JPS6217131A - Remelting hardening treatment and apparatus - Google Patents

Abstract

PURPOSE:To form chill layer having uniform thickness and hardness, by providing a revolving shaft to treating apparatus, grasping a material to be treated by an arm attached to the revolving shaft, revolving the shaft intermittently to respective positions of both serving as throwing and delivering, preheating and heating to treat the material continuously in order. CONSTITUTION:A member W to be treated is received by a clamp mechanism 11 at top end of the arm 10 attached to the revolving shaft 7 from a chuck mechanism 29 of a delivering member 26, and the material W is grasped. The shaft 7 is revolved to position the material W to a preheating station S2, and the material W is preheated by electricity conduction heating. The shaft 7 is further revolved to position the material W to a heating station S3, and a prescribed place is remelted then cooled rapidly and chilled by self cooling. The shaft 7 is further revolved to position the treated member W to a station S1 serving both as throwing and delivering. The member 26 is shaken to grasp the member W by the mechanism 29 and to deliver it to the member 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for remelting and hardening iron-based members such as camshafts.

(Prior technology) It is known that the cam lift part of a camshaft is remelted using plasma arc, etc., and the remelted part is rapidly cooled to chill it, thereby increasing the hardness of the surface of the cam lift part and improving its wear resistance. It is being

When performing such remelting hardening treatment on a member to be treated such as a camshaft, the part to be remelted must be at an angle of 200 to 450°.
Preheating to a certain degree will ensure uniform melting, as well as
This is necessary to obtain uniform hardness.

For this reason, in the past, a remelting and hardening treatment device and a preheating device were installed separately, and the workpiece to be treated was first set in the preheating device.
After preheating it to a predetermined temperature, the workpiece is removed from the preheating device 2, and the preheated workpiece is transferred to the remelting hardening device by a conveying device that connects the preheating device and the remelting hardening device. First, the member to be treated is set in a remelting and hardening treatment apparatus, and then subjected to a remelting and hardening treatment.

(Problems to be Solved by the Invention) As mentioned above, in the past, the remelting and hardening treatment equipment and the preheating equipment were installed separately, which resulted in a large volume occupied by the entire equipment, and It is necessary to set and set the remelting hardening treatment equipment individually, which is cumbersome and time-consuming, and furthermore, according to the conventional method,
The preheated workpiece must be transported from the preheating device to the remelting and hardening treatment device, during which time the workpiece is cooled or the temperature varies, forming a chilled layer with uniform hardness. There are problems such as not being able to do so.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a remelting and hardening treatment apparatus with a rotating shaft, attaches three arms to the rotating shaft, and attaches three arms to the tips of these arms. A loading/unloading station, a preheating station, and a heating station are arranged at equal intervals along the rotation locus of the clamping mechanism for the workpiece, and the rotation of the arm accompanying the intermittent rotation of the single rotation axis , the workpiece gripped by the tip of the arm is transferred from the loading and unloading station to the preheating station.
The materials were sequentially transferred from the preheating station to the heating station, and further from the heating station to the loading/unloading station, so that they were continuously processed at substantially the same location.

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

Fig. 1 is a side view of the remelting and hardening processing apparatus according to the present invention, Fig. 2 is a front view of the same, and Fig. 3 is a plan view of the same. A frame (2) is erected, a support box (3) containing a power supply, etc. is fixed to this frame (2), a control box (4) is installed behind this support box, and a cooling device is installed above. (5), and furthermore, plasma power supply hooks (6) and (8) are arranged on the left and right sides of this cooling device (5).

In addition, the remelting and hardening processing apparatus (1) includes a loading and unloading station (Sl) 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 workpiece (W), and each of these stations (S+), (S2), (S3
) The rotating shaft (7) is arranged 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 by a signal from the control box (4), for example, 1.
It is assumed that it rotates intermittently by 20'.

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

This clamp mechanism (11) is connected to the case (11) as shown in Fig. 4.
9) The lot (+3) of cylinder unit (12) arranged in the left and right members (I) of the arm (10)
The left and right members (10a) and (10a) have fingers (
The intermediate parts of fingers (14) and (15) are pivotally connected, and the rear ends of these fingers (14) and (15) are linked (lB) and (1
8) to the rod (13), and operates the cylinder unit (12) to cause the rod (13) to protrude, thereby opening the fingers (14) and (15), and opening the fingers (14) and (15). (Trade) release the grip state of the rod (13
) by causing the finger (14) to make a retraction motion.
, (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 weighed slightly, the workpiece (W) does not fall,
The fingers (14), (+5
) is closed and the workpiece to be processed (W) is clamped,
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. Then, by rotating the rotation shaft (7), the clamp mechanism (11)
The rotation locus is at each station (S+).

(S2) and (S3) are substantially passed through.

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 traveling head (18). A motor (18) is attached to the traveling head (18), and by driving this motor (19), the traveling head (+8) 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). Dispensing member (21) dispensing from Sθ
The charging member (20) consists of a cylinder unit (22) fixed to the running head (18) and a clamp mechanism (23) provided at the rod end of this cylinder/tick unit (22). 2) By the operation of (22), the clamp machine a (23) moves up and down between the loading and unloading station (S+) and a position above and in front of this station (Sl). Also, the dispensing member (21) includes a cylinder unit (24) fixed to the running head (18) in the same way as the input member (20), and a clamp mechanism provided at the rod tip of this cylinder (22) (24). (
When the cylinder unit (24) is operated, the clamp mechanism (25) moves to the loading and unloading station (25).
S+) 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 (2B) fixed to the box (3), and the arm (27) swings back and forth (left and right in No. 11i1) centering on the middle part when the cylinder unit (28) is operated. ing. and.

A clamp mechanism (29) similar to the above is provided at the upper end of the arm (27), and when the arm (27) swings due to the operation of the cylinder unit (28), the clamp mechanism (
29) shows the rotation locus of the clamp mechanism (11) provided at the tip of the arm (10), the clamp mechanism (23) at the lower end of the input member (20) and the dispensing member (2), (
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. 5, an energization heating device (32) as a preheating device is attached to the tips of the row and door (31) of these cylinder units (30).

This energization heating device fit (32) holds a cylindrical body (33), a piston body (34) slidably disposed within this cylindrical body (33), and an end of the member to be processed (W). The cylindrical main body (33) has a holding member (35) that contacts the first cylindrical body (33a) and a conductive member (3) that abuts the end face of the member to be processed (3). Cylindrical body (33b) and third
The first cylinder (33a) is connected to the tip of the rod (31) through an insulating material (37).
(38), and this first cylindrical body (33a
) is fixed to the front surface of the second cylinder body (33b) by a bolt (39), and the rear surface of this second cylinder body (33b) and the first cylinder body
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, the third cylindrical body (33c) has a flange portion (42) formed in the middle portion, and a hole (43) formed in this flange portion (42).
and the second cylindrical body (33b) are positioned by inserting a pin (45) into the hole (40) formed on the front surface thereof, and
The acid threaded portion (48) of the tightening member (41) is attached to the second cylinder (3).
3b) By screwing into the male threaded part (47) carved on the outer periphery, the flange part (48) of the tightening member (41) connects the flange part (42) of the third cylinder (33c) to the third cylinder body (33c). 2 cylindrical body (33
b) Fix it by pressing it against the side.

Further, the front end of the third cylinder (33c) has an ampulla (48).
A fixing member (50) is fixed to this enlarged portion (49) with a bolt (51), and a portion of the fixing member (50) is secured to the outer side of the holding member (35) between this fixed member (50) and the enlarged portion (49). A protruding flange portion (52) is sandwiched therebetween. The front end of the holding member (35) has a flange portion (5) that protrudes inward.
3), and an opening into which the end portion of the member to be processed (W) is inserted is formed inside the flange portion (53).

On the other hand, the piston body (34) is connected to the first piston body (34).
4a), and a second piston body (34b) fixed to the tip of the first piston body (34a) by a pin (54), and the rear end of the first piston body (34a). faces into the space (40) formed between the front surface of the first cylindrical body (33a) and the rear surface of the second cylindrical body (33b), where the second cylindrical body (33b) As shown in FIG. 6, a copper plate laminate (5B) is attached to the rear surface, which is connected to a power source by a bolt (55).
) is attached to the rear end surface of the first piston body (34a) by a pole (57).

Furthermore, a spring (5 days) is installed inside the first cylinder (33a).
The front end of this spring (58) is supported by a spring seat (58), and this spring seat (58) has a head (57a) of the bolt (57).
) comes into contact.

The elastic force of the spring (58) biases the piston body (34) forward to the extent that the laminated body (56) bends, and this biasing 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 (36) with the end surface of the member to be processed (su), 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 flange portion (Wa) of the member to be processed.

The heating station (S3) also includes a heating device (6
1) is placed. The heating device (61) has a support (62) erected in the support box (3), and this support (82)
a pair of support plates (83), (83) spaced apart laterally;
The first motor (64) and the second motor (θ5) are fixed to the outside of these support plates (83) and (83) as shown in FIG. 6, and the support plates (63) and ( 8
3) A case (67) is attached via a stay (66) between them.

A pair of first movable bases (88) and a second movable base (69) are provided inside the case (87), and these movable bases (ea
).

A plasma torch (70) connected to the plasma Tf, 1ACF3) is attached to the lower end of (89). In addition, guide rods (71), (71) installed laterally within the case (67) pass through the movable tables (88), (89), and the guide rods (71), (71) extend through linear slide bearings (72).
Mobile platform (88).

(B3) is slidable along the guide rod (71).

In addition, a pole screw (73) and a spline rod (74) commonly pass through the movable bases ($8) and (llt!9), and these pole screws (73) and spline rod (74) are attached to the case (67). It is rotatably supported, one end of the pole screw (73) is connected to the drive shaft (64a) of the first motor (60), and one end of the spline rod (74) is connected to the drive shaft (64a) of the second motor (65). Shaft (135a)
is connected to.

Then, the first ball nut (
75) and second pole nut (7B) are screwed together, the first ball nut (75) is fixed to the first moving table (68), and the second ball nut (76) is an inner sleeve which is a rotating body. It is fixed to (77). This inner sleeve (77) is rotatably fitted onto the pole screw (73) and is also fitted with a bearing on the outer sleeve (78) fixed to the second moving table (69).
79), and is regulated from moving in the axial direction with respect to the outer sleeve (78).

Furthermore, a gear (80) is attached to one end of the inner sleeve (77).
are spline-fitted, and this gear (80) and the gear (81) fitted to the spline rod (74) are meshed with each other. In addition, (82) in Fig. 6 is a dust seal.

(83) is a stopper.

In the above, when the first motor (64) is driven, the pole screw (73) rotates, and when the pole screw (73) rotates, the first ball nut (75) and the second ball nut (7B) try to rotate. do. However, the first ball nut (75) is attached to the first moving table (68).
The second pole neck (7B) is fixed to the inner sleeve (77), and the second pole neck (7B) is fixed to the inner sleeve (77).
77) is fitted with a gear (80), and this gear (80) is connected to the second motor (85) (not being driven at the moment).
The gear (
81), so it ended up being the first pole
(75) and the second ball nut (7B) do not rotate, but instead spiral along the pole screw (73).

As a result, the first moving table (68) and the second moving table (68)
8) moves synchronously.

Further, when the second motor (65) is driven, the spline rod (74) rotates, and the spline rod (74) rotates.
The gears (81) and (80) rotate with the rotation of the gear (80).
) rotates the inner sleeve (77) and the second ball nut (7[1). However, the pole screw (
73) does not rotate, so use the second pole nara) (7B)
spirally moves along the pole lunge (73) while rotating, and as a result, only the second moving platform (69) moves to the left or right.

In this way, since the first and second movable tables (88) and (H) can be moved in synchronization, the plasma torches (70) and (70) do not interfere with each other, and the second Since it is also possible to move only the moving table (69), for example, when remelting two cam lift parts of a camshaft at the same time, the interval between the cam lift parts can be set to 1.
Even if the actual camshaft is different, it can be efficiently remelted.

Further, the heating device (61) can be moved up and down by a vertical movement unit (84) arranged on the support column (62).

Further, a laser position detection device (85) is arranged behind the plasma torch (70), and this position detection device (85) detects the end face of the cam portion of the camshaft, which is the member to be processed (11), and the plasma torch The plasma torch (70) is moved in the axial direction by a signal from the position detection device (85) so that the cam part is accurately positioned on the arc from the plasma torch (70).

Further, chuck devices (se), (8B
), and these chuck devices (8B), (as)
The chuck device (87) holds both ends of the workpiece (Ill) by the
By rotating 6), the member to be processed (W) is rotated 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).
Grasp approximately the center of the unprocessed workpiece (K) with the clamp mechanism (23) of 0), and drive the motor (19) again to move the traveling head (!8) to the center of the device (1). let

Next, the cylinder unit (22) of the input member (20)
is activated to lower the clamp mechanism (23) diagonally downward and remove the workpiece (
-) to the clamp mechanism (28) of the transfer member (26).

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, we installed 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 receiver passes the workpiece (-) to the clamping mechanism (11) of ).

After this, the rotation axis (7) is rotated 120° counterclockwise in Figure 1.
Rotates and preheats the workpiece (W) to the preheating station (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 wire, the electric heating device (32)
Electricity is applied to the member to be processed (W) via the laminate (5B), the piston body (34), and the conductive member (36), and the member to be processed is preheated to about 200 to 450°C.

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 (8B) and (8G) placed on both sides of the heating station (S3) hold both ends of the member to be processed (W).

Next, the plasma torches (70), (70) 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, when the member to be processed (W) is a camshaft, a plasma torch (70)
, (70) so that their tips face one end of the cam lift.

Once the plasma torches (70) and (70) are positioned at the predetermined positions, the gripping state by the crank mechanism (11) is loosened, and the chuck device (86) is rotated by driving the motor (87). Chuck device (86
), while rotating the workpiece (W) around its axis, the plasma arc from the plasma torches (70) and (70) re-melts the workpiece (W) at a predetermined location. The melting depth is shallow and only the surface area is melted, so after melting, heat is rapidly transferred to areas other than the fused area, and the material is rapidly chilled by self-cooling, forming a part with high hardness and excellent wear resistance. do.

Thereafter, the rotary shaft (7) further rotates 120' counterclockwise to position the processed workpiece (W) at the loading and unloading station (Sl). Then, the transfer member (2B) swings clockwise, and the transfer member (26) uses the clamp mechanism (29) to transfer the processed material (
W) is released from the gripping state by the clamp mechanism (11), and the workpiece (W) is transferred to the transfer member (2).
The arm (27) of the transfer member (26) swings counterclockwise at a predetermined angle, and the workpiece (W) is transferred to the clamp mechanism (28). 11) Take it out of the rotation trajectory.

Then, when the workpiece (W) is taken out of the rotation locus of the clamp mechanism (11), the cylinder unit (24) of the dispensing member (21) is activated, and the clamp mechanism (2
5) is lowered and the workpiece is removed at the lowering end.
grasp. In addition, the dispensing member (21) and the inputting member (20
) are controlled so that they do not descend at the same time, so that they do not interfere with each other at the lower end.

In this way, the clamping mechanism (
After the processed workpiece (W) is gripped by the cylinder unit (25), the cylinder unit (20) is activated to pull the workpiece upward, and the entire traveling head (18) is further moved by the drive of the motor (18). , 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 remelting hardening treatment method according to the present invention, one device can carry in an untreated workpiece,
Preheating of the part to be processed, remelting and rapid hardening of the part to be processed,
Furthermore, it is extremely efficient since it is possible to take out the processed workpiece.

In addition, by attaching an arm equipped with a clamping mechanism to one rotating shaft and rotating the single rotating shaft intermittently, the workpieces gripped by the clamping mechanism can be moved through the loading/unloading station, preheating station, and heating station. Since they are moved sequentially, there is no need to provide a special conveyance device like in the past, and the preheated workpiece can be heat-treated immediately, so the thickness and hardness of the chilled layer to be formed can be made uniform. can do.

Moreover, since there is no need to separately install a preheating device and a conveyance device for the entire device, many effects such as efficient use of space can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a side view of the remelting hardening treatment apparatus according to the present invention, FIG. 2 is a front view of the same apparatus, FIG. 3 is a plan view of the same apparatus, and FIG.
The figure is an enlarged view of the clamp mechanism, FIG. 5 is a sectional view of the preheating device, and FIG. 6 is a sectional view showing the moving mechanism of the heating device. In the drawings, (1) is the remelting hardening processing device, (3) is the support box, (7) is the rotating shaft, (lO) is the arm, and (II
), (23), (25), and (29) are clamp mechanisms,
(18) is a traveling hend, (20) is a charging member, (21)
(26) is a delivery member, (32) is a preheating device, (61) is a heating device, (70) is a plasma torch, (85) is a cooling air jet nozzle, (86) is a chuck device, (S]) is the loading and unloading station, (S2)
is a preheating station, (S3) is a heating station, (
W) is a member to be processed. Patent applicant Kida Giken Kogyo Co., Ltd. Agent Patent attorney 2 1) Yuu ~ Buma Patent attorney Kuni Ohashi Patent attorney Yoshiro Koyama Udo Patent attorney No
1) Shigeru Figure 4 Procedural Amendment (Voluntary) ■, Indication of the Case Japanese Patent Application No. 157661/1986 2, Name of the Invention Remelting Hardening Treatment Method and Apparatus 3, Person Making the Amendment Relationship with the Case Patent Applicant ( 532) Honda Motor Co., Ltd. 4, Agent 2-4-5 Azabudai, Minato-ku, Tokyo, Date of amendment order Voluntary 8, List of attached documents-h? 'l:5aFE+ (Hemi I PM
mOFA)
I u? . 7. Contents of Supplement +E (1) The detailed description of the invention column in the specification is corrected as follows. (b) Delete the phrase "same as above" in the second line of page 10 of the specification. (b) From the second line to the third line of page 10 of the specification,
Page 10, line 4, page 18, line 16, page 18, line 2
From line 0, page 19, line 4 to line 5, the second
On the 8th line of each page 1, there is a “Clamp mechanism (29) J
The statement ``Chuck mechanism (29) J is corrected. (c) Lines 4 to 6 of page 17 of the specification are corrected as follows. powder supply unit) (8
4) is arranged, and the high hardness alloy powder from this unit 7) (!34) is supplied into the plasma arc. (d) Delete r(29)J from page 23, line 20 of the brief explanation of the drawings section of the specification. (2) Figures 1 and 2 are corrected as attached.

Claims (4)

[Claims] (1) An unprocessed workpiece is gripped by the tip of an arm attached to a rotating shaft at the loading and unloading station, and then the rotating shaft is rotated by a predetermined angle to transfer the workpiece gripped by the arm tip to the preheating station. After the workpiece is preheated at this preheating station, the rotary shaft is rotated by a predetermined angle again to transfer the workpiece held at the tip of the arm to the heating station, where the workpiece is heated. The surface is heated and remelted, and the remelted part is rapidly cooled and hardened, and then the rotating shaft is rotated by a predetermined angle to transfer the processed workpiece gripped by the tip of the arm to the loading and unloading station. A remelting and hardening processing method, characterized in that a processed workpiece is delivered at a combined delivery station. (2) Three arms are provided at equal intervals in the rotational direction of the rotating shaft, and by gripping the workpiece at the tip of each arm, loading or unloading the workpiece, preheating, and heating process can be done in a timely manner. 2. The remelting and hardening method according to claim 1, wherein the remelting and hardening treatment is carried out in such a manner that they overlap. (3) An arm is attached to a rotating shaft that rotates intermittently by a predetermined angle, a clamping mechanism for the workpiece is provided at the tip of this arm, and the rotation trajectory of the clamping mechanism as the rotating shaft rotates is approximately A loading/unloading station, a preheating station, and a heating station for the workpieces to be processed are arranged at equal intervals at coincident locations. 1. A remelting and hardening processing apparatus characterized in that a preheating device such as an energization heating device is disposed, and a heating device such as a plasma torch is further disposed in a heating station. (4) The remelting hardening according to claim 3, wherein the rotating shaft rotates in a constant direction every 120 degrees, and three arms are attached at equal intervals in the rotating direction. Processing equipment.