JP3322681B2 - Jig for heat treatment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for heat treatment for accommodating an object to be treated and performing heat treatment, and more particularly to a jig for heat treatment for accommodating the object in an upright state.

[0002]

2. Description of the Related Art Conventionally, when performing heat treatment such as quenching and tempering, a plurality of objects to be processed are housed in a heat treatment jig and subjected to heat treatment and cooling treatment. Here, in the case of rod-shaped or cylindrical workpieces such as spools, piston rods, cylinders, etc., in which the deviation of the axis is severely restricted, when the workpiece is softened by heating, the axis is deformed by its own weight. May be accompanied. In order to prevent this deformation, as shown in FIG. 7, a lower net 5 for placing an object to be processed on the lower frame 2 of the case 1 and a plurality of upper small frames 6 for inserting the object to be processed into the upper frame 4. A jig for heat treatment having a case is used. Each object to be processed is stored in the upper small frame 6 in a vertically standing state and is charged into a heating furnace.

[0003]

However, in this conventional heat treatment jig, the object placed on the lower net 5 is supported by the upper small frame 6 to prevent the object from falling. For this reason, when the jig for heat treatment is tilted or vibrated when it is charged into or transferred to the heating furnace, the jig is horizontally moved on the lower net 5 as shown in FIG. There were times when it shifted and tilted. The processing object Wa heated in this inclined state is exposed to a high-temperature environment and softens,
Defects occur due to the deviation of the shaft center from its own weight. In addition, the workpiece Wa that has been laterally displaced and the workpiece Wb that is standing upright without laterally intersecting and contacting each other or have poor airflow, so that the workpieces Wa and Wb have different heating conditions. During quenching, sintering occurs to cause deformation of the shaft center, resulting in defective products. For example, in a workpiece for a spindle of a brake part of a passenger car which is formed into a cylindrical shape having a diameter of 10 mm and a length of 100 mm, the allowable strain amount of the shaft center is 0.1 mm, and in some cases, 0.015 mm. Since it was very severe as described below, it had a technical problem that the incidence of defective products was high.

[0004] Further, as shown in FIG.
An intermediate small frame 15 is provided between the upper frame 4 and the upper frame 4, and the workpiece W is held upright by these two locations to prevent lateral displacement. However, in the workpiece W having the small-diameter portion 10 in the middle, the lateral displacement can be sufficiently prevented unless the intermediate small frame 15 is adapted to the size and shape of the workpiece as shown by the dashed line in FIG. Therefore, a general-purpose heat treatment jig could not be obtained. Further, when the shape of the intermediate small frame 15 is matched with the small diameter portion 10 of the workpiece W, the intermediate small frame 15 is deformed by repeated use, and the workpiece W cannot be charged or can be correctly erected. become unable.
For this reason, it is necessary to repair or replace the intermediate small frame 15, and there has been a problem in long-term use.

In order to solve such a technical problem, the present invention aims to provide a heat treatment jig that can hold a workpiece so that it can always be erected without tilting and that can be used for a long time. Things.

[0006]

In order to solve this technical problem, according to the present invention, when charging a furnace,
For heat treatment with a case that can be stored upright
A jig, wherein the upper surface of the case has the object to be processed inserted thereinto
While being divided by a number of possible
The wire is spirally wound inside the wire and can be expanded and contracted by heat
The upper and lower ends of the spiral frame are fixed to the case.
It is arranged vertically by setting, and this spiral frame is
The object to be processed is arranged corresponding to the upper
It is characterized in that it can be stored and held upright inside through a frame .

[0007]

When the object to be processed is inserted from above the spiral frame, it is stored and held upright in the spiral frame. Even if the jig for heat treatment vibrates while moving in a heating furnace or the like, the object to be processed is held by the spiral frame, and is maintained in an upright state and does not tilt. Also,
Even if the heat treatment jig is used for a long time, the spiral frame expands and contracts with repeated heating and cooling. However, since the upper and lower sides of the spiral frame are formed in a spiral shape fixed by a case, the amount of expansion and contraction Is absorbed by the spiral frame and maintains its shape without deforming the entire spiral frame.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS.

As shown in FIGS. 1 and 2, a case 1 is supported on a lower frame 2 formed in a square shape by a stainless steel angle member by a column 3 standing from each corner of the lower frame 2. It is formed in a frame formed by the upper frame 4 having the substantially same shape. The lower frame 2 is provided with a lower net 5 made of stainless steel having a mesh smaller than the lower end surface of the workpiece W so that the workpiece W to be processed can be placed without falling down. I have. Further, the upper frame 4 is provided with a plurality of upper small frames 6 which are divided into substantially squares by a stainless steel wire in the process, and the workpieces W can be inserted one by one from the upper small frames 6. It is formed as follows. Further, the upper end of a spiral frame 8 in which a wire is formed in a spiral shape is fixed to each upper small frame 6 by welding. The lower end of each spiral frame 8 is fixed to the lower net 5 by welding, and the spiral frame 8 is vertically fixed. The diameter of each spiral frame 8 is formed so as to be inscribed in the upper small frame 6 partitioned into a square, so that a workpiece W that can be inserted into the upper small frame 6 can be loaded. The spiral frames 8 are fixed so as not to contact the adjacent spiral frames 8 and are provided so that the spiral frames 8 do not interfere with each other. In this embodiment, the spiral frame 8 is a spiral having an angle of about 40 °. In addition, handles 9 are provided on both sides of the upper frame 4 so that the case 1 can be easily carried.

Next, the operation of the heat treatment jig of this embodiment having such a configuration will be described.

Now, a description will be given of the case of processing the columnar workpiece W shown in FIG. 2. A plurality of workpieces W are stored in each spiral frame 8 in an upright state, and are placed in a heating furnace (not shown). Be charged. Then, the case 1 is sequentially pushed by a pusher and transported in the heating furnace. The case 1 vibrates during the transportation, and sometimes a sudden impact is applied. At this time, the workpiece W is prevented from hitting any part of the spiral frame 8 and being largely shifted laterally. Therefore, the upright state is maintained, and a large number of workpieces W are neatly stored in the heat treatment jig and held in a state. Also,
Since the workpieces W do not overlap with each other and the flowability is secured, the heating condition is constant, and the workpieces W are uniformly heated without bias. The axis X of the workpiece W is
Since the workpiece W is always upright, even if the workpiece W is softened by heating, the workpiece W is heated without being bent by its own weight. In addition, for example, during quenching, the workpiece W is immersed in oil or the like and rapidly cooled. However, since the workpiece W is heated without bias, distortion caused by rapid cooling occurs without bias and the axis X is curved. It is hard to produce a large distortion. For this reason, the heat treatment is performed without the axis X being bent due to the rapid cooling.

Further, the small-diameter portion 10 shown in FIG.
In the case of storing the workpiece W having the following, the lateral displacement can be prevented by the intermediate portion of the spiral frame 8. For this reason, while the intermediate small frame 15 shown in the conventional example of FIG. 8 cannot prevent the lateral displacement in the processing object W located in the small diameter portion, in this embodiment, the processing target having the small diameter portion has This is a highly versatile heat treatment jig that can process the object W.

As shown in FIG. 4, the spiral frame 8 of this embodiment has a spiral angle of about 40 °, so that the workpiece W having the protruding flange portion 11 is covered with a jig for heat treatment. When the processing object W is inverted and taken out, the processing object W is arranged at a position deviated to one side in the spiral frame 8, the flange portion 11 is brought into contact with the spiral frame 8 and guided, and while rotating slowly. Can be pulled down. In the heat treatment jig having no spiral frame 8 as shown in the conventional example, the brittle portion 11 which has become brittle due to burning may hit the upper small frame 6 and the corner of the flange portion 11 may be chipped. However, occurrence of such defective products can be prevented.

In the heat treatment jig of this embodiment, the workpiece W is placed on the lower net 5, so that uniform heating with good air flow to the lower end of the workpiece W is possible. Have been.

In this embodiment, the lower frame 2 of the case 1 is used.
And the upper frame 4 has a rectangular shape, but the shapes of the lower frame 2 and the upper frame 4 are, for example, as shown in FIG.
The present invention can be implemented without being limited to the shape of the case 1.

Also, an example in which the upper small frame 6 is formed into a rectangular shape by a wire is shown, but as shown in FIG.
The fixing means may be appropriately adopted without being limited to welding.

Further, in this embodiment, an example in which the objects to be processed are arranged in one stage has been described. However, the present invention can also be implemented as a case where the columns 3 can be stacked in multiple stages by connecting them up and down. .

In this embodiment, the workpiece W is placed on the lower net 5. However, the lower portion of the spiral frame 8 may have a small diameter so that it can be placed in the spiral frame.

[0019]

According to the present invention, the upper and lower sides of a spiral frame in which a wire is formed in a spiral shape are fixed to a case, and the object to be processed can be stored in the spiral frame. Thus, a heat treatment jig that can be held so as to be always standing upright and can be used for a long time can be provided.

[Brief description of the drawings]

FIG. 1 is a partial perspective view.

FIG. 2 is a partial cross-sectional view.

FIG. 3 is a partial cross-sectional view showing a state where an object to be processed having a small diameter portion is loaded.

FIG. 4 is a partial cross-sectional view showing a state in which an object to be processed having a flange portion is inverted and taken out.

FIG. 5 is a perspective view showing another embodiment.

FIG. 6 is a partial plan view showing another embodiment.

FIG. 7 is a partial cross-sectional view showing a conventional example.

FIG. 8 is a partial cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 ... case, 8 ... spiral frame W ... workpiece

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 1-1110249 (JP, U) JP-A 51-25608 (JP, U) JP-63-6194 (JP, Y2) JP-43 22256 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) C21D 1/00 F27D 3/12

Claims (1)

(57) [Claims] 1. An object to be treated is charged into a heating furnace.
A heat treatment jig with a case that can be stored upright
The upper surface of the case has a plurality of upper surfaces on which the object can be inserted.
While being divided by a small frame, a wire rod is
Multiple spirally wound and heat-expandable
The upper and lower ends of the spiral frame are fixed to the case,
The spiral frame is aligned with the upper small frame.
The workpiece is arranged in response to the inside through the upper small frame.
A heat treatment jig characterized in that it can be stored and held upright .