JPH1177821A - Bending working apparatus for resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To work a resin molding of pipe shape by bending by thermally softening the resin molding without marring its appearance. SOLUTION: This bending working apparatus for a resin molding is equipped with an upper chuck 9 and lower chuck 8 for retaining a part other than a part to be worked by bending, of a pipe part 2. In addition, an air heater 11 with an air nozzle 15 to be inserted into the bore of the pipe part 2 by an air heater drive actuator 12 is arranged on the tip side of the pipe part 2 retained by both chucks 9, 8. Further, a hot blast is ejected from the bore side of an air ejection hole 17 in the air nozzle 15 to heat the part to be worked by bending 25. Besides, a bending member 22 which pushes up an area near the part to be worked by bending 25 is provided in such a way that the bending member 22 is vertically movable by a drive actuator 20 for the bending member 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for bending a resin molded product.

[0002]

2. Description of the Related Art Generally, in order to form a pipe material by injection molding, a pin-shaped punching die is used to form a bore of the pipe. However, when forming a bent pipe material, it becomes very difficult to extract a pin-shaped die that forms an inner cavity, so that the structure of the die becomes very complicated and productivity decreases. Would.

Further, a molding method called double molding in which two resin molded parts formed separately in advance are joined at a position corresponding to a bent portion also causes low productivity and high cost.

Therefore, when a bent pipe-shaped resin molded product is required, a straight pipe-shaped product is molded at the time of injection molding, and the pipe-shaped product is separately bent in a later step. There is a need.

Japanese Patent Publication No. 5-52256 discloses a technique for heating the pipe-shaped injection-molded article later and performing bending using an external force.
Shown in In this prior art, a resin body case used for a general glasses-type hearing aid is subjected to a bending process, and a resin body case 51 is provided with a cradle 52 and a resin body case 5.
It is held by a holding block 53 having a concave shape 53a along the shape of (1). The holding block 53 is provided so as to be able to move up and down while being guided by guide pins 54 embedded in the receiving table 52. Further, hot air generators 56 and 57 capable of heating the vicinity of the bent portion 55 of the resin body case 51 held by the receiving table 52 and the holding block 53 from the upper surface and the lower surface are provided, and the bending direction of the resin body case 51 is provided. A push plate 58 movable in the direction of arrow A is installed.

Next, the bending process using the above-mentioned bending apparatus will be described. First, the resin body case 51
After positioning and mounting, the pressing block 53 is pressed downward (in the direction of arrow B) to hold and fix the resin body case 51 so as not to move.

Next, hot air is blown from the upper surface and the lower surface of the vicinity of the bent portion 55 of the resin main body case 51 by the hot air generators 56 and 57 to soften the heated body to a temperature higher than the heat deformation temperature. Is pressed in the vicinity of the bent portion 55 of the resin main body case 51 while operating in the direction of the arrow A, thereby bending the resin main body case 51 along the corner 52 a of the receiving stand 52.

Then, the pressing plate 58 is kept in this state and cooled, whereby the bent portion 55 of the resin body case 51 is hardened, and the bending process is completed.

[0009]

However, in the above bending apparatus, it is difficult to control the flow rate, the primary pressure, the flow rate, the air temperature or the room temperature of the hot air generated by the hot air generators 56 and 57. Resin body case 51
When the hot air is blown from the surface to heat and soften the resin main body case 51, there is a problem that excessive heating easily causes an appearance defect such as melting in the resin main body case 51. .

The present invention has been made in view of the above-mentioned problems of the prior art, and can heat and soften a resin molded product without impairing the appearance of the resin molded product, and can perform bending of a resin molded product having a pipe shape. It is an object of the present invention to provide an apparatus for bending a resin molded product.

[0011]

In order to achieve the above object, a resin-molded product bending apparatus according to a first aspect of the present invention has a holding device for holding a portion other than a portion on which a resin-molded product having an inner cavity is subjected to bending. Means, a heating means for heating the portion of the resin molded product to be bent from the lumen side, and a bending means for bending the portion of the resin molded product to be bent.

[0012] In a second aspect of the present invention, in the bending apparatus for a resin molded product according to the first invention, the heating means comprises a part for bending the resin molded product. It emits hot air toward.

Further, a bending apparatus for a resin molded product according to the third invention is the bending apparatus for a resin molded product according to the first or second invention, wherein the bending means also serves as the heating means. It is.

In a fourth aspect of the present invention, in the bending apparatus for a resin molded product according to the third invention, the heating means is a cartridge type heater.

That is, the apparatus for bending a resin molded product according to the first invention holds a portion other than the portion where the resin molded product having the inner cavity is bent by the holding means, and performs the bending process on the resin molded product. Is heated by the heating means from the lumen side. A portion of the heated resin molded product to be bent is bent by a bending means.

In the apparatus for bending a resin molded product according to the second aspect of the present invention, a portion to be bent of the resin molded product is heated from the lumen side by the amount of heat released from the heating means.

Further, in the apparatus for bending a resin molded product according to the third aspect of the present invention, a portion to be bent of the resin molded product is heated from the lumen side by a bending means having a heating means. A portion of the heated resin molded product to be bent is bent by a bending means.

In the apparatus for bending a resin molded product according to the fourth aspect of the present invention, a portion to be bent of the resin molded product is heated from the lumen side by a bending means having a cartridge type heater.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an apparatus for bending a resin molded product of the present embodiment, and FIG. 2 is a sectional view showing an air heater provided in the apparatus. 3 and 4 are perspective views for explaining the bending by the present apparatus. FIG. 3 shows a state in which the resin molded product is heated, and FIG. 4 shows a state in which the bending of the resin molded product is completed.

In FIG. 1, a support plate 4 is fixed to a base plate 3 serving as a base in a direction perpendicular to the base plate 3. Further, two guides 5 and 6 are erected along the support plate 4 on the base plate 3. An openable and closable upper chuck 7 and a lower chuck 8 as holding means for holding the pipe-shaped connection pipe 1 as a resin molded product having an inner cavity are disposed opposite to the two guides 5 and 6. ing.

The lower chuck 8 is fixed to the two guides 5 and 6, and the bent portion 25 where the pipe portion 2 of the connection pipe 1 is bent is located outside. The vicinity of 25 is supported from below to position the connecting pipe 1 in the height direction.

On the other hand, the upper chuck 7 is moved vertically (arrows 10 shown in FIG. 1) along two guides 5 and 6 by an upper chuck driving actuator 9 fixed to the support plate 4.
Direction), and presses the connection pipe 1 supported by the lower chuck 8 from above.

A cylindrical air heater 1 is located at a position facing the pipe portion 2 sandwiched between the upper chuck 7 and the lower chuck 8.
1 is disposed at a position where it can be inserted into the lumen of the connection tube 1. The air heater 11 can be moved by the air heater drive actuator 12 in the longitudinal direction of the pipe portion 2, that is, in the axial direction of the pipe portion 2 (the direction of the arrow 14 shown in FIG. 1) along the rail 13 provided on the base plate 3. ing.

At the tip of the air heater 11, an air nozzle 1 having a small outside diameter that can be inserted into the lumen of the pipe portion 2.
5 are installed. As shown in FIG. 2, the air nozzle 15 is provided with a hole 16 in the axial direction (the direction of the arrow 14 shown in FIG. 2) communicating with the inside of the air heater 11. A plurality of air ejection holes 17 communicating with the outer peripheral surface of the air nozzle 15 are provided radially, that is, perpendicular to the axis of the air nozzle 15. With this configuration, the hot air 19 generated in the air heater 11 is discharged from the plurality of air ejection holes 17 through the holes 16 in the air nozzle 15. Here, the air heater 11 and the air nozzle 15 constitute a heating unit.

On the other hand, below the pipe portion 2 sandwiched between the upper chuck 7 and the lower chuck 8, the pipe portion 2, which is vertically movable by a bending member drive actuator 20 fixed on the base plate 3, is provided. Upward (arrow 2 shown in FIG. 1)
A bending member 22 is provided as a bending means for pressing in one direction. Here, the portion where the bending member 22 abuts on the pipe portion 2 is a position where the distance from the reference is farther than the bent portion 25 with reference to the portion sandwiched between the upper chuck 7 and the lower chuck 8. It is in. That is, the portion sandwiched between the upper chuck 7 and the lower chuck 8 and the bending member 2
The bent portion 25 of the pipe portion 2 is positioned between the portion and the portion where the pipe 2 contacts.

Next, the operation of the present embodiment will be described with reference to FIGS. First, after the connecting pipe 1 is placed on the lower chuck 8, the upper chuck 7 is lowered by the upper chuck driving actuator 9, and the connecting pipe 1 is moved to the upper chuck 7 and the lower chuck 8.
Hold and fix with. At this time, the upper chuck 7 and the lower chuck 8 move the bent part 25 of the pipe portion 2 of the connection pipe 1 near the bent part 25 and away from the bent part 25 near the air heater 11. Axial positioning of the pipe portion 2 of the connecting pipe 1 is performed so as to be sandwiched (see FIG. 1).

Next, the air heater 11 is started, and after confirming that the hot air 19 discharged from the air ejection hole 17 has reached a predetermined temperature, the air heater 11 is moved toward the pipe portion 2 by the air heater drive actuator 12. Rail 1
3 and the air nozzle 15 is inserted into the lumen of the pipe 2. At this time, as shown in FIG. 3, the air heater 11 is advanced and positioned to a position where the hot air 19 discharged from the air ejection holes 17 of the air nozzle 15 heats the predetermined bent portion 25.

Then, the hot air 19 emitted from the air nozzle 15 is blown from the inner side of the pipe portion 2 to heat the bent portion 25 for a predetermined time, thereby raising the temperature of the bent portion 25 to the heat deformation temperature. After that, the air heater 11 is retracted by the air heater drive actuator 12, and the air nozzle 15 is extracted from the inner cavity of the pipe portion 2.

Next, as shown in FIG. 4, the bending member 22 is raised by the bending member drive actuator 20 (arrow 21).
), The pipe portion 2 is pushed upward, and the pipe portion 2 is bent. At this time, the pipe part 2 is hot air 1
9, only the predetermined bent portion 25 is heated and softened. Therefore, the portion of the pipe portion 2 pressed by the bending member 22, the upper chuck 7 and the lower chuck 8
Therefore, only the heated and softened bent portion 25 is bent without bending the pinched portion.

The bending member 22 is raised to a predetermined position,
After the bending operation of bending the pipe portion 2 at a predetermined angle is completed, the lifting of the bending member 22 is stopped, and that state is maintained. By performing this holding operation for a predetermined time, the bent state of the pipe portion 2 is maintained, and the heated bent portion 25 is cooled, so that the springback of the bent portion can be suppressed. And the holding of the pipe part 2
After the cooling is performed for a predetermined time, the bending of the connection pipe 1 is completed.

Thereafter, the bending member 22 is lowered by the bending member drive actuator 20. Further, the upper chuck 7 is raised by the upper chuck drive actuator 9 to release the holding of the pipe portion 2 by the lower chuck 8, and the bent connection pipe 1 is taken out.

According to the present embodiment, the bent portion 25
Is heated and softened from the lumen side of the pipe portion 2, so that appearance defects such as melting of the resin due to heating occur only inside the pipe portion 2 which cannot be seen from the outside, and the pipe portion 2 The effect that a bending process can be performed is exhibited. In addition, the allowable range of the temperature of the hot air 19 ejected from the air nozzle 15 can be set large, and the temperature of the hot air 19 can be easily managed.

Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a perspective view of the resin molded product bending apparatus of the present embodiment, and shows a state where the resin molded product is being heated. FIG. 6 is a sectional view showing a bending pin in which a cartridge type heater provided in the present apparatus is embedded. FIG. 7 is a perspective view showing a state in which bending of the resin molded product has been completed.

As shown in FIG. 5, in the apparatus for bending a resin molded product according to the present embodiment, a support plate 4 and two guides 5 and 6 are provided on a base plate (not shown) in the same manner as in the first embodiment. An openable and closable upper chuck 7 and a lower chuck 8 as holding means for holding the pipe-shaped connection pipe 1 as a resin molded product are provided in the same manner as in the first embodiment.

At a position facing the pipe portion 2 of the connection pipe 1 sandwiched between the upper chuck 7 and the lower chuck 8, a position where a cylindrical bending pin 30 as a bending means can be inserted into the inner cavity of the pipe portion 2. It is arranged in. The outer diameter of the bending pin 30 is
The outer diameter is slightly smaller than the inner diameter of the pipe portion 2. As shown in FIG. 6, a small cartridge type heater 3 as a heating means is provided inside the distal end of the bending pin 30.
1, the tip of the bending pin 30 is heated to a predetermined temperature by the cartridge type heater 31, and the bent portion 25 of the pipe 2 can be heated from the lumen side. Examples of the cartridge type heater 31 include C1E13 manufactured by Watlow. Here, the bending pin 30 serves both as a bending means and a heating means.

The bending pin 30 is rotatably mounted on a column 32 erected on a base plate (not shown).
A movable pin driving actuator 33 fixed on the mounting plate 41 allows the pipe portion 2 to move along the rail 34 provided on the mounting plate 41 in the longitudinal direction, that is, the axial direction (the direction of the arrow 35 shown in FIG. 5). Has become.

The turning mechanism 40 includes a bending arm 42, a mounting plate 41, and a bending arm drive actuator 43. The base end of the bending arm 42 is connected to the support column 32 by the pivot 4
6, the center of rotation of the bending arm 42 is set to coincide with the center of the bent portion of the pipe portion 2 held by the upper chuck 7 and the lower chuck 8. The bending arm 42 can be rotated forward and backward in the bending direction (the direction of the arrow 45) of the pipe portion 2 around the rotation center 44 by the bending arm drive actuator 43 attached to the other end of the rotation shaft 46. I have. The mounting plate 41 is fixed to the bending arm 42,
By the rotation of the bending arm 42, the bending arm 42 is rotatable about the rotation center 44 in the direction of the arrow 45. This allows
The bending pin 30 mounted on the mounting plate 41 also rotates in the direction of the arrow 45 about the rotation center 44 of the bending arm 42.
When the bending arm 42 is in the horizontal state, the bending pin 30
The positions of the bending arm 42 and the bending pin 30 are adjusted so that the height of the bending arm 42 matches the height of the pipe portion 2 held by the upper chuck 7 and the lower chuck 8.

Next, the operation of the present embodiment will be described with reference to FIGS. First, the pipe portion 2 of the connection pipe 1 is held and fixed and positioned by the upper chuck 7 and the lower chuck 8 in the same manner as in the first embodiment.

Next, the bending arm drive actuator 43
Is driven to position the bending arm 42 in a horizontal state, and the bending pin 30 is positioned so as to be horizontal and at the same height as the pipe portion 2.

After activating the cartridge type heater 31 and confirming that the tip of the bending pin 30 has reached a predetermined temperature, the bending pin driving actuator 33 moves the bending pin 30 along the rail 34 to the pipe section. 2 and inserted into the lumen of the pipe portion 2. On this occasion,
As shown in FIG. 5, the bending pin 30 is advanced and positioned to a position where the heating portion at the tip of the bending pin 30 heats a predetermined bending portion 25 of the pipe portion 2.

Then, the bent portion 25 of the pipe portion 2 is heated for a predetermined time by the bending pin 30 heated by the cartridge type heater 31, and the bent portion 25 is heated.
Is raised to the heat deformation temperature, the operation of the cartridge-type heater 31 is stopped, and the tip of the bending pin 30 is cooled.

Next, the bending arm 42 is moved by the bending member driving actuator 43 around the rotation center 44 as indicated by an arrow 4.
5 is rotated in the counterclockwise direction (forward rotation) so that the bending pin 3
0 is rotated about the rotation center 44 and the bending pin 30 is rotated.
The external force for bending the pipe portion 2 is transmitted to the second member. As a result, the pipe portion 2 receives a pressing force from the bending pin 30, and the pipe portion 2 causes a bending action. At this time, only the bent portion 25 of the pipe 2 is heated and softened from the tip of the bending pin 30, and the bending pin 30 is
Of the pipe portion 2 pressed by the bending pin 30, the upper chuck 7 and the lower chuck 8.
Therefore, only the heated and softened bent portion 25 is bent without bending the pinched portion.

Then, as shown in FIG.
After the bending operation of bending the pipe portion 2 to a predetermined angle is completed, the rotation of the bending arm 42 is stopped, and the state is maintained. By performing this holding operation for a predetermined time, the bent state of the pipe portion 2 is maintained, and the heated bent portion 25 is cooled, so that the springback of the bent portion can be suppressed.

After holding and cooling the pipe portion 2 for a predetermined time, the bending pin 30 is retracted in the direction of the arrow 35 by the bending pin drive actuator 33, and the bending pin 30 is pulled out from the inner cavity of the pipe portion 2 and connected to the connecting pipe. The bending process 1 is completed. Then, the upper chuck 7 is lifted by the upper chuck driving actuator 9 to release the holding of the pipe portion 2 with the lower chuck 8, and the bent connection pipe 1 is taken out from the bending pin 30 to take out the connection pipe 1.

According to the present embodiment, in addition to the effect of the first embodiment, the pressing force required to bend the pipe portion 2 is:
Since it acts on the inner surface of the pipe portion 2, even if the inner surface is damaged during the bending process, the damage does not appear in the appearance, so that the pipe portion 2 can be bent without impairing the appearance. It works. Furthermore, since the bending pin 30 also serves as a heating means and a bending means for the pipe portion 2, an effect that the structure of the apparatus can be much simplified as compared with a case where the heating means is separately provided with the bending means is provided.

In the present embodiment, the bending pin 30 as a bending member having a built-in cartridge-type heater 31 is used as a heating means, but the air nozzle 15 provided with the air heater 11 shown in the first embodiment is connected to a pipe. By forming the structure having a strength enough to withstand the pressing force when bending the portion 2, it can be used as a bending member that serves both as a heating unit and a bending unit.

The technical idea having the following configuration is derived from the above specific embodiment. (1) In a bending apparatus for a resin molded product having a heating means for heating a bent portion of the resin molded product having an inner cavity and a bending member for bending the bent portion of the resin molded product by applying an external force, An apparatus for bending a resin molded product, wherein a heating means is insertable into a lumen of the resin molded product, and a bent portion of the resin molded product is heated from the lumen side.

(2) The apparatus for bending a resin molded product according to the above (1), wherein the bent portion of the resin molded product is heated by a bending member.

(3) The bending apparatus for resin-molded articles according to the above (1) or (2), wherein the bending member has a built-in cartridge type heater at the tip end.

(4) Holding means for holding a portion other than the portion to be bent of the resin molded product having a lumen, heating means for heating the portion to be bent of the resin molded product from the lumen side, A bending means rotatable about a portion on which the molded product is to be bent.

(5) The apparatus for bending a resin molded product according to (4), wherein the bending means also functions as the heating means.

According to the apparatus (1) for bending a resin molded product, the bending process is heated and softened from the inner side of the resin molded product. The effect that the bending process which does not generate | occur | produce on a surface can be performed is produced.

According to the resin-molded product bending apparatus of the additional item (2), since the bending member also serves as the heating means, it is possible to greatly simplify the apparatus configuration as compared to the case where the bending members are separately formed.

According to the resin-molded product bending apparatus of the above (3), a cartridge-type heater is built in the distal end portion, and a bending member also serving as a heating means is inserted into the cavity of the resin-molded product. By heating and softening the bent part from
There is an effect that the bending process can be performed without causing the appearance defect of the bent portion due to the heating and without pressing the bent portion because the bent portion is not pressed.

According to the resin-molded product bending apparatus according to the above item (4), in addition to the effect of the item (1), since the bent portion of the resin-molded product and the center of rotation of the bending member are matched, the bending is performed. This has the effect that the resin molded product can be accurately bent at the processed part.

According to the apparatus for bending a resin molded product described in Appendix (5), the same effect as in Appendix (3) can be obtained.

[0057]

As described above, according to the apparatus for bending a resin molded product according to the first aspect of the present invention, the bending process is heated and softened from the inner cavity side of the resin molded product. This has the effect that the bending process can be performed without causing the appearance defect of the outer peripheral surface of the resin molded product.

Further, according to the apparatus for bending a resin molded product of the present invention according to the second aspect, in addition to the effect of the first aspect, there is an effect that the bent portion of the resin molded product can be efficiently heated and softened.

Furthermore, according to the apparatus for bending a resin molded article of the present invention according to the third aspect, in addition to the effect of the first or second aspect, since the bending means also serves as the heating means, each of them is separately provided. There is an effect that the configuration of the device can be much simplified as compared with the configuration. Also, by inserting the bending means also serving as the heating means into the lumen of the resin molded product, and heating and softening the bent part from the lumen side, without causing the appearance defect of the bent part due to heating, and In addition, since a pressing force for bending the resin molded product from the lumen side is applied and the bent portion is not pressed, there is an effect that the bending process can be performed without causing the appearance defect due to the pressing.

According to the apparatus for bending a resin molded product of the present invention according to the fourth aspect, a cartridge type heater is built in the tip portion, and a bending member serving also as a heating means is inserted into the inner cavity of the resin molded product. By heating and softening the bent portion from the lumen side, the same effect as in claim 3 can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention, showing a state before heating a resin molded product.

FIG. 2 is a sectional view showing a heating means provided in the first embodiment of the present invention.

FIG. 3 is a perspective view showing the first embodiment of the present invention, showing a state in which the resin molded product is being heated.

FIG. 4 is a perspective view showing the first embodiment of the present invention, showing a state at the time of finishing the bending operation of the resin molded product.

FIG. 5 is a perspective view showing Embodiment 2 of the present invention, showing a state in which a resin molded product is being heated.

FIG. 6 is a sectional view showing a bending pin provided in Embodiment 2 of the present invention.

FIG. 7 is a perspective view showing Embodiment 2 of the present invention, showing a state at the time of completion of a bending operation of a resin molded product.

FIG. 8 is a sectional view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection pipe 2 Pipe part 7 Upper chuck 8 Lower chuck 11 Air heater 15 Air nozzle 17 Air ejection hole 19 Hot air 20 Bending member drive actuator 22 Bending member 25 Bending part 30 Bending pin 31 Cartridge type heater 43 Bending arm drive actuator

Claims (4)

[Claims] 1. A holding means for holding a portion of a resin molded product having a lumen other than a portion to be bent, a heating device for heating a portion of the resin molded product to be bent from a lumen side, A bending means for bending a portion of the product to be bent. 2. The apparatus for bending a resin molded product according to claim 1, wherein said heating means emits hot air toward a portion where the resin molded product is bent. 3. The bending apparatus according to claim 1, wherein the bending means also functions as the heating means. 4. The bending apparatus according to claim 3, wherein the heating means is a cartridge type heater.