KR20060050443A - Method and apparatus for induction heat treatment - Google Patents

Abstract

Provided is a high frequency heat treatment apparatus capable of reducing the deformation of the rail for linear motion bearings which has been hardened and after friction.

The high frequency heat treatment apparatus 10 supplies a plurality of calibration rollers 12, 13, and the like to be conveyed while calibrating the workpiece W, and a cooling liquid to the induction heating coil 30 and the groove W2 for heating the groove W2 of the workpiece W. The injector cooler 32 and the induction heating coil 34 for soaking in order to cool the groove | channel W2 are provided. A plurality of straightening roller pairs (12, ...) corrects the work W by clamping the workpiece W at a predetermined pressure from the thickness direction and simultaneously conveys the workpiece W with a predetermined pressure from the width direction. It consists of a pair of left and right calibration rollers to be conveyed at the same time. As the up-and-down calibration roller pair, two sets of first up and down calibration roller pairs 12 and 13, two sets of two up and down calibration roller pairs 14 and 15, and a third up and down calibration roller pair of two sets (16, 17) are arranged.

Rails for Linear Bearings, High Frequency Heat Treatment Equipment, Straightening Rollers, Induction Heating Coils, Conveying

Description

High frequency heat treatment method and high frequency heat treatment device {METHOD AND APPARATUS FOR INDUCTION HEAT TREATMENT}

1 is a perspective view showing a workpiece to which the high frequency heat treatment of the present invention proceeds;

2 is a plan view showing a schematic configuration of a high frequency heat treatment apparatus of the present invention;

3 is a side view illustrating the high frequency heat treatment apparatus of FIG. 2.

[Description of Drawing Reference]

10 ... high frequency heat treatment device

12,13 ... 1st vertical calibration roller pair 14,15 ... 2nd vertical calibration roller pair

16,17 ... 3rd vertical calibration roller pair 22,23 ... 1st left and right calibration roller pair

24,25 ... 2nd left and right calibration roller pair 26,27 ... 3rd left and right calibration roller pair

30 ... induction heating coils for quenching 32 ... chillers

34 ... induction heating coil W ... work

W2 ... work home

The present invention relates to a high frequency heat treatment method and a high frequency heat treatment apparatus for high frequency heat treatment of a groove of a rail for a linear motion bearing having grooves formed in a widthwise side surface portion.

Linear motion rolling bearings are widely used by combining a rail and a block for linear motion bearings extending in a predetermined long direction and linearly moving the blocks. The groove | channel in which the hole of a block slides is formed in the width direction (direction orthogonal to a longitudinal direction) of the rail for linear motion bearings. The block is guided to the rail for linear motion bearings so that the hole repeatedly slides in the groove when linearly moving in the long direction. For this purpose, the groove of the rail for linear motion bearings is usually hardened and hardened.

When the grooves of the rail for linear motion bearing rails are quenched, the grooves are heated to the hardening temperature with an induction heating coil and quenched. Then, the rails for linear motion bearings are charged into an electric furnace and the hardened groove is considered as an electric furnace. Further, after the above described, the curvature of the rail for linear motion bearings is measured to correct the curvature.

However, as described above, a hardening process using an induction heating coil, a soaking process using an electric furnace, and a calibration process for correcting the curvature after bending are required when the grooves of the rail for linear motion bearings are hardened by hardening. For this purpose, a moving time for moving the rail for linear motion bearings from the hardening step to the thinning step is required, and the moving head has become a loss time. In addition, since the curvature is corrected after being considered, the curvature by curving and curvature by curvature are corrected at once by the calibration process. Therefore, the amount of curvature is large and requires a long time for correction. In addition, when the curvature correction is performed because the temperature of the linear motion rolling rail becomes 40 ° C. or lower after the soaking step, the cured linear motion rolling rail must be calibrated, and the calibration takes longer.

It is an object of the present invention to provide a high frequency heat treatment method and a high frequency heat treatment apparatus capable of reducing the deformation of the rail for linear motion bearings after being quenched to solve the above-mentioned conventional problems.

In the high frequency heat treatment method of the present invention, in order to achieve the above object, in the high frequency heat treatment method of high frequency heat treatment of the groove of the rail for direct-driving bearings extending in a predetermined conveyance direction and at the same time a groove is formed in the widthwise side surface portion,

(1) conveying the rail for linear motion bearings while calibrating in the thickness direction to induction heating the groove to a predetermined quenching temperature and cooling immediately after the induction heating;

(2) conveying the cooled linear motion rolling rail while correcting it in the thickness direction, and induction heating the linear motion rolling rail to a predetermined consideration temperature,

(3) The said linear motion rolling guide rail is conveyed, calibrating from the said thickness direction, It is characterized by the above-mentioned.

And

(4) It is also preferable to convey, carrying out correction also in the said width direction, when conveying, correct | amending while correcting the said rail for linear motion bearings from the said thickness direction.

In addition, in order to achieve the above object, the high frequency heat treatment apparatus of the present invention is a high frequency heat treatment apparatus which extends in a predetermined conveying direction and simultaneously carries the high frequency heat treatment of the groove while conveying the linear bearing rail having grooves formed in the widthwise side portion in the conveying direction. ,

(5) a first up-and-down straightening roller pair for conveying in the conveying direction while calibrating the rail for linear motion bearing with a predetermined pressure from the thickness direction;

(6) a quenching induction heating coil disposed downstream of the conveyance direction than the first up-down straightening roller pair and heating the groove to a predetermined quenching temperature;

(7) a cooler for cooling the groove heated to the quenching temperature with the quenching induction heating coil;

(8) a second upper and lower straightening roller pair disposed downstream of the conveying direction than the cooler conveying in the conveying direction while correcting the rail for the linear motion bearing at a predetermined pressure from the thickness direction;

(9) a sourcing induction heating coil which heats the groove arranged at a downstream side in the conveying direction than the second up / down straightening roller pair to a predetermined temperature;

(10) a third up-and-down straightening roller pair disposed below the conveying direction downstream from the sourcing induction coil conveying in the conveying direction while calibrating the coil for linear motion bearing at a predetermined pressure from the thickness direction; Characterized in having a.

And,

(11) first left and right straightening roller pairs for correcting a portion of the linear rail for rails fitted by the first vertical straightening roller pair at a predetermined pressure from the width direction;

(12) a second left and right straightening roller pair for correcting by sandwiching a portion of the rail for linear motion bearing by the second top and bottom straightening roller pair at a predetermined pressure from the width direction;

(13) a third left and right straightening roller pair for correcting by sandwiching a portion of the rail for the linear motion bearing by the third top and bottom straightening roller pair at a predetermined pressure from the width direction; It is also preferable to have.

Hereinafter, the most preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. . Other objects, features, and operational advantages, including the object, operation, and effect of the present invention will become more apparent from the description of the preferred embodiment.

The present invention is realized by the high frequency heat treatment of a rail for linear motion rolling bearings extending in a predetermined conveyance direction and grooves formed in the side surfaces in the width direction.

1 to 3, the present invention will be described.

1 is a perspective view showing a workpiece on which the high frequency heat treatment of the present invention is carried out. 2 is a plan view showing a schematic configuration of a high frequency heat treatment apparatus of the present invention. 3 is a side view illustrating the high frequency heat treatment apparatus of FIG. 2. In FIG. 2, the upper and lower correction roller pairs are omitted, and in FIG. 3, the left and right correction roller pairs are omitted.

The high frequency heat treatment apparatus 10 is for hardening the groove W2 of the rail W (hereinafter referred to as work W) of linear bearings made of water bearing steel. Hardening the groove W2 means hardening the inner wall surface of the groove W2. The workpiece W extends in a predetermined conveying direction (arrow A direction) and is provided with a groove W2 in the side surface W1 in the width direction (arrow B direction). The groove W2 is formed in a substantially central portion in the thickness direction (arrow t direction) and extends in the direction of the arrow A in the widthwise side surface W1. The workpiece | work W is conveyed in the state which provided the upper surface W3 in which the groove | channel W2 was not formed facing upward, and made the width direction side part W1 toward the side direction.

The high frequency heat treatment apparatus 10 is a quenching induction heating coil for heating a plurality of calibration roller pairs 12, 13,... 22, 23,... 30, a cooler 32 for injecting a coolant into the groove W2, and a sourcing induction heating coil 34 for reducing the groove W2. A plurality of calibration roller pairs 12, 13 ... consists of left and right calibration roller pairs for correcting and simultaneously conveying the workpiece W at a predetermined pressure from the thickness direction (up and down direction). As the up-and-down calibration roller pair, two sets of first up and down calibration roller pairs 12 and 13, two sets of two up and down calibration roller pairs 14 and 15, and two sets of three up and down calibration roller pairs sequentially from the upstream side of the conveying direction. (16, 17) are arranged. In addition, as a left-right straightening roller pair, the 1st left-right straightening roller pair 24 and 25 which inserts and corrects the part corrected and inserted by 2 sets of 1st top and bottom straightening roller pairs 12 and 13 of the workpiece | work W at the predetermined pressure from the width direction. ) And the third left and right straightening roller pairs 26 and 27 for correcting by inserting and correcting the portion to be inserted and corrected by the pair of third upper and lower straightening roller pairs 16 and 17 of the work W at a predetermined pressure from the width direction. do. Although two sets are used here, it is also preferable to arrange three or more sets of correction rollers.

The calibration roller pairs 12, 22 ... are horizontally positioned so that the workpiece W during conveyance is not bent or undulated. To this end, for example, the two rotary shafts 12a and 12b of the first vertical calibration roller pair 12 are fixed to the main body of the high frequency heat treatment apparatus 10 by inserting an axis number (not shown). The same is true for other Laura pairs. In addition, one of the two rotating shafts (12a, 12b) is fixed, but the other side is preferably arranged to move somewhat, such as a spring or cylinder, and the same for the other roller pair.

The groove W2 of the workpiece W is heated to a predetermined quenching temperature on the downstream side in the conveying direction than the first upper and lower straightening roller pairs 12 and 13 (which is also the same in the conveying direction downstream than the first left and right straightening roller pairs 22 and 23). Hardening induction heating coil 30 is disposed. The cooler 32 which sprays coolant by inject | pouring a coolant to the groove | channel W2 heated to predetermined | prescribed quenching temperature is arrange | positioned rather than the said induction heating coil 30 for quenching is arrange | positioned. The hardening induction heating coil 30 and the cooler 32 are arrange | positioned rather than the 2nd up-and-down straightening roller pair 14,15 upstream.

Lesser induction heating coils 34 for heating the grooves W2 of the workpiece W to a predetermined lower temperature than the second vertical straight roller pairs 14 and 15 are disposed. Further, third up-down calibration roller pairs 16 and 17 are disposed on the downstream side of the conveyance direction rather than the induction heating coil 34 for the purpose.

An embodiment in which the work W is processed using the high frequency heat treatment apparatus 10 having the above-described configuration will be described.

In the high frequency heat treatment apparatus 10, the workpiece | work W in which the force of the process which is pulled out by cold processing remain, for example is heat-processed. When the workpiece W in which the processing stress remains is heated to the quenching temperature, the workpiece W may be bent or wave deformed by releasing the processing stress. In addition, deformation of the work W may occur due to quenching. Such deformation occurs in the vertical direction and in the left and right directions.

In the high frequency heat treatment apparatus 10, a plurality of calibration roller pairs 12 and 22 are disposed before and after (in the conveying direction upstream and downstream) the quenching induction heating coil 30, the cooler 32, and the sourcing induction heating coil 34. Since the work W deforms during heat treatment, the deformation is corrected by the calibration rollers 12, 22, .... Therefore, there is almost no deformation in the workpiece | work W after finish of the soaking.

As described above, according to the present invention, since the rail for linear motion bearings during heat treatment is calibrated by each calibration roller pair, it is possible to reduce deformation such as bending or wave.

For reference, the specific embodiments of the present invention are only presented by selecting the most preferred embodiments to help those skilled in the art from the various possible examples, and the technical spirit of the present invention is not necessarily limited or limited only by the embodiments. In addition, various changes, additions and changes are possible within the scope without departing from the spirit of the present invention, as well as other embodiments that are equally apparent.

Claims (4)

In the high frequency heat treatment method for high frequency heat treatment of the groove of the rail for linear motion rolling extending in a predetermined conveyance direction and at the same time a groove is formed in the width side surface portion, The linear bearing rail is conveyed while being calibrated in the thickness direction to induction heating the groove to a predetermined quenching temperature and to cool immediately after the induction heating. The cooled linear rail bearings are transported while being corrected in the thickness direction, and the linear rail bearings are inductively heated to a predetermined temperature for consideration. A high frequency heat treatment method characterized by conveying the said linear motion rolling rail while correcting from the said thickness direction. The method of claim 1, A high frequency heat treatment method characterized in that the linear direct bearing rail is conveyed while being corrected from the thickness direction while being corrected from the thickness direction. In the high frequency heat treatment apparatus for performing a high frequency heat treatment of the groove while conveying in the conveying direction the rail for linear motion rolling which extends in a predetermined conveying direction and at the same time has a groove formed in the widthwise side surface portion. A first up-and-down straightening roller pair for conveying in the conveying direction while calibrating the rail for linear motion bearing at a predetermined pressure from the thickness direction; A quenching induction heating coil arranged downstream of said conveying direction than said first up-down straightening roller pair and heating said groove to a predetermined quenching temperature; A cooler configured to cool the groove heated to the quenching temperature by the quenching induction heating coil; A second up-and-down straightening roller pair disposed downstream of said conveying direction than said cooler conveying in said conveying direction, while correcting said linear bearing rail with said predetermined pressure from said thickness direction; A sourcing induction heating coil for heating the groove arranged at the downstream side in the conveying direction than the second up / down straightening roller pair to a predetermined soaking temperature; A third up-and-down straightening roller pair disposed downstream of said conveying direction than said sourcing induction coil which conveys in said conveying direction, while calibrating said linear motion bearing coil with said predetermined pressure from said thickness direction; High frequency heat treatment apparatus comprising a. The method of claim 3, First left and right straightening roller pairs for correcting by inserting a portion fitted by the first vertical straightening roller pair among the rails for linear motion at a predetermined pressure from the width direction; A second left and right straightening roller pair for correcting by inserting a portion fitted by said second up and down straightening roller pair among said rails for linear motion at a predetermined pressure from said width direction; A third left and right straightening roller pair for correcting by inserting a portion fitted by said third upper and lower straightening roller pair among the rails for linear motion at a predetermined pressure from the width direction; High frequency heat treatment apparatus comprising a.

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