JPH05271777A - High-frequency heating method of crank shaft - Google Patents

Abstract

PURPOSE:To provide a method, by which the cost of an equipment as a high-frequency heating apparatus for journal parts and pin parts in a crank shaft is not so expensive and the heating process is not so long. CONSTITUTION:After a first process wherein the journal parts 111-113 are heated with heating coils C11, C12 and C13 arranged to three journal parts 111-113 at one end side of the crank shaft 100 among five journal parts 111-115 having a mutually same shape, in a second process, the heating coils C11, C12 and C13 are shifted to a rotating axis 120 direction of the crank shaft 100, and thereafter, the remained journal parts 114, 115 are heated with the heating coils C11, C12. In this second process, the electric current is not conducted to the heating coil C13 and laid on the center 124 having the same diameter as the journal parts 111-115. Otherwise, this heating coil C13 is not shifted to the heating position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency heating method for a crankshaft, and more particularly to a high frequency heating method for a crankshaft having three or more pins and three or more journals.

[0002]

2. Description of the Related Art Conventionally, in order to induction heat all the pins and journals of a large number of crankshafts having three or more pins and three or more journals, for example for quenching, a first heating station is used. After heating all the pins of one crankshaft at the same time,
Move to the heating station, 1 at the second heating station
It is common practice to heat all the journals of a book's crankshaft at the same time. In this way, by simultaneously heating all the pins of one crankshaft at the first heating station and simultaneously heating all the journals at the second heating station, The whole heating process can be shortened.

[0003]

However, in the above-mentioned conventional high-frequency heating method for the crankshaft, all the pins or journals of one crankshaft are heated at the same time, which is necessary for this heating. As a result of an increase in the amount of electric power used, a high-frequency heating device with a large output is required, and there has been a problem that capital investment in such a high-frequency heating device also increases.

On the other hand, depending on the process plan of the high frequency heating work of the crankshaft, it is not always necessary to shorten the total heating process more than necessary. In this case, the heating process is lengthened to a certain extent. By adopting a high-frequency heating device with a small output, the equipment investment of the high-frequency heating device can be reduced. However, it goes without saying that it is necessary to avoid making the heating process extremely long by reducing this capital investment.

The present invention was devised in view of the above circumstances, and when high frequency heating of a large number of crankshaft pins and journals, the equipment investment of the high frequency heating device does not become too large, and the heating An object of the present invention is to provide a high-frequency heating method for a crankshaft, in which all the journals or pins of one crankshaft are heated in two steps so that the steps do not become too long.

[0006]

In order to solve the above problems, the method of high frequency heating of a crankshaft according to the present invention is 3
In a high-frequency heating method for a crankshaft having one or more same-shaped journals or pins, half or one rounded up journals or pins on one end side of the crankshaft are provided for each of these journals or pins. The method includes a first step of heating with the high-frequency heating coil, and a second step of moving the high-frequency heating coil in the direction of the rotation axis of the crankshaft and then heating the remaining journals or pins with the high-frequency heating coil.

Then, in the second step, a high frequency heating coil which is not used for heating the journal or pin on the other end of the crankshaft is mounted on a center which has the same diameter as the journal or pin and supports the other end of the crankshaft. However, the high-frequency heating coil can be de-energized.

Further, in the second step, it is possible to prevent the high frequency heating coil, which is not responsible for heating the journal or pin on the other end side of the crankshaft, from moving to the heating position.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 are drawings for explaining the present embodiment, FIG. 1 is an explanatory view of a high frequency heating method of a journal, FIG. 2 is an explanatory view of another high frequency heating method of a journal, and FIG. 3 is a high frequency of a pin. FIG. 4 is an explanatory view of a heating method, and FIG. 4 is a sectional view taken along line XX of FIG.

The crankshaft 100 shown in FIGS.
A crankshaft for a four-cylinder engine, which has four identical pins 101-104 and five identical journals 111-
115, and one pin is arranged between the pair of journals. 120 for each journal 111-115
It is a straight line connecting the centers of and and is the rotation axis of the crankshaft 100. The crankshaft 100 and the rotary shaft 120
When viewed from the direction of, the pins 101 and 104 at both ends and the pins 102 and 103 at the central portion are located on the opposite side with respect to the rotation shaft 120.

In the following, the pins 101 to 104 of the crankshaft 100 are heated in two steps in the first heating station,
Journals 111-115 at the second heating station
The heating method of heating in 2 steps will be described.

As shown in FIG. 3, in the first heating station A, the crankshaft 10 in which the rotary shaft 120 is horizontally arranged.
0 has one end held by the chuck 121 and the other end supported by the center 122 and is kept in a rotatable state.

A high-frequency heating coil is provided above the pins 101 and 102 (hereinafter, the high-frequency heating coil is simply referred to as a heating coil).
The standby position U1 of the heating coil C1, C2 is disposed at the standby position U1.
Is a transformer T1 via lead conductors D1 and D2,
Connected to T2. The heating coil C1, the lead conductor D1 and the transformer T1 are mechanically coupled and fixed. The same applies to the heating coil C2, the lead conductor D2, and the transformer T2. Transformer T1 is a flexible cable K1 and switch
Through W1 and also transformer T2 is a flexible cable
Each of them is connected to a high frequency power source H1 via K2 and a switch W2.

Next, the operation of heating the pins 101 to 104 by high frequency will be described. By rotating the chuck 121 by a rotation drive device (not shown), the crankshaft
For example, 100 is rotated about the rotation axis 120 in the direction of arrow S. Then, the heating coil transfer device M1 lowers the transformers T1 and T2 in the direction of arrow R to move the heating coil C.
1 and C2 are placed on the pins 101 and 102, respectively, via spacers (not shown) (FIG. 4). Then switches W1, W2
By closing the high frequency power supply H1 to each transformer T1, T2
Is connected to the heating coils C1 and C2 by applying a high frequency current to heat the pins 101 and 102. When heating is completed, the switches W1 and W2 are opened.

After that, by the heating coil transfer device M1,
The heating coils C1 and C2 are raised in the direction opposite to the arrow R. Then, the transformer for heating coil M1 is also used.
T1 and T2 in the direction of arrow P (rotation axis of crankshaft 100)
(Direction 120) and then descend in the direction of arrow R to place heating coils C1 and C2 on pins 103 and 104, respectively.
The heating is performed in the same manner as the heating of 101 and 102. Then, the transformers T1 and T2 are raised in the direction opposite to the arrow R, and then the arrow P
Move it in the opposite direction to the original standby position U1 and push the pin 10
The heating steps 1 to 104 are completed. The crankshaft 100 is then sent to the second heating station.

As shown in FIG. 1, also in the second heating station B, the crankshaft in which the rotary shaft 120 is horizontally arranged.
One end of 100 is held by a chuck 123, and the other end is rotatably supported by a center 124. The diameter of the center 124 is equal to the diameter of the journals 111-115.

Above the journals 111 to 113 is the standby position U2 of the heating coils, and the heating coils C11, C12 and
C13 is arranged, and these heating coils C11, C12 and C13 are respectively lead conductors D11, D12 and D1.
Connected to transformers T11, T12 and T13 via 3. Heating coil C11, lead conductor D11 and transformer
T11 is also mechanically fixed. Heating coil C12
, Lead conductor D12 and transformer T12, as well as heating coil C13, lead conductor D13 and transformer T1.
The same applies to 3. Transformer T11 is connected via flexible cable K11 and switch W11 and also to transformer T12.
Via flexible cable K12 and switch W12, and transformer T13 is flexible cable K13 and switch W1.
Each is connected to the high frequency power supply H2 via 3.

Next, the operation of heating the journals 111 to 115 by high frequency will be described. By rotating the chuck 123 by a rotation driving device (not shown), the crankshaft 100 is rotated about the rotation axis 120 in the direction of arrow S, for example. The transformers T11, T12 and T13 are simultaneously lowered in the direction of the arrow R by the heating coil transfer device M2 to place the heating coils C11, C12 and C13 on the journals 111, 112 and 113, respectively. Connect the transformers T11, T12 and T13 to the high frequency power supply H2 by closing the switches W11 to W13 and heating coils.
A high frequency current is passed through C11, C12 and C13 to heat the journals 111-113. When heating is completed, switches W11 to W13 are opened.

After that, the heating coils C11, C12 and C13 are raised in the direction opposite to the arrow R by the heating coil transfer device M2. Similarly, the heating coils C11, C12 and C13 are moved in the direction of the arrow Q by the heating coil transfer device M2 and then lowered in the direction of the arrow R to lower the heating coils C11, C12.
And C13 are mounted on journals 114, 115 and center 124, respectively. As described above, since the diameter of the center 124 is made equal to the diameter of the journals 111 to 115, the heating coil C13 is placed at the same time when the other heating coils C11 and C12 are placed on the journals 114 and 115, respectively. 124
Placed on top.

Then, without closing the switch W13,
Closing switches W11 and W12 only, journals 111 to 11
The heating of the journals 114 and 115 is performed in the same manner as the heating of 3. When the heating is completed, the switches W11 and W12 are opened, the heating coils C11, C12 and C13 are moved up in the direction opposite to the arrow R by the heating coil transfer device M2 and then moved in the direction opposite to the arrow Q to return to the original standby position U2. Transport to. This completes the heating process of the crankshaft 100.

In the above embodiment, when heating the journals 114 and 115, the heating coil C1 mounted on the center 124 is used.
High frequency current was not applied to 3, but instead of this, as shown in FIG. 2, after moving the transformers T11, T12 and T13 in the direction of the arrow Q, the journals 114 and 115 were moved.
When heating the heating coil C13, keep the transformer T13 alone in the direction of the arrow R so that the heating coil C13 is
May not come into contact with.

For example, if all the pins of the crankshaft having 5 pins and 6 journals are heated in 2 steps and all the journals are heated in 2 steps, 3 pins are required for heating the pins. Heating coils, and three heating coils are also required to heat the journal.

In such a case, in the second heating step of the pin, only one heating coil is not used for heating the pin, but in the same manner as in the case of heating the journals 111 to 115 of the crankshaft 100, The diameter of the center may be made equal to the diameter of the pin, and the heating coil may be placed on the center so as not to energize, or not to be lowered.

[0024]

As described above, according to the high frequency heating method of the crankshaft of the present invention, in the high frequency heating method of the crankshaft having three or more same-shaped journals or pins, half of the one side of the crankshaft, Alternatively, the first step of heating the journals or pins of which the number is rounded up to half by the high frequency heating coils provided for each of these journals or pins, and moving the high frequency heating coils in the direction of the rotation axis of the crankshaft. And the second step of heating the remaining journals or pins by the high-frequency heating coil.

Then, in the second step, a high frequency heating coil which is not used for heating the journal or pin on the other end of the crankshaft is mounted on a center which has the same diameter as the journal or pin and supports the other end of the crankshaft. However, the high frequency heating coil can be de-energized. Further, in the second step, it is possible to prevent the high frequency heating coil, which is not responsible for heating the journal or pin on the other end side of the crankshaft, from moving to the heating position.

Therefore, the high-frequency heating method of the crankshaft of the present invention does not heat all the journals or pins at the same time as in the conventional case, but all the journals or pins of one crankshaft are heated. Since heating is performed in two steps, the heating power is reduced, so that the equipment investment cost of the high frequency heating device can be reduced, and the entire process of heating a large number of crankshaft journals and pins can be accommodated in an appropriate length. In addition, in the second step, the heating coil, which is not used for heating, is placed in the center without being energized, or the heating coil is not moved to the heating position. It is possible to give consideration to safety so as not to damage the

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of a high frequency heating method for a crankshaft according to the present invention, showing a case where a journal is heated.

FIG. 2 is an explanatory view of another embodiment of the high-frequency heating method for crankshafts of the present invention, showing the case of heating a journal.

FIG. 3 is an explanatory diagram of a high frequency heating method for a crankshaft according to the present invention, showing a case where a pin is heated.

FIG. 4 is a cross-sectional view taken along the line XX of FIG.

[Explanation of symbols]

 100 crankshaft 101-104 pin 111-115 journal 120 rotating shaft C1, C2, C11, C12, C13 heating coil

Claims (3)

[Claims] 1. A method for high-frequency heating of a crankshaft having three or more same-shaped journals or pins, comprising:
A first step of heating a half or a rounded-up number of journals or pins on one end side of the crankshaft by a high frequency heating coil provided for each of these journals or pins, and the high frequency heating coil And a second step of heating the remaining journals or pins by the high frequency heating coil after moving the same in the direction of the rotation axis of the crankshaft. 2. In the second step, a high frequency heating coil, which is not used for heating the journal or pin on the other end side of the crankshaft, is mounted on a center having the same diameter as the journal or pin and supporting the other end side of the crankshaft. The high-frequency heating method for a crankshaft according to claim 1, wherein the high-frequency heating coil is placed in place and the high-frequency heating coil is not energized. 3. The high frequency heating method for a crankshaft according to claim 1, wherein, in the second step, the high frequency heating coil which is not used for heating the journal or the pin on the other end side of the crankshaft is not moved to the heating position.