JP2007216230A - Electrode chip shaping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode chip shaping device capable of reliably recovering the electric characteristic of an electrode chip degraded attributable to wear, alloy deposition or the like even when welding a body to be welded which easily forms an alloy between the electrode chip and the body while maintaining high productivity (working efficiency). <P>SOLUTION: The electrode chip shaping device for shaping a fore end part of an electrode chip CP in a conical shape comprises a four-blade type square end mill EM as an end mill for flat machining, and a cutting device 10 (a two-blade turning chip dresser) for cutting a side face of a fore end of the chip CP and machining the side face in a conical shape based on the relative turn to the electrode chip CP, which are switchable through the replacement of the position with respect to the predetermined machining position (immediately below a shaft SF2). In more detail, these cutting means (the square end mill EM and the cutting device 10) are replaced through the sliding movement of the shaft SF1 in the axial direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrode tip shaping device for shaping the tip portion of an electrode tip into a cone shape, and more particularly to an electrode tip shaping device suitable for use in shaping an electrode tip used in spot welding.

  First, an example of spot welding that has been generally performed will be described with reference to FIG. In addition, FIG. 10 is a side view which shows an example of the spot welding apparatus generally used conventionally.

  As shown in FIG. 10, this apparatus is mainly configured by providing a welding machine SP at the tip of a robot arm RT. More specifically, here, the welding machine SP has a slide mechanism and a C-shaped arm 2 (fixed arm) that forms a space for receiving a welded body BD (for example, a metal plate used for automobile parts) at the center. And a movable arm 1 that enables a close and reciprocating motion (reciprocating motion) with respect to the space. A conical electrode chip CP (electrode chip pair) made of, for example, a copper alloy or the like is attached to the tips of the arms 1 and 2 via appropriate adapters AD. As such an electrode tip CP, for example, as shown in FIG. 11 (a), a cone-shaped (umbrella-shaped) electrode tip in which the apex portion of a cone is processed flat, or in FIG. 11 (b). As shown, a cone-shaped (dome-shaped) electrode tip or the like in which the apex portion of a cone whose side surface bulges outward is processed flat is used.

  For example, when spot welding is performed using such an apparatus, a plurality of (usually two) overlapped objects to be welded BD are inserted into a welding position (C-shaped central space). Based on the sliding motion of the arm 1, the electrode chip CP (electrode chip pair) is clamped. Next, the electrode tip CP is energized while applying a certain pressure to the welded body BD. In this way, when the electrode tip CP is energized, the to-be-welded body BD is locally melted by resistance heat, and the portion receiving the pressure from the electrode tip CP is pressed into a point shape. It will be. At this time, the energization amount of the electrode tip CP is usually set (optimized) to an appropriate current amount in advance in the welding machine SP. For this reason, in continuously performing stable welding, in the electrode tip shown in FIGS. 11A and 11B, the dimension (diameter) D of the flat portion corresponding to the cone apex is always constant. It is desirable to be constant.

  Thus, spot welding is generally performed using the electrode tip CP. However, this electrode tip CP is usually easy to wear (for example, crushed deformation accompanying an increase in the number of hit points), and easily forms an alloy with the welded body BD (for example, the welded body BD is a galvanized iron plate, When the electrode tip CP is a copper alloy, an alloy of copper alloy and zinc is formed on the tip of the tip CP at about “1 mm”). Therefore, it is necessary to recover (regenerate) the deteriorated electrical characteristics.

  In particular, the adhesion of the alloy to the electrode tip is a problem that cannot be ignored in obtaining high reliability. For example, a copper alloy that is generally widely used as the electrode tip is easy to form an alloy with another metal (for example, zinc), and forms an alloy with another metal (to-be-welded body) rather than cheap chrome copper. As a difficult material, alumina-dispersed copper has been developed. However, it is still not enough and the cost is high.

Therefore, conventionally, as described in Patent Document 1, for example, a method of recovering deteriorated electrical characteristics by shaping the tip portion of an electrode tip is known. That is, the tip portion of the electrode tip is shaved using a two-blade rotary tip dresser (shaping device), and the tip portion of the electrode tip is formed into the original cone shape (for example, see FIG. 11). Thereby, the alloy adhering to the tip portion is scraped off, and the shape is formed (restored) to the original shape.
JP-A-5-305457

  As described above, according to the above-described method, the electrical characteristics of the electrode tip deteriorated due to the above-described wear, adhesion of the alloy, and the like are restored to some extent. However, when the tip portion of the electrode tip is shaped into a conical shape, in a conventional two-blade rotary tip dresser (see, for example, Patent Document 1), residual chips and the like adversely affect cutting, The alloy is often left in the vicinity of the tip surface (the top surface corresponding to the apex of the cone), and the electrical characteristics of the electrode tip have not been completely recovered.

  Therefore, the tip surface (top surface of the cone) of the electrode tip is manually shaved using, for example, a scissors (file), etc. (usually this operation takes “60 seconds” or more), and then the tip In order to keep the width of the flat part corresponding to the apex of the cone (for example, the dimension D in FIG. 11) constant, the tip side surface of the electrode tip is scraped (squeezing the tip part) using an appropriate tip dresser. Things are also done. However, this method has poor work efficiency and is not suitable for mass production. For this reason, there is still a demand for a method with higher productivity (working efficiency).

  The present invention has been made in view of such circumstances, and wear is maintained even when welding an object to be easily formed of an alloy with an electrode tip while maintaining high productivity (working efficiency). It is an object of the present invention to provide an electrode tip shaping device that can more reliably recover the electrical characteristics of an electrode tip that has deteriorated due to adhesion of an alloy or an alloy.

  In order to achieve such an object, the invention described in claim 1 is based on the fact that a plurality of objects to be welded (for example, the surface of an iron plate plated with zinc) are pressed and clamped from both sides and energized. The tip of the electrode tip pair for spot welding of the welded body has a conical shape (for example, a cone-shaped umbrella shape (see, for example, FIG. 11A)), and the side surface of the cone bulges outward (curved). As an electrode tip shaping device for shaping into a semicircular dome shape (for example, see FIG. 11B), the tip surface of the tip is shaved based on the relative rotation with the electrode tip. In order to narrow the tip portion of the electrode tip and an end face processing means (for example, an end mill or a file) for processing the end face flatly, the tip side surface of the tip is scraped based on relative rotation between the electrode tip and the electrode tip. Add the same side to a cone A side surface machining unit which, through interchange positions with respect to a predetermined processing position, a configuration provided to be switchable.

  According to such a configuration, the two types of machining are appropriately performed on the tip portion of the electrode tip by switching between the two types of cutting means (end face machining means and side face machining means). That is, the tip surface of the electrode tip (the top surface of the cone) is processed flat by the end face processing means, and the tip side surface of the electrode tip is processed into a cone shape by the side processing means. For this reason, there is no need to manually cut the tip portion, and the working time can be greatly shortened. That is, according to such a configuration, while maintaining high productivity (working efficiency), welding is performed on the workpiece to be easily formed with the electrode tip, and the alloy is formed at the tip portion of the tip. Even if it adheres, the electrical characteristics of the electrode tip that has deteriorated due to wear, alloy adhesion, or the like can be recovered more reliably. Moreover, since it is possible to cut the tip tip surface more flatly and accurately than by manual work, the amount of cutting of the tip end face is cut to a minimum (the cutting amount of the normal part), and in turn The electrode tip can be used for a longer period.

  The above-mentioned “change of position relative to the machining position” can be realized by changing the position of the electrode tip (machining position) or changing the positions of the two types of cutting means. Can do. However, it is desirable to change the positions of the two types of cutting means in order to easily realize this with a simple configuration by using, for example, an existing drilling machine.

  Further, either the flat processing by the end surface processing means or the conical processing by the side processing means may be performed first. However, considering the workability at present, it is preferable to perform the flat processing first.

  Such an apparatus is particularly useful when used in an environment where an alloy is easily formed between the welded body and the electrode tip, for example, when the welded body is a galvanized plate and the electrode tip is a copper alloy. .

  In the apparatus according to the first aspect, it is effective to use a square end mill, which is an end mill for flat processing, as the end face processing means, as in the invention according to the second aspect.

  For example, when a file (file) is used, chips generated by cutting accumulates one after another, which disturbs cutting. For this reason, when using a scissors, it becomes necessary to remove the chips by airflow (air blowing) or the like. In this respect, the above-mentioned square end mill allows chips to escape smoothly from between the blades, so that the means for removing the chips can be simplified or omitted. Also, in view of efficient cutting, the square end mill is superior to the scissors.

  Moreover, in the apparatus according to claim 1 or 2, the side surface processing means is fixed to a cylindrical space for accommodating a tip portion of the electrode tip as in the invention according to claim 3. A cutter is provided, and when the electrode tip is accommodated in the cylindrical space, the tip side surface of the tip accommodated in the cylindrical space is scraped by the cutter based on relative rotation with the tip. It is effective to adopt

  If only the tip side surface of the electrode tip is processed into a conical shape, it is possible to use such a conventional so-called rotary tip dresser (for example, a two-blade), and since there is a track record, reliability, etc. It is also beneficial to think about this aspect.

  Moreover, in invention of Claim 4, in the apparatus as described in any one of said Claims 1-3, the said end surface processing means and the said side surface processing means are mounted | worn with one base, and these means are used. As means for enabling switching, a slide mechanism for sliding the pedestal is further provided.

  With such a configuration, the end surface processing means and the side surface processing means are slid together with the relative positional relationship maintained by the slide mechanism. For this reason, even if the electrode tip side is fixed, these means can be switched more easily and accurately.

  Further, in this case, as the sliding mechanism, as in the invention according to claim 5, for example, a mechanism that slides the pedestal by changing an other dynamic (for example, artificial) operation by an operator to a sliding motion is used. It is effective.

  The device described in claim 4 is effective as a particularly inexpensive device for reliably restoring the electrical characteristics of the electrode tip. That is, in this sense as well, a special actuator is not used (for example, a toggle clamp is used to generate power by an artificial operation) in order to realize a further inexpensive device, such as the device according to claim 5. It is effective to realize the slide mechanism with a simple configuration.

  In the apparatus according to any one of the first to fifth aspects, as in the invention according to the sixth aspect, the end surface processing means and the side surface processing means are both rotated relative to each other. The direction is fixed, and in addition to the above-described configuration, a rotational motion mechanism (for example, a rotational motion mechanism by a motor or the like) that powers the electrode chip to rotate it to cause the relative rotation. ) Is effective.

  With such a configuration, relative rotation for the shaving can be appropriately caused without providing a special actuator for the end face machining means and the side face machining means. That is, the end face processing means and the side face processing means can be realized at a lower cost with a simpler physique.

  In addition, in the apparatus according to any one of claims 1 to 6, for example, by changing a passive operation by an operator to a vertical motion, the electrode tip and each of the cutting means (the end face processing means and If the structure further includes an interval adjusting mechanism that moves the side surface processing means close to and away from (for example, either one of them up and down), the number of actuators that provide power is minimized (only the rotary motion mechanism that rotates the electrode tip). Therefore, the electrode tip shaping system can be realized accurately, which is very advantageous in terms of cost. Moreover, such a configuration can be easily realized by using an existing drilling machine (a drilling device using a rotary drill) or the like, for example, by mounting an electrode tip instead of the drilling machine.

  Hereinafter, an embodiment in which an electrode chip shaping device according to the present invention is embodied will be described with reference to FIGS. Also in the apparatus according to this embodiment, as in the conventional apparatus described above, the tip portion of the electrode tip CP for spot welding as illustrated in FIG. 10 is shaped into a cone shape (see, for example, FIG. 11). Assuming a device to do. That is, based on being energized by pressing and holding a plurality of workpieces from both sides, the electrode tip pairs for spot welding the workpieces are made of, for example, a copper alloy (chromium copper, alumina-dispersed copper, or the like). An electrode tip shaping device for shaping a tip portion of an electrode tip into a cone shape.

  First, an outline (schematic configuration) of an electrode chip shaping device according to this embodiment will be described with reference to FIGS. 1 and 2. Of these, FIG. 1 is a perspective view schematically showing the outline of the cutting part of the apparatus, FIG. 2A is a plan view of the cutting part, and FIG. 2B is a side view of the cutting part. FIG.

  As shown in each of these drawings, the cutting part of this apparatus is generally configured to have a thick plate-like base (base) BS (for example, a table of a drilling machine) having a rectangular outer shape (for example, a table of a drilling machine). The thickness direction of the base BS is the Z-axis direction, the short direction is the X-axis direction, and the long direction is the Y-axis direction).

  A substantially rectangular parallelepiped pedestal DZ is provided on the upper surface (one surface in the Z-axis direction) of the base BS, and this pedestal DZ can be guided in the Y-axis direction by two guides G. Is sandwiched between.

  Further, the cutting device 10 (side surface processing means) accommodated and held inside the holder HD extended above (Z axis direction) above the same surface on the upper surface (one surface in the Z axis direction) of the pedestal DZ. ) And a four-blade square end mill EM (end surface processing means) which is an end mill for flat processing extending above the same surface (in the Z-axis direction), in the direction of the shaft SF1 attached to the pedestal DZ They are assembled so as to be arranged in a line (on a straight line) in the (Y-axis direction). That is, at this cutting site, the cutting device 10 and the square end mill EM are both fixed so as not to rotate in the rotational direction with the axial direction (Z-axis direction) as the rotational axis.

  Then, the pedestal DZ is slid in the Y-axis direction through a slide mechanism (power unit will be described later) including the guide G and the like, whereby the two cutting means (the cutting device 10 and the square end mill EM). However, it is possible to switch.

FIG. 3 is an exploded view showing an example of a schematic structure of the cutting apparatus 10.
As shown in FIG. 3, the cutting apparatus 10 has two sheets having a recess (for example, an arcuate curve or a trapezoidal depression) in the center with respect to the in-cylinder space of the cylindrical housing 11. Blades 13a and 13b (cutters) are formed by being attached in a predetermined manner.

  Specifically, the housing 11 has a bottomed cylindrical shape in which one end corresponding to the lower side in FIG. 3 is closed, and the other end opened to the upper side in FIG. An accommodation ring (a stopper when accommodated in the holder HD) is provided. Further, a pair of holes 12 are provided in the cylindrical side wall at positions facing each other. Then, through the pair of holes 12, the two blades 13a and 13b partially overlap each other at the center (corresponding to the center axis of the housing 11) as shown in FIG. In this state, it is inserted into the housing 11 and attached to an appropriate position.

  That is, in this cutting apparatus 10, the electrode tips are accommodated in the cylindrical space (inside the cylinder) of the housing 11, so that the blades 13a and 13b are based on the relative rotation with the tip. Thus, at least the tip side surface of the chip accommodated in the cylindrical space is scraped (the top surface is also slightly shaved).

  FIG. 4 is a side view showing an example of a power unit of a slide mechanism used in the cutting part. The power unit of the slide mechanism is attached to the other end side of the base DZ of the shaft SF1 on the upper surface of the base BS, and is constituted by a so-called toggle clamp.

  As shown in FIG. 4, the power section (toggle clamp) of this slide mechanism is formed in a “shape” connected to the shaft SF1 along the Y-axis direction (recessed on the installation surface (base BS) side). ), A connection bar CT2 connected to the connection bar CT3 via a connection point P2, and a direction (YZ direction) that is acute with respect to the shaft SF1 (Y-axis direction) by the connection bar CT2. And a lever CT1 that is extended. Then, for example, when an operator performs an artificial (other dynamic) operation (for example, a downward pressing operation in FIG. 4) through the grip GP attached to the lever CT1, the force is changed to a slide motion. The pedestal DZ (FIG. 1) is slid in the axial direction of the shaft SF1 (for example, the Y-axis direction corresponding to the right side of FIG. 4). The shaft SF1 is inserted into the guide ring G1 fixed to the base BS, so that only the sliding movement in the left-right direction in FIG. 4 is allowed.

  Specifically, for example, when the operator holds the grip GP and pushes and pulls the lever CT1, the artificial force by the operator is applied to the shaft SF1 via the connecting bars CT2 and CT3 connected to the lever CT1. Communicated. That is, when the lever CT1 rotates with the point P1 as a fulcrum, the connecting bar CT2 also rotates together with this, and the rotating motion is converted into a slide movement by the connecting bar CT3 connected to the connecting bar CT2, and thus the shaft. SF1 slides in the right direction or the left direction in FIG. 4 (linearly along the guide ring G1) in response to the pushing operation or pulling operation of the lever CT1.

Hereinafter, the outline (schematic configuration) of the electrode tip shaping device and the electrode tip shaping mode by the same device will be described with reference to FIGS.
First, FIG. 5 is a side view schematically showing an outline (schematic configuration) of the entire apparatus.

  As shown in FIG. 5, in this apparatus, the base BS (drilling table) of the cutting part 100 shown in FIG. 1 and the like is substantially parallel to the vertical direction in the thickness direction (Z-axis direction). In other words, it is attached to a shaft SF3 (for example, the shaft of a drilling machine) that is held substantially horizontally and extends in the vertical direction (Z-axis direction) in the figure so as to be movable up and down, and is desired by a fixed knob SW. It can be adjusted (fixed) at a certain position (height). The shaft SF3 supports the shaft SF2 in an upper portion (not shown), and the shaft SF2 is rotated by being powered by a predetermined rotational motion mechanism (described later).

  Here, a cone-shaped (for example, see FIG. 11) electrode tip CP made of, for example, a copper alloy or the like is attached to the tip of the shaft SF2 via an appropriate adapter AD. Specifically, for example, as shown in FIG. 6, the electrode chip CP is connected and attached to the shaft SF <b> 2 in such a manner that the adapter AD is inserted into the hollow portion of the cylindrical electrode chip CP. As described above, the electrode tip CP is energized during use and is used for spot welding of a welded body BD (FIG. 10) made of, for example, an automobile part. That is, the electrode tip CP is removed from the above-described welder SP (FIG. 10) when shaping (shaping) (usually, shaping is required at “300 to 400” striking points), and the shaft SF2 is removed. Will be attached to.

FIG. 7 is a schematic diagram schematically showing the outline (schematic configuration) of the peripheral mechanism of the shaft SF2 (rotary shaft) shown in FIG.
As shown in FIG. 7, the electrode tip shaping device according to this embodiment is configured to rotate around the shaft SF2 by applying power to the shaft SF2 and thus the electrode tip CP to rotate it. A mechanism 20 (for example, a rotary motion mechanism of a drilling machine) and a vertical motion mechanism 30 (an interval adjustment mechanism, for example, a vertical motion of a drilling machine) that moves the electrode chip CP up and down by changing an artificial operation (another dynamic) by an operator to a vertical motion, for example. Motion mechanism).

  Specifically, the rotary motion mechanism 20 (rotary motion mechanism of the drilling machine) uses the power generated by the electric motor 21 through the predetermined pulleys 22 and 24 mediated by an appropriate belt 23 as the rotation shaft. It is configured to transmit to SF2. At this time, the rotation amount of the motor 21 is adjusted to a required rotation amount (for example, “1000 (rpm)”) by the diameter ratio of the pulleys 22 and 24.

  On the other hand, the vertical movement mechanism 30 (the vertical movement mechanism of the drilling machine) includes a rack 31 mounted on the shaft SF2 and a pinion (gear) 32 that engages with the rack 31. That is, in this mechanism, for example, when the lever 33 attached to the pinion 32 is rotated by an artificial (other dynamic) operation of the operator, the rack 31 and the pinion 32 that are engaged with each other are in cooperation. Further, the shaft SF2 moves up and down (moves upward or downward depending on the rotation direction of the lever 33).

FIG. 8 is a schematic diagram schematically showing a shaping mode of the electrode tip by the above apparatus.
As shown in FIG. 8, when the electrode tip CP is shaped by the above device, the tip end surface (top surface of the cone) of the electrode tip CP is flattened by the square end mill EM (see FIG. 8B). )), The tip side surface of the tip CP is processed into a cone shape (original normal shape) by the cutting device 10 (see FIG. 8A).

  Specifically, the operator operates the toggle clamp (FIG. 4) attached to the shaft SF <b> 1 (FIG. 1) in a state where the shaft SF <b> 2 serving as the rotation shaft is sufficiently lifted (upward in FIG. 5). Thus, the square end mill EM is moved to the machining position (directly below the shaft SF2) (sliding is moved to the left in FIG. 5 together with the base DZ). Next, when the operator operates the lever 33 (FIG. 7), the shaft SF2 is brought into contact with the position (square end mill EM) as shown in FIG. 8B through the above-described vertical movement mechanism 30 (FIG. 7). To a position where it can be processed). In this state, the shaft SF2 and eventually the electrode tip CP are rotated by the rotational motion mechanism 20 (FIG. 7), and the tip surface (top surface of the cone) of the electrode tip CP at the tip of the shaft SF2 is flattened. Process (for example, about “15 seconds”).

  Next, the shaft SF2 is sufficiently lifted again, and in this state, the operator operates the toggle clamp (FIG. 4) attached to the shaft SF1 (FIG. 1), so that the cutting device 10 is now moved to the machining position. It is moved (below the shaft SF2) (sliding in the right direction in FIG. 5 together with the base DZ). Next, when the operator operates the lever 33, the shaft SF2 is moved to the position shown in FIG. 8A (the blades 13a and 13b of the cutting device 10 (FIG. 3)) through the vertical movement mechanism 30 (FIG. 7). Down to the position where it can be processed by contacting. In this state, the shaft SF2 and eventually the electrode tip CP are rotated by the rotational motion mechanism 20 (FIG. 7), and the tip side surface of the electrode tip CP at the tip of the shaft SF2 is processed into a cone shape (original normal shape). To do. That is, as a result, the diameter of the cone apex (flat portion) of the electrode tip CP, which has been increased by the flat processing of the square end mill EM, is constricted to the original diameter.

  Thus, in this embodiment, the square end mill EM and the cutting device 10 as the cutting means are switched through the change of position (sliding movement of the pedestal DZ) with respect to a predetermined processing position (directly below the shaft SF2). By these cutting means, the alloy adhering to the tip portion is scraped off, and the shape is also formed (restored) to the original shape. That is, the diameter of the flat portion corresponding to the apex of the cone of the electrode chip CP (for example, see dimension D in FIG. 11) is maintained constant.

  Here, the machining position corresponding to just below the shaft SF2 is set as the movable limit of the toggle clamp (FIG. 4). That is, the operator can easily align the square end mill EM and the cutting device 10 to this processing position by operating the lever CT1 (pushing and pulling the lever CT1) (by the way, The direction orthogonal to the sliding direction is adjusted and fixed in advance). In addition, regarding the vertical alignment during processing, the regular height (processing height) is set as the movable limit of the lever 33 (FIG. 7), so that the square end mill EM and the cutting device 10 can be easily adjusted. The position (height) can be adjusted to this regular height.

  According to the electrode tip shaping device according to this embodiment described above, the following excellent effects can be obtained.

  (1) As a shaping device for the electrode tip CP that shapes the tip portion of the electrode tip CP into a cone shape, the tip end surface of the tip CP is shaved based on relative rotation with the electrode tip CP, and the end face is flattened. In order to narrow the tip end portion of the square end mill EM (end face processing means) to be processed and the electrode tip CP, the tip side surface of the tip CP is shaved based on the relative rotation between the electrode tip CP and the side surface is cut. The cutting device 10 (side surface processing means) for processing into a conical shape is configured to be switchable through a change of position with respect to a predetermined processing position (directly below the shaft SF2). This eliminates the need to manually cut the tip portion of the electrode tip CP and greatly shortens the work time (in the experiment, it took "60 seconds" manually. The time was reduced to “15 seconds” by performing the flattening process in step 1). In other words, according to such a configuration, a welded body (for example, a galvanized plate for a copper alloy chip, etc.) that easily forms an alloy with the electrode chip CP while maintaining high productivity (working efficiency). Even when welding is performed and an alloy adheres to the tip portion of the tip CP, the electrical characteristics of the electrode tip deteriorated due to wear, adhesion of the alloy or the like can be recovered more reliably.

  (2) Further, according to such an apparatus, the tip end surface of the chip can be cut flatly and more reliably and accurately than by manual work, and consequently the amount of useless cutting of the tip end surface of the chip is reduced. Will be able to. In other words, one electrode tip can be used for a longer period. As data to support this, if compared with a conventional shaping method (a method of shaving the top surface manually) by specific numerical values, for example, in the conventional case, it is about “3,000 to 4000” per one electrode chip. What has become unusable, in the above-described apparatus according to this embodiment, it has been confirmed by experiments that it can be used up to about “6000” hit points (galvanized plate was welded with a copper alloy chip). When data).

  (3) By adopting the square end mill EM, which is an end mill for flat processing, as the end surface processing means, it becomes possible to omit means (such as airflow) for removing chips. Also, in view of efficient cutting, the square end mill is excellent (a four-blade square end mill is particularly suitable in consideration of a load applied during cutting).

  (4) As side surface processing means, two blades 13a and 13b (cutter) fixed in a cylindrical space (inside the housing 11) for accommodating the tip portion of the electrode chip CP are provided, and an electrode is provided in the cylindrical space. When the chip CP is accommodated, at least the side surface of the tip CP accommodated in the cylindrical space by the blades 13a and 13b based on relative rotation with the chip CP (here, the chip CP rotates). The one that cuts the surface (the top surface can also be slightly cut) was used. If such a conventional so-called two-blade rotary tip dresser is used, it has a track record and is advantageous in terms of reliability and the like.

  (5) A slide mechanism (guide G, toggle clamp, etc.) that slides and moves the pedestal DZ as means for mounting the square end mill EM and the cutting device 10 on one pedestal DZ and switching the cutting means. Furthermore, it was set as the structure provided. With such a configuration, the square end mill EM and the cutting device 10 are slid together by the slide mechanism while maintaining a relative positional relationship (a positional relationship on the base DZ). For this reason, even in the configuration in which the electrode tip CP side is fixed (see FIG. 5), these cutting means can be switched more easily and accurately.

  (6) At this time, as the slide mechanism, a toggle clamp (FIG. 4) that slides the pedestal DZ by changing the other dynamic operation into a slide motion is used. By doing so, the slide mechanism is realized with a simpler configuration without using a special actuator, and as a result, a cheaper device is realized as an electrode chip shaping device using the mechanism. It will be.

  (7) Both the square end mill EM and the cutting device 10 are fixed in the rotational direction, and a rotational motion mechanism 20 (FIG. 7) is provided to apply power to the electrode tip CP to rotate it. did. With such a configuration, relative rotation for cutting (relative rotation between each cutting means and the electrode tip CP) without providing a special actuator with respect to the square end mill EM or the cutting apparatus 10. ) Can be appropriately generated. That is, these cutting means can be realized at a lower cost with a simpler physique.

  (8) Further, the configuration further includes a vertical movement mechanism 30 (interval adjustment mechanism) that moves the electrode tip CP up and down (moves each cutting means and the electrode chip CP close to and away from each other) by changing the passive operation to vertical movement. It was. As a result, an electrode chip shaping system that minimizes the number of actuators that provide power (only the rotary motion mechanism 20 (strictly, the motor 21) that rotates the electrode chip CP) can be realized accurately, and the cost can be reduced. In terms, it is very beneficial.

  (9) Since the movable limit of the toggle clamp and the vertical movement mechanism 30 is set in accordance with the normal position (processing position and processing height), it is easy to align the processing position and processing height.

  (10) The positions of the two types of cutting means (square end mill EM and cutting device 10) are changed. Then, the existing drilling machine (FIGS. 5 and 7) is used to realize the electrode chip shaping device (shaping system). By doing so, various mechanisms such as the rotary motion mechanism 20 and the vertical motion mechanism 30 can be easily realized.

  The embodiment described above may be modified as follows.

  The square end mill EM is not limited to a four-blade one, and may be a two-blade or five-blade, for example. Also, the diameter can be appropriately changed according to the shape of the electrode chip CP and the like. For example, it is possible to facilitate positioning by using a large diameter.

  In the above embodiment, the case where a drilling machine is used is mentioned, but this is not essential. For example, a lathe or the like may be used, and it is also possible to appropriately collect and create parts for each element constituting the shaping device.

  -Either flat processing by the square end mill EM or conical processing by the cutting device 10 may be performed first. That is, depending on the application, flat processing may be performed after the conical processing.

  An actuator (for example, a motor or the like) that rotates each cutting means (relatively rotating with respect to the electrode tip CP) may be provided for the square end mill EM or the cutting apparatus 10. And if it is such a structure, arrangement | positioning of the previous rotary motion mechanism 20 (FIG. 7) etc. is also omissible.

  -You may make it provide the up-and-down movement mechanism which moves these each cutting means up and down with respect to the square end mill EM and the cutting device 10 (each cutting means and electrode tip CP adjoin and separate). And if it is such a structure, arrangement | positioning of the up-and-down movement mechanism 30 (FIG. 7) etc. may be omitted. Further, any of these cases may be realized by providing an appropriate actuator (for example, a motor or a cylinder). In short, the configuration is basically arbitrary as long as the distance (interval) between each cutting means and the electrode tip CP can be adjusted.

  The slide mechanism that slides the base DZ is not limited to the one using the toggle clamp described above, and is arbitrary. For example, a worm gear or the like may be automatically slid by a motor. Also, the slide trajectory is not limited to a straight line, but may be slid to draw an arc-shaped trajectory. Furthermore, the guide G is not limited to the one holding the pedestal DZ, and for example, a rail may be laid under the pedestal DZ.

  Further, the replacement of the position of each cutting means with respect to a predetermined processing position (directly below the shaft SF2) is not limited to slide movement, and is a movement method using a rotation mechanism, for example, as shown in FIG. Also good. That is, in the apparatus shown in FIG. 9, the pedestal DZ rotates around the rotation axis RT in the direction of the arrow in the figure, so that the state shown in FIGS. 9A and 9B is obtained. Each cutting means (the square end mill EM and the cutting device 10) can be interchanged with each other. Further, at this time, if each cutting means is positioned with respect to the processing position through the engagement between the positioning pin BR formed integrally with the base DZ and the fixed stoppers ST1 and ST2, for example, the rotation mechanism is appropriately set. Even if it is realized and automated with this actuator, reliable and accurate positioning becomes possible.

  In addition, when replacing the position with respect to the processing position, it is not essential to change the positions of the two types of cutting means (square end mill EM and cutting device 10), and the electrode tip CP (shaft SF2) The position (processing position) may be changed (for example, a slide mechanism is provided on the shaft SF2).

  -By providing the square end mill EM and the cutting device 10 on the opposite surface of the base BS, for example, electrode tip pairs attached to a rotating shaft or a spot welding device may be simultaneously processed (shaped).

  -Depending on the application, instead of the square end mill EM, a file or other end mill can be used. The point is that the tip end surface of the tip CP can be cut based on relative rotation with the electrode tip CP, and the end surface can be processed flat.

  Further, as the above-described side surface processing means, in order to narrow the tip portion of the electrode tip CP, the tip side surface of the tip CP is shaved based on relative rotation with the electrode tip CP, and the side surface is conical. What is necessary is just to process into a shape.

  Further, the electrode tip to be shaped is not limited to the electrode tip used in the robot type spot welding apparatus illustrated in FIG. 10 above, for example, one used in a stationary spot welding apparatus It may be.

The perspective view which shows typically the outline | summary of the cutting part especially about one Embodiment of the shaping device of the electrode tip which concerns on this invention. (A) is a top view of the cutting site | part shown in FIG. 1, (b) is a side view of the cutting site | part shown in FIG. The exploded view which shows the schematic structure about an example of the cutting device used for the apparatus. The side view which shows the schematic structure about an example of the motive power part of the slide mechanism used for the apparatus. The side view which shows typically the outline | summary (schematic structure) of the whole apparatus which concerns on the same embodiment. The schematic diagram which shows the attachment aspect of an electrode tip. The schematic diagram which shows the outline | summary typically about the periphery mechanism of a rotating shaft. (A) And (b) is a schematic diagram which shows typically the shaping aspect of the electrode tip by the apparatus based on the embodiment. The top view which shows the switching aspect of a cutting means about the modification of the shaping device of the electrode tip which concerns on the embodiment. The side view which shows the outline | summary about an example of the spot welding apparatus (welding machine) generally used conventionally. (A) And (b) is a side view and a top view which show an example of the shape of an electrode tip, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Cutting device, 11 ... Housing, 12 ... Hole, 13a, 13b ... Blade, 20 ... Rotary motion mechanism, 21 ... Electric motor, 22, 24 ... Pulley, 23 ... Belt, 30 ... Vertical motion mechanism, 31 ... Rack, 32 ... Pinion (gear), 33 ... Lever, 100 ... Cutting part, AD ... Adapter, BD ... Body to be welded, BR ... Positioning pin, BS ... Base, CP ... Electrode tip, CT1 ... Lever, CT2, CT3 ... Connection bar , DZ ... pedestal, EM ... square end mill, G ... guide, G1 ... guide ring, GP ... grip, HD ... holder, RT ... rotary shaft, SP ... welding machine, SW ... fixed knob, SF1, SF2, SF3 ... shaft, ST1, ST2 ... stoppers.

Claims (6)

An electrode tip shaping device for shaping a tip portion of an electrode tip into a conical shape of an electrode tip pair for spot-welding the workpiece to be welded based on energization by pressing and holding a plurality of workpieces from both sides In
An end face processing means for cutting the tip end face of the tip based on relative rotation with the electrode tip, and processing the end face flat;
In order to constrict the tip portion of the electrode tip, side surface processing means for cutting the tip side surface of the tip based on relative rotation with the electrode tip and processing the side surface into a cone shape,
An electrode tip shaping device comprising: a switchable position through a change of position with respect to a predetermined processing position. The electrode tip shaping device according to claim 1, wherein the end surface processing means includes a square end mill which is an end mill for flat processing. The side surface processing means includes a cutter fixed in a cylindrical space for accommodating a tip portion of the electrode tip, and the electrode chip is accommodated in the cylindrical space, whereby relative rotation with the tip is performed. 3. The electrode tip shaping device according to claim 1, wherein at least a tip side surface of the tip housed in the cylindrical space is cut by the cutter based on movement. The said end surface processing means and the said side surface processing means are mounted | worn with one pedestal, and are further provided with the slide mechanism which slides this pedestal as a means which can switch these means. The electrode tip shaping apparatus according to Item. The electrode tip shaping device according to claim 4, wherein the slide mechanism is configured to slide the pedestal by changing a passive operation to a slide motion. The end surface processing means and the side surface processing means are both fixed with respect to the rotation direction of the relative rotation, and rotate to apply power to the electrode chip to cause the relative rotation to rotate. The electrode tip shaping device according to claim 1, further comprising a movement mechanism.

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