Tip dresser blades

Abstract

To provide a tip dresser that can make an appropriate current flow through a welded portion and apply a voltage thereto at the time of resistance welding.SOLUTION: A blade tool of a tip dresser has: a rod-like member 10 having a constriction part obtained by constricting a center portion of a side surface of a rod in a length direction; and means for causing revolution around a constriction part 11 of the rod-like member 10 and causes the rod-like member 10 to perform autorotation around an axis connecting both ends of the rod. The constriction part 11 has a cutting tool for cutting. By causing revolution and autorotation of the constriction part 11, an object to be cut is cut by the cutting tool.SELECTED DRAWING: Figure 1

Description

Technical Field

[0005] , , ,

[0001] The present invention relates to a tool of a tip dresser.

Background Art

[0002] A tip dresser is, for example, a cutting device that cuts the tip of an electrode for resistance welding, particularly spot welding. When an electrode for spot welding is pressed against the tool of the tip dresser and rotated for cutting, a protruding cutting residue may occur at the center of the tip of the electrode. (Patent Document 1

[0002] ). It is known that this cutting residue occurs because the cutting speed becomes zero or nearly zero near the rotation center of the tool.

[0003] That is, as shown in FIG. 7, the shapes of the tools 101 and 102 of a normal tip dresser 100 are such that the substantially semi-circular tips of a pair of opposing electrodes 103 and 104 for spot welding can be substantially fitted to the tools of the tip dresser.

[0004] Then, the tool of the tip dresser is rotated using a gear by a motor 105 or the like. That is, when the rotation shaft 106 of the motor 105 is rotated in the direction of arrow R, the first gear 107 rotates in the direction of arrow R, and the first engagement portion 108 of the first gear 107 engages with the second engagement portion 109 of the tip dresser 100, driving the tip dresser 100. That is, for example, the tip dresser 100 rotates the rotation shaft 110 in the direction of arrow R1.

[0005] By this rotation, the tool 101 of the tip dresser 100 cuts the tip of the electrode 103 for spot welding, and the tool 102 of the tip dresser 100 cuts the electrode 104 for spot welding. However, near the rotation center of the tools 101 and 102 of the substantially circular tip dresser 100, since the cutting speed becomes zero or nearly zero, cutting residues may occur on the electrodes 103 and 104 for spot welding.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] Japanese Patent Application Publication No. 7-009166 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] When the above-mentioned remaining material is removed, it becomes difficult to apply the appropriate current and voltage to the area to be welded during resistance welding.

[0008] Therefore, the object of the present invention is to provide a tip dresser and its cutting tool that can apply an appropriate current and voltage to the area to be welded when performing resistance welding. [Means for solving the problem]

[0009] To achieve the above objective, the present invention's chip dresser Cutting tools for teeth, The device comprises a single rod-shaped member having a constricted portion formed by narrowing the longitudinal center of the side surface of the rod, and means for causing the rod-shaped member to revolve around the constricted portion as the center of rotation, while rotating the rod-shaped member on an axis connecting both ends of the rod. This makes it possible to cause the constricted portion to revolve and rotate, and the constricted portion is shaped to have a cutting tool for cutting, making it possible to cut the workpiece with the constricted portion.

[0010] Here, the constricted portion of the rod-shaped member may be made of a grinding wheel, allowing the workpiece to be cut at the constricted portion.

[0011] To achieve the above objective, the cutting tool for the chip dresser of the present invention has a single rod-shaped member having a constricted portion in which the longitudinal center of the side surface of the rod is narrowed, and the constricted portion of the rod-shaped member is shaped to have a cutting tool for cutting, and the workpiece to be cut can be cut with the constricted portion.

[0012] To achieve the above objective, the cutting tool for the chip dresser of the present invention has a single rod-shaped member having a constricted portion formed by narrowing the longitudinal center of the side surface of the rod, and the constricted portion of the rod-shaped member is made of a grinding wheel, making it possible to cut the workpiece with the constricted portion. [Effects of the Invention]

[0013] The present invention provides a tip dresser and its cutting tool that can apply an appropriate current and voltage to the area to be welded during resistance welding.

Brief Description of Drawings

[0014] [Figure 1] It is an exploded perspective view of a chip dresser according to an embodiment of the present invention. [Figure 2] It is a plan view of a chip dresser according to an embodiment of the present invention. [Figure 3] It is a cross-sectional view taken along line C-C of FIG. 2. [Figure 4] It is a cross-sectional view taken along line D-D of FIG. 2. [Figure 5] It is a perspective view of a rod-shaped member of a chip dresser according to an embodiment of the present invention. [Figure 6] It is a cross-sectional view taken along line E-E of FIG. 5. [Figure 7] It is a view showing the configuration of a conventional chip dresser. Note that this figure is originally a cross-sectional view and should be hatched, but since each element would be hidden by the hatching, it is schematically drawn as a front view.

Modes for Carrying Out the Invention

[0015] (Configuration of Chip Dresser) Hereinafter, the configuration of the chip dresser of the present embodiment will be described based on FIGS. 1, 2, 3, and 4. First, the chip dresser 1 has a rod-shaped member 10. The rod-shaped member 10 has a constricted portion 11 that constricts the central portion in the longitudinal direction of the side surface of the rod. A cutting tool of the chip dresser 1 will be formed in this constricted portion 11. However, the details of the cutting tool will be depicted in FIGS. 5 and 6, and in FIGS. 1, 2, 3, and 4, only the general shape of the constricted portion 11 is depicted without depicting the details such as the shape of the cutting tool.

[0016] And the chip dresser 1 has means for rotating the rod-shaped member 10 about an axis connecting both ends of the rod while revolving the constricted portion 11 of the rod-shaped member 10 as a rotation center. This means can be realized, for example, by the following configuration.

[0017] First, the rod-shaped member 10 is accommodated in the through holes 13, 13 of the accommodating member 12 so that the constricted portion 11 is exposed from the window portion 14 which becomes the hole portion of the accommodating member 12. The window portion 14 of the accommodating member 12 is also formed at a position facing the window portion 14 on the side surface of the accommodating member 12 that is not shown in FIG. 1.

[0018] Then, bevel gears 16 and 17 are respectively attached to the bevel gear mounting portions 15a and 15b at both ends of the rod-shaped member 10. The bevel gear mounting portion 15a and the bevel gear 16 are arranged such that the pin 18 penetrates through the rotation axis of the bevel gear 16 and the rod-shaped member 10, and the two are rotatably fixed. The bevel gear mounting portion 15b and the bevel gear 17 are integrally formed or fixed to each other non-rotatably with an adhesive or the like.

[0019] In the state where the bevel gears 16 and 17 are respectively attached, the bevel gears 16 and 17 are arranged outside the through holes 13, 13. Then, the rod-shaped member 10 is fixed so that the bevel gears 16 and 17 can rotate. The bevel gear 17 will rotate together with the rod-shaped member 10. Also, the bevel gear 16 rotates freely and independently without accompanying the rotation of the rod-shaped member 10.

[0020] Then, the inner surface 19a of the annular bearing 19 and the outer surface of the wall portion 21 formed on the cylinder of the annular first cover member 20 are overlapped, and the outer surface 19b of the bearing 19 is rotatable in the circumferential direction along the circle of the wall portion 21, and the inner surface 19a of the bearing 19 is fixed in position along the circle of the wall portion 21.

[0021] This bearing 19 uses a ball bearing 19c. And it has a circular gear portion 23 formed at the edge of the hole 22 of the first cover member 20. This gear portion 23 is directed such that the teeth face the center of the circle of the outer shape of the first cover member 20.

[0022] And it has a circular gear portion 27 formed at the edge of the hole 26 of the annular second cover member 25 having a cylindrical wall portion 24. This gear portion 27 is directed such that the teeth face the center of the circle of the outer shape of the second cover member 25.

[0023] Then, the first cover member 20 is fitted onto the second cover member 25. During this fitting, the annular outer surface 19b of the bearing 19 slides against the inside of the wall portion 24. Also, during this fitting, the housing member 12 is positioned so that the gear portion 23 and the gear portion 27 mesh with the bevel gears 16 and 17. The bearing 19 plays a role in ensuring smooth rotation between the first cover member 20 and the second cover member 25.

[0024] In this way, the teeth of gear section 23 and gear section 27 can rotate while both bevel gears 16 and 17 mesh with each other. That is, by rotating the teeth of gear section 23 and gear section 27 while the bevel gears 16 and 17 mesh with each other, the rod-shaped member 10 can revolve around the constricted portion 11 as its center of rotation. When the rod-shaped member 10 is housed in the housing member 12, this revolve follows the arrow R2 in Figure 1. When the rod-shaped member 10 is housed in the housing member 12, the rotation of the housing member 12 along the arrow R2 in Figure 1 means that the rod-shaped member 10 "revolves around the constricted portion 11 as its center of rotation."

[0025] Furthermore, the bevel gear 16 rotates together with the rod-shaped member 10, causing the rod-shaped member 10 to rotate around the axis connecting both ends of the rod. This rotation is along the arrow R3 in Figure 1. The above is an example of a means by which the tip dresser 1 revolves around the constricted portion 11 of the rod-shaped member 10 as the center of rotation, while simultaneously causing the rod-shaped member 10 to rotate around the axis connecting both ends of the rod.

[0026] Then, as shown in Figures 5 and 6, the constricted portion 11 is shaped to have pointed portions 35a and 35b so as to become a cutting tool 34, and the constricted portion 11 is made to revolve and rotate so that the cutting tool 34 cuts the workpiece. Here, the number of non-cutting workpieces is not limited in principle, and can be one or more or two or more. The overall shape of the cutting tool 34 is such that the cutting tool 34 has an S-shaped cross-section and its pointed portions 35a and 35b extend in the longitudinal direction of the constricted portion 11. In other words, the tips of the two pointed portions 35a and 35b extend in a long, slender, and continuous manner in the longitudinal direction of the constricted portion 11.

[0027] (How the chip dresser 1 operates in this embodiment) When operating the chip dresser 1, first, the cutting tool 34 of the chip dresser 1 is made to revolve and rotate. Next, the cutting tool 34 is clamped with electrodes 103 and 104 shown in Figure 7. Then, electrodes 103 and 104 shown in Figure 7 are inserted into the two window sections 14 shown in Figure 2.

[0028] Then, this state is maintained for a predetermined time. Next, the clamps on the cutting tools 34 of electrodes 103 and 104 shown in Figure 7 are released. Finally, the revolution and rotation of the cutting tool 34 of the chip dresser 1 are stopped.

[0029] (Main effects obtained by this embodiment) The tip dresser 1 of this embodiment has a means for rotating the rod on an axis connecting both ends while revolving around the constricted portion 11 where the cutting tool 34 is located. As a result, the cutting speed near the rotation center of the cutting tool 34 of the tip dresser 1 is never zero or close to zero, and no or very little cutting residue is left on the electrode for spot welding, etc. Therefore, it is possible to provide a tip dresser 1 that can apply an appropriate current and voltage to the area to be welded when performing resistance welding.

[0030] Furthermore, the constricted portion 11 of the rod-shaped member 10 is rounded, as shown in the figure. Therefore, as the rod-shaped member 10 revolves and rotates, it can move along the tip shape of an electrode such as a spot welding electrode with a rounded tip, preventing excessive cutting and allowing only the necessary cutting to be performed.

[0031] Furthermore, the tip dresser 1 is less likely to apply eccentric loads to electrodes 103 and 104 shown in Figure 7. In addition, the tip dresser 1 can be made structurally smaller. As a result, in welding guns with narrow cuffs, interference from the cuffs will not, or will not, cause electrodes 103 and 104 shown in Figure 7 to fail to reach the cutting tool 34.

[0032] (Other forms) The chip dresser 1 according to the above-described embodiment is an example of a preferred form of the present invention, but is not limited thereto, and various modifications can be made without changing the gist of the present invention.

[0033] For example, the rod-shaped member 10 including the constricted portion 11 does not require the use of a cutting tool 34. Here, cutting means using a cutting tool 34 and cutting means not using a cutting tool 34 are collectively referred to as "cutting tools." For example, the material of at least the constricted portion 11 of the rod-shaped member 10 can be a grinding wheel. Since a grinding wheel is a stone with a rough surface, its roughness allows it to be used to cut electrodes for spot welding, etc.

[0034] Furthermore, as described above, when using a grinding wheel instead of the cutting tool 34, the operation of the chip dresser 1 in this embodiment can be performed in addition to the operation when using the cutting tool 34, for example, the following operation methods can be applied.

[0035] For example, one method involves clamping the grinding wheel with the two electrodes 103 and 104 shown in Figure 7, and then rotating the grinding wheel. Another method involves clamping the grinding wheel with the two electrodes 103 and 104 shown in Figure 7, rotating the grinding wheel for a certain period of time, stopping the rotation, and then releasing the grinding wheel from the clamp. Furthermore, one can also employ a method in which the pair of electrodes 103 and 104 are pressed against the grinding wheel one at a time. The last method does not require clamping the grinding wheel with the two electrodes 103 and 104.

[0036] Of course, the cutting tool for the chip dresser may have a rod-shaped member, with the central part of the rod-shaped member being made of a grinding stone, and the workpiece to be cut being cut at the central part. Also, the central part made of a grinding stone may have the shape of the constricted part 11 at the position of the constricted part 11. Furthermore, the part of the cutting tool made of a grinding stone other than the central part of the rod-shaped member may or may not be made of a grinding stone.

[0037] Furthermore, an example was shown in which a constricted portion 11 is formed in the longitudinal center of the rod-shaped member 10. However, the shape of the electrodes of resistance welding devices such as spot welding devices can be various shapes other than rounded shapes. For example, if the tip shape of the electrode is flat, it is preferable to adopt a cylindrical shape for the rod-shaped member 10 in order to "avoid excessive cutting" as described above. This is also true when the longitudinal center of the rod-shaped member 10 is made of a grinding wheel.

[0038] Furthermore, if the tip of the electrode is concave, it is preferable for the rod-shaped member 10 to have a shape in which the central part in the longitudinal direction is more bulging than other parts, in order to "avoid excessive cutting" as described above. This "bulging shape" can be a rounded bulge, or the rod-shaped member 10 can be a rectangular bulge without being rounded, etc. The same applies when the central part in the longitudinal direction of the rod-shaped member 10 is made of a grinding wheel.

[0039] Furthermore, the constricted portion 11 does not necessarily have to have the pointed portions 35a and 35b of the cutting tool 34. If it does have pointed portions of the cutting tool 34, the number of pointed portions of the cutting tool 34 may be one, but this is also acceptable. Moreover, the number of pointed portions of the cutting tool 34 can be three, four, five or more.

[0040] Furthermore, the overall shape of the cutting tool 34 is S-shaped in cross-section, as shown in Figure 6. However, the overall shape of the cutting tool 34 can be other than S-shaped in cross-section, such as a rod-shaped, arc-shaped, L-shaped, or W-shaped cross-section.

[0041] Furthermore, the bearing 19 is not necessarily required and can be omitted from the configuration of the tip dresser 1. Of course, it is preferable to use the bearing 19 to ensure smooth rotation between the first cover member 20 and the second cover member 25, but if that smoothness can be ensured by other components, the bearing 19 is not necessary.

[0042] Furthermore, pin 18 can also be removed from the configuration of the tip dresser 1. If there is another configuration for rotatably fixing the bevel gear mounting portion 15a and the bevel gear 16, pin 18 is unnecessary.

[0043] Furthermore, the chip dresser 1 of this embodiment has a means for revolving around the constricted portion 11 where the cutting tool 34 is located as the center of rotation, while also rotating on an axis connecting both ends of the rod as the axis of rotation. In this embodiment, the movement of the cutting tool 34 is achieved by the meshing of gears. However, other means of movement can be selected, such as the movement of the cutting tool 34 by the rolling of wheels, instead of the movement of the cutting tool 34 by the meshing of gears. [Explanation of symbols]

[0044] 10 Rod-shaped member 11. Constricted area 34 Cutting tools

Claims

1. A single rod-shaped member having a constricted portion formed by narrowing the longitudinal center of the side surface of the rod, The rod-shaped member has means for revolving around the constricted portion of the rod-shaped member as the center of rotation, while also rotating the rod-shaped member on an axis connecting both ends of the rod. The constricted portion can be made to revolve and rotate, The constricted portion is shaped to have a cutting tool for cutting, and the constricted portion is capable of cutting the workpiece. Cutting tools for tip dressers.

2. A cutting tool for a tip dresser according to Claim 1, The constricted portion of the rod-shaped member is made of a grinding wheel, and the constricted portion is capable of cutting the workpiece. Cutting tools for tip dressers

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