JP6178596B2 - Plug quenching device - Google Patents

Description

  The present invention relates to a plug quenching apparatus for quenching an annular workpiece.

  Generally, quenching is performed to increase the hardness of automobile parts, machine parts, and the like. There are various quenching apparatuses that perform the quenching process. For example, when quenching an annular machine part such as a gear part (hereinafter referred to as “object to be processed”), a plug quenching apparatus is used. There is a case.

  The plug quenching apparatus is an apparatus for the purpose of preventing a dimensional change of an object to be treated in a quenching process. The quenching process by the plug quenching apparatus is performed in a state where a cylindrical cored bar is inserted inside the object to be processed and the inner diameter of the object to be processed is constrained.

  Examples of conventional plug hardening devices include those disclosed in Patent Document 1 and Patent Document 2, for example. As shown in FIG. 7 of Patent Literature 1, the plug quenching device of Patent Literature 1 is a core metal plug on the inner peripheral surface of a work 3 stopped on a core metal abutment 6 in a cooling station 2 (quenching device). 7 is inserted, and then the cooling chamber 8 is lowered from above, and a coolant is ejected to rapidly cool the work 3 (see paragraphs [0004] and [0005] of Patent Document 1). ). This is a structure according to the above-described conventional plug hardening apparatus.

  The plug quenching device disclosed in Patent Document 2 has a structure in which after the annular workpiece W is fixed by the core metal 2, the upper portion of the annular workpiece W is pressed by the presser mechanism 5 and then the annular workpiece W is induction-heated and cooled. .

JP 08-239714 A Japanese Patent Laid-Open No. 10-25519

  However, in the plug quenching apparatus of Patent Document 1, when the coolant is ejected after the cooling chamber 8 is lowered, the coolant may leak from between the lower end surface of the cooling chamber 8 and the upper surface of the base 9. This phenomenon is particularly likely to occur when a liquid such as quenching oil is used as the coolant.

  In such a case, the periphery of the plug quenching device is contaminated with the quenching oil and its mist, and the operator may fall over the oil that has adhered to the floor. For this reason, from the viewpoint of safety and hygiene, there is a demand for means for preventing the leakage and scattering of the quenching oil.

  Similarly, in Patent Document 2, the quenching oil may leak from between the workpiece W and the presser mechanism 5, and when the presser mechanism 5 is lifted and removed from the workpiece W, the quenching oil may drop and scatter. is there. Further, the quenching quality may not be stabilized due to the stress from the presser mechanism 5 and the heat conduction to the presser mechanism 5.

  An object of the present invention is to provide a plug quenching device that can prevent the quenching oil from flowing out to the periphery of the equipment in order to solve the above-described problems.

According to the present invention, there is provided a plug quenching apparatus for quenching the object to be processed in a state where the inner diameter of the annular object to be processed is constrained by a cored bar,
A quenching unit that accommodates the object to be processed is provided, and the quenching unit is provided inside a unit container having a first opening, and a second opening that accommodates the object to be processed. A unit cover that covers the first opening and the second opening, and seals the unit container and the quenching container, and is provided with quenching oil in the quenching container. A plug quenching device is provided, which is configured to quench the workpiece .

  It is preferable that a quenching oil supply pipe for supplying quenching oil into the quenching container is provided outside the quenching container and inside the unit container. Further, the quenching oil supply pipe may be constituted by a plurality of supply pipes, and at least one connecting portion of each supply pipe may be provided outside the quenching container and inside the unit container. .

  In addition, a discharge pipe for discharging the quenching oil accumulated in the unit container may be provided outside the quenching container and inside the unit container. Moreover, an oil drop fall prevention means may be provided between the quenching unit and the unit cover. The quenching unit may be configured to be exchangeable with another quenching unit.

  Further, according to the present invention, there is provided a plug quenching apparatus including a quenching chamber for quenching the object to be processed in a state in which an inner diameter of the annular object to be processed is constrained by a cored bar. When quenching the processing body, the processing object is accommodated and a quenching space filled with quenching oil, and a sealed space formed so as to surround the quenching space and not communicating with the quenching space. Also provided is a plug quenching device.

  It is preferable that a quenching oil supply pipe for supplying quenching oil to the quenching space is provided in the sealed space. Moreover, the said quenching oil supply pipe | tube may be comprised with a some supply pipe | tube, and the at least 1 connection part of each supply pipe | tube may be provided in the said sealed space.

  According to the present invention, the quenching chamber leaks from the quenching space by having a quenching space for quenching the object to be processed and a sealed space that does not communicate with the quenching space formed so as to surround the quenching space. The hardened oil will accumulate in the sealed space. Thereby, the outflow of the quenching oil to the outside of the quenching chamber can be prevented. As a result, the periphery of the quenching apparatus can be kept clean.

It is a schematic plan view which shows the carburizing processing equipment which concerns on embodiment of this invention. It is the figure seen from the A direction in FIG. It is a top view of the hardening unit which concerns on embodiment of this invention. It is a BB cross section view in FIG. It is a figure (right view of FIG. 1) which shows the hardening apparatus which concerns on embodiment of this invention. It is a figure which shows each process of the hardening process in the BB cross section view in FIG. However, the left half of the quenching unit is not shown. It is a figure which shows operation | movement of the hardening apparatus which concerns on embodiment of this invention. It is a figure which shows operation | movement of the hardening apparatus which concerns on embodiment of this invention. It is a figure which shows operation | movement of the hardening apparatus which concerns on embodiment of this invention. It is a figure which shows operation | movement of the hardening apparatus which concerns on embodiment of this invention. It is a figure which shows operation | movement of the hardening apparatus which concerns on embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described based on the carburizing treatment facility 1. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 1, the carburizing treatment facility 1 includes a material supply unit 10, a measurement unit 20, a carburizing furnace 30, and a plug quenching device 100. Further, as equipment (not shown), a cleaning machine, a tempering furnace, and the like for cleaning the object to be processed may be provided after the plug quenching process is performed. Between each component part, a conveyance path etc. are provided and the cyclic | annular workpiece W is conveyed toward the arrow direction in FIG. The annular workpiece W is, for example, a gear of a machine part.

  The measuring unit 20 is provided with a measuring device (not shown) that measures the inner diameter, outer diameter, and thickness of the annular workpiece W. A carry-in table 2 and a carry-out table 3 are provided on the entry side and the exit side of the carburizing furnace 30, respectively, and the workpiece W placed on the carry-in table 2 is carried into the carburizing furnace. An L-shaped transport path 4 is provided between the measurement unit 20 and the carry-in table 2, and a pusher 5 is provided on the side of the transport path 4. In addition, the drive mechanism of the pusher 5 is an air cylinder or an electric cylinder, for example.

  Between the carry-out stand 3 of the carburizing furnace 30 and the plug quenching apparatus 100, there is provided a transport path 6 for transporting the workpiece W to a subsequent cleaning machine after quenching. Near the upstream end of the transport path 6, a transport device 7 for transporting the workpiece W to the plug quenching device 100 is provided. As shown in FIG. 2, the transfer device 7 is provided with an articulated transfer arm 8, and the tip of the transfer arm 8 has a shape capable of holding the workpiece W (for example, a four-claw shape). Part 9 is provided. The grip 9 is configured to be able to measure the outer diameter of the object to be processed when the object W is gripped.

  As shown in FIGS. 1 and 2, the plug quenching apparatus 100 includes a plurality of quenching units 110, a unit storage shelf 130 (stock section), a unit transport apparatus 140, a quenching station 150 (quenching section), and a preheating station 151 (preheating section). The unit cover 160 and the quenching oil tank 180 are provided. The quenching station 150 and the preheating station 151 have a space in which the quenching units 110 can be accommodated one by one.

  As shown in FIG. 1 to FIG. 3, the quenching unit 110 has a rectangular parallelepiped box-shaped unit container 111 with a flange formed on the upper end surface, and has an opening 122 (first opening) at the top. ing. Inside the unit container 111, two cylindrical containers 112 having an opening 123 (second opening) at the top are provided along the longitudinal direction of the unit container 111. As shown in FIG. 4, the cylindrical container 112 is divided into an upper cylindrical container 113 (quenched container) and a lower cylindrical container 114 with the bottom surface of the unit container 111 as a boundary. Further, as shown in FIG. 5, a rectangular parallelepiped flat plate 115 is provided at the lower part of the lower cylindrical container 114 of the quenching unit 110. The flat plate 115 is shaped so that the two lower cylindrical containers 114 penetrate the flat plate 115. Note that FIG. 4 does not show a cover lifting cylinder 154 described later.

  As shown in FIG. 4, a cored bar 116 corresponding to the inner diameter of the workpiece W is stored in the lower cylindrical container 114. At the center of the bottom surface of the lower cylindrical container 114, a hole (not shown) through which a metal core elevating cylinder 152 provided below the quenching station 150 can pass is provided. Is connected to the lower end of the.

  At the center of the bottom surface of the upper cylindrical container 113, a hole (not shown) through which the rising and lowering core 116 can pass is provided. As shown in FIG. 4, the core metal lifting cylinder 152 is moved up and down to insert the core metal 116 inside the object to be processed W, whereby the inner diameter (inner circumference) of the object W placed in the upper cylindrical container 113. Part). The metal core 116 is formed with a plurality of holes (not shown) through which quenching oil can pass. The metal core elevating cylinder 152 is, for example, a hydraulic cylinder.

  Further, as shown in FIG. 4, the first supply / discharge for supplying and discharging the quenching oil into the quenching unit 110 outside the upper cylindrical container 113 of the quenching unit 110 and inside the unit container 111. A tube 117 is provided. The first supply / discharge pipe 117 is provided so as to penetrate the bottom surface of the unit container 111 and penetrate the side surface of the lower cylindrical container 114. A connecting pipe 118 that connects the two lower cylindrical containers 114 of the quenching unit 110 is provided on the side surface of the lower cylindrical container 114 of the quenching unit 110.

  As shown in FIGS. 3 and 4, a drain 124 for discharging the quenching oil accumulated in the unit container is provided outside the upper cylindrical container 113 and inside the unit container 111. The drain 124 is provided so as to penetrate the bottom surface of the unit container 111, one end of the opening of the drain 124 is provided on the bottom surface of the unit container 111, and the other end is exposed to the outside of the unit container 111. . Further, the drain 124 is provided with a drain valve 125 for adjusting the discharge amount of the quenching oil accumulated in the unit container.

  As shown in FIG. 5, the unit storage shelf 130 has a multistage configuration that can store a plurality of quenching units 110. In addition, the core metal 116 provided in each hardening unit 110 has a mutually different outer diameter. That is, as many quenching units 110 as the number of types of workpieces W having different inner diameters for which quenching processing is scheduled are provided.

  The unit storage shelf 130 is provided with a support base 131 that supports the quenching unit 110 accommodated in the first stage. The upper surface of the support base 131 extends along both longitudinal ends of the flat plate 115 of the quenching unit 110. A support convex portion 132 is formed. Two support convex portions 132 are formed for one quenching unit 110, and the flat plate 115 of the quenching unit 110 is supported by these support convex portions 132. Note that FIG. 5 does not show a unit transport device 140 described later.

  As shown in FIGS. 1 and 5, a support beam 134 is provided above the rear plate 133 of the unit storage shelf 130 so as to protrude forward from the rear plate 133. The support beams 134 are formed along both longitudinal ends of the flat plate 115 of the quenching unit 110. Two support beams 134 are formed for one quenching unit 110, and the flat plate 115 of the quenching unit 110 is supported by these support beams 134. The unit storage shelf 130 has a width that can store five quenching units 110 in one stage.

  In addition, as shown in FIG. 1, a space in which the unit replacement carriage 135 can move is provided behind the unit storage shelf 130. The rear plate 133 of the unit storage shelf 130 has such a shape that the quenching unit 110 stored in the first stage of the unit storage shelf 130 can be carried in and out by the unit replacement cart 135 from the rear of the unit storage shelf 130. Yes. Thereby, even if the carburizing processing facility 1 is in operation, the quenching unit 110 can be maintained or replaced with a new quenching unit 110 without stopping the processing line.

  As shown in FIG. 1, the unit conveyance device 140 includes a unit conveyance path 141 and a unit conveyance carriage 142. The unit transport carriage 142 is configured to be movable along the unit transport path 141, and the unit transport carriage 142 has a fork portion 143 that supports the flat plate 115 of the quenching unit 110. The fork portion 143 is configured to be movable up and down, and is configured to be extendable and retractable so as to be inserted between the outer surface of the lower cylindrical container 114 and the two support convex portions 132 or the support beams 134. Yes. Further, the unit transport carriage 142 has a space for accommodating the quenching unit 110 to be transported.

  As shown in FIG. 5, the quenching station 150 and the preheating station 151 are provided with a mounting table 153 on which the quenching unit 110 is mounted. The quenching unit 110 transported to the quenching station 150 and the preheating station 151 is accommodated in the quenching station 150 and the preheating station 151 by bringing the upper surface of the mounting table 153 into contact with the lower surface of the flat plate 115.

  As shown in FIGS. 2 and 5, a unit cover 160 that covers the upper opening of the quenching unit 110 when performing a quenching process is provided at the top of the quenching station 150. The unit cover 160 has a rectangular parallelepiped box-shaped cover container 161 having a flange formed on the lower end surface. Inside the cover container 161, two cover cylindrical containers 162 opened at the bottom are covered by the cover container 161. It is formed along the longitudinal direction.

  Further, a cover elevating cylinder 154 for elevating and lowering the unit cover 160 is provided above the quenching station 150 and the preheating station 151, and the cover elevating cylinder 154 is connected to the upper end surface of the unit cover 160. By lowering the unit cover 160 with the cover lifting cylinder 154, the flanges formed on the unit container 111 and the cover container 161 are brought into close contact with each other. Thereby, a quenching chamber QR for quenching the workpiece W is formed (FIG. 6B). In FIG. 6, the cover lifting cylinder 154 is not shown.

  At this time, the openings 123 (second openings) of the two upper cylindrical containers 113 (quenched containers) of the quenching unit 110 are covered and sealed with the two cover cylindrical containers 162 of the unit cover 160. As a result, a quenching space QS (FIG. 6B) filled with quenching oil for quenching the workpiece W is formed. A seal member (not shown) such as an O-ring is provided between the cover cylindrical container 162 and the upper cylindrical container 113.

  Similarly, the opening 122 (first opening) of the unit container 111 of the quenching unit 110 is covered with the cover container 161 of the unit cover 160, thereby enclosing the quenching space QS (FIG. 6). (B)) is formed.

  As shown in FIG. 4, a second supply / discharge pipe 163 for supplying and discharging quenching oil is provided in the unit cover 160 outside the cover cylindrical container 162 and inside the cover container 161. Yes. The second supply / discharge pipe 163 is provided so as to penetrate the upper surface of the cover container 161. The first supply / discharge pipe 117 and the second supply / discharge pipe 163 described above can be connected at the connecting portion 164 when the quenching unit 110 is covered with the unit cover 160.

  Further, as shown in FIG. 4, a quenching oil discharge pipe 165 for discharging the quenching oil filled in the quenching space is provided on the peripheral edge of the upper surface of the cover cylindrical container 162. The quenching oil discharge pipe 165 and the second supply / discharge pipe 163 are connected to the quenching oil tank 180 (FIG. 1) and can circulate the quenching oil used for the quenching process (preheating process in the preheating station 151). It has a structure. The quenching oil tank 180 has a temperature adjusting mechanism (not shown), and the temperature of the supplied quenching oil is adjusted to be a constant temperature. In addition, the temperature of the quenching oil supplied is about 50 degreeC, for example.

  A unit cover 160 similar to the unit cover 160 provided in the quenching station 150 is also provided in the upper part of the pre-heat treatment station. A preheating chamber PHR is formed by covering the quenching unit 110 of the preheating station 151 with a unit cover 160. In addition, the cover raising / lowering cylinder 154 and the cored bar raising / lowering cylinder 152 provided in the quenching station 150 and the preheating station 151 are configured to be able to operate independently.

  Further, as shown in FIG. 6 (f), the quenching apparatus is provided with an oil pan 181 that can move horizontally between the quenching unit 110 and the unit cover 160. The oil pan 181 is connected to, for example, a hydraulic cylinder 182 or the like. The oil pan 181 also has a configuration that can be raised and lowered. Note that the oil pan 181 is not shown in the drawings other than FIG.

  Next, the carburizing and quenching processing method of the carburizing equipment 1 configured as described above will be described.

  As shown in FIG. 1, first, the workpiece W is supplied from the material supply unit 10. Thereafter, the supplied workpieces W pass through the measuring unit 20 one by one, and the inner diameter, outer diameter, and thickness are measured by a measuring device (not shown) provided in the measuring unit 20. At this time, the measured measurement information of the workpiece W is transmitted to the plug quenching device 100 via a control device (not shown).

  Thereafter, the workpiece W that has passed through the measuring unit 20 is pushed out by the pusher 5 provided on the side of the conveyance path 4 and moved to the loading table 2 of the carburizing furnace 30. When the two workpieces W are placed on the carry-in table, the two workpieces W are carried into the carburizing furnace and carburized in the carburizing furnace. Then, the two workpieces W are unloaded from the carburizing furnace and reach the unloading table 3.

  Next, the workpiece W on the carry-out table is held by the articulated transfer arm 8 and placed at a predetermined position in the upper cylindrical container 113 of the quenching unit 110 set in the quenching station 150 (FIG. 6). (A)). At this time, the quenching unit 110 set in the quenching station 150 is prepared based on the measurement information of the workpiece W measured by the measurement unit 20. That is, a quenching unit 110 including a cored bar 116 corresponding to the inner diameter of the workpiece W is prepared.

  Thereafter, as shown in FIGS. 5 and 6B, the unit cover 160 is lowered by the cover lifting cylinder 154, and the upper surface of the quenching unit 110 and the lower surface of the unit cover 160 are brought into close contact with each other. Thus, a quenching chamber QR (a preheating chamber PHR in the preheating station 151) is formed. At this time, the first supply / discharge pipe 117 provided in the quenching unit 110 and the second supply / discharge pipe 163 provided in the unit cover 160 are also connected. Subsequently, the metal core 116 is raised by the metal core elevating cylinder 152 and inserted into the object to be processed W, and the inner diameter (inner peripheral part) of the object to be processed W is constrained.

  Next, as shown in FIG. 6C, the quenching oil is supplied from the quenching oil tank 180 (FIG. 1) to the second supply / discharge pipe 163, and is supplied to the lower cylindrical container 114 through the first supply / discharge pipe 117. Quenching oil is injected. Thereafter, the quenching oil filled in the lower cylindrical container 114 flows into the upper cylindrical container 113 through holes (not shown) formed on the bottom surface of the core metal 116 and the upper cylindrical container 113. Then, as shown in FIG. 6D, the quenching oil is filled into the quenching space QS formed by the close contact between the cover cylindrical container 162 and the upper cylindrical container 113 of the quenching unit 110.

  Even after the quenching space QS is filled with the quenching oil, the quenching oil is continuously supplied from the second supply / discharge pipe 163, and at the same time, from the quenching oil discharge pipe 165 provided on the upper surface of the cover cylindrical container 162, the quenching space QS Quenching oil is discharged. Thus, the quenching process of the to-be-processed object W is performed by supplying the new quenching oil one after another and discharging the oil heated by cooling the to-be-processed object W.

  At this time, a seal member (not shown) such as an O-ring is provided between the upper cylindrical container 113 and the cover cylindrical container 162 of the quenching unit 110 forming the quenching space QS, so that the quenching oil does not leak. It has become. However, even if the quenching oil flows out of the gap between the upper cylindrical container 113 and the cover cylindrical container 162 due to some trouble, the quenching oil flowing out of the quenching space QS is not removed from the upper cylindrical container 113 of the quenching unit 110. And inside the unit container 111 (space). That is, the quenching oil that has flowed out of the quenching space QS does not flow out of the quenching chamber QR formed by the unit container 111 and the cover container 161.

  Further, the quenching oil discharged from the quenching oil discharge pipe 165 is returned to the quenching oil tank 180. The quenching oil is temperature-adjusted to, for example, about 50 ° C. in the quenching oil tank 180 and then supplied again from the second supply / discharge pipe 163.

  After completion of the quenching process, the supply of quenching oil from the quenching oil tank 180 is stopped. Thereafter, as shown in FIG. 6 (e), a pump (not shown) is operated, and the quenching oil is discharged from the second supply / discharge pipe 163 through the first supply / discharge pipe 117.

  Subsequently, as shown in FIG. 6F, the unit cover 160 is raised by the cover lifting cylinder 154 (FIG. 2). At this time, the oil pan 181 is inserted between the unit cover 160 and the quenching unit 110. In this state, the unit cover 160 and the oil pan 181 are raised, and waits above the quenching station 150 until the next quenching process is performed. By providing such an oil pan 181, quenching oil dripping from the inner surface of the cover cylindrical container 162 and quenching oil dripping from the connecting portion 164 of the first supply / discharge pipe 117 and the second supply / discharge pipe 163, It is possible to avoid scattering around the quenching unit and the quenching unit 110.

  In addition, when the unit cover 160 is raised and before the oil pan 181 is inserted between the unit cover 160 and the quenching unit 110, the lower end surface of the cover cylindrical container 162 or the first supply / discharge A drop of quenching oil falls from the connecting portion 164 between the pipe 117 and the second supply / discharge pipe 163. The oil droplets falling at this time are accumulated outside the upper cylindrical container 113 of the quenching unit 110 and inside the unit container 111. That is, the quenching oil does not flow out of the quenching chamber QR formed by the unit container 111 and the cover container 161.

  Thereafter, the cored bar raising / lowering cylinder 152 is lowered, and the cored bar 116 is pulled down from the workpiece W. At this time, the cored bar 116 that constrains the inner diameter of the object to be processed W and the object to be processed W that has been quenched are oil-cooled of the object to be processed W at a high temperature (for example, 900 ° C.) after the carburizing process. Therefore, it is in a shrink-fit state. For this reason, unless the optimum cored bar 116 is used according to the inner diameter of the workpiece W to be quenched, the cored bar 116 cannot be removed after the quenching process is completed, and the carburizing line may have to be stopped. .

  However, in the embodiment of the present invention, the workpiece W is gripped by the transport arm 8 when the dimension of the workpiece W is measured by the measuring unit 20 and the workpiece W after the carburizing process is transported. Thus, the dimension of the workpiece W is measured. The quenching unit 110 is prepared with a corresponding cored bar 116 based on the dimensional information measured by the measuring unit 20. At this time, the dimensions such as the outer diameter and inner diameter measured by the transfer arm 8 are measured. In the case where the outer diameter and the inner diameter measured by the unit 20 are significantly different, they are collected without being conveyed to the quenching unit 110. Thereby, the to-be-processed object W conveyed to the hardening station 150 can always be hardened with the hardening unit 110 provided with the optimal core metal 116. As a result, it is possible to avoid a situation in which the core bar 116 cannot be pulled out after the quenching process and the carburizing process line is stopped, and productivity can be improved.

  Next, the workpiece W in the upper cylindrical container 113 of the quenching unit 110 from which the core metal 116 has been removed is held by the articulated transfer arm 8 and placed on a predetermined position of the transfer path 6 as shown in FIG. For example, it is conveyed to a washing machine. After quenching oil is removed by the washing machine, it is transported to a tempering furnace and subjected to tempering treatment. Thereafter, the workpiece W is carried out of the furnace from the tempering furnace.

  As described above, a series of carburizing and quenching processing of the workpiece W is completed. When the workpieces W having the same inner diameter are continuously quenched, the above steps may be repeated. Further, the quenching oil accumulated inside the unit container 111 by repeatedly performing the quenching process is discharged and processed by opening the drain valve 125.

  Here, the operation of the plug quenching apparatus 100 when the inner diameter of the workpiece W2 to be processed next is different from the inner diameter of the workpiece W1 processed immediately before will be described.

  When the inner diameter of the object to be processed W2 measured by the measurement unit 20 is different from the inner diameter of the object to be processed W1, the quenching for the object to be processed W2 including the core metal 116 that is optimal with respect to the inner diameter of the object to be processed W2 is performed. The unit 120 is set in the preheating station 151. Then, as shown in FIG. 7, the unit cover 160 of the preheating station 151 is lowered, and the unit cover 160 and the quenching unit 120 form a preheating chamber PHR.

  In the preheating chamber PHR, the quenching oil is circulated as described in the quenching process. Thereby, in the unit accommodation shelf 130, the quenching unit 120 that is in a normal temperature state is heated to a temperature suitable for quenching (for example, 50 ° C.). As a result, in the quenching process performed later, the quenching oil supplied at a temperature suitable for the quenching process is not cooled by the quenching unit 120 in the room temperature state. That is, from the beginning of the quenching process, the workpiece W2 can be oil-cooled with quenching oil having a temperature suitable for the quenching process, and a uniform quenching process with no variation between products can be performed.

  Next, after completion of the quenching process of the workpiece W1, the quenching unit 119 for the workpiece W1 is unloaded from the quenching station 150 by the unit transport carriage 142 as shown in FIG. Thereafter, as shown in FIG. 9, the quenching unit 119 is accommodated in the unit accommodation shelf 130.

  Subsequently, as shown in FIG. 10, the quenching unit 120 for the workpiece W <b> 2 in the preheating station 151 is conveyed to the quenching station 150. Then, the quenching unit 120 waits at the quenching station 150 until the workpiece W2 is conveyed. Further, at this time, as shown in FIG. 11, the quenching unit 121 for the workpiece W3 is transferred to the preheating station 151 in preparation for the quenching process of the next workpiece W3 having an inner diameter different from that of the workpiece W2. .

  As described above, according to the embodiment of the present invention, the quenching space QR in which the workpiece W is quenched, and the sealed space CS that does not communicate with the quenching space QS formed so as to surround the quenching space QS. The quenching oil leaked from the quenching space QS can be stored in the sealed space CS. Thereby, the outflow of the quenching oil to the outside of the quenching chamber QR can be prevented. As a result, the periphery of the quenching apparatus can be kept clean.

  In addition, by providing a quenching oil supply pipe for supplying quenching oil to the quenching space QS in the sealed space CS, even if the quenching oil leaks from the quenching oil supply pipe, the quenching oil is stored in the sealed space CS. It will be accumulated in. Thereby, the outflow of the quenching oil to the outside of the quenching chamber QR can be prevented.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  For example, in the description of the above embodiment, two upper cylindrical containers are provided inside the unit container of the quenching unit, but the number of upper cylindrical containers is not limited to this. One or three or more upper cylindrical containers may be provided depending on the number of workpieces to be simultaneously quenched. Moreover, the container which forms hardening space is not limited to a cylindrical shape, What is necessary is just a shape which can accommodate a to-be-processed object. Similarly, the lower cylindrical container in which the metal core is accommodated is not limited to the cylindrical shape, and the number thereof is appropriately changed according to the number of objects to be processed. That is, when performing the quenching process, by providing a quenching space filled with quenching oil inside the quenching chamber and another sealed space formed so as to surround the quenching space, the quenching chamber has a double structure. These belong to the technical scope of the present invention.

  In addition, the shape of the quenching unit and the shape of the unit cover are appropriately changed according to the number of objects to be subjected to quenching processing at the same time. Further, the number of quenching stations and preheating stations can be appropriately changed according to the production amount, the space around the apparatus, and the like. Further, the multistage configuration, the number of units, and the storage mode of the unit storage shelves are appropriately changed depending on the type of the object to be quenched.

  Further, in the description of the above-described embodiment, the number of quenching units provided is the same as the number of types of workpieces having different inner diameters for which quenching is scheduled, but the number of quenching units may be larger than the number of types of workpieces. good. In the description of the above embodiment, the plug quenching apparatus is used for carburizing and quenching equipment, but the present invention is not limited to this.

  In the description of the above embodiment, the upper part of the quenching unit has an opening shape, and the quenching chamber is formed by covering the opening in the quenching part. However, the position of the opening is limited to the upper part of the quenching unit. I can't. Moreover, the hardening unit does not need to be opened. That is, even if the unit cover is not provided, it is only necessary that the quenching unit can accommodate the object to be processed in the quenching portion and can form a quenching chamber. Even in this case, if a quenching space and another sealed space formed so as to surround the quenching space are provided, the same effects as those of the above embodiment can be obtained.

  The present invention can be applied to a plug quenching apparatus that quenches a plurality of annular workpieces having different inner diameters.

DESCRIPTION OF SYMBOLS 1 Carburizing processing equipment 10 Material supply part 20 Measuring part 30 Carburizing furnace
100 Plug quenching apparatus 110 Quenching unit 111 Unit container 112 Cylindrical container 113 Upper cylindrical container (quenching container)
114 Lower cylindrical container 115 Flat plate 116 Core metal 117 First supply / discharge pipe 118 Connection pipe 119 Quenching unit for object W1 120 Quenching unit for object W2 121 Quenching unit 122 for object W3 Opening (first portion Aperture)
123 opening (second opening)
124 Drain (discharge pipe)
125 Drain valve 130 Unit accommodation shelf 131 Unit support stand 132 Support convex part 133 Back plate 134 of unit accommodation shelf Unit support beam 135 Unit exchange carriage 140 Unit conveyance device 141 Unit conveyance path 142 Unit conveyance carriage 143 Fork part 150 Quenching station 151 Preheating Station 152 Core metal lifting cylinder 153 Unit mounting table 154 Cover lifting cylinder 160 Unit cover 161 Cover container 162 Cover cylindrical container 163 Second supply / discharge pipe 164 Connecting portion 165 Hardened oil discharge pipe 180 Hardened oil tank 181 Oil pan (oil drop dropping) Prevention measures)
182 Hydraulic cylinder

200 Conventional Plug Hardening Device 210 Core Bar Container 211 Core Bar 212 Mounting Base 213 Hardening Oil Supply Pipe 214 Hardening Oil Discharge Pipe 220 Core Bar Lifting Cylinder 230 Unit Cover 231 Discharge Pipe

W Annular object QR Quenching chamber PHR Preheating chamber QS Quenching space CS Sealed space OIL Quenching oil

Claims (9)

A plug quenching device for quenching the object to be processed in a state where the inner diameter of the annular object to be processed is constrained by a cored bar,
A quenching unit in which the object to be treated is accommodated;
The quenching unit is
A unit container having a first opening;
A quenching container provided inside the unit container and having a second opening in which the object to be processed is accommodated;
A unit cover that covers the first opening and the second opening and seals the unit container and the quenching container ;
A plug quenching apparatus configured to quench the object to be treated with quenching oil in the quenching container .   The plug according to claim 1, wherein a quenching oil supply pipe for supplying quenching oil into the quenching container is provided outside the quenching container and inside the unit container. Quenching equipment.   The quenching oil supply pipe is composed of a plurality of supply pipes, and at least one connecting portion of each supply pipe is provided outside the quenching container and inside the unit container. The plug quenching apparatus according to claim 2.   The discharge pipe for discharging the quenching oil accumulated in the unit container is provided outside the quenching container and inside the unit container. The plug quenching device according to the above.   The plug quenching apparatus according to any one of claims 1 to 4, wherein an oil drop fall prevention means is provided between the quenching unit and the unit cover.   The plug quenching apparatus according to claim 1, wherein the quenching unit is configured to be exchangeable with another quenching unit. A plug quenching device including a quenching chamber for quenching the workpiece in a state where the inner diameter of the annular workpiece is constrained by a cored bar,
The quenching chamber is used for quenching the workpiece.
A quenching space in which the object to be processed is accommodated and filled with quenching oil;
A plug quenching device, characterized by having a sealed space formed so as to surround the quenching space and not communicating with the quenching space.   The plug quenching apparatus according to claim 7, wherein a quenching oil supply pipe for supplying quenching oil to the quenching space is provided in the sealed space.   The plug quenching apparatus according to claim 8, wherein the quenching oil supply pipe includes a plurality of supply pipes, and at least one connecting portion of each supply pipe is provided in the sealed space.

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