JPH0425417A - Molding method for molding - Google Patents

Abstract

PURPOSE:To mold a molding efficiently by computing the heating time of a mold from the feed-out temperature of the mold out of a heating furnace provided in a heating station, the temperature of the mold before feeding the same into the heating furnace and the temperature in the heating furnace before feeding in the mold and adjusting the waiting time of the mold based on the heating time. CONSTITUTION:The feed-out temperature T1 of a mold 12 out of a heating furnace 30 provided in a first heating station 14 is set based on the characteristics data of the mold 12 such as the material quality and shape. The temperature T2 of the mold 12 before feeding into the heating furnace 30 is sensed by a radiation thermometer disposed in a first elevator station 24. The temperature T3 in the heating furnace 30 before the mold 12 is fed in is sensed by a temperature sensor. Through the temperature information on the feed-out temperature T1 out of the furnace, the temperature T2 and the temperature T3, the heating time A of the mold 12 is computed by a control device 29. Then, the computed heating time A and the reference heating time A' are compared with and the waiting time B in a releasing station 22 is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for molding a resin molded body, in which the molded body is molded using a multi-station type slush molding mold.

[Prior Art] For example, a skin body (molded body) formed by slush molding using a resin-based molding material is used as an interior body in which an automobile instrument panel or the like is incorporated.

In this case, the slush molding includes a step of preheating the mold, a step of charging a molding material such as vinyl chloride plastisol or powder into the heated mold, and discharging the excess molding material. a step of further heating the mold; a step of cooling the heated mold;
There are steps such as taking out the skin from the mold, and the skin is molded by sequentially transporting a plurality of molds between each process.

U Problems to be Solved by the Invention] By the way, in order to efficiently and mass-produce skin bodies, for example, by heating each mold for a preset time while keeping the amount of heat from a heating burner constant, One possible method is to heat the mold to a desired temperature in a short time. However, especially when using an electroforming mold as a mold,
Heating conditions vary due to differences in the thickness of each electroforming mold, making it difficult to constantly heat these electroforming molds to a constant temperature.

The present invention solves this kind of problem, and makes it possible to efficiently and accurately heat two or more molds that are circulated between each station to a desired temperature, and also eliminates unnecessary heating. It is an object of the present invention to provide a method for molding a resin molded body, which can efficiently mold a molded body by reducing waiting time as much as possible.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a molding method for obtaining a molded article from a resin molding material by circulating two or more molds between each work station. The steps include: setting the temperature at which the mold is discharged from the heating furnace provided in the heating station; detecting the temperature of the mold before being carried into the heating furnace; and detecting the temperature of the mold before being carried into the heating furnace. and a step of calculating the heating time of the mold from the set temperature for unloading the mold, the detected temperature of the mold before being carried in, and the temperature inside the heating furnace. The present invention is characterized by comprising the step of adjusting a waiting time of a mold carried into a station preceding the heating station based on the calculated heating time.

[Function] In the above method for molding a resin molded article according to the present invention, the temperature at which the mold is discharged from the heating furnace provided in the heating station, the temperature of the mold before being carried into the heating furnace, and the Since the heating time of the mold is calculated from the temperature in the heating furnace before the mold is brought in, the mold can always be accurately heated to the desired temperature without being affected by changes in external conditions. . Moreover, by adjusting the waiting time of the mold carried into the station before the heating station based on this heating time, this waiting time can be shortened as much as possible to efficiently mold the molded product. becomes possible.

[Example] The method for molding a resin molded article according to the present invention will be described in detail below with reference to the accompanying drawings, using examples in connection with a molding apparatus for carrying out the method.

In FIG. 2, reference numeral 10 indicates a molding device for carrying out the molding method according to this embodiment. This molding device 1
0 is a first heating station 14 that heats a mold 12 fixed to a conveyor table 11 to a desired temperature, and a resin molding material is supplied to the heated mold 12 to weld it, and then an unnecessary a welding station 16 for discharging molding material;
a second heating station 18 that heats the welded molding material; and a cooling station 2 that cools the mold 12.
0, a take-out station 22 for taking out the skin body from the mold 12 after cooling, and an il heating station 1.
4. The welding station 16, the second heating station 18, and the cooling station 20 have a two-stage structure, and the mold 12 can be circulated between the first and second lifting stations 24 and 26, and each station 14 to 26. The transport mechanism 28 is driven and controlled by a control device 29.

The first heating station 14 has a heating furnace 30, in which a burner 32 serving as a heating means is arranged, and a driving means 34 for rotating (swinging) the mold 12 is provided. . A temperature detection sensor (not shown) is provided in the heating furnace 30 to detect the temperature inside the heating furnace 30, and this temperature detection sensor supplies temperature information inside the heating furnace 30 to the control device 29.

The welding station 16 includes a resin supply mechanism 36 for molding a skin layer in the molding cavity of the mold 12, and a foamable resin supply mechanism 3 for molding a foam layer on the skin layer.
8, and a driving means 40 for rotating the mold 12.
Equipped with.

The second heating station 18 includes a heating furnace 42 and a driving means 44 for swinging the mold 12 within the heating furnace 42 within a predetermined angular range.

At the entrances and exits of the first heating station 14, the welding station 16, and the second heating station 18, there are cylinders 4
Shutters 48a to 48d that engage with shutters 6a to 46d
will be placed.

The cooling station 20 has a cooling chamber 52 in which a cooling water supply means 50 is housed, and a driving means 54 for inverting the mold 12 within the cooling chamber 52. Air blowing means 56 is arranged between the cooling station 20 and the second heating station 18 to slowly cool the skin.

The take-out station 22 is provided outside the circulation path of the molding device 10 and has a drive means 58 for swinging the mold 12 in order to take out the skin from the mold 12.

The first and second lifting stations 24.26 are equipped with a lifting table 62 that engages with a motor 60, and a conveyor belt 64.66 that constitutes the conveying mechanism 28 and is disposed vertically in parallel, and this lifting table 62. A circular conveyance path is formed. This conveyance mechanism 28 has a conveyance path 68 arranged at the take-out station 22 , and this conveyance path 68 moves the mold 12 back and forth between the take-out station 22 and the lifting table 62 .

A radiation thermometer (not shown) is disposed on the first lifting station 24 to detect the temperature of the mold 12, and this radiation thermometer supplies temperature information of the mold 12 to the control device 29.

Next, the operation of the molding apparatus IO configured as described above is as follows.
The relationship with the molding method according to this embodiment will be explained below with reference to FIG.

■ Heating furnace 30 installed in the first heating station 14
The unloading temperature T1 of the mold 12 is set based on characteristic data such as the material and shape of the mold 12, and is supplied to the control device 29.

■ The temperature T2 of the mold 12 before being carried into the heating furnace 30 is
It is detected by a radiation thermometer disposed on the first lifting station 24 and is supplied to the control device 29 .

■ Temperature T inside the heating furnace 30 before the mold 12 is carried in
3 is detected via a temperature detection sensor (not shown) and supplied to the control device 29.

(1) The set temperature T1 of the mold 12 to be taken out of the mold, the detected temperature T2 of the mold 12 before being brought in, and the heating furnace 3.
The control device 2
9, the heating time A of the mold 12 is calculated. This heating time A is determined by the following formula.

A=αXT2+βXT3-1-rxT1+, however, α,
β, γ, and K are selected from a large number of data sets including T1, T2, T3, and A, and the most appropriate values are selected by a statistical method based on this data.

Here, α=-0,8, β=-0,1, r=0.3
, K=200, the heating time A has the values shown in Table 1 below.

In the case shown in the table, Example 1 shows the heating time A at temperatures T2 and T3 that are similar to that of the boat, and in the case of Example 2 (well, the mold 12 is at a low temperature and the heating time A is long), in addition, Example 3 is heating furnace 3
The temperature T3 is within 0 (indicates the case where the heating time A is short at a high temperature).

In this way, by adjusting the heating time A, the mold 12 can be constantly heated to the desired furnace temperature T1 without being affected by fluctuations in various external conditions, and a high-quality skin body can be produced by the molding operation described later. It becomes possible to mold.

(2) A reference heating time A' at the first heating station 14 and a reference waiting time B' at the take-out station 22 are set in advance. Here, in order to allow a new mold 12 to be placed near the heating furnace 30 immediately after the heating operation of the mold 12 is completed, the standard waiting time B' is calculated by taking into consideration the transportation time of the new mold 12. The value is selected to be smaller than the reference heating time A'.

If the calculated heating time A is smaller than the standard heating time A'(A'-A=C≧0), the waiting time B at the take-out station 22 is the difference time C from the standard waiting time B'. (B=B'-C).

If heating time A is within the standard range (-25<C<0),
The standby time B is set to the standard standby time B', and when the heating time A is longer than the standard range (C≦-25), it is regarded as abnormal and the molding apparatus 10 is stopped.

Next, to roughly explain the molding operation by this molding device 10, the heating furnace 30 of the first heating station 14
The mold 12 conveyed therein is heated by the burner 32 while rotating integrally with the conveyance table 11 via the driving means 34 . At this time, the next mold 12 is being carried into the take-out station 22, and the measurement of heating time A and standby time B is started.

Here, since the reference standby time B' is set to a smaller value than the reference heating time A', the standby time B ends before the heating time A elapses. Therefore, the new mold 12 from which the skin body was taken out at the take-out station 22
After this waiting time B has elapsed, the transport path 68 constituting the transport mechanism 28 and the lifting platform 6 of the first lifting station 24
2 to the vicinity of the heating furnace 30. and,
After the heating time A has elapsed, the driving means 34 is stopped, and the mold 12 after heating is transported to the welding station 16 under the action of the transport mechanism 28, while a new mold 12 is transferred to the welding station 16 in the heating furnace. 30.

In this way, in this embodiment, the first heating station 14
By calculating the heating time A at
The waiting time B at is adjusted. As a result, each mold 1
It is possible to adjust the timing of conveying the skin material 2, thereby achieving the effect that the molding work of the skin body can be carried out efficiently.

Furthermore, during the heating operation at the first heating station 14 which takes the longest time, a new mold 12 from which the skin body has been removed at the extraction station 22 is being transported to the vicinity of the heating furnace 30. First heating station 1
It becomes possible to carry a new mold 12 into the heating furnace 30 immediately after the heating operation in step 4 is completed. Therefore, compared to a method in which a new mold 12 is kept on standby at the take-out station 22 and the new mold 12 is transported to the first heating station 14 after the heating operation is completed, unnecessary waiting time can be saved. - A more efficient skin forming operation is achieved.

Next, the mold 12 after heating is transported to the welding station 16 via the transport mechanism 28, and then powdered non-foaming resin is charged into the molding cavity under the action of the resin supply mechanism 36. and the epidermal layer is formed. moreover,
After the powdered foamable resin is supplied to the skin layer under the action of the foamable resin supply mechanism 380 and welded, the conveyor table 11 is rotated 360° under the action of the drive means 40 to remove unnecessary waste inside the mold 12. Foamed resin is discharged to the outside.

The mold 12 transported to the second heating station 18 is
It swings within a predetermined angle range via the driving means 44, and the foamable resin is foamed to form a skin body.

The conveyance table 11 is a lifting table 62 of the second lifting station 26.
and is lowered under the action of the motor 60. At this time, the air blowing means 56 is driven to supply cooling air to the mold 12, and the mold 12 and the skin are gradually cooled.

The conveyance table 11 conveyed to the cooling station 20 via the conveyance mechanism 28 is reversed under the action of the drive means 540, and cooling water is supplied to the outer surface side of the mold 12 through the cooling water supply means 50. This mold 12 is rapidly cooled.

The conveyance table 11 conveyed from the cooling station 20 to the first elevating station 24 is transferred to the conveying path 6 via the elevating table 62.
After being raised to the same height as 8, it is conveyed to the take-out station 22 via this conveyance path 68, and is swung by the driving means 58 to perform the work of taking out the skin body.

Here, the molding device i! 10, molding molds 12 for the crown are conveyed in circulation, and skin bodies are sequentially molded by these molding molds 12.

In this embodiment, the operator may be notified by an alarm or the like that the waiting time B has elapsed, and the operator may drive the control device 29 to transport a new mold 12, or this control device may 29 can also detect the elapse of the standby time B and automatically transport a new mold 12.

[Effects of the Invention] As described above, the method for molding a resin molded article according to the present invention has the following effects and advantages.

Since the heating time of the mold is calculated from the temperature at which the mold is taken out of the furnace, the temperature of the mold before it is brought into the heating furnace, and the temperature inside the heating furnace, it is affected by changes in external conditions, etc. It is possible to always accurately heat the mold to a desired temperature without any trouble, and it becomes possible to obtain a high-quality resin molded body. Moreover, by adjusting the waiting time of the mold carried into the station before the heating station based on this heating time, this waiting time can be shortened as much as possible to efficiently mold the molded product. be able to.

[Brief explanation of drawings]

FIG. 1 is a flowchart for explaining the method for molding a resin molded article according to the present invention, and FIG. 2 is a front explanatory view of a molding device and a control device for implementing the molding method. 10... Molding device 11... Transport table 12... Molding mold 14... Heating station 16... Welding station 18... Heating station 20... Cooling station 22... Taking out station 24. 26... Lifting station 28... Transport mechanism 29... Control device

Claims (2)

[Claims] (1) A molding method for obtaining a molded body from a resin-based molding material by circulating two or more molds between each work station, and the temperature at which the molds are discharged from the heating furnace provided in the heating station. a step of detecting the temperature of the mold before it is carried into the heating furnace; a step of detecting the temperature inside the heating furnace before the mold is carried into the heating furnace; and a step of detecting the temperature of the mold before it is carried into the heating furnace. a step of calculating a heating time for the mold from the detected temperature of the mold before being carried in and the temperature in the heating furnace; 1. A method for molding a resin molded article, the method comprising: adjusting a waiting time of a mold carried into a mold. (2) In the molding method according to claim 1, the waiting time is
A method for molding a resin molded article, characterized in that the method is adjusted so that heating ends before the heating time elapses.