JP6938223B2 - Work cooling device - Google Patents

Description

The present invention relates to a work cooling device that quenches a work such as a heated rod with cooling water.

When a work such as a rod made of spring steel is continuously heat-treated while being moved in the longitudinal direction, the work heated to a high temperature is rapidly cooled by a cooling medium such as water. For example, Patent Document 1 describes an example of a cooling device used when heat-treating a work (steel wire rod). The cooling device has an outer layer pipe, an inner layer pipe, a headrace formed between the outer layer pipe and the inner layer pipe, and a large number of nozzles (injection holes) formed in the inner layer pipe. The heated work is passed through the inside of the inner layer pipe, and water is sprayed from the nozzle toward the work while moving the work in the longitudinal direction. It is stated that a hardened structure is formed by quenching the work by the jetted water.

Patent Document 2 describes a coolant injection device for mobile quenching of a work (long steel bar). The coolant injection device includes an annular jacket having a large number of nozzles for injecting water toward the work. These nozzles are arranged at a plurality of locations at equal intervals in the circumferential direction of the annular jacket, and are configured to inject water at an angle of 45 ° with respect to the work.

Special Publication No. 61-3377 Japanese Unexamined Patent Publication No. 2011-6771

The cooling device of Patent Document 1 injects water toward the work from a nozzle (injection hole) formed in the inner layer pipe. The coolant injection device of Patent Document 2 injects a coolant such as water from nozzles arranged at a plurality of locations in the circumferential direction of the annular jacket. For this reason, in both Patent Documents 1 and 2, water (coolant) vigorously hits a portion of the entire surface of the work facing the nozzle, but water does not sufficiently hit a portion off the nozzle. Therefore, the surface of the work cannot be cooled evenly, which may cause uneven quenching.

Moreover, in Patent Documents 1 and 2, the injection amount and injection speed of water depend on the diameter of the nozzle. For example, in the case of Patent Document 1, in order to change the injection amount and the injection speed, it is necessary to prepare a plurality of types of cooling devices having nozzles having different diameters and replace the cooling devices entirely as needed. Also in the case of Patent Document 2, in order to change the injection amount and the injection speed, it is necessary to prepare a plurality of types of coolant injection devices having nozzles having different diameters and replace the entire coolant injection device as necessary. be. Therefore, the injection amount and the injection speed cannot be easily adjusted.

Therefore, it is an object of the present invention that the cooling water can be evenly sprayed on the entire peripheral surface of the work, the cooling unevenness can be less likely to occur, and the bubbles and the steam film generated by the boiling of the cooling water can be eliminated. An object of the present invention is to provide a work cooling device capable of effectively cooling a work and further adjusting an injection amount and an injection speed.

The work cooling device according to one embodiment includes a water-cooled jacket having a cooling water flow path through which cooling water flows and a work insertion hole into which the work is inserted, and the cooling jacket provided on the water-cooled jacket and cooling toward the work. A work cooling device including a nozzle portion for injecting water, wherein the nozzle portion is formed at an injection flow path communicating with the cooling water flow path and a tip of the injection flow path, and is formed on the inner surface of the nozzle portion. over the circumferential direction of the nozzle portion continuously it is provided with an opening the injection port.

In this embodiment, the nozzle portions are arranged so as to be spaced apart from each other in the direction along the axis of the water-cooled jacket, and have a plurality of ring members having holes through which the workpiece passes at positions corresponding to the workpiece insertion holes. The jet flow path formed between the facing surfaces of the ring members adjacent to each other may be provided. Further, a spacing adjusting means such as a spacer ring for adjusting the spacing between the ring members adjacent to each other may be provided. Even if the injection flow path is inclined at an angle of less than 90 ° with respect to the axis of the water-cooled jacket so that the cooling water ejected from the injection port toward the work is directed to the front side in the moving direction of the work. good.

An example of the jet flow path has a shape in which the cross-sectional area of the flow path gradually decreases from the cooling water flow path toward the jet port. The jet flow path may have a rotationally symmetric shape centered on the axis of the water-cooled jacket. Further, the ring members may be arranged in three or more in the direction along the axis, and the jet flow paths may be provided between the ring members adjacent to each other. An example of the water-cooled jacket has a housing and an inner member arranged inside the housing and forming the cooling water flow path between the housing, and the work insertion hole is formed in the inner member. ..

According to the work cooling device of the present invention, cooling water can be sprayed on the entire peripheral surface of the work, so that uneven cooling can be less likely to occur. In addition, the work can be effectively cooled by eliminating air bubbles and steam films generated by boiling the cooling water. Further, when the nozzle portion is composed of a plurality of ring members adjacent to each other, the nozzle opening amount (flow path cross-sectional area) can be changed by changing the distance between the ring members, and the nozzle portion can be changed from the injection port. The amount of cooling water ejected can be adjusted.

The side view which shows typically the work processing apparatus provided with the workpiece cooling apparatus which concerns on 1st Embodiment. A cross-sectional view taken along the axial direction of the work cooling device shown in FIG. FIG. 2 is an enlarged cross-sectional view showing a nozzle portion of the work cooling device shown in FIG. FIG. 5 is a cross-sectional view showing the nozzle portion of the work cooling device in an exploded manner. The front view of the first ring member of the nozzle part of the work cooling apparatus. FIG. 3 is a cross-sectional view of a work cooling device along the line F6-F6 in FIG. The cross-sectional view along the axial direction of the work cooling apparatus which concerns on 2nd Embodiment.

The work processing device 1 provided with the work cooling device according to the first embodiment will be described below with reference to FIGS. 1 to 6.
FIG. 1 schematically shows the configuration of the work processing device 1. The work processing device 1 includes a work feeding mechanism 10 for moving the work 2, a heating device 11 for heating the work 2, a work cooling device 12 for cooling the work 2, and a temperature sensor 13 for measuring the temperature of the work 2. It includes a work diameter measuring device 14 for measuring the diameter of the work 2, a control unit 15, and the like.

An example of the work 2 is a round bar made of spring steel and having a circular cross section. The diameter D1 of the work 2 before the treatment is not particularly limited, but is, for example, 8 to 20 mm. The work diameter measuring device 14 measures the diameter of the processed work 2 by using, for example, a light emitting portion and a light receiving portion of a laser beam. The work 2 continuously moves in the direction indicated by the arrow F1 in FIG. 1 (the direction along the axis X1 of the work 2). The work may be a wire rod having a cross section other than a circular shape such as a square wire rod, or a hollow wire rod. Further, the work is not limited to a continuous wire rod, and may be, for example, a discontinuous rod or plate.

The work feed mechanism 10 includes a first roller 10a arranged on the upstream side in the moving direction of the work 2 and a second roller 10b arranged on the downstream side in the moving direction of the work 2. The first roller 10a and the second roller 10b are rotated by the drive mechanisms 16 and 17, respectively, and are pressed in the radial direction of the work 2 by a pressurizing means such as a hydraulic actuator. The rotation speed (peripheral speed) of the first roller 10a and the second roller 10b is controlled by the control unit 15, and the work 2 is moved in the direction along the axis X1 at a predetermined speed.

An example of the heating device 11 includes a high frequency induction coil 11a. The high-frequency induction coil 11a rapidly heats the work 2 to a first temperature at which quenching is possible (for example, the austenitizing temperature) near the inlet of the work cooling device 12.

The work cooling device 12 is arranged on the downstream side of the heating device 11 with respect to the moving direction of the work 2. The work cooling device 12 heat-treats (for example, quenching) the work 2 by rapidly cooling the work 2 to a second temperature. The work cooling device 12 will be described below.

FIG. 2 shows a state in which the work 2 is inserted into the work cooling device 12. The work cooling device 12 includes a water-cooled jacket 20 and an annular nozzle portion 21 provided on the water-cooled jacket 20. As will be described in detail later, the nozzle portion 21 has a shape surrounding the work 2 and injects cooling water toward the work 2. The water-cooled jacket 20 and the nozzle portion 21 may be integrally formed with each other, or may be formed of separate members from each other.

The water-cooled jacket 20 includes a cylindrical housing (outer cylinder) 30, a cylindrical inner member (inner cylinder) 31 arranged inside the housing 30, a cooling water supply port 35 provided in the housing 30, and a second. The end member 36 of 1 and the second end member 37 are provided. A cooling water flow path 40 is formed between the housing 30 and the inner member 31. The cooling water flow path 40 communicates with the cooling water supply port 35.

The cooling water supply port 35 is connected to the pump unit 42 via a cooling water pipe 41 (shown in FIG. 1). A work insertion hole 50 having a size (inner diameter) through which the work 2 can pass is formed in the inner member 31. The work insertion hole 50 extends in the longitudinal direction of the work 2 (direction along the axis X1).

As shown in FIG. 2, a first opening 50a is formed on the inlet side of the work insertion hole 50 of the inner member 31. A second opening 50b is formed on the outlet side of the work insertion hole 50. The inner diameters of the first opening 50a and the second opening 50b are large enough for the work 2 to pass through. An orifice portion 50c (shown by a two-dot chain line in FIG. 2) may be provided near the second opening 50b so as to protrude inside (inner diameter side) of the work insertion hole 50. By providing the orifice portion 50c, the cooling water in the work insertion hole 50 can be held to some extent between the work 2 and the inner member 31.

The first end member 36 is provided at the first end portion 20a of the water-cooled jacket 20. A hole 36a having a size through which the work 2 passes is formed in the first end member 36. The second end member 37 is provided at the second end 20b of the water-cooled jacket 20. A hole 37a having a size through which the work 2 can pass is formed in the second end member 37.

The cooling water flow path 40 is formed between the first end member 36 and the second end member 37, and extends in a direction along the axis X2 (shown in FIG. 2) of the water cooling jacket 20. The cooling water flow path 40 has a shape in which the inner diameter gradually increases (the cross-sectional area of the flow path increases) from the first end portion 20a to the second end portion 20b of the water cooling jacket 20. The axis X2 of the water-cooled jacket 20 substantially coincides with the axis X1 of the work 2 passing through the work insertion hole 50.

FIG. 3 is an enlarged cross-sectional view showing a part (nozzle portion 21) of the work cooling device 12. FIG. 4 is a cross-sectional view showing the nozzle portion 21 in an exploded manner. The nozzle portion 21 is arranged at the first end portion 20a of the water-cooled jacket 20. The nozzle portion 21 of the present embodiment includes three ring members 51, 52, 53 and two spacer rings 61, 62 as an example of the interval adjusting means. The ring members 51, 52, and 53 are arranged so as to be spaced apart from each other in the direction along the axis X2 of the water-cooled jacket 20.

That is, the first ring member 51 and the second ring member 52 are arranged adjacent to each other in the direction along the axis X2 with the first spacer ring 61 sandwiched between them. The second ring member 52 and the third ring member 53 are arranged adjacent to each other in the direction along the axis X2 with the second spacer ring 62 sandwiched between them.

FIG. 5 is a front view of the first ring member 51. The first ring member 51 was supported by an annular first support portion 51a, first ribs 51b formed at a plurality of locations in the circumferential direction of the first support portion 51a, and a first rib 51b. It has an annular first body 51c. The first support portion 51a is in contact with the inner surface 30a of the housing 30. A flow section 51d communicating with the cooling water flow path 40 is formed between the first support portion 51a and the first body 51c.

As shown in FIG. 4 and the like, the body 51c of the first ring member 51 has a recess 70 into which the end portion 31a of the inner member 31 is inserted and a seal wall 72 in which the seal member 71 such as an O-ring is in close contact. , A hole 73 through which the work 2 passes, and a flow path forming surface 74 formed of a convex curved surface protruding toward the second ring member 52 are formed.

The second ring member 52 was supported by an annular second support portion 52a, a second rib 52b formed at a plurality of locations in the circumferential direction of the second support portion 52a, and a second rib 52b. It has an annular second body 52c. The second support portion 52a is in contact with the inner surface 30a of the housing 30. A flow section 52d communicating with the cooling water flow path 40 is formed between the second support portion 52a and the second body 52c.

As shown in FIG. 4 and the like, the second body 52c has a flow path forming surface 80 made of a concave curved surface, a flow path forming surface 81 made of a convex curved surface, and a circular hole 82 through which the work 2 passes. Is formed. The convex flow path forming surface 81 is formed on the opposite side of the concave flow path forming surface 80. The flow path forming surface 80 of the second ring member 52 faces the flow path forming surface 74 of the first ring member 51.

A first jet flow path 85 is formed between the flow path forming surfaces 74 and 80. That is, the first jet flow path 85 is formed between the facing surfaces of the ring members 51 and 52 adjacent to each other. The first jet flow path 85 communicates with the cooling water flow path 40 via the flow section 51d. The first jet flow path 85 has a rotationally symmetric shape centered on the axis X2 of the water-cooled jacket 20. An injection port 86 is formed on the tip end side of the first jet flow path 85. As shown in FIG. 6, the injection port 86 is substantially continuously opened on the inner surface 21a of the nozzle portion 21 over the entire circumference of the nozzle portion 21. Here, "substantially continuously open" means that the injection port 86 is formed so that the cooling water evenly hits the entire circumference of the work. That is, even if a part of the circumferential direction is not continuously opened, the shape includes a shape in which the cooling water hits substantially the entire circumference of the work.

In one embodiment, as shown in FIG. 3, the first jet flow path 85 is directed with respect to the axis X2 of the water-cooled jacket 20 so that the jet port 86 faces the front side of the work 2 in the moving direction F1. It is tilted at an angle θ1 of less than 90 °. Moreover, the first jet flow path 85 has an orifice shape in which the cross-sectional area of the flow path gradually decreases from the flow section 51d communicating with the cooling water flow path 40 toward the injection port 86. Therefore, the flow velocity of the cooling water flowing from the cooling water flow path 40 through the flow section 51d to the first injection flow path 85 gradually increases toward the injection port 86, and is injected at an angle θ1 as shown by the arrow F2. It spouts vigorously from the mouth 86.

In another embodiment, the angle θ1 of the jet flow path 85 may be 90 °, and the cooling water may be ejected perpendicularly to the peripheral surface of the work 2. The jet flow path 85 of yet another embodiment is inclined at an angle θ1 larger than 90 ° with respect to the axis X2 of the water-cooled jacket 20 so that the jet port 86 faces the rear side of the moving direction F1 of the work 2. You may be.

A first spacer ring 61 is arranged between the support portion 51a of the first ring member 51 and the support portion 52a of the second ring member 52 as an example of the first spacing adjusting means. The distance between the first ring member 51 and the second ring member 52 can be changed according to the thickness T1 (shown in FIG. 4) of the first spacer ring 61. That is, the distance between the flow path forming surfaces 74 and 80 can be adjusted according to the thickness T1 of the spacer ring 61. Therefore, by changing the thickness T1 of the spacer ring 61, the flow path cross-sectional area of the first jet flow path 85 can be adjusted. As another example of the first spacing adjusting means, the distance between the first ring member 51 and the second ring member 52 is changed by a feed screw mechanism such as a ball screw, and the flow path forming surface 74 , The distance between 80 may be adjusted.

The third ring member 53 has an annular third body 53a. The peripheral surface of the third body 53a is in contact with the inner surface 30a of the housing 30. The third body 53a is formed with a flow path forming surface 90 formed of a concave curved surface and a circular hole 91 through which the work 2 passes. The flow path forming surface 90 of the third ring member 53 faces the flow path forming surface 81 of the second ring member 52.

A second jet flow path 95 is formed between the flow path forming surfaces 81 and 90. That is, a second jet flow path 95 is formed between the facing surfaces of the ring members 52 and 53 adjacent to each other. The second jet flow path 95 communicates with the cooling water flow path 40 via the flow section 52d. Like the first jet flow path 85, the second jet flow path 95 has a rotationally symmetric shape centered on the axis X2 of the water-cooled jacket 20. An injection port 96 is formed on the tip end side of the second injection flow path 95. The injection port 96 is continuously opened on the inner surface 21a of the nozzle portion 21 over the entire circumference of the nozzle portion 21.

In one embodiment, as shown in FIG. 3, the second jet flow path 95 is 90 with respect to the axis X2 of the water-cooled jacket 20 so that the jet port 96 faces the front side of the work 2 in the moving direction F1. It is tilted at an angle θ1 less than °. Moreover, the second jet flow path 95 has an orifice shape in which the cross-sectional area of the flow path gradually decreases from the flow section 52d communicating with the cooling water flow path 40 toward the injection port 96. Therefore, the flow velocity of the cooling water flowing from the cooling water flow path 40 through the flow section 52d to the second injection flow path 95 gradually increases toward the injection port 96, and is injected at an angle θ2 as shown by the arrow F3. It spouts vigorously from the mouth 96.

In another embodiment, the angle θ2 of the jet flow path 95 may be 90 °, and the cooling water may be ejected perpendicularly to the peripheral surface of the work 2. The jet flow path 95 of yet another embodiment is inclined at an angle θ2 larger than 90 ° with respect to the axis X2 of the water-cooled jacket 20 so that the jet port 96 faces the rear side of the moving direction F1 of the work 2. You may be.

A second spacer ring 62 is arranged between the support portion 52a of the second ring member 52 and the third ring member 53 as an example of the second spacing adjusting means. The distance between the second ring member 52 and the third ring member 53 can be changed according to the thickness T2 (shown in FIG. 4) of the second spacer ring 62. That is, the distance between the flow path forming surfaces 81 and 90 can be adjusted according to the thickness T2 of the spacer ring 62. Therefore, the flow path cross-sectional area of the second jet flow path 95 can be adjusted by changing the thickness T2 of the spacer ring 62. As another example of the second spacing adjusting means, the distance between the second ring member 52 and the third ring member 53 is changed by a feed screw mechanism such as a ball screw, and the flow path forming surface 81 , 90 may be adjusted.

Next, the operation of the work processing device 1 of the present embodiment will be described.
As shown in FIG. 1, the work 2 is moved by the first roller 10a, the second roller 10b, and the like in the direction indicated by the arrow F1. The moving work 2 is heated to the first temperature by the heating device 11. The work 2 heated by the heating device 11 is rapidly cooled to a second temperature by the work cooling device 12.

As shown in FIG. 3, in the nozzle portion 21 of the work cooling device 12, the cooling water is ejected from the injection ports 86 and 96. Moreover, this cooling water is obliquely ejected from the injection ports 86 and 96 toward the front side of the work 2 in the moving direction F1. The injection ports 86 and 96 are continuously opened over the entire circumference of the inner surface 21a of the nozzle portion 21, respectively. Therefore, the cooling water ejected from the injection ports 86 and 96 is evenly ejected from the entire circumference of the nozzle portion 21 toward the work 2 as shown by an arrow F4 in FIG. Therefore, the cooling water can be applied to the entire peripheral surface of the work 2, and the work 2 can be cooled substantially evenly.

When the cooling water comes into contact with the high-temperature work 2, the cooling water boils to form bubbles or a steam film, but the cooling water ejected from the injection ports 86 and 96 violently collides with the work 2 to eliminate the bubbles or the steam film. The work 2 is effectively cooled by the low-temperature cooling water coming into contact with the work 2 one after another. The cooling water that hits the work 2 passes through the work insertion hole 50 along the surface of the work 2 and is discharged to the outside from the second end 20b of the water-cooled jacket 20 as shown by an arrow F5 in FIG.

The injection flow paths 85 and 95 of the present embodiment have angles θ1 and θ2 with respect to the axis X2 so that the cooling water ejected from the injection ports 86 and 96 faces the front side of the moving direction F1 of the work 2 (shown in FIG. 3). It is tilted. Therefore, even if the heating device 11 is arranged in the vicinity of the first end portion 20a of the water cooling jacket 20, it is possible to prevent the cooling water injected from the injection ports 86 and 96 from heading toward the heating device 11. It is possible to avoid the problem caused by the heating device 11 being exposed to water.

As described above, the jet flow paths 85 and 95 formed by the ring members 51, 52 and 53 have a rotationally symmetric shape centered on the axis X2. That is, the opening amount (flow path cross-sectional area) of the injection ports 86, 96 does not change regardless of the relative positions of the ring members 51, 52, 53 around the axis X2. Therefore, when assembling the work cooling device 12, the ring members 51, 52, 53 are arranged on the water cooling jacket 20 without worrying about the positions of the ring members 51, 52, 53 with respect to the water cooling jacket 20 around the axis X2. Can be done.

FIG. 7 shows the work cooling device 12 ′ according to the second embodiment. The work cooling device 12'is provided with a suction mechanism 100 on the inlet side (first end portion 20a) of the water cooling jacket 20. The suction mechanism 100 includes a chamber 110 arranged between the nozzle portion 21 and the heating device 11, and a negative pressure generating means 111 for generating a negative pressure inside the chamber 110.

The suction port 112 of the chamber 110 opens in the vicinity of the nozzle portion 21 and communicates with the gap 113 between the inner surface 21a of the nozzle portion 21 and the work 2. The cooling water ejected from the injection ports 86 and 96 bounces off the surface of the work 2. Therefore, a part of the cooling water may move in the direction of the heating device 11. However, the cooling water moving in the direction of the heating device 11 is sucked into the chamber 110 by the negative pressure in the chamber 110.

Since the work cooling device 12'provided with such a suction mechanism 100 can more effectively suppress the cooling water injected from the injection ports 86 and 96 toward the heating device 11, the heating device 11 can be used. It is possible to avoid being flooded more reliably. Other configurations Since the work cooling device 12'of the second embodiment is common to the work cooling device 12 of the first embodiment, common reference numerals are given to common parts of both, and the description thereof is omitted. do.

In carrying out the present invention, specific aspects such as the shape and arrangement of the components of the work cooling device, such as the housing and inner member constituting the water-cooled jacket and the ring member constituting the nozzle portion, are modified as necessary. Needless to say, it can be implemented. Further, the number of ring members may be two (that is, one jet flow path), or the number of ring members may be four or more (three or more jet flow paths).

1 ... Work processing device, 2 ... Work, X1 ... Work axis, 11 ... Heating device, 12 ... Work cooling device, F1 ... Work direction, 20 ... Water-cooled jacket, X2 ... Water-cooled jacket axis, 21 ... Nozzle , 21a ... Inner surface, 30 ... Housing, 31 ... Inner member, 35 ... Cooling water supply port, 40 ... Cooling water flow path, 50 ... Work insertion hole, 51 ... First ring member, 52 ... Second ring member, 53 ... 3rd ring member, 61 ... 1st spacer ring (interval adjusting means), 62 ... 2nd spacer ring (interval adjusting means), 73 ... hole, 74 ... flow path forming surface, 80 ... flow path forming surface , 81 ... Flow path forming surface, 82 ... Hole, 85 ... First jet flow path, 86 ... Injection port, 90 ... Flow path forming surface, 91 ... Hole, 95 ... Second jet flow path, 96 ... Injection port ..

Claims (6)

A water-cooled jacket having a cooling water flow path through which cooling water flows and a work insertion hole into which a work is inserted.
A nozzle portion provided on the water-cooled jacket and ejecting the cooling water toward the work,
It is a work cooling device equipped with
The nozzle portion
An injection flow path communicating with the cooling water flow path,
Formed at the tip of the injection passage, the injection port which opens continuously over the inner surface of the nozzle portion in the circumferential direction of the nozzle portion,
Equipped with
The nozzle part
A plurality of ring members arranged so as to be spaced apart from each other in the direction along the axis of the water-cooled jacket and having a hole through which the work passes at a position corresponding to the work insertion hole.
It is provided with the jet flow path formed between the facing surfaces of the ring members adjacent to each other, and
A work cooling device characterized in that a spacer ring having a thickness corresponding to the distance between the ring members is provided between the ring members adjacent to each other. The injection flow path is inclined at an angle of less than 90 ° with respect to the axis of the water-cooled jacket so that the cooling water ejected from the injection port toward the work is directed to the front side in the moving direction of the work. The work cooling device according to claim 1. The work cooling device according to claim 1, wherein the jet flow path has a shape in which the cross-sectional area of the flow path gradually decreases from the cooling water flow path toward the injection port. The work cooling device according to claim 1, wherein the jet flow path has a rotationally symmetric shape centered on the axis of the water-cooled jacket. The work cooling device according to claim 1, wherein three or more of the ring members are arranged in a direction along the axis, and each of the ring members adjacent to each other has the jet flow path. The water-cooled jacket
With the housing
It has an inner member that is arranged inside the housing and forms the cooling water flow path with the housing.
The work cooling device according to claim 1, wherein the work insertion hole is formed in the inner member.

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