JPH0620894A - Thermal treatment oven - Google Patents

Abstract

PURPOSE:To obtain a thermal treatment oven which is simple in structure and able to thermally treat works in succession without giving them vibrations. CONSTITUTION:Electrode paste is applied to chip parts, a large number of chip parts are held in a holding plate A, and the holding plate A is transferred into a drying oven 1. Vane frames 37 are radially provided to a rotary body 31 which rotates intermittently around a shaft 30, and a pair of inward holding grooves which hold both the sides of the holding plate A slidable in the axial direction of the shaft 30 is provided to each of the vane frames 37. The holding plate A transferred to an inlet/outlet by a conveyer is inserted into the holding grooves by a loading arm. Heating zones are provided inside the oven 1, and the electrode paste is dried up while the rotary body 31 is rotated by a single turn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat treatment furnace such as a drying furnace or a curing furnace, and more particularly to a structure of a furnace for heat treating a plate-shaped work.

[0002]

2. Description of the Related Art Conventionally, a holding plate for elastically holding chip parts has been used in order to simultaneously apply electrodes to the ends of a large number of chip parts (Japanese Patent Publication No. 62-20685).
Issue). This holding plate has a large number of through holes formed in a thin flat plate portion formed in the central portion of a hard substrate, and a rubber-like elastic body is embedded in a recess formed in the flat plate portion,
In addition, a holding hole that penetrates the through hole portion of the elastic body is formed. In order to form the external electrode on the end portion of the chip component by using such a holding plate, the chip component is held in the holding hole so that a part thereof projects upward. Then, while the holding plate is placed on the conveyor and conveyed, the holding plate is passed under a roll coated with the electrode paste. As a result, the electrode paste is applied to the projecting portions of the chip component, and then the holding plate is conveyed below the heating means by the conveyor to heat and dry the electrode paste.

[0003]

In the case of the above heating means, the application of the electrode paste to the drying can be continuously performed on the same conveyor. However, since the heating means is provided in the carrying direction of the holding plate, the installation space is increased and the efficiency of the drying process is poor. Therefore, install a batch type drying oven in the middle of the conveyor, insert a plurality of holding plates conveyed by the conveyor into the drying oven at the same time, perform a predetermined drying process here, and then take it out of the oven. You can also However, in this case, since a certain number of holding plates that have been continuously conveyed on the conveyor are stored and then inserted into the drying furnace, it is necessary to wait the holding plates for a certain period of time, resulting in waste of time. Further, instead of the batch type drying furnace as described above, it is possible to provide a vertical conveyor in the furnace and transfer the holding plates conveyed from the outside one by one to the vertical conveyor for continuous drying.
In this case, since it is not necessary to make the holding plate stand by, there is an advantage that the processing time can be shortened and the installation floor area can be reduced by the vertical conveyor. However, the conveyor structure in the furnace becomes complicated, and the chip parts are likely to be vibrated while being conveyed in the furnace, and the chip parts may fall out from the holding holes of the holding plate. Then, the objective of this invention is providing the heat processing furnace which can process a workpiece | work continuously with a simple structure. Another object is to provide a heat treatment furnace capable of performing heat treatment with almost no vibration applied to a work. Still another object is to provide a heat treatment furnace with high processing efficiency.

[0004]

SUMMARY OF THE INVENTION The present invention comprises a furnace body and a rotating body rotatably arranged in the furnace body, and the rotating body has a plurality of holding means at a constant angle in its rotating direction. Is provided. The rotating body is intermittently rotated by the driving means at an angular pitch between the holding means. A heating means for heating the work is provided inside the furnace body, and an inlet portion and an outlet portion are provided at a portion of the furnace body facing the stop position of the holding means. Further, there are provided a take-in means for inserting the work into the holding means through the inlet part, and a take-out means for taking out the work held by the holding means out of the furnace main body through the outlet part.

[0005]

The unprocessed plate-shaped work is conveyed to the front of the furnace body, and is inserted into the entrance of the furnace body by the intake means. The inlet corresponds to one of the stop positions of the holding means of the rotating body, and the rotating body temporarily stops at that position when the work is taken in. In this way, the work is smoothly inserted into the holding means via the inlet. The work inserted into the holding means rotates in the furnace with the intermittent rotation of the rotating body, and is heat-treated while passing through the heating zone of a predetermined temperature.
When the work after the heat treatment corresponds to the outlet, the rotating body is temporarily stopped here, and the work is taken out of the furnace by the taking-out means. In this way, the rotating body is temporarily stopped after every rotation of one pitch, and the heat treatment is carried out substantially continuously while the work entered from the inlet is conveyed to the outlet.

Since the work is hardly vibrated while the rotating body rotates in the furnace, even if the work is a holding plate holding a large number of chip parts, the chip parts can be prevented from falling off. Further, since the rotating body may have a structure that simply rotates about the axis, the structure is very simple. It is desirable to radially provide a plurality of blade frames on the rotating body and to provide a holding means for holding one work on each of the blade frames, because the rotating body can efficiently hold many works. Further, if a pair of inward and outward inward holding grooves are provided in each blade frame and both sides of the work are held in these holding grooves to rotate about the horizontal axis as a fulcrum, the special clamping means holds the work. There is no danger of falling even without it. In this case, when the work is inserted into the rotary body or taken out from the rotary body, the work only needs to be slid in the horizontal direction, so that the loading and unloading work is simplified and the loading and unloading means are also simplified.

[0007]

EXAMPLE FIG. 1 shows an example in which the heat treatment furnace according to the present invention is used as a drying furnace. In this embodiment, as shown in FIGS. 2 and 3, a holding plate A holding a large number of chip components B is used as a work. A large number of holding holes a ₁ are formed in the holding plate A, and the holes are elastically held in the holes so that part of the chip component B projects downward. After applying an electrode paste such as silver to the protruding portion of the chip part B,
The holding plate A is conveyed to the furnace main body 1 by a reversible driving belt conveyor 2 for loading and unloading, with its electrode coating surface facing downward. The furnace main body 1 is for heating and drying the electrode paste attached to the chip component B.
Doorway 3 that doubles as an entrance and an exit at a position corresponding to
Is provided. The front end of the belt conveyor 2 is inserted into the furnace body 1 via the doorway 3.

At the inlet / outlet 3 portion of the furnace body 1, there are provided a pair of intake arms 10 and an extraction arm 11 constituting the intake means and the extraction means. These arms 10,
As shown in FIG. 4, reference numeral 11 is a parallel to the belt conveyor 2.
The head portion 13 sliding along the slide shaft 12 of the book is horizontally supported by support plates 14 and 15. At the opposing portions of the intake arm 10 and the extraction arm 11, an intake projection 10a and an extraction projection 11a are provided, respectively.
By pressing the rear surface and the front surface of the holding plate A with these projecting pieces 10a and 11a, the holding plate A can be taken in or taken out from the rotating body 31 described later in the furnace body 1.

The intake arm 10 and the support plate 14 are slidably supported on the head portion 13 via a slide bearing 16 so that the intake arm 10 can be moved by driving an air cylinder 17. 4 (b) to the position shown by the chain double-dashed line. When the take-in arm 10 is raised, the position of the take-in protrusion 10a is changed to the belt conveyor 2
Therefore, the holding plate A can pass under the projecting piece 10a.

A motor 19 is fixed to a bracket 18 that supports one end of the slide shaft 12, and a pulley 20 attached to the rotary shaft of the motor 19 and the other end of the slide shaft 12 are supported. A belt 23 is wound around the pulley 22 attached to the bracket 21. A belt 23 is provided below the head portion 13.
A clamp part 24 for clamping a part of the above is provided, and by driving the motor 19, the head part 13, that is, the take-in and take-out arms 10 and 11 can be integrally reciprocated in the front-rear direction.

To take the holding plate A into the rotary body 31 of the furnace body 1, the motor 19 is driven to move the take-in / take-out arms 10 and 11 to the rear end position, that is, the rear stopper portion 13a of the head portion 13 is moved. It is stopped at a position where it abuts on the bracket 21. At this point, the intake arm 10 is located outside the furnace body 1 and is in a position raised by the air cylinder 17. Here, the belt conveyor 2 is driven forward, the holding plate A is passed under the loading arm 10, and stopped at the front end position of the belt conveyor 2, that is, at the intermediate portion of both arms 10, 11. Next, when the air cylinder 17 is driven to lower the intake arm 10, the protruding piece 10a of the intake arm 10 is positioned behind the rear surface of the holding plate A. Then, the motor 19 is driven to drive the intake arm 10
When the take-out arm 11 is moved integrally to the front end position, that is, to the position where the front stopper portion 13b of the head portion 13 abuts on the bracket 18, the holding plate A causes the protruding piece 1 to move.
0a pushes the belt conveyor 2 from the rotating body 3 described later.
1 (see FIGS. 4 (a) and 4 (b)). On the other hand, in order to take out the holding plate A from the furnace body 1, the taking-in arm 10 is raised and the taking-in and taking-out arm 10
11 is moved to the rear end position. As a result, the front surface of the holding plate A is pushed by the projecting piece 11a of the extracting arm 11, and the holding plate A moves from the rotating body 31 to the belt conveyor 2
Transfer to. After that, when the conveyor 2 is driven backward,
The plate A passes under the intake arm 10 and is carried to the next step. The holding plate A is attached to the belt conveyor 2
In order to prevent vibration from being applied to the holding plate A when transferring from the rotating body 31 to the rotating body 31 or from the rotating body 31 to the belt conveyor 2, the holding plate A is synchronized with the strokes of the loading and unloading arms 10 and 11. It is desirable to drive the belt conveyor 2.

In the furnace body 1, as shown in FIGS. 5 and 6, a rotary body 31 rotatable about a horizontal shaft 30, a motor 32 for intermittently rotating the rotary body 31 at a constant pitch, and a furnace interior The plurality of heaters 33a to 33e arranged in the same direction and the fans 34a to 3a for convecting the heat of each heater in the arrow direction of FIG.
4e and 4e are provided. In addition, the fans 34a to 34e
Are driven by fan motors 39a to 39e, respectively.

As shown in FIG. 7, the rotary body 31 has a plurality of blade frames 37 radially fixed to a pair of hubs 36 fixed to a shaft 30 at fixed intervals (1 in FIG. 7). Only one blade frame is shown). Each blade frame 37 is
A pair of vertical frames 37a projecting radially from the hub 36,
It has a pair of horizontal frames 37b fixed vertically to the vertical frame and a cover 37d fixed to one side surface (the upper surface in FIG. 7) of the horizontal frame 37b and closing an opening surrounded by the vertical frame and the horizontal frame. is doing. A pair of inward holding grooves 37c are formed on the opposing surfaces of the horizontal frame. The holding plate A, which is placed on the belt conveyor 2 and carried into the doorway 3, has the loading arm 1
The holding groove 37 of the blade frame 37 corresponding to the doorway 3 by 0
It is inserted in a in the horizontal state. Since the lower surface (projecting surface of the chip component) of the holding plate A inserted into the holding groove 37a is open, the chip component does not come into contact with the blade frame 37, and the air permeability is good.

The motor 32 intermittently rotates the shaft 30 at a constant pitch via a reduction mechanism 38, and the pitch angle is equal to the angle between adjacent blade frames 37 (about 15 ° in this embodiment). Therefore, the blade frame 37 can be accurately stopped at a position corresponding to the doorway 3. In addition,
The stop time of the motor 32 is set to be slightly longer than the sum of the taking-in time and the taking-out time of the holding plate A.

Inside the furnace body 1, there are arched transverse girders 4a, 4b spanning between the left and right side walls, and six partition plates fixed at the same angle as one of the stop positions of the blade frame 37. 5
a to 5f are provided. The cross beams 4a and 4b are close to the outer circumference of the blade frame 37, and the partition plates 5a to 5f are close to both sides of the blade frame 37. The inside of the furnace main body 1 is partitioned into _six zones Z _{1 to} Z ₆ by the cross beams 4a and 4b and the partition plates 5a to 5f. Since the opening of the blade frame 37 is closed by the cover 37d, the blade frame 37
It is little leak hot air between the zones Z ₁ to Z ₆ through.

The holding plate A held by the rotating body 31 passes through the _five heating zones Z _{1 to} Z ₅ while the rotating body 31 rotates 360 °, and the electrode paste adhered to the chip component B during that period. dry. Among the above-mentioned zones, the heating zone Z ₁ near the inlet / outlet 3 has a relatively low temperature, and the heating zone Z ₂ has an intermediate temperature and the heating zone Z in the direction of rotation.
₃ and Z ₄ are adjusted to a high temperature, and the final heating zone Z ₅ is adjusted to an intermediate temperature. The zone HZ ₆ corresponding to the doorway 3 is open to the atmosphere. Thereby, the chip component B can be dried without giving a strong heat shock, and the heat release from the inlet / outlet 3 can be suppressed as much as possible. In addition,
Temperature setting of the heating zone Z ₁ to Z ₅ is not limited to the above can be arbitrarily set by the temperature controller. In addition, each zone Z
The region of _{1 to} Z ₆ and the rotation direction of the rotating body 31 can be arbitrarily changed.

When the holding plate A, which has been dried, corresponds to the entrance / exit 3, the take-out arm 11 is moved to the holding plate A.
Is pulled out onto the belt conveyor 2. Since the belt conveyor 2 can be reversibly driven, it is desirable to drive the belt conveyor 2 backward in synchronization with the stroke of the take-out arm 11. The holding plate A transferred to the belt conveyor 2 is reversely conveyed and transferred to the next step (not shown). After the dried holding plate A is transferred to the next step, the next holding plate A before drying is carried into the furnace body 1 by the belt conveyor 2 and inserted into the rotating body 31 by the loading arm 10. It The rotating body 31 stops rotating after the dried holding plate A is taken out and before the holding plate A before drying is taken in.

FIG. 8 shows a second embodiment of the present invention. In the first embodiment, the electrode paste was dried while the rotating body 31 was rotated by 360 °, and the inlet and the outlet were shared by the single inlet / outlet 3, whereas in the present embodiment, the inlet 41 and the outlet 42.
Are provided at 180 ° symmetrical positions on the front side of the drying furnace 40, and the electrode paste is dried while the rotating body 43 rotates 180 °. In addition, 44 is a rotating shaft and 45 is a motor. The entrance 41 is provided with an intake conveyor 46 and an intake arm 47, and the exit 42 is provided with an intake conveyor 4
8 and an extraction arm 49 are provided. The internal structure of the drying furnace 40 is almost the same as that of the first embodiment (see FIG. 5), but the lower half of the furnace is not provided with heating means.

In this case, the lower half of the oven cannot be effectively used as compared with the drying oven of the first embodiment, but the holding plate A is taken in from the inlet 41 with the electrode coating surface facing downward.
However, since it is taken out upward from the outlet 42, there is an advantage that the finish of the electrode can be easily confirmed. Further, since the inlet 41 and the outlet 42 are separately provided and the holding plate A can be taken in and taken out in synchronization, there is an advantage that the time required for taking in and taking out can be shortened.

FIG. 9 shows a third embodiment of the present invention. In this embodiment, a shaft 51 is horizontally rotatably supported inside a furnace body 50, and a polygonal drum type rotary body 52 is fixed to the shaft 51. On each outer peripheral surface of the rotating body 52, a pair of holding groove holding grooves 53 for holding both side portions of the plate-shaped workpiece W are provided. Then, a heater 54 is provided inside the furnace main body 50 facing each outer peripheral surface of the rotating body 52, and the work W is heated by the radiant heat of the heater 54. In this case, the entrance / exit 55 is provided at the lowermost end of the rotating body 52, and the work W can be inserted into or taken out from the holding groove 53 in the horizontal state via the entrance / exit 55. The work W can be taken in and taken out from the holding groove 53 by using the same take-in arm and take-out arm (not shown) as in the above-described embodiment.

It goes without saying that the above-mentioned embodiments show only a few examples of the present invention and can be variously modified without departing from the spirit of the present invention. For example, in the case of the first to third embodiments, the inlet and the outlet are provided only on the same side (front side) of the furnace, but they may be provided on both front and back sides. That is, the work may be taken in from the front side and taken out from the back side. However, as in the above-mentioned embodiment, the conveyors can be arranged on one side of the furnace if they are provided only on the same side, so that the space occupied by the apparatus can be reduced. Further, the heat treatment furnace of the present invention is not only used for the step of drying the electrode paste of the chip component B held by the holding plate A as in the above embodiment, but can be used for other purposes. Further, the work is not limited to the holding plate as shown in FIGS. 2 and 3, and for example, Japanese Patent Application No. 3-1 previously proposed by the applicant of the present application.
It may be a holder as described in No. 26597. Incidentally, FIG. 2, to hold the holding plate shown in FIG. 3, when the groove a ₂ longitudinal direction on both sides of the plate is provided, the rail engages with the groove a ₂ provided as a holding means May be. Further, the rotary shaft of the rotating body is not limited to being supported in the horizontal direction, but may be supported in the vertical direction. In the case of the vertical direction, there is an advantage that the posture of the work does not change depending on the rotation position of the rotating body.

[0022]

As is apparent from the above description, according to the present invention, a plurality of plate-shaped works are held by the holding means of the rotating body, and the rotating body is heated while being intermittently rotated. Can be continuously heat-treated, and almost no vibration is applied to the work during heat-treatment. Further, since the rotating body only needs to be intermittently rotated in the furnace, the driving mechanism becomes very simple. Further, if the blade frame is radially provided on the rotating body and the holding groove for slidably holding both sides of the work is provided on the blade frame, it is necessary to provide a special means for clamping the work on the blade frame. The structure is further simplified. Further, since the work carried in in the horizontal state can be inserted into the holding means in the same posture and taken out from the holding means in the horizontal posture, the taking-in means and the taking-out means can be simplified.

[Brief description of drawings]

FIG. 1 is a perspective view of an example in which the present invention is applied to a drying furnace.

FIG. 2 is a perspective view of an example of a holding plate used in the present invention.

FIG. 3 is a sectional view of a holding plate.

FIG. 4 (a) is a plan view of the loading / unloading means, and FIG. 4 (b) is a front view thereof.

5 is a sectional view taken along line VV of FIG.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a perspective view of a rotating body.

FIG. 8 is a cross-sectional view showing the internal structure of the second embodiment of the present invention.

FIG. 9 is a vertical sectional view showing the internal structure of the third embodiment of the present invention.

[Explanation of symbols]

 1 Furnace Main Body 2 Intake / Eject Conveyor 3 Inlet / Outlet 10 Intake Arm 11 Outtake Arm 30 Shaft 31 Rotating Body 32 Motor 33 Heater 37 Blade Frame 37c Holding Groove A Holding Plate (Work)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiko Ogame 2-26-10 Tenjin Tenjin, Nagaokakyo, Kyoto Prefecture Murata Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. A furnace for heat-treating a plate-shaped work, a furnace body, a rotating body rotatably arranged in the furnace body, and a plurality of rotating bodies provided at fixed angles in a rotation direction of the rotating body. A holding means for holding the work, a driving means for intermittently rotating the rotating body at an angle pitch between the holding means, and a heating means for heating the work held in the holding means provided inside the furnace body. Means, an inlet portion and an outlet portion provided at a portion of the furnace body facing at least one stop position of the holding means, an intake means for inserting a work into the holding means through the inlet portion, And a take-out means for taking out the work held by the holding means from the furnace main body through the outlet portion. 2. The heat treatment furnace according to claim 1, wherein the rotating body has a rotating shaft rotatably supported by the furnace body at an axial center portion of the rotating body, and the holding means radially protruding from the rotating shaft. And a plurality of blade frames each having a heat treatment furnace. 3. The heat treatment furnace according to claim 2, wherein the rotating shaft is rotatably supported by the furnace body in a horizontal posture.
The heat treatment furnace characterized in that the holding means is composed of a pair of inward holding grooves for holding both sides of the work slidably in the axial direction of the rotating body.