JP5092170B2 - Carburizing and quenching method and carburizing and quenching apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for improving the productivity of carburizing and quenching of steel parts.
[0002]
[Prior art]
The carburizing and quenching treatment of steel parts is usually performed by a temperature raising process in which the article to be treated is heated to a predetermined carburizing temperature, a carburizing diffusion process in which carbon penetrates the surface of the article to be treated and diffuses inside (hereinafter simply referred to as a carburizing process). Called), a quenching temperature holding step (provided that the carburizing temperature and the quenching temperature are different), and a quenching step. The carburizing process is usually processed at a temperature of 1223K or less because it dislikes the coarsening of the crystal grains of the product to be processed. Recently, however, the temperature exceeds 1273K in order to shorten the lead time of the carburizing process. Sometimes it is done. In this case, in order to refine the crystal grains of the processed product coarsened in the carburizing process, a primary cooling process for cooling the processed product to a temperature below the A1 transformation point after the carburizing process, and then the processed product A reheating process is added to heat up to the quenching temperature.
[0003]
Such carburizing and quenching treatment is often performed in a continuous furnace type or batch furnace type furnace. For example, as disclosed in Japanese Examined Patent Publication No. 06-99794, a continuous furnace is loaded with a tray loaded with articles to be processed at regular intervals, and is sequentially heated, carburized, diffused, and cooled. Each process of carburizing and quenching is continuously performed by quenching. The batch furnace is connected to a carburizing chamber for raising the temperature of the product to be treated, carburizing and diffusing, and then lowering the temperature to the quenching temperature, and a quenching chamber for quenching the product to be treated which is held at the quenching temperature in oil. Depending on the method of loading and extracting the processed product, for example, a straight-through type as disclosed in JP-B 05-14025 and an in-out type as disclosed in JP-B 62-4464, for example, There is.
[0004]
[Problems to be solved by the invention]
Unlike the time when mass production technology and mass production equipment were required for carburizing and quenching of steel parts, it is now possible to flexibly respond to production fluctuations and enable efficient production with little waste even in small quantities. There is a need for production systems or equipment.
[0005]
However, in the conventional continuous furnace method, when a large amount of articles to be processed with a constant processing condition is processed, it is possible to operate with high productivity and efficiency, but wasteful time is required for changing the processing condition. Or the lack of flexibility to increase or decrease production. On the other hand, in the batch furnace method, the time for which the workpiece is occupied in the quenching chamber, that is, the so-called lead time is usually significantly shorter than the lead time of the carburizing chamber, and the operation is performed in a state where the utilization efficiency of the quenching chamber is extremely low. ing. Moreover, in the in-out type batch furnace, since the charging and extraction ports for processed products are also used in the quenching chamber, new processed products cannot be charged unless the processed products are extracted from the quenching chamber. The structure is low and the productivity is low compared to a straight-through batch furnace.
[0006]
As described above, the conventional carburizing and quenching method and apparatus have a problem that flexibility is impaired for the purpose of improving productivity, while facility utilization efficiency is impaired for the purpose of flexible operation. there were.
[0007]
[Means for Solving the Problems]
  In order to solve the above-described problem, the carburizing and quenching method according to the present invention described in claim 1 is a carburizing and quenching process in which a steel part is a workpiece, and the workpiece is a carburizing unit and a quenching unit.Placed on the left and rightIs provided through a partition door for vacuum insulation betweenCarryingTo the feeding unit,The transport unit is held under a reduced pressure that does not oxidize the processed product, and the supply of the processed product to the transport unit can be vacuum-insulated either before or after the transport unit. Is performed by opening an appropriate charging door, the article to be processed is transferred from the transport unit to the carburizing unit,In the carburizing unit, the carburizing diffusion process, or the article to be processed after the diffusion process is completed, through the transport unitAboveAfter transferring to the quenching unit and closing the partition doorInPerform quenching processIn the quenching unit, the extraction door disposed at the position facing the partition door is opened to take out the article to be processed from the quenching unit.It is characterized by that. According to the carburizing and quenching method shown in claim 1, since the transport unit is provided between the carburizing unit and the quenching unit, the carburized diffusion process or the workpiece to be processed after the diffusion process is transferred from the transport unit to the quenching process. After that, the next article to be processed can be transferred to the carburizing process via the transport unit while leaving the article to be treated in the quenching process as it is.Further, since the carburizing unit, the transfer unit, and the quenching unit are arranged in a straight line, there is an advantage that the layout is simple and the facility is easy to install. In addition, since the extraction door of the quenching unit is arranged at a position facing the partition door, the workpieces are transferred on a single straight line throughout the entire carburizing and quenching process. There is also an advantage that it can be simplified. Furthermore, since the removal of the product to be processed from the quenching unit is performed by opening the extraction door of the quenching unit, even when oil is used as the quenching medium, the inside of the apparatus is not contaminated by the oil.
[0008]
  The carburizing method according to the present invention described in claim 2 is,PreviousIn the carburizing unit, the carburizing diffusion process, or the processed product after the diffusion process has been completed, the subsequent steps of primary cooling, reheating, and quenching are performed between each process.Transfer of processed products inVia the transport unitDoIt is characterized by that. According to the carburizing and quenching method shown in claim 2, the productivity of various carburizing and quenching processes, particularly high-temperature carburizing processes, can be improved.
[0010]
  Claim 3The carburizing and quenching apparatus according to the present invention described in the above is a carburizing and quenching processing apparatus that uses steel parts as articles to be processed. The carburizing unit that performs the carburizing diffusion process of the article to be processed and the article to be processed that has finished the carburizing diffusion process A quenching unit that performs the quenching processPlaced on the left and right,A transport unit as a vacuum sealed container for transferring the article to be processedArranged so as to be sandwiched between the carburizing unit and the quenching unit, and provided with a partition door for vacuum insulation between the carburizing unit and the transfer unit and between the quenching unit and the transfer unit. In addition, a charging door capable of vacuum insulation for charging the processed product is provided either before or after the transfer unit, and an extraction door for removing the processed product is provided at a position facing the partition door in the quenching unit.It is characterized by that.
This claim3According to the carburizing and quenching apparatus shown in FIG. 1, the carburizing and quenching method shown in claim 1 can be effectively carried out, and in particular, the productivity can be improved with respect to the in-out type batch furnace.
[0011]
  Claim4One embodiment of the carburizing and quenching apparatus described inIn claim 3,Multiple carburizing unitsEachConnected to the transport unit through a partition doorContinuedAnd features. This claim4According to the carburizing and quenching apparatus shown in claim 1,3It is possible to provide an apparatus that improves the utilization efficiency of the quenching unit in the carburizing and quenching apparatus described in 1 and improves the productivity of the carburizing and quenching process.
[0012]
  Claim5The carburizing and quenching apparatus according to the present invention described inIn the carburizing unitA primary cooling unit that performs a primary cooling process for cooling the article to be processed that has finished the charcoal diffusion process to an A1 transformation temperature or lower.The primary cooling unit is connected to the transport unit through a partition door for vacuum insulation.This claim5According to the carburizing and quenching apparatus shown in FIG. 1, by using the carburizing unit as a unit for reheating to the quenching temperature of the article to be treated, the carburizing temperature higher than 1223K so that the crystal grains of the article to be treated are coarsened. Can be handled flexibly.
[0014]
  Claim6One embodiment of the carburizing and quenching apparatus described inOne in the primary cooling unitA reheating unit for performing a reheating process in which the workpiece to be processed after the next cooling process is heated to a quenching temperature and held.The reheating unit for vacuum insulationConnected to the transport unit via a partition doorIt is what is done.This claim6According to the carburizing and quenching apparatus shown in Fig. 4, the productivity of the carburizing and quenching apparatus can be further improved by using a dedicated unit for carrying out the carburizing process and the reheating process.
[0016]
  Claim7An embodiment of the carburizing and quenching apparatus according to claim 1 is characterized in that a plurality of reheating units are connected to the transport unit via partition doors.TheThis claim7According to the carburizing and quenching apparatus shown in FIG. 4, the use efficiency of the quenching unit and the primary cooling unit can be improved, and the productivity of the carburizing and quenching process can be remarkably improved by including the plurality of reheating units..
[0018]
    As described above, in the carburizing and quenching method and apparatus of the present invention,Charging /A product to be processed having a temperature similar to room temperature inserted through a loading door provided in a transfer unit, which is a vacuum sealed container for transfer, is treated as an acid.Turn intoIt is kept under a reduced pressure of a certain level and transferred to a carburizing unit that is kept at a predetermined processing temperature in advance through a partition door. Therefore, the predetermined temperature raising step, carburizing step, and quenching temperature holding step are performed at about atmospheric pressure or under reduced pressure.
[0019]
      When the quenching temperature holding process is completed, the product to be treated at the quenching temperature is converted to acid.Turn intoIt is transferred to the quenching unit via the transfer unit under a reduced pressure and quenched. As described above, since the article to be processed heated to a high temperature is transferred to each unit under reduced pressure, the process proceeds to the next step with almost no decrease in temperature. The transfer unit is insulated from the carburizing unit and the quenching unit by the partition door, so that it can be returned to the atmosphere. After that, the next product to be processed is charged into the transfer unit and subsequently carburized and quenched as described above. Can be performed.
[0020]
In recent years, carburizing treatment in which the effective hardening depth exceeds 1 mm is performed by so-called high-temperature carburizing treatment which is performed by increasing the diffusion rate of carbon at a high temperature exceeding 1223 K in order to shorten the carburizing time. Yes. Therefore, as described above, various carburizing and quenching treatments are performed by connecting a primary cooling unit that cools the workpiece to be processed after the carburizing process at a high temperature exceeding 1223 K to the A1 transformation temperature or less in a short time. The primary cooling process is a process of about 20 minutes depending on the cooling capacity, and the lead time of the high-temperature carburizing process can be shortened.
[0021]
Further, the article to be treated that has been primarily cooled is then transferred to the carburizing unit and reheated to the quenching temperature. In the quenching process, the article to be treated is quenched at a temperature of about 1173 to 1073 K, which is lower than the carburizing temperature. It is normal. Therefore, as described above, by performing the reheating step separately in a reheating unit dedicated to maintaining the quenching temperature connected to the transport unit, a waiting time until the temperature of the carburizing unit is lowered to the quenching temperature is not required, Immediately after the completion of the primary cooling, it is possible to proceed to the quenching temperature maintaining step, and the lead time for the high-temperature carburizing process can be further shortened.
[0022]
In general, the temperature raising process, carburizing process, and quenching temperature holding process are processes that require several hours, while the quenching process is a process that is completed in a short time of about ten minutes or more. Compared to the occupation time, the occupation time of the article to be processed in the quenching unit is extremely short, and the operating efficiency of the quenching tank in the conventional batch furnace is very low. Therefore, as described above, the operation efficiency of the quenching unit can be increased by connecting a plurality of carburizing units to the transfer unit.
[0023]
Moreover, the occupation time of the article to be processed in each unit is usually carburizing unit> reheating unit> primary cooling unit> quenching unit> conveying unit, and a plurality of reheating units corresponding to a plurality of carburizing units are conveyed units. By connecting them to each other, it is possible to efficiently and flexibly handle a small amount of products to be processed.
[0024]
Further, in the present invention, it is possible to use the transfer unit as a charging chamber by providing a charging door capable of vacuum insulation for charging the processed product in the transfer unit having the least occupied time of the processed product. Efficiency can be further increased.
[0025]
    As described above, the product to be treated is acid.Turn intoWith the conveyance unit held to a certain extent, it is possible to provide a processing method and apparatus capable of flexibly responding to production fluctuations in carburizing and quenching processing of steel parts and enabling efficient production with little waste even with a small amount. In addition, it is possible to provide an apparatus that can flexibly cope with a tempering process such as a simple heat-quenching process and an annealing process.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0027]
  FIG. 1 is a carburizing and quenching apparatus according to an embodiment of the present invention. In the figure, 1 is a carburizing unit, 2 is a transport unit, 3 is a quenching unit, 4a and 4b are partition doors, and 5 is a charging door. , 6 is an extraction door. When the inside of the transport unit 2 is restored to atmospheric pressure and there is no product to be processed in the carburizing unit 1 and the transport unit 2, the product to be processed is transported (not shown) with the charging door 5 opened. The mechanism is loaded into the transport unit 2.As is apparent from FIG. 1, the units 1, 2, and 3 are arranged such that the carburizing unit 1 and the quenching unit 3 are arranged on the left and right, and the transport unit 3 is sandwiched between them. The extraction door 6 is disposed at a position facing the partition door 4b of the quenching unit. Therefore, the transfer of the workpieces between the units is performed on one straight line, and the removal of the workpieces from the quenching unit is also performed on the single straight line.
[0028]
When the article to be processed is transferred to a fixed position in the transport unit 2, the charging door 5 is closed, and the interior of the transport unit 2 is evacuated by a vacuum exhaust device (not shown). On the other hand, the inside of the carburizing unit 1 that has been held at a predetermined processing temperature in advance is held in advance by a vacuum exhaust device (not shown) under a reduced pressure that does not oxidize or decarburize the product to be processed. When the pressure in the carburizing unit 1 becomes substantially equal, the partition door 4a is opened, the article to be processed is transferred to a fixed position in the carburizing unit 1, and the partition door 4a is closed.
[0029]
    After that, the article to be treated is subjected to a predetermined temperature raising process, carburizing process, and quenching temperature maintaining process in the carburizing unit 1 in an atmosphere of about atmospheric pressure or under reduced pressure. When the quenching temperature maintaining step is completed, the inside of the carburizing unit 1, the transfer unit 2, and the quenching unit 3 are treated with acid.Turn intoExhaust pressure is reduced by a vacuum exhaust device (not shown) to a certain level, the partition door 4a is opened, the product to be processed is transferred from the carburizing unit 1 into the transport unit 2, the partition door 4a is closed, and the partition door 4b is opened. The article to be processed is transferred from the transfer unit 2 to a fixed position in the quenching unit 3 by a transfer mechanism (not shown), and the partition door 4b is closed. The article to be processed transferred into the quenching unit 3 is quenched under a predetermined condition.
[0030]
When the quenching process is completed, the inside of the quenching unit 3 is restored to atmospheric pressure and the product to be processed is extracted outside the apparatus, but oil is often used as a refrigerant during quenching, preventing contamination of the apparatus with oil. In order to do this, it is taken out from the extraction door 6 as shown in FIG. If there is no risk of contamination in the apparatus due to oil as a quenching medium, the product to be processed can be taken out via the loading door 5 via the inside of the transport unit 2, and in this case the extraction door 6 The necessity of having is eliminated.
[0031]
Here, when the product to be processed is transferred into the quenching unit 3 and the partition door 4b is closed, the inside of the transport unit 2 can be returned to the atmosphere, and the next product to be processed is immediately charged into the transport unit 2. Furthermore, it can be transferred to a fixed position in the carburizing unit 1 in the same manner as described above, and the processing in the carburizing process can be continued without waiting for the time until the article to be processed in the quenching process is taken out from the quenching unit 3. It is possible to increase the productivity.
[0032]
FIG. 2 is a carburizing and quenching apparatus according to an embodiment that can flexibly cope with various carburizing and quenching processes. In contrast to the embodiment shown in FIG. 1, a primary cooling unit 7 is newly provided via a partition door 4c. Is connected to the transport unit 2. In the same manner as in the embodiment shown in FIG. 1, the article to be processed is inserted into the transfer unit 2 through the charging door 5 and further transferred to a fixed position in the carburizing unit 1. The predetermined temperature raising step, carburizing step, and quenching temperature holding step are performed in an atmosphere of about atmospheric pressure or under reduced pressure.
[0033]
    In this carburizing process, in order to shorten the processing time, in the case of a high-temperature carburizing process performed by increasing the diffusion rate of carbon at a high temperature exceeding 1223 K, if the object to be processed is a normal case-hardened steel, the coarsening of the crystal grains is reduced. Occurs and requires the operation of crystal grain refinement. Therefore, when the process of the high-temperature carburizing book processing is completed in the carburizing unit 1, the product to be processed is oxidized in the carburizing unit 1, the transport unit 2, and the primary cooling unit 7.Turn intoWhen the exhaust pressure is reduced by a vacuum exhaust device (not shown) to a certain level and the pressure in each of the units 1, 2, 7 becomes substantially equal, the partition door 4 a opens, and the product to be processed is transferred from the carburizing unit 1 to the transport unit 2 The partition door 4a is closed and the partition door 4c is opened. The article to be processed is transported to a fixed position in the primary cooling unit 7 by a transport mechanism (not shown), and the partition door 4c is closed.
[0034]
Next, the article to be treated is cooled in the primary cooling unit 7 to a temperature not higher than the A1 transformation point in an inert gas atmosphere where the article to be treated is not oxidized or decarburized, for example, in a nitrogen atmosphere. After the predetermined primary cooling, the product to be processed passes through the transfer unit 2 through the partition door 4c and the inside of the carburizing unit 1 through the partition door 4a under reduced pressure at which the product to be processed is not oxidized or decarburized. Returning to the position, the partition door 4a is closed, and the product to be treated is reheated to the quenching temperature in an atmosphere (including under reduced pressure) in which oxidation or decarburization does not occur.
[0035]
When the predetermined quenching temperature holding step is completed, the processed product is transferred to a fixed position in the quenching unit 3 through the transport unit 2 and extracted after being quenched, as in the embodiment of FIG. It is taken out from the door 6. As described above, the carburizing and quenching apparatus shown in FIG. 2 can flexibly cope with various carburizing and quenching processes such as a high-temperature carburizing process while improving productivity.
[0036]
FIG. 3 is a carburizing and quenching apparatus according to an embodiment in which the productivity of the embodiment of the embodiment shown in FIG. 2 is further increased. The transfer unit 2 according to the embodiment shown in FIG. 2a is connected, and a partition door 4d and a charging door 5 are provided in the additional transport unit 2a, and a reheating unit 8 is connected to the partition door 4d.
[0037]
    In other words, the product to be processed is charged into the additional transfer unit 2a through the charging door 5, and then further passed through the transfer unit 2 to the acid by a transfer mechanism (not shown).Turn into2 is transferred under a reduced pressure, transferred to a fixed position in the carburizing unit 1, and subjected to a predetermined temperature raising step, carburizing step, and quenching temperature holding step, and then the predetermined primary cooling step in the primary cooling unit 7 is shown in FIG. It implements similarly to one Embodiment shown in (1).
[0038]
    And saidonceThe product to be processed after the predetermined primary cooling in the cooling unit 7 is processedTurn intoUnder reduced pressure, it is transferred to the fixed position in the reheating unit 8 through the partition door 4d through the partition unit 4c, through the transport unit 2 and the extension transport unit 2a, and the partition door 4d is closed. The treated product is reheated to the quenching temperature in an atmosphere (including under reduced pressure) in which it is not oxidized or decarburized.
[0039]
    The processed product that has undergone the predetermined quenching temperature maintaining process isTurn into1 is transferred to the quenching unit 3 via the partition door 4b and through the partition door 4b through the partition door 4d under the reduced pressure, and is quenched as in the embodiment of FIG. Then, it is taken out from the extraction door 6.
[0040]
On the other hand, when the product to be processed is transferred into the primary cooling unit 7, the inside of the transport unit 2 and the extension transport unit 2 a is restored to atmospheric pressure, and then the next product to be processed passes through the loading door 5. And is transferred into the carburizing unit 1 in the same manner as described above, and a temperature raising step, a carburizing step, and a quenching temperature holding step are performed. In this way, by dividing the process for each unit and reducing the time that each unit is occupied by the product to be processed, the productivity of the embodiment shown in FIG. 2 can be further enhanced.
[0041]
FIG. 4 shows a carburizing and quenching apparatus according to an embodiment in which the operating efficiency of the apparatus is increased. A new carburizing unit 1a is connected to the transport unit 2 according to the embodiment shown in FIG. 1 through a partition door 4e. (The carburizing unit 1a is connected to the transport unit 2 instead of the temporary cooling unit 7 shown in FIG. 2).
[0042]
As in the embodiment shown in FIG. 1, the product to be processed is inserted into the transfer unit 2 through the charging door 5, and then in the carburizing unit 1, a predetermined temperature raising process, carburizing process, quenching temperature. A holding process is performed, and then a quenching process is performed in the quenching unit 3. After the article to be treated is transferred into the carburizing unit 1 and the temperature raising process is started, a new next article to be treated is charged into the transfer unit 2 through the loading door 5 and passes through the inside of the transfer unit 2. Then, it is transferred into the newly provided carburizing unit 1a, and subsequently a predetermined temperature raising step, carburizing step, and quenching temperature holding step are performed.
[0043]
At this time, the quenching unit 3 is operated efficiently by adjusting the time in advance so that the articles to be processed in the two carburizing units 1 and 1a are not simultaneously transferred into the quenching unit 3. be able to. That is, by installing and configuring a plurality of carburizing units 1 and 1a with respect to one unit of quenching unit 3, the operating efficiency of quenching unit 3 can be increased and the ratio of equipment costs to production volume can be kept low. .
[0044]
FIG. 5 is a carburizing and quenching apparatus according to an embodiment in which the operating efficiency of the primary cooling unit 7, the reheating unit 8 and the quenching unit 3 is increased and the productivity is increased, and the additional transfer unit shown in FIG. 3. The carburizing unit 1b is newly connected to 2a via a partition door 4f. As in the case of the embodiment shown in FIG. 3, the product to be processed is inserted into the extension transport unit 2 a via the charging door 5, and the carburizing unit is passed through the extension transport unit 2 a and the transfer unit 2. 1 is transferred to a fixed position, a predetermined temperature raising step and a carburizing step are performed, and then a predetermined primary cooling step is performed in the primary cooling unit 7, and then a predetermined quenching temperature is maintained in the reheating unit 8. A process is performed and a quenching process is subsequently performed in the quenching unit 3.
[0045]
After the article to be treated is transferred to a fixed position in the carburizing unit 1 and the temperature raising process is started, a new next article to be treated is charged into the additional transfer unit 2a through the loading door 5 as described above. Then, it is transferred to a fixed position in the other carburizing unit 1b through the extension transfer unit 2a and the partition door 4f, and a predetermined temperature raising process and carburizing process are performed. In the temperature holding process and the quenching process, the primary cooling unit 7, the reheating unit 8 and the quenching unit 3 are made efficient by adjusting the time in advance so that the two processed products do not proceed to the same process at the same time. Can operate well.
[0046]
As shown in FIG. 5, the primary cooling unit 7, the refrigerating unit 8, and the quenching unit 3 are each configured as an apparatus in which a plurality of units of the carburizing units 1 and 1 a are installed. The operating efficiency of the reheating unit 8 and the quenching unit 3 can be increased, the ratio of the equipment cost to the production amount can be kept low, and the productivity can be increased.
[0047]
FIG. 6 is a carburizing and quenching apparatus according to an embodiment in which the operating efficiency of the primary cooling unit 7 and the quenching unit 3 and the productivity of the apparatus are further increased, and the additional transfer unit 2a according to the embodiment shown in FIG. Further, the additional transport unit 2b is connected, and the additional transport unit 2b is provided with two partition doors 4g and 4h, and a new carburizing unit 1c is connected via the partition door 4g, and the partition door 4h. It is the structure which connected the new reheating unit 8a via.
[0048]
The article to be processed is processed through the respective steps in the same manner as described with reference to FIG. Usually, in the carburizing and quenching process, as described above, the occupation time of each product in each unit is carburizing unit> reheating unit> primary cooling unit> quenching unit> conveying unit. By connecting a plurality of matching reheating units to the transport unit, the adjustment time for charging the article to be processed can be made much shorter than that of the embodiment shown in FIG. The product can be processed efficiently and flexibly.
[0049]
That is, a plurality of carburizing units 1, 1 b, 1 c and reheating units 8, 8 a are installed for each primary cooling unit 7 and quenching unit 3, and the number of carburizing units 1> reheating units By configuring the apparatus with the number of units, a carburizing and quenching apparatus with high operating efficiency and high productivity can be obtained.
[0050]
In the above description, the temperature raising step is performed in the carburizing unit. However, a unit dedicated to the temperature raising step can be connected separately, or the reheating unit is used for the temperature raising step. It is possible to use a variety of methods.
[0051]
【Effect of the invention】
As described above, the carburizing and quenching method and apparatus according to the present invention subdivides the carburizing and quenching process, processes the subdivided process with a dedicated unit, and further, vacuum-insulates the workpieces with each unit. In the carburizing and quenching treatment of steel parts, it is possible to flexibly cope with production fluctuations, and even a small amount is wasted. Less efficient production is possible, and at the same time, a beneficial effect is obtained for improving productivity. In addition, since each process is unitized, a lean apparatus configuration suitable for the production situation is possible.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a carburizing and quenching apparatus of the present invention.
FIG. 2 is a plan layout view showing another embodiment of the carburizing and quenching apparatus of the present invention.
FIG. 3 is a plan layout view showing still another embodiment of the carburizing and quenching apparatus of the present invention.
FIG. 4 is a plan layout view showing still another embodiment of the carburizing and quenching apparatus of the present invention.
FIG. 5 is a plan layout view showing still another embodiment of the carburizing and quenching apparatus of the present invention.
FIG. 6 is a plan layout view showing still another embodiment of the carburizing and quenching apparatus of the present invention.
[Explanation of symbols]
1 Carburizing unit
1a-1c Carburizing unit
2 Transport unit
2a, 2b Expansion transfer unit
3 Quenching unit
4a ~ 4h Partition door
5 loading door
6 Extraction door
7 Primary cooling unit
8,8a Reheating unit

Claims (7)

The steel part in the carburizing quenching process to a workpiece, wherein the workpieces, that is provided through the partition door for vacuum isolation between the placement perilla a carburizing unit and quenching unit to the left and right conveyance unit The transport unit is held under a reduced pressure that does not oxidize the product to be processed, and the supply of the product to be processed to the transport unit is arranged either before or after the transport unit. It is performed by opening a charging door capable of vacuum insulation, the article to be processed is transferred from the transport unit to the carburizing unit, and the carburizing diffusion process in the carburizing unit, or the article to be processed after the diffusion process, through the transport unit and transferred to the quenching unit, said quenching step is carried out after closing the partition door is disposed at a position facing said partition door in the quenching unit Open the extraction door, characterized in that retrieving the workpieces from the quenching unit, carburizing and quenching method. Before SL carburization diffusion process in carburizing unit the treated article or diffusion process is completed, then the primary cooling, reheating, practicing the steps of quenching, the conveying the transfer of workpieces between each step The carburizing and quenching method according to claim 1, wherein the carburizing and quenching method is performed through a unit. In a carburizing and quenching processing apparatus that uses steel parts as processed products, a carburizing unit that performs a carburizing diffusion process of the processed products and a quenching unit that performs a quenching process of the processed products that have completed the carburizing diffusion process are arranged on the left and right. the arranged so as to be sandwiched between the carburizing units transport unit was vacuum enclosure for transferring the workpieces between the quenching unit, between the carburizing unit to the conveying unit and the hardening unit A partition door for vacuum insulation is provided between the transfer unit and a transfer door capable of vacuum insulation for charging a workpiece to be processed before or after the transfer unit. A carburizing and quenching apparatus, characterized in that an extraction door for taking out a processed product is provided at a position facing the partition door . The carburizing and quenching apparatus according to claim 3 , wherein a plurality of carburizing units are connected to the transport unit via partitioning doors. Comprising a primary cooling unit for primary cooling step of cooling the said exit charcoal diffusion step immersion in carburizing unit workpieces to A1 transformation temperature or less, the said primary cooling unit via the partition door for vacuum insulation The carburizing and quenching apparatus according to claim 3 or 4, connected to the transport unit . A reheating unit for performing a reheating step for heating and holding the article to be processed that has finished the primary cooling step in the primary cooling unit to a quenching temperature , and the reheating unit is a partition for vacuum insulation; The carburizing and quenching apparatus according to claim 5, wherein the carburizing and quenching apparatus is connected to the transfer unit via a door. The carburizing and quenching apparatus according to claim 6, wherein a plurality of reheating units are connected to the transfer unit via partition doors.

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