout of a tap bar rotating at high speed, thereby precisely performing the tapping operation of a nut. CONSTITUTION: A nut tapping system includes a tap bar(20) having a tap formed in a front end, a unit in which the rear end part and for rotating the tap bar, and a vibration preventing apparatus(30) installed between the unit and the front end of the tap bar and keeping the center of rotation of the tap bar rotating for tapping machining of the nut, wherein the vibration preventing apparatus includes a frame(32) having a center hole for locating the tap bar, rollers(34) supporting the tap bar, and cylinders(36) supported by the frame and connected with the rollers for moving the rollers up and down to contact the rollers with the tap bar or separate the rollers from the tap bar.

Description

Nut tapping system {A NUT TAPPING SYSTEM}

The present invention relates to a nut tapping system, and more particularly to a nut tapping system in which a rotating tap bar for machining the female thread of the nut is concentric.

As shown in FIGS. 1 and 2, the conventional nut tapping device 100 includes a tab rod 110, a clamp 120, a rotation means 130, and a pusher means 140. The tapping operation of the nut in the conventional nut tapping device 100 is performed as follows. First, the nut 120 for processing is placed in the clamp 120. The clamp 120 slides toward the tip of the tab rod 110 by the pusher means 140. The tab rod 110 is rotated at a high speed by the rotation means 130. In this state, while the nut 160 passes through the tab 112 of the tab rod 110, the internal thread of the nut 160 is processed. On the other hand, the processed nut 160 passing through the tab 112 of the tab rod is moved along the shank portion 114 of the tab rod to exit through the vent portion 116 formed at the end of the shank portion 114. do.

At this time, only when the tolerance (a) between the nut 160 fitted to the tab rod 110 and the inner diameter of the sleeve 132 of the rotating means is large, the movement of the nuts 160 is smoothly performed on the sleeve 132. .

However, as shown in FIG. 2, the tab rod 110 is rotated while being shaken without concentricity at high speed due to the tolerance (a), and eventually tapping the nut 160 due to the shaking of the tab rod 110. The problem arises that the precision (rightness) of the is lowered. Unexplained symbol "b" indicates the axis of rotation of the tab rod. For example, the larger the tolerance (a), the larger the shaking of the high-speed rotation of the tab rod (110) is the greater the cause of lowering the precision of the nut (160). On the contrary, if the tolerance (a) is too small, the movement of the nuts 160 on the sleeve 132 may not be performed smoothly.

As described above, when processing the nut 160 in the conventional nut tapping device 100, the tapping rod 110, which is the most important cutting tool, is rotated while being shaken without concentricity, and thus the tapping operation of the nut is not precisely performed.

On the other hand, the processed nut 160 passing through the tab 112 of the tab rod 110 is moved along the shank portion 114 of the tab rod to exit through the vent portion 116 formed at the end of the shank portion. . At this time, the nut 160 exiting through the bent part 116 of the tab rod 110 is thrown out in various directions by the rotational force of the tab rod 110, the product is hit the machine frame and the appearance is damaged have.

The present invention is to solve such a conventional problem, an object of the present invention is to provide a nut tapping system of a new type that can prevent the shaking of the tab bar to rotate at high speed.

1 shows a conventional nut tapping device;

2 is a view for explaining a state that the tab bar is rotated while being shaken without forming a concentric in the conventional nut tapping device;

3 shows a nut tapping device according to an embodiment of the invention;

4 is a view schematically showing an installation state of an anti-vibration device in the nut tapping device of FIG. 3;

5A and 5B are perspective and exploded perspective views of the anti-vibration device shown in FIG. 4;

6a and 6b are views showing the operating state of the vibration damping device;

7 is a schematic plan view of a nut tapping device according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

10: Nut Tapping Device 12: Hopper

20: tab rod 22: tab portion

24: Shank portion 26: Bent portion

30: vibration preventing device 32: frame

32a: center hole 34: roller

36: cylinder 36a: cylinder rod

38: connecting rod 40: rotation means

42: rotating body 44: bearing

46: sleeve 46a: through hole

50: clamp 60: nut pushing device

80: system control unit 90: nut

According to a feature of the present invention for achieving the above object, the nut tapping system of the present invention includes: a tab rod having a tab formed at a front end thereof; Means for inserting a rear end of the tab rod and rotating the tab rod; And a vibration preventing device provided between the rotating means and the tip of the tab bar to hold a center of rotation of the tab bar that rotates for tapping processing of the nut.

In the present invention as described above, the vibration preventing device includes a frame having a center hole in which the tab rod is formed; Rollers supporting three points of the tab rod positioned in the center hole; Cylinders supported by the frame and connected to the rollers for lifting and lowering the rollers such that the rollers are in contact with / away from the tab rods.

According to the nut tapping system of the present invention, the vibration preventing device is to hold the rotation center of the tab bar to rotate at high speed can prevent the tab bar shake. The tapping of the nut is therefore very precise.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 3 to 7. In the drawings, components that perform the same function are denoted by the same reference numerals.

3 is a view showing a nut tapping device according to an embodiment of the present invention. 4 is a view schematically showing an installation state of the vibration preventing device in the nut tapping device of FIG. 7 is a schematic plan view of a nut tapping device according to an embodiment of the present invention.

3 and 4, the nut tapping device according to an embodiment of the present invention is a vibration preventing device 30 for supporting the three points of the tab rod 20 to hold the center of rotation of the high-speed rotation of the tab rod 20 Have

In addition, the nut tapping device 10 is installed so that the means 40 for rotating the tab rod 20 and the untapped nut 90 are mounted and reciprocated in the front-rear direction from the front end of the tab rod 20. And a nut pushing device 60 for pushing the clamp 50 toward the tab rod 20.

Referring to FIGS. 3 and 7, the rotation means 40 includes the rotor 42 and the rotor 42 including the pulley 42a and the boss 42b that receive the driving force of the motor 48 by the belt 48a. It consists of a bearing 44 supporting the whole 42 and a sleeve 46 fitted to the tip of the boss 42b and rotating together with the rotor 42. For example, the components other than the sleeve 46 in the rotating means 40 are commonly used in the nut tapping device, and the parts of the components are omitted in FIGS. 4 to 7. When the sleeve 46 has a through hole 46a having an inner diameter larger than the diameter of the nut 90 fitted to the tab bar 20, a portion of the tab bar 20 is fitted into the through hole 46a. Meanwhile, the tab rod 20 has a shank portion 24 through which a tab portion 22 for processing a female thread and a processed nut are inserted into the tip end, and a shank positioned in the through hole 46a of the sleeve 46. It consists of a bent part 26 formed in a part of the part 24. 3 and 4, the through hole 46a of the sleeve 46 has a curved portion 46b corresponding to the vent part 26 of the tab rod. The tab rod 20 is rotated together with the sleeve 46 that is rotated by the vent part 26. For example, in the nut tapping device 10 of the present invention, it may be replaced with another sleeve and a tab rod according to the kind of the nut for tapping. The tab bar 20 does not achieve concentricity at high speed rotation due to a tolerance (a) between the inner diameter of the through-hole of the sleeve and the nut fitted to the tab bar, and shake occurs.

4 to 5B, the most important vibration preventing device 30 in the nut tapping device 10 is to grasp the rotation center of the high-speed rotating tap bar 20 during the tapping process of the nut 90. It is installed between the tab portion 22 and the sleeve 46 of the tab rod 20. The anti-vibration device 30 supports three points of the tab bar 20, which is not concentric at high speed, due to the tolerance (a) between the inner diameter of the through-hole of the sleeve 46 and the nut fitted to the tab bar, thereby preventing the shaking. You can prevent it. That is, as the tab rod 20 is rotated concentrically, the tapping operation of the nut 90 may be made very precisely.

5A and 5B, the vibration preventing device 30 includes a frame 32 and cylinders 36 to which a roller 34 is connected at one end thereof. The cylinder 36 is composed of a cylinder rod 36a and a roller 34 and a connecting rod 38 connecting the cylinder rod 36a and the roller 34. The cylinders 36 are each positioned at 120 degree intervals on the outer circumferential surface of the frame 32 and are fixed to the frame 32 by screws. The frame 32 is formed by penetrating the center hole 32a in which the tab rod 20 is located at the center and the center hole 32a from the outer surface of the frame 32 in which the cylinder 36 is located. Have 32b. The cylinder rod 36a, the connecting rod 38, and the roller 34 are positioned on the hole 32b. The cylinder 36 is composed of a pneumatic or hydraulic cylinder for moving the rollers 34 back and forth so as to contact / space the roller 34 to / from the tab rod 20 located in the center hole 32a. The cylinder 36, operated according to whether pneumatic or hydraulic pressure is applied, is controlled by a compressor or a hydraulic system. Meanwhile, in the nut tapping device 10, the cylinder 36, the nut pushing device 60, the motor 48, and the like are controlled by a system controller (shown in FIG. 7) 80.

6a and 6b are views showing an operating state of the vibration preventing device. Referring to this, during tapping of the nut 90, the rollers 34 support the tab rod 20 by three points to hold the center of rotation of the tab rod 20 that rotates at high speed, as shown in FIG. 6A. When the tapping of one nut 90 is completed, the rollers 34 may be moved from the tab bar 20 so that the tapped nut 90 may be moved to the rear end of the tab bar 20 through the center hole 32a. The vibration preventing device 30 automatically repeats the above-described operation while the operation of the nut tapping device 10 is continued.

The vibration preventing device 30 may be installed on the machine frame of the nut tapping device 10 by the support 70. For example, the support 70 supporting the vibration preventing device 30 may be integrally formed with the frame 32. This has the effect of reducing the number of components and can improve the durability of the device.

The nut tapping device 10 of the present invention can be applied to a nut tapping device of two axes, four axes or more as well as a nut tapping device of one axis.

Referring to the operating state of the nut tapping device of the present invention made as described above are as follows.

3 to 7, the untapped nut 90 is placed at a fixed position of the clamp 50 along the guide 12a of the hopper 12. The clamp 50 is moved toward the tip of the tab rod 20 by the nut pushing device 60 which is hydraulically operated. The tab rod is rotated at high speed by the rotating means. The anti-vibration device 30 supports the tab rod 20 by three points to hold the center of rotation of the tab rod 20 to prevent the tab rod 20 from shaking. (See FIG. 6A). The nut 90 is tapped while passing through the tab portion 22 of the tab rod 20. When the tapping of the nut 90 is completed, the rollers 34 are spaced apart from the tap rod 20 by the reverse operation of the cylinder 36 (see FIG. 6B). Then, the tapping of the nut 90 is completed. It is moved to the rear end of the tab rod 90 through the open center hole 32a of (32). On the other hand, the clamp 50 is moved back to its initial position and a new, non-tapped nut is placed at the fixed position of the clamp 50 again. As such, the nut tapping device 10 repeatedly performs the nut tapping operation by the above-described method. On the other hand, the tapped nut 90 passes through the shank portion 24 and the bent portion 24 of the tab rod 20 and exits from the end of the tab rod 20. At this time, since the end of the tab rod 20 is formed in a straight line in the same manner as the rotation center, the nut 20 is not thrown out in various directions and is aligned without rotational force so as to be pulled out in a straight line. Therefore, it is possible to solve the problem that the nut 90 is damaged and the appearance is damaged by hitting the machine frame.

In the above, the configuration and operation of the nut tapping device according to the present invention is shown in accordance with the above description and drawings, but this is only described for example, and various changes and modifications are possible within the scope without departing from the technical spirit of the present invention. Of course.

Applying the present invention, since the tapped nuts which are separated from the end of the tab bar is aligned without the rotation force falls down, it is possible to prevent damage to the appearance when dropped by the rotation force from the bent end of the existing tab bar.

In particular, since the tab rod is rotated in the state supported by the three-point vibration preventing device, the high-speed rotation is made stable without shaking, there is an effect that can process the female thread of the nut more accurate. In other words, the vibration preventing device improves the precision such as the squareness and concentricity of the tapping process.

Claims (2)

In a nut tapping system: A tab rod with a tab formed at the tip; Means for inserting a rear end of the tab rod and rotating the tab rod; And a vibration preventing device installed between the rotating means and the tip of the tab bar to hold a rotation center of the tab bar that rotates for tapping processing of the nut. The method of claim 1, The vibration preventing device A frame having a center hole in which the tab rod is located; Rollers for supporting three points of the tab rod positioned in the center hole; Cylinders supported by the frame and connected to the rollers for lifting and lowering the rollers such that the rollers are in contact with / distance from the tab rod, And the rollers are spaced apart from the tab bar so that the rollers support the tab bar when the nut is tapped and the processed nut is moved to the rear end of the tab bar when the nut is finished.