JPH0114285B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a restraint hardening device for rod-shaped bodies. When hardening a rod-shaped object such as a torsion bar, if it is treated in a free state, it is likely to be deformed during heating and hardening, so in order to maintain the product quality at the desired level, cold hardening is necessary. A straightening process is essential. In order to solve these problems, a rolling press hardening machine has conventionally been used which hardens a round bar-shaped object to be hardened while rotating and pressurizing it. This device is provided with a pedestal 2 provided in a quenching fluid 1 as illustrated in FIGS. 1 and 2. One end of this frame 2 is swingably supported via a horizontal shaft 3, and a drive wheel 4 provided at the other end is supported via a link 5 eccentrically connected to the drive wheel 4. It is configured to perform rocking motion by being rotationally driven by a power source 6. The mount 2 has a lower roller 7 and an upper roller 8 for rotationally pressurizing the torsion bar a.
The lower roller 7 is driven to rotate at a predetermined speed by a power source 9, and the upper roller 8 is rotated by a cylinder device 10.
It is supported so that it can be moved in and out of the way. In addition, the transport device 1
1 is a V for supporting the torsion bar a on the upper surface.
A main body 13 in which a character-shaped groove 12 is formed, and this main body 1
The main body 13 is provided with driving wheels 14 that support both front and rear ends of the main body 13.
By making a circular motion, the torsion bar a is sequentially moved forward. In the conventional device configured as described above,
Since the torsion bar a is rotated and pressed by the upper and lower rollers 8 and 7, impressions are likely to occur. Furthermore, the structure and operation of the device are complex, requiring troublesome handling and maintenance. Furthermore, since it is inconvenient to adjust the positions of the rollers 7, 8, etc., it takes time to set up when changing product types, making it unsuitable for high-mix, low-volume production. Also, the quenching tact is slow. Moreover, as will be described later (see FIG. 7), there is a problem in that deformation caused by heat treatment cannot be sufficiently prevented. The present invention has been made under the above circumstances, and its purpose is to provide a rod-shaped product which has a simpler structure and is easier to handle than the above-mentioned conventional devices, and which can significantly improve the quality level. The purpose of the present invention is to provide a restrained hardening device. Hereinafter, the present invention will be described with reference to an illustrated embodiment. In FIGS. 3 to 6, a fixing member 12 is provided above a liquid tank 11 containing a quenching fluid 10. As shown in FIGS. The movable member 13 includes a column 14 that vertically slides through the fixed member 12, and an upper frame 15 and a lower frame 16 attached to both upper and lower ends of the column 14. The movable member 13 is configured to be driven up and down by a cylinder device 17 interposed between the upper frame 15 and the fixed member 12. The fixed member 12 and the movable member 13 are provided with an upper support member 18 and a lower support member 19, respectively, which extend in the front-rear direction. These support members 18 and 19 are arranged in plurality (each 10 in the figure), facing each other in the vertical direction and arranged at intervals in the front-rear direction.
) upper support part 20 and lower support part 21
It is equipped with These support parts 20 and 21 are
A planar shape with mutually opposing parts facing downward and a V-shape facing upward so that a rod-shaped body a such as a torsion bar can be held between the two (the angle of the V groove is preferably about 60 degrees).
, and these mutually opposing portions are immersed in the quenching liquid 10. Further, the lower support member 19 is provided with protrusions 22 that connect with each rear end portion of the lower support portion 21, and the upper end surfaces 23 of these protrusions 22 are inclined downward at the front side. Furthermore, the lower support member 19 is provided with a plurality of arm parts 24 located at the rear end and rising upward, and a plurality of arm parts 24 located at the front end and extending upward and forward in a step-like manner (the figure shows seven arm parts). ) step part 2
5 is provided. The upper end portion 26 of the arm portion 24 is formed in an arc shape with an axis extending in the lateral direction. Stepped section 2
5 is formed so that the front side is inclined downward. The upper end portion 26 of the arm portion 24 and the step portion 25 located at the frontmost portion are configured to protrude above the surface of the quenching fluid 10 when the movable member 13 is in the raised position. In addition, in the illustrated example, the rearmost lower support portion 2
A recess 27 is provided at the rear of 1. In addition, the upper support member 18 and the lower support member 19 are each divided into a plurality of parts (in the case of three in the figure) in the horizontal direction, and the parts arranged on both sides are configured so that the horizontal position can be variably set. Although the upper support part 20 and the lower support part 21 are each divided in the horizontal direction into a plurality of parts (in the case of seven parts in the figure), the present invention is not limited to this. A pair of conveying members 30 are integrally connected to the fixing member 12 and extend in parallel to each other in the front-rear direction. The conveying member 30 includes a serrated portion 31 located between the upper limit height and the lower limit height of the lower support portion 21 and extending in the front-rear direction, and an upper limit height and a lower limit of the upper end portion 26 of the arm portion 24. an inclined portion 32 located midway between the height and connected to the rear end of the sawtooth portion 31; and a sloped portion 32 located midway between the upper and lower limit heights of the stepped portion 25 and connected to the front end of the sawtooth portion 31. A stepped portion 33 is provided. The sawtooth portion 31 faces the hoistway of the lower support portion 21 and includes a plurality of tooth portions 34 (10 in the figure) whose front side is gently inclined downward. The inclined portion 32 is formed so that the front side thereof is inclined downward. Incidentally, a protrusion 35 is formed on the inclined portion 32 and is located slightly rearward of the hoistway of the recessed portion 27 of the lower support member 19 and protrudes upward. The stepped portion 33 has a plurality of stepped portions 36 facing the hoistway at the rear end of each stepped portion 25 and whose upper surface slopes forward, and a stopper 37 protruding upward at the front end. It is provided. Inside the liquid tank 11, quenching liquid ejection pipes 40 are provided which are located on both sides and extend in the front-rear direction. This spout pipe 40 spouts quenching fluid along the longitudinal direction of the rod-shaped body a, and agitates the quenching oil in the liquid tank 11 so that the rod-shaped body a can be uniformly quenched. There is. Next, the operation of the apparatus configured as described above will be explained. The movable member 13 is controlled to move up and down according to a desired program by driving and controlling the cylinder device 17 through an appropriate control means (not shown). Although it is possible to set the time required for one lifting/lowering operation to about 4 seconds, it is usually better to set it to about 8 seconds. The rod-shaped body a heated to a predetermined temperature moves the movable member 13 up and down against the upper end 26 of the arm 24 in the lower support member 19 when the movable member 13 is in the raised position as shown in FIG. They are placed one by one via appropriate interlocking loading means. The rod-shaped body a supported by the arm part 24 in this way is moved to the inclined part 3 of the conveying member 30 during the lowering process of the movable member 13.
2, moves forward while descending along the slope 32 due to the action of gravity, and comes into contact with the protrusion 35 and stops (FIG. 5). Then, 2 of the movable member 13
In the second ascending process, it is again moved to the lower support member 19, supported by the recess 27 and elevated (Fig. 6), and then in the second descending process, it is moved again to the inclined part 32 of the conveying member 30, and the sawtooth It comes into contact with the rear end of the first tooth portion 34 from the rear of the shaped portion 31 and stops. Furthermore, as the movable member 13 is moved along the upper surface 23 of the protrusion 22 during the third ascending process, the first lower support part 21 from the rear
when the upper support part 2 reaches the raised position.
It is held between 0 and 0. In the third descending process, it is moved by the conveying member 30 and comes into contact with the rear end portion of the second tooth portion 34 from the rear of the sawtooth portion 31 .
Thereafter, in the same manner, as the movable member 13 moves up and down, it is alternately transferred between the lower support member 19 and the conveyance member 30, and is moved forward by one step each time. Then, in the 13th descending process, the rod-shaped body a moved to the front end of the serrated part 31 is moved to the step part 25 of the lower support member 19 as the movable member 13 moves up and down in substantially the same manner as described above.
and the stepped portion 36 of the stepped portion 33 in the conveying member 30
The transport member 3 is transferred alternately between the two and moved one step each time, and at the 20th rise, the transport member 3
0 reaches the step 36 at the frontmost part of the stopper 37.
It is in contact with. Then, it is carried out to the outside by an appropriate carrying-out means (not shown) that is interlocked with the vertical movement of the movable member 13. The above operations are performed in the same way for each rod-shaped body carried in via the carrying means. According to the above configuration, it is possible to alternately restrain and transport the rod-shaped body a by simply driving the movable member 13 up and down, and the structure is significantly simplified compared to the conventional device, and the handling is easy. becomes much easier. Moreover, since the upper support part 20 is formed flat and the lower support part 21 is formed in a V-shape, it can be used as is even if the outer diameter of the rod-shaped body varies within a range of, for example, 18 to 30 mm. , and upper and lower support parts 2 disposed on both sides.
Since the lateral positions of 0 and 21 can be variably set, it is possible to easily deal with variations in the length of the rod-shaped body, and the setup work is greatly simplified. Moreover, since the mutually sliding portion between the fixed member 12 and the movable member 13 is located above the surface of the quenching fluid 10, and the conveying member 30 remains fixed, the smooth movement due to scale etc. in the fluid is prevented. It does not impede movement. Further, during the period from when the rod-shaped body a is immersed in the quenching liquid 10 to when it is restrained for the first time, the lower support member 1
Since the transfer is made twice between the scale 9 and the conveying member 30, approximately 10 seconds pass during this time, and the scale is It is possible to effectively prevent scratches and impressions caused by biting. Moreover, since the rod-shaped body a is intermittently restrained by the upper support part 20 and the lower support part 21 in the temperature range where martensitic transformation occurs (350 to 150 degrees Celsius), occurrence of thermal deformation can be effectively prevented. Can be done. Specifically, Example A (outer diameter 22 mm, length 822 mm) was hardened using the apparatus of the present invention configured as described above, and Comparative Example B (outer diameter 21.6 mm, length 822 mm) was hardened using the conventional apparatus described above. Deflection (+3σ) at each stage after quenching of Comparative Example C (outer diameter 21.9 mm, length 830 mm) quenched in an unrestrained state (length 967 mm)
The changes in are as shown in the table below and Figure 7,
Comparative Examples B and C exceeded the standard value (3 mm) at all stages except for the straightening process, whereas Example A was always below the standard value. In addition, the stages are after quenching, after tempering,
indicates after preliminary straightening in case of unrestricted hardening, shows after shot peening, shows after setting, and shows after final straightening in case of unrestricted hardening.

[Table] In addition, the durability is shown in Figure 8 as stress amplitude τ (Kg/mm ² ).
As shown in the relationship between N and the number of repetitions, in the case of unrestrained quenching (average stress 40 to 52.5 Kg/mm ² ), the characteristics corresponding to the fracture probability of 10%, average μ^ and 95%, respectively. In contrast, when quenched using the device of the present invention (average stress
45Kg/mm ² ), the properties corresponding to a failure probability of 20% are significantly superior as shown by the solid line a. It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, the arrangement of the upper support part 20, the lower support part 21, the conveyance member 30, etc. in the lateral direction may vary depending on the shape and dimensions of the rod-shaped body a. You may design it as appropriate. Further, a recess 27 provided on the movable member 13 and a protrusion 35 provided on the conveying member 30
The necessity, number, etc. of
The necessity of the inclined portion 32, stepped portion 33, etc. at 0 may be set as appropriate. Furthermore, the upper support part 2
0 and the lower support portion 21 in the front-rear direction, the arrangement pitch, etc. may be set as appropriate. In addition, various modifications and applications are possible within the scope of the gist of the present invention. As described above, the present invention has a plurality of lower support parts disposed in the front and rear direction so as to be able to sequentially support a rod-shaped body that is heated to a predetermined temperature, extends in the lateral direction, and is transferred forward. a movable member that is driven up and down while holding the lower support portion; a plurality of protrusions located on the rear side of the lower support portion and provided on the movable member and having upper end surfaces inclined downward and forward;
a fixed member having a plurality of upper support parts immersed in a quenching liquid so as to be able to sandwich the rod-shaped body between the movable member and the lower support part when the movable member is in the raised position;
A conveying member is provided facing each hoistway of the lower support part in the front-rear direction, has a plurality of tooth parts whose upper surface is inclined downwardly and forwardly, and is integrally connected to the fixing member. The present invention is characterized in that the rod-like body is moved forward in alternating association with the protrusions and teeth as the movable member moves up and down. Therefore, by driving the movable member up and down, the bar-shaped body can be sequentially transferred and intermittently restrained and hardened, resulting in a simple structure, easy handling, and improved maintainability and durability. In addition to being excellent in performance, setup work can be simplified. Moreover, since the occurrence of quenching deformation in the rod-shaped body can be effectively prevented, there is no need to provide a straightening process, and when applied to a torsion bar or the like, the durability can be greatly improved.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams showing a conventional example, FIG. 3 is a cutaway front view showing an embodiment of the present invention, and FIG.
Figures 5 and 5 are cross-sectional views taken along lines - and - in Figure 3, Figure 6 is a cross-sectional view showing a different state from Figure 5, and Figure 7 is a comparison of deflection in each process after quenching. FIG. 8 is a diagram illustrating durability. 10...Quenching liquid, 12...Fixing member, 13...
Movable member, 17...Cylinder device, 20...Upper support part, 21...Lower support part, 22...Protrusion, 2
3... Upper end surface, 30... Movable member, 31... Serrated portion, 34... Teeth portion.

Claims (1)

[Claims] 1. A device having a plurality of lower support portions disposed in the front-rear direction so as to be able to sequentially support a rod-shaped body that is heated to a predetermined temperature, extends in the lateral direction, and is transferred forward, in which the lower support portion is a movable member that is held and driven up and down; a plurality of protrusions that are located on the rear side of the lower support portion and are provided on the movable member and whose upper end surfaces are inclined downward and forward; a fixing member having a plurality of upper support parts immersed in a quenching liquid so as to be able to sandwich the rod-shaped body between the lower support part; a conveyance member integrally connected to the fixed member, the rod-shaped body being disposed on the protrusion, and having a plurality of teeth whose upper surface is inclined downwardly and forwardly, and integrally connected to the fixed member; A restraint hardening device for a rod-shaped body, characterized in that the rod-shaped body is conveyed forward while being alternately linked with the teeth.