JPH081828B2 - Material welding prevention device in induction heating machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to abutting of a material to be heated (hereinafter referred to as “material”) being conveyed in an induction coil of an induction heating machine for hot forging or the like. The present invention relates to an improvement of a material welding prevention device in an induction heating machine that prevents the ends from being welded to each other.

(Prior Art) In the conventional induction heating machine, as shown in FIGS. 5 and 6, the induction mechanism 1 is continuously fed into the induction coil 1 by the feeding mechanism 5 including the drive motor 11, the chain 14 and the pinch roller 12. The material 3 to be heated is heated while being slid and conveyed on the rails 4 and 4 with the same lower surface always in contact with the rails 4 and 4, so that the heating temperature is set to 1250 ° C, for example. In this case, mainly the upper end surface of the material 3 becomes higher than the set temperature, welding often occurs at the upper end portion, and 2 to 4 materials 3 are unloaded from the exit of the material 3 of the induction coil 1 while being connected. However, when the material 3 comes out in a connected state, it is necessary for the operator to immediately give an impact to the material 3 to separate it and to perform the molding process of the separated portion.

Then, when one or two raw materials 3 are connected and come out, the subsequent raw material 3 can be formed, but when more raw materials 3 come out, the raw material 3 has a lower heating temperature. Since the plastic deformation resistance increases, the forming process of these materials becomes impossible, and the raw material 3 whose temperature has decreased must be naturally cooled to room temperature and heated again by the induction heater.

Regarding welding of materials, with conventional smooth rails,
70% of the material was melted and welded, and an operator gave a shock to separate it, and then the separated part was processed. Occasionally, three or more materials are connected and occupy about 50% of them.

Since the heating of the material is limited to three times, the waste of the material due to reheating accounts for 0.1% of the total number of heating. The extra heating power due to reheating accounts for 16% of the heating power. In addition, since the material 3 can be heated only three times due to decarburization of the surface, rough skin due to scale, etc., the material 3 is discarded by reheating, and extra heating power is consumed for reheating. , Productivity is declining.

By the way, as a solution to the above problem, for example,
As disclosed in Japanese Utility Model Application Laid-Open No. 51-34514, there is a "pillet welding prevention mechanism in an induction heating coil including a skit rail provided in the induction heating coil and a vibrator for giving vibration to the skit rail". is there.

(Problems to be Solved by the Invention) However, the pyret welding prevention mechanism in the induction heating coil described in Japanese Utility Model Publication No. 51-34514 discloses a mechanism for applying vibration to a skit rail provided in the induction heating coil. It is equipped with a vibrator, requires a device and energy to operate the vibrator,
The structure is complicated.

INDUSTRIAL APPLICABILITY The present invention can be easily installed in an existing induction heating machine without complicated processing, has a simple structure, is inexpensive, has no failure, is excellent in durability, and is an apparatus for vibrating a material. An object of the present invention is to provide a material welding prevention device for an induction heating device, which can surely weld the materials to each other without requiring a shaking device.

(Means for Solving the Problems) The material welding prevention device in the induction heating machine according to the present invention conveys the material laid inside the induction coil 2
On the rail of the book, a plurality of raised portions each having an inclined surface for raising the material being continuously pressed and conveyed and a vertical or almost vertical cut-off surface for suddenly dropping after the material is raised are provided.

Further, the material welding prevention device in the induction heating machine according to the present invention vertically drops the material continuously pressed and conveyed on the two rails for conveying the material laid in the induction coil. Alternatively, a plurality of paragraphs each having a substantially vertical cut-off surface and an inclined surface for raising the material dropped by the following material are provided.

(Operation) The material continuously pressed and conveyed by the feeding mechanism and fed into the induction coil has a plurality of raised portions provided on the left and right two laid rails according to the diameter and length of the material. It is said that the rising and falling are repeated several times due to the inclined surface of the ridge provided on the rail only by the action of the pushing force from the rear and the vertical or steeply cut-off cutting surface that causes a sharp drop after ascending. By the action
It is possible to reliably prevent the mutual welding of materials.

In addition, the material that is continuously pressed and conveyed by the feeding mechanism and fed into the induction coil is provided on the two left and right rails laid by the plurality of paragraphs provided according to the diameter and length of the material. , It is said that the rising and falling are repeated several times due to the cut-off surface of the paragraph provided on the rail and the sharp cut-off surface and the inclined surface cut off at a steep angle only by the action of the force pushed from the rear. By the action, it is possible to surely prevent the mutual welding of the materials.

In addition, the material being transported rises and falls due to the sloping surfaces of the ridges provided on the left and right rails at asymmetrical positions and the cut-off surface cut vertically or at a steep angle that causes the ascended material to fall suddenly. Do a twisting exercise while repeating. Further, in the case where the paragraphs provided on the rails are provided at asymmetrical positions, the cut-off surface and the inclined surface make a twisting motion while repeating falling and rising several times.

Each material being conveyed in succession has a ridge or a ridge on two rails that raises the material being conveyed and a vertical or steep angle cut-off that causes the material to drop suddenly after rising. The contact surfaces of adjacent materials are momentarily separated and sent out of the induction coil by repeating the action of rising along the surface and then falling, or repeating the operation of rising after falling several times.

(Embodiment) An embodiment of a material welding prevention device in an induction heater according to the present invention will be described with reference to FIGS. 1 to 4 of the drawings. The material is pressed in the direction of the arrow shown in FIG. A ridge 9 having an inclined surface 6 that gradually rises according to the traveling direction and a cut-off surface 7 that is cut vertically or at a steep angle on the upper surface of rails 4 and 4 laid inside the induction coil 1 that conveys the material 3 that is being conveyed. Is provided.

The inclined surface 6 and the cut-off surface 7 of the raised portion 9 are continuously fed into the induction coil 1 by the feeding mechanism 5 including the drive motor 11, the chain 14 and the pinch roller 12 and heated on the rails 4 and 4. The material 3 is lifted and then suddenly dropped. The materials 3 and 3 that are continuously pressed and transported are lifted up the inclined surface 6 of the raised portion 9 and then cut off vertically or at a steep angle. Since it falls from the cut-off surface 7, the contact surface between the materials 3, 3 separates. In addition,
The contact surfaces between the material 3 and the rails 4 and 4 can be slightly changed by setting the shapes of the inclined surface 6 and the cut-off surface 7.

In addition, it is possible to give a rotational movement to the material 3 by shifting the left and right installation positions of the raised portion 9 or changing the size and shape, and also to increase the contact surface between the material 3 and the rails 4 and 4. It can also be moved.

The raised portion 9 may be formed integrally with the rails 4 and 4, or the plurality of raised portions 9 may be formed as a fitting body to the rails 4 and 4 arranged at appropriate intervals. It may be fitted and fixed to the parts 4 and 4.

An inner wall 2 made of a heat-resistant insulating material is provided on the inner surface of the induction coil 1 for heating the material 3, and the material 3 is a drive motor.
11, continuously fed by the feed mechanism 5 including the chain 14 and the pinch roller 12, onto the rails 4 and 4 laid in the induction coil 1 in a pressed state, and sliding along the rails 4 and 4. It moves, is heated to a predetermined temperature in the induction coil 1, and is discharged from the outlet of the induction coil 1 along the guide portions 13 of the rails 4, 4.

The rails 4 and 4 are composed of two rod-shaped bodies having heat-resistant and abrasion-resistant smooth surfaces or pipes such as steel pipes, a plurality of mounting plates 8 connecting them and a guide portion 13 at the outlet of the material 3. There is. The rails 4 and 4 may be formed by bending a plate, and the inner wall 2 of the induction coil 1 may be formed.
It may be in the form of two rails.

In the case of the steel pipe rails 4 and 4, cooling water is passed through the steel pipe in order to prevent the heating temperature of the material 3 by the induction coil 1 from rising. In the case where the raised portion 9 is provided on the steel pipe, the raised portions 9 and 9 are symmetrically formed on the upper surface of the water-cooled steel pipe forming the two rails 4 and 4 as shown in FIG. Multiple arrangements are fixed.

Further, in the structure shown in FIG. 3, a plurality of raised portions 9, 9 are laterally asymmetrically arranged and fixed on the upper surfaces of the two rails 4, 4.

Further, the raised portions 9, 9 may be formed of heat-resistant ceramics, and may be individually attached and fixed on the rails 4, 4.

In a further embodiment shown in FIG. 4, on the rails 4, 4, there is provided a paragraph 10 consisting of a cut-off surface 7 and a sloped surface 6 following which the material 3 is raised.

Protuberances 9, 9 or paragraphs 10, 10 may be provided between the rails 4, 4 or near the exit of the induction coil 1 of the material 3.

Further, in the induction coil 1 of the induction heating machine, the rails 4 and 4 are formed in a vertical V shape so that the material 3 is repeatedly moved up and down to prevent the materials 3 and 3 from being welded to each other. it can.

Further, in the case shown in FIG. 2, the respective materials 3 and 3 that are continuously pressed and conveyed rise up the inclined surface 6 of the raised portion 9 and then fall from the cut-off surface 7 cut vertically or at a steep angle. Therefore, the contact surfaces between the materials 3 and 3 are separated,
At this time, the raised portions 9 and 9 are provided on the two left and right rails 4 and 4 at asymmetrical positions except for the vicinity of the guide portion 13 at the exit of the induction coil 1, so that the material 3 being conveyed is raised. ,
Due to the inclined surfaces 6 and 6 and the cut-off surfaces 7 and 7 of 9, a twisting motion is carried out while the ascending and descending are repeated several times.

Further, in the one shown in FIG. 3, after the materials 3, 3 which are continuously pressed and conveyed fall from the cut-off surface 7 cut vertically or at a steep angle, the inclined surface 6 is pressed by the succeeding material 3. , The contact surfaces between the respective materials 3 and 3 are separated from each other. Since it is installed in the position, rails 4, 4
Due to the cut-off surfaces 7 and 7 and the inclined surfaces 6 and 6 of the paragraphs 10 and 10 provided above, a twisting motion is performed while repeatedly falling and rising several times.

In addition, in the water-cooled steel pipe rails 4 and 4, the temperature distribution on the end surface of the material 3 is particularly large, and when forming into a complicated shape, the upper end of the material 3 has an allowable heating temperature. Although it was necessary to discard the material 3 beyond the range in some cases, according to the present invention, the rejection rate due to excessive heating when heating at a high temperature of 1250 ° C. or higher is 3
% Was 0%, and due to the welding of materials,
As for work loss, productivity was improved by 10% and heating power could be reduced by 8%.

(Effects of the Invention) The material adhesion prevention device for an induction heating machine according to the present invention can be easily installed in an existing induction heating machine without complicated processing, its structure is simple, and the cost can be reduced. There is no failure, it has excellent durability, and there is an effect that the mutual welding of the materials can be reliably prevented without the need for an oscillating device for vibrating the materials.

Further, the material welding prevention device for an induction heating device according to the present invention can solve the conventional problem of productivity decrease due to reheating, and can significantly reduce the mutual welding rate of materials, Also, it has an effect that the productivity of heating the material in the induction heater based on the uneven heating temperature and the quality of the material after heating can be improved.

[Brief description of drawings]

1 to 4 of the drawings show an embodiment of an apparatus for preventing welding of a material for an induction heater according to the present invention, and FIG. 1 is a side cross-sectional view of an apparatus for preventing the welding of a material for an induction heater. 2 and 3 are perspective views of the rail shown in FIG. 1, FIG. 3 is a perspective view of another embodiment of the rail, and FIG. 4 is a perspective view of yet another embodiment of the rail. FIG. 5 is a side sectional view of the entire conventional induction heating machine, and FIG. 6 is a sectional view taken along the line AA of FIG. 1 ... Induction coil, 2 ... Inner wall 3 ... Material, 4 ... Rail, 5 ... Feed mechanism, 6 ... Inclined surface, 7 ... Cutoff surface, 8 ... Mounting plate, 9 ... Raised part, 10 ... Paragraph part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isao Kawakami 390, Meiji Seisakusho Co., Ltd., 390 Dakyoji-cho, Kurayoshi-shi, Tottori Prefecture (56) Bibliography Sho 51-34514 (JP, U)

Claims (2)

[Claims] 1. An inclined surface for raising a material continuously pressed and conveyed on two rails for conveying a material laid in an induction coil, and a vertical or nearly vertical cut-off for suddenly dropping after rising. A material welding prevention device in an induction heater, comprising a plurality of raised portions each having a surface. 2. A vertical or nearly vertical cut surface for suddenly dropping a material which is continuously pressed and conveyed on two rails for conveying a material laid in an induction coil and a subsequent material to drop the material. A plurality of paragraphs each having an inclined surface for raising the above-mentioned material are provided, respectively, and a material welding prevention device in an induction heater.