JP3254411B2 - Extruder unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die unit of an extruder for extruding a long product such as a glass run or a weather strip for an automobile, and more particularly, to a coating device for applying a coating liquid or the like to a predetermined position of a molded product. The present invention relates to a die unit of an extruder in which a die is overlapped with a front surface of an extrusion die.

[0002]

2. Description of the Related Art A rubber glass run 1 as shown in FIG. 9 is mounted on a door sash portion of an automobile. The glass run 1 guides a peripheral portion of a door glass (not shown) in a slidable manner. When the door glass is completely closed, the space between the door glass and the door sash (not shown) is sealed.

The glass run 1 is formed to have a substantially U-shaped cross section, and an inner lip 2 and an outer lip 3 are extended from both sides of the opening of the U-shape. The inner and outer peripheral edges are guided and sealed, and the end surface of the door glass is sealed by the inner surface of the U-shaped bottom wall 4. A coating liquid 5 is applied to the outer surfaces of the lips 2 and 3 and the inner surface of the bottom wall 4 to reduce sliding resistance with the door glass.

As an apparatus for efficiently producing a long product such as the glass run 1, an extruder as shown in FIGS. 10 and 11 has been conventionally used.

[0005] This extruder is provided with an extrusion die 7 at a tip end of a cylinder 6 for continuously supplying a plasticized rubber material.
And a base unit 9 including a base 8 for application.
The rubber material is formed into a predetermined sectional shape by the extrusion die 7, and the coating die 8 is formed at a predetermined position of the molded product immediately after the molding.
Thus, a paint such as a coating liquid is continuously applied.

The coating die 8 is fixed on the front surface of the extrusion die 7 in a tightly contacted state by polymerization, and a guide hole 10 through which a molded product is inserted is formed at a substantially central portion thereof, and a predetermined hole facing the guide hole 10 is formed. An application port 12 of the paint supply passage 11 is provided at a position. In the case of the glass run 1 described above, the guide hole 10 is formed in a substantially U-shape, and the application port 12 is
Outer surface and bottom wall 4 of inner lip 2 and outer lip 3
Openings are formed at positions corresponding to the inner surfaces of the. Each paint supply passage 11 has a passage groove 13 formed on the end face of the coating die 8 on the extrusion die 7 side, and a through-hole penetrating the coating die 8 in the axial direction and communicating with the passage groove 13. 14
The coating port 12 is provided at an end of the passage groove 13, and a connection pipe 15 connected to a coating material supply device (not shown) is provided on the front side of the coating base 8 of the through hole 14. Is provided.

Therefore, the molded product continuously extruded from the extrusion die 7 passes through the inside of the guide hole 10 of the coating die 8, and when passing through the guide hole 10, each of the coating ports 12
In the above, a coating material such as a coating liquid is applied to a predetermined position in the cross section of the molded article at a continuous time.

This technique is disclosed in, for example, Japanese Patent Publication No. 7-880.
No. 32, for example.

[0009]

However, in the die unit 9 of the above-mentioned conventional extruder, an application port 12 is formed at the end of the application die 8 on the extrusion die 7 side, and the extrusion die 7 is formed. Since the coating is applied from the application port 12 to the surface of the molded product immediately after being extruded from the extruder, the molded product immediately after being extruded from the extrusion die 7 has a variation in the expansion of the molded product, and the coating is applied to the surface of the molded product. There is a problem that the clearance between the openings 12 changes, and as a result, the thickness of the coating applied to the molded product becomes uneven. If the change in the film thickness exceeds the allowable value, the base unit 9 must be readjusted each time, which increases the burden on the operator for the adjustment and increases the loss time. Invite further trouble.

[0010] Therefore, the present invention is to improve the quality of the product and the production efficiency by stably applying the paint to a predetermined position of the molded product immediately after being extruded from the extrusion die. It is an object of the present invention to provide a die unit of an extruder that can be used.

[0011]

Means for Solving the Problems As means for solving the above-mentioned problems, the invention of claim 1 is to provide a coating on a front surface of an extrusion die for forming a long molded product, and at a predetermined position on the surface of the molded product. A coating die for coating is arranged, and the coating die is provided with a molded article guide portion facing the wall surface of the molded product, and an application port is formed at an end of the molded product guide portion on the extrusion die side. In a die unit of an extrusion molding machine, a spacer plate having an expansion permitting portion that allows expansion of a molded product immediately after being extruded from the extrusion die is interposed between the extrusion die and the coating die. I did it.
The molded product extruded from the extrusion die expands momentarily in the expansion allowable portion of the spacer plate, and thereafter, when the outer shape is stabilized, the paint is applied to a predetermined position on the surface from the application hole of the application die.

According to a second aspect of the present invention, in the first aspect of the present invention, at least one of the opposing walls forming the slit is formed outside the inner wall of the extrusion hole of the extrusion die. It was formed so that it might be located, and it was set as the expansion permission part. In the molded product guide slit of the spacer plate, at least one of the opposing walls is located outside the inner wall of the extrusion hole of the extrusion die, so that the molded product is allowed to expand immediately after extrusion at this portion. Release internal pressure of

According to a third aspect of the present invention, in the first or second aspect of the present invention, the molded product is flush with the inner wall of the extrusion hole of the extrusion die at a position on the spacer plate corresponding to the coating die of the coating die. A guide reference plane is provided. For the molded product extruded from the extrusion die, the clearance between the molded product surface and the application port is accurately controlled by the molded product guide reference surface of the spacer plate.

According to a fourth aspect of the present invention, in the third aspect of the invention, a tapered cut surface is formed at the end of the molded product guide reference surface on the side of the extrusion die, and the cut surface portion defines an expansion permitting portion. To be configured. Immediately thereafter, the molded product extruded from the extrusion die expands momentarily at the cut surface portion of the spacer plate, and is thereafter guided along the cut surface to the molded product guide reference surface.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
A description will be given based on FIG.

1 to 6 show a die unit 20 of an extrusion molding machine according to the present invention, and FIG.
0 shows a glass run 21 for a motor vehicle manufactured according to FIG. FIG. 8 is a cross-sectional view of the vehicle shown in FIG. 7 along the line EE. In the figure, reference numeral 22 denotes a door sash of a press-type door, and reference numeral 23 denotes a door glass that moves up and down inside the door sash 22. is there.

As shown in FIG. 8, the glass run 21 has a substantially C-shaped cross section for receiving the periphery of the door glass 23 when the door glass 23 is raised.
A glass run main body portion 24 and a welt portion 26 sandwiched and fixed to the flange portion 25 of the door sash 22;
b, a section from the vehicle inner side wall 27c to the welt portion 26 is formed in a substantially S-shaped cross section (an inverted S-shape viewed from the cross-sectional direction of FIG. 8), and the core metal 28 bent into the same S-shape is formed therein.
Is buried.

At the lower end of the inner wall 27c of the glass run main body 24, an inner lip 29 extending substantially horizontally below the outer wall 27a is provided.
An outer lip 30 shorter than the inner lip 29 is bent and extended obliquely upward on the bottom wall 27b side at the lower end of a. The inner lip 29 has no core 28 embedded therein, so when the door glass 23 rises,
As shown by the dashed line in the figure, the door glass 23 is pushed by the end surface and the peripheral edge portion and flexibly bends obliquely upward to the bottom wall 27b side. The outer surface of the inner lip 29 and the outer surface of the outer lip 30 are coated with a coating liquid a to reduce the sliding resistance between the inner lip 29 and the outer lip 30, and the inner surfaces of the bottom wall 27b and the vehicle outer wall 27a have abrasion resistance. The coating liquid b is applied in order to increase the pressure.

By the way, as shown in FIG. 2, the die unit 20 of the extruder for producing the glass run 21 includes an extrusion die 32, a coating die 33, and a spacer plate 31.
The extrusion die 32 is bolted to a tip of a cylinder (not shown) for continuously supplying a plasticized rubber material, and the coating die 33 and the spacer plate 31 are connected to the extrusion die 32. Spacer plate 3 with coating base 33
1 is bolted to the front surface of the extrusion mouthpiece 32 so as to sandwich it.

The extrusion die 32 is formed by superimposing first and second extrusion plates 34 and 35 formed in a disc shape before and after in the extrusion direction, and these two plates 34 and 35 have different shapes. Extrusion holes 36 and 37 are formed. Second extrusion plate 3 located on the front side (right side in FIG. 2) in the extrusion direction.
5 is formed in the same shape as the cross-sectional shape of the glass run 21 shown in FIG. 8, but the extrusion hole 36 of the first extrusion plate 34 located on the rear side (the left side in FIG. 2) has a welt portion. 26 are formed in a shape without the support lip 38 portion.

The first extruding plate 34 is formed with a bypass hole 39 penetrating in the axial direction (extrusion direction), and extends from the end of the bypass hole 39 along the overlapping surface with the second coating plate 35. A passage groove 40 is formed so as to extend, and the leading end of the passage groove 40 is opened to the support lip forming portion 41 of the extrusion hole 37 of the second extrusion plate 35. That is, the structure of the extrusion die 32 is as follows.
The rubber material is separately supplied to the portion of the support lip 38 where the core metal 28 hinders the rubber material from wrapping around. By adopting such a structure, the reliable support lip 38 is provided.
It is possible to shape.

The coating die 33 is formed by superimposing first and second coating plates 42 and 43 formed in a substantially fan shape before and after in the extrusion direction. Upper slits 42d and 43d that allow the molded article w to pass through the inner lip 29 and lower slits 42e and 43e that allow the molded article w to pass through the outer lip 30 are cut off from the opposite directions with a predetermined vertical offset. Then, slits 42d and 42e and 43d and 43
e are narrowed necks 42c and 43c, and substantially square inner wall guides 42a and 43a are formed at the ends of the necks 42c and 43c.
Reference numeral 43a guides the inner wall of the glass run main body 24 of the molded product w. In this embodiment, the upper slits 42d, 43d, the lower slits 42e, 43
e, neck portions 42c, 43c, and inner wall guide portion 42
Reference numerals a and 43a constitute a molded article guide in the present invention.

The first coating plate 42 has coating holes 46, 47, and 48 at the upper wall portions of the upper slit 42d and the lower slit 42e on the back side and at the portion extending from the lower wall to the one side wall of the inner wall guide portion 42a. Are formed, and the outer surface of the inner lip 29, the outer surface of the outer lip 30, and the bottom wall 27 of the molded product w extruded from the extrusion mouthpiece 32.
The coating liquid can be continuously applied from the application ports 46, 47, and 48 to the inner surface b (see FIG. 8) and the inner surface of the vehicle outer wall 27a. The paint supply passages L ₁ , L ₂ , L communicating with the application ports 46, 47, 48 are provided.
₃ is formed over the first coating plate 42 and the second coating plate 43, and the paint supply passages L ₁ , L ₂ , L
Each end of ₃ is connected to a paint supply device (not shown) via connection pipes 49, 50, 51 projecting from the front surface of the second coating plate. Incidentally, the transverse passage 44 through the neck portion 42c of the paint supply passage L _2, L _3, and 43c,
45, the first coating plate 42 and the second coating plate 4 are offset from each other in the extrusion direction, as shown in FIG.
3 respectively.

The upper slit 42d and the lower slit 42e of the first coating plate 42 are connected to the extrusion die 32 (second
The extruding plate 35) is formed to be slightly larger than the corresponding portion of the extrusion hole 37, and the inner wall guide portion 42a is formed to be slightly smaller than the corresponding portion of the extrusion hole 37. Therefore, both slits 42d, 42 of the first coating plate 42
e and the inner wall guide portion 42a have a gap in the whole area with respect to the molded product w extruded from the extrusion die 32. However, of the two slits 42d, 42e and the inner wall guide portion 42a, one of the opening portions of the application ports 46, 47, 48, that is, one from the upper wall portion of both slits 42d, 42e and the lower wall of the inner wall guide portion 42a As shown in FIGS. 1, 5 and 6, the gap δ between the molded product w (the offset amount with respect to the inner wall of the extrusion hole 37 of the extrusion die 32) is larger than the other portions as shown in FIGS. It is set very small.

On the other hand, the spacer plate 31 is formed in substantially the same shape as the first and second coating plates 42 and 43, and the fan base thereof is also provided with the first and second coating plates 4 and 43.
2 and 43, the upper slit 52 and the lower slit 5
3 are vertically cut at predetermined intervals and cut in the opposite direction (see FIGS. 2 and 3). In the case of this embodiment, the upper slit 52 and the lower slit 53 constitute a molded article guide slit in the present invention, and these opposing walls guide the inner lip 29 and the outer lip 30 of the molded article w. Further, a rectangular inner wall guide portion 54 is provided at the tip of the neck portion sandwiched between the upper slit 52 and the lower slit 53, and this portion guides the inner wall of the glass run main body portion 24 of the molded product w. I have.

As shown in FIGS. 1, 5 and 6, the spacer plate 31 is provided with a coating port 46 of the first coating plate 42,
47, 48, that is, both slits 52,
53 and a portion extending from the lower wall of the inner wall guide portion 54 to one of the side walls is the extrusion die 32 (the second extrusion plate 3).
It is formed so as to be flush with the inner wall of the extrusion hole 37 of 5), and these portions constitute the molded article guide reference surfaces 55a, 56a, 57a in the present invention.
Then, both slits 52, 53 of the spacer plate 31
And the other part of the inner wall guide part 54, that is, both slits 5
2 and 53, and the other side wall of the inner wall guide portion 54 is located outside the inner wall of the extrusion hole 37 of the extrusion die 32, that is, the step α is formed with respect to the inner wall of the extrusion hole 37. It is formed so that it can be done. The step α portion constitutes a swellable portion in the present invention, and allows a momentary expansion of the molded product w immediately after being extruded from the extrusion die 32. The spacer plate 31 of this embodiment does not have a portion for guiding the outer side of the glass run main body portion 24 of the molded product w, and it is possible to escape a momentary expansion of the molded product w at that portion. The part without the guide part substantially constitutes a part of the expansion permitting part in the present invention.

The relatively thick inner lip 29
In the upper slit 52 that allows the passage of the molded product w, a structure for allowing the expansion of the molded product w is additionally provided on the upper wall (molded product guide reference surface 55a) side. That is, FIGS. 1 and 3
As shown in the figure, the extrusion die 3 of the molded article guide reference surface 55a
A cut surface 55b having a tapered chamfered corner is formed at the end on the second side, and the cut surface 55b is formed between the extrusion die 32 (second extrusion plate 35) and a triangular expansion space. (Expansion permitting portion). The cut surface 55b may be formed on other molded product guide reference surfaces 56a and 57a.

In the above configuration, when manufacturing the glass run 21, the plasticized rubber material is continuously supplied to the base unit 20 from a cylinder (not shown), and at the same time, it is bent to a predetermined cross section in advance. The elongated core 28 is continuously pulled out from the unit 20. In this manner, the plasticized rubber material and the core 28 are combined with the base unit 20.
, A molded product w having a predetermined cross-sectional shape in which the core metal 28 is embedded is continuously extruded from the extrusion die 32.

At this time, the molded product w extruded from the extrusion die 32 of the die unit 20 is the spacer plate 31.
When passing through the coating die 33 and passing through the coating die 33, the outer surface of the inner lip 29 portion, the outer lip 30
The coating liquid is applied to the outer surface of the portion and the inner surfaces of the vehicle outer wall 27a and the bottom wall 27b, respectively.

Here, the molded product w immediately after being extruded from the extrusion die 32 is momentarily expanded in the spacer plate 31 and the accumulated internal pressure is released there, and the shape is shrunk again and stabilized. By the way, the coating base 33
You will be guided to When the molded product w passes through the spacer plate 31, the coating liquid application surface of the molded product w is applied to the molded product guide reference surface 55 a of the spacer plate 31.
The coating port 4 of the coating die 33 in contact with 56a, 57a
6, 47, 48, the gap δ between the molded product w and each of the application ports 46, 47, 48 is always controlled to an appropriate value.
The film thickness of the coating liquid applied from the application ports 46, 47, 48 is always maintained at a stable thickness.

The inner lip 29 portion of the molded product w expands momentarily at the step α portion of the upper slit 52 of the spacer plate 31 and the cut surface 55b immediately after being extruded from the extrusion mouthpiece 32. The upper surface side of the molded product w expanded at the part is gradually guided to the molded product reference surface 55a along the cut surface 55b while gradually contracting. For this reason, the portion expanded on the upper surface side of the molded product w is guided by the guide reference surface 55a without being caught by the end of the molded product reference surface 55a. In addition, the gap δ is maintained constant even when the coating liquid is applied immediately after passing through the guide reference surface 55a. Therefore, the application of the coating liquid to the molded product w is stably performed with a more uniform thickness.

Then, the molded article w to which the coating liquid has been applied as described above is subjected to a vulcanization treatment by a high-frequency heating device (not shown) or the like, and cut into appropriate lengths.

The base unit 20 of this embodiment allows the spacer plate 31 to momentarily expand the molded product w immediately after being extruded from the extrusion hole 37 of the extrusion die 35 as described above. Since the coating liquid can be applied to the stable molded product w from the coating die 33 so that the film thickness becomes uniform, the quality of the glass run 21 to be manufactured is improved, and the frequency of adjustment of the die unit 20 is reduced. The production efficiency is greatly improved by the decrease.

[0034]

As described above, according to the first aspect of the present invention, there is provided a spacer having an expansion permitting portion between an extrusion die and a coating die which permits expansion of a molded product immediately after being extruded from the extrusion die. Since the plate is interposed, the internal pressure is released at the expansion allowable portion of the spacer plate, and a molded product having a stable external shape can be positioned at the application port of the coating die. As a result, the expansion of the molded product immediately after extrusion is performed. A paint having a stable thickness can always be applied to the surface of the molded article regardless of the variation. Therefore, according to the present invention, the quality of the product is improved, and the frequency of adjustment of the coating die is reduced, so that the production efficiency is certainly improved.

According to a second aspect of the present invention, in the first aspect of the present invention, the molded product guide slit provided in the spacer plate is formed such that at least one of the opposing walls forming the slit is located outside the inner wall of the extrusion hole of the extrusion die. Since it is formed so as to be positioned so as to be an expansion permitting part, it allows for an instantaneous expansion of the molded product in the molded product guide slit, and always stabilizes the outer shape of the molded product guided to the application port of the application die. be able to.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the molded product is flush with the inner wall of the extrusion hole of the extrusion die at a position on the spacer plate corresponding to the coating die of the coating die. Since the guide reference surface is provided, the clearance between the molded product surface and the application port is accurately controlled by the molded product guide reference surface of the spacer plate, and the paint applied to the molded product is maintained at a desired film thickness. Can be.

According to a fourth aspect of the present invention, in the third aspect of the invention, a tapered cut surface is formed at the end of the molded product guide reference surface on the side of the extrusion die, and the cut surface constitutes an expansion permitting portion. As a result, the molded product extruded from the extrusion die is allowed to expand momentarily at the cut surface of the spacer plate, and then the molded product with a stable external shape is smoothly guided to the molded product guide reference surface along the cut surface. As a result, the molded article does not move on the molded article guide reference plane, and the paint can be stably applied to the molded article with a uniform thickness.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 4 showing one embodiment of the present invention.

FIG. 2 is a perspective view showing the same embodiment.

FIG. 3 is a rear view showing the same embodiment.

FIG. 4 is a perspective view showing the same embodiment.

FIG. 5 is a sectional view of the same embodiment taken along line BB of FIG. 4;

FIG. 6 is an exemplary sectional view taken along line CC and DD of FIG. 4 showing the embodiment;

FIG. 7 is a sectional view of the vehicle showing the embodiment.

FIG. 8 is a sectional view of the same embodiment taken along line EE of FIG. 7;

FIG. 9 is a sectional view showing a conventional technique.

FIG. 10 is a sectional view showing a conventional technique.

FIG. 11 is a rear view showing a conventional technique.

[Explanation of symbols]

 Reference numeral 20: base unit, 31: spacer plate, 32: extrusion base, 33: coating base, 42a: inner wall guide (molded product guide), 42d: upper slit (molded product guide), 42e: lower slit ( 52, upper slit (molded product guide slit), 53 ... lower slit (molded product guide slit), 55a, 56a, 57a: molded product guide reference surface, 55b ... cut surface (expandable portion), α: step (expandable portion), w: molded product.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-138712 (JP, A) JP-A-6-246813 (JP, A) JP-A-5-253997 (JP, A) JP-A-8- 66955 (JP, A) Japanese Utility Model Hei 6-68813 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 47/00-47/96 B60J 1/16 B60J 5/00

Claims (4)

(57) [Claims] An extrusion die for applying a paint to a predetermined position on the surface of a molded product is disposed in front of an extrusion die for molding a long molded product, and the application die faces the wall surface of the molded product. In a die unit of an extruder in which a molded product guide portion is provided and an application port is formed at an end of the molded product guide portion on the extrusion die side, between the extrusion die and the coating die. A die unit of an extruder, characterized by interposing a spacer plate having an expansion permitting portion for permitting expansion of a molded product immediately after being extruded from an extrusion die. 2. A molded article guide slit provided in the spacer plate is formed such that at least one of opposing walls forming the slit is located outside an inner wall of an extrusion hole of an extrusion die. The die unit of the extruder according to claim 1, wherein the die unit is a part. 3. A molded article guide reference surface which is flush with an inner wall of an extrusion hole of an extrusion die at a position on the spacer plate corresponding to an application hole of an application die. 3. The die unit of the extrusion molding machine according to 1 or 2. 4. The expansion guide according to claim 3, wherein a tapered cut surface is formed at the end of the molded product guide reference surface on the extrusion die side, and the cut surface portion constitutes an expansion permitting portion. The die unit of the extrusion molding machine as described in the above.