Worm shaft machining device and method for long drum-shaped worm gear

Abstract

The present invention relates to a device and a method for machining a worm shaft in a long drum-shaped worm gear formed by a worm shaft (worm shaft) and a worm gear (worm gear), and more particularly, to a device and a method for machining a worm shaft in a long drum-shaped worm gear formed by a worm shaft (worm shaft) and a worm gear (worm gear). According to the present invention, X-axis movement of a worm shaft, Y-axis and Z-axis movement of a worm machining tool, A-axis rotation of the worm shaft, C-axis rotation of the tool, and B-axis inclination of a bracket to which the tool is mounted can be realized, and a machining process of the worm shaft can be easily performed.

Description

Technical Field

[0001] The present invention relates to a worm shaft processing device and method for a long drum-shaped worm gear, and more particularly, to a worm shaft processing device and method for a long drum-shaped worm gear that can easily perform a thread processing process for a worm shaft having a long drum shape. Background Art

[0002] Generally speaking, in the power transmission system of a power transmission device, gears having a tooth shape using an involute curve, which is a locus drawn by the end of a line when the line wound around a circle is released in a taut state, are mainly used.

[0003] The gears as described above are devices that form their tooth shapes on the circumference and transmit rotation or power by meshing the gears formed on the circumference between two or more shafts. In the case of using gears, power or rotation can be reliably transmitted, and it can be transmitted at an accurate angular velocity ratio.

[0004] The types of such gears include spur gears, helical gears, bevel gears, and worm gears.

[0005] In particular, a worm gear is a special gear that has an extremely high gear ratio compared to general gears, and the input direction of power is perpendicular to the output direction.

[0006] For a power transmission device composed of a worm gear, the worm shaft is in a rod shape, and the worm wheel that meshes with the teeth of the worm shaft is in a disk shape. Moreover, the teeth of the worm shaft are formed at regular intervals along the circumference, so there is a problem that the mutual contact area between the worm shaft and the worm wheel becomes smaller, that is, the meshing ratio decreases.

[0007] Because the contact area of the tooth shape where the existing worm shaft and worm wheel mesh with each other as described above is narrow, the pressure applied to the gear teeth is local, resulting in a problem of low torque due to excessive pressure, and further leading to a problem of decreased efficiency of the worm and worm gear.

[0008] That is, there are problems such as low efficiency of the output rotational force, decreased durability and life of the gear teeth, weak impact resistance, and increased noise and vibration.

[0009] In order to improve the above problems, as a power transmission device, a long drum-shaped worm shaft such as a hindley worm has been proposed.

[0010] The outer peripheral surface of the long drum-shaped worm shaft is bent in the shape of a long drum, and a spiral groove, such as a spiral tooth, is formed in the bent area. Since the number of teeth of the worm wheel meshing with the teeth is large, the area supporting the pressure between the teeth is wider compared with a general worm gear, so that it has the characteristic of being able to transmit greater power while reducing the wear of the gear.

[0011] However, the existing power transmission device is only limited to the use of the long drum-shaped worm gear as described above, and cannot fully utilize the characteristics of the long drum-shaped worm shaft and be used together with various types of gears.

[0012] In addition, the teeth of the existing long drum-shaped worm shaft are also composed of a convex shape toothform and cannot be formed in a shape surrounding the circumferential contact surface of the worm wheel. Therefore, there are problems of a low contact ratio and a narrow contact area, resulting in high pressure, low torque, and reduced efficiency due to the localization of the pressure applied to the gear teeth.

[0013] In addition, when processing the long drum-shaped worm gear as described above, general worm processing devices have problems such as being unable to automatically perform processing with a diameter gradually increasing from the center axis to the outside and processing of the lead angle composed of each worm pitch.

[0014] Moreover, during processing, processing is carried out while the center axis rotates. And even when performing mechanical control as described above, there may be problems of errors caused by displacement due to rotation during cutting due to the torque caused by mechanical movement.

[0015] As described above, for the long drum-shaped worm gear, although it has the advantages of high load capacity and high-efficiency power transmission through higher torque bearing capacity, as described above, the existing technology has many problems in processing and cannot perform precise operations. Therefore, it is necessary to continue to develop corresponding technologies. Summary of the Invention

[0016] Technical Problem The present invention is developed based on the above technical background, and its purpose is to provide a worm shaft processing device and method for a long drum-shaped worm gear that can easily and precisely perform the worm shaft processing process of the long drum-shaped worm gear.

[0017] In addition, the purpose of the present invention is to provide a worm shaft processing device and method for a long drum-shaped worm gear that can realize the X-axis movement of the worm shaft, the Y-axis and Z-axis movement of the worm processing tool, the A-axis rotation of the worm shaft, the C-axis rotation of the tool, and the B-axis inclination of the bracket on which the tool is installed, so as to easily perform the worm shaft processing process.

[0018] In addition, an object of the present invention is to provide a worm shaft processing apparatus and method for a long drum-shaped worm gear capable of removing burrs by a plunging action.

[0019] In addition, an object of the present invention is to provide a worm shaft processing apparatus and method for a long drum-shaped worm gear capable of forming a lead angle on the worm shaft by tilting the B axis of the carriage.

[0020] The object of the present invention is not limited to the objects mentioned above, but other objects not mentioned can be clearly understood from the following description.

[0021] Technical Solution In order to achieve the above object, the present invention is characterized in that, as an apparatus for processing the worm shaft in a long drum-shaped worm gear composed of a long drum-shaped worm shaft and a worm wheel, it includes: an X-axis workbench equipped with an A-axis spindle that rotates the worm shaft around the length direction, i.e., the X-axis, and a support that can move in the X-axis direction along the length of the worm shaft; a carriage including a worm processing tool mounted with the cutting edge facing the cutting surface of the worm shaft, and a C-axis spindle that rotates the worm processing tool around the Z-axis; a column configured to move the carriage in the Z-axis direction; and a base provided at the lower part of the X-axis workbench and the column, configured to move the X-axis workbench in the X-axis direction and the column in the Y-axis direction. Wherein, when the number of teeth of the worm processing tool is the same as the number of teeth of the worm wheel, when the A-axis spindle and the C-axis spindle rotate at a speed ratio determined according to the ratio of the number of teeth of the worm processing tool to the number of teeth of the worm wheel to drive the worm shaft and the worm processing tool to rotate, the column will advance in the Y-axis direction and the worm processing tool will enter the worm shaft, and when the tip diameter of the tool enters the root diameter of the worm shaft, processing will start. Then, the column will retreat in the Y-axis direction and the carriage will rise in the Z-axis direction, driving the worm processing tool to retreat and rise. Then, the column will advance in the Y-axis direction again, causing the worm processing tool to enter the worm shaft. Next, the carriage will descend in the Z-axis direction and drive the worm processing tool to descend, thereby processing the worm shaft.

[0022] In addition, according to a preferred embodiment of the present invention, the bracket further includes: a B-axis saddle block that is inclined about the Y-axis.

[0023] In addition, to achieve the above object, the present invention is characterized in that, as a device for machining the worm shaft in a long-drum-shaped worm gear composed of a long-drum-shaped worm shaft and a worm wheel, it includes: an X-axis workbench equipped with an A-axis spindle that rotates the worm shaft about the length direction, i.e., the X-axis, and a support that can move in the X-axis direction along the length of the worm shaft; a bracket including a worm machining tool mounted with its cutting edge facing the cutting surface of the worm shaft, a C-axis spindle that rotates the worm machining tool about the Z-axis, and a saddle block that is inclined about the Y-axis; a column equipped in such a way that the bracket can move in the Z-axis direction; and a base equipped at the lower part of the X-axis workbench and the column, and equipped in such a way that the X-axis workbench can move in the X-axis direction and the column can move in the Y-axis direction. Wherein, when the number of teeth of the worm machining tool is less than the number of teeth of the worm wheel, when the A-axis spindle and the C-axis spindle rotate to drive the worm shaft and the worm machining tool to rotate at a speed ratio determined according to the ratio of the number of teeth of the worm machining tool to the number of teeth of the worm wheel, the column will move forward in the Y-axis direction and the worm machining tool will enter the worm shaft, and when the tooth end diameter of the tool enters the root diameter of the worm shaft, machining will start. At the same time, the X-axis workbench will move in the X-axis direction and drive the worm shaft to move in the X-axis direction, so that the worm machining tool is transferred along an arc (the arc is formed along the center of the pitch circle diameter (PCD) of the worm wheel and the pitch circle diameter (PCD) of the worm machining tool) and machining is performed. Furthermore, the bracket will descend in the Z-axis direction and the worm machining tool will descend to perform machining on the worm shaft, and the rotation direction of the worm machining tool and the transfer direction of the worm machining tool can be the same direction or opposite directions.

[0024] In addition, according to a preferred embodiment of the present invention, the X-axis workbench further includes: a first transfer device that moves in the X-axis direction by being connected to the support; and a first encoder and a linear scale that can precisely control the movement of the support.

[0025] In addition, according to a preferred embodiment of the present invention, the base further includes: a second transfer device that moves in the X-axis direction by being connected to the X-axis worktable; a second encoder and a linear scale that can precisely control the movement of the X-axis worktable; a third transfer device that moves in the Y-axis direction by being connected to the column; and a third encoder and a linear scale that can precisely control the movement of the column.

[0026] In addition, according to a preferred embodiment of the present invention, the column further includes: a fourth transfer device that moves in the Z-axis direction by being connected to the bracket; and a fourth encoder and a linear scale that can precisely control the movement of the bracket.

[0027] In addition, in order to achieve the above object, the present invention is characterized in that, as a method for machining a worm shaft of a worm shaft machining device using a long drum-shaped worm gear, it includes: a step of driving the worm shaft and the worm machining tool to rotate by rotating the A-axis spindle and the C-axis spindle at a speed ratio determined according to the ratio of the number of teeth of the worm machining tool to the number of teeth of the worm gear; a step of advancing the column in the Y-axis direction and causing the worm machining tool to enter the worm shaft, and starting machining when the tooth end diameter of the tool enters the root diameter of the worm shaft; a step of retracting the column in the Y-axis direction and raising the bracket in the Z-axis direction, thereby driving the worm machining tool to retract and rise; a step of advancing the column in the Y-axis direction again, so that the worm machining tool enters the worm shaft and performs machining; and a step of lowering the bracket in the Z-axis direction and driving the worm machining tool to lower and perform machining.

[0028] In addition, in order to achieve the above object, the present invention is characterized in that, as a method for machining a worm shaft of a worm shaft machining device using a long drum-shaped worm gear, it includes: a step of driving the worm shaft and the worm machining tool to rotate by rotating the A-axis spindle and the C-axis spindle at a speed ratio determined according to the ratio of the number of teeth of the worm machining tool to the number of teeth of the worm gear; a step of advancing the column in the Y-axis direction and causing the worm machining tool to enter the worm shaft, and starting machining when the tooth end diameter of the worm machining tool enters the root diameter of the worm shaft; a step of moving the X-axis worktable in the X-axis direction while the worm shaft moves in the X-axis direction, so that the worm machining tool is transferred along an arc formed by the center of the pitch circle diameter (PCD) of the worm gear and the pitch circle diameter (PCD) of the worm machining tool and performs machining; and a step of lowering the column in the Z-axis direction and lowering the worm machining tool and performing machining.

[0029] Technical effects With the present invention configured as described above, the following effects can be achieved. The machining of the worm shaft of the long drum-shaped worm gear can be performed easily and precisely. That is, the worm shaft can rotate along the X-axis and the A-axis while moving in the X-axis direction, and the cutting tool can rotate along the Y-axis and the C-axis, which are perpendicular to the X-axis, while moving in the Y-axis and Z-axis directions. Moreover, the cutting tool can tilt around the B-axis, which is perpendicular to the A-axis and the C-axis respectively, so that the machining process of the worm shaft can be easily performed.

[0030] At this time, the rotation of the A-axis, the movement of the X-axis, the rotation of the C-axis, and the movement of the Y-axis as described above can be synchronously controlled, so that the machining of the worm shaft can be easily performed according to the size of the cutting tool.

[0031] In addition, burrs can be easily removed by plunging in the Z-axis direction, and the lead angle of the worm shaft can be set by means of the tilting motion around the B-axis, so that precision machining can be easily performed as needed. Description of the Drawings

[0032] Figure 1 It is a perspective view showing the worm shaft machining device of the long drum-shaped worm gear according to a preferred embodiment of the present invention.

[0033] Figure 2 It is a schematic diagram showing the internal structure of the X-axis table, the base, and the column of the worm shaft machining device of the long drum-shaped worm gear according to a preferred embodiment of the present invention.

[0034] Figure 3 It is a cross-sectional view showing the worm shaft and the worm machining tool when the number of teeth of the cutting tool is the same as that of the worm wheel in the worm shaft machining device of the long drum-shaped worm gear according to a preferred embodiment of the present invention.

[0035] Figure 4 It is for Figure 3 showing the machining state in

[0036] Figure 5 It is a cross-sectional view showing the worm shaft and the worm machining tool when the number of teeth of the cutting tool is less than that of the worm wheel in the worm shaft machining device of the long drum-shaped worm gear according to a preferred embodiment of the present invention.

[0037] Figure 6 It is for Figure 5 showing the machining state in

[0038] <Description of Reference Numerals> 100: Worm shaft machining device for long drum-shaped worm gear 10: X-axis worktable 11: A-axis spindle 13: Support body 15: Chuck jaw 20: Worm machining tool 30: Bracket 31: C-axis spindle 33: Bracket block 40: Column 50: Base 61: Nut 62: Screw 63: Motor 64: Encoder 65: Coupling 67: Linear scale Detailed implementation manners

[0039] Next, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the advantages and features of the present invention and the methods for achieving them will be further clarified by the subsequent embodiments described in detail with reference to the accompanying drawings. In addition, the terms used in this specification are only for describing the embodiments and are not intended to limit the present invention. In these terms, unless clearly mentioned in the context, the singular statements also include the plural meanings, and the words indicating directions in the description are only for helping to understand the content being described and may change according to the perspective.

[0040] Next, the worm shaft machining device for a long drum-shaped worm according to the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 is a perspective view illustrating the worm shaft machining device for a long drum-shaped worm gear according to the preferred embodiments of the present invention.

[0041] Define the X-axis, Y-axis, and Z-axis according to the coordinates illustrated in the accompanying drawings, and define the axis rotating around the X-axis as the A-axis rotation, the axis rotating (or tilting) around the Y-axis as the B-axis rotation (or B-axis tilt), and the axis rotating around the Z-axis as the C-axis rotation.

[0042] Refer to Figure 1, the worm shaft processing device 100 of the long drum-shaped worm gear according to the present invention is a device that processes while rotating and moving the worm shaft 60 and using a rotating and moving cutting tool 33, and includes an X-axis workbench 10, a worm processing tool 20, a saddle 30, a column 40, and a base 50.

[0043] The X-axis workbench 10 can fix and rotate the worm shaft 60 to be processed, and includes: an A-axis main shaft 11 that rotates the worm shaft 60 around the length direction, that is, the X-axis; and a support 13 that is arranged on the Xc-axis workbench 10 and can move along the length of the worm shaft 60 in the X-axis direction.

[0044] That is, the worm shaft 60 rotates around the X-axis by means of the A-axis main shaft 11, that is, performs A-axis rotation. Among them, the A-axis rotation rotates synchronously with the following C-axis rotation, which will be described below.

[0045] In addition, the worm shaft 60 is fixed by means of the support 13 and the chuck jaw 15. As shown in the figure, one side of the worm shaft 60 is provided with a rotational force by the A-axis main shaft 11 in a state fixed by the chuck jaw 15, and the other side rotates and is fixed by means of a tailstock structure of the support 13 equipped with a support for the center point of the rotating worm shaft 60.

[0046] Among them, the support 13 can move along the guide rail on the X-axis workbench 10, and the support 13 is moved along the guide rail according to the length of the worm shaft 60 to be processed, so as to fix the worm shaft 60.

[0047] In order to realize the X-axis movement of the support 13 as described above, a first transfer device is provided. Figure 2 An example of the above-mentioned first transfer device is illustrated in Figure 2 It is a schematic diagram showing the internal structures of the X-axis workbench, the base, and the column of the worm shaft processing device of the long drum-shaped worm gear according to a preferred embodiment of the present invention.

[0048] Refer to Figure 2 , the X-axis workbench 10 includes a nut 61 connected to the support 13, a ball screw 62 that moves the support 13 in the X-axis direction by connecting with the nut 61, a motor 63 that drives the ball screw 62, and a coupling 65 that connects the ball screw 62 and the motor 63. Moreover, it includes an encoder 64 and a linear scale 67 that can perform precise control by measuring the movement displacement of the support 13.

[0049] The first transfer device according to the present invention is not limited to the configuration described above, but may adopt any configuration capable of realizing the linear movement of the support 13 in the X-axis. In the above-described configuration, in addition to the nut and the ball screw, a linear motor may be used for driving.

[0050] Among them, the linear scale 67 is a device that measures and feeds back the movement amount of the support 13. When the X-axis movement of the support 13 is required, under the drive of the encoder 64 and the motor 63, the support 13 will move by means of the ball screw 62 and the nut 61, and the linear scale 67 will confirm the position of the support 13. Thus, when it is different from the position to be moved, the error value will be corrected and feedback control will be executed.

[0051] In addition, the support 13 may be in a form that can rotate without a separate power source. The end is tapered so that its end part is formed in a sharp shape, and thereby it contacts and supports the central part of the other end face of the worm shaft 60.

[0052] Next, the saddle 30 is a part equipped with the worm machining tool 20 for machining the worm shaft 60, and includes the worm machining tool 20 installed in such a way that the cutting edge faces the cutting surface of the worm shaft 60, the B-axis saddle block 33 inclined around the Y-axis, and the C-axis spindle 31 that rotates the worm machining tool 20 around the Z-axis.

[0053] The worm machining tool 20 is equipped on the C-axis spindle 31 that rotates around the Z-axis and performs C-axis rotation, and as shown in the figure, it is equipped in the saddle block 33 in such a way that the cutting edge faces the cutting surface of the worm shaft 60.

[0054] Among them, the saddle block 33 is in the shape of "┓", and as shown in the figure, the horizontal side is arranged along the Y-axis direction, and the C-axis spindle 31 facing downward is arranged on the lower side of the horizontal side, so that the cutting edge of the worm machining tool 20 faces the cutting surface of the worm shaft 60.

[0055] Among them, the shape of the saddle block 33 is not limited to the shape of "┓", and any shape can be adopted as long as the worm machining tool 20 can face the cutting surface of the worm shaft 50 and the worm machining tool 20 can perform B-axis inclination by means of the saddle block 33.

[0056] In addition, the vertical side of the saddle block 33 is arranged along the Z-axis direction, and it is arranged in the column 40. In particular, it is arranged in the saddle 30 in such a way that it rotates around the Y-axis, that is, performs B-axis inclination.

[0057] That is, the bracket block 33 is arranged in the bracket 30 in such a way that the C-axis spindle 31 rotates around the Z-axis and tilts around the Y-axis, that is, performs B-axis tilting.

[0058] Next, the column 40 is arranged in such a way that the bracket 30 can move in the Z-axis direction. A guide rail is provided on the front surface of the column 40, so that the bracket 30 can move in the Z-axis direction along the guide rail.

[0059] A fourth transfer device for moving the bracket 30 in the Z-axis direction is arranged along the guide rail of the column 40 as described above, and as Figure 2 shown, the column 40 includes a nut 61 connected to the bracket 30, a ball screw 62 that moves the bracket 30 in the Z-axis direction by connecting with the nut 61, a motor 63 that drives the ball screw 62, a coupling 65 that connects the ball screw 62 and the motor 63, and an encoder 64 and a linear scale 67 that can perform precise control by measuring the moving displacement of the bracket 30.

[0060] Among them, the fourth transfer device is the same as the first transfer device described above and is not limited to the Figure 2 configuration.

[0061] Next, the base 50 is arranged below the X-axis table 10 and the column 40, so that the X-axis table 10 can move in the X-axis direction and the column 40 can move in the Y-axis direction.

[0062] That is, the base 50 is provided with a guide rail along the X-axis direction on the upper part, so that the X-axis table 10 can perform X-axis movement, and is provided with a guide rail along the Y-axis direction on the upper part, so that the column 40 can perform Y-axis movement.

[0063] For this purpose, a second transfer device is provided, and as Figure 2 shown, the base 50 includes a nut 61 connected to the X-axis table 10, a ball screw 62 that moves the X-axis table 10 in the X-axis direction by connecting with the nut 61, a motor 63 that drives the ball screw 62, a coupling 65 that connects the ball screw 62 and the motor 63, and an encoder 64 and a linear scale 67 that can perform precise control by measuring the moving displacement of the X-axis table 10.

[0064] Among them, the second transfer device is the same as the first transfer device described above and is not limited to the Figure 2 configuration.

[0065] In addition, a third transfer device connected to the column 40 is provided in the base 50. The third transfer device described above includes a nut 61, a ball screw 62 that moves the column 40 in the Y-axis direction by being connected to the nut 61, a motor 63 that drives the ball screw 62, a coupling 65 that connects the ball screw 62 and the motor 63, an encoder 64 that can perform precise control by measuring the moving displacement of the column 40, and a linear scale 67.

[0066] Among them, the third transfer device is the same as the first transfer device described above, and is not limited to the Figure 2 configuration in.

[0067] Next, a processing method of a worm shaft processing device using a long drum-shaped worm gear according to the present invention will be described.

[0068] The worm shaft processing device of the long drum-shaped worm gear according to the present invention can be classified into cases where the number of teeth of the worm processing tool is the same as the number of teeth of the worm wheel and cases where the number of teeth of the worm processing tool is less than the number of teeth of the worm wheel for processing.

[0069] First, a worm shaft processing method of the long drum-shaped worm gear according to the present invention in the case where the number of teeth of the worm processing tool is the same as the number of teeth of the worm wheel will be described.

[0070] Figure 3 is a cross-sectional view showing a worm shaft and a worm processing tool in a worm shaft processing device of a long drum-shaped worm gear according to a preferred embodiment of the present invention, and Figure 4 is Figure 3 a schematic diagram showing the processing state in.

[0071] That is, referring to Figure 3 , it is a case where the worm shaft 60 is processed by using a worm processing tool 20 having the same size as the worm wheel in a worm gear composed of the worm shaft 60 and the worm wheel.

[0072] In the drawings, the tip diameter is the tip diameter of the worm processing tool 20, the root diameter is the root diameter of the worm shaft 60, and the axial distance is the distance between the center of the worm wheel, that is, the center of the worm processing tool 20 and the center of the worm shaft 60.

[0073] Referring to Figures 1 to 4 , first, the A-axis main shaft 11 and the C-axis main shaft 31 are driven to rotate the worm shaft 60 and the worm processing tool 20 at a speed ratio determined according to the ratio of the number of teeth of the worm processing tool 20 to the number of teeth of the worm wheel.

[0074] Among them, the column 40 will move forward in the Y-axis direction, so that the worm machining tool 20 enters the worm shaft 60 in the manner shown by No. 1 in Figure 4 , and machining starts when the tip diameter of the worm machining tool 20 enters the root diameter of the worm shaft 60.

[0075] Next, the column 40 moves backward in the Y-axis direction and the bracket 30 moves upward in the Z-axis direction, so that the worm machining tool 20 moves backward and upward in the manner shown by No. 2 in Figure 4 . That is, it moves upward in the rear diagonal direction.

[0076] Next, the column 40 moves forward in the Y-axis direction again, so that the worm machining tool 20 enters the worm shaft 60 and machining is performed in the manner shown by No. 3 in Figure 4 .

[0077] Next, the bracket 30 moves downward in the Z-axis direction, so that the worm machining tool 20 moves downward and machining of the worm shaft 60 is performed in the manner shown by No. 4 in Figure 4 .

[0078] As described above, after the worm shaft 60 and the worm machining tool 20 rotate, and the worm machining tool 20 moves forward in the Y-axis direction to start machining, the worm machining tool 20 will move backward and upward in the diagonal direction, and then move forward in the Y-axis direction again and then move downward in the Z-axis direction, so as to perform machining of the worm shaft 60.

[0079] Among them, the action of moving the worm machining tool 20 downward in the Z-axis direction is to perform plunging and remove the unprocessed area while machining the worm shaft 60.

[0080] That is, through the plunging action, burrs generated in the machining process according to the present invention can be more easily removed, and machining can be performed without an unprocessed area.

[0081] In addition, the bracket block 33 can be tilted around the B axis, and in order to perform the tilting action of the bracket block 33, a lead angle can be formed on the worm shaft 60.

[0082] That is, as shown by No. 1 in Figure 4 , when the worm machining tool 20 enters, after tilting the bracket block 33 at the lead angle required for machining on the worm shaft 60, the worm machining tool 20 is made to enter and machine the worm shaft 60, so that a lead angle can be formed and machined on the worm shaft 60.

[0083] Among them, the tilting operation of the bracket block 33 can also be omitted, that is, the worm shaft 60 can be machined after forming a cutting edge with an angle equivalent to the lead angle on the worm machining tool 20.

[0084] In the above-described case, even if the tilting operation of the bracket block 33 is not performed, a lead angle can be formed on the worm shaft 60 for machining.

[0085] In addition, when the number of teeth of the worm machining tool 20 is the same as the number of teeth of the worm wheel as described above, there is no need to move the X-axis table 10 in the X-axis direction.

[0086] Next, a method for machining the worm shaft of a long drum-shaped worm gear according to the present invention in the case where the number of teeth of the worm machining tool is less than the number of teeth of the worm wheel will be described.

[0087] Figure 5 is a cross-sectional view showing the worm shaft and the worm machining tool in a worm shaft machining apparatus for a long drum-shaped worm gear according to a preferred embodiment of the present invention when the number of teeth of the tool is less than the number of teeth of the worm wheel, and Figure 6 is for Figure 5 a schematic view showing the machining state in

[0088] That is, referring to Figure 5 , it is a case where the worm shaft 60 is machined using a worm machining tool 20 having a size smaller than that of the worm wheel in a worm gear composed of the worm shaft 60 and the worm wheel.

[0089] In the drawings, PCD refers to the pitch circle diameter, and the transfer path of the worm machining tool 20 can be determined using the pitch circle diameter (PCD) of the worm wheel and the pitch circle diameter (PCD) of the worm machining tool.

[0090] That is, when the number of teeth of the worm machining tool is less than the number of teeth of the worm wheel, in addition to the forward and backward and lifting operations of the worm machining tool 20, it is also necessary to transfer along an arc (the arc is formed along the cutting surface of the worm shaft 60), and when the worm machining tool 20 is transferred along the arc as described above, the transferred arc is formed along the center of the pitch circle diameter (PCD) of the worm wheel and the pitch circle diameter (PCD) of the worm machining tool 20.

[0091] Referring to Figure 1 , Figure 5 and Figure 6 , first, the A-axis spindle 11 and the C-axis spindle 31 are driven to rotate the worm shaft 60 and the worm machining tool 20 at a speed ratio determined according to the ratio of the number of teeth of the worm machining tool 20 to the number of teeth of the worm wheel.

[0092] Among them, the column 40 will move forward in the Y-axis direction, so that the worm machining tool 20 enters the worm shaft 60 in the manner shown by No. 1 in Figure 6 , and machining starts when the tooth end diameter of the worm machining tool 20 enters the root diameter of the worm shaft 60. Among them, the distance from the tooth end diameter of the worm machining tool 20 to the root diameter of the worm shaft 60 will be the same as the distance where the pitch circle diameter (PCD) of the worm gear described above contacts the pitch circle diameter (PCD) of the worm machining tool 20.

[0093] At the same time, the X-axis table 10 moves in the X-axis direction and the worm shaft 60 moves in the X-axis, so that machining is performed while the worm machining tool 20 is transferred along the arc formed by the center of the pitch circle diameter (PCD) of the worm gear and the pitch circle diameter (PCD) of the worm machining tool 20. In Figure 6 , the transfer of the worm machining tool 20 described above is illustrated by the D arrow.

[0094] As described above, the X-axis movement of the X-axis table 10, the Y-axis movement of the worm machining tool 20, the A-axis rotation of the worm shaft 60, and the C-axis rotation of the worm machining tool 20 will be performed simultaneously.

[0095] Next, the carriage 30 descends in the Z-axis direction, so that the worm machining tool 20 is driven to descend and the worm shaft 60 is machined in the manner shown by No. 2 in Figure 6 .

[0096] Among them, the action of driving the worm machining tool 20 to descend in the Z-axis direction is to perform shaping and remove the unprocessed area while machining the worm shaft 60.

[0097] In addition, through the tilting action of the carriage block 33 centered on the B-axis, a lead angle can be formed on the worm shaft 60, or a cutting edge can be formed on the worm machining tool 20 at an angle equivalent to the lead angle and the worm shaft 60 can be machined. Thus, even if the tilting action of the carriage block 33 is not performed, a lead angle can be formed on the worm shaft 60 and machining can be carried out.

[0098] In addition, the transfer direction of the worm machining tool 20 can also be in the direction opposite to the D arrow.

[0099] The above description is only an exemplary illustration of the technical idea of the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various modifications, alterations, and substitutions without departing from the essential characteristics of the present invention. In addition, the embodiments and drawings disclosed in the present invention as described above are only for explaining the technical idea of the present invention rather than limiting it. The scope of the technical idea of the present invention is not limited by these embodiments and drawings. The protection scope of the present invention should be interpreted according to the appended claims, and all technical ideas within the same scope as it should be interpreted as being included within the scope of the claims of the present invention.

Claims

1. A machining device for a worm shaft of a long drum-shaped worm gear, characterized in that As a device for machining the worm shaft in a long drum-shaped worm gear composed of a long drum-shaped worm shaft and a worm wheel, it includes: An X-axis workbench equipped with an A-axis main shaft that rotates the worm shaft around the X-axis as the length direction, and a support that can move along the length of the worm shaft in the X-axis direction; A carriage including a worm machining tool mounted with its cutting edge facing the cutting surface of the worm shaft, and a C-axis main shaft that rotates the worm machining tool around the Z-axis; A column configured to enable the carriage to move in the Z-axis direction; and A base equipped at the lower part of the X-axis workbench and the column, configured to enable the X-axis workbench to move in the X-axis direction and the column to move in the Y-axis direction, wherein, when the number of teeth of the worm machining tool is the same as the number of teeth of the worm wheel, when the A-axis main shaft and the C-axis main shaft rotate at a speed ratio determined according to the ratio of the number of teeth of the worm machining tool to the number of teeth of the worm wheel to drive the worm shaft and the worm machining tool to rotate, the column will advance in the Y-axis direction and make the worm machining tool enter the worm shaft, and start machining when the tip diameter of the tool enters the root diameter of the worm shaft, furthermore, the column will retreat in the Y-axis direction and the carriage will rise in the Z-axis direction, thereby driving the worm machining tool to retreat and rise, the column will advance in the Y-axis direction again, so that the worm machining tool enters the worm shaft, next the carriage will descend in the Z-axis direction and drive the worm machining tool to descend, thereby machining the worm shaft.

2. The machining device for a worm shaft of a long drum-shaped worm gear according to claim 1, characterized in that the carriage further includes: A B-axis saddle block inclined around the Y-axis.

3. A machining device for a worm shaft of a long drum-shaped worm gear, characterized in that As a device for machining the worm shaft in a long drum-shaped worm gear composed of a long drum-shaped worm shaft and a worm wheel, it includes: An X-axis workbench equipped with an A-axis main shaft that rotates the worm shaft around the X-axis as the length direction, and equipped with a support that can move along the length of the worm shaft in the X-axis direction; A carriage including a worm machining tool mounted with its cutting edge facing the cutting surface of the worm shaft, a C-axis main shaft that rotates the worm machining tool around the Z-axis, and a saddleblock inclined around the Y-axis; A column configured to enable the carriage to move in the Z-axis direction; and A base, which is provided at the lower part of the X-axis workbench and the column, and is configured to enable the X-axis workbench to move in the X-axis direction and the column to move in the Y-axis direction. Wherein, when the number of teeth of the worm machining tool is less than the number of teeth of the worm wheel, When driving the worm shaft and the worm machining tool to rotate by rotating the A-axis spindle and the C-axis spindle at a speed ratio determined according to the ratio of the number of teeth of the worm machining tool to the number of teeth of the worm wheel, The column will advance in the Y-axis direction and the worm machining tool will enter the worm shaft, and machining will start when the tip diameter of the tool enters the root diameter of the worm shaft. At the same time, the X-axis workbench will move in the X-axis direction and drive the worm shaft to move in the X-axis direction, so that the worm machining tool is transferred along an arc formed by the center of the pitch circle diameter (PCD) of the worm wheel and the pitch circle diameter of the worm machining tool and machining is performed. Furthermore, the bracket will descend in the Z-axis direction and the worm machining tool will descend, thereby performing machining on the worm shaft. The rotation direction of the worm machining tool and the transfer direction of the worm machining tool can be the same direction or opposite directions to each other.

4. The worm shaft machining device of a long drum-shaped worm gear according to claim 1 or claim 3, characterized in that The X-axis workbench further includes: A first transfer device that moves in the X-axis direction by being connected to the support; and A first encoder and a linear scale, which can precisely control the movement of the support.

5. The worm shaft machining device of a long drum-shaped worm gear according to claim 1 or claim 3, characterized in that The base further includes: A second transfer device that moves in the X-axis direction by being connected to the X-axis workbench; A second encoder and a linear scale, which can precisely control the movement of the X-axis workbench; A third transfer device that moves in the Y-axis direction by being connected to the column; and A third encoder and a linear scale, which can precisely control the movement of the column.

6. The worm shaft machining device of a long drum-shaped worm gear according to claim 1 or claim 3, characterized in that The column further includes: A fourth transfer device that moves in the Z-axis direction by being connected to the bracket; and A fourth encoder and a linear scale, which can precisely control the movement of the bracket.

7. A worm shaft machining method for a long drum-shaped worm gear, characterized in that As a worm shaft machining method using the worm shaft machining device of the long drum-shaped worm gear according to claim 1, it includes: A step of driving the worm shaft and the worm machining tool to rotate by rotating the A-axis spindle and the C-axis spindle at a speed ratio determined according to the ratio of the number of teeth of the worm machining tool to the number of teeth of the worm wheel. The step of advancing the column in the Y-axis direction to cause the worm machining tool to enter the worm shaft, and starting machining when the tooth end diameter of the tool enters the root diameter of the worm shaft; The step of retracting the column in the Y-axis direction and raising the carriage in the Z-axis direction, thereby driving the worm machining tool to retract and rise; The step of advancing the column in the Y-axis direction again to cause the worm machining tool to enter the worm shaft and perform machining; and The step of lowering the carriage in the Z-axis direction and driving the worm machining tool to lower and perform machining.

8. A method for machining a worm shaft of a long drum-shaped worm gear, characterized in that As a method for machining a worm shaft using the worm shaft machining device of the long drum-shaped worm gear according to claim 3, it includes: The step of driving the worm shaft and the worm machining tool to rotate by rotating the A-axis main shaft and the C-axis main shaft at a speed ratio determined according to the ratio of the number of teeth of the worm machining tool to the number of teeth of the worm wheel; The step of advancing the column in the Y-axis direction to cause the worm machining tool to enter the worm shaft, and starting machining when the tooth end diameter of the worm machining tool enters the root diameter of the worm shaft; At the same time, the X-axis worktable moves in the X-axis direction and drives the worm shaft to move in the X-axis direction, so that the worm machining tool is transferred along an arc formed by the center of the pitch circle diameter of the worm wheel and the pitch circle diameter of the worm machining tool and performs machining; and The step of lowering the column in the Z-axis direction and lowering the worm machining tool and performing machining.

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