JPS6217122A - Resistance heater - Google Patents

Abstract

PURPOSE:To make the press contact force of a conducting member to a member to be treated uniform to uniformly preheat said member by inserting a piston body into a cylindrical body of a device and energizing the piston body by a spring member. CONSTITUTION:The piston body 34 is freely slidably disposed into the cylindrical body 33 of a resistance heater 32. The body 34 is energized by the spring force of a spring 58, etc. so that the conducting member 36 disposed in a holding member 35 contacts under pressure with the end face of the member W to be treated. Electricity is conducted to the member W via a laminated body 56, piston body 34 and conducting member 36 of the resistance heater 32 to preheat the member W. The press contact force of the conducting member 36 is made always equal by such heating means and the preheating temp. of each member W to be treated is made uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrical heating device used for preheating as a pretreatment when remelting and hardening the surface of an iron-based member, for example.

(Prior technology) The idea is to re-melt the cam lift part of the camshaft using a plasma arc, etc., and then rapidly cool the re-melted part to chill it, increase the hardness of the surface of the cam lift part, and improve wear resistance. It will be done.

In this way, in order to remelt a part of the camshaft using a plasma arc or the like, the camshaft must be heated to
Preheating to about 450° C. is necessary for uniform melting and efficiency.

Generally, an electrical heating device is used for such preheating. A pair of these current heating devices are prepared, and each is attached to the rod of a cylinder unit ( ), and both ends of the camshaft are held by the operation of the cylinder unit, and in this state, the conductive member inside the current heating device is brought into contact with the camshaft. At least it is energized and heated by this energization.

(Problems to be Solved by the Invention) In the above-mentioned electrical heating device, in order to bring the electrically conductive member into contact with the camshaft, the rod of the cylinder unit to which the electrical heating device is attached is made to protrude in the direction of the camshaft. conduct. When the length of the camshaft is changed, the amount of protrusion of the rod is changed accordingly.

However, even camshafts of the same standard have slightly different dimensions, and it is difficult to absorb this dimensional difference by adjusting the amount of protrusion of the cylinder rod. When the conductive member has a step shape with a camshaft, it is difficult to bring the conductive member into even contact with the step, and as a result, the pressing force of the conductive member against the camshaft is not uniform, making it difficult to heat uniformly. Moreover, there is a problem in that there is a difference in preheating temperature for each camshaft.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes a piston body that is slidably inserted into a cylindrical body of an electrical heating device, and a piston body that is installed inside the cylindrical body. A resilient member is used to urge the projecting direction.
This urging force causes the conductive member provided between the tip of the piston and the end surface of the member to be processed to be brought into pressure contact with the end surface of the member to be processed with a constant pressing force.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a side view of a remelting hardening treatment apparatus to which the electrical heating device according to the present invention is applied, and FIG. 2 is a front view of the same apparatus.
The remelting and hardening treatment apparatus (1) has a frame (2) erected on the floor, a support box (3) containing a power supply etc. is fixed to this frame (2), and a control box (3) is installed behind this support box. 4), a cooling device (5) above, and a plasma power supply box (6) on the left and right of this cooling device (5).
), (8) are arranged.

In addition, the remelting and hardening treatment apparatus (1) includes a loading and unloading station (S+) for loading and unloading the workpiece (W) such as a camshaft, and a preheating station (S2) for preheating the workpiece (W). and a heating station (S3) for remelting the member to be processed, each of these stations (S+), (S2), (S3
) is located at an intermediate position. This rotating shaft (7) is rotated via a motor (8) fixed to the support box (3) and a speed reduction mechanism, and the amount of rotation is controlled intermittently by, for example, 120' in response to a signal from the control box (4). It is assumed that it rotates as follows.

A case (9) having a substantially hexagonal shape in side view is provided in the center of the rotating shaft (7), and three wooden arms (lO) project outward from the case (9). There is. These arms (10) are attached at a distance of 120'M from each other, and a clamp mechanism (11) is provided at the tip of each arm (10).

This clamp mechanism (11) is attached to the case (11) as shown in Fig. 3.
9) The rod (
13) to the left and right members (10
a), (10a), and these left and right members (1
0a), (1(la) has a finger (14
), (15) (7) The middle parts are pivotally connected, and the rear ends of these fingers (14) and (15) are connected to links (1B) and (I
It is pivotally connected to the rod (13) via the cylinder unit (12) and causes the rod (13) to project, thereby opening the fingers (14) and (15), and opening the fingers (14) and (15). Release the grip on the member (W) and pull the rod (1
3) by making a retraction movement, the finger (14)
, (15) are closed to grip the member to be processed (W). The tip of one finger (15) is a bifurcated portion (15a) facing the member to be processed (W), and is a finger (14).

Even if (15) is slightly weighed, the member to be processed (W) does not fall and is held rotatably between the bifurcated portion (15a) and the finger (14), and the fingers (14), (15)
When closed, the member to be processed (W) is clamped at three points so that the center of the member to be processed (W) is always constant. The rotation locus of the clamp mechanism (11) by rotating the rotation axis (7) once is determined by each station (S).
+), (S2), and (S3).

Further, a rail member (17) is fixed to the front surface of the upper horizontal frame (2a) of the frame (2), and this rail member (17) is fixed to the front surface of the upper horizontal frame (2a) of the frame (2).
7) is engaged with the 12 door (18) for travel. A motor (19) is attached to the traveling head (18), and by driving this motor (19), the traveling head (18) moves laterally along the rail member (17) via a rack and pinion mechanism. .

The running head (18) includes a loading member (20) for transporting unprocessed workpieces (W) to the loading and unloading station (S+), and a loading and unloading station (S+) for loading and unprocessed workpieces (W). The dispensing member (21
), and the input member (20) is a running head (1 day).
It consists of a cylinder unit (22) fixed to the cylinder unit (22) and a clamp mechanism (23) provided at the rod end of this cylinder unit (22).
2) causes the clamp mechanism (23) to move up and down between the loading and unloading station (S+) and a position above and in front of this station (S+). In addition, the dispensing member (21
) consists of a cylinder unit (24) fixed to the running head (18) in the same way as the input member (20), and a clamp mechanism (25) provided at the rod end of this cylinder unit (24). (24) The clamp mechanism (25) moves up and down between the loading and unloading station (Sl) and the position directly above this station (S+).

Further, a transfer member (26) is disposed below the loading/discharging station (Sl). The bridge member (26) swingably attaches the intermediate part of the arm (27) to the flange (27a) protruding forward from the front surface of the support box (3), and supports the lower end of the arm (27). It is connected to the rod of the cylinder unit (28) fixed to the box (3), and when the cylinder unit (2B) is operated, the arm (27) moves back and forth around the middle part (left and right in Figure 1).
I'm trying to make it oscillate. A clamp mechanism (29) similar to the above is provided at the upper end of the arm (27), and the arm (27) is operated by the cylinder 22 (2B).
7) swings, the clamp mechanism (29) rotates between the rotation locus of the clamp mechanism (11) provided at the tip of the arm (10) and the clamp mechanism at the lower end of the input member (20) and the dispensing member (21). (23) and (25).

Further, in the preheating station (S2), the second
As shown in the figure, a pair of cylinder units (30) on the left and right,
(30), and as shown in FIG. 4, an energizing device (32) according to the present invention is attached to the tip of the rod (31) of these cylinder units (30).

This energization heating device (32) includes a cylindrical body (33), a piston body (
34), a holding member (
35) and a conductive member (36) that comes into contact with the end face of the member to be processed (W), and the cylindrical main body (33) has a first cylindrical body (33a) and a second cylindrical body (33b). and a third cylindrical body (33c), the first cylindrical body (33a) is connected to the tip surface of the rod (3 parts) via an insulating material (37).
38), and a second cylinder (33b) is fixed to the front surface of this first cylinder (33a) by a pole (39), and the rear surface of this second cylinder (3:lb) and 1st
A space (40) is formed between the front surface of the cylindrical body (33a) and the front surface of the cylindrical body (33a). Further, a third cylinder (33c) is attached to the second cylinder (33b) via a tightening member (41). That is, as shown in FIG. 5, the third cylindrical body (33c) has a flange part (42) formed in the middle part, and the hole (43) formed in this flange part (42) is connected to the second cylindrical body (33c). The position is determined by inserting the pin (45) into the hole (44) formed in the front surface of the tightening member (41).
B) is carved into the outer periphery of the second cylindrical body (33b).
47), the flange portion (48) of the tightening member (41) is engaged with the flange portion (42) of the third cylinder (33c).
) is fixed by pressing it against the second cylindrical body (33b).

Further, the front end of the third cylinder (33c) has an ampulla (48).
A fixing member (50
) is fixed with a bolt (51), and this fixing member (50
) and the enlarged portion (49), the flange portion (52) protruding outward of the holding member (35) is held between the flange portion (52) and the enlarged portion (49). A flange portion (53) projecting inward is formed at the front end of the holding member (35), and an opening into which the end portion of the member to be processed (W) is inserted is formed inside the flange portion (53). ing.

On the other hand, the piston body (34) is connected to the first piston body (34).
4a), and a second piston body (4a) fixed to the tip of the first piston body (34a) with a bolt (54).
34b), and the rear end portion of the first piston body (34a) is connected to the front surface of the first cylindrical body (33a) and the second cylindrical body (34b).
As shown in FIG. 6, the second cylindrical body (33b) faces into the space (40) formed between the rear surface of the second cylindrical body (33b) and the rear surface of the second cylindrical body (33b). A-layer body (56) of copper plate is added, and this laminate body (58)
The middle part of the piston body (34a) is attached to the rear end surface of the first piston body (34a) by a pin (57).

Furthermore, a spring (58) is provided within the first cylindrical body (33a).
The front end of this spring (58) is supported by a spring seat (59), and this spring seat (59) has a head (57a) of the port (57).
) comes into contact.

The elastic force of the spring (5 days) urges the piston body (34) forward to the extent that the laminated body (5B) bends, and this urging force causes the piston body (34) to be disposed within the holding member (35). The conductive member (3B) is pressed against the end surface of the member to be processed (W).

Here, a conductive plate (60) that is difficult to oxidize, such as a silver plate, is provided at the contact portion of the conductive member (38) with the end surface of the member to be processed (W), and a flange portion (53) of the holding member (35) is provided. ) is also provided with a conductive plate (60) at the contact portion with the end surface of the seventh rung portion (Wa) of the member to be processed.

FIG. 7 is a diagram showing the disassembled state of the energization heating device (32), and by removing the tightening member (41) from the second cylindrical body (33b), the third cylindrical body (33c) and the conductive Parts (3B
) can be easily removed from the device (32).

By doing this, when the length or diameter of the member to be processed (W) is changed, the third cylinder (33c), the holding member (35), the conductive member (36)
) Furthermore, the problem can be easily dealt with by replacing the second piston body (34b) etc. with one of a different size.

The heating station (S3) also includes a heating device (6
1) is placed. The heating device (81) has a support (82) erected in the support box (3), and the support (62)
a pair of support plates (83), (83) spaced apart laterally;
Install guide rods (1114), (84) and pole screws (83) between these support plates (83), (83).
65), and the moving head (66) is screwed onto this pole screw (65), and the guide rod (84) is installed.
), (84) are inserted into the guide hole of the moving head (66), and the pole screw (65) is further rotated by the motor (67) fixed to the support plate (63), so that the moving head (8B) is attached to the guide rod. (134), (84)
I am trying to move left and right along the . A pair of plasma torches (88) and (88) as heating members are attached to the moving head (8B). This plasma torch (88) can be moved up and down by the operation of a vertical movement unit (63), and is connected to the plasma power supply box (
8), by being connected to (8) and applying high frequency,
A high-temperature plasma arc is ejected toward a predetermined location on the workpiece.

Further, a laser position detection device (70) is arranged behind the plasma torch (88), and this position detection device (7o) detects the end face of the cam shaft of the camshaft, which is the member to be processed (-), and the plasma torch The plasma torch (68) is moved in the axial direction by a signal from the position detection device (70) so that the cam portion is accurately positioned on the arc from the plasma torch (68).

Further, on both sides of the heating station (S3) below the plasma torch (88), there are chuck devices a (71), (7
1) Place and attach these chucks! (71), (71
) to hold both ends of the workpiece (W), and the chuck device (71) via the motor (72) and deceleration mechanism.
) is rotated to rotate the member to be processed (W) around the axis.

The operation of the remelting and hardening processing apparatus (1) having the above structure will be described below. In addition, when explaining, each arm (
10) The clamping device (11) at the tip part is used to clamp the workpiece (W
) is not grasped as a starting point.

First, by driving the motor (19) of the traveling head (18), the unprocessed workpiece (W
) to a certain place, and insert the input material (2).
0), the unprocessed workpiece (W
) and drive the motor (18) again to move the running head (18) to the center of the device (1).

Next, the cylinder unit (22) of the input member (20)
is activated to lower the clamp mechanism (23) diagonally downward and remove the workpiece (
W) is transferred to the clamp mechanism (28) of the transfer member (28).

Then, the cylinder unit (28) is activated, and the arm (27) of the transfer member (26) swings clockwise in Fig. 1, and is held by the clamp mechanism (29) at the tip of the arm (27). The member to be processed (W) overlaps the rotation locus of the clamp mechanism (11) provided at the tip of the arm (lO).

Therefore, a clamp mechanism (
11) to grip the workpiece (W), release the gripping state by the clamp mechanism (29), and release the gripping state by the arm (10).
) The member to be processed (W) is passed to the clamp mechanism (11) of the receiver.

After this, the rotation axis (7) is rotated 120° counterclockwise in Figure 1.
Rotates and preheats the workpiece (S2)
to be located. Specifically, when the rotation shaft (7) rotates 120" and the clamp mechanism (11) reaches the lowest position, the rotation of the rotation shaft (7) is stopped, and the holding member of the electrical heating device (32) (35), the member to be processed (
While holding both ends of the buttocks), the electric heating device (32
), the member to be processed (W) is preheated to about 200 to 450 degrees by applying electricity to the member to be processed (W) via the laminate (56), the piston body (34), and the conductive member (3B).

When the preheating is completed, the holding state by the electrical heating device (32) is released, and the one-rotation shaft (7) is again rotated 120 degrees counterclockwise in FIG.
W) is placed in the heating station (S3). Then, chuck devices (71), (71) placed on both sides of the heating station (S3) hold both ends of the member to be processed (W).

Next, the plasma torches (13B) and (88) move up and down and left and right, so that the tips of the torches face the part of the workpiece (W) to be remelted. Specifically, the member to be treated (su)
If the camshaft is used as a plasma torch (88
), (8B) so that their tips face one end of the cam lift.

Once the plasma torches (88) and (88) are positioned at predetermined positions, the chuck device (71) is rotated by driving the motor (72), and the workpiece is rotated by the rotation of the chuck device (71). While (W) is rotated around its axis, a predetermined portion of the member to be processed (W) is remelted by plasma arc from plasma torches (8B) and (88). Furthermore, since the melting depth at this time is shallow and only one surface portion is melted, after melting, heat is rapidly transferred to other parts than the melted part, resulting in rapid cooling and chilling by self-cooling.
Forms parts with high hardness and excellent wear resistance.

Thereafter, the one-rotation shaft (7) further rotates 120' counterclockwise to position the processed workpiece (W) at the input/discharge station (S+). Then, the transfer member (26) of the receiver swings clockwise, and the transfer member (2B) uses the clamp mechanism (29) to hold the processed material (
At the same time, the gripping state by the clamp mechanism (11) is released, and the workpiece (-) is held by the transfer member (W).
26) Uke is handed over. Next, the cylinder unit) (2
8), the arm (27) of the transfer member (28) swings counterclockwise by a predetermined angle, and the workpiece (W) is taken out of the rotation locus of the clamp mechanism (11).

When the workpiece (W) is taken out of the rotation locus of the clamp mechanism (I), the cylinder unit (24) of the dispensing member (21) is activated, and the clamp mechanism (25
) is lowered, and the workpiece (W) is gripped at the lowered end. In addition, the dispensing member (21) and the input member (20)
It is controlled so that the two do not descend at the same time, and so that they do not interfere with each other at the lower end.

In this way, the clamping mechanism (
After the processed workpiece is gripped by the cylinder unit (25), the cylinder unit (20) is actuated to pull the workpiece upward, and the motor (19) is driven to move the workpiece into motion.
The whole door (18) moves and transports the processed member (W) to the next process or the like.

By repeating the above operations, the object to be treated can be continuously remelted and hardened at the same location.

(Effects of the Invention) As explained above, according to the electrical heating device according to the present invention, the piston body is slidably inserted into the cylindrical main body, and the piston body is biased by an elastic member such as a spring. However, since the conductive member is brought into pressure contact with the workpiece by this biasing force, even if there is a slight manufacturing error in each workpiece, the pressure contact force of the conductive member is always the same, so that the preheating temperature can be reduced. There is no variation in temperature, and the preheating temperature of each member to be treated does not differ locally. Therefore, when remelting and hardening treatment is performed later, a chilled layer with a uniform thickness can be formed. It has many effects.

[Brief explanation of the drawing]

Fig. 1 is a side view of a remelting and hardening processing apparatus to which the energizing heating device according to the present invention is applied, Fig. 2 is a front view of the same device, Fig. 3 is an enlarged view of the clamp mechanism, and Fig. 4 is an energizing heating device. 5 is a view taken from the direction AA in FIG. 4, FIG. 6 is a view taken from the direction BB in FIG. 4, and FIG. 87 is an exploded view of the electrical heating device. In the drawings, (1) is a remelting and hardening processing device, (3) is a support box, (7) is a rotating shaft, and (lO) is an arm. (11), (23), (25), (29) are clamp mechanisms, (20) is a charging member, (21) is a dispensing member, (2B) is a receiving member, (32) is an energization heating device,
(33) is a cylindrical body, (33a) is a first cylindrical body, (33
b) is the second cylinder, (33c) is the third cylinder, (34)
is a piston body, (34a) is a first piston body, (34
b) is the second piston body, (35) is the holding member, (36
) is a conductive member, (41) is a tightening member, (56) is a laminated body, (58) is a spring, (68) is a plasma torch,
(S+) is an input/discharge station, (S2) is a preheating station, (S3) is a heating station, and (W) is a member to be processed. Patent applicant: Honda Motor Co., Ltd. Agent
Person Patent Attorney Part 2 1) Patent Attorney, Department, Department Kuni Ohashi, Patent Attorney, Department, Department
Koyama Fuma Patent Attorney No 1)
Shigeru Figure 5 4,5 Figure 6. Drawing procedure amendment (voluntary) September 30, 1985 1, Indication of the case Patent Application No. 157662/1988 2, Name of the invention Electrification heating device 3, Person making the amendment Relationship to the case Patent applicant (532) Honda Motor Co., Ltd. 4, Agent 5, Date of amendment order Voluntary 6, ``Specification subject to amendment 7, Detailed explanation of the invention column of the specification of contents of the amendment is corrected as follows. (b) Delete "same as above" on page 8, line 12 of the specification. (b) From line 12 to line 13 on page 8 of the specification, from line 14 to line 15 on page 8, line 20 on page 14, line 4 on page 15, From line 8 to line 9 on page 15, and line 11 on page 17, "clamp mechanism (29) J" is replaced with "chuck mechanism (29)".
) Correct it as J. (c) From line 6 to line 7 of page 13 of the specification, “
Vertical movement...and delete the text. (d) Insert the following sentence between page 13, line 10 and line 11 of the specification. ``In addition, there is an alloy powder supply 22) (8
9) is arranged to supply high hardness alloy powder from this unit (89) into the plasma arc. (e) Delete r (29) J on page 19, line 19 of the brief description of drawings section of the specification.

Claims (1)

[Claims] In an electrical heating device that heats a material to be processed by holding both ends of the material and applying electricity, this electrical heating device is slidably disposed within a cylindrical body and A piston body that is urged in the protruding direction by an elastic member provided therein, a member for holding the member to be processed provided at the tip of the cylindrical body, and a connection between the tip of the piston body and the end face of the member to be processed. 1. An electrically conductive heating device comprising: a conductive member interposed therebetween and brought into pressure contact with an end surface of a member to be processed by a piston body.