JP2836913B2 - Mold temperature control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a temperature control method for controlling a mold temperature of a slush molding die.

[Related Art] For example, a skin body formed by slush molding using a resin-based molding material is used as an interior body in which an instrument panel of an automobile is incorporated.

In this case, in the slush molding, a step of pre-heating the molding die, a step of charging a molding material such as plastisol or powder made of vinyl chloride into the heated molding die, and a step of discharging excess molding material, There is a step of further heating the mold, a step of cooling the heated mold, a step of removing the skin from the mold, and the like, and the skin is formed by sequentially transporting the mold between the steps. I have.

[Problems to be Solved by the Invention] By the way, in order to efficiently and mass-produce the skin body, for example, the molding die is heated for a preset time while the amount of heat from the heating burner is kept constant. Has been considered in which the material is heated to a desired temperature in a short time. However, due to the characteristics of the mold itself, for example, the structure of the thickness of each part of the mold due to the production characteristics of the mold made of nickel electroforming, differences in processing conditions in the cooling process, changes in the outside air temperature, etc. Therefore, the mold is not always heated to a constant temperature in each part, and there is a problem that temperature unevenness occurs and the thickness and quality of the skin body vary.

On the other hand, also in the cooling step, it is similarly difficult to always cool the mold to a constant temperature, which causes a problem that the mold cannot be heated to a desired temperature in the above-described heating step.

The present invention solves this kind of problem, and efficiently and accurately adjusts the mold to a desired temperature without being affected by differences in the characteristics of the mold itself and changes in external conditions. It is an object of the present invention to provide a method of controlling the temperature of a mold that is possible.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a method for transferring a mold between each work station, heating the mold at a heating station, A resin-based molding material is supplied and welded, and the mold is further cooled at a cooling station to control a mold temperature of a mold for molding a molded body. A step of setting a temperature (T1) of unloading the mold from a heating furnace provided in a station; a step of detecting a temperature (T2) of the mold before being carried into the heating furnace; A step of detecting a temperature (T3) in the heating furnace before, a temperature of the set-out furnace (T1) of the molding die, a detected temperature (T2) of the molding die before carrying in, and the heating The temperature inside the furnace (T3) and the controller Based on an arithmetic expression stored in the controller, the heating time of the mold is calculated from the temperature of the discharge furnace (T1), the temperature of the mold (T2), and the temperature of the heating furnace (T3). (S) calculating; and starting the time counting by the control device and heating the mold for the calculated heating time (S).

Further, the present invention further comprises transferring the molding die between the work stations, heating the molding die at a heating station, then supplying and welding a resin-based molding material into the molding die, and further forming the molding die. A mold temperature control method for controlling a mold temperature of a mold for molding a molded body by cooling the mold at a cooling station, comprising: setting a cooling temperature (T1a) of the mold; Detecting the temperature (T2a) of the molding die before being brought into the cooling chamber provided in the cooling chamber; and temperature (T3a) of the cooling medium guided into the cooling chamber.
Controlling the cooling temperature (T1a) of the set mold and the detected temperature of the mold before loading (T2a) and the temperature of the cooling medium (T3a). The cooling temperature (T1a), the temperature of the molding die (T2a), and the temperature of the cooling medium (T3a) are input to the device and based on an arithmetic expression stored in the control device. A step of calculating a cooling time (Sa); and a step of starting time measurement by the control device and heating the mold for the calculated cooling time (Sa).

[Operation] In the method of controlling the temperature of a molding die according to the present invention, the temperature of the molding die before being carried into a heating furnace provided in a heating station, the temperature of the molding die beforehand, Since the heating time of this mold is calculated from the temperature in the heating furnace before carrying in, the mold is not affected by differences in the characteristics of the mold itself, changes in cooling conditions, and the like. Can be heated to temperature.

Further, in the mold temperature control method according to the present invention, the cooling temperature of the mold set in advance, the temperature of the mold before being carried into the cooling chamber provided in the cooling station, and the temperature is led out into the cooling chamber. Since the cooling time of the mold is calculated from the temperature of the cooling medium, the mold is always cooled to a desired temperature without being affected by differences in the characteristics of the mold itself or changes in the outside air temperature. be able to.

[Example] An example of a method of controlling the temperature of a mold according to the present invention will be described in detail below with reference to the accompanying drawings in connection with a molding apparatus for performing the method.

In FIG. 2, reference numeral 10 indicates a molding apparatus for performing the method of controlling the temperature of a molding die according to the present embodiment. The molding apparatus 10 supplies a resin-based molding material to the first heating station 14 for heating the molding die 12 fixed to the carrier 11 to a desired temperature, and welds the resin-based molding material to the heated molding die 12. A welding station 16 for discharging unnecessary molding material afterwards;
A second heating station for heating the welded molding material
18, a cooling station 20 for cooling the mold 12,
A take-out station 22 for taking out a skin (molded body) from the mold 12 after cooling is completed, and a first heating station 1
4, welding station 16 and second heating station 18
First and second elevating stations 24 and 26 for forming a two-stage structure with the cooling station 20;
A transfer mechanism 28 capable of circulating and transferring the molding die 12 is provided between the control device 29 and the 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 forming die 12.
Is provided. The heating furnace 30 is provided with a temperature detection sensor (not shown) for detecting 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 38 for molding a foam layer on the skin layer.
And a driving unit 40 for rotating the molding die 12.

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

Shutters 48a to 48d that engage cylinders 46a to 46d are provided at the entrances and exits of the first heating station 14, the welding station 16 and the second heating station 18, respectively.

The cooling station 20 has a cooling chamber 52 in which a cooling water supply means 50 is accommodated, and the molding die 12
And a temperature detecting sensor (not shown) for detecting the temperature of the cooling water (cooling medium) drawn into the cooling chamber 52. An air blow means 56 is disposed between the cooling station 20 and the second heating station 18 to gradually cool the skin.

The removal station 22 is provided outside the circulating conveyance path of the molding apparatus 10 and has a driving unit 58 for swinging the molding die 12 to remove the skin from the molding die 12.

The first and second lifting stations 24 and 26 are provided with a motor 60.
The transport belts 64 and 66 which constitute the transport mechanism 28 and are arranged vertically in parallel with each other, and the lift platform 62 form an annular transport path. The transfer mechanism 28 has a transfer path 68 arranged at the unloading station 22, and the transfer path 68 moves the mold 12 between the unloading station 22 and the elevating table 62.

Immediately before the cooling station 20 and at the first elevating station 24, a radiation thermometer (not shown) is provided for detecting the temperature of the mold 12 and controls the temperature information of the mold 12. Supply to device 29.

Next, the operations of the molding device 10 and the control device 29 configured as described above will be described below with reference to the flowchart of FIG. 1 in relation to the temperature control method according to the present embodiment.

The discharge temperature T1 of the molding die 12 from the heating furnace 30 provided in the first heating station 14 is set based on characteristic data such as the material and shape of the molding die 12 and supplied to the control device 29.

The temperature T2 of the molding die 12 before being carried into the heating furnace 30 is detected by a radiation thermometer provided in the first elevating station 24 and supplied to the control device 29.

The temperature T3 in the heating furnace 30 before the molding die 12 is carried in,
Control device detected via a temperature detection sensor (not shown)
Supplied to 29.

Through the temperature information relating to the set outlet temperature T1 of the forming die 12 and the detected temperature T2 of the forming die 12 before carrying in and the temperature T3 in the heating furnace 30, the control device 29 controls the forming die. Twelve heating times S (seconds) are calculated. The heating time S is obtained from the following equation.

S = α × T2 + β × T3 + γ × T1 + K Here, α, β, γ, and K take a large number of data sets of T1, T2, T3, and S as a set, and based on this data, determine the most Selected to an appropriate value.

Here, when α = −0.8, β = −0.1, γ = 0.3, and K = 200, the heating time S becomes a value shown in the following Table 1.

In this case, Example 1 shows the heating time S at general temperatures T2 and T3, Example 2 shows the case where the mold 12 is low temperature and the heating time S is long, and Example 3 3 shows a case where the temperature T3 is high and the heating time S is short.

As a result, the temperature T2 of the mold 12 immediately before being carried into the heating furnace 30 is
In addition, even if the temperature T3 in the heating furnace 30 changes due to fluctuations of various external conditions, the heating time S is easily calculated, and the mold 12 is always heated to the desired discharge temperature T1 (220 ° C.). be able to. Therefore, an effect is obtained that a high-quality skin can be efficiently molded by the molding operation described later.

Next, a brief description will be given of the molding operation of the skin body. The molding die 12 transferred into the heating furnace 30 of the first heating station 14 rotates integrally with the transfer table 11 via the driving means 34. While being heated through the burner 32. that time,
Timing is started by the control device 29, and the mold 12 is heated for a predetermined heating time S.

After the heating is completed, the molding die 12 is transferred to the welding station 16 via the transfer mechanism 28, and then, first, a powdery non-foamable resin is charged into the molding cavity under the action of the resin supply mechanism 36, and the surface is covered. A layer is formed. Further, after the powdery foamable resin is supplied to the skin layer and welded under the action of the foamable resin supply mechanism 38, the transfer table 11 is acted upon by the drive means 40.
Rotates 360 °, and unnecessary foaming resin in the mold 12 is discharged to the outside.

The mold 12 conveyed to the second heating station 18 swings within a predetermined angle range via the driving means 44, and the foamable resin foams to form a skin.

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

The transfer table 11 transferred to the cooling station 20 via the transfer mechanism 28 is inverted under the action of the driving unit 54, and the cooling water is supplied to the outer surface side of the molding die 12 via the cooling water supply unit 50. The mold 12 is rapidly cooled.

The transfer table 11 transferred from the cooling station 20 to the first lifting station 24 is raised to the same height as the transfer path 68 via the lift table 62, and then transferred to the unloading station 22 via the transfer path 68 and driven. The work is taken out of the epidermis by being rocked by the means 58.

Here, three molding dies 12 are circulated and conveyed to the apparatus 10, and the skins are sequentially molded by these molding dies 12.

Next, a method of controlling the temperature of a mold according to another embodiment of the present invention will be described below using the cooling station 20 of the control device 10.

The cooling temperature T1a of the mold 12 cooled in the cooling station 20 is set based on the characteristic data of the mold 12 and the like, and is supplied to the controller 29.

The temperature T2a of the molding die 12 before being carried into the cooling chamber 52 is detected by a radiation thermometer (not shown) disposed immediately before the cooling chamber 52 and supplied to the control device 29.

The temperature T3a of the cooling water discharged into the cooling chamber 52 is detected via a temperature detection sensor (not shown) and supplied to the control device 29.

The set cooling temperature T1a of the molding die 12, the detected temperature T2a of the molding die 12 before carrying in and the temperature T of the cooling water detected.
The cooling time Sa of the molding die 12 is calculated by the control device 29 via the temperature information relating to 3a. This heating time Sa is
The heating time S of the molding die 12 is calculated using the same equation as the above equation.

As a result, the mold 12 can always be accurately cooled to a desired temperature, the quality of the skin is prevented from deteriorating, and the heating operation of each mold 12 in the heating station 14 can be efficiently performed. There is.

[Effects of the Invention] As described above, the method for controlling the temperature of a mold according to the present invention has the following effects and advantages.

Since the heating time of the mold is calculated from the preset mold discharge temperature, the temperature of the mold before being carried into the heating furnace, and the temperature in the heating furnace, the characteristics of the mold itself are calculated. This mold can always be heated to a desired temperature without being affected by differences or changes in cooling conditions. This makes it possible to efficiently mold a high-quality molded body.

Furthermore, in the mold temperature control method according to the present invention, the preset cooling temperature of the mold, the temperature of the mold before being carried into the cooling chamber, and the temperature of the cooling medium drawn out into the cooling chamber. Since the cooling time of this mold is calculated from
The mold can be constantly cooled to a desired temperature.

[Brief description of the drawings]

FIG. 1 is a flowchart for explaining a method of controlling the temperature of a molding die according to the present invention, and FIG. 2 is a front explanatory view of a molding device and a control device for performing the temperature control method. 10 Molding equipment 11 Carrying table 12 Mold 14 Heating station 16 Welding station 18 Heating station 20 Cooling station 22 Unloading station 24, 26 Lifting station 28 Transport mechanism 29 ... Control device

Continued on the front page (72) Inventor Toru Yamamoto 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (72) Inventor Noboru 1-1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (72) Inventor Kenji Saeki 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) B29C 41/00-41/52 B29L 31: 58

Claims (2)

(57) [Claims] 1. After the mold is heated at a heating station by transferring the mold between the work stations, a resin-based molding material is supplied and welded into the mold.
A mold temperature control method for controlling a mold temperature of a mold for cooling the mold at a cooling station to form a molded body, wherein the mold is heated from a heating furnace provided at the heating station. Setting the discharge temperature (T1) of the mold, detecting the temperature (T2) of the mold before carrying the mold into the heating furnace, and measuring the temperature (T3) of the heating furnace before carrying the mold into the furnace. Detecting the temperature of the mold (T1) and the detected temperature of the mold (T2) and the temperature (T3) of the heating furnace before carrying in the molding furnace, And the heating of the molding die from the temperature of the furnace (T1), the temperature of the molding die (T2) and the temperature of the heating furnace (T3) based on the arithmetic expression stored in the control device. Calculating the time (S), and starting the time measurement by the control device Te, the mold temperature control method characterized by having a the steps of heating the only mold the computed heating time (S). 2. The method according to claim 1, wherein the mold is transferred between the work stations so that the mold is heated at a heating station, and then a resin-based molding material is supplied and welded into the mold.
A method of controlling the temperature of a mold for controlling a mold temperature of a mold for molding a molded article by cooling the mold in a cooling station, comprising: setting a cooling temperature (T1a) of the mold. A step of detecting a temperature (T2a) of the molding die before being carried into a cooling chamber provided in the cooling station; a step of detecting a temperature (T3a) of a cooling medium guided into the cooling chamber; The set cooling temperature of the mold (T1a) and the detected temperature of the mold before the carry-in (T2a) and the temperature of the cooling medium (T3a) are input to the control device,
The cooling time (Sa) of the molding die is calculated from the cooling temperature (T1a), the temperature of the molding die (T2a) and the temperature of the cooling medium (T3a) based on an arithmetic expression stored in the control device. And a step of starting time measurement by the control device and heating the mold for the calculated cooling time (Sa).