JP4612437B2 - Processing method for soft long workpieces - Google Patents

Description

  The present invention relates to a method for processing a soft long workpiece.

  When performing continuous machining on a line for long workpieces made of rubber, resin, etc. that are soft and stretchable, such as automotive weather strips, use a rotary encoder. It is used as a medium for dimensional measurement, and the amount of workpiece movement is confirmed directly or indirectly and dimensioning is performed.

  When measuring the amount of workpiece movement directly or indirectly using a rotary encoder, if the workpiece is made of a soft material, there will be dimensional variations in the position where machining is performed due to the expansion and contraction of the workpiece. There is a problem that it is difficult to perform stable machining within a predetermined dimensional tolerance.

For example, in Patent Document 1, a thread made of an olefin-based polypropylene or polyethylene fiber is embedded in a workpiece extruded with EPDM rubber, and a tensile stress acts on the workpiece in the longitudinal direction. Is disclosed in which the elongation of the workpiece is constrained by the above-described yarn even in a state in which the workpiece is stretched.
JP 2000-264072 A

  However, in such Patent Document 1, as a result, the rigidity of the work body is improved by the thread embedded in the work, so that the work is finally attached to the curved mounting portion, such as a weather strip. In the case of mounting by bending, it becomes difficult for the workpiece to follow the bending of the mounting portion, and there is a possibility that the original function of the workpiece such as the sealing performance may not be sufficiently exhibited.

  It is also possible to attach a tape-like member made of a material that is difficult to stretch compared to the workpiece to the workpiece surface to constrain the elongation of the workpiece, but when attaching a tape-like member to the workpiece Since the tape-shaped member is pressed against the work, there is a possibility that the work is stretched when the tape-shaped member is attached.

According to a first aspect of the present invention, there is provided a processing method for a soft long workpiece, a workpiece extruding step for extruding a soft and long workpiece, and a workpiece being sent to a processing position where machining is performed by a workpiece feeding means. A workpiece machining step, and a workpiece machining step for machining the workpiece at the machining position, and measuring the workpiece feed amount from the workpiece feeding means by a rotary encoder upstream of the machining position. , A predetermined amount of work is sent to the above processing position, and the work is machined at predetermined intervals with respect to the work. extruded into a predetermined position of the workpiece surface at the upstream side, the resin extrudate are joined continuously along the workpiece longitudinal direction, the resin extruded body that is joined to the workpiece surface After the work processing steps, ultimately, it is peeled off from the workpiece, and characterized in that it is removed from the workpiece. As a result, the expansion and contraction of the workpiece is constrained by the resin extruded body between the machining positions where the workpiece is machined from the workpiece feeding means, and the workpiece feed amount from the workpiece feeding means is measured by the rotary encoder. Thus, the feed amount to the machining position of the workpiece is accurately detected. In other words, the workpiece feed amount from the workpiece feeding means to the machining position and the actual workpiece length between the machining position and the workpiece feeding means substantially coincide with each other. Further, since the resin extruded body is bonded to the surface of the workpiece, it is possible to remove the resin material on the surface of the workpiece after machining without impairing the shape and intended characteristics of the workpiece, if necessary.

Invention of Claim 2 is a processing method of the soft elongate workpiece of Claim 1 , The resin extrusion body joined to the workpiece | work surface exhibits a cross-sectional substantially circular shape, and it exists in a workpiece | work longitudinal direction with respect to a workpiece | work. It is characterized by being joined in a substantially line contact state.

The invention described in claim 3 is characterized in that, in the soft long workpiece processing method described in claim 1 or 2 , the resin extruded body bonded to the workpiece surface is an olefin resin.

  According to the present invention, an accurate workpiece feed amount can be detected by using a relatively inexpensive rotary encoder without using a visual or expensive image processing apparatus or the like. Processing can be performed.

  Moreover, it is also possible to remove the resin material on the workpiece surface after machining, if necessary, and complete recycling of the workpiece and the resin extruded body can be realized.

  An embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory view schematically showing a schematic configuration of an extrusion molding apparatus 10 for extruding a soft long work, and FIG. 2 is a processing apparatus 20 for performing machining on the soft long work at predetermined intervals. FIG. 3 is a plan view showing a schematic configuration of a processing apparatus 20 that performs machining on a soft long workpiece at predetermined intervals.

  An extrusion molding apparatus 10 shown in FIG. 1 manufactures a soft and long automobile weather strip (hereinafter referred to as a workpiece w) mainly made of a rubber material such as EPDM. The workpiece w extruded so as to have a cross-sectional shape is vulcanized in the vulcanizing tank 12 and taken up by the first take-up machine 13 in a state in which the shape is sufficiently stabilized. A resin extruder 14 (details will be described later) is arranged on the downstream side of the first take-up machine 13, and a resin extruded body m (described later) extruded from the resin extruder 14 is joined to the workpiece w. Later, a surface treatment agent is applied at the painting booth 15. The workpiece w coated with the surface treatment agent is dried by the drying furnace 16 disposed on the downstream side of the coating booth 15, and is wound up via the second take-up machine 17. ing. The wound workpiece w is sent to the processing apparatus 20 (details will be described later). Here, the process of extruding the workpiece w from the rubber extruder 11 corresponds to the workpiece extrusion molding process.

  The material of the workpiece w is not limited to a rubber material, and may be a thermoplastic elastomer or a resin material. However, for example, when a relatively hard material such as a resin material is used, the inside of the work w is foamed in a sponge shape so that the work w is soft. Further, when the material of the workpiece w is a thermoplastic elastomer or resin, a cooling tank is disposed on the downstream side of the rubber extruder 11 instead of the vulcanizing tank 12.

  4 and 5 are explanatory views schematically showing the schematic configuration of the resin extruder 14 described above.

  The resin extruder 14 extrudes a resin extruded body m, which is relatively less stretchable than the workpiece w, onto the surface of the workpiece w and joins it to the workpiece w. As shown in FIG. The cylinder 41 in which the olefin-based resin material is stored, and the die 42 to which the resin material in the cylinder 41 is supplied and extrude the resin extruded body m made of the resin material to the workpiece w are roughly constituted. . As shown in FIG. 5, the die 42 is configured to extrude a resin extruded body m from above the workpiece w against the workpiece w on the extrusion molding apparatus 10 line. The resin extruded body m extruded from the die 42 onto the surface of the workpiece w is joined to the surface of the workpiece w by its own heat so as not to cause elongation of the workpiece w. In addition, the olefin resin material used as the resin extrusion m is specifically polyethylene (PE) or polypropylene (PP). In addition, the thickness of the resin extruded body m is set to a thickness that does not alienate the flexibility (flexibility) of the workpiece w with respect to the cross section of the workpiece w.

  The resin extruded body m extruded from the die 42 is continuously joined to a predetermined position on the surface of the work w in the work longitudinal direction. 4 and 5 is a shape guide that matches the shape of the workpiece w extruded by the rubber extruder 11, and the resin material is extruded from the die 42 onto the workpiece w on the shape guide 43. The resin extruded body m is bonded to a predetermined position of the workpiece w.

  The processing apparatus 20 shown in FIGS. 2 and 3 is used for assembling a clip 51 for mounting a vehicle body (see FIGS. 6 and 7 to be described later) on a work w that is a weather strip for an automobile.

  The processing apparatus 20 includes a punching machine 21 that drills holes at predetermined positions at a predetermined position on the work w, and a clip insertion machine 22 that pours the base 51a of the clip 51 into a hole formed on the work w by the punching machine 21. The cutter 23 for cutting the workpiece w into a predetermined length and workpiece feeding belts 24 and 24 as workpiece feeding means located on the upstream side of the boring machine 21 are incorporated.

  Here, 25 is an inlet guide for the workpiece w, 26 is a driving roller that is rotationally driven by a motor (not shown), 27 is a roller that sandwiches the workpiece w in pairs with the driving roller 26, and 28 is a setting position of the workpiece w. A guide roller 29 that is positioned substantially vertically above and guides the workpiece w to the drive roller 26, and 29 is a support roller that is positioned between the drive roller 26 and the workpiece feed belt 24.

  The drive roller 26 is controlled to be driven when the slack amount of the workpiece w located between the support roller 29 and the drive roller 26 reaches a predetermined minimum value, and to stop when the slack amount increases to a predetermined maximum value. . That is, photoelectric switches (not shown) composed of a projector and a light receiver are arranged at two places, the upper limit position and the lower limit position of the slack bottom end Q of the work w, and the light projector and the light receiver are opposed to each other in the direction perpendicular to the paper of FIG. And the rotation of the motor that rotates the drive roller 26 is controlled on and off by a signal obtained by the slack bottom end position Q blocking the light from the projector.

  The workpiece feed belts 24 and 24 sandwich the workpiece w opposite to each other, and one is driven by a belt driving motor 31 whose rotation is controlled by the controller 30. That is, a unit composed of the work feeding belts 24, 24, the belt driving motor 31 and the controller 30 corresponds to the work feeding means. The work feed belts 24 and 24 are provided with a rotary encoder 32 that outputs the feed amount to the controller 30 as a work feed signal. More specifically, a roller 32 a is attached to the shaft of the rotary encoder 32, the roller 32 a comes into contact with the work feed belt 24, and the roller 32 a rotates as the work feed belt 24 comes into contact with the work w.

  When the controller 30 receives the workpiece feed amount signal from the rotary encoder 32 and detects that the workpiece w has been fed by a predetermined amount based on this signal, the controller 30 stops the rotation of the workpiece feed belts 24, 24, and Drilling is performed on the workpiece w by the drilling machine 21 located in the position.

  The perforating machine 21 has a perforating tool 21a in which a cone-shaped cutting edge moves up and down. Work feed belts 24 and 24 and work feed auxiliary rollers 34 and 34 are arranged in front and rear, and is located upstream of the perforating tool 21a. The controller 30 controls the feed amount of the work w by the feeding belts 24 and 24 and the lifting / lowering operation (drilling operation) of the drilling tool 21a.

  The clip insertion machine 22 is disposed adjacent to the drilling machine 21 and moves to the hole position instead of the drilling machine 21 immediately after drilling under the control of the controller 30, where the base of the clip 51 is placed in the hole. 51a is poured in. During the operation of the punching machine 21 and the clip insertion machine 22, the work feed belts 24, 24 are not rotating.

  The cutter 23 is arranged adjacent to the downstream side of the auxiliary rollers 34, 34, and when the controller 30 detects that the workpiece w has been fed by a predetermined amount based on the workpiece feed amount signal of the rotary encoder 32, the controller The workpiece w is cut by 30 commands.

  Further, in the section between the cutter 23 and the auxiliary rollers 34, 34, the resin extruded body m bonded to the surface of the workpiece w is removed by the resin extruded body removing machine 35.

  And the workpiece | work w cut | disconnected by the cutter 23 by predetermined length is paid out by the conveyance conveyor 36. FIG.

  In addition, in the processing apparatus 20 shown in FIG.2 and FIG.3, the process of sending the workpiece | work w to the position which drills with the drilling machine 21, and the process of sending the workpiece | work w to the position which cut | disconnects with the cutter 23 are carried out. This corresponds to the workpiece processing feed process. Moreover, the process of perforating the work w by the perforator 21 on the processing table 33 and the process of cutting the work w by the cutter 23 correspond to the work processing process.

  When the feed amount of a soft long workpiece such as a weatherstrip is detected by a rotary encoder and machined continuously on the line at a predetermined position of the workpiece, as described above, it is caused by the expansion and contraction of the workpiece. The feed amount of the workpiece cannot be detected accurately, and it is difficult to perform stable machining within a predetermined dimensional tolerance.

  However, in the present embodiment, since the resin extruded body m that restrains the expansion and contraction of the workpiece w is joined to the extruded workpiece w, the workpiece feed belt 24 measured by the rotary encoder 32 is transferred to the work table 33. The workpiece feed amount substantially coincides with the actual length of the workpiece w between the work table 33 and the workpiece feed belt 24. That is, by measuring the workpiece feed amount from the workpiece feed belt 24 with the rotary encoder 32, the feed amount of the workpiece w to the machining position is accurately detected. Therefore, it is possible to accurately perform the drilling process performed on the workpiece w on the processing table 33 at a predetermined position in the workpiece longitudinal direction.

  In addition, regarding the cutting of the workpiece w by the cutter 23, since the resin extruded body m that restrains the expansion and contraction of the workpiece w is joined until just before the workpiece w cutting position by the cutter 23, the workpiece feeding belt measured by the rotary encoder 32 is joined. The workpiece feed amount from 24 to the workpiece cutting position by the cutter 23 and the actual length of the workpiece w between the workpiece cutting position by the cutter 23 and the workpiece feeding belt 24 substantially coincide with each other. Therefore, the workpiece w can be accurately cut into a predetermined length by the cutter 23.

  And since the resin extrusion m is removed from the workpiece | work w, all the machining processes are complete | finished and the workpiece | work w which became the product state has the original characteristic (stretchability and flexibility) of the workpiece | work w. Thus, it can be attached to a work attachment portion (not shown) such as a vehicle body opening including a curved portion with good followability.

  Further, by removing the resin extrudate m from the work w, the work w and the resin extrudate m can be completely recycled.

  FIGS. 6 and 7 show specific bonding shapes of the resin extruded body m to the workpiece w.

  The work w shown in FIGS. 6 and 7 is a weather strip, a mounting base 52 fixed by a clip 51 to a vehicle body opening (not shown), a first hollow portion 53 and a second hollow portion 54 having a hollow cross section. It is roughly composed of A resin extruded body m having a rectangular cross section is joined to the outer surface of the mounting base 52. When the resin extruded body m having a rectangular cross section is bonded to the workpiece w as described above, the resin extruded body m is heated and the resin extruded body m is scraped from the mounting base 52 using a tool such as a scraper. To remove. That is, the resin extruded body removing machine 35 in this case is configured to have means for heating the resin extruded body m and means for scavenging the heated and softened resin extruded body m from the surface of the workpiece w.

FIG. 8 is another example showing a specific joining shape of the resin extruded body m to the workpiece w, and the workpiece w shown in FIG. 8 has substantially the same shape as the workpiece w shown in FIG.

  In FIG. 8, the resin extruded body m joined to the outer surface of the attachment base 52 has a circular cross section, and is joined in a state of substantially line contact with the workpiece w along the workpiece longitudinal direction. As described above, when the resin extruded body m has a circular cross section and is joined in a state of being substantially in line contact with the workpiece w, the joining area of the resin extruded body m to the workpiece w is small, and the resin extruded body m is heated. It is possible to simply peel it off from the workpiece w. That is, the resin extruded body removing machine 35 in this case does not require a means for heating the resin extruded body m, and is configured to have only a means for continuously peeling the resin extruded body m from the workpiece w.

The work w (weather strip) shown in FIGS. 6 to 8 has a structure in which the resin extruded body m is bonded to the mounting base 52, but the resin extruded body m is bonded to a place other than the mounting base 52. It is also possible to do.

  Further, the resin extruded body m may be removed from the work w after the regular cutting by the cutter 23.

Explanatory drawing which showed typically schematic structure of the extrusion molding apparatus which extrudes the soft elongate workpiece | work which concerns on this invention. The side view which shows schematic structure of the processing apparatus which performs machining with respect to the soft elongate workpiece which concerns on this invention for every predetermined space | interval. The top view which shows schematic structure of the processing apparatus which performs machining with respect to the soft elongate workpiece which concerns on this invention for every predetermined space | interval. It is explanatory drawing which showed typically schematic structure of the resin extruder. It is explanatory drawing which showed typically schematic structure of the resin extruder. The principal part sectional drawing which showed the concrete joining shape to the workpiece | work w of the resin extrusion body m. The principal part explanatory drawing which showed the specific joining shape to the workpiece | work w of the resin extrusion body m. The principal part sectional drawing which showed the concrete joining shape to the workpiece | work w of the resin extrusion body m.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Extrusion molding apparatus 14 ... Resin extruder 20 ... Processing apparatus 32 ... Rotary encoder w ... Work m ... Resin extrusion body

Claims (3)

A workpiece extrusion process for extruding a soft and long workpiece, a workpiece processing feed step for feeding the workpiece to a processing position where machining is performed by the workpiece feeding means, and a workpiece for machining the workpiece at the above processing position And measuring a workpiece feed amount from the workpiece feeding means by a rotary encoder upstream of the machining position, and feeding a predetermined amount of the workpiece to the machining position, with a predetermined interval from the workpiece. In the processing method of soft long workpieces that are machined every time,
Extruded resin extruded body, which is relatively less stretchable than the workpiece, at a predetermined position on the workpiece surface upstream of the workpiece processing feed step, this resin extruded body is continuously joined along the workpiece longitudinal direction ,
A method for processing a soft long workpiece, wherein a resin extruded body bonded to a workpiece surface is finally peeled off from the workpiece and removed from the workpiece after the workpiece machining step . The soft resin product according to claim 1 , wherein the resin extruded body joined to the work surface has a substantially circular cross section and is joined in a substantially line contact with the work along the longitudinal direction of the work. Processing method for long workpieces. The method for processing a soft long workpiece according to claim 1 or 2 , wherein the extruded resin bonded to the workpiece surface is an olefin resin.

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