JPH0538032Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to an induction hardening device.

BACKGROUND TECHNOLOGY A conventional induction hardening apparatus for hardening multiple workpieces at the same time has a water supply pump 11 as shown in FIG.
A plurality of jackets 13a, 13b, 1 are provided on the outlet side of the
3c (three in the illustrated example) are connected to simultaneously harden multiple (or multiple types) of workpieces W, and are branched from piping 19, with the tips connected to each jacket 13a, 13b, and 13c. Solenoid valves 12a, 12b, 12c are provided in the middle of the three connected branch pipes 19a, 19b, 19c, respectively.

Problems to be Solved by the Invention However, in the case of the above-mentioned conventional example, first of all, the water supply pump 1 is connected to the coolant supply tank 10.
1, and a bypass 20 and valve 14 are provided, the structure around the coolant supply tank 10 becomes complicated and the device configuration becomes large, which has the disadvantage of requiring a large installation space. .

Second, since the water supply pump 11 is constantly driven, there is a drawback that the temperature of the coolant C in the coolant supply tank 10 increases due to the heat generated by the flow of the coolant C that does not contribute to quenching. be.

In addition, when quenching multiple types of workpieces W is being performed at the same time, when the quenching process for one workpiece W is completed and the solenoid valve at the corresponding position is closed, the quenching process is instantaneously completed. The flow rate of the cooling liquid C spouted from other jackets changes, which adversely affects the hardness of the quenching pattern, resulting in the disadvantage that homogeneous quenching cannot be achieved.

Incidentally, in such a case, the flow rate of the other jackets changes because the load on the water supply pump 11 changes rapidly.

The present invention has been made to eliminate the drawbacks of the prior art, and is capable of cooling multiple workpieces with a simple device configuration without causing a rise in the temperature of the coolant C in the coolant supply tank 10. The object of the present invention is to provide an induction hardening device that can perform homogeneous hardening.

Means for Solving the Problems The induction hardening apparatus according to the present invention includes a jacket provided for each of a plurality of heated workpieces and for spouting a cooling liquid for hardening onto the workpieces, and an internal A coolant supply tank is provided between the coolant supply tank and each of the jackets, the coolant is stored in the coolant, and the coolant is connected to the jacket with a water head 3 to 5 meters higher than the jacket. and a plurality of valves for controlling the supply and stop of the cooling liquid to each of the jackets, and a plurality of valves for controlling the supply and stop of the cooling liquid to each of the jackets, and collecting the cooling liquid after cooling the workpiece, recooling it, and supplying the cooling liquid to the cooling liquid supply tank. Equipped with recovery equipment for reflux.

Action In such cases, if you open multiple valves, 3 to 5
Due to the difference in positional water head of meters, the coolant pushed out from the coolant supply tank is ejected from each jacket, cooling each workpiece. On this occasion,
Even if the jetting of the coolant from the jacket of the workpiece that has been cooled is stopped, the amount of the coolant jetted from the other jackets is kept constant, so that uniform cooling is performed for all the workpieces.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an embodiment in which a plurality of workpieces W are hardened using the induction hardening apparatus of the present invention. , a plurality of jackets 13a, 13b, 13c (three in the illustrated example) are piped with a difference in water head at predetermined positions, and a solenoid is connected between the cooling liquid supply tank 10 and each jacket 13a, 13b, 13c. Valve 12a, 12b, 12c
are provided for each. In addition, 15 is a coolant recovery tank for recovering the coolant C after cooling the workpiece, and 16 is a high temperature coolant C recovered in the coolant recovery tank 15.
This is a return pump that supplies the coolant C to the recooling equipment 18 and returns the coolant C after recooling to the coolant supply tank 10.

Thus, each jacket 13a, 13b, 13
At the end of heating the workpieces Wa, Wb, and Wc provided on the side of c, each solenoid valve 12a, 12
When opening b and 12c, jackets 13a and 13
Cooling liquid C is ejected from b and 13c, respectively, and each workpiece is hardened.

Therefore, in the case of such a configuration, the flow rate of the cooling liquid C spouted from each jacket 13a, 13b, and 13c is determined only by the positional head, assuming that losses in the piping, etc., which are minute values, are ignored. Therefore, unlike the conventional case described above, even if any solenoid valve is closed during the quenching operation, the flow rate of the coolant C spouted from other jackets will not change. . Therefore, the hardness of the quenched pattern is not adversely affected. Note that the coolant supply tank 10
The position head is set in consideration of the flow rate of the coolant C required for homogeneous quenching, the capacity of the return pump 16, etc. In practice, 3 to 5 meters is desirable, and this position head is sufficient. cooling.

Modification Figure 3 shows the effects of the invention As explained above, the induction hardening apparatus of the invention is provided for each of a plurality of heated workpieces, and the induction hardening apparatus of the invention is provided for each of a plurality of heated workpieces. A jacket that spouts coolant, a coolant supply tank that stores the coolant inside and is connected to the jacket with a water head 3 to 5 meters higher, and the coolant supply tank. A plurality of valves are provided between each of the jackets to control the supply and stop of supply of cooling liquid to each of the jackets, and a valve for recovering the cooling liquid after cooling the work and recooling it. and a recovery facility for returning the coolant to the coolant supply tank. Therefore, when hardening multiple workpieces at the same time,
Even if the jetting of the cooling liquid for a given workpiece is stopped, the amount and pressure of the cooling liquid jetted to the other works do not change, so it is possible to uniformly cool a plurality of workpieces. Further, the cooling system of the induction hardening apparatus can have a simple positional configuration, and there is also an advantage that the temperature of the coolant in the coolant supply tank does not rise. Additionally, since the water head at the location of the coolant supply tank is 3 to 5 meters, it can be installed near the ceiling in a normal factory building, so it has the advantage of being able to be installed without being restricted by the building, etc. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional induction hardening apparatus, and FIG. 2 is a block diagram of an induction hardening apparatus according to an embodiment of the present invention. 10...Cooling liquid supply tank, 12a, 12b,
12c...Solenoid valve, 13a, 13b,
13c...Jacket, 15...Cooling liquid recovery tank, 18...Recooling equipment, C...Cooling liquid, Wa,
Wb, Wc...work.

Claims (1)

[Scope of utility model registration request] A jacket is provided for each of the plurality of heated workpieces and jets out a cooling liquid for quenching to the workpiece, and a jacket is provided for storing the cooling liquid inside and has a position water head of 3 with respect to the jacket. ~5
A cooling liquid supply tank is connected to the cooling liquid supply tank in a state of being elevated by a meter, and a plurality of cooling liquid supply tanks are provided between the cooling liquid supply tank and each of the jackets and control the supply and stop of the cooling liquid to each of the jackets. An induction hardening apparatus comprising: a valve; and recovery equipment that collects a cooling liquid after cooling the workpiece, recools it, and then returns it to the cooling liquid supply tank.