Header processing machine

Abstract

To provide a header processing machine that solves such the problem with contact failure that lubricant of a process machine scatters when causing a component to slide and the scattering lubricant adheres to an electrical contact part during manufacturing a rivet type electrical contact.SOLUTION: A header processing machine has a structure of not exposing a sliding surface of a component of a process machine to which lubricant adheres to the outside, thereby suppressing scattering of the lubricant when causing the component to slide. The header processing machine secures a sealed region with a plurality of oil seals which prevents the lubricant from scattering and performs molding processing in the region, thereby preventing the lubricant from adhering to an inter-metal junction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a header machine for manufacturing rivet-type electrical contacts. [Background technology]

[0002] There is a known technique for manufacturing rivet-type electrical contacts by cutting a metal wire and plastically deforming the cut pieces by cold rolling. The manufacturing device for this technique is generally called a header machine or a header processing machine.

[0003] The main process involves joining and forming dissimilar metals together using a punch that moves with two types of reciprocating linear motion and a die that receives the punch. The two types of reciprocating linear motion refer to the movement for switching punches from multiple punches relative to one die, and the movement due to the pressing action of the punch, and the directions of the respective motions are perpendicular to each other (Patent Document 1, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 4-143039 [Patent Document 2] Japanese Patent Application Publication No. 4-305329 Summary of the Invention [Problem to be solved by the invention]

[0005] The rivet-type electrical contacts manufactured by the header processing machine are mainly used as electrical contacts for relay parts in automobiles and general electrical appliances. Due to their nature, contact defects are not tolerated, and especially when supplied to automobiles, the supply of 100% good products is required, since contact defects can cause serious accidents.

[0006] However, in the conventional technology, the lubricating oil applied to the sliding portion of the punch holder, etc., is dispersed during sliding and adheres to the contact portion, resulting in a problem of contact failure.

[0007] For example, electrical contacts of connector parts manufactured by progressive press processing do not usually require joining of dissimilar metals, so foreign matter such as oil adhering to the electrical contacts can be removed by cleaning and air blowing processes, making this problem less likely to occur.

[0008] However, when joining dissimilar metals by header processing, the oil that gets into the joint and adheres between the metals cannot be removed by subsequent cleaning, and the structure of devices using conventional technology makes it impossible to add an oil seal or other sealing to prevent oil from splashing.

[0009] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a header processing machine having a structure for preventing the scattering of lubricating oil in order to solve the problem of poor contact caused by lubricating oil in rivet-type electrical contacts. [Means for solving the problem]

[0010] The present invention relates to a header processing machine for manufacturing rivet-type electrical contacts by cutting multiple metal wires with a wire cutter and joining and molding the cut pieces with a punch and a die, characterized in that it is equipped with a slide head that moves back and forth in a horizontal direction and the opposite direction, at least a part of its outer shape is cylindrical, the central axis of which coincides with the direction of the reciprocating linear motion, and which has a circular hole recess with one central axis on the circular surface of the die side of the cylindrical part and a round hole through hole in its bottom surface, and a punch holder that fits into the recess and through hole so as to be rotatably and slidably relative to the slide head, with the direction of the reciprocating linear motion being the rotation axis direction.

[0011] Here, "at least a portion of the outer shape is cylindrical" means that it includes cases where the outer shape is partially cylindrical, such as a piston for an internal combustion engine, which is composed of a cylindrical portion that contacts the inner surface of the cylinder and a non-cylindrical portion at the connecting rod, as well as cases where the outer shape can be recognized as cylindrical overall.

[0012] In the present invention, the central axis of the cylindrical portion of the slide head and the rotation axis of the punch holder coincide with each other.

[0013] In addition, the present invention is characterized in that the punch holder supports a plurality of punches, and forming is performed in a state in which the central axis of one of the punches coincides with the central axis of the cylindrical portion of the slide head.

[0014] The present invention is also characterized in that an oil seal is provided at an end of the recess.

[0015] The present invention is also characterized in that the slide head is guided by a plurality of guide shafts whose both ends are supported by the housing, the slide head has a plurality of through holes for the guide shafts which penetrate in the direction of the reciprocating linear motion at positions which are equally spaced and have equal central angles from the central axis of the cylindrical portion, and all of the ends of the plurality of through holes on the press direction side are provided with oil seals.

[0016] The present invention is also characterized in that the front of the housing is covered with an oil seal lid having a circular hole through which the cylindrical portion of the slide head can pass, the oil seal lid being provided with an oil seal at the inner end of the circular hole, and the housing supports a wire cutter unit for storing a wire cutter, the wire cutter unit having a through hole for inserting the wire cutter and provided with an oil seal at the inner end of the through hole. Effect of the Invention

[0017] According to the present invention, the sliding surfaces between the punch holder and the slide head are always covered from both sides. That is, the lubricating oil-applied surfaces are not exposed regardless of the state of rotational displacement of the punch holder. Therefore, it is possible to prevent the lubricating oil from scattering from the sliding surfaces.

[0018] According to the present invention, the rotation axis of the punch holder and the central axis of the slice head coincide with each other, so that the effects on product precision, such as part rattling and uneven wear caused by eccentric sliding, can be suppressed.

[0019] According to the present invention, the central axis of the pressing punch and the central axis of the slide head coincide with each other, so that deflection or breakage of the punch caused by eccentric pressing can be suppressed.

[0020] According to the present invention, an oil seal is provided at the end of the slide head on the pressing direction side of the sliding surface between the punch holder and the slide head, thereby making it possible to prevent leakage and splashing of lubricating oil from this sliding surface.

[0021] According to the present invention, the slide head is precisely guided by multiple guide shafts arranged symmetrically about the central axis of the slide head, so that no spacer is required for fine-tuning the positional misalignment of the punch relative to the die, and effects on product accuracy such as part wobble and uneven wear can be suppressed.

[0022] According to the present invention, all of the through holes of the slide head through which multiple guide shafts pass are provided with oil seals at the ends facing the press direction, thereby preventing leakage and splashing of lubricating oil from the sliding surfaces between the guide shafts and the slide head.

[0023] According to the present invention, the front part of the housing is covered with an oil seal lid equipped with an oil seal, so that splashing of lubricating oil from moving parts around the slide head, such as the connecting rod and crankshaft, can be prevented.

[0024] According to the present invention, since an oil seal is provided at the inner end of the wire cutter unit, it is possible to prevent the lubricating oil from scattering from the movable part of the wire cutter.

[0025] According to the present invention, dissimilar metals are joined and molded in an area sealed off from the lubricating oil formed inside the housing, thereby solving the problem of poor contact caused by adhesion of lubricating oil. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is a perspective view showing a main part of the present invention. [Diagram 2] FIG. 2 is a top view showing the present invention. [Figure 3-1] 3-1 to 3-8 are perspective views showing the processing steps. [Figure 3-2] 3-1 to 3-8 are perspective views showing the processing steps. [Figure 3-3] 3-1 to 3-8 are perspective views showing the processing steps. [Diagram 3-4] 3-1 to 3-8 are perspective views showing the processing steps. [Figure 3-5] 3-1 to 3-8 are perspective views showing the processing steps. [Diagram 3-6] 3-1 to 3-8 are perspective views showing the processing steps. [Diagram 3-7] 3-1 to 3-8 are perspective views showing the processing steps. [Diagram 3-8] 3-1 to 3-8 are perspective views showing the processing steps. [Figure 4] FIG. 4 is a perspective view showing the prior art. [Diagram 5] FIG. 5 is a cross-sectional view showing the present invention as viewed from above. [Figure 6-1] FIG. 6-1 is a simplified diagram showing a different embodiment. [Figure 6-2] FIG. 6-2 is a simplified diagram showing a different embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, a preferred embodiment of a header processing machine of the present invention will be described with reference to Figs.

[0028] The functions and positions of the main components of the present invention will be explained with reference to Figures 1 and 2. The upper side of Figure 1 shows the upper side of the header processing machine, and the lower side shows the lower side of the header processing machine. The direction connecting the preforming punch 15 and the forming die 17 is the horizontal direction, and the right side of the page is the front side of the header processing machine, and the left side of the page is the rear side of the header processing machine. Note that parts not necessary for explanation, such as the upper plate 90 in Figure 2, have been omitted from both drawings.

[0029] The housing 1 supports four guide shafts 6a, 6b, 6c, and 6d. The support method uses a conventional technique, such as press-fitting into holes provided in the housing beforehand. The housing 1 also supports a crankshaft 31 via a bearing (not shown). A connecting rod 32 is connected to the crankshaft 31 on one side and to the slide head 5 on the other side.

[0030] The method of connection is a conventional technique in which the rotational motion transmitted to the crankshaft 31 via the flywheel 30 is converted into reciprocating linear motion by the connecting rod 32 and transmitted to the slide head 5. The direction of the reciprocating linear motion is, of course, the horizontal direction connecting the punch and the die. The housing 1 is covered with an upper plate 90 on the top surface and an oil seal plate 80 on the front surface to prevent the splashing of lubricating oil from inside.

[0031] The slide head 5 has a cylindrical portion on its outer front side, which is in the same direction as the front side of the header processing machine, and its central axis direction coincides with the direction of the reciprocating linear motion. In other words, the outer front side of the slide head 5 is circular, and at least a part of the cylindrical side portion, the outer periphery of which is an end, comes into close contact with an oil seal, which will be described later, over the entire circumference.

[0032] The cylindrical portion of the sliding head 5 has through holes for the guide shafts 6a, 6b, 6c, and 6d. The guide shafts 6a, 6b, 6c, and 6d are used to guide the reciprocating linear motion of the sliding head 5, and therefore the penetrating direction of the through holes coincides with the direction of the reciprocating linear motion, i.e., the direction of the central axis of the cylindrical portion of the sliding head 5.

[0033] Guide shafts 6a, 6b, 6c, and 6d are of the conventional round bar type, and therefore the through holes are round. The four through holes are located at equal intervals from the central axis, and when the distance between the central axis and the through holes is considered as the radius, the central angles of the four through holes are uniformly 90 degrees when centered on the central axis. This is to prevent eccentricity in the relationship between the central axis and the guide shafts.

[0034] The cylindrical portion of the slide head 5 has through holes for the guide shafts 6a, 6b, 6c, and 6d, as well as a stepped circular through hole centered on the central axis. The stepped portion rotatably holds the punch holder 10. The punch holder 10 has a cylindrical shape, and its rotation axis coincides with the central axis of the slide head 5. This makes it possible to prevent rattling and wear caused by eccentricity.

[0035] The through holes for the guide shafts 6a, 6b, 6c, and 6d do not interfere with the stepped through holes, and when viewed from the front side of the slide head 5, the through holes for the guide shafts 6a, 6b, 6c, and 6d are located at equal intervals on the outside of the stepped round through holes.

[0036] In addition, the "stepped round hole through hole" refers to a round hole recess provided on the front exterior surface of the slide head 5 which shares a central axis, and a round hole through hole having a diameter smaller than the diameter of the recess provided at the bottom of the recess.

[0037] The punch holder 10 holds two position-adjusting sub-punch holders 11 in a so-called nested manner, and the two position-adjusting sub-punch holders 11 respectively hold a preforming punch 15 and a forming punch 16. The preforming punch 15 and the forming punch 16 are positioned point-symmetrically with respect to the rotation axis of the punch holder 10. In other words, when the punch holder 10 rotates 180 degrees, the positions of the preforming punch 15 and the forming punch 16 are swapped with each other.

[0038] The position-adjusting sub-punch holder 11 is used to finely adjust the position of the punch in relation to the forming die 17. The adjustment method is based on conventional technology, but with the present invention, positional deviations caused by eccentricity, part play, etc. are almost completely eliminated, making this a part that is used only "just in case."

[0039] 3-1 to 3-8, the machining process including the rotational operation of the punch holder 10 according to the present invention will be described. For convenience, the position adjusting sub punch holder 11 and the like are omitted.

[0040] 3-1 shows the material feed. The wire rods 2 and 3 pass through through holes provided in the center of each cutting die 41 and are fed by a predetermined pitch toward the punch holder 10.

[0041] Fig. 3-2 shows the process from the material cutting process to the cut piece conveying process. The wire rods 2 and 3 are cut into cut pieces by the wire rod cutter 40, and are conveyed to a position between the forming die 17 and the preforming punch 15, where the cut pieces are supported in an overlapping state (cut piece support parts are not shown).

[0042] Figures 3-3 and 3-4 show the preforming process. The cut pieces are preformed while overlapping each other and being pressed into the forming die 17 by the preforming punch 15. In Figure 3-4, the preforming punch 15 reaches the bottom dead center, whereby the cut pieces are joined together and the preforming is completed.

[0043] Figure 3-5 shows the switching of punches. The preforming punch 15 moves to the top dead center after the preforming is completed. The punch holder 10 rotates 180 degrees counterclockwise when viewed from the punch side to the die side, switching the positions of the preforming punch 15 and the forming punch 16.

[0044] Figure 3-6 shows the main forming process. The forming punch 16 moves toward the forming die 17 until it reaches the bottom dead center, at which point the main forming is completed.

[0045] FIG. 3-7 shows the switching of punches. The forming punch 16 moves to the top dead center after the main forming is completed. The punch holder 10 rotates 180 degrees counterclockwise when viewed from the punch side to the die side, switching the positions of the forming punch 16 and the preforming punch 15. Note that the rotation direction of the punch holder 10 is not limited to counterclockwise rotation, and the punch may be switched by reversing the rotation of the punch holder 10.

[0046] 3-8 is a diagram showing knocking out of the product. After the main molding is completed, the cut piece in the molding die 17 is ejected by an ejector pin or the like (not shown) as the product 100. After that, the process moves to the material feeding process again, and the above process is repeated.

[0047] Next, the conventional technology will be described with reference to FIG.

[0048] The slide head 5a has a substantially rectangular shape, and its outer side surface slides against the inner side surface X of the housing 1a, and moves back and forth in a horizontal direction. In other words, the inner side surface X of the housing 1a is a guide portion for the slide head 5a. Incidentally, the vertical movement of the slide head 5a is restricted by the slide head retainer 9a.

[0049] The punch holder 10a supports the preforming punch 15a and the forming punch 16a via the sub-punch holder 11a, and the punch holder 10a slides vertically and makes a reciprocating linear motion to switch between the punches arranged in a vertical row. The punch holder 10a is substantially prismatic, and both side faces Y and the rear face Z are sliding faces. The front face of the slide head 5a has a recess for slidably supporting the punch holder 10a.

[0050] As described above, the header processing machine of the prior art has a structure in which the surfaces on which the lubricant adheres are exposed during sliding, particularly on the inner side surface X of the housing 1a and the outer side surface Y and rear surface Z of the punch holder 10a, and therefore there is a problem with the scattering of the lubricant from the sliding parts. In addition, due to the structure, it was not possible to provide an oil seal.

[0051] 5 is a cross-sectional view showing the present invention as viewed from above. The present invention will now be described.

[0052] The punch holder 10 has an outer shape in which two cylinders of different diameters are connected together on the same central axis. The larger-diameter cylindrical portion of the punch holder 10 fits into a recess of a stepped round through-hole in the cylindrical portion of the slide head 5, and is supported rotatably and slidably on the bottom and side surfaces of the recess. The entire peripheral edge of the recess is cut out, and an oil seal 70 for the punch holder is attached thereto.

[0053] The smaller-diameter cylindrical portion of the punch holder 10 fits into a smaller-diameter through-hole having the same central axis as the recess of the slide head 5. Both peripheral ends of the smaller-diameter through-hole are cut out all around, and radial bearings 84 are attached to each of them to support the smaller-diameter cylindrical portion of the punch holder 10.

[0054] The end of the cylindrical portion of the punch holder 10 having a smaller diameter protrudes from the through hole of the slide head 5 in order to be connected to a servo motor 86 via a coupling 85. The method for connecting the end of the cylindrical portion to the coupling 85 and the servo motor 86 uses conventional technology.

[0055] The rear side of the cylindrical part of the slide head 5 constitutes a support part that supports the servo motor 86 and a connecting part that connects the connecting rod 32. The support part is made up of four support rods that extend horizontally rearward from the rear side circular surface that forms the cylindrical part of the slide head 5 and a roughly rectangular parallelepiped support base that is integrated with the four support rods. Each of the support rods is connected to the four corners of the support base.

[0056] The connecting portion is made up of two support pillars extending horizontally rearward from the two short side ends of the rear surface of the support base, and a shaft supported at both ends by the support pillars. Each support pillar has a shaft hole for supporting the shaft at both ends, and is connected to the connecting rod 32 via a shaft that fits into the support pillar.

[0057] The servo motor 86 is fixed to the support base and the slide head 5 and the connecting rod 32 are connected by conventional techniques.

[0058] From the above, the lubricating oil adhering to the rotating sliding portion of the punch holder 10 is not exposed during any rotational displacement, and scattering of the lubricating oil from this portion can be suppressed. Furthermore, since it is sealed by the punch holder oil seal 70, scattering of the lubricating oil from this portion can be completely suppressed.

[0059] The front surface of the housing 1 opens in a U shape when viewed from the front side of the header processing machine, and the opening is covered by an oil seal plate 80 having a through hole with a diameter sufficient to prevent interference with the slide head 5. The inner peripheral edge of the through hole in the oil seal plate 80 is cut out all around, and a slide head oil seal 71 is attached there to seal the gap with the side surface of the slide head 5.

[0060] The housing 1 supports a wire cutter unit on both sides thereof for storing the wire cutter 40. The wire cutter unit has a through hole for the wire cutter 40 to pass through, and the through hole is covered with a cover to which an oil seal 73 for the wire cutter, which has a structure similar to that of the oil seal plate 80, is attached. This prevents lubricating oil from scattering from the sliding parts of the wire cutter 40.

[0061] Further, the through holes for the guide shafts 6a, 6b, 6c, and 6d of the slide head 5 are each cut out entirely around the circumferential end on the front side of the header processing machine, and an oil seal 72 for the guide shaft is attached thereto.

[0062] Therefore, the area surrounded by the front surface of the slide head 5, the die molding surface, and the extended surfaces of the top and bottom surfaces of the housing is an area where the lubricating oil from the surrounding sliding parts is sealed off by the oil seal 71 for the slide head, the oil seal 72 for the guide shaft, and the oil seal 73 for the wire cutter, so that the lubricating oil can be completely attached between the joints of the cut pieces of the wire during molding.

[0063] Next, a different embodiment will be described with reference to Fig. 6-1 and Fig. 6-2. Fig. 6-1 is a simplified diagram when the rotation axis position of the punch holder is offset in the height direction from the central axis position (left side of the figure) of the cylindrical part of the sliding head 5. By aligning the central axis of the sliding head 5 with the central axis of one of the punches as shown on the right side of the figure, it is possible to prevent the punch from being damaged due to bending or buckling when a heavy load is applied.

[0064] Therefore, in this case, the center of the stepped round through hole of the slide head 5 is offset in the height direction from the central axis of the cylindrical portion of the slide head 5 by an amount that makes the central axis of the punch coincide with the central axis of the slide head 5. In addition, the rear side of the cylindrical portion of the slide head 5, such as the support base for the servo motor 86, is also offset in the same manner.

[0065] Figure 6-2 shows the arrangement of punches on the punch holder 10 when there are three or four punches, i.e., when there are three or four forming processes. By arranging the punches at a position where the central angle is 120° (left side of the figure) or 90° (right side of the figure) and controlling the rotation angle of the punch holder to the same angle, it is possible to handle three or four forming processes.

[0066] Although an embodiment of the header processing machine of the present invention has been described above, the present invention is not limited to the described embodiment, and various modifications can be made within the scope of the claims. [Explanation of symbols]

[0067] 1 unit 5 Slide Head 6a~6d guide shaft 10 punch holder 15 Preform punch 16 Molding punch 17 Molding Dies 40 Wire cutter 41 Cutting Dies

Claims

1. A header processing machine for manufacturing rivet-type electrical contacts by cutting a plurality of metal wires with a wire cutter and joining the cut pieces together with a punch and a die, a slide head which performs reciprocating linear motion in a horizontal direction and in the opposite direction, at least a part of its outer shape being cylindrical, the direction of its central axis coinciding with the direction of the approximately reciprocating linear motion, and which has a circular recess with a central axis on a circular surface of the approximately cylindrical part facing the die, and a circular through hole on its bottom surface; A punch holder that is engaged with the recess and the through hole so as to be rotatable and slidable with respect to the slide head, the direction of the approximately reciprocating linear motion being the rotation axis direction, A header processing machine comprising:

2. 2. The header processing machine according to claim 1, wherein a central axis of the cylindrical portion of the slide head coincides with a rotation axis of the punch holder.

3. 2. The header processing machine according to claim 1, wherein the punch holder supports a plurality of punches, and forming is performed in a state where a central axis of one of the punches coincides with a central axis of the cylindrical portion of the slide head.

4. 4. The header processing machine according to claim 2, further comprising an oil seal at an end of the recess.

5. The slide head is guided by a plurality of guide shafts whose both ends are supported by a housing, The slide head has a plurality of through holes for a guide shaft penetrating in the direction of the reciprocating linear motion at positions equally spaced and at equal central angles from the central axis of the cylindrical portion, 5. The header processing machine according to claim 4, wherein oil seals are provided at approximately all ends of the plurality of through holes in the press direction.

6. a front part of the housing is covered with an oil seal lid having a round hole through which the cylindrical part of the slide head can pass; The oil seal cover is provided with an oil seal at the inner end of the generally round hole, The housing supports a wire cutter unit for storing the wire cutter. The wire cutter unit has a through hole for inserting the wire cutter therethrough, An oil seal is provided at the inner end of the through hole.

6. A header processing machine according to claim 5.

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