JPS606426Y2 - Quenching bath rectifier - Google Patents

Description

[Detailed description of the invention] The present invention is a quenching device that quenches heated metal parts by placing them on a lifting platform and immersing them in a quenching bath. This invention relates to an improvement in the handling method of the rectifying matsufuru that rectifies the flow.

BACKGROUND ART Salt bath quenching is conventionally known as a heat treatment method for metal parts such as steel parts that require high-precision quenching.

By the way, for example, when quenching a large number of metal parts with complexly changing surface shapes, such as steel gears, on a pallet, the salt solution covers the center and outside of the entire metal parts immersed in the bath. Regardless of the situation, extreme care must be taken to ensure uniform flow, and it is known that a rectifying ring is provided that surrounds the entire metal part as a ring.

In a hardening device that uses such a straightening matsufuru, metal parts to be hardened are placed on a lifting table, and the lifting table is moved up and down with respect to the quenching bath, when placing the metal parts on the lifting table, There is a handling problem in that the rectifier Matsufuru must be temporarily removed from the lifting platform and the metal parts placed on it, and then the rectifier Matsufuru must be fitted from above.Especially to avoid oxidation in the air. When metal parts taken out of a heating furnace need to be immersed in a quenching bath at an early stage, handling of the rectifying matsuru becomes a problem.

The present invention was made in view of such problems, and
By raising and lowering the rectifying matsufuru at an appropriately faster speed than the lifting platform for metal parts, the rectifying matsufuru is retracted to an upper position where it does not hinder the loading and unloading of metal parts at the elevated position of the lifting platform, and is used for hardening. When lowering the lifting platform, the rectifying mapple can be placed on the lifting platform after a predetermined position, and the metal parts can be immersed in the quenching bath with the rectifying matsuffle surrounding the metal parts. The object of the present invention is to provide a quenching bath rectifier that can be automatically operated in accordance with the elevation.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

In the figure, 1 is a quenching tank installed on a foundation 2, and 3 is a metal part 5 supported by a quenching pallet 4 (in the figure,
Although shown diagrammatically, it is usually a group of parts, such as gears, for each lot.

) is immersed in a quenching salt bath (hereinafter referred to as quenching bath) A; This rectifying matsufuru 6 surrounds the duct 7 provided in the quenching tank 1 by means of a stirring fan 8 provided facing the inside of the duct 7. It is set to rectify the liquid flowing vertically upward into the part 5 so as to form a uniform laminar flow with respect to the surface of the metal part 5.

The lifting platform 3 is formed as a framework so as not to obstruct the flow of the liquid when immersed in the quenching bath A, and has pairs of left and right columns 9a extending vertically upward from the four corners of the platform 3a.
, 9b is the upper frame 1 of the quenching tank 1 shown in phantom lines in the figure.
The hooks are connected to the lower ends of the left and right pairs of chains 15.16 as the first cables, which are connected to the left and right pairs of pulleys 13.14 attached to the rotating shaft 11.12 which is mounted on the rotary shaft 11.12. , are suspended and supported by these chains 15, 16.

These 15 and 16 are turned vertically downward by a pair of pulleys 17 for deflection, and each of the lower ends is a pair of long air plates installed vertically upward along the side wall of the quenching tank 1. It is connected to the tip of the plunger of the cylinder 18 via a connecting fitting 19.

Therefore, by operating the air cylinder 18 and raising the plunger, the lifting platform 3 is lowered from the raised position A shown by the solid line in the figure, and the metal parts 5 supported on the lifting platform 3 are moved down as shown by the phantom line in the figure. is lowered to the predetermined quenching position opening of quenching bath A, and after quenching is completed, the air cylinder 19
By driving in reverse, an elevating drive system for the elevating table 3 that raises the elevating table 3 from the quenching position opening to the ascending position A is formed.

On the other hand, the rectifying matsufuru 6, like the elevating table 3,
It is suspended and supported by a pair of chains 20.21 as a second cable, and each of these chains 20.21 is sufficiently connected to a pulley 13.14 coaxially fixed to the rotation axis 11.12 of the pulley 13.14. It is wound around a large-diameter winding pulley 22.23, and its tip is fixed to the winding pulley 22.23.

Therefore, each chain 20.21 that suspends and supports the rectifying matsufuru 6 is connected to the suspension chain 15.16 of the lifting platform 3.
compared to the winding pulley 22 for the radius of pulley 13.14.
．． The rectifying matful 6 is driven at high speed at a ratio equal to the ratio of the radii of the rectifying table 23, and constitutes an elevating drive system for the rectifying matful 6 that can raise and lower the rectifying matful 6 at a speed faster than the lifting speed of the lifting platform 3.

In this case, the winding pulleys 22 and 23 are in the raised position A of the lifting table 3, and the rectifying matsuru 6 is located above the metal parts 5 supported by the pallet 4 on the lifting table 3, while facing towards the quenching position opening. When the lifting platform 3 is lowered, the lifting platform 3
When the pallet 4 descends at a higher speed and reaches an appropriate position in front of the quenching position, for example, the liquid level of the quenching bath A, the lower edge of the rectifying matsufuru 6 comes into contact with the pallet 4, and from then on, the rectifying matsufuru 6 The diameter ratio of the pulleys 13 to 14 is designed so that the pallet 4, that is, can be lowered together with the lifting platform 3.

The point is to make the quenching uniform, and as long as there is no adverse effect, the metal parts may be surrounded by matsufuru before the immersion is completed.

In the figure, reference numerals 24 and 25 designate guide pulleys that guide the chains 20 and 21 that are wound around or unwound around the winding pulleys 22 and 23 in order to correctly raise and lower the rectifying matsufuru 6 in the vertical direction.

As described above, when a lifting drive system is provided for the rectifying matsufuru 6 to raise and lower the rectifying matsufuru 6 at a speed faster than the lifting speed of the lifting platform 3, as shown in the figure, the lifting position of the lifting platform 3 is Since the rectifying Matsufuru 6 can be automatically retracted above the metal parts 5 on the pallet 4, the hardened metal parts 5 and the pallet 4 can be taken out from the lifting platform 3 and placed in the heating furnace in advance. The metal parts 5 heated to a predetermined temperature can be quickly loaded onto the lifting platform 3 together with the pallet 4 without being hindered by the rectifying matsufuru 6. Then, by lowering the lifting platform 3, the metal parts 5 can be loaded onto the lifting platform 3 together with the pallet 4. Immediately before being immersed in the quenching bath A, the rectifying matsufuru 6 catches up with the pallet 4 and surrounds the metal parts 5 to be quenched, and thereafter, when descending to the quenching position and at the final quenching position,
It is possible to straighten the flow of the liquid over the entire metal part 5 and to make the temperature of the entire area through which the liquid passes approximately uniform.

Therefore, any metal component 5 within the pallet 4 can be hardened to a uniform hardness.

In the above embodiment, the pulleys 22 and 23 having a larger diameter than the pulleys 13 and 14 involved in raising and lowering the lifting platform 3 are used as the pulleys 13 and 23.
3.14 was installed coaxially with the pulley 13.14 to speed up the movement of the rectifying matsufuru 6. For example, a large-diameter intermediate gear may be attached to the pulley 13.14.
14, and rotate a large-diameter gear that meshes with this intermediate gear.A winding pulley 22.23 is installed coaxially with this gear, and the rectifying Matsufuru 6 is wound up on a separate shaft from the pulley 13.14. Needless to say, it is also possible to rewind the video.

As described above, the present invention suspends and supports the lifting platform for metal parts to be hardened and the rectifying matsuru by the first and second cables, respectively, and the second cable is connected to the first cable by the first cable. An elevating drive system is provided for the rectifying matsufuru that is synchronized with the drive of the first cable and driven at a higher speed than the first cable, and when the lifting platform is in the raised position, the rectifying matsufuru is placed in an upper position that does not hinder the loading and unloading of metal parts. To provide a rectifying device for a quenching bath, which automatically retracts the quenching bath and surrounds the metal parts to be hardened with a rectifying matsufuru before the normal quenching position when lowering the lifting platform.

According to the present invention, the operation of the rectifying matsuffle can be automated with a simple and inexpensive device, and the loading and unloading of metal parts to be hardened or already hardened can be carried in and out quickly and easily without being hindered by the rectifying matsufuru. You can get the effect that you can use.

Although the embodiment of salt bath quenching has been described above, it can also be applied to oil quenching.

[Brief explanation of drawings]

The figure is an overall schematic explanatory diagram of a salt bath quenching apparatus showing an embodiment of the rectifying device according to the present invention. A... Quenching bath, 3... Lifting platform, 5...
...Metal parts, 6...Matsuful for rectification, 1
3, 14... Pulley, 15. 16... First rope, 18... Air cylinder, 20, 21
...Second rope, 22, 23... Winding pulley.

Claims (2)

[Scope of utility model registration request] (1) In a device in which heated metal parts are placed on a lifting platform and quenched in a quenching bath, a first rope for suspending the lifting platform, a pulley for engaging the first rope, and a first A driving source for driving the cables is provided to form a lifting platform drive system for driving the lifting platform up and down, while a rectifying matsufuru for surrounding metal parts on the lifting platform and a hanging support for the rectifying matsufuru are provided. A winding pulley having a diameter larger than that of the pulley and rotating synchronously at a faster circumferential speed than the pulley to wrap the second cable around is provided so that the rectifying matsufuru can be moved at a higher speed than the lifting platform. The rectifier Matsufuru drive system is used to drive the rectifier up and down, and when the elevator is in the raised position, the rectifier Matsufuru is retracted above the metal parts, and after the elevator has descended to the specified position, it is brought into contact with the elevator. A rectifier for a quenching bath. (2) Utility model registration The quenching bath rectifier according to claim 1, characterized in that the winding pulley has a larger diameter than the pulley of the lifting platform drive system and is installed coaxially with the pulley.