JPS61261470A - Continuous gas carburization hardening installation - Google Patents

Abstract

PURPOSE:To improve the working efficiency of a furnace and to improve considerably the productivity thereof by providing plural units of hardening vessels contg. different quenching media to an extraction port of the furnace so that the plural treating materials can be treated under different hardening conditions. CONSTITUTION:Plural units of immersion type hardening vessels 10a, 10b are disposed on the extraction side of a continuous gas carburizing furnace 1 and means for transferring the treating materials W are provided to constitute the titled carburization hardening installation. The vessels 10a, 10b have an extraction vestibule 15 communicating with the extraction port of the furnace and the different quenching media O are contained in the vessels 10a, 10b. The materials W emitted from the furnace 1 are immersed into the media O by elevator mechanisms 20a, 20b and are extracted from the vestibule 15.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to continuous gas carburizing and quenching equipment.

(Prior art and its problems) Conventional continuous gas carburizing and quenching equipment consists of a carburizing furnace and one quenching tank connected to the extraction section of the carburizing furnace, and the treated material is transferred to the furnace input side. The material is then sequentially transferred to the extraction side for carburizing treatment, after which it is quenched in a quenching tank and extracted outside the furnace.

By the way, in gas carburizing and quenching, the intended purpose cannot be achieved unless the quenching fluid (quenching oil) is selected depending on the shape, material, etc. of the material to be treated. For example, even if the same carburizing depth is to be obtained, materials with poor hardenability or thick walls may be treated in a quenching fluid (coal oil) maintained at a temperature of 60 to 80°C. Materials that need to suppress distortion need to be quenched in a quenching fluid (hot oil) maintained at a temperature of 120-140°C. That is, in the quenching treatment after carburizing, it is necessary to use a quenching liquid that corresponds to the treatment material and the purpose of the treatment in order to perform a good gas carburizing and quenching treatment.

Therefore, in continuous gas carburizing and quenching equipment, when changing the quenching conditions for the treated material, it is necessary to temporarily stop the furnace operation and replace the quenching liquid (quenching oil) in the quenching tank. is currently available.

(Problems of the Prior Art) However, the above-mentioned measures in continuous gas carburizing and quenching equipment result in poor furnace operation rate and a significant drop in productivity.

In addition, in order to deal with the diversification of processed materials, it is possible to arrange multiple batch-type carburizing furnaces and use different quenching fluids for the eight furnaces, but this method increases equipment costs and requires continuous processing. The productivity is poor compared to the formula.

(Means to Solve the Problems) The continuous gas carburizing and quenching equipment according to the present invention has been made to solve the above-mentioned conventional problems, and includes an extraction side of a continuous gas carburizing furnace that is connected to the furnace. A plurality of immersion type quenching tanks with vestibules are installed, and each quenching tank uses a different quenching liquid, and each quenching tank is used to quench the treated material discharged from the furnace. It is equipped with a transfer means that is immersed in the liquid and extracted from the extraction bestible.

(Example) Next, the present invention will be explained according to the drawings which are one example.

The continuous gas carburizing and quenching equipment shown in the drawings roughly consists of a continuous gas carburizing furnace 1, two quenching tanks 10a and 10b, and an extraction tank located above these quenching tanks to communicate and connect the quenching tanks 10a and 10b. It consists of a bestible 15, elevator mechanisms 20a, 20b and transfer mechanisms 40a, 40b provided in each of the quenching tanks 10a, 10b.

The quenching tanks 10a and 10b are arranged in parallel in front of the extraction port of the continuous carburizing furnace 1, and the extraction vestibule 15 is located almost in the center of the quenching tanks 10a and 10b. Oil stirring 111.11 is provided, and a jetting pipe 12 for jetting out the oil O stirred by the stirring 8!11 opens below the first material support portion 24 of the elevator mechanisms 20a, 20b, which will be described below.

The extraction bestible 15 is connected to each of the quenching tanks 10a, 10.
Above b, it is provided in communication with the extraction port of the continuous gas carburizing furnace 1, and the lower end 16 of the side plate is connected to the quenching tank 10a,
By immersing it in the quenching oil 10b, the inside of the extraction bestible 15 is isolated from the atmosphere, and the quenching tanks 10a and 10b are connected in communication.

Then, each quenching tank 1 on the other side of the extraction bestible 15
A material extraction port 18 is formed in the upper center of 0a, 10b, and the periphery of the opening is sealed by the lower end 16 of the side plate and the seal plate 17.

Moreover, a pair of rails 6 are arranged in the extraction bestible 15 so that the pressing claws 4 of the extraction device 3 are positioned up to the front of the elevator mechanism 20b of the quenching tank 10b.

As shown in FIG. 3, each elevator mechanism 20a, 20b is composed of an elevating member 21 that supports the material W and moves up and down, and a drive device 26 that moves this elevating member 21 up and down. The elevating member 21 includes a horizontally extending support 22, a column 23 located at the center of the support 22 and extending vertically, and two ends of the support 22, that is, an extraction bestible 15 and a material extraction port 18. 7 oak-shaped first doors protruding in the two directions of the furnace extraction door provided at positions corresponding to the first and second furnace extraction doors. The lifting drive device 26 is connected to a chain 29 moving through a sprocket 28 and one end of this chain 29 is connected to the upper part of the column 23 by the operation of a cylinder 27. connecting rod 30
It consists of

The elevating member 21 is provided with an idler roller 31, and is moved up and down guided by a guide rail 32 provided on a wall surface facing the furnace extraction door 2 in the quenching tank 10.

Each transfer mechanism 40a, 40b is located in oil O and is suspended and supported via guide rails 41 and rollers 42 provided near the wall surface on the furnace extraction port door 2 side of the quenching tanks 10a, 10b. It is composed of a fork-shaped material moving table 43 that protrudes in the direction of the support stands 22 of the elevator mechanisms 20a, 20b, and a reciprocating drive device (not shown) that reciprocates this moving table 43. has a quench 7-door 44 for bringing the oil O from the jet pipe 12 into uniform contact with the processing material W.

The material moving stage 43 is connected to the first material supporting section 2.
4 and the second material support section 25.

Note that the first and second elevator mechanisms 20a and 20b
The material support portions 24.25 are connected to each quenching tank 10a during the quenching process.
, 10b, the ejection pipe 12 has a groove 13 in which the protruding piece constituting the first material support part 24 fits, and the transfer mechanism 40a, 4
A groove 45 is also provided in the quench 7-door 44 of 0b.

Next, the operation of the continuous gas carburizing and quenching equipment constructed as described above will be described.

First, the quenching tank 10a is equipped with 12 tubes for hot quenching.
The quenching tank 10b contains a quenching liquid of 60 to 80°C for cold quenching, and the elevator mechanism 20a.

Each elevating member 21 of 20b rises to its first and second positions.
The upper surface of the material support 24,25 lies flush with the hearth line of the furnace.

On the other hand, parts that require hot quenching and parts that require cold quenching are loaded into the continuous gas carburizing furnace 1 as processing materials W, and the order in which these are charged, that is, the order in which they are extracted, is input into the computer. There are eight. When the heat treatment of the treated material W is completed in the continuous gas carburizing furnace 1, the furnace extraction door 2 is opened, and the treated material W is cold quenched by the pressing claw 4 of the extraction device 3 based on instructions from the computer. If it is a component, it is placed together with the tray 5 on the first material support section 24 of the elevator mechanism 20a.

Thereafter, the elevating member 21 is lowered to immerse the processing material W in the oil, and the transformer 778 located below! Structure 4
The material is transferred onto the material transfer table 43 at 0a, and oil quenching is performed in this state. On the other hand, the elevating member 21 further descends and waits at the bottom of the quenching tank 10a. When the hardening is completed, the material moving table 43 moves in the direction of arrow a in FIG. 3. After the movement is completed, the elevating member 21 starts to rise, and the processing material W on the elevating member 21 is transferred to the second material support portion 25 and returned to its original state. In other words, the treated material W comes out of the quenching tank 10a through the material extraction port 18. Thereafter, the material moving table 43 returns to its original position, and the hardened processing material W is transported to an appropriate position by means not shown.

Further, when the treated material W is a hot-hardened part, the treated material W is passed over the elevator mechanism 2Oa by the extraction device 3 and placed on the first material support part 24 of the elevator mechanism 20b, and the same as described above is carried out. Perform the process.

In the above embodiment, two quenching tanks 10a and 10b were installed in parallel at the extraction port of a continuous gas carburizing furnace, but in the case of a furnace having extraction ports on both sides, each One quenching tank may be provided9, or three or more quenching tanks may be provided.

In addition, in the examples, immersion of the treated material W in a quenching tank,
Although we have shown a model in which extraction is performed using one elevator,
Each may be performed in separate elevators.

(Effects) As is clear from the above description, according to the present invention, a plurality of quenching tanks with different quenching fluids are provided at the furnace bolthole, and the quenching tank is selected and used depending on the material to be treated. One continuous gas carburizing furnace can handle two or more types of materials with different quenching conditions, making it possible to significantly improve productivity compared to conventional furnaces.

In addition, the movement of the treated material in the quenching liquid is carried out using the elevator mechanism and the transfer mechanism as described above, and the treated material exiting the furnace extraction port is immersed in the quenching liquid by the elevator mechanism.
After that, the liquid is moved by a submerged transfusing mechanism, and the material is extracted from the material extraction port provided on the outside of the extraction bestible using the same elevator mechanism, so that the extraction bestible does not need an extraction door that communicates with the atmosphere. For,
The atmosphere inside the extraction bestible is not contaminated, and a large amount of purge is not required as in the conventional method, and energy can be saved accordingly. Furthermore, if the treatment material is immersed in and taken out from the quenching liquid using a single elevator mechanism as shown in the embodiment, there is an advantage that the overall structure is simpler.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing an example of continuous gas carburizing tank quenching equipment according to the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. FIG. 1... Continuous gas carburizing furnace, 10a, 10b... Quenching tank, 15... Extraction bestible, 18... Material extraction port,
20a, 20b...Elevator mechanism, 24...First
Material support part, 25... Second material support part, 32...
Idle rail, 40a, 40b...Transfer mechanism,
43...Material moving table, 44...Quenching 7-de, O
...Quenching liquid, W...Treatment material.

Claims (3)

[Claims] (1) On the extraction side of the continuous gas carburizing furnace, a plurality of submerged quenching tanks each having an extraction bestible communicating with the furnace extraction port are installed, and the quenching liquid in each quenching tank is mixed with a different quenching liquid. Continuous gas carburizing and quenching equipment, characterized in that each quenching tank is provided with a transfer means for immersing the treated material discharged from the furnace in a quenching liquid and extracting it from the extraction bestible. (2) The quenching tank has a material extraction port partitioned into the extraction bestible and the quenching liquid, and the transfer means is located below the extraction bestible and has a first material support and material extraction. an elevator mechanism including a second material support part located at the mouth; and a transfer mechanism provided with a material transfer table located in the quenching liquid and reciprocating between the two support parts,
The continuous gas carburizing and quenching equipment according to claim 1, wherein the quenched material is moved in a quenching liquid and extracted from the material extraction port. (3) The continuous gas carburizing and quenching equipment according to claim 1 or 2, wherein the plurality of quenching tanks are connected by a communicating extraction bestible.