JP2758959B2 - Heating equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating apparatus which can be suitably used in a reflow furnace or the like for reflowing and soldering cream solder after mounting electronic components on a circuit board.

Conventional technology Conventionally, cream solder applied to a circuit board (hereinafter abbreviated as a board) is heated by an electronic component and then reflowed by heating. The reflow furnace uses heating by hot air, heating by infrared rays, or steam latent heat. Various heating methods such as heating are adopted.

Among them, for example, as disclosed in Japanese Patent Application Laid-Open No. 63-278668, a heating device that blows hot air at a constant temperature with a relatively uniform wind speed over the entire surface of a substrate has a running cost and uniform heating. It is attracting attention from the viewpoints of productivity and productivity.

However, in the above configuration, the amount of heat supplied by the hot air is uniform over the entire surface of the substrate, but various electronic components and mechanical components are mounted on the substrate at different densities for each part. Therefore, there is a problem that the heat capacity distribution of the substrate varies, and if the amount of supplied heat is made uniform, the temperature distribution of the substrate varies as shown in FIG.

Accordingly, the present applicant has previously described the substrate 21 as shown in FIG.
A heating device has been proposed in which a large number of hot air blowing nozzles 23 each having a built-in heating means are arranged above and below the transfer path 22 so that the temperature of the hot air blown from each hot air blowing nozzle 23 can be controlled individually. In FIG. 8, reference numeral 24 denotes a blower fan, reference numeral 25 denotes a heater, and reference numeral 26 denotes a hot-air supply space for supplying hot air heated by the heater 25 to each hot-air blowing nozzle 23. However, even in the heating device having such a configuration, the temperature distribution of the heating portion 27 heated by the hot air blown from each hot air blowing nozzle 23 becomes a mountain shape as shown in FIG. It has been found that there is a problem that a considerably large temperature difference occurs in the peripheral portion.

The present invention has been made in view of the above-described conventional problems, and has as its object to provide a heating device that can arbitrarily adjust the amount of heat supplied to each heating portion in a heating region and has a uniform temperature distribution in each heating portion.

Means for Solving the Problems To achieve the above object, the present invention arranges a hot air blowing means provided with a heating means in opposition to each heating portion set by dividing a heating area into a matrix, The heating means of the hot air blowing means are individually controllable, and a hood having an open end opposed to almost the entire heating portion is attached to the blowing end of each hot air blowing means.

Preferably, each hot air blowing means is formed of a cylinder having a heating means, and an opening of the cylindrical body opposite to the hot air blowing side is connected to a common heated gas supply space.
Further, a cylinder for blowing out the heated gas in the heated gas supply space is disposed around the hot air blowing means group.

According to the above configuration of the present invention, since it is possible to heat each heating portion with the hot air blown out from the hot air blowing device having individually controllable heating means, the amount of heat supplied to each heating portion can be individually determined. Even if the heat capacity differs between the heating parts, it can be heated to a uniform temperature, and if necessary, it can be controlled to an arbitrary temperature for each heating part, and the opening end faces almost the entire surface of the heating part. Since the hood is provided, the temperature distribution at each heating portion becomes uniform.

In addition, by supplying hot air to each hot air blowing means from a common heating gas supply space, each hot air blowing means only needs to adjust the temperature between the heating portions. Accurate and responsive operation can be performed. Furthermore, by blowing out the heating gas in the heating gas supply space around the heating area,
The inside of the heating area can be thermally isolated from the external space, and the temperature can be controlled accurately even in the peripheral part of the heating area.

Embodiment Hereinafter, a heating apparatus according to an embodiment of the present invention will be described with reference to FIGS.

1, 3 and 4, reference numeral 1 denotes a heating area in the heating device, and a substrate 2 which is an object to be heated is carried in and properly positioned by a transport means. The heating region 1 is divided into a matrix shape and a plurality of square heating portions 3 are formed.
Are formed. Hot air blowing means 4 is provided corresponding to each of the heating portions 3, and is configured to blow hot air to each of the heating portions 3 to heat them. A hood 5 is mounted at the tip of the hot-air blowing means 4 so that the opening end of the hood 5 is close to the entire surface of the heating portion 3 and opposes it.

As shown in detail in FIGS. 5 and 6, each hot air blowing means 4 has a heating means 8 such as a plurality of sheathed heaters on a peripheral wall portion of a cylindrical body 6 having a hot air blowing hole 7 formed at a central portion. It is arranged so as to be parallel to the axis. The heating means 8 is configured to be able to control the operation of each of the hot air blowing means 4 individually.
Further, a temperature detecting means 9 is mounted along the outer peripheral portion of the cylindrical body 6, and the detecting end 9 a is disposed so that the detecting end 9 a faces the outlet of the blow hole 7. The heating means 8 is operated by a control means (not shown) based on the temperature detected by the temperature detecting means 9 and a predetermined set temperature.

As shown in FIGS. 1 and 3, these hot air blowing means 4 are fixed to a support plate 10 arranged in parallel with the heating area 1 at an end of the cylindrical body 6 opposite to the hot air blowing end. Supported.
As shown in FIG. 3, a heating gas supply space 11 is defined by a support plate 10, and an inlet of a blow hole 7 of the cylindrical body 6 is opened in the heating gas supply space 11. A fan 12 is provided on one side of the heating gas supply space 11 so as to send the heating gas sucked from the heating region 1 into the heating gas supply space 11, and an inlet to the heating gas supply space 11. Is provided with heating means 13.

In addition, as shown in FIGS. 3 and 4,
A heating gas blowing cylinder 14 is provided around the heating area 1 so as to blow the heating gas in the heating gas supply space 11.

In the above configuration, when the fan 12 is driven, the heating gas is sucked from the heating area 1, heated to a predetermined temperature by the heating means 13, and sent into the heating gas supply space 11. The heated gas passes through the blowing holes 7 of the hot air blowing means 4, is appropriately heated as necessary by the heating means 8, is turned into a hot air of a predetermined temperature, is blown out from its outlet, and is discharged through the hood 5 through the hood 5. Each heating part 3 of the heating area 1 is sprayed on the heating part 3.
The hot air of the temperature set separately for each is blown. Therefore, even when the heat capacity differs between the heating portions 3, 3,..., The heating can be performed at a uniform temperature, and the heating portion 3 can be controlled to an arbitrary temperature as needed. Further, the hood 5 whose open end faces almost the entire surface of the heating portion 3
Are provided, as shown in FIG. 2, the distribution of the temperature T in each heating portion 3 becomes uniform.

Further, a common heating gas supply space 11 is provided for each hot air blowing means 4.
Since the heating gas is supplied from the hot air blower, only the temperature adjustment between the respective heating portions 3 needs to be performed in each hot air blowing means 4, so that the configuration can be made compact and the temperature control can be performed with high accuracy and responsiveness.

Further, since the heating gas in the heating gas supply space 11 is blown out from the heating gas blowing cylinder 14 around the heating region 1, the inside of the heating region 1 is thermally shut off from the external space, and However, accurate temperature control can be performed.

Effect of the Invention According to the present invention, each heating portion can be heated by hot air blown from a hot air blowing device having individually controllable heating means, so that the amount of heat supplied to each heating portion is individually controlled. Even if the heat capacity differs between the heating parts, it can be heated to a uniform temperature, and if necessary, it can be controlled to an arbitrary temperature for each heating part, and the hood whose open end faces almost the entire surface of the heating part Providing such an effect exerts an effect that the temperature distribution in each heating portion can be made uniform.

Also, by supplying the hot air from the common heating gas supply space to each hot air blowing means, each hot air blowing means only needs to adjust the temperature between the heating parts, so that it is possible to configure compactly and accurately control the temperature. In addition, it is possible to perform the operation with good responsiveness. Further, by blowing out the heating gas in the heating gas supply space around the heating region, the inside of the heating region can be thermally shut off from the external space, and the periphery of the heating region The effect that the temperature control with high accuracy can be performed even in the section is exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a heating device according to an embodiment of the present invention, FIG. 2 is an explanatory view of the operation, FIG. 3 is a partially longitudinal front view of the same, FIG. FIG. 6 is a cross-sectional plan view of the hot air blowing means, FIG. 6 is a vertical sectional view taken along the line VI-VI of FIG.
FIG. 8 is a temperature distribution diagram in which the temperature distribution when the substrate is uniformly heated is divided into a matrix and displayed. FIG. 8 is a vertical sectional front view showing a schematic configuration of the previously proposed heating device. FIG. It is an operation explanatory view. DESCRIPTION OF SYMBOLS 1 ... Heating area 3 ... Heating part 4 ... Hot air blowing means 5 ... Hood 6 ... Cylindrical body 7 ... Blowing hole 8 ... Heating means 11 ... Heated gas supply space 14 ... Heated gas blowing cylinder.

Continuation of front page (56) References JP-A-2-303674 (JP, A) JP-A-63-144866 (JP, A) JP-A-64-11070 (JP, A) JP-A-3-6890 (JP) (A) JP-A-3-8565 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23K 1/008 B23K 3/04 H05K 3/34

Claims (3)

(57) [Claims] 1. A hot air blowing means provided with a heating means is arranged to face each heating portion which is set by dividing a heating area into a matrix, and the heating means of each hot air blowing means can be controlled separately. A heating device characterized in that a hood whose opening end faces substantially the entire heating area is attached to the blowing end of each hot air blowing means. 2. The method according to claim 1, wherein each of the hot air blowing means is constituted by a cylindrical body provided with a heating means, and an opening of the cylindrical body opposite to the hot air blowing side is connected to a common heating gas supply space. The heating device according to claim 1. 3. The heating device according to claim 2, wherein a cylinder for blowing out the heating gas from the heating gas supply space is disposed around the hot air blowing means group.