JP2006321684A - Furnace to produce bottomed pipe by heating vacuum moulding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a furnace to produce a high quality bottomed pipe by heating vacuum molding. <P>SOLUTION: A tubular heating element 26 is arranged in a vertically raised state in a casing 19 whose inner surrounding walls are covered with insulating materials 23, 24 and 25 and is divided vertically to two tubular heating elements 26a and 26b which are connected respectively to temperature controllers 31a and 31b by wires 21a-2 and 21b-2. Temperature measuring elements 29a and 29b which are connected to the temperature controllers 31a and 31b by wires 21a-1 and 21b-1 are inserted inside. The raw material 22' of the bottomed pipe 22 for heating vacuum molding is inserted from a bottom inserting port 32. The whole outer peripheral surface of the tubular heating element 26 is covered with an insulating material 27 and an air space 28 is formed between the outer periphery of the insulating material 27 and the insulating material 23 at the inner surrounding walls of the casing 19. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a furnace for heating and vacuum forming a bottomed tube.

  In recent years, when measuring the contents collected in a test tube, instead of observing the change caused by the introduction of a reagent as in the past, the light is irradiated with a specific wavelength and the change is converted into data quickly. There are many things that can easily measure the contents collected.

In order to use the irradiation light efficiently in such a measurement, it is necessary to mold a cuvette (cuvette: a small and transparent tubular laboratory container), which has been mainly used in the past, into a square shape. A heating vacuum forming method is known as a forming method. (For example, refer to Patent Document 1.)
FIG. 6 is a side sectional view of a heating vacuum forming furnace for heating and vacuum forming such a conventional bottomed tube (square cuvette), and FIG. 7 is a sectional view taken along line AA ′ of FIG. (Plan sectional view).

  As shown in FIGS. 6 and 7, the inner surface of the bottomed square-shaped heating furnace 1 is covered with a heat insulating wall 2 on the periphery and bottom surface side, and the opening side is composed of a lower heat insulating lid 3 and an upper heat insulating lid 4. It is covered with a heavy insulating lid.

  Inside the heating furnace 1, a total of twelve quartz tubes 5 arranged in four rows and three rows are arranged in an upright state. The quartz tube 5 has a lower end opening that directly penetrates the bottom surface of the heating furnace 1 through the heat insulation wall 2 on the bottom side of the heating furnace 1, and an upper end opening that penetrates the lower heat insulation lid 3 and is an upper insulation. It is in contact with the lid 4 and communicates with the outside through a hole functioning as an insertion port 6 formed in the upper heat insulating lid 4.

Further, on the heat insulating wall 2 on the bottom surface side of the heating furnace 1, a rod-like heater 7 extending so as to lie in a direction orthogonal to the quartz tube 5 is disposed so as to sandwich the quartz tube 5.
In the above configuration, the bottomed tube material 8 containing a cored bar (not shown) is inserted into the quartz tube 5 heated by the heat radiation of the rod heater 7 from the bottom side through the insertion port 6. The upper end portion on the opening side of the bottomed tube material 8 is connected to a vacuum pump (not shown), so that the inside of the bottomed tube material 8 being molded maintains a negative pressure.

The bottomed tube material 8 inserted into the quartz tube 5 is heated and softened by the quartz tube 5. The softened bottomed tube material 8 is pressed against a core bar (not shown) due to a pressure difference between the inside and the outside, and is molded according to the outer shape of the core bar (not shown).
Japanese Patent No. 2758974

In the heating furnace 1 for conventional heat vacuum forming described above, the bottomed tube material 8 is placed in a heated quartz tube 5 which is a radiator, and heat vacuum forming is performed.
However, the quartz tube 5 can only have a constant temperature portion distribution in the vertical direction, which causes a problem that causes deterioration of the quality of the bottomed tube that is a product to be heated and vacuum formed. .

  Further, the quartz tube 5 is sandwiched between two rod heaters 7 that are heating elements, and a temperature difference occurs between a portion 5 b that is in contact with the rod heater 7 and a portion 5 b that is not in contact with the rod heater 7. This temperature difference in the circumferential direction has an effect, and in this respect as well, there remains a problem that the quality of the product to be vacuum-formed is deteriorated.

  Furthermore, since a plurality of bottomed tube materials 8 are formed by heating a plurality of quartz tubes 5 in the same environment by the rod heater 7, a plurality (12 in the example of the figure) of the bottomed tube materials 8 are formed. However, there is a problem that even if it is desired to change the molding temperature condition for each one, it cannot be changed.

  In view of the above-described conventional situation, an object of the present invention is to provide a furnace for heating and vacuum forming a bottomed tube with high quality.

Below, the structure of the furnace for carrying out the heating vacuum forming of the bottomed tube concerning this invention is described.
First, a furnace for heating and vacuum forming a bottomed tube according to a first aspect of the invention has a tubular heating element arranged so that one end communicates with the outside in the furnace, and the bottomed tube material is formed into the tubular shape from the outside. In a furnace for inserting into the inside of a heating element and performing heating vacuum forming, the temperature of each of the divided tubular heating elements divided into at least two divided tubular heating elements in the vertical direction for forming the tubular heating element is set. It has a temperature measuring element to be measured and a temperature controller for adjusting the temperature of each of the divided tubular heating elements, and is configured to control the vertical temperature distribution in the tubular heating element.

The tubular heating element is configured such that, for example, the outer peripheral surface thereof is covered with a heat insulating material.
Next, the furnace for heating and vacuum forming the bottomed tube of the second invention has a plurality of tubular heating elements arranged so that one end communicates with the outside in the furnace, and the bottomed tube from the outside In a furnace for performing heat vacuum forming by inserting a material into the tubular heating element, a heat insulating material that covers the outer peripheral surface of the tubular heating element, and a plurality of parts that are divided into at least two parts in the vertical direction to form the tubular heating element A divided tubular heating element, a temperature measuring element for measuring the temperature of each of the divided divided tubular heating elements, and a temperature controller for adjusting the temperature of each of the divided tubular heating elements. It is configured to control the temperature distribution in the vertical direction in the body.

  A furnace for heating and vacuum forming the bottomed tube is, for example, a method in which the plurality of tubular heating elements are aligned with a one-way plane on the side communicating with the outside, and an air layer is provided between the heat insulating materials. Configured to be interior.

  In this case, the temperature measuring element and the temperature controller are configured to individually control the temperature of the plurality of tubular heating elements arranged, for example.

  According to the heating vacuum forming furnace of the present invention, the bottomed tube material can be uniformly heated in the circumferential direction and the axial direction, so that high-quality heating vacuum forming is possible.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external front view of a bottomed tube heating vacuum forming machine using a furnace for heating and vacuum forming a bottomed tube in the first embodiment of the present invention.
As shown in FIG. 1, a bottomed tube heating vacuum forming machine 10 projects from a lower box 11, a frame 12 fixedly arranged around the upper part of the lower box 11, and an upper center of the lower box 11. The bottomed tube holding mechanism 13 is provided.

  Also, the bottomed tube heating vacuum forming machine 10 guides the two lifting shafts 14 arranged at the target position with the above-mentioned bottomed tube holding mechanism 13 in the center, and the up and down movement of these lifting shafts 14 respectively. Two cylinder guides 15 are provided. The lifting shaft 14 moves up and down by driving a motor (not shown) arranged in the lower box 11.

  Further, the bottomed tube heating vacuum forming machine 10 has a plate-like member 16 stretched over the upper ends of the two lifting shafts 14, a support leg 17 on the plate-like member 16 and a support leg 17. A casing 19 serving as an outer frame of the furnace placed through the plate-like member 18 is provided. Two sets of wires 21 are drawn from the inside to the outside on the upper surface of the casing 19.

  The casing 19 is disposed above the frame 12 when the bottomed tube is not molded, because the elevating shaft 14 is raised to the standby position as shown in the figure. When the bottomed tube is molded, the elevating shaft 14 is lowered from the standby position shown in the figure to the molding position, so that the casing 19 is lowered to substantially the center of the frame 12.

As a result, the material (bottomed tube material) 22 ′ of the bottomed tube 22 held on the bottomed tube holding mechanism 13 is inserted into a heating furnace body to be described later in the casing 19.
2 is a plan view of the bottomed tube heating vacuum forming machine 10 with the upper heat insulating material of the heating furnace body removed, and the lower part of FIG. 2 shows the upper heat insulating material of the heating furnace main body shown in FIG. It is BB 'sectional drawing of the attached state.

  As shown in FIG. 2, the casing 19 has a peripheral inner wall covered with a heat insulating material 23, an upper inner wall covered with a heat insulating material 24, and a bottom inner wall covered with a heat insulating material 25.

  The tubular heating element 26 into which the material 22 ′ of the bottomed tube 22 is inserted and arranged for heating vacuum forming is arranged in an upright state inside the casing 19, and the upper opening edge is in close contact with the heat insulating material 24 covering the upper inner wall, The lower opening edge is in close contact with the heat insulating material 25 covering the inner wall of the bottom.

  The tubular heating element 26 includes tubular heating elements 26a and 26b that are divided into two in the vertical direction. These tubular heating elements 26 a and 26 b are covered with a heat insulating material 27 over the entire outer peripheral surface thereof. The divided tubular heating elements 26a and 26b correspond to divided tubular heating elements, respectively.

  These tubular heating elements 26a and 26b are covered with a heat insulating material 27 over the entire outer peripheral surface thereof. With the above configuration, the tubular heating element 26 (26a, 26b) and the heat insulating material 27 are formed in the space in the casing 19 formed by the heat insulating material 24 covering the upper inner wall in the casing 19 and the heat insulating material 25 covering the bottom inner wall. It is formed at the same height as the height.

In addition, a gap for forming an air layer 28 is provided between the outer periphery of the heat insulating material 27 and the heat insulating material 23 covering the surrounding inner wall in the casing 19.
Further, inside the tubular heating elements 26a and 26b, temperature measuring elements 29 (29a, 29b) made of, for example, thermocouples for measuring the internal temperature of the tubular heating elements 26a and 26b from the outside of the casing 19 are inserted. Yes. The insertion position is approximately in the middle of each tubular heating element 26 (26a, 26b).

  The temperature measuring bodies 29a and 29b are connected to the temperature controllers 31a and 31b via the wirings 21a-1 and 21b-1, respectively. The temperature measuring elements 29a and 29b transmit temperature control information of the tubular heating elements 26a and 26b to the temperature controllers 31a and 31b, respectively.

  From the temperature controllers 31a and 31b, wirings 21a-2 and 21b-2 for driving the tubular heating elements 26a and 26b to generate heat are connected to the tubular heating elements 26a and 26b, respectively.

The heat insulating material 25 that covers the casing 19 and the bottom inner wall is provided with an insertion port 32 that allows the inside of the furnace formed by the tubular heating element 26 to communicate with the outside.
In the above configuration, as shown in the lower part of FIG. 2, a space is provided between the tubular heating elements 26a and 26b, which are divided tubular heating elements, so that the tubular heating elements 26a and 26b are separated. However, it may be configured to contact both without providing a gap. Moreover, you may comprise so that a clearance gap may be provided and a heat insulating material or an insulating material may be arrange | positioned in the clearance gap part.

In addition, the tubular heating elements 26a and 26b can be easily arranged if they are constituted by a heater in which, for example, a nichrome wire or a kanthal alloy wire is wound in a coil shape.
Next, the process of heating and vacuum forming the material 22 'of the bottomed tube 22 into the bottomed tube 22 using the bottomed tube heating vacuum forming machine 10 having the above-described configuration will be described with reference to FIGS. 1 and 2 again. .

  First, the bottomed tube 22 (or its material 22 ′, the same applies hereinafter) is held by the bottomed tube holding mechanism 13 shown in FIG. 1 with a not-shown cored bar accommodated therein and the bottom portion facing upward. At the same time, the open end of the bottomed tube 22 is in a known configuration connected to a vacuum pump (not shown) so that the inside of the bottomed tube 22 can be evacuated.

  In this configuration state, the two elevating shafts 14 are lowered based on the guidance of the two cylinder guides 15 by the forward rotation of the motor arranged in the lower box 11 shown in FIG. Along with this, the casing 19 descends from the standby position shown in FIG.

  As a result, the bottomed tube 22 held by the bottomed tube holding mechanism 13 is inserted into the furnace formed by the tubular heating elements 26a and 26b via the insertion port 32 as shown in FIG. The

  The bottomed tube 22 inserted into the furnace is heated and softened by convection due to the temperature distribution created by the tubular heating elements 26a and 26b. The heat-softened bottomed tube 22 is pressed against a metal core (not shown) by a pressure difference between the inside and outside due to the negative pressure formed in the bottomed tube 22 by the above-described vacuum pump connected to the bottomed tube 22, A bottomed tube 22 having a desired shape with a cored bar shape transferred to the inner surface is molded.

  Thereafter, the two elevating shafts 14 are raised based on the guidance of the two cylinder guides 15 by rotational driving in the reverse direction of the motor disposed in the lower box 11. As a result, the casing 19 rises to the standby position shown in FIG.

As a result, the bottomed tube 22 that has been vacuum-heated and held by the bottomed tube holding mechanism 13 as described above is removed from the insertion port 32 to the outside of the furnace as shown in FIG.
Thus, according to the first embodiment described above, each divided tubular heating element corresponding to the number of divisions in the vertical direction of the tubular heating element 26 in the furnace for heating and vacuum forming the bottomed tube 22. Heating by means of convection inside the tubular heating element 26 by temperature information of the temperature measuring element 29 (29a, 29b) and heat generation control by the temperature controllers 31a and 31b based on the temperature information (for example, the tubular heating elements 26a and 26b). Detailed setting of the temperature conditions is possible, and high-quality heat vacuum molding with an appropriate temperature distribution becomes possible.

  Further, since the tubular heating element 26 is covered with the heat insulating material 27 over the entire outer peripheral surface thereof, the tubular heating element 26 is not easily affected by the temperature outside the furnace. Becomes easy.

  In addition, in the said 1st Embodiment, although the insertion port 32 is provided in the lower surface of the casing 19, the insertion port 32 is provided in the upper surface of the casing 19, and the raw material of the bottomed tube 22 from the insertion port 32 of this upper surface is provided. 22 'may be inserted / removed with its bottom facing downward.

  In the first embodiment, the casing 19 is moved up and down, but the casing 19 may be fixed and the bottomed tube holding mechanism 13 that holds the bottomed tube 22 may be moved up and down.

FIG. 3 is an external front view of a bottomed tube heating vacuum forming machine using a furnace for heating and vacuum forming a bottomed tube in the second embodiment of the present invention.
As shown in FIG. 3, the bottomed tube heating vacuum forming machine 35 protrudes from the lower box 36, a frame 37 fixedly arranged around the upper portion of the lower box 36, and the upper center of the lower box 36. The bottomed tube holding mechanism 38 is provided.

  Further, the bottomed tube heating vacuum forming machine 35 guides the two lifting shafts 39 arranged at the target position with the above-mentioned bottomed tube holding mechanism 38 in the center, and the vertical movement of these lifting shafts 39. Two cylinder guides 41 are provided. The lifting shaft 39 moves up and down by driving a motor (not shown) arranged in the lower box 36.

  Further, the bottomed tube heating vacuum forming machine 35 has a plate-like member 42 laid over the upper ends of the two lifting shafts 39, a support leg 43 on the plate-like member 42, and a support leg 43. A casing 45 serving as an outer frame of the furnace placed via a plate-like member 44 is provided. On the upper surface of the casing 45, five pairs of wires 46 are drawn from the inside to the outside.

  The casing 45 is arranged above the frame 37 when the bottomed tube is not molded, because the elevating shaft 39 is raised to the standby position as shown in the figure. When the bottomed tube is molded, the elevating shaft 39 is lowered from the standby position shown in the figure to the molding position, so that the casing 45 is lowered to substantially the center of the frame 37.

Thereby, the material (bottomed tube material) 22 ′ of the five bottomed tubes 22 held on the bottomed tube holding mechanism 38 is inserted into a heating furnace body to be described later in the casing 45.
4 is a plan view showing the upper heat insulating material of the heating furnace main body of the bottomed tube heating vacuum forming machine 35, and the lower part of FIG. 4 shows the upper heat insulating material of the heating furnace main body shown in FIG. It is CC 'sectional view taken on the line of the attached state.

  As shown in FIG. 4, the casing 45 has a peripheral inner wall covered with a heat insulating material 47, an upper inner wall covered with a heat insulating material 48, and a bottom inner wall covered with a heat insulating material 49.

  Inside the casing 45, five tubular heating elements 50 are inserted at equal intervals, each of which is inserted with a material 22 'and heated and vacuum-formed into the bottomed tube 22. Since the configurations of the five tubular heating elements 50 and the other members respectively attached to the five tubular heating elements 50 are the same, hereinafter, the other members belonging to the tubular heating element 50 shown at the right end of the figure will be described. A description will be given by assigning numbers only to the configuration.

The tubular heating element 50 is arranged in an upright state inside the casing 45, and the upper opening edge is in close contact with the heat insulating material 48 covering the upper inner wall, and the lower opening edge is in close contact with the heat insulating material 49 covering the bottom inner wall.
The tubular heating element 50 includes tubular heating elements 50a and 50b that are divided into two in the vertical direction.

  And these tubular heat generating bodies 50a and 50b are covered with the heat insulating material 51 in the whole outer peripheral surface. Also in this example, the divided tubular heating elements 50a and 50b correspond to the divided tubular heating elements, respectively.

  These tubular heating elements 50a and 50b are covered with a heat insulating material 51 over their entire outer peripheral surfaces. With the above configuration, the tubular heating element 50 (50a, 50b) and the heat insulating material 51 are formed in the space in the casing 45 formed by the heat insulating material 48 covering the upper inner wall in the casing 45 and the heat insulating material 49 covering the bottom inner wall. It is formed at the same height as the height.

  In addition, a gap for forming an air layer 52 is provided between the outer periphery of the heat insulating material 51 and the heat insulating material 47 covering the surrounding inner wall in the casing 45 and between the adjacent heat insulating materials 51 and 51. Yes.

  Further, inside the tubular heating elements 50a and 50b, temperature measuring elements 53 (53a, 53b) made of, for example, thermocouples, which measure the internal temperature of the tubular heating elements 50a and 50b from the outside of the casing 45, are inserted. Yes. The insertion position is approximately in the middle of each tubular heating element 50 (50a, 50b).

  The temperature measuring bodies 53a and 53b are connected to the temperature controllers 54a and 54b via wirings 46a-1 and 46b-1, respectively. The temperature measuring bodies 53a and 53b transmit temperature control information of the tubular heating elements 50a and 50b to the temperature controllers 54a and 54b, respectively.

  From the temperature controllers 54a and 54b, wirings 46a-2 and 46b-2 for driving the heat generation of the tubular heating elements 50a and 50b are connected to the tubular heating elements 50a and 50b, respectively.

Further, the heat insulating material 49 that covers the casing 45 and the inner wall of the bottom portion is provided with an insertion port 55 that allows the inside of the furnace formed by the tubular heating element 50 to communicate with the outside.
In this example as well, in the above configuration, as shown in the lower part of FIG. 4, the tubular heating elements 50a and 50b are separated by providing a gap between the tubular heating elements 50a and 50b, which are divided tubular heating elements. Although illustrated, it may be configured to contact both without providing a gap. Or you may comprise so that a clearance gap may be provided and a heat insulating material or an insulating material may be arrange | positioned in the clearance gap part.

  In addition, the step of heat-vacuum forming the material 22 ′ of the bottomed tube 22 into the bottomed tube 22 using the bottomed tube heating vacuum forming machine 35 having the above-described configuration includes the number of furnaces formed by the tubular heating element 50. This is basically the same as the case of the bottomed tube heating vacuum forming machine 10 shown in FIG. 1 and FIG.

  However, in the second embodiment, in addition to the same effects as those of the first embodiment for the individual tubular heating elements 50, the bottomed tube heating vacuum forming machine 35 of the second embodiment is further provided. Since a plurality of tubular heating elements 50 are arranged in the heating furnace body, a plurality of bottomed tubes having good quality by uniform heating as in the case of the first embodiment are formed at a time. can do.

  Not only that, the molding parts in the furnace are functionally independent of each other and the temperature is controlled independently of each other. It becomes possible, and a plurality of types of bottomed tubes 22 can be heated and vacuum formed by one-time heating vacuum forming by the bottomed tube heating vacuum forming machine 35.

  Further, when the raw materials 22 ′ of the plurality of bottomed tubes 22 are arranged in the plurality of tubular heating elements 50, air layers 52 are respectively provided between the heat insulating materials 51 and 51 covering the tubular heating elements 50. Therefore, convection occurs in the air layer 52, and the heat effect from the adjacent molded portion on the side surface of the heat insulating material 51 is uniformly received in the circumferential direction without receiving only a part of the heat insulating material 51 in the circumferential direction. Therefore, it does not adversely affect the molding quality.

  In the second embodiment, the insertion port 55 is provided on the lower surface of the casing 45. However, the insertion port 55 is provided on the upper surface of the casing 45, and five bottoms are provided from the insertion port 55 on the upper surface. The material 22 ′ of the tube 22 may be inserted / removed with its bottom facing downward.

  In the second embodiment, the casing 45 is moved up and down. However, the casing 45 may be fixed and the bottomed tube holding mechanism 38 that holds the bottomed tube 22 may be moved up and down.

  Moreover, in the said 2nd Embodiment, although the number of shaping | molding of the heating furnace main body is five, it may not be five. That is, an arbitrary number may be set.

  FIG. 5 is a side sectional view of a furnace for heating and vacuum forming a bottomed tube in the third embodiment of the present invention. In FIG. 5, components having the same functions as in FIG. 2 are given the same numbers as in FIG.

  The furnace 56 for heating and vacuum forming the bottomed tube in the present example has basically the same configuration as the furnace in the first embodiment shown in FIG. However, the division | segmentation tubular heating element which forms the tubular heating element 57 differs from the case of 1st Embodiment in the point which is a 4 division structure which consists of the tubular heating elements 57a-57d.

  In this example, as shown in FIG. 5, temperature measuring bodies 58a to 58d, wires (signal lines) 59a to 59d, and temperature controllers 61a to 61d correspond to each of the tubular heating elements 57a to 57d divided into four parts. 61d and wirings (distribution lines) 62a to 62d are disposed.

  The operation of heating vacuum forming in this example is basically the same as that in the case of the furnace in the first embodiment. However, in this example, since the tubular heating element 57 has a four-part configuration composed of the tubular heating elements 57a to 57d, a more detailed temperature distribution can be created in the furnace, and thereby a more precise furnace interior. Therefore, it becomes possible to produce a bottomed tube with higher quality.

It is an external appearance front view of the bottomed tube heating vacuum forming machine using the furnace for carrying out heating vacuum forming of the bottomed tube in 1st Embodiment. The top is a plan view showing the upper heat insulating material of the heating furnace main body of the bottomed tube heating vacuum forming machine in the first embodiment, and the lower is the BB with the upper heat insulating material of the heating furnace main body shown above attached. FIG. It is an external appearance front view of the bottomed tube heating vacuum forming machine using the furnace for carrying out heating vacuum forming of the bottomed tube in 2nd Embodiment. The top is a plan view showing the upper heat insulating material of the heating furnace main body of the bottomed tube heating vacuum forming machine in the second embodiment, and the lower is the CC with the upper heat insulating material of the heating furnace main body shown above attached. FIG. It is a sectional side view of the furnace for carrying out the heating vacuum forming of the bottomed tube in 3rd Embodiment. It is a sectional side view of the heating vacuum forming furnace for carrying out the heating vacuum forming of the conventional bottomed tube. It is AA 'arrow sectional drawing (plane sectional drawing) of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Heat insulation wall 3 Lower heat insulation lid 4 Upper heat insulation lid 5 Quartz tube 6 Insertion port 7 Bar heater 8 Bottomed tube material 10 Bottomed tube heating vacuum forming machine 11 Lower box 12 Frame 13 Bottomed tube holding mechanism 14 Lifting Shaft 15 Cylinder guide 16 Plate-shaped member 17 Support leg 18 Plate-shaped member 19 Casing 21 (21a-1, 21a-2, 21b-1, 21b-2) Wiring 22 Bottomed tube 22 'Material 23, 24, 25 Thermal insulation 26 Tubular heating element 26a, 26b Tubular heating element (split tubular heating element)
27 Heat insulating material 28 Air layer 29 (29a, 29b) Temperature measuring element 31a, 31b Temperature controller 32 Insertion port 35 Bottomed tube heating vacuum forming machine 36 Lower box 37 Frame 38 Bottomed tube holding mechanism 39 Lifting shaft 41 Cylinder guide 42 plate-like member 43 support leg 44 plate-like member 45 casing 46 (46a-1, 46a-2, 46b-1, 46b-2) wiring 47, 48, 49 heat insulating material 50 tubular heating element 50a, 50b tubular heating element ( Split tubular heating element)
DESCRIPTION OF SYMBOLS 51 Heat insulating material 52 Air layer 53 (53a, 53b) Temperature measuring body 54a, 54b Temperature controller 55 Insertion port 56 Furnace for heating and vacuum-forming a bottomed tube 57 Tubular heating element 57a-57d Tubular heating element (divided tubular heating element) body)
58a-58d Temperature measuring element 59a-59d Signal line 61a-61d Temperature controller 62a-62d Distribution line

Claims (5)

  In a furnace having a tubular heating element arranged so that one end thereof communicates with the outside in the furnace, and performing vacuum heating by inserting a bottomed tube material into the tubular heating element from the outside, the tubular A divided tubular heating element that forms at least two parts in the vertical direction forming the heating element, a temperature measuring element that measures the temperature of each of the divided tubular heating elements, and a temperature control that adjusts the temperature of each of the divided tubular heating elements A furnace for heating and vacuum forming a bottomed tube, characterized by controlling a vertical temperature distribution in the tubular heating element.   The furnace for heat-vacuum forming a bottomed tube according to claim 1, wherein the outer peripheral surface of the tubular heating element is covered with a heat insulating material. In a furnace having a plurality of tubular heating elements arranged so that one end communicates with the outside in the furnace, and performing vacuum heating by inserting a bottomed tube material into the tubular heating element from the outside ,
A heat insulating material covering the outer peripheral surface of the tubular heating element;
A plurality of divided tubular heating elements that are divided into at least two in the vertical direction to form the tubular heating element;
A temperature measuring element for measuring the temperature of each of the divided tubular heating elements,
A temperature controller for adjusting the temperature of each of the divided tubular heating elements;
And a furnace for heating and vacuum forming a bottomed tube, wherein the temperature distribution in the vertical direction in the tubular heating element is controlled.   The bottomed tube according to claim 3, wherein the plurality of tubular heating elements are internally provided with a side communicating with the outside thereof in a unidirectional plane and an air layer provided between the heat insulating materials. Furnace for heating vacuum forming. The furnace for heating and vacuum forming a bottomed tube according to claim 3, wherein the temperature measuring element and the temperature controller individually control the temperature of the plurality of tubular heating elements.

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