JP2006007786A - Worm wheel production apparatus and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production apparatus capable of mass-producing a worm wheel or the like which can supply a worm wheel, a ball gear or the like at low cost by using an injection molding method, and its production method. <P>SOLUTION: The production apparatus for a molded article comprises the first plate having a forming space for filling a resin for forming a molded article, the second plate movable up and down which is set forth over the first plate, the first moving means movable upward for forming an undercut part of the said molded article while performing plastic deformation, and the second moving means movable upward for taking out the molded article molded in the first plate after the second plate is moved upward. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a molded product manufacturing apparatus and a manufacturing method thereof capable of mass-producing a molded product having a worm wheel, a spherical gear, and other undercut portions by an injection molding method without performing cutting or grinding. In particular, the present invention relates to a worm wheel manufacturing apparatus capable of manufacturing a worm wheel by filling a tooth profile space carved into a plate with resin and causing the resin to undergo plastic deformation at a high temperature, and a manufacturing method thereof.

Worm wheels are frequently used as a transmission means that greatly improves the rotation transmission ratio and has a large deceleration rate. Unlike the worm gear, this worm wheel cannot be mass-produced by the injection molding method and is mainly manufactured by cutting. Similarly, spherical gears and the like cannot be mass-produced by the injection molding method and are manufactured by cutting or the like.

However, since the conventional worm wheel cannot be mass-produced by the injection molding method, there is a problem that it is extremely expensive.

Accordingly, there has been a strong demand for the production of a worm wheel and the like, which can be mass-produced by an injection molding method, and can provide a worm wheel, a spherical gear and the like at low cost, and a method for manufacturing the same.

The present invention has been devised in view of the above problems, and is provided with a first plate having a formation space for filling a resin for forming a molded product, and installed above the first plate, in the vertical direction. A movable second plate, and a first upward moving means for forming an undercut portion of the molded product while plastically deforming after filling a resin in a formation space of the first plate; After the second plate moves upward, the second plate is constituted by second upward moving means for taking out the molded product formed by the first plate.

The molded product manufacturing apparatus of the present invention is provided with a first plate having a forming space for filling a resin for forming a molded product, and is installed above the first plate and is movable in the vertical direction. A second plate, a first protruding pin for forming an undercut portion of the molded product while plastic deformation is performed after filling a resin in a formation space of the first plate, and the first plate And a third plate for raising the first ejector pin, and for removing a molded product formed by the first plate after the second plate has moved upward. It is comprised from the 2nd protrusion pin.

And the manufacturing method of the molded article of the present invention comprises a first plate provided with a forming space for filling a resin for forming a molded article, and a second plate installed above the first plate. A first step of abutting and filling the forming space with a resin; and a second step of forming an undercut portion of the molded article by raising a desired height of the solidified resin in the forming space and performing plastic deformation. And a third step for releasing the contact between the first plate and the second plate and taking out the formed product.

Moreover, the manufacturing method of the molded product of the present invention includes a first plate having a formation space for filling a resin for forming a molded product, and a second plate installed above the first plate. A first step of abutting and filling the formation space with a resin; a second step of raising the first ejector pin by a third plate installed below the first plate; and the first A third step of forming an undercut portion of the molded product by plastically deforming the solidified resin in the formation space of the plate with a first protruding pin, and the first plate and the second plate And a fourth step for releasing the contact and taking out the formed product.

Moreover, the manufacturing method of the molded product of the present invention includes a first plate having a formation space for filling a resin for forming a molded product, and a second plate installed above the first plate. A first step of abutting and filling the forming space with a resin; and a second step of forming an undercut portion of the molded article by raising a desired height of the solidified resin in the forming space and performing plastic deformation. A step, a third step for releasing the contact between the first plate and the second plate, and taking out the formed molded product, and a space portion of the molded product formed in the third step. And a fourth step of injecting resin.

The worm wheel manufacturing apparatus of the present invention includes a first plate having a formation space for filling a resin for forming the worm wheel, and a first plate that is installed above the first plate and is movable in the vertical direction. 2 and a first upward movement means for forming a worm portion of the worm wheel while plastically deforming after filling a forming space of the first plate, and the second plate Is moved upward, and is composed of second upward moving means for taking out the worm wheel formed by the first plate.

Furthermore, the worm wheel manufacturing apparatus according to the present invention includes a first plate having a formation space for filling a resin for forming the worm wheel, and a first plate that is installed above the first plate and is movable in the vertical direction. 2, a first protruding pin for forming a worm portion of the worm wheel while plastic deformation is performed after filling a forming space of the first plate, and a lower portion of the first plate And a second plate for taking out the worm wheel formed by the first plate after the second plate has moved upward, and a third plate for raising the first ejection pin. It consists of a protruding pin.

In the worm wheel manufacturing method of the present invention, the first plate having a formation space for filling the resin for forming the worm wheel and the second plate installed above the first plate are applied. A first step in which the forming space is filled with a resin, and a second step in which the resin solidified in the forming space is raised to a desired height and plastic deformation is performed to form a worm portion of the worm wheel. And a third step for releasing the contact between the first plate and the second plate and taking out the formed worm wheel.

In the worm wheel manufacturing method of the present invention, the first plate having a formation space for filling the resin for forming the worm wheel and the second plate installed above the first plate are applied. A first step of contacting and filling the forming space with a resin, a second step of raising the first protruding pin by a third plate installed below the first plate, and the first A third step of forming a worm portion of the worm wheel by plastically deforming a solidified resin in a plate forming space by a first protruding pin; and abutting between the first plate and the second plate And a fourth step for taking out the formed worm wheel.

Furthermore, the present invention is a spherical gear instead of the worm wheel, and can be a tooth portion instead of the worm portion.

In the worm wheel of the present invention, the first plate provided with a forming space for filling the resin for forming the worm wheel is brought into contact with the second plate installed above the first plate. After forming the resin into the forming space, the resin solidified in the forming space is plastically deformed to form the worm portion of the worm wheel.

"Action"
In the present invention configured as described above, the formation space of the first plate is filled with the resin for forming the worm wheel, and the second plate installed above the first plate moves in the vertical direction. After the first plate forming space is filled with resin, the first upward movement means forms the worm portion of the worm wheel while performing plastic deformation, and the second plate is moved upward. After the movement, the second upward movement means takes out the worm wheel formed by the first plate.

Further, the first upward movement means may be constituted by a first protrusion pin, and the first protrusion pin may be driven by a third plate installed below the first plate. Furthermore, the second upward movement means can be constituted by a second protruding pin.

And the manufacturing method of the molded article of the present invention comprises a first plate provided with a formation space for filling a resin for forming a molded article, and a second plate installed above the first plate. After the resin is filled in the forming space by abutting, the resin solidified in the forming space is raised to a desired height and plastically deformed to form an undercut portion of the molded product, and the first plate And the second plate are released from contact with each other, and the formed product can be taken out.

Furthermore, resin can also be inject | poured into the space part of the formed molded article.

In the worm wheel manufacturing method of the present invention, the first plate having a formation space for filling the resin for forming the worm wheel and the second plate installed above the first plate are applied. After the resin is filled in the forming space, the solidified resin is raised to a desired height in the forming space and plastically deformed to form the worm portion of the worm wheel. The contact with the two plates can be released, and the formed worm wheel can be taken out.

Further, the third plate installed below the first plate can raise the first protruding pin to cause plastic deformation.

Furthermore, the worm wheel of the present invention makes a first plate provided with a forming space for filling a resin for forming the worm wheel and a second plate installed above the first plate abut. It is also possible to form the worm portion of the worm wheel by filling the forming space with resin and then plastically deforming the solidified resin in the forming space.

The present invention configured as described above includes a first plate provided with a formation space for filling a resin for forming a worm wheel, and a second plate installed above the first plate. After the abutment is made to fill the formation space with resin, the solidified resin is plastically deformed in the formation space to form the worm portion of the worm wheel. Since the wheel can be mass-produced, there is an excellent effect that it is possible to provide a worm wheel at a very low cost compared to cutting and the like.

In addition, the present invention can produce a molded product having a spherical gear or an undercut portion by an injection molding method in the same manner as the worm wheel.

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a main part of a worm wheel manufacturing apparatus 1 according to this embodiment. The worm wheel manufacturing apparatus 1 includes a first plate 2 and a second plate installed above the first plate 2. 3 and a third plate 4 installed below the first plate 2.

The first plate 2 is formed with a formation space 21 for filling a resin for forming a worm wheel. The forming space 21 is engraved with an inclined tooth shape so that the tooth shape of the worm portion of the worm wheel is formed, and a worm wheel can be formed by filling the space with resin.

The second plate 3 can move up and down, and is installed above the first plate 2. The second plate 3 is lowered to be able to come into contact with the first plate 2 and is filled with resin at the time of contact.

The 3rd plate 4 is installed under the 1st plate 2, and is for raising the 1st protrusion pin 5. As shown in FIG. The first protruding pin 51 passes through the first plate 2 and reaches the formation space 21, and the solidified resin in the formation space 21 can be raised to a desired height.

The second protrusion pin 6 penetrates through the third plate 4 and the first plate 2 to reach the formation space 21, and protrudes the solidified resin in the formation space 21 to release it to the outside. Can do. The second protruding pin 6 corresponds to the second upward moving means.

In the worm wheel manufacturing apparatus 1 of the present embodiment, the first plate 2, the second plate 3, and the third plate 4 are connected by pins 7. Furthermore, a first return pin 81, a second return pin 82, and a third return pin 83 are attached to the worm wheel manufacturing apparatus 1.

Further, a first spring member 91 is formed on the first plate 2 and urges the first plate 2 upward.

FIG. 2 shows an overall view of the worm wheel manufacturing apparatus 1 of this embodiment. A first upward moving means 5 is formed in the third plate 4, and the first upward moving means 5 includes a first protruding pin 51, a drive plate 52, a stopper 53, and a second And a spring member 92.

The first plate 2 is formed with a mounting portion 22 for supporting a forming space 21 for filling a resin for forming a worm wheel. The mounting portion 22 includes a bearing 110, a bearing 120, It is connected to the first plate 2 through a bearing 130 and a bearing 140 so as to be rotatable.

FIG. 3 is a plan view of the first plate 2, and a formation space 21 is formed at the center. The formation space 21 is filled with resin, and a worm is cut on the outer peripheral portion 211 of the formation space 21.

In this embodiment configured as described above, the first plate 2 and the second plate 3 are brought into contact with each other, and the contact surface between the first plate 2 and the second plate 3 is used as a PL surface. . Next, the resin is fed into a formation space 21 formed in the first plate 2 from an appropriately set runner. As the resin that is fed into the formation space 21, aria acetal, nylon, or the like is used, but other resins may be used. In this embodiment, the resin is supplied at a temperature of about 180 ° C., but can be changed to an appropriate temperature.

Next, the first plate 2 and the third plate 4 are separated. As the driving force at this time, the elastic restoring force of the first spring member 91 is used. The separation control can be executed by using a normal mold.

And if the 2nd plate 3 and the 3rd plate 4 are isolate | separated, the mounting part 22 for supporting the formation space 21 will fall. Next, before separating the first plate 2 and the second plate 3, the first protruding pin 51 is protruded upward to raise the solidified resin in the formation space 21 to a desired height. Note that the elastic restoring force of the second spring member 92 is used as the upward force of the first protruding pin 51. The control of the first protruding pin 51 can be executed by using a normal mold. At this time, since the temperature of the resin is about 80 ° C., it is plastically deformed along the worm cut portion formed in the outer peripheral portion 211 of the formation space 21 to form the worm portion of the worm wheel.

Next, after the first plate 2 and the second plate 3 are separated, the second protrusion pin 6 is raised, and the completed worm wheel 100 shown in FIG. 4 can be discharged to the outside. The control of the second ejection pin 6 can be executed by using a normal mold. Furthermore, the separation control of the first plate 2 and the second plate 3 can be performed by using a normal mold.

By repeating the above operation, the worm wheel 100 can be mass-produced by the injection molding method.

The worm wheel 100 may be divided into two in the longitudinal direction, and each may be molded and then bonded.

Next, a modification of the embodiment of the present invention will be described. First, a first modified example for manufacturing the spherical gear 200 shown in FIG. 5 in place of the worm wheel 100 will be described.

The spherical gear 200 can be injection molded by using the worm wheel manufacturing apparatus 1 having the same configuration as in the present embodiment. That is, the formation space 21 in which the resin for forming the tooth portions 210, 210,... Of the spherical gear 200 is filled in the first plate 2 is formed.

Then, similarly to the worm wheel 100, the molded spherical gear 200 can be taken out by performing plastic deformation.

Next, a second modification of the present embodiment will be described with reference to FIG. The second modification relates to the production of a molded product having an undercut.

As shown in FIG. 6 (a), the molded product 300 of the Christmas tree shown in this modification has undercut portions 310, 310..., And therefore cannot normally be pulled out from the mold. Therefore, by using the worm wheel manufacturing apparatus 1 described in the present embodiment, a molded product having an undercut portion can be manufactured.

That is, as shown in FIG. 6B, the outer skin portion 320 is formed using a relatively soft resin, and the outer skin portion 320 is plastically deformed in a high temperature state as in the above embodiment. When the outer skin portion 320 is cured by cooling, the outer skin portion 320 of the molded article 300 of the Christmas tree having the undercut portions 310, 310. Further, as shown in FIG. 6C, if the resin 330 is injected again into the space surrounded by the outer skin portion 320, the molded article 300 of the Christmas tree can be manufactured.

In addition, the manufacturing apparatus which performs plastic deformation can be realized with the same configuration as the worm wheel manufacturing apparatus 1, and the molded product can be applied not only to the Christmas tree but also to all molded products having an undercut portion. .

In addition, since the basic configuration and the like of the first and second modified examples are the same as those of the above-described embodiment, description thereof will be omitted.

It is a figure which shows the principal part of a structure of the worm wheel manufacturing apparatus 1 of the Example of this invention. It is a figure explaining the structure of the worm wheel manufacturing apparatus 1 of a present Example. It is a top view of the 1st plate 2 of a present Example. It is a figure explaining the worm wheel 100 produced with the worm wheel manufacturing apparatus 1 of a present Example. It is a figure explaining the spherical gear 200 of the 1st modification of this invention. It is a figure explaining the 2nd modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Worm wheel manufacturing apparatus 2 1st plate 21 formation space 211 outer peripheral part 22 mounting part 3 2nd plate 4 3rd plate 5 1st upward movement means 51 1st protrusion pin 6 2nd protrusion pin 7 Pin 81 First return pin 82 Second return pin 83 Third return pin 91 First spring member 92 Second spring member 100 Worm wheel 200 Spherical gear 300 Molded product 310 Undercut portion 320 Skin portion

Claims (11)

  A first plate having a formation space for filling a resin for forming a molded product, a second plate installed above the first plate and movable in the vertical direction, and the first plate A first upward moving means for forming an undercut portion of the molded product while plastic deformation is performed, and after the second plate has moved upward, An apparatus for manufacturing a molded product, comprising: a second upward movement means for taking out the molded product formed by one plate.   A first plate having a formation space for filling a resin for forming a molded product, a second plate installed above the first plate and movable in the vertical direction, and the first plate A first projecting pin for forming an undercut portion of the molded product while being plastically deformed after the resin is filled in the forming space, and the first projecting pin installed below the first plate. Manufacture of a molded product comprising a third plate for raising the pin and a second protruding pin for taking out the molded product formed by the first plate after the second plate has moved upward apparatus.   A first plate having a formation space for filling a resin for forming a molded product and a second plate installed above the first plate are brought into contact with each other to fill the formation space with the resin. A first step for causing the resin solidified in the formation space to rise to a desired height and causing plastic deformation to form an undercut portion of the molded product, the first plate, and the first step A method for producing a molded product, comprising: a third step for releasing contact with the plate 2 and taking out the formed molded product.   A first plate having a formation space for filling a resin for forming a molded product and a second plate installed above the first plate are brought into contact with each other to fill the formation space with the resin. And a second step of raising the first ejector pin by a third plate installed below the first plate, and a resin solidified in a formation space of the first plate A third step in which an undercut portion of the molded product is formed by plastic deformation with one protruding pin, and the formed product formed by releasing the contact between the first plate and the second plate; The manufacturing method of the molded article which consists of a 4th process for taking out.   A first plate having a formation space for filling a resin for forming a molded product and a second plate installed above the first plate are brought into contact with each other to fill the formation space with the resin. A first step of causing the resin solidified in the formation space to rise to a desired height and causing plastic deformation to form an undercut portion of the molded product, the first plate and the first The third step for releasing the contact with the plate 2 and taking out the formed molded product, and the fourth step for injecting resin into the space of the molded product formed in the third step. Method for manufacturing molded products.   A first plate having a formation space for filling a resin for forming a worm wheel; a second plate installed above the first plate and movable in the vertical direction; and the first plate After the resin is filled into the forming space, the first upward moving means for forming the worm portion of the worm wheel while performing plastic deformation, and after the second plate has moved upward, the first A worm wheel manufacturing apparatus comprising second upward moving means for taking out the worm wheel formed by the plate.   A first plate having a formation space for filling a resin for forming a worm wheel; a second plate installed above the first plate and movable in the vertical direction; and the first plate A first projecting pin for forming a worm portion of the worm wheel while plastic deformation is performed after filling the forming space with the resin, and the first projecting pin installed below the first plate. A worm wheel manufacturing apparatus comprising a third plate for raising the worm wheel and a second protrusion pin for taking out the worm wheel formed by the first plate after the second plate has moved upward.   A first plate having a forming space for filling a resin for forming a worm wheel is brought into contact with a second plate installed above the first plate, and the forming space is filled with the resin. A first step of forming the worm portion of the worm wheel by raising a desired height of the solidified resin in the formation space and performing plastic deformation, the first plate, and the second A worm wheel manufacturing method comprising a third step for releasing contact with the plate and taking out the formed worm wheel.   A first plate having a forming space for filling a resin for forming a worm wheel is brought into contact with a second plate installed above the first plate, and the forming space is filled with the resin. And a second step of raising the first ejector pin by a third plate installed below the first plate, and a resin solidified in a formation space of the first plate A third step of forming the worm portion of the worm wheel by plastically deforming with one protruding pin, releasing the contact between the first plate and the second plate, and forming the formed worm wheel A worm wheel manufacturing method comprising a fourth step for taking out.   The ball gear manufacturing apparatus or method according to claim 6, wherein a ball gear is used instead of the worm wheel, and a tooth portion is used instead of the worm portion.   A first plate having a forming space for filling a resin for forming a worm wheel is brought into contact with a second plate installed above the first plate, and the forming space is filled with the resin. Then, the worm wheel of the worm wheel is formed by plastically deforming the solidified resin in the formation space.

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