JPH069838B2 - Insert holding device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an insert holding device for holding an insert on a support rod that releases a synthetic resin molded product from a mold.

[Conventional technology]

An example of a conventional insert holding device is shown in FIGS.
4 will be described.

Reference numeral 1 is a support rod, and an extension portion 3 is formed at one end portion in the axial direction via a step portion 2 and a piston portion 4 is formed at the other end portion. It is slidably fitted. Further, a pair of ventilation pipes 8 and 9 selectively connected to an air source 7 by an electromagnetic valve 6 are connected to both ends of the air cylinder 5.

Then, as shown in FIG. 12, for example, the holes 11 of the insert 10 composed of the spokes of the steering wheel and the rim core bar are abutted against the step 2 of the support rod 1 and extended to the extension 3. Fit and set the insert 10. Then, as shown in the same FIG. 12, the support rod 1
The insert 10 with the retracted (moved to the right in the figure)
The synthetic resin outer cover is molded on the rim core metal. After the molding, as shown in FIG. 13, the support rod 1 is moved forward by the operation of the solenoid valve 6, the insert 10, that is, the synthetic resin product is projected and separated from the mold (not shown). Further, as shown in FIG. 14, the hole portion 11 of the insert 10 is pulled out from the extension portion 3 of the support rod 1, and the product is taken out.

[Problems to be solved by the invention]

In the conventional device as described above, during the mold clamping operation of the press after setting the insert 10, there is a risk that the insert 10 may fall off or be displaced, and there is also a risk that the insert 10 may fall off during mold release after molding. There was a problem.

Therefore, in order to prevent the insert 10 from falling off, it is conceivable to elongate the extension portion 3 of the support rod 1, but the structure is such that the hole portion 11 of the insert 10 is simply fitted into the extension portion 3. Since there is no change, the above problems cannot be completely solved.

Although it is conceivable to incline the mold and the support rod 1, since the inclination direction is limited to the direction in which the insert 10 does not fall off, the optimum gas escape inclination angle for removing the gas generated in the mold during molding. There are restrictions on the setting of.

The present invention is intended to solve the above-mentioned problems, and it is possible to reliably hold an insert in a fixed position and prevent the insert from falling off, and to establish an optimum inclination angle for degassing. That is the purpose.

[Means for solving problems]

According to the present invention, an extension part 43 is provided on a support rod 41 that is movable back and forth for releasing a synthetic resin molded product via a step part 42, and the exposed hole part 24 of the insert 21 is fitted into the extension part 43. In the insert holding device that supports this insert 21,
A fitting hole 46 extending in the axial direction is formed in the support rod 41, and an insert fixing rod is formed in the fitting hole 46.
51 is fitted back and forth freely, and the support rod 41 is fitted with its fitting hole.
An insert holder 5 is formed that forms a groove 47 communicating with the outer peripheral surface of the support rod 41, and that moves in and out of the insert fixing rod 51 through the groove 47 of the support rod 41 as the insert fixing rod 51 moves back and forth.
6 and 71 are provided, and the insert 21 is sandwiched and held by the insert holders 56 and 71 protruding from the groove portion 47 and the step portion 42 of the support rod 41.

[Action]

According to the present invention, when the insert 21 is set, the support rod 41 is inserted in the groove 47 of the support rod 41 while the insert holders 56 and 71 provided on the insert fixing rod 51 are immersed in the support rod 41.
Fit the hole 24 of the insert 21 into the extension 43 of the
For example, while the support rod 41 is retracted, the holder 56,
71 is projected from the groove portion 47, and the insert 21 is held in a fixed state by the holding bodies 56 and 71 and the step portion 42 of the support rod 41 to perform mold clamping and molding. After the molding, the fixing rod 51 , And then the support rod 41 is advanced to project the insert 21, and with the holders 56 and 71 immersed, the hole 24 of the insert 21 is pulled out from the support rod 41, and a synthetic resin molded product is obtained. It is something to take out.

〔Example〕

An embodiment of the insert holding device of the present invention will be described below with reference to FIGS. 1 to 6.

This device is used when molding a synthetic resin covering of the rim portion of a steering wheel.

Reference numeral 21 denotes an insert, which is composed of a steering wheel spoke portion 22 and a rim core metal 23.
A hole portion 24 for mounting the boss portion is formed in the center portion of 21.

In FIG. 1, reference numerals 31 and 32 are a pair of dies that can be freely contacted and separated, and the insert 21 is attached to the joint surface of these dies 31 and 32.
A cavity 33 in which the rim core metal 23 is located is formed, and a groove portion 34 into which the spoke portion 22 is fitted is formed. Further, an after-mixer 35 and a gate 36 for supplying the reactive mixed stock solution to the cavity 33 are formed on the joint surfaces of the molds 31, 32. Further, a space 37 in which the center of the insert 21 is located is formed in the center of each of the molds 31 and 32.
An insert holding device is provided in the.

41 is a support device support rod, the front side (left side in the figure)
Are reduced in diameter via the step portion 42 and formed in the extension portion 43. Further, the piston portion 4 is provided at the rear end of the support rod 41.
4 is formed, and the piston portion 44 is fitted in the first air cylinder 45 so as to be slidable in the front-rear direction. A fitting hole 46 extending in the direction of the central axis of the support rod 41 is formed so as to penetrate therethrough. Further, the extension portion 43 of the support rod 41 has an outer peripheral surface and the fitting hole 46.
There is formed a pair of upper and lower groove portions 47 communicating with the groove portion 47, and the groove portion 47 has a front end formed on an inclined surface 48 that is inclined inward toward the front and a rear end of the step portion 42. It is located in the vicinity. The support rod 41 has a sixth
As shown in the figure, it is divided and molded with a surface passing through the rear end of the inclined surface 48 as a dividing surface, and a rod main body 41a on the rear side of this dividing surface and a front side attached to the rod main body 41a with a screw 49. It consists of color 41b.

Reference numeral 51 denotes an insert fixing rod, which is fitted in the fitting hole 46 of the support rod 41 so as to be able to move forward and backward. A piston portion 52 is formed at the rear end portion of the fixing rod 51, and the piston portion 52 is inside a second air cylinder 53 that is airtightly partitioned from the first air cylinder 45. It is fitted so that it can slide in the front-back direction. Further, a pair of upper and lower recesses 54 are formed at the front end of the fixing rod 51, and a support shaft 55 provided in these recesses 54.
Further, a pair of rod-shaped insert holders 56 are rotatably supported. Further, both ends of the leaf spring 57 are respectively engaged with the rear surface of the recess 54 and the insert holder 56, and the leaf spring 57 constantly urges the insert holder 56 forward.

A ventilation pipe 63 connected to the air source 62 when the first solenoid valve 61 is off and an air source 62 when the first solenoid valve 61 is on are provided at the front end and the rear end of the first air cylinder 45. And a ventilation pipe 64 connected to each. On the other hand, a vent pipe 66 connected to the air source 62 when the second solenoid valve 65 is turned on is provided at the front end and the rear end of the second air cylinder 53.
And a ventilation pipe 67 connected to an air source when the second solenoid valve 65 is off.

Next, the operation of the apparatus of this embodiment will be described.

When the insert 21 is set, as shown in FIG. 2, both solenoid valves 61 and 65 are in the off state, and the support rod is
41 is located at the backward limit, and the insert fixing rod 51 is located at the forward limit. In this state, the insert holding body 56 provided on the support rod 41 is pressed by the inclined surface 48 of the groove portion 47 of the fixing rod 51 and inclined, and is recessed in the groove portion 47. Then, the hole portion 24 of the insert 21 is fitted into the extension portion 43 of the support rod 41 and abutted against the step portion 42 thereof.

Next, the second solenoid valve 65 is turned on, and the fixing rod 51
Retreat. Then, as the insert holder 56 separates from the inclined surface 48, the holder 56 is raised to a substantially vertical state by the bias of the leaf spring 57, and is projected from the groove portion 47. Then, as shown in FIG. 3, when the holding body 56 abuts on the insert 21, the holding body 56 is also brought into contact with the rear surface of the recess 54 to be in a completely vertical state, and is held in this state. In this state, the insert 21 is sandwiched between the step portion 42 of the support rod 41 and the holding body 56, and is held while being securely fixed to the support rod 41.

Then, as shown in FIG. 1, one die 31 is joined to the other die 32 to mold the synthetic resin jacket of the rim portion.

In such a mold clamping operation, as described above, the insert 21 is held in the state where it is securely fixed to the support rod 41, so that there is no possibility that the insert 21 will fall out and there is no possibility that a positional deviation will occur. Therefore, damage to the molds 31 and 32 due to the displacement of the insert 21 is also prevented.

After the molding, the one die 31 is separated from the other die 32, and then the second electromagnetic valve 65 is turned off to move the fixing rod 51 to the forward limit as shown in FIG. . Further, the first solenoid valve 61 is turned on and the support rod 41 is advanced. Along with this, the insert 21, that is, the synthetic resin molded product is ejected and separated from the mold 31. At this time,
The holding body 56 axially attached to the fixing rod 51 is relatively separated from the inclined surface 48 of the groove portion 47 of the support rod 41, and thus slightly protrudes from the groove portion 47. Therefore, the accident of dropping the insert 21 due to the impact at the time of protrusion is prevented.

Next, when the first solenoid valve 61 is turned off and the support rod 41 is moved to the retracted limit, the holding body 56 causes the inclined surface 48 of the groove portion 47 to move.
The rods 41, 51 are pressed by the
Returns to the initial state shown in FIG. Then, the hole 24 of the insert 21 is pulled out from the extension 43 of the support rod 41, and the synthetic resin molded product is taken out.

According to the above configuration, since the insert 21 is held in a state of being securely fixed to the support rod 41, there is no restriction on the inclination angles of the molds 31 and 32, and therefore, it is optimal for removing the gas generated during molding. The tilt angle can be set. At the same time, the mold clamping operation of the press can be accelerated, so that the molding cycle can be shortened.

Next, another embodiment of the present invention will be described with reference to FIGS. The parts corresponding in structure to those of the previous embodiment are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, at the front end portion of the insert fixing rod 51, a storage hole 70 extending in the vertical direction and orthogonal to the central axis direction is formed.
Are formed through. A pair of upper and lower insert holders 71 are fitted in the housing hole 70 so as to be vertically slidable. These holders 71 have horizontal plate portions 72 at their lower or upper ends, and projections 73 are formed on the surfaces of these horizontal plate portions 72 facing each other. Further, the front surface of these holding bodies 71 is an inclined surface that inclines inward toward the front.
It is formed on 74, and the rear surface is formed vertically. Then, these holding bodies 71 are constantly urged in the projecting direction by the coil springs 75 whose both ends are fitted to the protrusions 73, and in the state where they are prevented from coming off by the horizontal plate portion 72,
The support rod 41 is adapted to project and retract via the groove portion 47.

Then, the operation of this embodiment is similar to that of the previous embodiment. That is, FIG. 7 shows a state when the insert 21 is set. In this state, the support rod 41 is retracted and the fixing rod 51 is advanced, and both holding bodies 71 have their inclined surfaces 74. The inclined surface of the groove 47 of the support rod 41
48 is pressed and is immersed in the groove 47. Also,
FIG. 8 shows the state at the time of mold clamping and molding, both rods 41 and 42 are retracted, and the insert 21 has a groove portion.
The holding body 71 protruding from the 47 and the stepped portion 42 of the support rod 41 are held together. Further, FIG. 9 shows a state at the time of mold release, in which both rods 41 and 42 are both advanced,
The holding body 71 projects from the groove portion 47. Further, FIG. 10 shows a state when the product is taken out, and both rods 41, 51 are shown.
Has returned to the initial state shown in FIG.

〔The invention's effect〕

According to the present invention, the insert fixing rod is movably fitted to the supporting rod for supporting and releasing the synthetic resin molded product, and the fixing rod is projected and retracted via the groove portion of the supporting rod as the fixing rod advances and retracts. Since the insert holding body is installed, and the insert holding body and the stepped portion of the support rod hold the insert in place, the insert is securely held in a fixed state after setting, and the insert does not fall off or move during the mold clamping operation. It is possible to surely prevent misalignment, and also to prevent falling off during mold release. Therefore, mold clamping operation etc. can be speeded up, so the molding cycle can be shortened and there is no restriction on the mold tilt angle, which is ideal for degassing. You can set a different tilt angle.

[Brief description of drawings]

FIG. 1 is a cross-sectional view including a mold showing an embodiment of the apparatus of the present invention, and FIGS. 2 to 5 are views when the insert is set,
Sectional views showing the states at the time of mold clamping, mold release, and removal, FIG. 6 is an exploded perspective view of the front portion of the rod, and FIGS. 7 to 10 are inserts showing other embodiments of the present invention. Sectional views of the front part of the rod during setting, mold clamping, releasing and taking out, FIG. 11 is an exploded perspective view of the front part of the rod, and FIGS. 12 to 14 show an example of a conventional device. FIG. 5 is a cross-sectional view of the insert when set, released, and taken out. 21 …… Insert, 24 …… Hole, 41 …… Support rod, 42
...... Steps, 43 ...... Extended parts, 46 ...... Mating holes, 47 ...... Grooves, 51 ...... Insert fixing rods, 56, 71 ...... Insert holder.

Claims (1)

[Claims] 1. An extension part is provided on a movable support rod for releasing a synthetic resin molded product through a step part, and an exposed hole part of an insert is fitted into this extension part to support the insert. In the insert holding device, a fitting hole extending in the axial direction is formed in the support rod, and an insert fixing rod is fitted in the fitting hole so as to be able to advance and retreat. And a step of the insert rod that protrudes from the groove and the support rod that protrudes from the groove. An insert holding device characterized in that an insert is held by being held by a section.