JPH0710818Y2 - Hot spinning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to the provision of a spinning device for hot-molding an aluminum wheel used in automobiles such as passenger cars, buses and trucks. .

(Prior Art) As a device for manufacturing a tire wheel of a cylindrical material having a concave or H-shaped cross section having an outer periphery, for example, an aluminum forged product, a main shaft mechanism having an inner surface molding die at its drive shaft tip. , A tailstock mechanism having an inner surface molding die at the tip of the driven shaft facing it, and holding the circular material between the respective dies and rotating it around the shaft center, and processing the outer peripheral surface of the circular material cylindrical portion with the processing roller. Needless to say, a spinning device for forming by ironing by pressing is known. At that time, the number of processing rollers used to be one, but in recent years, a method using a plurality of processing rollers has been adopted in view of cycle time, workability, etc. (Jitsuko Sho 57-15).
(See JP 2227).

Furthermore, recently, a multi-functional machine has been developed that enables these plural processing rollers to operate under independent work force for ironing and adds a switching function and a copying function (actual). No. 62-77620), No. 7
The outline of one example of the spinning machine disclosed in Japanese Utility Model Laid-Open No. 62-77620 will be explained with reference to the drawings. The one shown in the same figure is an example of a vertical spinning machine, but as shown in FIG. 8 (1), an outer concave or H-shaped aluminum forged product having a cylindrical portion 112A on the outer periphery of a disk portion 112B. Circular material by 112
A main shaft mechanism 116 having an inner surface molding die 118 at the tip of its drive shaft 117, and a tailstock mechanism 111 having an inner surface molding die 113 at the tip of a driven shaft 115 facing the main shaft mechanism 116. The circular material 112 is sandwiched between 118 and 113 and rotated about the axis, and the outer peripheral surface of the cylindrical portion 112A of the circular material 112 is pressed through the switching of a plurality of processing rollers 135, 136 and 135 ′ to perform ironing, and Cylinder 115A with mold 118,113
Spinning device for forming the inner peripheral surface of
A plurality of roller heads 122, 122 'are independently arranged in the frame 109 in the rotational direction of the drive shaft 117 of the 116 and the driven shaft 115 of the tail stock mechanism 111,
The roller head 122 ′ is provided with a processing roller 135 ′, and further, at least one roller head 122 is provided with processing rollers 135 and 136 with a space in the axial direction of both shafts 117 and 115. 135 'and processing roller 1
There are provided pressing cylinder mechanisms 139 ', 139 and 140 for making 35 and 136 respectively movable toward and away from the molds 118 and 113, and further, the roller heads 122 and 122' are reciprocally movable in the axial directions of both shafts 117 and 115. Cylinder mechanism 1
41 'and 141 are provided. Therefore, according to this spinning device, the circular material shown in FIG.
112 is loaded on the common axis of the tail stock mechanism 111 and the main shaft mechanism 116, the cylinder mechanism 114 of the tail stock mechanism 111 is extended, and the disk portion 112B of the material 112 is sandwiched between the two dies 113 and 118. Next, the drive shaft 1 of the main shaft mechanism 116
17 is rotated, the driven shaft 115 is rotated along with it, and the material 112
Rotate around the axis. The processing roller 136 is positioned on the radiation of the material 112, the cylinder mechanism 140 is extended, and the processing roller 136 is pressed onto the outer peripheral surface of the material 112.
By extending 141, the outer peripheral surface of the cylindrical portion 112A is subjected to ironing and copying. In addition, another processing roller 13
5'is made to correspond to the material 112 via the cylinder mechanism 141 ', and then the processing roller 13 is extended by the extension of the cylinder mechanism 139'.
5'is pressed on the outer peripheral surface of the material 112, and is rotated by continuing the rotation of the material 112 and the extension of the cylinder mechanism 141 'to perform ironing and profile stretching ironing to form the shape shown in FIG. 8 (3). Although not shown in FIG. 7, in addition to the processing rollers 135, 136 and 135 ′, by providing a finishing processing roller having a similar cylinder mechanism, as shown in FIG. 8 (4). Then, the same ironing and copying processes are carried out to obtain the final product as a wheel.

(Problems to be solved by the invention) Needless to say, the conventional spinning device described above performs the spinning process in the cold state, and of course, spins a forged material having good extensibility in the cold state. Although it is possible to process, generally, when ironing a forged material having poor extensibility such as an aluminum forged product, there is a problem that cracks are likely to occur during the process.

For this reason, it is necessary to reduce the amount of processing per pass, so the processing man-hours are large and the productivity is poor, and the material is removed from the spinning device during processing and annealed at least once, and then re-processed. Since it takes time and labor for processing, in an extreme case, as shown in FIG. 8, a step such as interposing an annealing treatment 150 is required for each ironing process, and the production efficiency is significantly reduced. Yes, there are qualitative concerns and cost pressure on the resulting products.

Therefore, it is conceivable to heat the material during spinning to increase its malleability, but if a heating means is provided only on the outside of the material, there is a processing roller radially outside the material. The position where it is placed is limited, which means that the material cannot be heated at too high a temperature.

On the other hand, if the heating means is embedded in the mold, the processing roller does not get in the way and the material can be heated directly from the inside.

However, if the heating means is simply embedded in the mold, the heat from the mold is transferred to the bearings through the drive shaft and the driven shaft, and thermal stress causes excessive friction between the bearings and both shafts. This may cause rotation failure and early damage to the bearing.

In view of such circumstances, an object of the present invention is to provide a hot spinning device capable of efficiently heating a rotating circular material without causing rotation failure and premature damage to the bearing portion.

(Means for Solving the Problems) In order to achieve the above object, the technical means taken by the present invention are:
The drive shaft 2 and the driven shaft 3 rotating about the same axis are inserted into the bearing tubular portion 16a in a state of being separated from each other in the axial direction, and the mold 4 and the driven shaft 3 are respectively attached to the opposing end portions of the drive shaft 2 and the driven shaft 3. 5, a processing roller that presses the outer peripheral surface of the circular material 6 radially outward of the circular material 6 that is sandwiched between the molds 4 and 5 and rotates.
In the spinning device provided with 11, a heating means 8 for heating the circular material 6 sandwiched between the molds 4 and 5 from the inside is embedded in the molds 4 and 5, and the bearing tubular portion 16
The point is that a cooling jacket 18 is provided on the outer periphery of a.

(Operation) The heating means 8 embedded in both molds 4 and 5 is
The circular material 6 sandwiched therebetween is heated from the inside to enhance the malleability of the circular material 6 being processed.

On the other hand, the cooling jacket 18 provided on the outer periphery of the bearing tubular portion 16a
Cools the bearing tube portion 16a from the outside to prevent excessive thermal stress from occurring in the bearing portions of the drive shaft 2 and the driven shaft 3.

(Embodiment) A suitable embodiment of the device of the present invention will be described with reference to FIGS. 1 to 6. The spinning device 1 of the present invention illustrated in FIG.
In the above, the components necessary for the spinning process, that is, the main shaft mechanism, the tail stock mechanism, the drive shaft, the driven shaft, the molding die held by both shafts, and the plurality of processing rollers are all previously described in the seventh section. Since it is the same as the prior art illustrated in the drawing, some of them are omitted in FIG. 1 and only the heating means which is the feature of the present invention is illustrated. A mold 4 for molding the inner surface of a circular material 6 having a concave or H-shaped cross section having a cylindrical portion 6a on the outer circumference is provided at the tip of a drive shaft 2 rotatably mounted on a main shaft mechanism 16 via a heat insulating material 9. The tailstock mechanism 17 which is held and opposed to the main shaft mechanism 16 is opposite to the circular material 6 at the tip of the driven shaft 3 which is concentrically and rotatably mounted on the drive shaft 2 and also through the heat insulating material 9. A mold 5 for holding the inner surface is held, and a mold heater 8 for heating and maintaining the mold itself by, for example, a resistance heater is built in both or one of the molds 4 and 5. In the case of the circular material 6 which is provided between the molds 4 and 5 and is rotated between the metal molds 4 and 5, the work heater 7 for heating and keeping the temperature of the circular material 6 is also provided at a position where it does not interfere with the processing roller 11. , Is fixedly arranged in the outer space of the cylindrical portion 6a of the raw material 6, so that both Using the chromatography data 7,8, it is obtained by allowing a hot spinning. still,
Although only one processing roller 11 is shown in FIG. 1, this is similar to that described in the prior art in that a necessary plurality of processing rollers are used. The drive shaft 2 is driven by a prime mover 12 such as a motor, a drive wheel 13, a transmission member 14, and a driven wheel.
The driven shaft 3 is integrally rotated together with the driven shaft 3.

In this embodiment, the heat from the die heater 8 causes the two shafts 2,
A cooling device 10 for preventing excessive thermal stress from being generated in the bearing portion of 3 is provided.
And a bearing tube portion 16 for rotatably supporting the driven shaft 3
A cooling jacket 18 is provided around the outer periphery of a.

The cooling jacket 18 is connected to a tank 20 outside the machine via a cooling circuit 21, and the refrigerant in the tank 20 is supplied to the cooling jacket 18 by a pump 19.

The structure of the mold heater 8 provided in the molds 4 and 5 is not limited to any one, but a suitable example will be described with reference to FIGS. 2 to 4. Since the driven shaft side mold 5 has the same structure, only the driven shaft side mold 5 will be described in the illustrated example. That is, the mold 5 is divided into two parts such as the upper mold 5a and the lower mold 5b, and a necessary accommodation space is formed between the molds to prevent electric leakage to the mold side. Then, a heater 23 for heat generation is attached via an envelope of an insulator 24, and two sets of slip rings 26, 2 are provided on the outer peripheral surface of the mold 5 which surrounds the ring 5 via a slip ring retainer 27 made of an insulator.
6 installed, each slip ring 26,26 and the heater for heat generation
Both ends of 23 are connected by connecting rods 25, 25, and the electrodes 28, 28 are attached to the fixed mount 30 via springs 29, 29, respectively, and slip rings 26, 26 are attached under pressure contact with the electrodes 28, 28. Is slidably rotated to be energized, and the heater 23 generates heat to heat and keep the mold 5 warm.

Further, in the work heater 7, as shown in FIGS. 5 and 6, the heater 7 is fixedly arranged at one or more positions where it does not interfere with the processing roller 11, and since it stops at the fixed position. , General electric heater is enough, both molds
As the circular material 6 sandwiched by the rollers 4 and 5 rotates, the cylindrical portion 6a on the outer periphery thereof is heated when passing through the heater 7, so that the entire circumference of the cylindrical portion 6a is easily heated. In this case, the heater 7 may have a shape and size that cover the outer peripheral cylindrical portion 6a and further the outer periphery of the molds 4 and 5.
Of course, the structure of the heaters 7 and 8 is not limited to the illustrated example, and the design is free. According to the embodiment described above, the mold 4,
The circular material 6 sandwiched between 5 is heated by both heaters 7 and 8,
By keeping it warm, this can be maintained in a hot state of, for example, 300 to 400 ° C, and spinning can be performed by the hot working roller 11, so a circular shape made of an aluminum cast product or the like that has poor extensibility in the cold state. Even with material 6, annealing is performed outside the machine during processing,
Since continuous processing can be easily performed without the need for reheating treatment, the processing amount per pass can be increased,
The productivity is greatly improved, and the processing accuracy is also improved.

(Effect of the Invention) According to the present invention, the heating means 8 embedded in both the molds 4 and 5.
The circular blank 6 can be heated directly from the inside by the cooling jacket 18 provided on the outer circumference of the bearing tube portion 16a to cool the bearing tube portion 16a from the outside, so that rotation failure and early damage of the bearing portion due to thermal stress are caused. The rotating circular material 6 can be efficiently heated without rotating.

[Brief description of drawings]

FIG. 1 is a front view of an essential portion of an embodiment of the device of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 3 of the same embodiment of the die heater, and FIG. 3 is a sectional view taken along the line BB in FIG. FIG. 4 is a detailed sectional view of a portion C in FIG. 3, FIG. 5 is a plan view of the embodiment of the heater for the work, FIG. 6 is a sectional view taken along line AA in FIG. 5, and FIG. 7 is conventional spinning. FIG. 8 (1) (2) (3) (4), which is a vertical sectional front view of one example of the apparatus.
FIG. 4 is an explanatory diagram of a circular material ironing process. 1 ... Spinning device, 2 ... Drive shaft, 3 ... Driven shaft, 4,5 ...
Inner surface molding die, 6 ... Circular material, 6a ... Cylindrical part, 7 ... Work heater, 8 ... Mold heater, 16 ... Spindle mechanism, 17 ... Tail stock mechanism.

Claims (1)

[Scope of utility model registration request] 1. A bearing tubular portion (16) with a drive shaft (2) and a driven shaft (3) rotating about the same shaft center separated from each other in the axial direction.
Inserted in a), molds (4) and (5) are provided at the opposite ends of the drive shaft (2) and the driven shaft (3), respectively, and sandwiched between the molds (4) and (5). A spinning device provided with a processing roller (11) for pressing the outer peripheral surface of the circular material (6) radially outward of the rotating circular material (6). A heating means (8) for heating the circular material (6) sandwiched between them from the inside is embedded, and a cooling jacket (1) is provided on the outer periphery of the bearing tubular portion (16a).
8) A hot spinning device characterized by being provided.