JPH0147262B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a disk by drawing a disk-shaped material into a dish-shaped or bowl-shaped shape such as a disk, bread, tire wheel, etc.

Generally, such tire wheel discs are formed into a rough shape using, for example, a rolling mill or a press machine.
Next, drawing is performed to form a disc of the desired shape, but the processing is labor-intensive, and the deformation work using a press causes large spring back, making it impossible to obtain accurate dimensions. For this reason, a method has been proposed in which a donut-shaped disc material is first formed into an intermediate form in a rough drawing process using a drawing machine, and then formed into a predetermined disc in a finishing process (for example, Japanese Utility Model Publication No. 54-9872 No.), the edge of the outer periphery of the disk (the tip of the rim flange) is thinner than the central hub, and a structure is adopted to reduce the weight of the outer periphery. Therefore, in the drawing process, the forming roll performs both drawing and rolling actions, so the reaction force is large, and therefore the bearing that supports the forming roll in rotation has to be large, and as a result, the forming roll has a large diameter and a large weight. Therefore, when it comes into contact with a rotating material, it takes some time for it to follow and rotate, which may cause a sputter and damage the material.

Furthermore, the disk is formed with a deep-drawn bent portion or cushion portion in order to obtain elasticity and impact strength, and there are problems such as buckling and failure to form an accurate shape at normal drawing speeds.

In view of these points, it is an object of the present invention to provide a disk processing method that enables strong drawing processing and forms a cushion portion accurately.

The method of the present invention will be explained below based on the embodiments shown in the drawings.

The wheel processing machine 1 includes a headstock 3 that rotatably supports a main spindle 2, and a saddle 4 installed opposite to the headstock 3, and a molding die 5 is attached to the tip of the main spindle 2. The saddle 4 includes a pressing member 6 that presses the material W against the spindle 2 side, and a pair of forming rolls 8 and 9.
A molded member 7 having a shape is provided. The pressing member 6 consists of a tailstock 10 and a pressing plate 11 rotatably attached to the tip of the tailstock 10, and the forming member 7 supports the forming rolls 8, 9 and the forming rolls 8, 9. a common support frame 12 and attached to said support frame said tailstock 10;
The hollow piston 13 and the tailstock 10 are connected to the main cylinder 1 attached to the saddle 4 as shown in FIG.
It is inserted into 5. The hollow piston 13 is
It is hermetically fitted into the main cylinder 15 with the rear end 13a as the large diameter part, and the middle part forms a gap 16 with the main cylinder 15, and the tip of the main cylinder 15 has oil that communicates with the gap 16. A port 17 is provided, and a mounting flange 1 is provided at the tip of the hollow piston 13.
The support frame 12 is attached via 8. The tailstock 10 has a rear end 10a having a large diameter, and is hermetically fitted into the hollow piston 13, and the middle part is fitted into a mounting flange 18. An oil port 20 communicating with the gap 19 is opened. Further, the tailstock 10 is formed in a hollow shape with an open bottom, and the hollow hole 21 is provided with the main cylinder 1.
A sleeve 23 attached to the bottom cover 22 of No. 5 is fitted and inserted, and the outer periphery of the sleeve 23
The sleeve 23 is provided with a flange portion 23a, and a gap 24 is formed between the bottom of the hollow piston 13 and the bottom cover 22. An oil port 25 communicating with the sleeve 24 and an oil port 26 communicating with the inner hole of the sleeve 23 are provided. The support frame 12 is connected to the saddle bed 3 as shown in FIG.
Support brackets 31 and 32 are supported slidably in the longitudinal direction of the machine on the top of the machine, and attach forming rolls 8 and 9 on the left and right sides with the processing axis, that is, the press member 6 in between. The support brackets 31 and 32 are slidably supported perpendicular to the hydraulic cylinder 3.
a gauge plate 43 that is moved close to and away from the machining axis by 5 and 36 and supported by gauge mounting members 41 and 42 that are attached to a connecting bar 40 that connects the machine saddle 4 and the headstock 3; 44
The fragile devices 45 and 46 facing the arms 47 and 4
It is attached via 8. The relevant device 45,
46 is mainly composed of, for example, a potentiometer, and the amount of movement of the levers 49, 50 that come into contact with the gauge plates 43, 44 is electrically detected, and the hydraulic cylinders 35, 36 are actuated based on this. The forming rolls 8 and 9 are moved forward and backward in relation to gauge plates 43 and 44, respectively.

The forming rolls 8 and 9 are fixed to the tips of roll shafts 55 (however, only one forming roll 8 side is shown in cross section in FIG. 5) which are rotatably supported by support brackets 31 and 32, respectively. axis 55
are connected to hydraulic motors 57 and 58 via a one-way dog clutch 56, and the hydraulic motors 5
7, 58 drive each forming roll 8,
Reference numeral 9 denotes a material W which is rotated in a predetermined direction and whose forming rolls 8 and 9 rotate together with the main shaft 2 as described later.
When the hydraulic motors 57, 58
The forming rolls 8 and 9 follow the material W and rotate together. Further, the forming rolls 8 and 9 have one side as the rough forming roll 8,
The other side is used as a finish forming roll 9, and the rough forming roll 8 performs dry drawing to form a rough shape, which is then formed into a desired shape along the mold shape by the finishing forming roll 9, as shown in Fig. 7. As shown, the rough forming roll 8 has a required leading distance X with respect to the finishing forming roll 9.
and a phase difference amount Y that is perpendicular to this.The leading distance , when the phase difference amount Y is large, the load on the finishing roll 9 is greater than that on the roughing roll 8, and if the leading distance There are various problems such as the following, and the optimal position suitable for these problems is determined empirically.

Further, the forward speed of the forming rolls 8 and 9 is determined by the shape to be formed, and if the shape is a simple shape with a uniform load during forming, the drawing process is of course carried out at a uniform feed speed. In addition to the rolling action that gradually reduces the wall thickness, deep-drawn recesses or thickness change portions e are formed to provide elasticity and impact strength during use. Therefore, in the present invention, the feeding speed of the forming rolls 8 and 9 is made slow, and the feeding speed is made slower for the recessed portion e or between the bent portions e to d than for other portions, thereby ensuring reliable drawing. It is designed to perform processing or bending, and the drawing rolls 8 and 9 are fed at the sixth
This is performed by a hydraulic circuit C for the main cylinder 15 shown in the figure, and this hydraulic circuit will be explained below.

The hydraulic circuit C includes a circuit 60 communicating with the oil port 26 for reciprocating the tailstock 10;
A circuit 61 communicating with the oil port 20 is connected to an electromagnetic directional control valve 62, and a circuit 63 communicating with the oil port 25 for reciprocating the hollow piston 13 and a circuit 64 communicating with the oil port 17 are connected to the electromagnetic directional control valve. 65, respectively.
However, the electromagnetic directional control valves 62 and 65 are pressure closed center type with 3 positions and 4 ports, and the circuit 60
The backflow prevention check valve _V1 provided in the backflow prevention check valve V1 is a pilot check valve, and a pilot pressure is selectively applied by a two-position, four-port type electromagnetic directional switching valve 66.

The circuits 63 and 64 are a circuit 68 in which a 2-position 4-port electromagnetic directional control valve 67 and a check valve V ₂ are connected in series.
The circuit 68 is connected to the circuit 63 by
Pressure oil is supplied into the gap 24 from , and when the hollow piston 13 is pushed out, hydraulic oil discharged from the oil port 17 on the opposite side is selectively supplied to the circuit 63 via the circuit 68. , the hollow piston 13 is moved at high speed by the circuit 63. Further, the circuit 64 is provided with circuits 70 and 72 in parallel, and the circuits 70 and 72 are respectively provided with flow rate adjustment valves V ₃ and V ₄ and 2-position and 4-port electromagnetic directional switching valves 71 and 73 to adjust the flow rate. Valve V ₃ ,
_V4 is set to an appropriate resistance value, and the electromagnetic directional control valve 71,
By selectively operating 73, the hollow piston 13 is caused to shift to a required medium speed or low speed.

A circuit 74 provided in the circuit 63 is a discharge circuit for returning the hollow piston 13, and a pilot check valve _V5 provided in the circuit 63 is opened by applying pilot pressure by operating an electromagnetic directional control valve 75. It is something. Also, V ₆ is a counterbalance valve with the required spinal pressure, V ₇ is a pressure reducing valve, and V ₈
is a flow rate adjustment valve, V ₉ , V ₁₀ , V ₁₁ , V ₁₂ is a throttle valve with check, V ₁₃ is a pilot check valve, V ₁₄ , V ₁₅
is a throttle check valve, and _V16 is a relief valve.

Next, a method of forming the material W will be described.

Note that disk B formed by the method of the present invention
As shown in FIG. 7, the flat hub part a has a thick wall, and the cylindrical rim flange b has a wall that is gradually thinner or thicker in the middle from the flange base C to the flange tip d, and A recess e is formed close to the flange tip d to provide elasticity and impact strength.

First, the doughnut-shaped material W is molded into a mold 5 by an appropriate means.
and the press plate 11, the solenoid 62a of the electromagnetic directional control valve 62 of the hydraulic circuit C (FIG. 6) for the main cylinder 15 is activated, and the circuit 60
The gap 19 is communicated with the tank T via the circuit 61, and pressurized oil is supplied from the oil port 26 into the gap 21. As a result, the tailstock 10 moves forward, and the protrusion 11 of the pressing plate 11
A is inserted into the central hole Wa of the material W, and the material W is pressed and held against the mold 5.

a forming roll 8 supported by a support frame 12;
9, as mentioned above, the rough forming roll 8 is installed in front of the finishing forming roll 9 by a leading distance motor 5
7,58. The forming rolls 8, 9
The peripheral speed of the outer periphery of the material W rotated together with the main shaft 2 is
Approximately approximate the circumferential speed of the abutting part against
Alternatively, it is rotated at a slightly higher speed, and in this state, the solenoid 65a of the electromagnetic directional control valve 65 is operated, the circuit 63 is communicated with the pump P, and pressure oil is introduced into the gap 24 from the oil port 25. At the same time, the electromagnetic directional control valve 67 is operated, the circuit 63 and the circuit 64 are connected through the differential circuit 68, and the hydraulic oil discharged from the oil port 17 is introduced into the circuit 63 via the circuit 68, and the forming roll 8, 9 is material W
The feeding section P is moved at high speed until approaching the forming rolls 8,
The hydraulic motors 57 and 58 of 9 are disconnected, each forming roll shifts to inert rotation, and at the same time the electromagnetic directional control valve 67 is turned off.
is released, the electromagnetic directional control valve 71 is operated, and the hydraulic oil discharged from the oil port 17 is controlled by the flow rate adjustment valve _V3.
The finished forming roll 9 is moved at medium speed through the first squeezing section Q up to the recess e. However, as described above, the rough forming roll 8 is given a phase difference Y by the rough gauge plate 43 with respect to the finishing forming roll 9, and performs dry drawing.
A finishing roll 9 is used to form a rim flange base C having a desired shape and having a wall thickness that is successively thinned. When the finishing roll 9 finishes the first squeezing section Q, the electromagnetic directional switching valve 71 is released, the electromagnetic directional switching valve 73 is operated, and the hydraulic oil discharged from the oil port 17 is transferred to the flow rate adjusting valve V _{4 .} The molding rolls 8 and 9 are moved at a speed lower than the above-mentioned speed, and thereby sufficient squeezing and rolling operations are performed by the finishing molding rolls 9. After passing through this low-speed precision drawing section R, the electromagnetic directional switching valve 73 is released again, the electromagnetic directional switching valve 71 is operated, and drawing processing is performed in the second drawing section S at the medium speed, and a predetermined disk is drawn. B is obtained. In this embodiment, the transition speed of the drawing process was changed to two stages of medium speed and low speed, but if necessary, it may be changed to three stages of medium speed, low speed, and very slow speed in the same manner. Even when the recess is provided not only at one location but at two or more locations, an accurate recess can be formed by changing the transition speed in the manner described above.

As described above, in the forming method of the present invention, a rough forming roll and a finishing forming roll are provided facing each other across the processing axis on a common support frame, and empty drawing by the rough forming roll and finishing forming by the finishing forming roll are performed. Because they are carried out simultaneously, the reaction forces applied to each forming roll are canceled out, making it possible to perform a strong drawing process, and each forming roll rotates with rotation applied in advance. Since the forming roll is in contact with the material, there is no risk of damaging the material due to slips as it rotates with the material, and the feeding speed is variable according to the shape to be formed, which requires a large amount of force for drawing. The drawing process is performed reliably by using a slow feed rate depending on the shape of the part or the part that is prone to spring back, while the feed rate is increased for relatively easy shapes, increasing efficiency. It is possible to measure the improvement in Furthermore, the rough forming roll has a leading distance and a phase difference amount with respect to the finishing forming roll,
In addition, by appropriately setting each amount, an appropriate load is applied to the finish forming roll, and there are effects such as being able to form effectively and accurately without causing spring back.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the method of the present invention, in which Fig. 1 is a front view of a wheel processing machine, Fig. 2 is a central vertical sectional view of the saddle, Fig. 3 is a front view of the saddle, and Fig. 4 is a diagram of the saddle. FIG. 5 is a partially cutaway plan view showing the machining procedure, FIG. 6 is a hydraulic circuit diagram, FIG. 7 is an explanatory diagram of machining, and FIG. 8 is an explanatory diagram of feed speed. DESCRIPTION OF SYMBOLS 1...Wheel processing machine, 2...Main shaft, 5...Male die, 6...Press member, 8...Rough forming roll, 9...
...Finishing roll, 12...Support frame, 13
...Hollow piston, 43,44...Gauge plate, 5
7,58...Hydraulic motor.

Claims (1)

[Claims] 1 A pair of forming rolls are installed on a common support frame with the processing axis in between, and each forming roll is moved in the direction of the processing axis in accordance with a forming gauge, and one of the forming rolls is roughened. The forming roll is used as a finishing roll, and both forming rolls are rotated in advance and brought into contact with the rotating material.The feed speed is changed slowly according to the shape of the drawing part, and a forming gauge is set for each forming roll. so that the dry drawing of the material by the rough forming roll and the final forming of the dry drawn material by the finishing forming roll are performed at the same time,
A method for forming a disk, characterized in that the rough forming roll has a required amount of leading distance and phase difference with respect to the finishing forming roll.