Soft jaw boring machine

Abstract

The present invention is a boring device for machining the soft jaws of a lathe, characterized in that it comprises a boring adjustment plate that forms a spiral protrusion surface on the edge of a disk, and a jaw stopper portion that has the same diameter as the spiral protrusion surface of the boring adjustment plate and is in surface contact with the spiral protrusion surface of the boring adjustment plate, and is connected to the bolt hole of the soft jaw to control the movement of the soft jaw.The jaw stopper portion moves along the surface of the spiral protrusion surface while maintaining contact as the boring adjustment plate rotates left and right, thereby controlling the movement of the soft jaw.

Description

[Technical Field]

[0001] The present invention relates to a soft jaw fixing device for a lathe chuck that is installed on a machine tool such as a CNC lathe or a multi-tasking machine and that fixes the soft jaws so that the soft jaws can be machined according to the size of the workpiece. The present invention also relates to a device that is installed on the top of the soft jaws and can be easily adjusted to a desired size, for conveniently fixing the soft jaws.

[0002] The present invention also relates to a boring device for soft jaw machining, which processes the inner diameter of the soft jaw so that it comes into precise contact with the workpiece in order to safely grip the workpiece in an accurate concentric manner when using a CNC lathe. [Background technology]

[0003] Generally, a lathe chuck is a device that firmly fixes a workpiece that cannot be supported at the center by a machine tool such as a lathe or milling machine using soft jaws. The lathe chuck is equipped with a number of slidable master jaws, and a soft jaw is installed on top of each master jaw, so that the soft jaws tightly securely fix the workpiece.

[0004] The soft jaws coupled with the master jaws have arc-shaped rounded surfaces that precisely fit the outer diameter of the workpiece to fix it and prevent runout or vibration during machining, and the rounded surfaces of the soft jaws must be machined according to the size of the workpiece. However, since the rounded surfaces of the soft jaws need to vary depending on the size of the workpiece, the rounded surfaces of the soft jaws must be machined in a variety of ways and with precision.

[0005] As a prior art, Korean Patent Publication No. 2000-0063591 entitled "Jaw Fixing Device for Machining Jaws of a Lathe Chuck" is known.

[0006] FIG. 1 is an exploded perspective view of a jaw fixing device for machining the jaws of a lathe chuck according to the prior art, and FIG. 2 is a view showing the state in which the jaws and the engaging plates are fixed according to the prior art.

[0007] In this prior art, round grooves 8, 8' are formed on the outer diameter of the mating plate 30 to engage with the annular protrusion 20 formed on the head of the cap screw 2 coupled to the soft jaw 1, and the inner circumference of the triangularly arranged soft jaw 1 is determined by the depth of the round grooves 8, 8' of the mating plate 30. Therefore, multiple sets of different depths formed on the mating plate 30 can be fixed to different inner circumferences. Ultimately, the number of processes is determined by the number of round grooves 8, 8' formed on the mating plate 30, which is very restrictive.

[0008] In addition, since the engagement plate (30) has a round groove formed on its outer diameter and is fixed in place by tightly fitting it to the annular protrusion of the cap screw, the force tightening the master jaw (4) to the center causes the annular protrusion (20) to press the outer diameter round grooves (8, 8') of the engagement plate (30) against the center and fix it in place. Therefore, only one-way force is used, which has the disadvantage that the inner circumference of the soft jaw (1) is limited only by the depth of the round grooves (8, 8').

[0009] FIG. 3 is a state diagram of a soft jaw fixing device for a lathe chuck according to the prior art.

[0010] A plurality of spiral grooves (51) are formed in a circular pattern on the boring plate (50), and the adjusting slide (40) is connected to the spiral grooves so that it can move, and then attached to the bolt holes of the soft jaw for machining. At this time, connection is possible by aligning the connecting positions of the bolt holes of the soft jaw and the adjusting slide (40), but this alignment can be difficult.

[0011] Furthermore, when machining soft jaws to hold a workpiece in a CNC lathe chuck, the soft jaws are machined by gripping a master ring with a smaller diameter than the workpiece. However, when attempting to machine soft jaws in this way, many master rings with different diameters must be prepared beforehand before machining the soft jaws, which requires the time and effort of finding a master ring with an appropriate diameter from among the many master rings. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Korean Patent Publication No. 2000-0063591 Summary of the Invention [Problem to be solved by the invention]

[0013] The present invention has been invented to solve the above-mentioned problems, and an object of the present invention is to provide a boring tool for soft jaw machining that can precisely machine the inner diameter of a soft jaw without holding a large number of master rings.

[0014] An object of the present invention is to provide a boring device for machining soft jaws that can precisely adjust the gripping width when machining the inner diameter of a soft jaw and can machine a minimum inner diameter when remachining a previously machined soft jaw. [Means for solving the problem]

[0015] To achieve the above objectives, a soft jaw boring machine according to one embodiment of the present invention is disclosed.

[0016] The jaw stopper coupled to the soft jaw has a stopper pin inserted into the bolt hole of the soft jaw, and the boring adjustment plate, which contacts the jaw stopper to determine the machining diameter of the soft jaw, has a circular through hole therein and a spiral protrusion surface formed on its edge. The spiral protrusion surface includes outer surfaces with the smallest and largest radii from the center of the circular through hole on both sides, and has a spiral shape with a regularly increasing radius between the two outer surfaces.

[0017] The spiral protrusion surface corresponds to the number of soft jaws attached to the lathe chuck. In one embodiment, three soft jaws are attached to three master jaws, resulting in three spiral protrusion surfaces.

[0018] After the stopper pins of the three jaw stoppers are inserted into the bolt holes of the three soft jaws that are to be joined to the three master jaws, the boring adjustment plate is seated on the seating surface of the jaw stopper, with the outer surface of the spiral protrusion with the smallest radius positioned toward the joining portion of the jaw stopper.

[0019] When the boring adjustment plate is rotated in a direction in which the radius of the spiral projection surface increases, the joining surfaces of the spiral projection surface and the jaw stopper come into contact while slicing.

[0020] When the spiral protrusion surface of the boring plate and the joint surface of the jaw stopper slide and come into contact, the jaw stopper gradually rotates and slides while contacting the spiral protrusion surface of the boring plate until they come into complete contact, at which point the boring plate cannot rotate any further. At this time, if the hydraulic chuck is operated in the direction that increases the diameter of the soft jaw, a separation occurs between the two contact surfaces, allowing the boring plate to rotate further by the amount of the separation that has occurred. After determining the amount of rotation while looking at the indication scale on the jaw stopper and the measurement scale on the boring plate, the soft jaw of the hydraulic chuck is operated in the direction that decreases the diameter, and when the spiral protrusion surface of the boring plate and the joint surface of the show stopper come into contact, the operation of the soft jaw will stop and the soft jaw can be processed. [Effects of the Invention]

[0021] As described above in detail, the present invention is quickly mounted on the upper part of the soft jaw that is coupled to the master jaw of the chuck of a CNC lathe, and can be precisely and finely machined, thereby significantly reducing the working time required for soft jaw machining. In addition, compared with conventional boring rings, it is possible to machine larger diameters, which significantly improves practicality. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is an exploded perspective view of a jaw fixing device for a lathe chuck according to the prior art. [Figure 2] FIG. 1 is a diagram showing a state in which a jaw and a mating plate are fixed according to the prior art. [Figure 3] 1 is a state diagram of a soft jaw fixing device for a lathe chuck according to the prior art; [Figure 4] FIG. 1 is an exploded view of a boring device for soft jaw processing for explaining an embodiment of the present invention. [Figure 5] 1 is a view showing a jaw stopper (300). [Figure 6]FIG. 10 is a view showing a separation prevention portion (320) on the top of the stopper body (315) of the jaw stopper (300). [Figure 7] FIG. 10 is a view showing a boring adjustment plate (200). [Figure 8] FIG. 10 is a view showing a boring adjustment plate (200). DETAILED DESCRIPTION OF THE INVENTION

[0023] The best mode of the present invention is shown in Figure 6. In order to strengthen the prevention of separation of the boring adjustment plate (200) connected to the stopper body (315) of Figure 5, a separation prevention part is added, and in Figure 6, a separation prevention part (320) is formed on the top of the stopper body (315) of the jaw stopper (300).

[0024] Although the present invention can be modified in various ways and can have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the present invention to the specific disclosed form, but should be understood as including all modifications, equivalents, and alternatives within the spirit and technical scope of the present invention. It should also be noted that the shape, size, and spacing between elements in the accompanying drawings may be reduced or exaggerated in order to emphasize a clearer description.

[0025] The terms used in this application are merely used to describe specific embodiments and are not intended to limit the present invention. The singular expressions include the plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, and should not be understood to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0026] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this invention pertains. Terms, such as those defined in commonly used dictionaries, should be interpreted to have a meaning consistent with the meaning in the context of the relevant art, and should not be interpreted as idealized or overly formal unless expressly defined in this application.

[0027] In describing the present invention, detailed descriptions of related publicly known functions will be omitted if it is determined that such descriptions may unnecessarily obscure the gist of the present invention as being obvious to those skilled in the art.

[0028] FIG. 4 shows an exploded view of a boring device for soft jaw machining for explaining an embodiment of the present invention.

[0029] A lathe chuck 100 is provided with a number of slidable master jaws 120, and a soft jaw 110 is installed on top of each master jaw 120 to tightly hold a workpiece. A number of bolt holes are formed on the top of the soft jaw 110, and stopper pins 311 of a jaw stopper 300 are inserted into the bolt holes along assembly disassembly lines 301. A magnet is inserted and fixed into the jaw stopper 300 to maintain contact between the jaw stopper 300 and the soft jaw 110.

[0030] 4, three jaw stoppers 300 are attached to three soft jaws 110, and the adjustment plate seating surface 203 of the boring adjustment plate 200 is seated on the stopper seating surfaces 313 of the attached three jaw stoppers 300. The soft jaw machining boring device of the present invention is a device for machining the soft jaws 110 by seating and fixing the boring adjustment plate 200 on the stopper seating surfaces 313 of the jaw stoppers 300.

[0031] FIG. 5 is a drawing showing the jaw stopper (300), including an isometric view, a top view, and a cross-sectional view BB taken along line B of the cross-sectional view from the top view.

[0032] 5, the jaw stopper 300 has a stopper pin 311 that is inserted into the upper bolt hole of the soft jaw 110, and a stopper body 315 formed on the upper part of the stopper pin 311. The stopper body 315 has a stopper seating surface 313 and a coupling surface 312 on its entire surface, an extension plate 314 on its side, and a stopper scale 310 on its upper part.

[0033] A stopper seating surface (313) having a certain area in a direction parallel to the soft jaw (110) is formed on the front surface of the stopper body (315), and the boring adjustment plate (200) is seated on the stopper seating surface (313).

[0034] The stopper body 315 has a front surface formed with an undercut-shaped inclined coupling surface 312, which has a spiral shape to match the spiral protrusion surface of the boring adjustment plate. The inclination angle 2 of the coupling surface 312 is less than 90 degrees, as shown in cross section BB.

[0035] FIG. 6 is a diagram showing the separation prevention portion (320) on the top of the stopper body (315) of the jaw stopper (300).

[0036] In the above embodiment, if the inclination angle (1) between the coupling surface (312) and the spiral protrusion surface (201) is small or perpendicular, the downforce is weak and the bowling adjustment plate (200) may come off. In this case, to prevent the bowling adjustment plate (200) from coming off, a separation prevention part (320) may be formed on the stopper body (315), and an adjustment scale may be provided on the upper surface of the separation prevention part (320) as needed.

[0037] 7 and 8 are diagrams showing the boring adjustment plate (200).

[0038] The boring adjustment plate (200) has a circular through hole inside, and a spiral protrusion surface (201) is formed on the edge, along which the adjustment plate scale (210) is displayed. The spiral protrusion surface (201) has outer surfaces on both sides with the smallest and largest radii from the center of the circular through hole, and has a spiral shape with the radius length increasing regularly between the two outer surfaces.

[0039] The outer surface of the spiral protrusion surface (201) has a spiral surface that contacts the coupling surface (312) of the jaw stopper (300) at the same inclination as the coupling surface (312). The opposite surface of the adjusting plate scale (210) has an adjusting plate seating surface (203) that contacts the stopper seating surface (313) of the jaw stopper (300). The three spiral protrusion surfaces (201) shown in the figure are provided in an example where the lathe chuck (100) has three soft jaws (110). Therefore, the lathe chuck (100) has the same number of spiral protrusion surfaces (201) as the number of soft jaws (110) configured therein.

[0040] 7 is a diagram showing the state in which the adjusting plate seating surface 203 of the boring adjusting plate 200 is initially seated on the stopper seating surface 313 of the jaw stopper 300. When the adjusting plate seating surface 203 of the boring adjusting plate 200 is initially seated on the stopper seating surface 313 of the jaw stopper 300, if the outer surface with the smallest radius of the spiral protrusion surface 201 of the boring adjusting plate 200 is seated, the coupling surface 312 and the spiral protrusion surface 201 are seated with a separation distance. When the boring adjusting plate 200 is rotated in the direction in which the spiral protrusion surface 201 increases, the coupling surface 312 and the spiral protrusion surface 201 come into contact, and the separation is eliminated as shown in FIG.

[0041] Figure 8 shows how the connecting surface (312) and the spiral protrusion surface (201) come into contact when the adjustment plate seating surface (203) of the boring adjustment plate (200) is seated on the stopper seating surface (313) of the jaw stopper (300) and the boring adjustment plate (200) is rotated in the direction in which the spiral protrusion surface (201) becomes larger.

[0042] When the coupling surface (312) and the spiral protrusion surface (201) come into contact, the soft jaw (110) can only move from the center of the lathe chuck (100) toward the edge, and the machine is operated to move the soft jaw (110) toward the edge of the lathe chuck (100) by referring to the stopper scale (310). At this time, if separation occurs between the coupling surface (312) and the spiral protrusion surface (201), the boring adjustment plate (200) can be further turned to adjust the position of the soft jaw (110).

[0043] When the boring adjustment plate (200) is turned to position the soft jaw (110) appropriately, the machine is operated to move the soft jaw (110) toward the center of the lathe chuck (100), and the coupling surface (312) and the spiral protrusion surface (201) come into contact with each other. At this time, the movement of the soft jaw (110) stops, and the soft jaw (110) is ready for machining.

[0044] 8(b) is a cross-sectional view showing the cross section AA extracted by line A in FIG. 8(a). When the boring plate (200) and the jaw stopper (300) come into contact without any separation, the spiral protrusion surface (201) and the coupling surface (312) are arcs with the same diameter, so there is no gap and they make surface contact. When the jaw stopper (300) comes into strong contact with the adjusting plate (200) due to the operation of the machine, the two contact surfaces slide due to the inclination angle (1) between the coupling surface (312) and the spiral protrusion surface (201), generating a downforce that causes the adjusting plate seating surface (203) to come into strong contact with the stopper seating surface (313). This downforce prevents the adjusting plate (200) from coming off even when the lathe chuck (100) is rotated at high speed.

[0045] The description of the embodiments presented is provided to enable one of ordinary skill in the art to use or practice the invention. Various modifications to these embodiments will be apparent to those of ordinary skill in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments presented herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. [Industrial Applicability]

[0046] The present invention significantly improves the practicality of a tool that allows a user of a CNC lathe to easily and quickly carry out soft jaw machining work when using the CNC lathe.

Claims

1. a jaw stopper (300) including a stopper pin (311) inserted into a bolt hole of the soft jaw (110), and a stopper body (315) having a stopper seating surface (313) and a coupling surface (312) formed on the front surface and a stopper scale (310) displayed on the top; The boring adjustment plate (200) has a circular through-hole inside, a spiral protrusion surface (201) formed on the edge, and an adjustment plate scale (210) displayed along the spiral protrusion surface (201). The boring device for soft jaw machining is characterized in that the boring adjustment plate (200) is seated and fixed on the stopper seating surface (313).

2. The boring adjustment plate (200) has a spiral protrusion surface (201) formed on the edge of a circular plate with a through hole at the center, and a jaw stopper (300) that is in surface contact with the spiral protrusion surface (201) of the boring adjustment plate (200) and is connected to the bolt hole of the soft jaw to control the movement of the soft jaw. The jaw stopper (300) moves while maintaining contact with the surface of the spiral protrusion surface (201) as the boring adjustment plate (200) rotates left and right, thereby controlling the movement of the soft jaw.

3. 3. The soft jaw boring device according to claim 1, wherein the jaw stopper (300) includes a coupling surface (312) having an inclination corresponding to the spiral protrusion surface (201), and the inclination angle of the coupling surface (312) is less than 90 degrees.

4. 2. The soft jaw boring device according to claim 1, wherein a separation prevention portion (320) for preventing separation of the boring adjustment plate is formed on an upper portion of the stopper body (315).

5. 3. The boring device for soft jaw machining according to claim 1, wherein the number of said jaw stoppers (300) and said spiral protrusion surfaces (201) is the same.

6. 2. The soft jaw machining boring device according to claim 1, wherein the boring adjustment plate (200) is seated on the stopper seating surface (313) of the jaw stopper (300), and when the boring adjustment plate (200) is rotated in a direction in which the spiral protrusion surface (201) becomes larger, the coupling surface (312) and the spiral protrusion surface (201) come into contact with each other.

7. 3. The soft jaw boring device according to claim 1, wherein the spiral protrusion surface (201) includes an outer surface having the smallest radius and an outer surface having the largest radius from the center of the circular through hole on both sides, and the length of the radius between the two outer surfaces is a spiral that increases regularly.

8. 2. The boring device for soft jaw machining according to claim 1, wherein the stopper pin (311) is fixed by inserting a magnet therein.

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