JP5185524B2 - Drum type induction hardening equipment - Google Patents

Description

  The present invention relates to a drum type induction hardening apparatus for induction hardening a relatively small workpiece (work).

A turntable type induction hardening device is known as a device for continuously induction hardening a workpiece such as a spur gear (for example, see Patent Document 1). In this turntable type induction hardening apparatus, a work is placed on a circular (disk-shaped) turntable extending in parallel to a horizontal plane, and the work is induction-heated and rapidly cooled while the turntable is rotated.
Japanese Patent Laid-Open No. 6-0117117

  When a large amount of workpieces are to be quenched at once using the above-described induction hardening apparatus, the diameter of the turntable is increased to increase the area. However, since the installation area (occupied area) of the turntable is increased by increasing the area of the turntable, the installation area of the turntable type induction hardening apparatus is increased.

  In addition, since the apparatus is deployed in a planar shape, the work insertion part and the heating coil may be close to each other depending on the size of the turntable, and the protection mechanism is complicated to ensure the safety of the operator. Furthermore, since the work heated to high frequency heating returns to the unloading section, it is necessary to sufficiently consider the safety of burns and the like in the case of manual work.

  In view of the above circumstances, an object of the present invention is to provide a drum-type induction hardening apparatus that requires only a small installation area even if it is configured to quench a large amount of objects to be processed at one time.

In order to achieve the above object, the drum type induction hardening apparatus of the present invention comprises:
(1) A disk-shaped rotating body having an insertion hole into which an object to be processed is inserted, which rotates about a rotation axis extending in the horizontal direction, and is formed on the outer peripheral wall;
(2) An induction heating coil disposed to be separated from the rotating body on the outside of the outer peripheral wall for induction heating the workpiece inserted into the insertion hole;
(3) The induction heating coil that cools the workpiece by injecting a cooling liquid through a cooling gap formed in the induction heating coil to the workpiece heated by the induction heating coil. A cooler separate from the induction heating coil, disposed on the opposite side to the outer peripheral wall,
(4) A workpiece collection member disposed below the rotating body that receives and collects the workpiece that has freely dropped from the insertion hole is provided.

here,
(5) When a line segment connecting one position among positions where a horizontal line perpendicular to the rotation axis intersects the outer peripheral wall of the rotating body and the rotation axis is used as a reference line,
(6) The insertion position into which the workpiece is inserted into the insertion hole is above the reference line, and an angle formed between a line segment connecting the insertion position to the rotation axis and the reference line is It is a position that falls within the range of 30 ° or more and 90 ° or less,
(7) The coil position where the induction heating coil is disposed is on the side opposite to the insertion position across a vertical line passing through the rotation axis, and is a line segment connecting the coil position to the rotation axis. And an angle formed by the reference line may be within a range of 100 ° to 180 °.

Also,
(8) The workpiece collection member may move in a direction in which a horizontal line orthogonal to the rotation axis extends.

further,
(9) You may provide the positioning means which determines the position which the said rotary body stops.

  According to the present invention, since the disk-shaped rotating body is configured to rotate about the rotation axis extending in the horizontal direction, the disk-shaped rotating body rotates in a standing state, and the rotating body The installation area, that is, the installation area (occupied area) of the entire apparatus may be smaller than that of the turntable. In addition, in order to quench a large amount of workpieces at once, when the area of the outer peripheral wall of the rotating body is widened to form many insertion holes, the diameter of the rotating body increases or the width of the outer peripheral wall Because it is only wide, the installation area is only a little wider. Furthermore, the insertion position for inserting the workpiece into the insertion hole and the coil position where the induction heating coil is arranged can be arranged on opposite sides of the vertical line passing through the rotating shaft of the rotating body. Since the position is far from the coil position, safety can be ensured.

  The present invention has been realized in a drum type induction hardening apparatus for induction hardening a part of a relatively small and rod-shaped workpiece.

  An example of the drum type induction hardening apparatus of the present invention will be described with reference to FIGS.

  FIG. 1 is a front view showing a schematic configuration of an example of a drum type induction hardening apparatus. FIG. 2A is a plan view of the drum type induction hardening apparatus of FIG. 1, and FIG. 2B is a side view showing a work to be induction hardened. Note that FIG. 1 does not show a drive system for rotating the rotating drum, and FIG. 2A shows only a part of the drive system. Moreover, in FIG. 2, the workpiece | work W is represented larger than the insertion hole 22a.

  The drum-type induction hardening apparatus 10 is made of a stainless steel disc-shaped rotating drum 20 (which is an example of a rotating body referred to in the present invention) and an induction heating coil 30 that induction-heats a part of the workpiece (workpiece W). A cooler (cooling jacket) 40 that cools the workpiece W heated by the induction heating coil 30, a workpiece collection member 50 that receives and collects the workpiece W that has freely dropped from the rotating drum 20, and a rotating drum. And a drive system 60 that rotates 20 in the direction of arrow A.

  The rotating drum 20 rotates in the direction of arrow A (clockwise in FIG. 1) about a rotating shaft 24 extending in the horizontal direction. The rotary drum 20 includes an annular outer peripheral wall 22 in which an insertion hole 22a into which the workpiece W is inserted is formed. Two insertion holes 22a are formed side by side in the width direction of the outer peripheral wall 22 (the direction perpendicular to the paper surface of FIG. 1 and the longitudinal direction of the paper surface of FIG. 2). Eight insertion holes 22a are formed at intervals. That is, a total of 16 insertion holes 22 a are formed in the outer peripheral wall 22. The workpiece W inserted into the insertion hole 22a is temporarily fixed to the insertion hole 22a by the frictional force between the inner peripheral surface of the insertion hole 22a and the outer peripheral surface of the workpiece W. The outer peripheral wall 22 is fixed to the rotating shaft 24 by a plurality of support plates 26 (only one is shown in FIG. 1) extending radially from the rotating shaft 24. The number and formation positions of the insertion holes 22a are appropriately determined depending on the implementation state of induction hardening, the size of the workpiece W, and the like. Further, as shown in FIG. 2A, both ends in the longitudinal direction of the rotating shaft 24 are rotatably held by bearings 28 and 29, respectively.

  Since the disk-shaped rotating drum 20 rotates in a standing state as described above, the installation area of the rotating drum 20 can be reduced, and the installation area of the drum-type induction hardening apparatus 10 can be reduced.

  The insertion position (insertion position) where the workpiece W is inserted into the insertion hole 22a will be described.

  Here, as shown in FIG. 1, a position 22b and a center 24a out of positions where a horizontal line that passes through the center 24a of the rotating shaft 24 and intersects the outer peripheral wall 22 of the rotating drum 20 intersects the rotating shaft 20 The connecting line segment L is defined as a reference line L. The above insertion position is above the reference line L, and the angle between the reference line L and the line connecting the insertion position to the rotary shaft 24 is within a range of 30 ° to 90 °. is there. That is, as shown in FIG. 1, when θ1 (center angle when the outer peripheral wall is regarded as a circle) is 30 ° and θ2 is 90 °, the insertion position is provided within the range of θ3, that is, 60 °. By providing the insertion position at such a position, the workpiece W can be easily inserted into the insertion hole 22a, so that productivity can be improved. Note that the insertion of the workpiece W may be mechanized and automated using a robot or the like. As the insertion position, for example, a position of 45 ° upward from the reference line L can be mentioned.

  When inserting the workpiece W into the insertion hole 22a, the rear end W2 shown in FIG. 2B is inserted into the insertion hole 22a so that the front end W1 protrudes from the outer peripheral wall 22. Thus, when the workpiece | work W is inserted in the insertion hole 22a, only the front-end | tip part W1 is induction-heated and quenched. In addition, although the workpiece | work W which did not fall freely for some reason moves to an insertion position, it is easily collect | recovered by the operator etc. in an insertion position.

  As shown in FIG. 1, the induction heating coil 30 is disposed outside the outer peripheral wall 22 and on the side opposite to the insertion position with a vertical line (not shown) passing through the rotation shaft 24 interposed therebetween. . The position of the induction heating coil 30 (coil position) is a position where the angle formed by the line segment connecting the coil position to the center 24a of the rotating shaft 24 and the reference line L is within a range of 100 ° to 180 °. That is, as shown in FIG. 1, when θ4 is 100 ° and θ5 is 180 °, the coil is set within the range of θ6, that is, 80 °. Examples of the coil position include a position where θ4 is 135 °.

  A protection member 32 is disposed above the induction heating coil 30 so as to cover the induction heating coil 30. The protective member 32 prevents the worker from coming into contact with the induction heating coil 30 or the heated workpiece W.

  The cooler 40 is disposed on the side opposite to the rotary drum 20 with the induction heating coil 30 interposed therebetween. The workpiece W heated by the induction heating coil 30 is rapidly cooled by the coolant sprayed from the cooler 40.

  As illustrated in FIG. 1, the workpiece collection member 50 is a plate-like member disposed below the rotary drum 20. The workpiece W inserted into the insertion hole 22a starts to fall freely due to gravity from a position where θ5 exceeds 180 °. The position where the workpiece W is freely dropped varies depending on the state in which the workpiece W is in contact with the outer peripheral wall 22 by frictional force or the like, the weight and size of the workpiece W, and the like. Therefore, the workpiece collection member 50 is configured to include a guide rail (not shown) or the like so that the workpiece collection member 50 can move in a direction (arrow B direction) in which a horizontal line perpendicular to the rotation shaft 24 extends. In addition, the workpiece | work W which dropped freely from the insertion hole 22a and was collect | recovered by the to-be-processed object collection | recovery member 50 is put in a box (not shown) etc.

  With reference to FIG. 3 and FIG. 4, the drive system of the drum type induction hardening apparatus of FIG. 1 is demonstrated.

  FIG. 3 is a front view showing the drive system. 4 is a plan view of the drive system of FIG. In these drawings, the same components as those shown in FIGS.

  The drive system 60 includes a motor 62 with a brake, a chain 64, sprockets 66 and 68, and the like. A sprocket 68 is fitted and fixed to a portion of the rotary shaft 24 that is rotatably supported by the bearing 29. On the other hand, a motor 62 with a brake for rotating the rotary drum 20 is disposed at a position away from the rotary drum 20. A sprocket 66 is fitted and fixed to the rotating shaft of the motor 62 with brake. A chain 64 is spanned between the two sprockets 66 and 68, and the rotating shaft 24 and the rotating drum 20 are configured to rotate in the direction of arrow A when the motor 62 with brake is driven. As the motor 62 with brake, a servo motor or a stepping motor is used.

  Each time the rotating drum 20 rotates by 45 ° at the central angle, the rotating drum 20 temporarily stops for the insertion or quenching of the workpiece W. The drum-type induction hardening apparatus 10 is provided with positioning pins 70 in order to stably fix the rotary drum 20 when it is temporarily stopped. The positioning pin 70 is configured to move parallel to the rotary shaft 24 by a solenoid (not shown) or a drive motor (not shown). Further, eight positioning holes 20 a into which the positioning pins 70 are inserted at a predetermined timing are formed in a portion of the side wall of the rotary drum 20 close to the outer peripheral wall 22. As shown in FIG. 3, these eight positioning holes 20a are formed at equal intervals 45 degrees apart from each other at the central angle, and are formed near the insertion hole 22a. While the rotary drum 20 is rotating, the positioning pin 70 is moved to the position indicated by the solid line in FIG. 4 and does not hinder the rotation. When the rotating drum 20 is temporarily stopped, the positioning pin 70 is moved to the position indicated by the two-dot chain line in FIG. 4 and the rotating drum 20 is stably fixed. The positioning pin 70 and the positioning hole 20a constitute the positioning means referred to in the present invention.

  The induction heating coil 30 and the cooler 40 will be described with reference to FIG.

  FIG. 5 is a schematic configuration diagram showing the induction heating coil viewed from the cooler side.

  The induction heating coil 30 has a T-shape as a whole and is attached to a bakelite plate 34 (see FIG. 1). The bakelite plate 34 is fixed to a column of the protection member 32 (see FIG. 1) via an attachment arm 36 (see FIG. 1). The induction heating coil 30 includes a rectangular conductor portion 30 a that is longer than the width L of the rotary drum 20. A cooling gap 30b through which the coolant sprayed from the cooler 40 passes is formed at the center of the conductor portion 30a. The width L1 of the cooling gap 30b is about 5 mm. The conductor portion 30a is connected to a high frequency power source (not shown) by two electrically insulated connection portions 30c and 30d.

  The cooler 40 is disposed on the side opposite to the rotary drum 20 with the conductor portion 30a interposed therebetween (see FIG. 1 and the like). The coolant sprayed from the cooler 40 passes through the cooling gap 30b and travels toward the rotary drum 20.

  When the work W inserted into the insertion hole 22a of the rotating drum 20 reaches a position facing the cooling gap 30b, the rotating drum 20 is temporarily stopped, and electric power is supplied to the induction heating coil 30 from a high frequency power source (not shown). For example, it is supplied for about 5 seconds. Thereby, the front-end | tip part W1 of the workpiece | work W is heated to quenching temperature. Immediately after the tip W1 is heated, the cooling liquid is jetted from the cooler 40. The jetted coolant passes through the cooling gap 30b and rapidly cools the tip W1 of the workpiece W. The time for injecting the coolant from the cooler 40 is, for example, 1.5 seconds. After the cooling of the workpiece W is completed, the rotary drum 20 is rotated by 45 °, the next workpiece W (unquenched workpiece W) reaches a position facing the cooling gap 30b, and the same processing as described above is performed. The

  FIG. 6 shows experimental data obtained by actually quenching using the drum type induction hardening apparatus 10 described above.

  FIG. 6 is a graph showing the hardness distribution of the workpiece W shown in FIG.

  From this data, the hardened layer depth shown in FIG. 2B was 600 HV from the surface of the workpiece W to 4 mm, and good results were obtained.

  Moreover, since the workpiece | work W inserted in the insertion hole 22a of the rotating drum 20 is quenched sequentially, a lot of workpiece | work W can be quenched at once. Further, since the rotating drum 20 rotates in a standing state, the installation area of the rotating drum 20, that is, the installation area (occupied area) of the entire apparatus may be smaller than that of a conventional turntable.

It is a front view which shows schematic structure of an example of a drum type induction hardening apparatus. (A) is a top view of the drum type induction hardening apparatus of FIG. 1, (b) is a side view which shows the workpiece | work to which induction hardening is carried out. It is a front view which shows a drive system. FIG. 4 is a plan view of the drive system in FIG. 3. It is a schematic block diagram which shows the induction heating coil seen from the cooler side. It is a graph which shows an example of the hardened layer depth of the workpiece | work W.

DESCRIPTION OF SYMBOLS 10 Drum type induction hardening apparatus 20 Rotating drum 20a Positioning hole 22 Outer peripheral wall 22a Insertion hole 24 Rotating shaft 30 Induction heating coil 40 Cooler 50 Workpiece collection member 60 Driving system 70 Positioning pin W Workpiece (the hatched portion is a hardened layer) )

Claims (4)

A disc-shaped rotating body having an insertion hole into which an object to be processed is inserted, which rotates around a rotating shaft extending in a horizontal direction,
An induction heating coil arranged to be spaced apart from the rotating body on the outside of the outer peripheral wall for induction heating the workpiece inserted into the insertion hole;
Cooling the processing object by injecting a cooling liquid through a cooling gap formed in the induction heating coil to the object heated by the induction heating coil, the outer periphery across the induction heating coil A cooler disposed on the side opposite to the wall, separate from the induction heating coil ;
A workpiece collection member disposed below the rotating body that receives and collects the workpiece that has fallen freely from the insertion hole, and
A drum-type induction hardening apparatus comprising: When a horizontal line perpendicular to the rotation axis crosses the outer peripheral wall of the rotating body and a line segment that connects the position of the rotation axis and the rotation axis as a reference line,
The insertion position at which the workpiece is inserted into the insertion hole is above the reference line, and an angle formed by a line segment connecting the insertion position to the rotation axis and the reference line is 30 ° or more. It is a position that falls within the range of 90 degrees or less,
The coil position where the induction heating coil is arranged is on the side opposite to the insertion position across a vertical line passing through the rotation axis, and a line segment connecting the coil position to the rotation axis and the reference The drum-type induction hardening apparatus according to claim 1, wherein the angle formed with the line is in a range of 100 ° to 180 °.   The drum-type induction hardening apparatus according to claim 1 or 2, wherein the workpiece collection member moves in a direction in which a horizontal line perpendicular to the rotation axis extends.   The drum type induction hardening apparatus according to claim 1, 2 or 3, further comprising positioning means for determining a position where the rotating body stops.

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