JP4501780B2 - Resistance welding electrode - Google Patents

Description

  The present invention relates to a resistance welding electrode used for resistance welding in which a plurality of members are brought into contact with each other to supply current for welding.

  When welding a plurality of members made of metal, a portion to be welded of a plurality of members is placed between a pair of electrodes provided in a resistance welder, and the electrode is pressed against this contact portion. There is known a resistance welding method in which electric power is supplied and a contact portion is heated by electric resistance of metal to be welded.

  At this time, if the plurality of members are flat, for example, they can be easily pressed from above and below by a pair of electrodes in a state of being stacked on each other. On the other hand, when at least one of the plurality of members has a shape that is difficult to stably arrange, for example, when the members are pressed from above and below, there is a possibility that the contact portion of the members may be displaced. Therefore, in such a case, for example, one electrode (for example, a fixed electrode) has a divided structure, and at least one member is sandwiched (held) by the electrode, so that a plurality of members can be stably overlapped and pressed. Like to do.

  Therefore, as shown in FIGS. 5A and 5B, the inventor has a shape in which a part of a substantially circular cylinder is cut out between the upper and lower surfaces, and the remaining side surface slides with respect to other parts. A first member 201 having a non-sliding surface 201b as a non-sliding surface 201b, and a spherical second member 202 as a resistance welding electrode comprising a fixed electrode 110 and a movable electrode 120. 100 was used for resistance welding. At that time, in order to prevent the displacement of the welding position between the first member 201 and the second member 202, the first member 201 is held (held) by the fixed electrode 110 (111, 112), and the first member With the spherical second member 202 positioned in a recess (not shown) provided on the end surface of the member 201, the movable electrode 120 is moved downward (in the direction of the arrow), and the first member 201 and the second member 202 was welded in pressure contact. 5A and 5B are schematic views showing a conventional electrode structure, in which FIG. 5A is a side view and FIG. 5B is a plan view of the fixed electrode 110 viewed from above, both showing the relationship between the electrodes and members. Therefore, resistance welding is shown. Reference numeral 113 denotes a screw hole for fixing the fixed electrode 110 to the resistance welder. Each code corresponds to the embodiment of the present invention described below.

  However, as shown in FIG. 5B, the fixed electrodes 110 are semi-cylindrical fixed electrodes 111 and 112 obtained by dividing a cylinder having an inner peripheral surface corresponding to the sliding surface 201a. When the holding surfaces 111a and 112a that sandwich (hold) the sliding surface 201a of the first member 201 are formed, a spark is generated between the fixed electrode 110 and the first member 201, and the surface of the first member 201 has an appearance. It became clear that processing defects such as defects (burn marks) and surface roughness defects may occur.

  This is because a high current flows into the first member 201 at a time during resistance welding, so that the current that should flow from the contact portion between the fixed electrode 110 and the first member 201 is the side surfaces of the holding surfaces 111a and 112a and the first member 201. It is thought that this is because it flows through the gap 300 between them (that is, a spark is generated). In particular, in the configuration shown in FIG. 5, sparks fly at the corners of the boundary between the sliding surface 201a and the non-sliding surface 201b (contact end portions with the holding surfaces 111a and 112a), and the sliding surface 201a as a side surface Processing defects were found on the non-sliding surface 201b.

  An object of this invention is to provide the electrode for resistance welding which can reduce the processing defect by a spark in view of the said problem.

According to the first to third aspects of the present invention, as a plurality of members , a valve body that opens or closes an opening in a valve chamber of an electromagnetic valve, and a part of a substantially circular column are cut out between upper and lower surfaces, and non-sliding is performed. A pair of side surfaces of the cut-out portion that becomes the moving surface are provided facing each other, and a pair of remaining side surfaces that are the sliding surfaces for the other parts are provided facing each other, the non-sliding surface and the The present invention relates to an electrode for resistance welding which supplies a current and welds in a state in which a movable element which moves in conjunction with the valve body, in which a boundary with a sliding surface is a corner, is in contact.

The invention according to claim 1 includes a movable electrode and a fixed electrode having a holding surface for holding the mover , and the fixed electrode is divided into two so that each has a holding surface and is movable. child while holding by clamping, a gap between the two fixed electrodes, each holding surface, and one of the sliding surface over the entire surface of the opposite sides of the pair of sliding surfaces, sliding sliding surface wherein the corners of both ends, and a predetermined range of the non-sliding surface from the corner portion, in that it has a contact with the shape of.

According to the present invention, since the contact area (current path) between the holding surface and the member to be held is increased as compared with the prior art, it is possible to reduce processing defects due to sparks. In addition, as described above, in the sliding member, the surface roughness of the sliding surface is regarded as important. However, the entire sliding surface on the opposite side is held and the boundary with the sliding surface is maintained. Up to a predetermined range of the non-sliding surface including the corners is maintained . Therefore, it is possible to reduce at least processing defects occurring on the sliding surface.

According to a second aspect of the invention, the fixed electrode may be divided at a position shifted from the center position of the mover in the dividing direction, and one of the areas contacting the mover may be larger than the other.

If comprised in this way, the one fixed electrode which has a holding surface with a large contact area is fixed, and the member fixed by moving the other fixed electrode in the temporary holding state in which the mover is in contact with the fixed electrode. When nipping , the mover can be stably temporarily held on one fixed electrode .

According to a third aspect of the present invention, a screw hole for fixing to the resistance welder is provided, and the screw hole is preferably provided so as not to penetrate the contact surface with the mover .

If comprised in this way, the contact area (current path) of the holding surface of the electrode for resistance welding and a needle | mover can be enlarged more. Therefore, processing defects due to sparks can be further reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Moreover, each code | symbol is made to respond | correspond with FIG. 5 which shows the prior art example shown to the subject which invention will solve the code | symbol shown in the embodiment shown below.

(First embodiment)
1A and 1B are diagrams showing a schematic configuration of a resistance welding electrode in the present embodiment, in which FIG. 1A is a side view and FIG. 1B is a plan view of a fixed electrode viewed from above. In FIGS. 1A and 1B, the resistance welding is shown in order to show the relationship between the electrode and the member to be resistance-welded. FIG. 2 is a cross-sectional view for explaining a plurality of members to be resistance-welded.

  As shown in FIG. 1, the resistance welding electrode 100 according to the present embodiment includes a pair of fixed electrodes 110 and a movable electrode 120, and has resistance in a state where one of a plurality of members to be resistance-welded is held by the fixed electrode 110. It is configured to weld.

  In this embodiment, the 1st member 201 and the 2nd member 202 which are the structural members of the solenoid valve 200 shown in FIG. 2 are applied as a some member. The configuration and operation of the electromagnetic valve 200 are disclosed in Japanese Patent Application Laid-Open No. 2000-142353 previously filed by the present applicant, and thus detailed description thereof is omitted.

  The electromagnetic valve 200 shown in FIG. 2 is an electromagnetic valve for pressure increase control applied to brake control in general (for example, ABS, TRC, VSC), and is formed upstream from the lower side of the electromagnetic valve 200 toward the valve chamber 203. A side passage 204, a downstream passage 205 formed laterally from the valve chamber 203, a valve body as a second member 202 that opens and closes the opening 204a of the upstream passage 204, and a valve body (second In the direction in which the movable body (the shaft 201 and the plunger 207 as the first member 201) and the valve body (second member) 202 open the opening portion 204a. A return spring 208 that urges the shaft (first member) 201 and an electromagnet device 209 provided around the plunger 207 are provided. The electromagnet device 209 includes a solenoid 210, a guide 211 made of a magnetic material, and the like. In FIG. 2, the upper end surface of the shaft 201 and the lower end surface of the plunger 207 are not fixed, but may be configured to be fixed.

  As described above, the first member 201 is a columnar shaft that constitutes a part of the mover, is made of a nonmagnetic material, and is slidably disposed in the through hole of the guide 211 so as to be slidable in the vertical direction. It is a moving member. As shown in FIGS. 1A, 1B, and 2, the first member 201 has a shape formed by cutting out a part of a substantially circular cylinder between upper and lower surfaces, and the remaining side surface (curved surface). ) Is a sliding surface 201a with respect to the through-hole of the guide 211, and a side surface (planar portion) of the notched portion is a non-sliding surface 201b to form a fluid passage between the through-hole of the guide 211. In FIGS. 1A and 1B, a stepped portion that receives the return spring 208 and a recess in the lower end surface that positions and supports the valve element when resistance welding is performed are illustrated in a simplified manner.

  And the spherical valve body which is the 2nd member 202 is resistance-welded to the lower end surface of the 1st member 201 so that it may move up and down in conjunction with the 1st member 201 as a mover.

  Next, the resistance welding electrode 100 (particularly the fixed electrode 110), which is a feature of the present invention, will be described.

  As shown in FIGS. 1A and 1B, the fixed electrode 110 holds the side surfaces of the first member 201 as shown in FIGS. 1A and 1B. A cylinder having an inner peripheral surface corresponding to 201b) is composed of two fixed electrodes 111 and 112 obtained by dividing at a predetermined position. And each inner peripheral surface is made into the holding surfaces 111a and 112a which hold | grip (hold) the side surface of the 1st member 201. FIG. Therefore, in a state where the first member 201 is held between the two fixed electrodes 111 and 112, the entire holding surfaces 111 a and 112 a abut against the side surface of the first member 201 without a gap.

  As described above, the fixed electrode 110 according to the present embodiment is configured to sandwich the first member 201 in order to prevent the welding position of the first member 201 and the second member 202 from being shifted. In the state where the first and second members 201 are held, there is no gap between the side surfaces (sliding surface 201a and non-sliding surface 201b) of the first member 201 and the entire holding surfaces 111a and 112a. Further, the contact area (current path) between the holding surfaces 111a and 112a and the first member 201 to be held is increased compared to the conventional case. Therefore, processing defects due to sparks can be reduced.

  In particular, in the present embodiment, as the first member 201 held by the fixed electrode 110, a shaft of an electromagnetic valve that is a sliding member having a sliding surface 201a and a non-sliding surface 201b is applied. Thus, even if the sliding member places importance on the surface roughness of the sliding surface 201a, if the fixed electrode 110 described in the present embodiment is applied, the roughening of the sliding surface due to spark is reduced or prevented. can do.

  In the present embodiment, the fixed electrode 110 is divided into two fixed electrodes 111 and 112 by, for example, wire processing, and the two fixed electrodes 111 and 112 are divided while the first member 201 is held. The spacing is very small (0.4 mm width in this example). As a result, the contact area between the holding surfaces 111a and 112a and the first member 201 to be held is made as large as possible. Therefore, processing defects due to sparks can be further reduced.

  In the present embodiment, the division position of the two fixed electrodes 111 and 112 is set to a position shifted from the center position of the first member 201 in the division direction. Then, the fixed electrode 111 having a holding surface 111a having a large contact area with the first member 201 (in this example, holding a predetermined range of the non-sliding surface 210b connected to the entire surface of the opposing sliding surface 210a) is fixed. In this state, the first member 201 is brought into contact with the fixed electrode 111 (temporarily held), and then the fixed electrode 112 having a holding surface 112a having a small contact area with the first member 201 (in this example, facing the fixed electrode 112). The first member 201 is held by moving the entire sliding surface 210a. Therefore, even if the first member 201 has an unstable shape, it can be held. In addition, since the fixed electrode 111 having the holding surface 111a having a large contact area is temporarily held, the first member 201 can be stably temporarily held.

  Moreover, in this embodiment, it is set as the structure (structure screwed in from the resistance welding machine side) which provided the screw hole for fixing the fixed electrode 110 to a resistance welding machine so that it may not penetrate the holding surfaces 111a and 112a. That is, the contact area between the holding surfaces 111a and 112a and the first member 201 to be held is made as large as possible. Therefore, processing defects due to sparks can be further reduced.

  A recess (not shown) provided in the lower end surface of the first member 201 in a state where the first member 201 is sandwiched by the fixed electrode 110 (111, 112) configured in this manner with the lower end surface on the upper side. The spherical second member 202 is positioned and arranged. Then, by moving the movable electrode 120 downward (arrow direction) from above, the first member 201 and the second member 202 are pressed against each other and energized, whereby the first member 201 and the second member 202 are Can be welded. In the above configuration, when the inventor performed resistance welding with an applied current of 3 to 4 kA, a pressing force of several tens to several hundreds of N, and an energization time of several seconds, a processing defect due to spark that has been conventionally confirmed on the surface of the first member 201 (Poor appearance and reduced surface roughness) were not confirmed.

  In the present embodiment, the example in which the first member 201 is held by the fixed electrode 110 in the resistance welding electrode 100 is shown. However, the electrode to be held is not limited to the fixed electrode 110. What is necessary is just to have the structure which the electrode 100 for resistance welding hold | maintains the 1st member 201. When the resistance welding electrode 100 includes a pair of the fixed electrode 110 and the movable electrode 120 as in the present embodiment, at least one of the fixed electrode 110 and the movable electrode 120 is at least one of the first member 201 and the second member 202. As long as the configuration holds the However, if the structure is held by the fixed electrode 110, the movable electrode 120 may be energized while moving and moving in contact with the first member 201 and the second member 202. The configuration can be simplified compared to the configuration to be held.

  Moreover, in this embodiment, the fixed electrode 110 which hold | maintains the 1st member 201 consists of the two fixed electrodes 111 and 112 which were divided | segmented, The example which hold | maintains the 1st member 201 by pinching was shown. However, in addition to the holding, for example, as shown in FIG. 3, a groove 114 according to the outer shape of the first member 201 is provided, the first member 201 is inserted into the groove 114, and the inner wall surface is used as a holding surface. 110a may be configured to hold the first member 201. However, in the case of this configuration, the larger the contact area between the holding surface 110a and the first member 201, the more difficult it is to insert the first member 201 into the groove 114. Therefore, as shown in the present embodiment, it is preferable that the resistance welding electrode 110 is divided into a plurality to be sandwiched. Further, the number of divisions is not limited to two. It is good also as three or more. FIG. 3 is a plan view showing a modified example of the fixed electrode 110 and corresponds to FIG.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a plan view showing a schematic configuration of the fixed electrode 110 in the present embodiment. FIG. 4 corresponds to FIG. 1B shown in the first embodiment.

  Since the fixed electrode 110 in the second embodiment is often in common with that in the first embodiment, a detailed description of the common parts will be omitted, and different parts will be described mainly.

  As shown in FIG. 4, in this embodiment, the holding surfaces 111 a and 112 a of the fixed electrodes 110 (111 and 112) divided are configured so that the entire sliding surface 201 a and the non-sliding surface 201 b slide. The shape is in contact with at least a predetermined range from the boundary with the surface 201a.

  As described above, with the configuration shown in the present embodiment, the contact area (current path) between the holding surfaces 111a and 112a and the first member 201 is increased as compared with the conventional case, so that processing defects due to spark can be reduced. Can do.

  Further, the opposing surfaces 111b and 112b connected to the holding surfaces 111a and 112a are arranged in parallel with the non-sliding surface 201b of the first holding member 201, and between the opposing surfaces 111b and 112b and the non-sliding surface 201b. A gap 300 is formed. Therefore, a spark may be generated in the gap 300. However, since the holding surfaces 111a and 112a hold the entire surface of the sliding surface 201a and the predetermined range of the non-sliding surface 201b, the corner portion of the boundary between the sliding surface 201a and the non-sliding surface 201b that is likely to cause a spark. Thus, no spark is generated, and at least the processing defects occurring on the sliding surface 201a can be reliably reduced or prevented.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented with various modifications.

  The members to be resistance-welded are not limited to the first member 201 and the second member 202. Three or more may be sufficient. Further, the first member 201 that is a held member is not limited to a sliding member. Furthermore, the shape of the member to be held is not limited to the shape shown in the present embodiment.

  The resistance welding electrode 100 is not limited to the pair of fixed electrode 110 and movable electrode 120. The electrode holding at least one of the plurality of members may have the configuration shown in the present embodiment.

It is the schematic which shows the electrode structure in 1st Embodiment, (a) is a side view, (b) is a top view of the fixed electrode seen from upper direction. It is sectional drawing which shows the structure of a 1st member and a 2nd member. It is a top view which shows the modification of a fixed electrode. It is a top view which shows schematic shape of the fixed electrode in 2nd Embodiment. It is the schematic which shows the conventional electrode structure, (a) is a side view, (b) is a top view of the fixed electrode seen from upper direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Resistance welding electrode 110, 111, 112 ... Fixed electrode 110a, 111a, 112 ... Holding surface 113 ... Screw hole 120 ... Movable electrode 201 ... 1st member 201a. ..Sliding surface 201b ... Non-sliding surface 202 ... Second member 300 ... Gap

Claims (3)

A valve body for opening or closing the opening in the valve chamber of the solenoid valve;
A part of the substantially circular cylinder is notched between the upper and lower surfaces, and a pair of side surfaces of the notched portion which becomes the non-sliding surface are provided to face each other and remain as a sliding surface for other parts. A pair of side surfaces provided opposite to each other, the boundary between the non-sliding surface and the sliding surface being a corner, and a stroke that moves in conjunction with the valve body,
An electrode for resistance welding that welds by supplying a current in a state of contact,
A movable electrode and a fixed electrode having a holding surface for holding the mover ;
The fixed electrode is divided into two so that each has the holding surface, and in a state where the movable element is held by sandwiching, there is a gap between the two fixed electrodes,
Each holding surface is made up of the entire sliding surface on one side of the pair of sliding surfaces facing each other, the corners at both ends of the sliding surface, and a predetermined portion of the non-sliding surface from the corners. An electrode for resistance welding characterized by having a shape abutting on the range . The division position of the fixed electrode is set to a position shifted from the center position of the movable element held in the division direction, and one of the areas in contact with the held movable element is larger than the other. The electrode for resistance welding according to claim 1 . Has a screw hole for fixing to the resistance welder,
The resistance welding electrode according to claim 1 or 2 , wherein the screw hole is provided so as not to penetrate a contact surface with the movable element to be held.

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