JPH06210700A - Method and device for processing of molding - Google Patents

Abstract

PURPOSE:To provide the molding processing method and its device which can carry out the extrusion molding for resin or the like smoothly, retain a good cut-off face for a long period of time setting the shape of a cut-off section freely. CONSTITUTION:When a molding 100 extruded continuously through an extrusion opening of a molding die 18 is processed, an end of a thick walled processing blade 12 heated up to the temperature in the vicinity of the melting point of resin by an electric heater 14 is moved back and forth to a processing site just after extrusion and melt cut by the processing blade 12. As the molding 100 is melt cut just after extrusion, the extrusion can be carried out smoothly even if the extrusion speed is fast, and the processing blade 12 scarcely gets damaged to retain a good cut-off face for a long period of time, and the processing blade 12 can be manufactured by cut processing tool steel, and the shape of the blade can be set freely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method and apparatus for changing the cross-sectional shape of an extrusion molding along its longitudinal direction.

[0002]

2. Description of the Related Art In order to prevent the visibility of the side glass portion from being deteriorated when a wiper is used in running a vehicle in the rain, groove lips (the groove lip and the windshield) are formed along the left and right end edges of the windshield on the outer surface of the windshield. A so-called rain garter is formed between the and, and this groove lip stops the rainwater that is blown to the left and right sides by the wiper, and the rainwater that has been damped flows along the rain garter to the side glass of the rainwater. There is a windshield molding for automobiles that is designed to prevent the wraparound of the vehicle. When integrally molding such a windshield molding by extrusion, if there is a groove lip in the roof part or the like, there is a disadvantage such as increased air resistance,
It is necessary to form groove lips only where it is needed.

As a method of processing a windshield molding in which such groove lips are provided only in the side moldings, a molding having a constant cross-sectional shape (shape having the groove lips) is extruded and then cooled and solidified. Method of cutting unnecessary parts with a tool etc. as a step (first method) When extruding and molding a molding, a thin plate-like tool such as a cutter blade is advanced and retracted with respect to the molding, and the unsolidified molding immediately after extrusion Method of cutting off unnecessary parts (second method) Method of changing shape of resin flow path in extrusion mold and changing cross-sectional shapes of products at different positions along the longitudinal direction (third method) ) Etc. are known.

[0004]

However, in the above-mentioned first method of the related art, since a step of removing unnecessary portions is required as a step after solidification of the extrusion-molded molding, the number of processing steps increases and Equipment is required for this, which also causes a cost increase. Further, in this case, the unnecessary portion is usually cut off after cooling the extruded molding in a water tank, so that the cut surface becomes rough and the appearance may be impaired. Further finishing is required to correct this.

In the above-mentioned second conventional method, a thin blade is used in order to simplify the apparatus, etc., and therefore it is difficult to process the cut into a shape other than a straight line or an arc shape having a large radius. Also, the types of designs are limited as moldings that are also ornaments. Moreover, since a thin blade is used, the durability of the blade edge becomes a problem, and it is difficult to maintain a smooth cut edge for a long time.

In the above-mentioned third conventional method, since the mold structure is inevitably complicated, it becomes expensive, and the mold must be modified to change the shape, which is very troublesome. There was an inconvenience.

The present invention has been made in view of the above circumstances, and an object thereof is to maintain a smooth cut end for a long period of time particularly when processing a molding molded by extrusion of a resin or the like. The present invention is to provide a molding processing method and an apparatus therefor.

[0008]

In the molding method according to the present invention, when a molding having a constant cross-sectional shape made of a resin continuously extruded through an extrusion opening of an extrusion die is heated by a heating means. A method is adopted in which the tip of the thick working blade is moved forward and backward with respect to the continuously processed portion of the window molding that is extruded, and the cutting is performed by the working blade.

The molding apparatus according to the present invention is
A thick processing blade that reciprocates along the end surface on the extrusion side of the extrusion die at a position close to the extrusion opening of the extrusion die, and the processing blade is driven, and the tip portion of the processing blade is It has a processing blade drive mechanism for moving the molding blade forward and backward to a processing portion of the molding extruded through the extrusion opening, and heating means for heating the processing blade.

[0010]

According to the molding method of the present invention, since the thick processing blade is used, it has a large heat capacity, a small temperature change, and can withstand high temperature heating. For this reason, by heating the processing blade near the melting point of the molding resin, the processing portion of the window molding is melt-cut by the processing blade, and cutting is performed while the molding immediately after extrusion is in a high temperature state, so only the cutting tool is used. The cut surface becomes rounder and the cut surface becomes smoother than when cutting. Since it is melt-cutting, the wear of the cutting edge of the processing blade is reduced, and according to the molding processing apparatus of the present invention, when the molding having a constant cross-sectional shape is continuously extruded through the extrusion opening of the extrusion die. The machining blade is driven by the machining blade driving means, and the tip portion of the machining blade heated by the heating means is moved forward and backward with respect to the machining portion of the molding which is continuously extruded at a position close to the extrusion opening.
For this reason, if the processing blade is heated near the melting point of the molding resin, cutting is performed while the molding immediately after extrusion is in a high temperature state, resulting in roundness and smooth cut surface. Further, since the cutting is performed by melting, wear of the cutting edge of the processing blade is reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 3 is a simplified view of an extruded product molding apparatus 200 incorporating the molding apparatus 10 according to the present invention for carrying out the molding method according to the present invention. In the present embodiment, the extruded product molding apparatus 200 is an automobile windshield molding (hereinafter abbreviated as “molding”) 100.
It is used for extrusion molding.

In this extruded product molding apparatus 200, an extruded path indicated by AB in FIG. 3 is provided. The extrusion molding apparatus 200 includes an extrusion head 20 provided near the upstream end of the extrusion path, and the extrusion head 2.
And a molding processing device 10 disposed on the downstream side of 0.

Of these, the extrusion head 20 has a first duct 14, a second duct 16 and a third duct 24 to which different kinds of resins are supplied from the outside at constant flow rates.
And a main body portion 26 to which the first duct 14, the second duct 16 and the third duct 24 are joined, and a molding die 18 fixed to a downstream end surface of the main body portion 26. ing. In the main body portion 26, resin passages (not shown) are formed so that each portion of the molding 100 as an extruded product is formed of each resin material. On the upstream end surface of the main body portion 26, the wire rod 1 as a core material is provided.
A feed port 26 </ b> A is formed to feed 10 into the body 26. By this extrusion head 20, the molding 100 is extruded to the downstream side of the extrusion path (see arrow C) through an extrusion opening described below formed in the molding die 18, and at the time of this extrusion, the wire rod 110 is moved to the molding 100. It is designed to be embedded as a core material.

As shown in an enlarged view in FIG. 1, an extrusion opening 28 having substantially the same cross-sectional shape as the molding 100 (see FIG. 5) is formed on the downstream end surface (extrusion side end surface) of the molding die 18. Has been done. This extrusion opening 2
8 is a molding 1 as shown enlarged in FIG.
No. 00 00 (see FIGS. 4 and 5) to form the first opening 28A formed along the longitudinal direction (the vertical direction in FIG. 1) of the molding die 18 and the holding lip of the molding 100. In order to form 104 and 106 (see FIGS. 4 and 5), a second opening 28A is formed from the upper end and the lower end in FIG.
The opening 28B, the third opening 28C, and the panel lip 108 (see FIGS. 4 and 5) of the molding 100 are formed from the upper end of FIG. 1 of the first opening 28A to the left. A fifth opening formed from the lower end of the first opening 28A toward the left side in FIG. 1 to form the fourth opening 28D and the decorative lip 110 (see FIGS. 4 and 5) of the molding 100. 28E and a sixth opening 28F that is formed from the lower end of the first opening 28A in FIG. 1 to the lower right in order to form the groove lip 80 (see FIGS. 4 and 5) of the molding 100. Become.

As shown in FIG. 1, the molding apparatus 10 has a processing blade 12 that reciprocates along the longitudinal direction (arrow E, F direction) of the sixth opening 28F of the extrusion opening 28. There is. The processing blade 12 is a processing device 10
It is held in a state of being separated from the molding die 18 by a slider 22 (see FIG. 2) which will be described later.
As shown in FIG. 1, the processing blade 12 has a thick wall formed by cutting a tool steel. The processing blade 12 has a tip portion formed into an acute triangular shape with a predetermined angle inclined with respect to the longitudinal direction of the processing blade.
Is formed in a substantially arc shape, but since tool steel is processed, it can be formed in various shapes.

At the base end side of the processing blade 12, the processing blade 12
An electric heater 14 is provided as a heating means for heating the. This processing blade 12 is a molding processing device 1
4 is driven by a machining blade driving mechanism 30 which will be described later, and as shown in FIG. 4, the surface is substantially orthogonal to the molding 100 extruded through the extrusion opening 28 of the molding die 18. The sixth opening 28F of the opening 28 is configured to reciprocate along the longitudinal direction (see arrows E and F in FIGS. 1 to 4). here,
The machining blade 12 is molded by the electric heater 14 to mold 1.
When heated to a temperature in the vicinity of the melting point of the resin that is the material of No. 00, the processing blade 12 advances in the direction of arrow E,
The groove lip 80 of the molding 100 extruded through the extrusion opening 28 is melt-cut by the cutting edge portion 12A of the processing blade 12, and the groove lip 80 of the molding 100 is molded as the processing blade 12 advances in the direction of arrow E. The length becomes shorter (see the first gradual change portion L1 in FIG. 5), and conversely, the protruding length of the groove lip 80 of the molding 100 that is molded as the working blade 12 advances (retracts) in the direction of the arrow F becomes longer. (The second gradual change part L2 in FIG. 5)
reference).

The machining blade drive mechanism 30 constitutes the machining apparatus 10 together with the machining blade 12 and the electric heater 14, and as shown in FIG. 2, a pulse motor (hereinafter, abbreviated as "motor") as a drive source. 32) and a motion conversion mechanism 34 for converting the rotational motion of the motor 32 into the linear motion of the slider 22. A drive source may be configured by using a servo motor or a stepping motor instead of the pulse motor 32.

At the upper end of the slider 22, as described above,
The processing blade 12 is held in a state of being separated from the downstream end surface of the forming die 18, and the slider 22 is formed on the downstream end surface (the left end surface in FIG. 2) of the forming die 18 as shown in FIG. When reciprocating along the formed guide groove 18A, the working blade 12 moves linearly while maintaining a state in which it is separated from the downstream end surface of the molding die 18.

As shown in FIG. 2, the motion converting mechanism 34 is rotationally driven by a motor 32 disposed on a base 68, and a male screw of a ball screw is formed on the outer peripheral portion thereof over the entire length. A drive shaft 36 and a moving member 38 in the shape of a rectangular parallelepiped having a circulating ball nut (not shown) screwed onto the drive shaft 36 via a ball are provided therein. The motor 32 is mounted on the base 68 via a rectangular mounting plate 78.

A first universal joint 62 is provided on the downstream side surface (the arrow X in FIG. 2 indicates the flow direction of the resin) of the moving member 38, and the first universal joint 62 is connected.・ Rod 64
Is connected to a second universal joint 66 provided on the slider 22. In addition, the moving member 3
Rectangular plate-shaped first and second fixing members 70 and 72 are arranged on both sides sandwiching 8 to face the moving member 38. These first and second fixing members 70 and 72 are mounted on a base 68. It is fixed to. A pair of guide shafts 74, 74 are installed between the first and second fixing members 70, 72 in parallel with the drive shaft 36 and sandwich the drive shaft 36. Moving member 38
Penetrates through. Corresponding to these guide shafts 74, 74, the moving member 38 has a pair of cylindrical guides 76,
76 is provided.

According to the machining blade drive mechanism 30 thus constructed, the drive shaft 3 is rotated by the rotation of the motor 32.
6 rotates, the rotation of the drive shaft 36 causes the moving member 38 to move the drive shaft 36 and the guide shaft 74,
The slider 22 and the machining blade 1 held by the slider 22 move at the same time as the moving member 38 reciprocates.
2 reciprocates as described above.

The base 68 is fixed to a base 92, and the base 92 is fixed to the molding die 18 by mounting bolts 90.

As shown in FIG. 3, the motor 32 is controlled to rotate / stop by the control unit 40.
The control unit 40 includes a CPU, a RAM, an RO (not shown).
A controller 42 configured to include an M, I / O interface and the like, and a pulse generator 44 that receives a command from the controller 42 and generates a pulse for driving a motor.
And a motor driver 46 that drives the motor 32 by receiving the pulse output from the pulse generator 44. In FIG. 3, the controller 42
Although the case where the pulse generator 44 and the pulse generator 44 are separately provided is shown, an integrated pulse generator and controller, that is, a controller also having a pulse generating function may be used.

The controller 42 includes an external input device 48.
Is connected so that an operator inputs a measurement start command, which will be described later, and various data for motor control. Further, the output of a rotary encoder 50 that generates a pulse corresponding to the number of rotations of a pulling roller drive motor (not shown), which will be described later, is input to the controller 42.

On the downstream side of the extrusion head 20, a sizing 52 is attached to the upstream side wall of the cooling water tank 5 for cooling.
4 are arranged. The sizing 52 is the molding die 18
This is for finishing the molding 100, which is extruded through the and has a high temperature immediately after extrusion and is in an expanded state to some extent as compared with the product, to the design size of the product. On the further downstream side of the water tank 54, a pair of upper and lower pulling rollers 56, 58 for sandwiching and pulling the molding 100 sent to the downstream side via the water tank 54 and further feeding it to the downstream side (see arrow D). It is provided. These tension rollers 5
6, 58 are driven by a motor (not shown),
The number of rotations of this motor is the rotary encoder 50 described above.
Detected by this rotation speed and the tension rollers 56, 5
8 rotation speed and forming die 18 to pulling roller 56,
Based on the distance to the location where 58 is located (these are known), the length of the extruded molding 100 can be detected.

The RAM of the controller 42 stores data such as the rotational speeds of the pulling rollers 56 and 58 and the distances from the molding die 18 to the positions where the pulling rollers 56 and 58 are arranged, and the ROM of the controller 42. A groove lip 80 (FIGS. 4 and 5) of the molding 100, which is input by an operator through the external input device 48, is provided therein.
A control algorithm for controlling the motor 32 based on the output of the rotary encoder 50 is stored according to the protrusion length setting data (see FIG. 5), the groove lip interval setting data (see L3 and L4 in FIG. 5), and the like.

Next, the operation and the like of the extruded product molding apparatus 200 configured as described above will be described.

The first, second, and third parts constituting the extrusion head 20.
Different kinds of resins are supplied at a constant flow rate into the main body 26 through the third ducts 14, 16 and 24, and at the same time, the wire rod 110 is supplied from the supply port 26A into the main body 26. It is assumed that

These resins reach the molding die 18 through the resin passages (not shown) in the main body 26. As a result, the molding 100 in which the wire 110 is incorporated as a core material in the center of these resins through the extrusion opening 28 of the molding die 18 is an extrusion path (AB).
Is continuously extruded downstream.

This extruded molding 100
Is finished in the design size of the product while being cooled in the water tank 54 provided with the sizing 52, and is further delivered to the downstream side. Next, this sent molding 10
When 0 reaches the upstream end of the pulling rollers 56, 58, the operator operates the external input device 48 to instruct the start of measurement, the projection length setting data of the groove lip 80 of the molding 100, the groove lip interval setting data, etc. Enter in sequence.

The controller 42 takes in a pulse signal corresponding to the motor rotation speed detected by the rotary encoder 50, and the length measurement of the sent molding 100 is started. The controller 42 controls the rotation of the motor 32 in synchronization with the measurement data via the pulse generator 44 and the motor driver 46, and the rotation of the motor 32 is converted into the reciprocating motion of the slider 22 by the motion converting mechanism 34. To be done. As a result, the working blade 12 moves linearly in the direction of arrow E or F of FIGS. 1 to 4 together with the slider 22, and the position of the cutting edge portion 12A of the working blade 12 is controlled.

In this way, the processing blade 12 is adjusted according to the length of the molding 100 fed from the molding die 18.
The blade edge portion 12A is moved forward and backward with respect to the groove lip 80 which is a processed portion of the molding 100. At this time, the processing blade 12 is heated by the heater 14 to a temperature near the melting point of the resin that is the extruded material, and the processing blade 12 causes
The groove lip 80 is melt-cut. As a result, the groove lip 8
A protrusion length of 0 is varied in a desired manner along the length of the molding 100.

For example, when forming the molding 100 as shown in FIG. 5, the side molding 10 is formed.
In order to shift from 0A to the molding of the upper molding 100B (this transition portion is indicated by the first gradually changing portion L1 in FIG. 5), the machining blade 12 is gradually linearly moved in the direction of the arrow E during the molding. The upper molding has a shape in which the protruding length of the groove lip 80 is gradually shortened, and the depth of the rain garter formed between the groove lip 80 and the windshield is gradually reduced and disappears in the vehicle body mounted state. It is transferred to 100B molding.

On the contrary, in order to shift from the upper molding 100B to the molding of the side molding 100A (this transitional portion is indicated by the second gradually changing portion L2 in FIG. 5), the working blade 12 is moved to the arrow F during the molding. When the groove lip 80 is gradually moved linearly in the direction of, the protruding length of the groove lip 80 gradually becomes longer, and the depth of the rain garter formed between the groove lip 80 and the windshield gradually becomes deeper when the vehicle body is mounted. , When the processing blade 12 reaches the maximum retracted position,
After that, the groove lip 80 having a constant protruding length is formed.

As described above, according to this embodiment,
Since the thick processing blade 12 is used, it has a large heat capacity, a small temperature change, and can withstand high temperature heating. Therefore, by heating the processing blade 12 to near the melting point of the molding resin with the electric heater 14, the molding 10
The groove lip 80, which is the processed portion of 0, is melt-cut by the processing blade 12, and the cutting is performed while the molding 100 immediately after extrusion is in a high temperature state, so that the rounded surface is formed and the cut surface becomes smooth. Further, since it is a fusing cutting, the processing blade 12
The blade edge 12A is less worn, and a glossy and smooth cut end can be maintained for a long period of time.

Further, since the working blade 12 is formed by cutting the tool steel, the shape of the cutting edge can be freely set. Immediately after extrusion, the groove lip 80 of the molding 100
Since it is melt-cut, it is hardly affected even when the extrusion speed is increased, and a normal extrusion head 20 can be used.

Further, a drive motor (not shown) for pulling rollers 56 and 58 arranged on the downstream side of the extrusion head 20.
Since the rotary encoder 50 detects the number of rotations of the groove, even if the molding of the type in which the wire 110 is not embedded is formed, the protrusion length of the groove lip is set by the input data from the external input device 48. As described above, it is possible to change along the longitudinal direction, and by changing this input data, the protruding length of the groove lip can be arbitrarily changed.

Instead of the controller 42 of the type in which the operator inputs desired data, a controller of the type that controls the machining blade drive mechanism 30 according to a predetermined program without external input is used. If you do like this, molding 1 automatically
00 can be continuously produced.

Further, in the above-mentioned embodiment, the case of forming the molding for the windshield by using the extruded product molding apparatus 10 is illustrated, but it is used for molding the molding for the rear glass, or along the other longitudinal direction. It may be used for molding an extruded product whose cross-sectional shape changes.

Further, in the above-mentioned embodiment, the case where the working blade is separated from the molding die by several separations is illustrated in order to prevent the resistance against extrusion from being unnecessarily increased, but the present invention is not limited to this. The processing blade may be in contact with the extrusion die and slid.

[0042]

As described above, according to the present invention,
When processing a molding formed by extrusion of a resin or the like, there is an unprecedented excellent effect that a smooth cut end can be maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a main part of an embodiment of a molding processing apparatus of the present invention.

FIG. 2 is a schematic perspective view showing the entire molding apparatus of FIG.

FIG. 3 is a block diagram showing a configuration of an extruded product molding apparatus incorporating the molding processing apparatus of FIG.

FIG. 4 is a diagram showing a molding method by the molding apparatus of FIG.

FIG. 5 is a diagram for explaining an example of molding processing.

[Explanation of symbols]

 10 Molding Processing Device 12 Processing Blade 14 Electric Heater (Heating Means) 18 Molding Die (Extrusion Mold) 28 Extrusion Opening 30 Processing Blade Drive Mechanism 80 Groove Lip (Processing Site) 100 Molding

Claims (2)

[Claims] 1. When processing a resin molding that is continuously extruded through an extrusion opening of an extrusion die, the tip of a thick processing blade heated by a heating means is continuously extruded. A molding processing method of advancing and retracting the processed portion immediately after extrusion of the molding, and performing melt cutting with the processing blade. 2. A thick processing blade that reciprocates along an end surface on the extrusion side of the extrusion die at a position close to the extrusion opening of the extrusion die, and the machining blade is driven while the machining blade is driven. A molding processing device comprising: a processing blade drive mechanism that advances and retracts the tip of the processing blade to and from a processing portion of the molding that is extruded through the extrusion opening; and a heating unit that heats the processing blade.