JP3037333B1 - Heat treatment equipment for sizing press - Google Patents

Abstract

An object of the present invention is to provide a heat treatment facility for a sizing press that does not cause damage to a restraint ring or the like due to deformation of a processing material and that can prevent oxidation of cooling oil or discoloration of the processing material. SOLUTION: A heating furnace T maintained in a predetermined atmosphere,
In the heat treatment equipment for sizing press including a primary cooling chamber A provided with a cooling oil tank 4, a secondary cooling device C provided with a sizing press device B, a cleaning device D and a tempering furnace E, extraction of the heating furnace A primary cooling chamber connected to the unit via a door, wherein the primary cooling chamber is provided with an extraction vessel 2 filled with a predetermined atmospheric gas and having purging means, and the heating furnace When the process material transport unit of the primary cooling chamber constituted by the roller table R ₀ to R ₇ which is arranged at the same height, the treatment material to the roller table R _2, R ₃ of the cooling oil tank upward in the cooling oil O It can be raised and lowered so that it can be immersed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat treatment facility for a sizing press.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a heat treatment facility for sizing press for quenching bearing members (for example, outer races and inner races of bearing races) includes a mesh belt type heating furnace T 'and a primary cooling furnace. It comprises a chamber A ', a secondary cooling device C' provided with a sizing press device B ', a cleaning device D' and a tempering furnace E '.

As shown in FIG. 6, the primary cooling chamber A 'includes a cooling oil tank 40, in which a roller table 41 is provided. The charging section 40a and the extraction section of the heating furnace T 'are connected via an extraction chute 44.
Loading lifter 4 which is raised and lowered by a cylinder 43 at the lower end of
2 is provided.

A sealing door 45 is disposed above and below the extraction section 40b of the cooling oil tank 40 so as to be able to move up and down. When the processing material W is not extracted from the cooling oil tank 40, the extraction section (opening) is provided.
40b and the cooling oil O
The space G between the oil level and the charging section 40a and the extracting section 40b is set to an N ₂ gas atmosphere in order to prevent oxidation of the oil.

[0005] The processing material W charged into the heating furnace T 'is heated to 800 to 850 ° C in a predetermined atmosphere, slides down on the extraction chute 44 from the extraction section, and slides into the charging lifter 42. The processing material W is once positioned on the roller table 41, and then is moved onto the roller table 41 provided in the cooling oil tank 40 by lowering the loading lifter 42. The atmosphere inside the heating furnace T ′ is such that an endothermic metamorphic gas, a nitrogen gas, an enriched gas (for example, butane),
If necessary, it is formed by supplying ammonia gas.

[0006] The processing material W transferred onto the roller table 41 is sent forward by a pusher 46 provided on the side of the cooling oil tank 40, during which it is cooled to a sizing press temperature of 200 to 230 ° C. An extraction lifter (not shown) reaches the upper part of the extraction unit 40b. When the extraction lifter (not shown) rises, the seal door 45 opens the extraction unit 40b. The loading lifter 42 also returns to its original position,
It waits for the next processing material W to be charged.

[0007] As described above, the processing material W is extracted from the extraction unit 40b.
When it is located above, the processing material W is shifted to the sizing press position of the secondary cooling device C ′ by the press loading loader 47, is inserted into the restraining ring 49 of the sizing press device B ′, and is restrained by the sizing press machine 48. After processing, the treated material W is corrected into a predetermined shape, and then falls onto the conveyor 51 in the cooling oil tank 50 of the secondary cooling device C ′, and
Cool to 0-80 ° C. Then, the cooled processing material W
Is spray-cleaned on the conveyor 51 of the cleaning device D ′ to remove adhering oil, and then dried by air blow. The treated material W washed with water is used in a tempering furnace E '.
Is reheated to about 170 ° C. and tempered.

[0008]

However, the above facilities have the following problems. The processing material W slides down from the heating furnace T ′ by the extraction chute 44 and is charged by the charging lifter 4.
2, the inclination angle of the extraction chute 44 is an angle at which the smallest processing material can be slid out of the various types of processing material. In addition to colliding with a stopper (not shown) provided at 44 to give an embossed flaw to the processing material W, the embossed flaw of the processing material W is in a state where a projection is formed,
There is a problem that the restraint ring 49 and the like are damaged during the sizing press.

The primary cooling chamber A 'contains an acid of the cooling oil O.
A sealing door 45 is provided in the extraction unit 40b to prevent
The inert gas is provided in the space G formed above the surface of the cooling oil O.
Su (N _TwoGas) and the sealing door 45 is closed.
Sometimes the inert gas is supplied,
When the material W is carried out of the primary cooling chamber A ', the seal door 45 is opened.
Therefore, outside air enters each time the processing material W is carried out,
An air pocket is formed in the space G. Therefore, cooling oil
Oxidized surface of processing material W coming out of O
Then, the processing material W turns black and becomes defective, or
In addition, the deterioration of the cooling oil O is accelerated due to the incorporation of air.
The cooling oil has to be changed often
Have issues.

Further, even if the transfer speed in the heating furnace T 'is to be increased in order to improve the productivity, the transfer method of the processing material W in the cooling oil tank 40 of the primary cooling chamber A' is changed to the cooling oil tank. Due to the pusher 46 provided on the side portion 40, that is, since the pusher 46 performs a reciprocating motion, a predetermined waiting time is required until the next transfer of the processing material W, so that the speed cannot be increased so much that the productivity is improved. There is a problem that can not be.

Accordingly, the present invention prevents the processing material from being stamped while being transported from the heating furnace to the primary cooling chamber, and does not damage the restraining ring of the sizing press device. It is a first object of the present invention to provide a heat treatment facility for a sizing press which eliminates discoloration of the sizing, prevents oxidation of the cooling oil, and causes less deterioration of the cooling oil. It is a second object of the present invention to provide a sizing press heat treatment facility capable of improving productivity as compared with the related art.

[0012]

In order to achieve the above object, the present invention provides a heating furnace maintained in a predetermined atmosphere, a primary cooling chamber having a cooling oil tank, and a sizing press device. In a heat treatment facility for sizing press comprising a secondary cooling device, a washing device and a tempering furnace, a primary cooling chamber is connected to an extraction part of the heating furnace via a door, and the primary cooling chamber has a predetermined atmosphere. A gas table is provided and an extraction vestibule having a purging means is provided, and the heating furnace and a processing material conveying means in a primary cooling chamber are constituted by a roller table provided at the same height, The roller table on the cooling oil tank can be moved up and down so that the processing material can be immersed in the cooling oil. Further, it is preferable that a roller table located on the heating furnace side among the transport roller tables in the primary cooling chamber has a structure capable of tilting from a horizontal state. Further, it is preferable that the roller tables to be immersed are two roller tables that are independently driven and moved up and down.

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 4 show a first embodiment of a heat treatment equipment for a sizing press according to the present invention, and generally include a heating furnace T, a primary cooling chamber A, and a sizing press device B similar to the conventional one described above. And a cleaning device D (not shown) and a tempering furnace E (not shown).

[0014] processing material conveyance method of the heating furnace and T is the roller hearth type consisting of roller table R _0.

[0015] The primary cooling chamber A has a charging section connected in series through an elevating door 1 provided in an extraction section of the heating furnace T. The extraction section is provided with a first extraction section provided at a predetermined interval. , The extraction best 2 constituted by the second liftable partition doors 3a, 3b. The extraction vessel 2 is provided with a purging means including a purge N ₂ gas supply pipe and a discharge pipe, and the primary cooling chamber A is filled with N ₂ gas.

The cooling oil tank 4 is provided in the primary cooling chamber A.
And a plurality of transport roller table groups R _{1 to} R ₅ at the same level as the in-furnace transport roller table R _{0 of the} heating furnace T are provided above the cooling oil tank 4. The cooling oil O in the cooling oil tank 4 is maintained at a predetermined temperature by ON / OFF control of an electric heater and an oil cooler (not shown).

The bottom of the cooling oil tank 4 is provided with an auxiliary cooling oil tank 5
The upper part communicates with the auxiliary cooling oil tank 5 through an oil return pipe 8 while the cooling oil O from the oil supply pipe 7 From above to cool the processing material W. The cooling oil O overflowing from the cooling oil tank 4 returns to the auxiliary cooling oil tank 5 from the oil return pipe 8 and is circulated.

[0018] The heating furnace T in the first heating furnace T side of the conveying roller table R ₁ disposed between the cooling oil vat 4 in the primary cooling chamber A from a horizontal state by a driving mechanism (not shown), shown has a bridge type conveying roller table R _1-1 made possible 90 ° tilt as, also, the second located above the cooling oil tank 4, the third conveying roller table (first, second oil tank The elevating roller tables R ₂ and R ₃ can be raised and lowered by the following means, so that the processing material W can be immersed in the cooling oil O of the cooling oil tank 4 and can be transported in the immersion state.

Specifically, as shown in FIGS. 3 and 4,
The first oil tank lifting roller table R _TwoEach roller 11
Are in the casing 12 located in the cooling oil tank 4.
Both ends are supported. In addition, the iron shell 10 of the primary cooling chamber A
The tip of the rod 14 of the cylinder 13 installed outside
A rotation that rotates through a bearing device 15 provided on the steel shell 10
Connected to an arm 17 provided at one end of the rotation shaft 16,
The arm 18 attached to the other end of the rotary shaft 16
Attachment part provided with muf follower 19 on the side wall of casing 12
It is located in the opening 21 formed in the material 20,
The casing 12 (first oil tank)
Elevating roller table R_Two) Follows a guide not shown
To go up and down. Other second oil tank lifting roller
Table R_ThreeIs exactly the same.

One of the rollers 11 supported by the casing 12 is connected via a bevel gear 22, a bearing 23, and a universal joint 24 to a motor 25 installed outside the steel shell 10, and to another motor 25. The rollers are connected to each other by a gear 26. Therefore, the first and second oil tank elevating roller tables R ₂ and R ₃ can independently move up and down and drive the rollers.

Between the extraction vestible 2 and the sizing press B of the second cooling device C, a sixth transport roller table R ₆ and a seventh transport roller table R _{7 which} is moved up and down by a lifting cylinder 30 are provided. It is arranged at the same level as the transport roller table groups R _{1 to} R ₅ in the next cooling chamber A.

[0022] When the seventh conveying roller table R ₇ capable the lifting becomes the same level as the skid rails 31 descends, the processing material W on the elevatable seventh conveying roller table R ₇ is press charging loader 32 As a result, it moves on the skid rail 31 and moves to the sizing press position. Others are the same as the conventional ones, and the description is omitted.

Next, the operation of the heat treatment equipment for sizing press having the above configuration will be described. First, in the state of FIG. 1, the processing material W is transported in the heating furnace T by the in-furnace transport roller table (hearth roller) R ₀ , and is heated to a predetermined temperature (800 to 850 ° C.) during that time to reach the vicinity of the extraction unit. When the detector SW ₁ that the senses, furnace T and the door 1 partitioning the primary cooling chamber a is open, then the bridge-type conveyance roller table R _1-1 of the primary cooling chamber a shown together becomes horizontal state from the state to drive the bridge-type conveyance roller tables R _1-1 and first the rollers of the conveying roller table R _1, wherein the processing material W is led from the furnace T to the primary cooling chamber a, It reaches a predetermined position just before the cooling oil tank 4.
If this is the detector SW ₂ detects, the first oil tank lifting roller tables R ₂ roller is driven, the processing material W is conveyed to a predetermined position of the conveying roller table R _2.

[0024] When said processed material W is conveyed to a predetermined position of the first oil tank lifting roller tables R ₂ is detector SW ₃ for detecting the bridge type conveying roller table R _{1 -1,} a first conveying roller with roller tables R ₁ and first lifting roller tables R ₂ are driven down, at the same time the bridge type conveying roller table R _1-1 returns to the vertical state, the first, second oil tank lifting roller tables R
₂ and R ₃ are lowered, and the processing material W on the first oil tank elevating roller table R ₂ is introduced into the cooling oil O, and the cooling oil O
The stay time in the inside is measured by a timer (not shown).
As described above, when the first and second oil tank elevating roller tables R ₂ and R ₃ are lowered to the lowest position, the door 1 is closed.

As described above, when the first and second oil tank raising and lowering roller tables R ₂ and R ₃ are lowered to predetermined positions, the rollers are driven again, and the processing material W on the first oil tank raising and lowering roller table R ₂ is moved. is transported to a predetermined position of the second oil tank lifting roller tables R _3. When that process material W has come to the predetermined position detector SW ₄ for detecting the first, the second oil tank lifting roller tables R _2, R ₃ of the roller is stopped, then, the first oil tank lifting roller tables Only R ₂ rises and stands by at the original standby position for the next processing material W.

On the other hand, the second oil tank elevating roller table R
When the residence time of ₃ on the processing material W is a predetermined time (e.g. 8 seconds) elapses, the second oil tank lifting roller tables R ₃ increases, during which treating material W is the primary cooling (150-160
° C). Further, the first partition door 3a at the same time as the rise of the second oil tank lifting roller tables R ₃ is opened.

When the second oil tank elevating roller table R ₃ stops at the standby position, the second oil tank elevating roller table R ₃ , the fourth conveying roller table R _4, and the fifth conveying roller table in the extraction best 2 driven rollers of R ₅ is, the processing material W is charged into the predetermined position of the extracted Besuchiburu 2. Incidentally, the detector SW ₅ is processing material W is 4
When it is detected that the processing material W has passed through the transport roller table R ₄ and the detector SW ₆ detects that the processing material W has been carried into the predetermined position of the fifth transport roller table R ₅ in the extraction best 2, the second oil tank is detected. The rollers of the lifting roller table R ₃ , the fourth transport roller table R _4, and the fifth transport roller table R ₅ are stopped, and the first partition door 3a is closed. Then, at the same time when the second partition door 3b is opened,
A fifth transport roller table R ₅ each roller is driven in the sixth conveying roller table R _6, processing material W is conveyed to a predetermined position of the sixth conveying roller table R _6. Processing material W is 6th
The detector SW ₇ detects that the sheet has been transferred to the transport roller table R _6.
When but detecting, the second partition door 3b is closed, for the extraction Besuchiburu within 2 to expel air that enters through the opening of the second partition door 3a, the predetermined time N ₂ gas into the extraction Besuchiburu 2 (e.g. 12 seconds ) The air in the extraction best 2 is supplied and discharged, and the air is purged.

[0028] Thereafter, the processing material W is detector SW ₈ that has come to the predetermined position of the sixth conveying roller table R ₆ detects the lifting as well as low-speed driving after roller sixth conveying roller table R ₆ is stopped temporarily The possible seventh transport roller table R ₇ is also driven at the same speed, and the processing material W is transported to a predetermined position on the seventh transport roller table R ₇ which can be moved up and down. When the detector SW ₉ detects that the processing material W has reached the predetermined position, the drive of the sixth transport roller table R ₆ and the vertically movable seventh transport roller table R ₇ is stopped, and the seventh transport roller table R ₇ is stopped. The table R ₇ starts to be lowered by the lifting cylinder 30. Then, that seventh conveying roller table R ₇ is lowered to a predetermined position detecting means SW ₁₀ stops descending and detects.

[0029] The detector by detecting the SW _10, a seventh processing material W on the transport rollers table R ₇ is press charging loader 3
By 2 is conveyed to the sizing press position via the skid rails 33, when the state detecting means SW ₁₁ detects the press charging loader 32 the program returns to the original position, it descends sizing press machine 34, the processing material W is cooled by the oil injection in the constraining ring 35 and the shape thereof is corrected, and is injected into the cooling oil of the secondary cooling device C.
Next cooling (60 to 80 ° C.) completes the quenching treatment of the processing material W.

The processing material W charged into the cooling oil of the secondary cooling device C reaches a cleaning device D (not shown) by the conveyor 36, and excess oil adhering to the processing material W is removed as in the conventional case. Then, it is cooled to 30 ° C. or lower, and then reheated to about 170 ° C. in a tempering furnace E to perform a tempering treatment.

In the first embodiment, the processing material W
Is a one-line transport roller table R ₀~ R₇Place to process in
However, as shown in FIG.
And one sizing press B, heating furnace T
And inside the primary cooling chamber A, the same configuration as above
Quenching may be performed efficiently as two lines. this
In this way, without increasing the width of the equipment,
Production efficiency can be doubled with the same installation space
You. The detector SW₁~ SW₁₁Omitted for
It is.

In the above embodiment, the primary cooling chamber A
Although the first part of the conveying roller table R ₁ of the inner and the bridge type conveying roller table R _1-1 tilting type, fully taking the roller pitch greater processing material W is heated furnace T and the first cooling chamber If you can arranged without trouble roller lifting of the door 1 partitioning the a is a bridge-type conveyance roller tables R _1-1
You don't have to.

Further, in the above embodiment, the two first and second oil tank lifting roller tables R which individually drive and raise and lower the vertically movable transport roller table immersed in the cooling oil O are provided.
₂ and R ₃ , but this may be one. But,
If there is one, the next processing material W cannot be immersed until the processing material W is transferred onto the fourth transport roller table R ₄ located on the extraction side of the first cooling chamber A, and the waiting time However, if the number is two, the immersion step can be performed with a shorter waiting time, and the productivity can be improved.

[0034]

As is apparent from the above description, according to the present invention, since the processing material transport from the heating furnace to the exit from the primary cooling chamber is the roller transport arranged at the same level, the prior art As described above, the heated processing material is conveyed without colliding with anything, and the processing material does not suffer from embossing and does not damage the restraining ring or the like during the sizing press.

Further, since the heating furnace and the primary cooling chamber are connected to each other and are separated by a door, the atmosphere in the primary cooling chamber does not flow into the heating furnace and the atmosphere in the heating furnace is stabilized. In addition, since the extraction section of the primary cooling chamber is equipped with an extraction best, there is no invasion of outside air into the primary cooling chamber, preventing surface oxidation of the processing material and oxidation (deterioration) of the cooling oil. In addition, the frequency of changing the cooling oil is low and the cost is low.

Further, when the roller table on the heating furnace side of the primary cooling chamber is a tilting bridge-type conveying roller table, the roller can be positioned within the range of raising and lowering the door. Can also be applied to those having small values.

Furthermore, the oil tank lifting roller table for immersing the processing material in the cooling oil is constituted by two transport roller tables that can be driven and raised and lowered separately, so that the cooling oil can be cooled. The immersion pitch of the processing material can be shortened, and the processing efficiency can be improved accordingly.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a heat treatment facility for sizing press according to the present invention.

FIG. 2 is a schematic view showing another embodiment.

FIG. 3 is a front view of the oil tank elevating roller table shown in FIGS. 1 and 2;

FIG. 4A is a front view showing the lifting mechanism of FIG. 3;
(B) is a plan view of (A).

FIG. 5 is a schematic view of a conventional heat treatment facility for sizing press.

FIG. 6 is a partially enlarged view of FIG. 5;

[Explanation of symbols]

 T ~ heating furnace, A ~ primary cooling chamber, B ~ sizing press equipment
, C-secondary cooling device, D-cleaning device, E-tempering furnace, 1
~ Door, 2 ~ extractable, 3a ~ first partition door, 3b ~
2nd partition door, 4 ~ cooling oil tank, 32 ~ press loading loader,
35 ~ Ring ring, R₀~ Furnace transfer roller table,
R₁, R_Two... R₇~ Transport roller table, R _1-1~ Buri
Ledge type transport roller table, SW₁, SW_Two... SW₁₁
~ Detector, W ~ Processing material.

Claims (3)

(57) [Claims] 1. A sizing press comprising a heating furnace maintained in a predetermined atmosphere, a primary cooling chamber provided with a cooling oil tank, a secondary cooling device provided with a sizing press device, a cleaning device and a tempering furnace. In the heat treatment equipment, a primary cooling chamber is connected to an extraction part of the heating furnace via a door,
The primary cooling chamber has a structure in which a predetermined atmospheric gas is filled and an extraction vessel having a purging means is provided, and the heating furnace and the processing material conveying means of the primary cooling chamber are arranged at the same height. A heat treatment equipment for a sizing press, wherein the heat treatment equipment for a sizing press comprises a roller table formed above, and the roller table above the cooling oil tank can be moved up and down so that the processing material can be immersed in the cooling oil. 2. The transfer roller table in the primary cooling chamber, wherein a roller table located on the heating furnace side is configured to be tiltable from a horizontal state.
The heat treatment equipment for sizing press described in 1. 3. A roller table above the cooling oil tank,
The heat treatment equipment for a sizing press according to claim 1 or 2, wherein the roller table is independently driven and moved up and down.