JP2024047963A - Gear Processing Equipment - Google Patents

Abstract

[Problem] To provide a gear cutting device that prevents wear of a member supporting the workpiece while suppressing the generation of burrs on the removal end face of the workpiece, and ensures high durability. [Solution] A gear cutting device 100 according to the present invention is a gear cutting device that cuts a workpiece 102 by moving a tool to machine a gear, and is characterized in that, when the end face of the workpiece on the side where the cutting tool 104 removes at the end of processing in the moving direction of the cutting tool is called the removal end face 124, the device comprises a chuck 106 that holds the workpiece, a receiving jig 108 that abuts against a non-cutting position of the removal end face of the workpiece and supports the removal end face, and a co-cutting die 110 that abuts against a cutting position of the removal end face of the workpiece and supports the removal end face and is co-cut by the cutting tool together with the workpiece, and a first support surface 122 and a second support surface 128 of the receiving jig and the co-cutting die that face the removal end face of the workpiece are a common plane. [Selected Figure] Figure 1

Description

The present invention relates to a gear machining device that cuts a workpiece by moving a tool to machine a gear.

One known method for cutting gears is to move a cutting tool relative to the workpiece to cut the workpiece and machine the gear (for example, skiving or shaping). With this type of machining, burrs are generated on the end face (exit face) of the workpiece where the cutting tool comes out at the end of machining in the tooth groove direction (movement direction of the cutting tool).

Patent document 1 describes a gear cutting method in which the workpiece is cut by rotating the workpiece and the tool while feeding the workpiece in the axial direction of the tool.

Patent No. 6797648

In the gear machining method of Patent Document 1, the workpiece is coaxially sandwiched and fixed between a pair of upper and lower jigs, with the downstream end face of the workpiece in the feed direction (i.e., the end face of the workpiece) in surface contact with the lower jig. The lower jig is the same size as the inner diameter of the workpiece. In the gear machining method, the workpiece and the lower jig are both cut (cut together) with a tool, thereby suppressing the generation of burrs on the downstream end face of the workpiece in the feed direction.

Patent Document 1 also states that even if the workpiece is replaced, the lower jig continues to be used while maintaining the same fixed state (rotational phase). However, in Patent Document 1, the only member that supports the workpiece is the lower jig. The lower jig has a hardness that allows it to be cut, just like the workpiece. As a result, it may wear out as the workpiece is replaced during operation, resulting in gaps that allow burrs to form and a decrease in the positioning accuracy of the workpiece. If an attempt is made to prevent wear by increasing the hardness of the receiving jig, there is a risk that the tool will wear out faster or be damaged.

In view of these problems, the present invention aims to provide a gear cutting device that suppresses the generation of burrs on the removal end surface of the workpiece, prevents wear on the members that support the workpiece, and ensures high durability.

In order to solve the above problems, a typical configuration of a gear cutting device according to the present invention is a gear cutting device that cuts a workpiece by moving a tool to machine a gear, and when the end face of the workpiece in the direction of tool movement that the tool comes out of at the end of machining is called the "coming out end face," it is characterized in that it includes a chuck that holds the workpiece, a receiving jig that abuts against the non-cutting position of the tool on the coming out end face of the workpiece and supports the coming out end face, and a co-cutting die that abuts against the cutting position of the tool on the coming out end face of the workpiece and supports the coming out end face and is co-cut by the tool together with the workpiece, and the surfaces of the receiving jig and the co-cutting die that face the coming out end face of the workpiece form a common plane.

It is recommended that the machining surface of the workpiece and the cutting surface of the cutting tool be in the same plane.

The receiving jig is preferably fixed to the chuck in a replaceable manner, and the co-cutting tool is preferably fixed to the receiving jig in a replaceable manner.

The present invention provides a gear cutting device that can suppress the generation of burrs on the cut end surface of the workpiece, prevent wear on the members that support the workpiece, and ensure high durability.

1 is a cross-sectional view illustrating a main part of a gear machining device according to an embodiment of the present invention together with a workpiece. FIG. 2 is a cross-sectional view showing a state in which the workpiece in FIG. 1 is cut by a cutting tool to machine a gear. FIG. FIG. 3 is a cross-sectional view showing a state where the workpiece has been cut and the machining of the gear has been completed subsequent to FIG. 2 . FIG. 4 is a cross-sectional view showing the state in which the workpiece after machining of the gear in FIG. 3 has been removed.

The preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific values shown in the embodiment are merely examples to facilitate understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid duplicated explanations, and elements not directly related to the present invention are not illustrated.

Figure 1 is a cross-sectional view illustrating the main parts of a gear machining device 100 according to an embodiment of the present invention, together with a workpiece 102. The figure shows how the workpiece 102, which is the object to be machined, is attached to the gear machining device 100. Figure 2 is a cross-sectional view showing how the workpiece 102 in Figure 1 is cut by a cutting tool 104 to machine a gear.

As shown in FIG. 2, the gear machining device 100 holds the workpiece 102 and moves a cutting tool 104 such as a skiving cutter relative to the workpiece 102 in a direction in which a tooth groove is formed in the workpiece 102 (hereinafter referred to as the tooth groove direction), and in this embodiment, cuts a tooth groove 131 into the inner surface 105 of the workpiece 102 to machine a gear.

As shown in FIG. 1, the gear machining device 100 includes a chuck 106 for holding the workpiece 102, a receiving jig 108, and a co-machining tool 110. The chuck 106 has a base 112 and two or more claws 114, 114 attached to the base 112. The claws 114, 114 are slidable relative to an end surface 118 of the base 112, and can move toward each other (see arrows A and B in FIG. 1) or away from each other (see arrows C and D in FIG. 4).

The receiving jig 108 is a member that can be made of a high-hardness material that has been subjected to heat treatment, and is replaceably fixed to the base 112 of the chuck 106 by bolts 120 as shown in FIG. 1. The surface of the receiving jig 108 that faces the workpiece 102 is referred to as the first support surface 122. Here, the end surface of the workpiece 102 on the side where the cutting tool 104 comes out at the end of machining is referred to as the "removal end surface 124."

The first support surface 122 of the receiving jig 108 is a surface that abuts against the end surface 124 of the workpiece 102, and as shown in FIG. 2, abuts against a position (range) of the end surface 124 that is not cut by the cutting tool 104, i.e., a non-cutting position of the cutting tool 104, thereby supporting the end surface 124.

The co-cutting die 110 is a member that is cut together with the workpiece 102 by the cutting tool 104, and is made of the same hardness or tempered material as the workpiece 102 so as not to damage the cutting tool 104. The co-cutting die 110 is also fixed to the receiving jig 108 by bolts 126 so that it can be replaced.

The surface of the co-cutting die 110 facing the workpiece 102 is called the second support surface 128. The second support surface 128 is a surface that abuts against the end surface 124 of the workpiece 102. As shown in FIG. 2, the second support surface 128 abuts against the position of the end surface 124 that is cut by the cutting tool 104 (the range including the tooth groove 131 and its periphery), i.e., the cutting position of the cutting tool 104, to support the end surface 124 and to be co-cut together with the workpiece 102 by the cutting tool 104. Furthermore, the first support surface 122 of the receiving jig 108 and the second support surface 128 of the co-cutting die 110 are in a common plane. Furthermore, as shown in FIG. 2, the inner peripheral surface 105, which is the machining surface of the workpiece 102, and the co-cutting surface 111 of the co-cutting die 110 are in the same plane. The co-cutting surface 111 is the inner peripheral surface of the co-cutting die 110.

In the gear processing device 100, the workpiece 102 is brought closer to the first support surface 122 of the receiving jig 108 and the second support surface 128 of the common cutting tool 110, which are in a common plane, as shown by arrows E and F in FIG. 1, and the removal end surface 124 of the workpiece 102 is brought into contact with the first support surface 122 and the second support surface 128 as shown in FIG. 2. This causes the removal end surface 124 of the workpiece 102 to be supported by the receiving jig 108 and the common cutting tool 110.

Then, the jaws 114, 114 of the chuck 106 are brought close to each other as indicated by arrows A and B in FIG. 1, and the outer peripheral surface 130 of the workpiece 102 is held as shown in FIG. 2. In this manner, the workpiece 102 can be attached to the gear machining device 100.

Figure 3 is a cross-sectional view showing the state after cutting the workpiece 102 and completing the gear machining following Figure 2. The gear machining device 100 cuts the inner peripheral surface 105 of the workpiece 102 with a cutting tool 104 as shown in Figure 2, and further cuts a notch 132 into a part of the co-cutting die 110 together with the tooth groove 131 of the workpiece 102 as shown in Figure 3, thereby completing the gear machining.

Furthermore, in the gear machining device 100, as described above, the first support surface 122 of the receiving jig 108, which faces the end surface 124 of the workpiece 102, and the second support surface 128 of the cutting tool 110 are in a common plane, and the end surface 124 of the workpiece 102 is in contact with both the first support surface 122 and the second support surface 128, as shown in Figures 2 and 3.

As a result, when the gear machining device 100 cuts the workpiece 102 to machine a gear, no gap is generated between the end surface 124 of the workpiece 102 and the opposing receiving jig 108 and co-cutting die 110, so burrs can be prevented from being generated on the end surface 124 of the workpiece 102.

Here, in the gear machining device 100, the members that support the workpiece 102 are the receiving jig 108 and the co-cutting die 110, as shown in Figures 2 and 3. The co-cutting die 110 is made to have the same hardness as the workpiece 102 or is a tempered material so as not to damage the cutting tool 104, while the receiving jig 108 can be made of a high-hardness material that has been subjected to heat treatment or the like. As a result, in the gear machining device 100, the receiving jig 108 can bear the load received from the cutting tool 104 when cutting the workpiece 102 to machine the gear, thereby reducing wear on the co-cutting die 110.

Therefore, the gear machining device 100 can suppress the generation of burrs on the cut end surface 124 of the workpiece 102, while preventing wear on the members supporting the workpiece 102 and damage to the cutting tool 104, thereby ensuring high durability.

In the gear machining device 100, as shown in FIG. 2, the inner peripheral surface 105, which is the machining surface of the workpiece 102, and the co-cutting surface 111 of the co-cutting die 110 are flush with each other. Therefore, in the co-cutting die 110, the second support surface 128 is securely abutted against the cutting position of the removal end surface 124 of the workpiece 102 that is to be cut by the cutting tool 104, supporting the removal end surface 124, and the second support surface 128 and the co-cutting surface 111 are securely co-cut together with the workpiece 102 by the cutting tool 104.

Figure 4 is a cross-sectional view showing the state in which the workpiece 102 in Figure 3 has been removed after the gear machining has been completed. In the gear machining device 100, the claws 114, 114 of the chuck 106 are moved away from each other as shown by arrows C and D, allowing the workpiece 102 after the gear machining has been completed to be removed.

In addition, when cutting a new workpiece to machine a gear (in the case of second or subsequent machining), if the cutting tool 104 is not replaced even when the workpiece 102 is replaced, the phase of the co-cutting die 110 in which the notch 132 has already been cut will match the phase of the cutting tool 104.

Therefore, when cutting the tooth groove 131 in the second or subsequent machining, the blade of the cutting tool 104 passes through the already formed notch 132, and the co-cutting die 110 is not cut. However, the uncut portion of the co-cutting die 110 serves as a backing for the tooth profile of the new workpiece. Therefore, with the gear machining device 100, even in the second or subsequent machining, it is possible to continue to prevent burrs from being generated on the removal end surface 124 of the workpiece 102.

In addition, in the gear machining device 100, the receiving jig 108 is fixed to the chuck 106 in a replaceable manner, and the co-cutting die 110 is fixed to the receiving jig 108 in a replaceable manner. Therefore, in the gear machining device 100, even if the receiving jig 108 and the co-cutting die 110 wear out after cutting a large number of workpieces 102 to machine gears, they can be replaced individually.

The gear machining device 100 described above is configured to machine a gear by cutting tooth grooves 131 on the inner peripheral surface 105 of the workpiece 102, but is not limited to this and may also be used to machine external teeth by cutting tooth grooves on the outer peripheral surface of the workpiece 102.

Although the preferred embodiment of the present invention has been described above with reference to the attached drawings, it goes without saying that the present invention is not limited to such an example. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

The present invention can be used as a gear machining device that cuts a workpiece by moving a tool to machine a gear.

100... gear machining device, 102... workpiece, 104... cutting tool, 105... inner surface of workpiece, 106... chuck, 108... receiving jig, 110... co-cutting tool, 111... co-cutting surface, 112... base, 114... claw portion, 118... end surface of base, 120, 126... bolt, 122... first support surface of receiving jig, 124... end surface of workpiece, 128... second support surface of co-cutting tool, 130... outer surface of workpiece, 131... tooth groove, 132... notch of co-cutting tool

Claims (3)

In a gear machining device which cuts a workpiece by moving a tool to machine a gear,
When the end face of the workpiece on the side where the tool comes out at the end of machining in the moving direction of the tool is called the "coming out end face,"
A chuck for holding the workpiece;
a receiving jig that abuts against a non-cutting position of the tool on the end surface of the workpiece and supports the end surface;
a cutting tool that is in contact with a cutting position of the cutting end surface of the workpiece by the tool to support the cutting end surface and is cut together with the workpiece by the tool;
A gear machining device characterized in that the surfaces of the receiving jig and the common cutting die facing the removal end surface of the workpiece form a common plane. The gear machining device according to claim 1, characterized in that the machining surface of the workpiece and the co-cutting surface of the co-cutting die are in the same plane. The receiving jig is fixed to the chuck in a replaceable manner,
2. The gear machining device according to claim 1, wherein the common cutting die is fixed to the receiving jig in a replaceable manner.

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