JPH07276356A - Manufacture of rubber parts for motor car having roughened surface - Google Patents

Abstract

PURPOSE:To provide a manufacture of a rubber product for a motor car possessing roughened surface which is preferable as an adhesive surface can be formed comparatively easily on a fixed part without performing troublesome buff processing. CONSTITUTION:Extrusion molding is performed by making use of unvulcanized rubber 9 as a material. Then the first uncured intermediate product 10 as parts precursor possessing a fixed sectional form is formed. A peeling body 5 is pressure-contacted to the fixed part of the first uncured intermediate product 10. The unvulcanized rubber 9 within the second uncured intermediate product 12 as the parts precursor is vulcanized. The peeling body 5 is peeled off from a cured intermediate product 13 as the parts precursor. Then microscopic unevenness is produced on a part where the peeling body is pressure-contacted in the surface of the cured intermediate product 13 and the roughened surface 2 which is preferable as the adhesive surface is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rubber part for a vehicle having a rough surface, and more particularly to a rubber for a vehicle such as a weatherstrip having a rough surface suitable as an adhesive surface for mounting. The present invention relates to a method of manufacturing a manufactured component.

[0002]

2. Description of the Related Art As a typical example of a rubber component used in an automobile, various weather strips mounted on, for example, a door portion, a side window portion, a trunk portion and a roof side portion are well known. When mounting this type of weather strip on the body of an automobile, a double-sided tape or an adhesive is generally used as a means for bonding. However, when a rubber-based material such as EPDM (ethylene / propylene / diene copolymer) is selected, the weather strip may be difficult to adhere due to the oil content leaching from the inside. From the above, conventionally, a measure has been taken in which a rough surface to be an adhesive surface is formed by buffing a part of the weather strip.

[0003]

However, conventionally, in order to form a rough surface on a part of the weather strip, it was necessary to perform buffing by hand. Therefore, there is a problem that the workability is poor and the cost is high. Therefore, there has been a strong demand for a method capable of forming a rough surface relatively easily without performing buffing.

The present invention has been made in view of the above circumstances, and an object thereof is to relatively easily form a rough surface suitable as an adhesive surface in a predetermined portion without performing troublesome buffing. It is an object of the present invention to provide a method for producing an automobile rubber product having a rough surface that can be obtained.

[0005]

In order to solve the above problems, according to the invention of claim 1, a component precursor having a predetermined cross-sectional shape is formed by extrusion molding using unvulcanized rubber as a material. The step of, the step of crimping a peeling body to a predetermined portion of the component precursor, the step of vulcanizing the unvulcanized rubber in the component precursor, and peeling the peeling body from the component precursor, The gist thereof is a method for producing a rubber component for automobiles having a rough surface, which comprises a step of forming a rough surface on a portion of the surface of the component precursor where the peeling body was pressure-bonded.

According to a second aspect of the present invention, in the first aspect, the exfoliation body is extruded using the same material as the unvulcanized rubber for forming the component precursor, and before the vulcanization step. The gist of the invention is to press-bond a peeling body to a predetermined portion of a component precursor and then simultaneously vulcanize unvulcanized rubber in the component precursor and the peeling body.

According to the invention of claim 3, in claim 2, the unvulcanized rubber is EPDM.

[0008]

According to the first to third aspects of the present invention, the component precursor having a predetermined cross-sectional shape is formed from the unvulcanized rubber as the material by first performing the extrusion molding. After the extrusion molding step, a peeling body is pressure-bonded to a predetermined portion of the uncured component precursor. After the crimping step, the unvulcanized rubber in the component precursor in which the peeling body is crimped is
It is cured by being vulcanized. After the vulcanization step, the peeling body is peeled from the cured component precursor. Along with the peeling at this time, minute unevenness is formed on the part of the surface of the component precursor where the peeled body is pressure-bonded. Through the above steps, an automobile rubber component having a rough surface suitable as an adhesive surface is manufactured.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a method of manufacturing a weatherstrip having a rough surface will be described in detail below with reference to FIGS.

The weather strip 1 of this embodiment is specifically a door weather strip mounted on the roof side of an automobile. As shown in FIG. 5, the weather strip 1, which is a finished product, is a rubber component having a long shape and a substantially L-shaped cross section. A rough surface 2 used as an adhesive surface is formed on the outer surface of one of the two pieces 1a and 1b of the weather strip 1.

Next, a method of manufacturing the weather strip 1 having the rough surface 2 as described above will be described in the order of steps. First, the extrusion molding process will be described. FIG. 1 shows a part of an extrusion molding device 3 used when manufacturing the weather strip 1. A main material passage 4 for supplying a molding material for the weather strip 1 is provided inside the extrusion molding device 3. Further, a sub-material passage 6 for supplying a molding material for the peeling body 5 is provided immediately next to the main-material passage 4. At the opening of the main material passage 4,
A main die plate 7 having a through hole having the same sectional shape as the weather strip 1 is mounted. Sub-material passage 6
A sub-die plate 8 having a through-hole having a substantially rectangular cross section is attached to the opening of the sub-die plate 8.

In this embodiment, an unvulcanized rubber 9 having the same composition is used as a molding material for the weather strip 1 and the peeling body 5. More specifically, the unvulcanized rubber 9 includes 100 parts by weight of EPDM, 30 parts by weight of carbon, 15 parts by weight of paraffinic process oil, 2 parts by weight of processing aid, 2 parts by weight of vulcanization accelerator, and 2 parts by weight of sulfur. It consists of parts.

In the extrusion molding process, the unvulcanized rubber 9 supplied through the main material passage 4 is the main die plate 7
Is extruded continuously and at a predetermined speed through the through hole. As a result, as shown in FIG. 2, the uncured intermediate product 10 as a first component precursor having a substantially L-shaped cross section is formed. Immediately after the extrusion molding step, the surface of the first uncured intermediate product 10 is still in a generally smooth state.

Similarly, the unvulcanized rubber 9 supplied by the sub-material passage 6 is continuously extruded at a predetermined speed through the through hole of the sub-die plate 8. As a result, as shown in FIG. 2, the peeling body 5 having a substantially rectangular cross section is formed. Immediately after the extrusion molding step, the surface of the peeling body 5 is also in a generally smooth state. Further, the extrusion speed of the unvulcanized rubber 9 in this embodiment is set to be the same on both the main die plate 7 side and the sub die plate 8 side.

After the extrusion molding process, a pressure bonding process is then performed. As shown in FIG. 1, a pressure bonding roller 11 is arranged immediately downstream of the extrusion molding device 3. Then, when the first uncured intermediate product 10 passes through the pressure bonding roller 11, the peeling body 5 is pressure bonded to the outer surface of the one piece 1a of the first uncured intermediate product 10. As a result, the second uncured intermediate product 12 as shown in FIG. 3 is formed.

After the crimping step, a vulcanization step is then carried out. The second uncured intermediate product 12 is continuously conveyed to a vulcanizer (not shown) and then heated at a predetermined temperature for a predetermined time. Crosslinks are formed between the uncured rubber molecules by the action of heat at this time, and the second uncured intermediate product 12
And the peeling body 5 is cured together. Then, the cured second uncured intermediate product 12 is cooled and cut into a predetermined length by a cooling device and a cutting device (not shown). As a result, the cured intermediate product 13 as shown in FIG. 4 is formed.

After the vulcanization / cooling / cutting process, a peeling process is performed by a peeling device (not shown). At this time, minute unevenness is formed on the surface of the cured intermediate product 13 where the peeling body 5 is pressure-bonded, as the peeling body 5 peels. As a result, as shown in FIG. 5, a weather strip 1 having a rough surface 2 suitable as an adhesive surface is manufactured. Incidentally, in this embodiment, the surface roughness is Ra = 100.
A rough surface 2 of about μm or more is obtained.

As described above, according to the manufacturing method of this embodiment, it is possible to form an adhesive surface on a predetermined portion of the weather strip 1 without performing the buffing which has been indispensable in the past. Therefore, the adhesive, the double-sided tape, or the like is easily attached to the adhesion surface of the weather strip 1, and the weather strip 1 is less likely to be peeled off even when mounted on an automobile.

Further, since this manufacturing method mainly has a relatively simple operation of peeling the peeling body 5 from the cured intermediate product 13, it is not particularly troublesome to carry out. Further, since the peeling work can be performed by a machine, there is an advantage that the workability is superior to the manual work. Also, since this method can be basically implemented by existing equipment,
The cost is improved because the buffing device is unnecessary.
Therefore, the manufacturing method of the embodiment is comprehensively superior to the conventional method that requires buffing.

Further, in the manufacturing method of this embodiment, the same material is used as the molding material for the weather strip 1 and the molding material for the peeling body 5. Therefore, it is possible to prevent the weather strip 1 or the peeling body 5 from being damaged due to peeling, and prevent the unevenness of the rough surface 2.

Further, in the case of the cured intermediate product 13 obtained in this embodiment, the peeling body 5 is kept in a pressure-bonded state until it is mounted on an automobile, and the rough surface 2 is used immediately before use.
Can be formed. Therefore, the time from the formation of the rough surface 2 to the mounting can be shortened. In other words, the weather strip 1 can be bonded with less exudation of the oil component, so that the weather strip 1 can be bonded more reliably. Therefore, this manufacturing method is particularly effective when EPDM, which causes a problem of oil content, is selected as a material.

The present invention is not limited to the above embodiment, but can be modified as follows.
For example, (a) the rubber-based material for molding the component precursor 10 is not limited to EPDM, but may be NBR, CR, or the like.

(B) The rubber-based material for molding the peeling body 5 is not limited to the EPDM as in the embodiment, and may be the rubber and the like listed above. Further, not only uncured rubber may be pressure-bonded as in the embodiment, but also cured rubber may be pressure-bonded. Of course, the molding material for the component precursor 10 and the molding material for the peeling body 5 do not necessarily have to be the same.

(C) A method may be adopted in which a minute uneven surface is formed in advance on the surface of the peeling body 5 and the uneven surface is pressure-bonded to the uncured component precursor 10. (D) The component precursor 10 and the peeling body 5 may be formed by a coextrusion molding method. However, according to this method, the degree of pressure bonding between the two increases, so the method of the embodiment is slightly advantageous in view of the ease of the peeling work.

(E) The present invention can be embodied in a weather strip other than the weather strip 1 mounted on the roof side portion as in the embodiment. Further, the present invention is not limited to weather strips and can be of course embodied in other automobile rubber parts such as moldings.

Here, in addition to the technical ideas described in the claims, the technical ideas grasped by the above-described embodiments and other examples will be listed below together with their effects. (1) A weather strip having a rough surface formed by the manufacturing method according to any one of claims 1 to 3 as an adhesive surface. With this configuration, the weather strip is less likely to peel off even when mounted on a vehicle.

(2) A weather strip according to the above-mentioned technical idea 1, wherein the surface roughness of the rough surface is 100 μm or more.
Within this range, the adhesiveness can be further improved. (3) A cured intermediate product of a weather strip which is formed by the extrusion molding step, the pressure bonding step and the vulcanization step in the manufacturing method according to any one of claims 1 to 3, and in which the peeling body is pressure bonded. With this configuration, since the peeling body can be peeled off immediately before use, the adhesiveness of the weather strip is improved.

The technical terms used in this specification are defined as follows. Rubber parts for automobiles: In addition to door weather strips and window weather strips, for example, side moldings,
It also refers to moldings such as bumper moldings, roof drip moldings, wheel arch moldings, and wind moldings.

[0029]

As described in detail above, according to the method for manufacturing a rubber part for automobiles having a rough surface according to claims 1 to 3, a minute amount is formed on a part of the surface of the part due to the peeling of the peeling body. Since such irregularities are formed, it is possible to relatively easily form a rough surface suitable as an adhesive surface at a predetermined portion without performing a troublesome buffing process.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining a method of manufacturing a weather strip having a rough surface in an example.

FIG. 2 is a schematic enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a schematic enlarged cross-sectional view taken along the line BB of FIG.

FIG. 4 is a schematic enlarged cross-sectional view taken along the line CC of FIG.

5 is a schematic enlarged cross-sectional view taken along the line DD of FIG.

[Explanation of symbols]

1 ... Weather strip as rubber parts for automobiles, 2
... rough surface, 5 ... peeling body, 9 ... unvulcanized rubber, 10 ... first uncured intermediate product as a component precursor, 12 ... second uncured intermediate product as a component precursor, 13 ... component precursor Curing intermediate product as a body.

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Claims (3)

[Claims] 1. A component precursor (1) having a predetermined cross-sectional shape obtained by extrusion molding using unvulcanized rubber (9) as a material.
0), a step of pressure-bonding a peeling body (5) to a predetermined portion of the component precursor (10), and vulcanization of the unvulcanized rubber (9) in the component precursor (11). And the peeling body (5) is peeled from the component precursor (13), and a rough surface (2) is formed on a portion of the surface of the component precursor (13) where the peeling body (5) is pressure-bonded. A method for manufacturing a rubber part for an automobile having a rough surface comprising the steps of: 2. The peeling body (5) using the same material as the unvulcanized rubber (9) for forming the component precursor (10).
After extrusion molding, the peeling body (5) is pressure-bonded to a predetermined portion of the component precursor (10) before the vulcanization step, and then the component precursor (12) and the unvulcanized rubber (in the peeling body (5) ( The method for producing a rubber part for automobiles having a rough surface according to claim 1, wherein the vulcanization of 9) is performed simultaneously. 3. The method for producing a rubber part for automobiles having a rough surface according to claim 2, wherein the unvulcanized rubber (9) is EPDM.