KR101167703B1 - Manufacturing Apparatus and Method of Steering Wheel - Google Patents

Abstract

The present invention relates to an apparatus and a method for manufacturing a foam resin steering wheel.

The manufacturing apparatus of the present invention, the lower mold is formed with a lower cavity into which the lower portion of the core is inserted; An upper mold having an upper cavity corresponding to the lower cavity and configured to insert an upper portion of the core; Raw material injection means for injecting the foamed resin raw material into the core insertion space formed by the lower cavity and the upper cavity in contact; And a heat source supply means for foaming the injected foamed resin raw material, wherein the upper mold has an upper surface forming movable body which can be moved up and down while forming an upper surface of the upper cavity, and corresponds to an upper forming body. It has a base body is formed with the insertion hole, the upper surface forming movable body is to move up and down separately from the movement of the core to be inserted.

By using the device of the present invention, the steering of the hardness is uniform even under the condition that the foamed resin is not located at an even thickness on the outer side of the core, or the condition where the foamed resin is covered with a lot and less when viewed as a whole of the steering wheel. The wheels can be obtained, and the defect rate is low.

Wheel, steering wheel, foamed resin, manufacturing

Description

Manufacturing Apparatus and Method for Manufacturing Steering Wheel of Foamed Resin Material {Manufacturing Apparatus and Method of Steering Wheel}

The present invention relates to an apparatus and a method for manufacturing a foamed resin steering wheel with foamed resin on the outside of the core.

In general, the steering wheel of the vehicle, at the same time serves as a steering device for controlling the direction of driving the vehicle and as a safety device to protect the passengers in the event of an accident.

Such a steering wheel is an interior material component, in which a touch quality problem is also important, such as a good touch and aesthetic feeling when the driver grips it by hand.

In manufacturing a steering wheel, the reaction injection molding method was used in the past, and a polyurethane material was used as the material.

However, in the manufacture of steering wheels using polyurethane, not only environmental problems at work places but also workers' safety accidents were pointed out.

Due to the above problems, a method of manufacturing a steering wheel using a foamed polypropylene without using a polyurethane has been devised, but it is difficult to manufacture a molded foamed polypropylene steering wheel integrally and is usually manufactured by dividing it into an upper part and a lower part. It was integrated using a separate adhesive or the like.

In this case, since a separate bonding process is required, a problem of an increase in manufacturing time and cost has been pointed out.

In addition, in manufacturing a polypropylene steering wheel, the polypropylene is surrounded by the outer circumferential surface of the core. The rim of the core is generally formed of a concave portion and a convex portion, so that the expanded polypropylene solids are uniformly concave and convex on the rim. There was a problem that it was difficult to locate.

For this reason, there is a problem that the foamed polypropylene steering wheel, which is a finished product, is produced unevenly.

Another problem with the conventional manufacturing method of the foamed steering wheel is that when a mold is released from the mold after molding, a separate apparatus or a process for smoothing the mold is additionally required, thereby causing a problem in that the manufacturing cost increases.

As a technique for solving such a problem, Korean Patent Registration No. 10-0899682 (Application No. 10-2008-0133601), which is another patent application technology of the applicant.

By the way, the prior art as described above is a condition that the foamed resin is not located at an even thickness on the outside of the core, that is, the foamed resin is thickly coated on one side (lower) around the core as shown in FIG. There was a problem in that the defective rate was high in the condition of being covered, the condition of having a lot of foamed resin and a portion of the foamed resin as seen in the entire foam steering wheel.

In particular, there was a problem that a large difference in the surface hardness of the steering wheel is a finished product.

Another problem of the prior art is that the raw material supply line is provided to disperse the raw material to various points of the core, and the mold structure is not only complicated, but also the defective rate of the product is high.

The present invention is intended to solve the above problems, more specifically, the condition that the foamed resin is not located in an even thickness on the outer side of the core or the steering wheel as a whole when viewed as a whole, the foamed resin is covered with a lot and less covered part It is an object of the present invention to provide a steering wheel manufacturing method and a manufacturing method for the foamed resin material steering wheel having a low hardness rate can be obtained even under the conditions and the like.

The method for manufacturing a foam resin steering wheel according to the present invention has a core insertion step of inserting a lower portion of a core forming a skeleton of a steering wheel into a lower cavity of a lower mold.

In addition, the upper mold having an upper cavity corresponding to the lower cavity and formed so that the upper part of the core is coupled to the upper part of the lower mold, but has a mold coupling step of coupling the upper part of the core to be inserted into the upper cavity.

In addition, there is a raw material injection step of injecting the foam resin raw material into the core insertion space formed by the lower cavity and the upper cavity in contact by the mold bonding step.

In addition, it has a foaming step of foaming by applying heat to the foamed resin raw material injected through the raw material injection step.

In addition, the upper mold has an upper surface forming movable body which can move up and down while forming the upper surface of the upper cavity, and has a base body having a movable body insertion hole formed corresponding to the upper surface forming movable body so that the upper surface forming movable body moves up and down. Between the coupling step and the heat source supplying step, the upper surface forming member is moved to the upper side separately from the movement of the core, and after the foaming step, the upper surface forming member is moved to the lower side to pressurize the foamed foamed resin to expand the foamed resin outside the core. Manufactures a steering wheel wrapped.

Through the above configuration, the steering wheel is uniform in hardness even under conditions in which the foamed resin is not positioned at an even thickness on the outside of the core or in which the foamed resin is covered with a lot and less when viewed as a whole. To obtain a low defect rate.

The steering wheel manufacturing apparatus for the manufacturing method as described above has a lower mold having a lower cavity into which a lower portion of a core forming a skeleton of the steering wheel is inserted.

It also has an upper mold having an upper cavity corresponding to the lower cavity and formed so that the upper portion of the core is inserted.

Further, it has a raw material injection means for injecting the foamed resin raw material into the core insertion space formed by the lower cavity and the upper cavity in contact.

It also has a heat source supply means capable of supplying a heat source for foaming the foamed resin raw material injected through the raw material injection means.

In addition, the upper mold has an upper surface forming movable body which can move up and down while forming the upper surface of the upper cavity, and has a base body having a movable body insertion hole formed corresponding to the upper surface forming movable body so that the upper surface forming movable body moves up and down.

In addition, the upper surface forming movable body is to move up and down separately from the movement of the inserted core.

In the method of manufacturing the foamed resin steering wheel of the present invention, the upper surface forming movable body is moved to the upper side separately from the movement of the core between the mold coupling step and the heat source supplying step, and the upper surface forming movable body is moved to the lower side after the foaming step. It is to manufacture the steering wheel wrapped with foamed resin on the outer side of the core by pressurizing the foamed resin so that the foamed resin is not placed at an even thickness on the outer side of the core or the part that is covered with a lot of foamed resin as the whole of the steering wheel. It is possible to obtain a steering wheel with a uniform hardness even under a condition in which there is a part to be covered, and has a feature of low failure rate.

In addition, the foamed resin material steering wheel manufacturing apparatus of the present invention, it is possible to produce a steering wheel of uniform hardness, it is possible to lower the defective rate, there is a feature that can produce a high-quality foamed resin material steering wheel.

Hereinafter, the technical idea of the present invention will be described more specifically with reference to the accompanying drawings.

It is to be understood, however, that the appended drawings illustrate only typical embodiments of the present invention and are not to be considered as limiting the scope of the invention.

The foamed resin material steering wheel manufacturing apparatus of the present invention is a core that forms the skeleton of the steering wheel as in the prior art (Korean Patent Registration No. 10-0899682 (Application No. 10-2008-0133601), which is the prior art of the applicant) 3) has a lower mold 10 in which a lower cavity 11 into which the lower part of the insert is inserted is formed.

It also has an upper mold 20 having an upper cavity 21 corresponding to the lower cavity 11 and formed so that the upper portion of the core 3 is inserted.

In addition, the lower cavity 11 and the upper cavity 21 has a raw material injection means 40 for injecting the foamed resin raw material into the core insertion space 30 formed.

In addition, it has a heat source supply means 50 that can supply a heat source for foaming the foamed resin raw material injected through the raw material injection means (40).

By the way, the present invention, unlike the prior art, the hardness of the foam resin on the outside of the core (3) or the condition that the foam resin is covered with a large portion and less covered when viewed as a whole steering wheel It is possible to obtain a uniform steering wheel and to lower a defective rate.

To this end, the steering wheel manufacturing apparatus of the present invention, the upper mold 20 has an upper surface of the upper cavity 21 has a top surface forming movable body 22 that can be moved up and down, the upper surface forming movable body 22 is The base body 23 has a movable body insertion hole 23a formed to correspond to the upper surface forming movable body 22 to move downward.

In addition, the upper surface forming movable body 22 is implemented to move up and down separately from the movement of the inserted core.

Hereinafter, in describing the present invention in detail, a description of technical ideas that are not the same as or important to the related art will be omitted.

However, in the understanding of the configuration of the present invention, the part determined to be necessary will be described again even if it is the same as the prior art.

Of course, the characteristic components of the present invention will be described in detail.

1 is a perspective view of a core inserted between a lower mold and an upper mold.

As shown in FIG. 1, the core 3 consists of a circular rim 3a, a central hub 3b, and a plurality of spokes 3c connecting the rim 3a to the central hub 3b.

In the case of the rim (3a), most of the cross-sectional shape is made of "대부분" type, which is intended to be integrated with the rim (3a) without being flown when the foamed resin is overmolded outside the rim (3a) .

The core 3 is formed of a light metal or plastic material to reduce the weight of the product

It is preferable.

Figure 2 is a perspective view of the lower mold used in the present invention, Figure 3 is a partially cut perspective view of the lower mold shown in Figure 2, Figure 4 is a perspective view of the upper mold, Figure 5 is a top mold of Figure 4 Partially cut perspective view.

2 to 5, it can be seen that the lower cavity 11 and the upper cavity 21 are coupled to each other to form a core insertion space 30 that can accommodate the core 3.

The lower mold 10 may be implemented in a form including a lower plug 12 that can move the core 3 accommodated in the core insertion space 30 up and down.

The lower plug 12 allows the core 3 accommodated in the core insertion space 30 to be moved up and down. The lower plug 12 contacts the lower portion of the core 3 to push up or lower the core 3. Can be implemented as:

Preferably it is implemented to abut the lower portion of the central hub (3b) of the core 3 to push up or down the core (3).

To this end, the lower plug 12 is movable separately from the lower mold 10 at a position corresponding to the lower surface of the lower mold 10, preferably the lower surface of the central hub 3b. It can be implemented as a structure.

For example, the hollow 14 is formed at the center of the lower mold 10, and the lower plug 12 having a cylindrical or square pillar shape is inserted into the hollow 14 so that the lower mold 10 is formed by a hydraulic cylinder or a pneumatic cylinder. Separately, it can be implemented in a structure that can be moved.

In this case, the lower plug 12 in contact with the lower portion of the core 3 moves up and down, and thus the core 3 also moves up and down.

The lower cavity 11 in the present invention is a portion recessed in a shape corresponding to the lower end of the core 3 to accommodate the lower portion of the core 3 on the upper surface of the lower mold 10, the upper mold 20 Combined with the upper cavity 21 of the) to form a core insertion space 30 that can accommodate the core (3).

The core insertion space 30 is a form in which a space is formed between the inner wall of the core insertion space 30 and the core 3 even when the core 3 is inserted, and the foamed resin is filled in the space.

The upper mold 20, which is a component of the present invention, has a shape in which an upper cavity 21 is formed to accommodate the upper end of the core 3.

When the upper mold 20 and the lower mold 10 are in contact with each other, no gap is generated around the core insertion space 30 so that the surface of the molded foam resin steering wheel is clean.

The raw material injection means 40, which is a component of the present invention, is a foamed resin (foamed polypropylene, expanded polystyrene, expanded polyethylene,) in the core insertion space 30 formed by combining the lower cavity 11 and the upper cavity 21 with each other. It is the part to inject raw material of foamed polyurethane etc.).

Through one surface of the lower cavity 11 or the upper cavity 21 is implemented in a structure to inject the foam resin raw material contained in the raw material tank (not shown).

Preferably, a plurality of through holes 41, shown in FIG. 6, on the lower surface of the lower cavity 11 of the lower mold 10, in particular on the lower surface of the portion where the rim 3a and the spoke 3c of the core 3 meet. As shown in FIG. 6, the through hole 41 and the raw material tank (not shown) may be connected to each other.

In addition, the injection hole stopper 42 having a cylindrical to square column shape is formed to move up and down along the through hole 41 in the through hole 41, so that the injection part stopper 42 moves downward (㉮ direction). When the through hole 41 is opened, the foamed resin raw material in the raw material tank (not shown) may be injected into the core insertion space 30 through the through hole 41, and the injection part plug 42 is moved upward. When the movement (㉯ direction) to be integral with the lower surface of the lower cavity 11 is closed the through hole 111, as well as the upper surface of the injection portion plug 42 forms a part of the lower surface of the lower cavity (11). It can be formed into a structure.

In this case, as the foamed resin raw material injected through the raw material injection means 40, a foamed resin solid formed of small grains may be used.

The above structure alone does not solve the problems of the prior art, that is, the structure of the mold is complicated and the defect rate of the product is increased.

The inventors of the present application as a method for solving the above problems, the raw material injection means 40 is injected into the central portion of the lower cavity 11 through a single path to the core resin inserting space (30) A structure having a raw material supply line 43 for dispersing and injecting the rim 3a and the spoke 3c of the positioned core 3 into each connection point is shown (see FIG. 11).

That is, the foamed resin raw material supplied through one supply line is distributed and supplied to the plurality of lines in the lower mold.

According to this structure, since the core is supplied to the core insertion space at a uniform speed, the defective rate of the molded product is low, and the mold structure has a relatively simple feature.

The heat source supply means 50, which is a component of the present invention, supplies a heat source to the core insertion space 30 to foam the foamed resin material injected into the core insertion space 30 through the raw material injection means 40. Means.

The heat source supply means 50 may be implemented in a structure for supplying a heat source sufficient to foam the foamed resin raw material injected into the core insertion space 30 through one surface of the lower cavity 11 or the upper cavity 21. .

Preferably, a plurality of small holes are formed in the side surface of the lower cavity 11 or the upper cavity 21, and high temperature steam or the like may be ejected through the holes.

In addition to the high-temperature steam through the heat source supply means 50 may be formed to inject cooling water and air, in this case it is possible to prevent the deformation of the foamed foam foamed in the core insertion space 30 as well as the molded article There is a feature that can be performed smoothly.

The manufacturing apparatus of the present invention can be implemented in the form having a lower stopper 13 which is movable in conjunction with the up and down movement of the core 3 at one end of the lower cavity 11.

In addition, the upper mold 20 may be implemented in the form having an upper stopper 24 movable in conjunction with the up and down movement of the core 3 at one end of the upper cavity 21.

The lower stopper 13 and the upper stopper 24 may foam the foamed foamed resin overmolded to the core 3 at one end of the lower cavity 11 or the upper cavity 21 only to a predetermined predetermined position. This part serves as a barrier to block raw materials.

In general, it can be formed so as to block the foamed resin raw material in the middle portion of the spoke (3c) so that only a portion of the rim (3a) and the spoke (3c) of the core 3 is overmolded.

If the structure that can move the core 3 inserted into the core insertion space 30 in the upper and lower sides by using the lower plug 12 is applied to this structure, the lower stopper 13 also has the upper, It should be formed to be able to move up and down in conjunction with the movement down.

As a specific example, there is a structure in which an elastic body (not shown) such as a spring is positioned below the lower stopper 13 to move the lower stopper 13 up and down.

However, only the configuration as described above can not achieve the object of the present invention.

For this reason, in the present invention, in forming the upper mold 20, having an upper surface of the upper cavity 21, the upper and lower movable members 22, which can move up and down, the upper forming member 22 is moved up and down The base body 23 is formed to correspond to the upper surface forming movable body 22 so that the movable body insertion hole 23a is formed.

In addition, the upper surface forming member 22 is moved up and down independently of the movement of the core into which the upper surface forming member 22 is inserted, and the upper surface forming member 22 is moved upward, and the upper surface forming member 22 is moved downward and foamed. It is possible to pressurize the foamed resin in the state.

In other words, the foamed resin foamed by the upper surface forming member 22 is pressed, so that the foamed resin has a uniform density, and the molding is completed in such a state so that a foamed resin steering wheel having an even hardness can be obtained. .

In addition, the core insertion space 30 is to be filled with a foamed resin without empty space to prevent the failure occurs.

In the apparatus of the present invention as described above, no gap is generated between the movable body insertion hole 23a and the upper surface forming movable body 22 of the base body 23, and the injected foamed resin raw material is injected into the movable body insertion hole 23a. It is preferable that the upper surface forming member 22 does not flow in between.

According to such a structure, a foamed resin steering wheel with a clear surface can be obtained.

However, when the upper surface forming movable body 22 is lowered to the maximum, no gap is generated between the movable body inserting hole 23a and the upper surface forming movable body 22 so that the injected foam resin raw material is inserted into the movable body inserting hole 23a and the upper surface forming. Although it does not flow between the moving body 22, when the upper surface forming movable body 22 rises, a gap may be generated between the movable body insertion hole 23a and the upper surface forming movable body 22.

That is, the movable body insertion hole 23a of the base body 23 has an inclined portion 23b whose diameter gradually narrows toward the lower mold,

The lower portion of the upper surface forming movable body 22 has an inclined portion 22b formed corresponding to the inclined portion 23b of the movable body inserting hole 23a, thereby between the movable body inserting hole 23a and the upper surface forming movable body 22. It is to be implemented so that there is no gap.

Foamed resin material steering wheel manufacturing method of the present invention using the above device, has a core insertion step of inserting the lower portion of the core forming the skeleton of the steering wheel in the lower cavity of the lower mold.

In addition, an upper mold having an upper cavity corresponding to the lower cavity and having a gap formed in the contact surface when contacting the lower cavity and formed so that the upper portion of the core is inserted is coupled to the upper portion of the lower mold, but the upper portion of the core is inserted into the upper cavity. It has a mold bonding step of bonding as possible.

In addition, there is a raw material injection step of injecting the foam resin raw material into the core insertion space 30 formed by the lower cavity and the upper cavity in contact by the mold bonding step.

In addition, it has a foaming step of foaming by applying heat to the foamed resin raw material injected through the raw material injection step.

In addition, the upper surface forming movable body 22 is moved to the upper part separately from the movement of the core between the mold bonding step and the heat source supplying step, and the foamed resin foamed by moving the upper surface forming movable body 22 to the lower part after the foaming step. Pressurize.

Through this, it is possible to manufacture a steering wheel wrapped with a foamed resin on the outside of the core 3 as shown in FIG.

In the present invention, as shown in FIG. 12, the lower cavity 11 has a portion for forming the core insertion space 30 and a portion extending outwardly thereof, and among the lower cavity 11 of the core insertion space 30. It may be implemented so that the air outlet 15 is formed in the portion extended to the outside.

In such a structure, it is preferable to implement the core 3 when the upper surface forming carrier 22 is lowered after the foaming material is filled in the lower cavity 11.

Since the core 3 is lowered, which is also applied to the related art, a detailed description thereof will be omitted.

According to such a structure, manufacture of a foamed resin steering wheel which has a complicated shape design is possible.

In the present invention, the upper and lower movement of the upper surface forming member 22 may be implemented by a manual method made by a manual, or may be implemented by a power usage method which is moved by a hydraulic cylinder or a pneumatic cylinder.

Of course, the preferred method is power usage.

1 is a perspective view of a core inserted between a lower mold and an upper mold

2 is a perspective view of a lower mold that is a component of the present invention;

3 is a partially cutaway perspective view of the lower mold shown in FIG.

4 is a perspective view of an upper mold that is a component of the present invention;

5 is a partially cutaway perspective view of the upper mold shown in FIG.

6 is a schematic diagram illustrating a state in which the upper mold and the lower mold are coupled and the upper surface forming movable body is moved upwards;

FIG. 7 is a schematic view showing a state in which the upper surface forming movable body is lowered in the state of FIG. 6; FIG.

8 is a perspective view of a foamed resin steering wheel produced by the manufacturing apparatus and manufacturing method of the present invention

Figure 9 is a schematic diagram for explaining that the gap between the movable body insertion hole and the upper surface forming movable body of the base body does not enter the foam resin raw material is not introduced between the movable body insertion hole and the upper surface forming movable body

10 is a schematic diagram illustrating a structure in which the movable body insertion hole of the base body has an inclined portion that gradually decreases in diameter toward the lower mold, and the lower portion of the upper surface forming movable body has an inclined portion formed corresponding to the inclined portion of the movable body insertion hole.

A: state where the surface forming carrier is moved upward

B: the upper surface forming carrier is moved downward

11 is a view illustrating a structure having a raw material supply line for dispersing and injecting the foamed resin raw material into the center portion of the lower cavity through one path and then dispersing and injecting each of the connection points of the rim and the spoke of the core located in the core insertion space; schematic

12 is a schematic view for explaining the structure of a lower cavity having an air outlet

Figure 13 is a schematic view for explaining the structure of the lower cavity and another upper mold having an air outlet

<Explanation of symbols for main parts of drawing>

3. Core 3a. Rim

3b. Hub 3c. Spoke

10. Lower mold 11. Lower cavity

12. Lower plug 13. Lower stopper

14. Hollow 15. Air outlet

20. Upper mold

21. Upper cavity 22. Top forming carrier

22b. Slope 23. Base Body

23a. Moving body insertion hole 23b. Slope

24. Upper stopper 30. Core insertion space

40. Raw material injection means 41. Through-holes

42. Injection part plug 43. Raw material supply line

50. Heat source supply means

Claims (9)

In the apparatus for manufacturing a steering wheel made of foam resin, A lower mold 10 having a lower cavity 11 into which a lower portion of the core 3 constituting the skeleton of the steering wheel is inserted; An upper mold 20 corresponding to the lower cavity 11 and having an upper cavity 21 formed so that an upper portion of the core 3 is inserted; Raw material injection means 40 for injecting the foamed resin raw material into the core insertion space 30 formed by the lower cavity 11 and the upper cavity 21 in contact; And It comprises a; heat source supply means 50 for supplying a heat source for foaming the foamed resin raw material injected through the raw material injection means 40, the upper mold 20 of the upper cavity 21 A base body having an upper surface forming movable body 22 capable of moving up and down while forming an upper surface, and having a movable body insertion hole 23a formed corresponding to the upper surface forming movable body 22 so that the upper surface forming movable body 22 moves up and down. (23), wherein the upper surface forming movable member 22 is to move up and down separately from the movement of the core (3) to be inserted, the manufacturing apparatus of the foamed resin material steering wheel. The method of claim 1, Since no gap is generated between the movable body insertion hole 23a and the upper surface forming movable body 22 of the base body 23, the injected foamed resin raw material flows in between the movable body inserting hole 23a and the upper surface forming movable body 22. It is characterized in that, the manufacturing apparatus of the foam resin steering wheel. The method of claim 1, The movable body insertion hole 23a of the base body 23 has an inclined portion 23b, the diameter of which is gradually narrowed toward the lower mold 10, The lower portion of the upper surface forming movable body 22 has an inclined portion 22b formed corresponding to the inclined portion 23b of the movable body inserting hole 23a, thereby between the movable body inserting hole 23a and the upper surface forming movable body 22. Apparatus for producing a foamed resin steering wheel, characterized in that can be in close contact without a gap. 4. The method according to any one of claims 1 to 3, The raw material injection means 40 is injected into the central portion of the lower cavity 10 through one path, and then the rim 3a and the spoke 3c of the core 3 located in the core insertion space 30. It characterized in that it has a raw material supply line (43) to be dispersed and injected into each connection point of), the manufacturing apparatus of the foam resin steering wheel. 4. The method according to any one of claims 1 to 3, The lower cavity 11 has a portion for forming the core insertion space 30 and a portion extending outwardly thereof, Air outlet (15) is formed in the portion extending outward of the core insertion space 30 of the lower cavity (11), the manufacturing apparatus of the foam resin steering wheel. In the method for manufacturing a steering wheel made of foam resin, A core insertion step of inserting a lower portion of the core 3 constituting the skeleton of the steering wheel into the lower cavity 11 of the lower mold 10; The upper mold 20 having the upper cavity 21 corresponding to the lower cavity 11 and formed so that the upper portion of the core is inserted is coupled to the upper portion of the lower mold 10, but the core 3 is attached to the upper cavity 21. A mold coupling step of coupling the upper portion of the mold to be inserted; A raw material injection step of injecting a foaming resin raw material into the core inserting space 30 formed by contacting the lower cavity 11 and the upper cavity 21 by the mold bonding step; And Consists of including; foaming step of applying foam to the foamed resin raw material injected through the raw material injection step to foam The upper mold 20 corresponds to the upper surface forming member 22 such that the upper surface forming member 22 and the upper surface forming member 22 capable of moving up and down while forming the upper surface of the upper cavity 21 are moved up and down. And having a base body 23 having a movable body insertion hole 23a formed therebetween, so that the upper surface forming movable body 22 is moved upwardly apart from the movement of the core 3 between the mold coupling step and the heat source supplying step. After the foaming step, the upper surface forming member 22 is moved downward to pressurize the foamed foamed resin to manufacture a steering wheel in which the foamed resin is wrapped on the outside of the core 3. Way. The method according to claim 6, The raw material injection step allows the foamed resin raw material to be injected into the center portion of the lower cavity 11 through a single path, and the rim of the core 3 in which the injected foamed resin raw material is located in the core insertion space 30 ( 3a) and a method of manufacturing a foamed resin steering wheel, characterized in that the injection is distributed to each connection point of the spoke (3c). The method according to claim 6 or 7, The foamed resin raw material is foamed polypropylene, foamed polystyrene, foamed polyethylene, characterized in that any one of the foamed polyurethane, the method of manufacturing a foamed resin material steering wheel. delete

Images