JPH0367617A - Treatment structure for flash of resin molded product - Google Patents

Abstract

PURPOSE:To make an appearance favorable without projecting flashes from a molded product after uniting through simple operation, by a method wherein after continuous formation of a flashlike projected matter on a resin molded product along a split part of a mold, the same is bent by facing on the surface of the resin molded product and stuck to the surface unitarily by making use of an adhesive agent. CONSTITUTION:A flashlike projected matter 11 projected outward is formed beforehand on the tip part 1a of a resin molded product 1 such as an air spoiler by making use of a mold 15. The same is provided on the resin molded product 1 in a projected state by keeping a comparatively thick thickness such as that 2-4 times as thick as ordinary flashes. Then desired coating treatment is performed on the surface of the resin molded product, the flashlike projected matter 11 is bent in the direction of an arrow D, that is, the direction where it is on the lower side of the resin molded product 1 and comes into contact with a member 7 to be fitted, stuck unitarily to the surface by making use of an adhesive agent 12, connected with the member 7 to be fitted and uniting is completed. Therefore, after uniting, the flashlike projected matter 11 becomes a state where the same is put between the resin molded product 1 and the member 7 to be fitted, through which the same is concealed from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a structure for removing burrs generated on the surface of a resin molded product having a predetermined shape when the molded product has a predetermined shape using a mold. .

2. Description of the Related Art Conventionally, when manufacturing a resin molded product 1 such as an air spoiler shown in FIG. 5 by an injection molding method using a mold, the process after molding as shown in the cross-sectional view of FIG. Since burrs 2 and 3.4 are likely to occur on the A, B and 0 parts of the surface of the molded product, various measures have been taken to treat such burrs 2 and 3.4. The above A part 2 B part and 0 part correspond to the dividing part of the mold, that is, the part commonly called the parting line, and the above-mentioned ribs 2 and 3.4 are unavoidably placed in such parts. It is normal for this to occur.

As a general method for removing burrs, the above burr 2゜3.4
After cutting with a cutter and surface treatment with sandpaper, etc., the material is transferred to the painting process.
A method is known in which a heated trowel is brought into contact with a trowel 2, 3, 4 in sequence, carbonized, and then removed using a puff or the like.

In addition, 5 and 6 shown in FIG. 6 are core materials having hardness, 7 is a member to be attached such as a vehicle body panel, and the resin molded product 1 is connected to the air spoiler using a connecting tool 8 supported by the core material 6. It is fixed to the attached member 7 as a.

On the other hand, Japanese Utility Model Application Publication No. 6:3-264309 discloses the above-mentioned deburring method as shown in FIG. A means is disclosed in which the deburring trowel 9 is moved in a composite direction of the continuous direction of the burrs and the axial direction of the deburring trowel 9 after the burrs 9 are brought into contact with each other. According to such means, different parts of the side surface of the deburring trowel 9 can always be brought into contact with the burr 2, and the effect that the burr 2 does not remain on the product can be obtained.

Problems to be Solved by the Invention However, among these conventional deburring methods, the means for cutting the burrs using a cutter or sequentially removing them using a heated trowel are mainly operated manually by the operator. However, there is a problem in that the operator is used to cutting or removing not only the banner but also the skin and main body of the resin molded product, and the operator is highly skilled. In addition, if the skin and body of the resin molded product are cut in this way, painting after surface treatment with sandpaper etc. cannot be completed completely.
This method has the disadvantage that the resulting product has poor appearance.

Furthermore, as described in Japanese Utility Model Application Publication No. 63-264309, if a robot is operated to continuously hit the burrs with the trowel 9, it is possible to efficiently remove burrs one by one. However, since a sophisticated control mechanism is required to accurately control the temperature of the trowel 9 and the moving speed of the trowel 9, the overall equipment cost including the control mechanism increases, and the cost of the product increases. This has the problem of causing an increase in the size of the image.

Therefore, the present invention solves the problems of the conventional burr treatment structure for resin molded products, and provides a treatment method that allows the burrs to be efficiently treated by simple means and that also provides a good appearance. The purpose is to provide structure.

Means for Solving the Problems In order to achieve the above object, the present invention provides a resin molded product that is injection molded using a plurality of molds, the molded product in a region along the dividing portion of the mold. A relatively thick burr-like protrusion is formed on the surface of the resin molded product integrally with a predetermined length, and the burr-like protrusion is bent toward the surface of the resin molded product, and This is a burr treatment structure for a resin molded product that is bonded onto a resin molded product.

According to the burr processing structure according to the present invention, burr-like protrusions are continuously formed on the resin molded product along the dividing portions of the mold, and then the burr-like protrusions are directed toward the surface of the resin molded product. The deforming process is completed by bending the resin molded product and fixing it integrally to the surface of the resin molded product using an adhesive. Therefore, burrs will not protrude from the surface of the resin molded product after assembly.
Moreover, since the thickness of this burr-like protrusion is larger than that of a normal burr, it has a large bending strength, so even if it is bent toward the resin molded product as described above, it will not bend. One effect is that the shaped protrusions are not broken or missing, and the appearance is improved.

EXAMPLE Hereinafter, an example of a burr treatment structure for a resin molded product according to the present invention will be described in detail, with the same reference numerals attached to the same components as in the conventional structure.

Reference numeral 1 shown in FIG. 122 is a resin molded product such as an air spoiler, and a burr-like protrusion 11 that projects outward from the resin molded product 1 is previously formed on the tip 1a of this resin molded product 1. has been done.

This burr-like protrusion 11 is continuously protruded on the resin molded product l while maintaining a relatively large wall thickness.

In the illustrated example, the thickness α of the burr-like protrusion 11 is 0.6 mm to
0.8 m-, and this thickness α is the same as the normal burr 2 mentioned above.
, 3.4 (Fig. 5) has a thickness of 0.2 mm to 0.4 mm.
It maintains a thickness that is two to four times that of the previous one.

The burr-like protrusions 11 are actively formed on the resin molded product l using a molding die 15 shown in FIG. 4, as will be described later.

On the other hand, 7 is a member to be attached, such as a vehicle body panel, and the resin molded product 1 is fixed to the member to be attached 7 using a connector (not shown). Note that under the conditions shown in Fig. 1, the resin molded product 1
is not fixed on the attached member 7, and the reference numeral 7 simply indicates the position of the attached member 7.

After forming the burr pattern 11 on the resin molded product 1 in this manner, a coating treatment is applied to impart a desired color to the surface of the resin molded product 1 including the burr pattern 11, and the paint is removed. After drying, move on to the next step.

Next, as shown in FIG. 2, the burr material 11 that has been painted is brought into contact with the member 7 to be installed in the direction of the arrow, that is, below the resin molded product 1 and which will be placed in the next step. Then, the burr pattern 11 is integrally fixed to the surface of the resin molded product 1 using an adhesive 12. As the adhesive 12, it is appropriate to use a rubber-based or urethane-based (two-component type) adhesive.

Next, by connecting the resin molded product 1 to the attached member 7 using a connecting tool not shown, the assembly of the resin molded product 1 to the attached member 7 is completed as shown in FIG. .

Therefore, after assembly, the resin molded product 1 is in a state where the flash material 11 is sandwiched between the resin molded product 1 and the attached member 7, and the presence of the flash material 11 is not visible from the outside. It's hidden.

As mentioned above, the thickness α of the burr law article 11 is 0.6.
@a ~ 0.8mg+, which is 2 to 4 times thicker than a normal burr, has high bending strength, and therefore, as mentioned above, resin molded products. l
Even if it is bent to the side, there is no risk of the burr law document 11 being broken or missing.

FIG. 4 shows an example of the structure of a molding die 15 for forming the burr pattern 11 on the tip 1a of a resin molded product 1, and 16 in the figure is an upper base; An upper die 17 is supported on the upper base 16.

18 is a lower base, and the lower base 18 has a lower mold 19.
．． 20 is supported. A cavity 22 that maintains a shape corresponding to the shape of the resin molded product 1 is formed between the upper mold 17 and the lower molds 19 and 20. The upper mold 17 is movable in the illustrated Y direction, that is, the vertical direction, and the lower mold 19 is slidable in the X direction along the lower base 18, and the lower mold 20 is similarly slidable in the X direction. It is configured.

Therefore, a parting line L is formed between the upper mold 17 and the lower mold 19 along the dividing part of the mold, and a similar parting line L is formed between the upper mold 17 and the lower mold 20. A line L is formed, and a parting line L is also formed between the lower mold 19 and the lower mold 20 along the dividing part.

Reference numeral 24 denotes a resin passage formed at an appropriate location within the lower mold 19, and this resin passage 20 and the cavity 22 are communicated through a supply port 25.

On the other hand, the cavity 22 has an elongated cavity portion 2 extending from the boundary between the cavity 22 and the parting line L by a predetermined length Q along the parting line L.
7 is attached.

In other words, the cavity 27 is formed in the upper mold 17 and the lower mold 20 in advance.
It is processed to form.

According to such a structure of the molding die 15, the upper die 17. The lower mold 19, 20 and the core materials 5, 6 are set in the illustrated state, and the molten resin material is injected into the cavity 22 through the resin passage 24 and the supply port 25, so that a predetermined amount of material is formed in the cavity 22. A shaped resin molded article l is molded. At the same time, the molten resin flows from the boundary of the cavity 22 to the parting line L.

Since the resin material also enters the elongated cavity 27 extending along the upper mold 17. When the lower molds 19 and 20 are moved and the resin molded product l is taken out,
The resin material that has entered the cavity 27 forms the burr artifact 11 (FIG. 1).

In the thus obtained resin molded product 1, burrs 11 are actively formed along the dividing portions of the mold. By processing based on (Figures 1 and 2),
A stream treatment structure according to the present invention is obtained.

When molding conventional resin molded products, it is common for burrs to inevitably occur in areas corresponding to the dividing parts of the mold, but in the case of the present invention, such burrs are generated when molding resin molded products. It is characterized in that the burr is actively formed as a burr-like protrusion 11, and then this burr-like protrusion 11 is bent toward the resin molded product 1 side and bonded.

In the above embodiment, the elongated cavity 27 for forming the burr-like protrusion 11 is formed in a region extending from the boundary of the cavity 22 along the parting line L, but it can be changed as needed. Other parting line L1. Such an elongated cavity 27 may be formed in Ls.

More preferably, the obtained resin molded product 1 is attached to a member 7 to be attached.
When assembled, the bent burr-like protrusion 11 is sandwiched between the resin molded product 1 and the attached member 7, and the existence of the burr-like protrusion 11 is hidden from the outside. Preferably.

Effects of the Invention As explained in detail above, according to the burr treatment structure for a resin molded product according to the present invention, a relatively thick wall is formed integrally with the resin molded product on the surface of the molded product at a portion along the dividing portion of the mold. A large burr-like protrusion is formed with a predetermined length, the burr-like protrusion is bent toward the surface of the resin molded product, and is bonded onto the resin molded product. The effects described below are brought about.

In other words, the burr process can be completed simply by bending the burr-like protrusions formed along the dividing part of the mold toward the surface of the resin molded product and fixing it in the negative direction. There is no need to use a cutter or trowel as in the past, and the operation is extremely simplified, and even non-skilled workers can produce I# resin molded products with a good appearance.

The above-mentioned burr-like protrusion has a large thickness compared to the thickness of a normal burr, so it has a large bending strength. There is no risk of it breaking or missing.

Furthermore, since conventionally known mechanisms such as robots and sophisticated control mechanisms for driving the robots are completely unnecessary, the overall equipment cost is lowered and the product cost is reduced. Demonstrate.

[Brief explanation of drawings]

Fig. 1, Fig. 2, and Fig. 3 are schematic diagrams showing process examples for performing flash treatment on resin molded products based on the present invention, and Fig. 4 is a structural example of a mold for molding adopted in the present invention. Fig. 5 is an external view showing an example of a resin molded product, Fig. 6 is a sectional view taken along the line Vl-Vl in Fig. 5, and Fig. 7 shows an example of conventional burr treatment. It is a schematic diagram. l... Resin molded product, 5, 6... Core material, 7... Attached member, ll... Burr-shaped protrusion, 12... Adhesive,
I5...Forming mold, I7...Upper mold, 19.20.
...lower mold, 22...cavity, 24...resin passage, 25...supply port, 27...cavity, Mold 5 for Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 8

Claims (1)

[Claims] (1) A resin molded product that is injection molded using multiple molds, where the surface of the molded product along the dividing portion of the mold has a relatively large wall thickness integrated with the resin molded product. A resin molding characterized in that a burr-like protrusion is formed with a predetermined length, the burr-like protrusion is bent toward the surface of the resin molded product, and is bonded onto the resin molded product. Product burr treatment structure.