JP4164813B2 - Manufacturing method of long molded products - Google Patents

Description

  The present invention relates to the production of a long molded product formed by extrusion molding of a weather strip for an automobile used for sealing between a door body such as an automobile door or a trunk lid and an opening of a vehicle body. Is the method. More specifically, the present invention relates to a method for producing a long molded product having a metal insert inside a weather strip or the like.

  Long molded articles such as weather strips for automobiles are formed by extrusion molding with embedded inserts. In this case, after using a soft material such as synthetic rubber or thermoplastic elastomer to cover the insert by extrusion molding, in the case of synthetic rubber, it is vulcanized in a vulcanizing tank to form a continuous long molded product. Is done. Then, after filling the sealant inside the trim portion having a substantially U-shaped cross section of the weather strip and cutting it to a predetermined size, a portion corresponding to the corner portion of the vehicle body is formed by molding, and the automobile wafer is formed. It becomes a product such as the strip (for example, see Patent Document 1).

  In the production of the weather strip which is a long molded product, as shown in FIG. 2, first, a continuous long molded product is continuously formed by extrusion molding. That is, a long strip-shaped metal plate is punched by an insert punching machine (not shown) to form a ladder-shaped insert 154 in which strip-shaped metal plates are connected by a connecting portion. This insert 154 is sent to the extrusion molding machine 1, and the insert 154 is coated with synthetic rubber, thermoplastic elastomer, or the like to form a trim portion or a hollow seal portion, and the weather strip 100 is formed. Then, it transfers to the vulcanization tank 2, and heats and vulcanizes with a hot air or UHF.

  After the vulcanized and continuously formed long molded product is taken up by the take-up machine 3, the insert separating unit 110 separates the connecting portion of the insert 154 in order to improve the flexibility of the long molded product. The The insert separator 110 will be described later. The long molded product from which the insert 154 is separated is transferred to the bending roll machine 20, and the trim portion 52 is bent into a substantially U-shaped cross section by the bending roller 21, as shown in FIG. The long molded product that is bent is cut into a predetermined dimension for each product number. Each of the long molded products cut to a predetermined size is subjected to processing such as molding of the terminal portion according to the product specifications. At this time, in order to make the dimensions of the product to be cut accurate, and to clarify the tip of the product after cutting the continuous long molded product, to facilitate the processing work performed before cutting, long molding In some cases, a notch is provided in an insert embedded in a product.

FIG. 3 shows the shape of the insert 154 formed by punching a strip-shaped metal plate to form a ladder shape or a fish bone shape. The insert 154 has a fish-like shape in which a central portion of strip portions 154c arranged in the width direction in a strip shape is connected by a connecting portion 154d or a ladder shape in which both ends of the strip portion 154c are connected.
As shown in FIG. 6, the conventional apparatus of the insert separator 110 that separates the insert 154 of the continuous long molded product is configured to zigzag a large number of rollers 111 and 115 that are rotatable and the rotation shaft does not move. The long molded product is passed in a zigzag manner. Then, by taking the long molded product with the take-off roller 117, the long molded product is bent many times to separate the connecting portion 154d of the insert 154 (see, for example, Patent Document 2).

For this reason, when a long molded product is first attached to the insert separator 117, the long molded product is folded in a zigzag manner one by one while bending the long molded product. It was.
In recent years, with the diversification of products, it is necessary to manufacture various types of products, and the number of times that a long molded product having various types of specifications is mounted on the insert separator 110 is increasing. Therefore, it takes time to mount the long molded product on the insert separator 110 every time the specification changes.
JP-A-6-106597 (page 3-5, FIG. 4) JP 59-188421 (2nd page, FIG. 4)

  Therefore, in order to efficiently produce many long molded products with different specifications, the long molded products can be quickly and easily mounted on the insert separator to improve the production efficiency of various types of long molded products. Was desired.

In order to solve the above-mentioned problem, the present invention of claim 1 has an insert in which a metal strip portion is connected by a connecting portion, and a long molded product in which a soft material is coated on the insert by an extruder. In the manufacturing method of a long molded product that separates the connecting portion of the insert with an insert separator,
The insert separator has a plurality of moving rollers and fixed rollers arranged in a row, and before the long molded product for separating the inserts is mounted, the moving roller row is positioned on one side with respect to the fixed roller row. , A gap is provided between the moving roller row and the fixed roller row, and after inserting the long molded product into the gap between the moving roller row and the fixed roller row, each moving roller is inserted into the fixed roller row. Move between each fixed roller so as to be on the other side of the fixed roller row, fold the long molded product in a zigzag shape with each of the above fixed rollers and each moving roller, and rotate the folded long molded product A long molded product characterized in that the connecting portion of the insert is separated by pulling at the pulling portion so as to pass between the fixed roller and the moving roller. It is a production method.

In the first aspect of the present invention, the insert separator has a plurality of moving rollers and a fixed roller arranged in a row, and the moving roller row becomes a fixed roller row before the long molded product for separating the insert is mounted. As it is located on one side and a gap is provided between the moving roller row and the fixed roller row, the space between the moving roller row and the fixed roller row is opened linearly, and a long molded product is inserted. When the separator is mounted, the long molded product can be mounted simply by fitting the linear long molded product into the gap as it is.
Lined up in a single line means, for example, that the rollers are lined up in the horizontal or vertical direction.If the rollers are lined up in the horizontal direction, long molded products can be mounted in a straight line horizontally. When arranged in the direction, the long molded product can be similarly mounted in a straight line in the vertical direction.

After inserting the long molded product between the moving roller row and the fixed roller row, each moving roller passes through the fixed roller row so that it is on the other side of the fixed roller row. Therefore, by moving each moving roller to the other side, each moving roller and each fixed roller can be bent in a zigzag shape while pressing the long molded product with each moving roller.
Since each moving roller is moved, the long molded product is not cut and can be smoothly bent.

  The insert is removed by bending the long molded product in a zigzag shape with each fixed roller and each moving roller, and pulling the folded long molded product at the take-up part so that it passes between the rotating fixed roller and the moving roller. In order to separate the long molded product from the take-up part, the long molded product is bent many times between a number of fixed rollers and moving rollers, and the connecting part of the embedded insert is cut. Thus, a long molded product having flexibility and synthesis can be manufactured.

  The present invention according to claim 2 is a method for producing a long molded product in which the movement of the moving roller train is performed by simultaneously moving several moving rollers in a set.

  According to the second aspect of the present invention, in order to move the moving roller train in a set of several at a time, a moving roller unit for moving the moving roller is provided, and the moving roller is moved by moving the unit. Can be moved simultaneously as a set, and it is easier than moving the moving devices of the moving rollers one by one. Even if several units are moved at the same time by the unit, it is only a few, so compared to moving all the moving rollers at once, abnormal tension is applied to the long molded product while moving by rotating the moving rollers. There is no breakage.

  According to the third aspect of the present invention, the moving roller is attached so as to be freely rotatable, and the fixed roller is attached to the insert separator with respect to the fixed rollers provided at least on the inlet side and the outlet side of the insert separator. This is a method for producing a long molded product that is rotated by a motor and passes the long molded product in a zigzag manner between each fixed roller and each moving roller.

In the third aspect of the present invention, the moving roller is attached to be freely rotatable, and the fixed roller is attached to the insert separator with respect to the fixed rollers provided at least on the inlet side and the outlet side of the insert separator. Since it is rotated by a motor, it is possible to transfer a long molded product by rotating fixed rollers provided at least on the inlet side and the outlet side of the insert separator. In order to transmit the rotation of the motor to the fixed roller, the rotation transmission mechanism becomes simpler than rotating the moving roller with the motor. Since the moving roller rotates freely as the long molded product is transferred, it does not resist the transfer of the long molded product, and a fixed roller is provided separately from the moving roller, so it moves to the long molded product. The force to be transmitted can be transmitted over the entire length, and the long molded product can be reliably transferred.
By passing the long molded product in a zigzag manner between each fixed roller and each moving roller and transferring it, the long molded product can be bent many times by the rotation of each fixed roller and each moving roller, The connecting portion of the embedded insert can be separated.

  The present invention of claim 4 is a method for producing a long molded product in which the diameter of the fixed roller gradually increases with the moving direction of the long molded product.

  In the present invention of claim 4, since the diameter of the fixed roller gradually increases as the long molded product moves, even if the rotation of the fixed roller is rotated at the same number of rotations, the rotation distance of the outer periphery of the fixed roller is The length gradually increases, and the tensile force applied to the long molded product can be gradually increased as the long molded product moves, and the separation of the insert embedded in the long molded product can be promoted.

  The present invention of claim 5 is a method for producing a long molded product, wherein the moving distance of the moving roller train to the fixed roller train becomes longer according to the thickness when the thickness of the long molded product becomes thicker.

  In this invention of Claim 5, the moving distance with respect to the fixed roller row | line | column of a moving roller row | line | column covers the insert of a long shape molded product by becoming long according to thickness when the thickness of a long molded product becomes thick. Even if the layer of rubber or soft synthetic resin becomes thicker, the distance between the moving roller row and the fixed roller row can be increased, and the long molded product is long around the outer circumference of each moving roller and each fixed roller. In addition, it can bend more reliably along the outer periphery of the roller, and the connecting portion of the insert can be reliably separated.

  The present invention of claim 6 is a method for producing a long molded product, wherein the insert separator is provided with an impact absorbing device for relaxing the tensile force of the long molded product at an entrance for taking in the long molded product.

  According to the sixth aspect of the present invention, the insert separator is provided with an impact absorbing device for relaxing the tensile force of the long molded product at the entrance for taking in the long molded product. When gradually lowering, the impact on the long molded product is absorbed, and even during the separation of the insert of the long molded product, the transfer speed of the long molded product in the insert separator and the extruder and the vulcanizing tank varies. Even when this occurs, it is possible to absorb impacts and changes in tension applied to the long molded product.

  The present invention of claim 7 is a method for producing a long molded product, wherein the long molded product is a weather strip that seals the periphery of the opening of an automobile.

  In the present invention of claim 7, since the long molded product is a weather strip that seals the periphery of the opening of the automobile, the metal insert embedded in the trim portion of the weather strip can be separated. The weather strip can be attached to the curved portion of the door or opening of the automobile along the curved portion. In addition, the gripping force of the trim portion can be increased by the metal insert embedded in the trim portion, and the trim portion can firmly grip the door of the automobile and the flange of the opening.

In the present invention, before the insert separator is mounted with the long molded product for separating the insert, the space between the moving roller row and the fixed roller row is opened linearly, and the long molded product is mounted on the insert separator. In this case, the long molded product can be mounted by simply inserting the linear long molded product into the gap as it is.
Also, after inserting the long molded product between the moving roller row and the fixed roller row, each moving roller passes between the respective fixed rollers to move to the other side with respect to the fixed roller row, By moving the moving roller row downward, it can be bent and mounted in a zigzag manner by each moving roller and each fixed roller while pressing the long molded product with the moving roller row.

An embodiment of the present invention will be described with reference to FIGS. Although the present invention will be described by taking an automobile weather strip as an example, it can also be used for a long molded article having an insert formed by other extrusion molding.
FIG. 1 is a cross-sectional view of an automotive weather strip 50 manufactured by the manufacturing method of the present invention. The weather strip 50 is provided on the upper surface of a weather strip main body 51 and a trim portion 52 which are formed of a trim portion 52 having a substantially U-shaped cross section and a hollow seal portion 58 projecting outward from the trim portion 52 and a cover lip 53 described later. The decorative layer 57 is formed.

The trim portion 52 has a substantially U-shaped cross section, an insert 54 is embedded therein, and a cover lip 53 extending toward the vehicle interior side is provided at an upper portion. The cover lip 53 is partially cut off at a predetermined location. As will be described later, the insert 54 is separated at its connecting portion, and the flexibility of the weather strip 50 is enhanced while maintaining the gripping force of the trim portion 52. Furthermore, the insert 54 may be provided with notches at the positions of the front and rear ends of one long molded product. A plurality of vehicle outer side holding lips 55 and one vehicle inner side holding lip 56 are provided on the inner surface of the trim portion 52 having a substantially U-shaped cross section. A flange of a door or a vehicle body opening edge is inserted into the trim portion 52 and held by the vehicle outer side holding lip 55 and the vehicle inner side holding lip 56, and the weather strip 50 is mounted.
The trim portion 52 is formed of a solid material or a fine foam material such as rubber, thermoplastic elastomer, or soft synthetic resin, and the hollow seal portion 58 is formed of a sponge material such as rubber or thermoplastic elastomer.

A decorative layer 57 is fixed to the upper surface of the trim portion 52 and the upper surface of the cover lip 53 as a covering layer. Since the upper surface of the trim portion 52 and the upper surface of the cover lip 53 can be seen from the inside of the vehicle, the decorative layer 57 needs to change its color according to the color of the interior of the automobile in design. A decorative layer 57 having the following colors is used.
Note that the decoration layer 57 may be configured by a solid material or a fine foam material such as an elastomer or a soft synthetic resin, or may be configured by adhering a fabric.

Next, a method for manufacturing the weather strip 50 will be described.
FIG. 2 is a schematic diagram of the manufacturing process of the weather strip 50. In producing the weather strip 50, first, a continuous long molded product before being cut into a predetermined size is continuously formed by extrusion. Prior to this extrusion, the insert 54 is first manufactured.
The insert 54 is manufactured by inserting a long strip-shaped metal plate into an insert molding machine (not shown) or the like, and punching or rolling the strip-shaped metal plate into a necessary shape as the insert 54.

For example, as shown in FIG. 3 (a), a plurality of strip portions 54c, which are strip-shaped metal plates, are arranged in the width direction, and a fish bone-shaped insert 54 in which the centers of the strip portions 54c are connected by a connecting portion 54d, It can be obtained by punching a strip-shaped metal plate.
Further, as shown in FIG. 3 (b), a strip-shaped metal plate is punched into an oval shape in the width direction to provide a strip portion 54c, and a ladder shape in which connecting portions 54d are provided at both ends of the strip portion 54c. The insert 54 can also be manufactured.

Further, as shown in FIG. 3 (c), a strip-shaped metal plate is provided with a large number of slits while leaving a part in the width direction, and a strip portion 54c and a connecting portion 54d are provided by rolling a portion where no slit is provided. A ladder-like insert 54 can also be manufactured.
Further, as shown in FIG. 3 (d), a ladder-like insert 54 provided with a strip 54c and a connecting part 54d can be manufactured by punching a strip-shaped metal plate into a ladder.

  Next, the insert 54 manufactured as described above is sent to the extrusion molding machine 1 in the same manner as in the prior art, and the insert 54 is coated with synthetic rubber, thermoplastic elastomer, etc., and the trim portion 52 and the hollow seal portion 58 are formed. Then, the weather strip 50 is formed. Then, it transfers to the vulcanization tank 2, and heats and vulcanizes with a hot air or UHF. The trim portion 52 is preferably formed of a solid material, and the hollow seal portion 58 is preferably formed of a sponge material.

  After the vulcanized continuous long molded product is taken up by the take-up machine 3, the connecting portion 54d of the insert 54 is separated by the insert separator 10 in order to improve the flexibility of the long molded product. The insert separator 10 will be described later. The long molded product from which the insert 54 is separated is transferred to the bending roll machine 20, and the trim roller 52 is bent into a substantially U-shaped cross section by the bending roller 21 as shown in FIG. The folded weather strip 50 is subjected to processing such as cutting and end mold forming as described in the prior art, and the weather strip 50 becomes a product.

Next, a method for separating the insert 54 embedded in the trim portion 52 of the weather strip 50 will be described with reference to FIGS.
FIG. 4 is a front view of the insert separator 10 in a state where the moving roller 13 is raised upward before the weather strip 50 is attached. FIG. 5 is a front view of the insert separator 10 with the moving roller 13 lowered downward after the weather strip 50 is attached.

  In the insert separator 10, a large number of moving rollers 13 and fixed rollers 16 are arranged in a row in the horizontal direction. 4 and 5, the moving roller 13 and the fixed roller 16 are provided side by side in the horizontal direction, but the moving roller 13 and the fixed roller 16 may be provided vertically. A plurality of moving rollers 13, four in this embodiment, are attached to the moving roller unit 11. The moving roller 13 is attached by attaching one end of the moving roller holding column 12 to the moving roller unit 11 and attaching the moving roller 13 to the other end of the moving roller holding column 12. The moving roller 13 is rotatably attached to the moving roller holding column 12. The moving roller unit 11 is attached to the insert separator 10 so as to be movable in the vertical direction. A large number of moving rollers 13 can be mounted by mounting a large number of moving roller units 11.

  A plurality of fixed rollers 16 are attached to the fixed roller holding portion 15 one by one in the horizontal direction. The fixed roller holding portion 15 is attached so that the fixed roller 16 can be positioned slightly below the moving roller 13 when the moving roller 13 is positioned above. Accordingly, a gap is provided between the 13 rows of moving rollers and the 16 rows of fixed rollers, and the weather strip 50 can be inserted linearly into the gap. The fixed roller 16 receives rotational force from a motor 18 attached to the insert separator 10 by a belt or the like. Further, the fixed rollers 16 are attached at intervals that allow each moving roller 13 to move up and down between the respective fixed rollers 16.

A take-off roller 17 is provided at the front end where the moving roller 13 and the fixed roller 16 are arranged, and the weather strip 50 from which the insert 54 is separated can be taken up.
A dancer 19 is provided at the entrance where the weather strip 50 is introduced into the insert separator 10. The weather strip 50 is guided by a roller provided at the tip of the dancer 19. When the weather strip 50 is mounted on the insert separator 10 and the moving roller 13 is lowered by the dancer 19, the dancer 19 absorbs the impact on the weather strip 50, and inserts the insert 54 during the separation of the insert 54 of the weather strip 50. Even when the transfer speed of the weather strip 50 in the separator 10, the extrusion molding machine 1, and the vulcanizing tank 2 varies, it is possible to absorb impacts and changes in tension applied to the weather strip 50.

Next, a method for separating the insert 54 of the weather strip 50 will be described.
In order to attach the weather strip 50 in which the insert 54 is embedded in the trim part 52 to the insert separator 10, first, all the moving roller units 11 of the insert separator 10 are lifted upward, and the 13 rows of moving rollers and the fixed roller Create a gap between 16 rows. A weather strip 50 is mounted in this gap. The front end of the weather strip 50 is first sandwiched by the take-up roller 17 so as not to move. Further, the rear part of the long molded product is guided to the dancer 19.

  Then, it is gradually lowered downward from the moving roller unit 11 near the take-up roller 17. As the moving roller unit 11 is lowered, each moving roller 13 pushes the weather strip 50 downward. Since each moving roller 13 moves downward between each fixed roller 16 and the fixed roller 16, the weather strip 50 is bent in a zigzag shape by the fixed roller 16 and the moving roller 13. At this time, since the leading end of the weather strip 50 is held by the take-up roller 17, the weather strip 50 is zigzag and fed from the rear, but the next moving roller unit 11 has not yet moved downward. Therefore, the weather strip 50 can be easily sent.

  When the first moving roller unit 11 is lowered downward, the next moving roller unit 11 is similarly lowered downward. In this way, the moving roller unit 11 is sequentially lowered. If the plurality of moving roller units 11 are lowered at once, abnormal tension is applied when the weather strip 50 becomes zigzag, and the weather strip 50 may be broken. When weathering is lowered, the weather strip 50 does not break.

When the moving roller 13 and the fixed roller 16 are arranged in the vertical direction, for example, the moving roller 13 is provided on the right side of the fixed roller 16 and the weather strip 50 is attached to the gap, and then the moving roller 13 is moved to the left side. And can be bent in a zigzag shape.
In addition, the moving distance of the moving roller 13 of the moving roller unit 11 becomes longer according to the thickness when the thickness of the trim portion 52 of the weather strip 50 is increased. This is because when the rubber or soft synthetic resin layer covering the insert 54 of the weather strip 50 is thickened, the weather strip is placed on the outer periphery of the moving roller 13 and the fixed roller 16 when the distance between the moving roller 13 and the fixed roller 16 is short. This is because 50 cannot be wound sufficiently and the weather strip 50 cannot be bent sufficiently. That is, if the distance between the moving roller 13 and the fixed roller 16 is increased, the weather strip 50 can be sufficiently wound around the moving roller 13 and the fixed roller 16, and the weather strip 50 can be sufficiently bent, The 54 connecting portions 54d can be reliably separated.

  When all the moving roller units 11 are lowered, the take-up roller 17 is rotated, the weather strip 50 is taken out, the motor 18 is moved, and the fixed roller 16 is rotated. The weather strip 50 can be transferred by the rotation of the fixed roller 16 and the take-up roller 17. Since the rotation of the motor 18 is transmitted to the fixed roller 16, the rotation transmission mechanism becomes simpler than when the moving roller 13 is rotated by the motor 18. The moving roller 13 does not give any rotational force from the outside and can freely rotate. Therefore, the moving roller 13 freely rotates as the weather strip 50 is transferred, and therefore does not become a resistance to the weather strip 50 transfer.

  In this way, the trim strip 52 of the weather strip 50 is passed between the fixed roller 16 and the moving roller 13 in a zigzag manner and transferred, whereby the weather strip 50 is transferred by the rotation of the fixed roller 16, The connecting portion 54d of the insert 54 embedded in the trim portion 52 can be reliably separated.

  In addition, when the diameter of the fixed roller 16 is set so as to gradually increase as the direction of the take-off roller 17, that is, the moving direction of the weather strip 50, even if the rotation of the fixed roller 16 is set to the same number of rotations, The rotational distance of the outer periphery of the fixed roller 16 is gradually increased, and the tensile force applied to the weather strip 50 can be gradually increased as the weather strip 50 moves, and the insert 54 embedded in the weather strip 50 is connected. A tensile force can be applied to the portion 54d to promote separation of the insert 54.

It is a cross-sectional shape of the weather strip for motor vehicles manufactured by the manufacturing method of embodiment of this invention. It is a schematic diagram of the process of extruding a weather strip in the manufacturing method of the embodiment of the present invention. It is a perspective view of an insert used for a manufacturing method of an embodiment of the invention. In the insert separator used for the manufacturing method of an embodiment of the invention, it is a front view in the state where the moving roller unit went up. In an insert separator used for a manufacturing method of an embodiment of the invention, it is a front view in the state where a moving roller unit fell below. It is a front view of the insert separator of the conventional weather strip.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Insert separator 11 Moving roller unit 13 Moving roller 16 Fixed roller 50 Weather strip 54 Insert 54c Strip part 54d Connection part

Claims (7)

A long formed product having an insert in which a metal strip is connected by a connecting portion, and a long molded product in which a soft material is coated on the insert by an extruder, and the insert connecting portion is separated by an insert separator. In the method of manufacturing a molded article,
The insert separator has a plurality of moving rollers and fixed rollers arranged in a row,
Before mounting the long molded product for separating the insert, the moving roller row is positioned on one side with respect to the fixed roller row, and a gap is provided between the moving roller row and the fixed roller row, After inserting the long molded product into the gap between the moving roller row and the fixed roller row,
The moving roller row is moved so that each moving roller passes between the fixed rollers of the fixed roller row so as to be on the other side of the fixed roller row, and the long molded product is moved by the fixed rollers and the moving rollers. Bend zigzag,
The long molded product is characterized in that the connecting portion of the insert is separated by pulling the folded long molded product with the take-up unit so as to pass between the rotating fixed roller and the moving roller. Manufacturing method.   The method of manufacturing a long molded product according to claim 1, wherein the moving roller row is moved by moving several moving rollers at a time.   The moving roller is rotatably attached, and the fixed roller is rotated by a motor attached to the insert separator with respect to fixed rollers provided at least on the inlet side and the outlet side of the insert separator. The method for producing a long molded product according to claim 1, wherein the long molded product is transferred in a zigzag manner between the fixed rollers and the moving rollers.   The said fixed roller diameter is a manufacturing method of the long molded product in any one of Claim 1 thru | or 3 which becomes large gradually as the moving direction of the said long molded product.   5. The production of a long molded product according to claim 1, wherein the moving distance of the moving roller train with respect to the fixed roller train is increased according to the thickness when the thickness of the long molded product is increased. Method.   6. The long molded product according to claim 1, wherein the insert separator is provided with an impact absorbing device for relaxing a tensile force of the long molded product at an entrance for taking in the long molded product. Method.   The method for producing a long molded product according to any one of claims 1 to 6, wherein the long molded product is a weather strip that seals a periphery of an opening of an automobile.

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