JPH0321792Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a vertical heating device for high-frequency induction heating of a shaft component having a flange.

(Prior art) A conventional high-frequency induction heating type forging heating device consists of a plurality of heating coils arranged horizontally.
With this heating device, a shaft part with a flange 1b (hereinafter referred to as a work) 1 shown in FIGS. 5 and 6 is heated.
When heating the shaft portion 1a of the workpiece 1, the shaft portion 1a of the workpiece 1
A is inserted into a heating coil and heated by high frequency induction.

(Problem that the invention attempts to solve) However, in the above heating method, the workpiece 1
Since the shaft portion 1a must be inserted into the horizontal heating coil from the horizontal direction, it is very difficult to accurately set the heating length l of the shaft portion 1a.
The positioning mechanism and control system for the workpiece 1 become considerably complicated. Further, since it is necessary to hold the shaft portion 1a of the work 1 so that it can be inserted into the horizontal heating coil, the center of gravity of the work 1 cannot be checked, making the conveyance of the work 1 unstable. In particular, one end of the workpiece 1 is tilted about the chuck as a fulcrum, making it impossible to set the coil diameter small, making it difficult to obtain uniform heating, and reducing the heating efficiency of the shaft portion 1a.

The present invention was developed in view of the above problems, and by arranging the heating coil vertically and inserting the workpiece into it from above, it is possible to easily set the heating length, improve the stability of workpiece conveyance, and improve the heating This is intended to improve performance.

(Means for Solving the Problems) To achieve this objective, the means of the present invention is to arrange a plurality of high-frequency heating coils vertically, and to place a plurality of high-frequency heating coils in the holes of a support frame installed above the high-frequency heating coils. A sleeve-shaped support member that supports the flange of the shaft component and positions the heated portion of the shaft portion within the high-frequency heating coil is removably fitted, and the high-frequency heating coil is arranged above the support frame. A liftable jig that holds the shaft component in a hanging state by placing the flange on a conveying device arranged to be movable in the direction; and a liftable jig that holds the shaft component in a hanging state; The present invention is characterized in that a biasing means for pressing the jig is provided.

The heating method of this invention uses high frequency induction heating,
A plurality of high-frequency heating coils are arranged vertically. The number of coils varies depending on the heating cycle. Although the plurality of high-frequency heating coils are generally arranged in a straight line, they can also be arranged in a circular or square shape if necessary.

In order to make it possible to hold a wide variety of workpieces, the following method is used for stage changes. The heating length of the workpiece is determined by the height position of the shaft part relative to the high-frequency heating coil, but the height of the workpiece set can be adjusted by replacing the support member with one of a different height.
Allow settings to be changed.

It is desirable that the jig for holding the flange of the workpiece be formed into a multi-step shape so that it can accommodate a wide variety of flange diameters.

(Function) In this invention, when setting the workpiece,
By placing the flange on the support member, the shaft part is inserted into the high-frequency heating coil in a stable position in a hanging state, making it possible to reduce the gap between the flange and the high-frequency heating coil, improving the heating efficiency per hour for the entire workpiece. do. Furthermore, since the coil penetrates downward, there is no scale build-up and the coil life is extended. Since the insertion height of the workpiece is determined by the length of the support member, changing the stage of the workpiece only requires replacing the support member.

(Example) An example of the present invention will be described below with reference to the drawings. As shown in FIG. 1, three high-frequency heating coils 2, 3, and 4 are arranged vertically in a line at equal pitches. As illustrated in FIG. 2, a sleeve-shaped support member 5 is provided above the high-frequency heating coils 2, 3, and 4. It is removably placed and fixed in the hole.

A conveying device 7 is disposed above the high-frequency heating coils 2, 3, and 4, and the conveying device 7 is configured to reciprocate in the horizontal separation direction of the high-frequency heating coils 2, 3, and 4 by means of an air cylinder 8. There is. The conveyance device 7 is provided with four workpiece holding cushion cylinder biasing means 9, 10, 11, 12, and these cushion cylinders 9, 10, 11, 12
The pitch of the high-frequency heating coils 2, 3, and 4 is set to be the same as that of the high-frequency heating coils 2, 3, and 4. Further, the conveyance device 7 is provided with an air cylinder 13 facing downward, and a guide means 14 thereof.

A lift block 15 is coupled to the lower end of the piston rod 13a of the air cylinder 13 and the lower end of the guide shaft 14a of the guide means 14, and workpiece holding jigs 16, 17, 18, 19 are provided at four locations on the lower surface side of the lift block 15. are located directly below the cushion cylinders 9, 10, 11, and 12. Holding jig 16, 17, 18, 19
is for holding the lower surface of the outer periphery of the flange 1b of the workpiece 1, and as illustrated in FIG. An opening hole 21 into which the shaft portion 1a of the workpiece 1 is inserted is provided in a side portion thereof (the side portion in the left-right direction in FIG. 1). Therefore, the holding jig 16,1
The flange contact portions 20 of 7, 18, and 19 are the workpiece 1.
While the holding jigs 16, 17, 18, and 19 are positioned slightly below the flange 1b, the holding jigs 16, 17, 18, and 19 are moved toward the workpiece 1, and their shaft portions 1a are inserted into the flange abutting portions 20 through the opening holes 21. Thereafter, by displacing the holding jigs 16, 17, 18, and 19 upward, the workpiece 1 can be held in a hanging state.

Next, the operation of the embodiment will be explained.

First, the workpiece 1 at room temperature is sent to the workpiece positioning section 23 by the carry-in chute 22, and is pushed out toward the holding jig 16 side by an extrusion means (not shown), so that the flange 1b of the workpiece 1 is seated, and the workpiece 1 is held in the holding jig 16.
It will be transferred to and held there.

When the workpiece 1 is transferred and held on the holding jig 16,
The entire lifting block 16 is raised by the air cylinder 13, and the cushion cylinder 9 is lifted near the rising end.
The flange 1b of the workpiece 1 comes into contact with the tip of the piston rod 9a, and the rod 9a is shortened. Compressed air at a predetermined pressure (for example, about 4 kg/cm ² ) is supplied into the cushion cylinder 9, and the rod 9
By shortening a, a load equal to this supply air pressure multiplied by the cylinder inner diameter is applied to the workpiece 1, and the workpiece 1
is securely locked between the end of the rod 9a and the holding jig 16. After locking, the conveying device 7 and the lifting block 16 are moved by a predetermined pitch by the air cylinder 8, and then the lifting block 16 is lowered by the air cylinder 13, so that the shaft portion 1a of the workpiece 1 of the holding jig 16 is supported. The workpiece 1 is inserted into the high-frequency heating coil 2 through the inside of the member 5, and the lower surface of the flange 1b is placed on the upper end of the support member 5, thereby determining the heightwise position of the workpiece 1. The shaft portion 1a of the workpiece 1 is inserted by a predetermined length.

When the workpiece 1 is inserted into the high-frequency heating coil 2, the shaft portion 1a of the workpiece 1 is heated by the high-frequency power applied to the coil 2. After being heated by the high-frequency heating coil 2 for a predetermined time, the workpiece 1 is sequentially conveyed in the same manner as described above,
It is fed into the high frequency heating coil 4. The coil 4
At the exit, it is heated to the forging temperature (approximately 1250°C) (see Figure 4). Here, in order to average the heating temperature, the workpiece 1 is connected to the high-frequency heating coil 2,
While moving within 3 and 4, high frequency power is controlled.
Thereafter, the workpiece 1 heated to the forging temperature by the high-frequency heating coil 4 is taken out from the carry-out chute 24 and sent to the next process. Note that t ₂ , t ₃ , and t ₄ in FIG. 4 indicate heating times by coils 2, 3, and 4.

In this embodiment, cushion cylinders 9, 10, 11, and 12 are attached to the transfer device 7 to stabilize the posture of the workpiece 1 during transfer.
Since the locking action is completed at the same time as the temperature rises, the transport time can be shortened.

Next, when changing the setting of the heating length l of the shaft portion 1a in a stage change operation accompanying a change in the specifications of the workpiece 1, it is completed by simply replacing the support member 5 with an appropriate one. In addition, when changing the dimensions of the flange 1b of the workpiece 1, the workpiece holding jigs 16, 17, 18, 1
By making the shape of 9 a multi-stage concentric circle,
No stage changes are required.

In addition, in the embodiment, the holding jigs 16, 17, 18,
The operation cycles of raising, feeding, lowering, and returning No. 19 were performed using air cylinders 8 and 13, but electric cylinders and
It may be actuated by a hydraulic mechanism.

(Effects of the invention) As described above, according to the invention, the support member provided on the upper part of the high-frequency heating coil also serves as a mechanism for adjusting the insertion height position of the shaft component. Not only can the heating length of the shaft component be easily set by simply placing it on the shaft and hanging it down, but the setting of the heating length of the shaft component can also be changed by simply replacing the support member.

In addition, since the shaft parts can be held securely using the pressing force of the biasing means provided in the transport device, the shaft parts can be transported reliably without the need for a clamp/unclamp mechanism as in the past. , the workpiece transport time is shortened by the time required for clamping and unclamping. By the way, the conventional device required 16 seconds to convey one piece, but the device of this invention takes 12 seconds to convey one piece.
It only took one piece per second.

Furthermore, the shaft component is inserted into the high-frequency heating coil in a stable posture while hanging in the same vertical direction as the direction of gravity, and the gap between the outer diameter of the shaft (heated part) and the inner diameter of the high-frequency heating coil can be set small. As a result, the heating surface becomes more uniform than in the past, and the heating efficiency is increased, so a significant energy saving effect can be expected. Since no scale buildup occurs on the coil, its lifespan is increased.

[Brief explanation of the drawing]

FIG. 1 is an overall front view showing an embodiment of the present invention;
Figure 2 is a detailed sectional view of the part shown in Figure 1 when the workpiece is set, Figure 3 is a plan view of the holding jig shown in Figure 1, Figure 4 is a graph showing the temperature rise characteristics of the shaft component, and Figure 4 is a graph showing the temperature rise characteristics of the shaft component. FIG. 5 is a front view of the workpiece, and FIG. 6 is a view taken along the arrow in FIG. 1... Work (shaft part), 1a... Shaft part, 1b
... Flange, 2, 3, 4 ... High frequency heating coil, 5 ... Support member, 7 ... Conveyance device, 9, 1
0, 11, 12...Cushion cylinder, 15...
... Lifting block, 16, 17, 18, 19... Work holding jig.

Claims (1)

[Scope of utility model registration request] A plurality of high-frequency heating coils are arranged vertically, and a flange of a shaft component is placed and supported in a hole of a support frame installed above the high-frequency heating coils, so that the heated portion of the shaft is connected to the high-frequency heating coil. A sleeve-shaped support member positioned inside the shaft member is removably fitted, and the flange is placed on a conveying device that is disposed above the support frame so as to be movable in the arrangement direction of the high-frequency heating coils, and the shaft component is suspended. The invention is characterized in that it is provided with a jig that can be raised and lowered to hold the shaft in the same state, and a biasing means that presses the shaft component against the jig by coming into contact with the end face of the flange of the shaft member that rises with the jig. Vertical heating device for flanged shaft parts.