JPS6020106B2 - Hot ring rolling mill equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a main roller that is rotatably attached to a bed and driven to rotate, and a mandrel that is rotatably attached to a main body that is movably assembled to the bed. , Improvement of hot ring rolling mill equipment that produces a large diameter and thin walled product by passing a heated small diameter thick annular material through a mandrel on the inner side and contacting and pressurizing the outer side with a rotating main roller. Regarding.

In this type of hot ring rolling mill equipment, the mandrel and main roller are heated by the heat of the annular material (workpiece, e.g. automobile differential ring gear) during processing, so the mandrel and main roller are usually The main roller is cooled by spraying cooling water from outside using a cooling water injection device to prevent damage to the mandrel and main roller due to heat and maintain machining accuracy.

However, in this type of thermal ring rolling mill device, even if the main roller that contacts the outer side of the material can be made as large as desired, the mandrel that contacts the inner side of the material is cannot be made larger,
Compared to the main roller, the mandrel is easily heated to a high temperature, which can exceed 600q0. Therefore, when cooling with a small amount of cooling water, the cooling time can be shortened and the operating rate of the device can be increased, and even if the main roller can be sufficiently cooled, the mandrel can be If the product is not cooled sufficiently, it may not be possible to properly prevent damage due to heat or maintain machining accuracy.
Quality defects such as scratches and missing parts often occur. On the other hand, if a large amount of cooling water is used to cool the main roller and mandrel, both the main roller and mandrel can be cooled.
The cooling time becomes longer and the operating rate decreases. Therefore, it is desirable to be able to cool the mandrel during processing.

It is also desirable that the mandrel be replaceable, as it is susceptible to heat damage. The present invention has been made in view of such demands, and one embodiment thereof will be described below based on the drawings.

Figure 1 shows a hot ring rolling mill device 1 that uses heated gear material (hereinafter referred to as work) Wo as an intermediate product of gear.
00 is shown. In this hot ring rolling mill device 10, a main roller 20 is installed horizontally and rotatably at the upper center of the bed 10 (see Fig. 2 for details). A pair of slide tables 30, 30 are arranged. The main roller 20G is rotationally driven by an electric motor (not shown), and has vertically symmetrical annular grooves 20a, 20a formed on its outer periphery so that it can be used upside down. Each slide table 30 has a bed 1
It is mounted on the main roller 20 so that it can move forward and backward (move left and right) toward the main roller 20, and is moved forward and backward by a hydraulic cylinder 31.
It is set to be pushed back. Each slide table 30
A column 40 is vertically installed on the column 40', and a workpiece unloading device 50 is roughly attached to the column 40'.
The slide table 3 is assembled so that it can move forward and backward (up and down). Each main shaft body 60 is a hydraulic cylinder 6
1, and a pair of guide rollers 62 (only one shown in the figure) rotates at the bottom to guide the movement of the workpiece Wo on the slide table 30 during processing. As well as being able to be assembled,
A mandrel 70 is rotatably attached in a suspended state. The position of each slide table 30 at the forward end is determined by each stopper mechanism 32 provided on the bed 1, and the position of each spindle main body 60 at the forward end is determined by a stopper mechanism 32 provided at each slide table 30. This is done by using a stopper that does not. In the hot ring rolling mill device I00' having such a mechanism, the main roller 2
0 is rotated by an electric motor, each heated workpiece Wo is automatically carried onto each slide table 30 as shown in the figure by a carrying device (not shown), and each slide table table 30 is rotated by an electric motor.
is advanced toward the main roller 20 with each hydraulic cylinder 31, and each main spindle body 60, guide roller 62, and mandrel 70 are advanced toward each slide table 3 with each hydraulic cylinder 61. The middle part 71 of each mandrel 70 is brought into contact with the inner side of the workpiece Wo, and the outer side of each workpiece Wo is brought into contact with and pressurized by the main roller 201.
Each small-diameter, thick-walled workpiece Wo can be made into a large-diameter, thin-walled intermediate product (semi-finished product).

In this case, the left and right works Wo can be made into intermediate products alternately or simultaneously. After each slide table 30, each spindle main body 60, guide roller 62, and mandrel 70 return to their original positions shown in the figure, the intermediate product is automatically transported from each workpiece unloading device 501 and each slide table 30. It will be done. Thereafter, the main roller 20 and each mandrel 7 stream are sprayed with cooling water from an unillustrated cooling water injection device from the outside. In this hot ring rolling mill apparatus 100, as shown in FIGS. 2 and 3, a hole 72 that closes at the lower end is bored in the axis of the mandrel 70, and this hole 72 A hole 73 that passes through the upper end of the mandrel 70 and closes at the outer periphery of the tapered part of the mandrel 70 is bored in the upper part of the mandrel 70, and a water channel P7 is formed inside the mandrel 70.

is formed. In addition, in waterway P7o, during processing,
Cooling water flows through a water channel P formed in the spindle 81, which is a component of the support device 80 for the mandrel 70, and a water channel P63 formed in the cover 63 (fixed to the upper end of the main shaft body 60 together with the seal holder 64). configured to be supplied. By the way, the water passage P is formed by a hole and an annular groove provided in the cover 63, and a pair of annular seal members S. , S2, and by simply connecting a cooling water supply pipe to a mounting hole provided in the cover 63, the cooling water can be guided to the water passage P8 of the rotating spindle 81. Note that the cooling water leaking from the lower annular seal member S2 is prevented from flowing downward by the annular seal member 63 iron-bonded to the seal holder 64.
The water is returned to a cooling water tank (not shown) through a drain port 64a provided at 4. This hot ring. The ring mill apparatus 1001 is configured as described above to form a waterway P7o inside the mandrel 70, and cooling water flows through this waterway P7o, so that the mandrel 70 can be cooled even during processing. The main roller 2 can be
0 and each mandrel 70 can be sufficiently cooled, and damage caused by heat can be prevented and machining accuracy can be properly maintained. Furthermore, by reducing the amount of cooling water from the cooling water injection device, the cooling time (cooling water injection time) can be shortened, and the operating rate of the rolling mill device 100 can be increased. Moreover, in this hot ring rolling mill apparatus 100, as shown in FIG.
A support device 80 for the mandrel 70 includes a main shaft body 601, a cylindrical spindle 81 rotatably assembled via bearings 82, 82, etc., and a sleeve immovably fixed to the stepped portion of the inner hole of the spindle 81. 83, a stepped rod 84 inserted into the stepped inner hole of this sleeve 83 so as to be movable only in the vertical direction, and a stepped rod 84 inserted into the mounting hole provided in the lower end cylindrical portion of this stepped rod 84 to the left in the figure. A movably attached pole 85, a nut 86 screwed onto the threaded portion of the upper end of the stepped rod 84, and a threaded rod 84, nut 86, etc. that is inserted between the nut 86 and the sleeve 83 to attach the stepped rod 84 and the nut 86 upward. In the illustrated state, a ball 85 engages with the upper end of the mandrel 70 and engages with the portion 74 to integrally connect the mandrel 70 and the spindle 81.

In this support device 80, when the main shaft body 60 is in the position shown in FIG. When the ball 85 is moved downward, the ball 85 can move into the large inner hole 83a at the lower end of the sleeve 83, and the mandrel 70 can be removed from the spindle 81 and another mandrel can be attached to the spindle 81. 65 is deactivated and the rod 65a is returned to its original position, each component of the support device 80 returns to the state shown in FIG. 2, and the mandrel and spindle 81 are integrally coupled.

In this way, in this support device 80, the mandrel can be attached and detached with one touch, and the mandrel can be replaced extremely easily. Furthermore, in this hot ring rolling mill apparatus 100', a second
As shown in the figure and Fig. 3, each slide table 3
A pair of backup rollers 90, 90 are rotatably attached.

Each backup roller 9 is a hand-held member that comes into contact with both sides of the back of the lower end of the mandrel 70 at the forward end and receives the reaction force from the workpiece Wo acting on the mandrel 70, and includes a pair of upper and lower bearings 91, 91 and a labyrinth collar 92.
, 92 and a collar 93 are roughly attached to a bracket 95 via pins 94. The bracket 95 is
The slide table 301 is placed on a fixed stop plate 96, and is fixed by a wedge 98 which is moved up and down by a bolt 97 and a clamp rod 99 which is moved by the upward movement of the wedge 98. A workpiece receiving plate 33 is provided on the bracket 95, and the workpiece receiving plate 33 is fixed to the slide table 30. This hot ring rolling mill device 10 is configured as described above so that the reaction force from the workpiece WO acting on the mandrel 7 is received by both backup rollers 90, 90. Foreign matter (scale peeled off from the workpiece Wo during machining, etc.) hardly ever enters between the mandrel 70 and each backup roller 90, and the lower end of the mandrel 70 is reliably supported, protecting the mandrel 70 and maintaining machining accuracy. can be achieved.

Note that the present invention is not limited to the above-mentioned embodiments, but includes a main roller that is rotatably attached to the bed and driven to rotate, and a mandrel that is rotatably assembled to the main body that is movably attached to the bed. , various hot ring rolling mill devices that produce large-diameter, thin-walled products by passing a heated small-diameter, thick-walled annular material through a mandrel on the inner side and contacting and pressurizing the outer side with a rotating main roller. It can be implemented in the same manner as or with appropriate changes. In short,
In the present invention, in the hot ring rolling mill apparatus described above, one end of the mandrel is removably fixed by being competitively inserted into a mounting hole provided at one end of a spindle rotatably supported by the main body, and A hole is provided in the mandrel in a vertical direction from the other end toward one end, and a second hole is provided from the inner end of the hole toward the outer periphery of one end of the mandrel to form a first water channel, and the main body is provided with a hole. A second water channel is formed in a part provided on the outer periphery of the spindle with a pair of annular seal members roughly attached to the same member and in contact with the outer periphery of the spindle, and the spindle has both water channels. A third waterway was formed to allow cooling water to flow through these waterways.

Therefore, in the present invention, by directly connecting the cooling water supply pipe to the second water channel, the cooling water can be guided to the water channel of the rotating spindle, and the mandrel can be cooled during machining. Damage can be prevented and machining accuracy can be maintained.

Also, since the mandrel can be cooled during processing,
There is almost no need for cooling during non-processing, so the non-processing time can be shortened, and the operating rate of the apparatus can be increased. In addition, the mandrel can be removed from the spindle mounting hole and replaced easily. When replacing the mandrel, insert the mandrel into the spindle mounting hole to connect the first waterway and the third waterway.
It is possible to connect two water channels, and the two water channels can be joined extremely easily.

[Brief explanation of the drawing]

Fig. 1 is a front view of a hot ring rolling mill device according to the present invention, Fig. 2 is an enlarged vertical cross-sectional view of the main part of the present invention, and Fig. 3 is a part taken along the line m--conic in Fig. 2. FIG. Explanation of symbols, 100...Hot ring rolling mill device, 10...Bed, 20...
Main. roller, 60... spindle body, 63... cover (member), 70... mandrel, 72, 73... hole, 81...
...Spindle, S,, S2...Annular seal part village, P7o...(first) waterway, P63...(second) water chick, P8,...(third) waterway, Wo... Work (material). Figure 2 Figure 3 Figure Ship

Claims (1)

[Claims] 1 A heated small-diameter, thick-walled annular material is equipped with a main roller that is rotatably assembled to the bed and driven to rotate, and a mandrel that is rotatably assembled to the main body that is movably assembled to the bed. In a hot ring rolling mill device that manufactures large-diameter, thin-walled products by passing a mandrel on the inner diameter side and contacting and pressurizing the outer diameter side with a rotating main roller, one end of the mandrel is rotatably attached to the main body. The mandrel is removably fixed by fitting into a mounting hole provided at one end of the supported spindle, and a hole is provided in the mandrel in the axial direction from the other end toward one end, and the mandrel is inserted from the inner end of this hole. A second hole is provided toward the outer periphery of one end to form a first water channel, and the member is assembled to the member provided on the main body and provided on the outer periphery of the spindle so as to be in sliding contact with the outer periphery of the spindle. A second water channel is formed by a pair of annular seal members, and a third water channel is formed in the spindle and communicates with both of the water channels, so that cooling water flows through these water channels. mill equipment.