JPS59223130A - Forming method of disk - Google Patents

Abstract

PURPOSE:To perform empty drawing and finish forming simultaneously and to form a cushion part on a disk correctly by providing a rough forming roll and a finish forming roll on a common supporting frame and changing feeding speed according to the shape of drawing. CONSTITUTION:A material W is inserted between a die 5 and a press plate 11, and the material W is held by inserting a projection 11a of the press plate 11 into the center hole Wa of the material W. A rough forming roll 8 is mounted to the supporting frame 12 in front of a finishing roll 9 leaving preceding distance and driven by hydraulic motors 57, 58. After moving at high speed in a feeding section until forming rolls 8, 9 draw near to the material W, the empty drawing is made by the rough forming roll 8 shifting to inertial rotation, and a rim flange base of required shape in which thickness is lessened gradually is formed by the finish roll 9. A disk having accurate concavity can be drawn by the change of shifting speed.

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, and then subjected to drawing processing to form a disc of the desired shape. Deformation work has problems such as large springback and inability 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 shape M in a rough drawing process using a drawing machine, and then formed into a predetermined disc in a finishing process.
For example, in Utility Model Publication No. 54-9872), the outer peripheral edge of the disc (the tip of the rim 7 flange) is made thinner than the central hep, and a structure is adopted to reduce the weight of the outer peripheral part. 0 Therefore, in the drawing process, the forming rolls are used for both drawing and rolling, so the reaction force is large. Therefore, the bearings that rotatably support the forming roller must be large, and as a result, the forming process is The material has a large diameter and is heavy, so when it comes into contact with a rotating material, it takes some time for it to follow and rotate, which may cause slippage and damage to the material. There is.

Furthermore, the above-mentioned disk is formed with a deep-drawn bent part, that is, a shoe-seen part, in order to obtain elasticity and impact strength, and at normal drawing speeds, buckling occurs and an accurate shape cannot be formed. be.

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

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 5, and a molding die 5 is attached to the tip of the main spindle 2. The saddle 4 is provided with a pressing member 6 for pressing the material W toward the main shaft 2, and a forming member 7 having a pair of forming rolls 8.9. The pressing member 6 includes a tailstock 10 and a suppression plate 11 rotatably attached to the tip of the tailstock 1°! The forming member 7 has a common support frame 12 that supports the forming roll 8.9 and the forming roll 8.9, a hollow piston 16 that is attached to the support frame, and into which the tailstock 10 is inserted. A hollow piston 13 and a center restraint 10 are fitted into a main cylinder 15 attached to a saddle 4, as shown in FIG. The hollow piston 13Fi is airtightly fitted into the main cylinder 15 with the rear end 13a as the large diameter part, the middle part forms a gap 16 with the main cylinder 15, and the distal end of the main cylinder 15 has a large diameter part. An oil boat 17 communicating with the gap 16 is provided, and the support frame 12 is attached to the tip of the hollow piston 13 via a mounting 7 flange 18. Tailstock pay 1o is
A hollow piston 1 with a rear end portion 10a having a large diameter! i, and the intermediate part is hermetically fitted into the mounting 7 flange 18, respectively, and the mounting flange 18 has a tailstock 1o and a hollow piston 1.
An oil boat 20 communicating with the gap 19 between the inner hole 3 and the inner hole 3 is opened. ′! The auxiliary cylinder 1o is formed in a hollow shape with an open bottom, and the hollow hole 21 has a bottom cover 2 of the main cylinder 15.
The outer periphery of the sleeve 23 is hermetically fitted to the stepped portion 1313 of the hollow piston 13, and the sleeve 23 is provided with a 7 flange portion 23a. A gap 24 is formed between the bottom and the bottom cover 22, and the bottom cover 221C is provided with an oil boat 25 communicating with the gap 24 and an oil boat 26 communicating with the inner hole of the sleeve 23. As shown in FIG. 3, the support frame 12 is supported on a saddle bed 30 so as to be slidable in the longitudinal direction of the machine, and a forming roll 8.9 is attached to the right side of the press by sandwiching the processing axis, that is, the pressing member 6. The support platenette) 31, 32 is slidably supported between the upper and lower bases 33 and 34, orthogonal to the pressing member 6, and each support platen) 31, 52 is a hydraulic cylinder 5.
5.56, the gauge plate is moved close to and away from the machining axis, and is supported by gauge mounting members 41 and 42 attached to the connecting bar 40 that connects the machine saddle 4 and the headstock 6. Copying device 945 opposite to 43.44.
46 are attached via arms 47.48. The copying devices 45 and 46 are constructed mainly of, for example, a potency layer meter, and the amount of movement of the levers 49 and 50 that come into contact with the gauge plates 43 and 44 is electrically detected, and based on this, the movement of the levers 49 and 50 is detected. 56 is activated, forming roll 8
．． 9 are advanced and retreated following the gauge plates 45 and 44. The forming rolls 8 and 9Fi are each rotatably supported by a support plate 51 and a roll shaft 55 (however, FIG. The roll shaft 55 is connected to a hydraulic motor 57.5B via a one-way dog clutch 56, and each of the roll shafts 55 is Forming roll 8.9Fi is given rotation in a predetermined direction,
As will be described later, when the forming roll 8.9 comes into contact with the material W rotating together with the main shaft 2, the hydraulic motor 57.5
8 is blocked so that the forming rolls 8 and 9 rotate together following the material WK.
- Rule 8.9 uses one roller as a rough forming roll 8 and the other as a finishing forming roll 9. The rough forming roll 8 performs dry drawing to form a rough shape, and the rough shape is then used as a mold shape by the finishing forming roll 9. As shown in FIG. 7, it has the required maximum leading distance X and phase difference ff1Y with respect to the rough forming roll 8#i and the finishing forming roll 9, and the leading distance X is The attachment to the support frame 12 is determined by the position, and the phase difference iY is determined by the shape of the coarse gauge plate 43 with respect to the finished gauge plate 44, and the phase difference ff1Y
When increasing the size, use the finish forming roll 9 rather than the rough forming roll 8.
In addition, if the leading distance Ru.

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 rippling process is of course carried out at a uniform feed speed. In addition to the rolling action that gradually reduces the wall thickness, a deep-drawn recess or thickness change portion θ is formed in order to provide VC elasticity and impact strength during use.

For this reason, in the present invention, the feeding speed of the forming roll 8.9 is slow, and the feeding speed is made slower for the recessed portion e or between the bent portions 0 to 4 than for other portions, thereby ensuring reliability. It is designed to perform drawing or bending, and the feeding of the drawing forming four-wheel 8.9 is carried out by the main cylinder 15 shown in FIG.
This is carried out by a hydraulic circuit C, and this hydraulic circuit will be explained below.

The hydraulic circuit C is connected to a circuit 60 communicating with the oil boat 261C for reciprocating the tailstock 10, and a circuit 61 communicating with the oil boat 20 to an electromagnetic directional control valve 62, and for reciprocating the hollow piston 15. Therefore, the circuit 63 communicating with the oil boat 25 and the circuit 64 communicating with the oil boat 17 are respectively connected to the electromagnetic directional control valve 65. The backflow prevention check valve 71 provided in the circuit 60 is a closed center type, and is a pilot check valve, and a pilot pressure is selectively applied by a second T4 boat type electromagnetic directional switching valve 66.

The circuits 65 and 64 are connected by a circuit 68 in which a 2-position, 4-boat electromagnetic directional control valve 67 and a check valve Va are connected in series. , when the hollow piston 13 is pushed out,
This is a so-called differential circuit that selectively supplies hydraulic oil discharged from the oil boat 17 on the opposite side to the circuit 63 via the circuit 6B, and the hollow piston 13 is moved at high speed by the circuit 66. Further, circuits 70 and 72 are provided in parallel with the circuit 64, and the circuits 7[ ] and 72 are connected to a flow rate regulating valve "IT4.74" and a 2-position 4-boat electromagnetic directional control valve 7, respectively.
1.75 is provided, a flow rate regulating valve "Is", 74 is set to an appropriate resistance value, and by selectively operating the electromagnetic directional control valve 71.75, the hollow piston 16 is moved to a required medium speed,
This causes the speed to shift to a low speed.

Note that a circuit 74 provided in the circuit 63 is connected to the hollow piston 1.
In the 6-return discharge circuit, a pilot cheek valve v6 provided in the circuit 63 is opened by applying pilot pressure through the operation of the electromagnetic directional switching valve 75. Also, ■6 is a counterbalance valve with the required pressure, vv
h Pressure reducing valve, y a H flow rate adjustment valve, y 9.710.
Vzx/vz- is a check throttle valve, yxs is a pilot check valve, vz4. vz6 is a throttle check valve, and Vllll+ is a relief valve.

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

Note that the disk r formed by the method of the present invention has the seventh
As shown in the figure, the flat hep part a has a thick wall, and the cylindrical rim 7 flange b has a thinner wall or a thicker part in the middle from the 7 flange base C to the 7 flange tip d, and A recess θ tube is formed adjacent to the flange tip d to provide elasticity and impact strength.

First, after the doughnut-shaped material W is inserted between the mold 5 and the suppression plate 11 by an appropriate means, the solenoid 62 & of the electromagnetic directional control valve 62 of the hydraulic circuit C (FIG. 6) for the main cylinder 15 is inserted. The circuit 60 is activated to communicate with the pump P, supplying pressure oil from the oil boat 26 into the gap 21, and at the same time, the gap 19 is communicated with the tank T via the circuit 61.

As a result, the tailstock 10 moves forward, and the projection 1 of the pressing plate 11
1a is inserted into the central hole Wa of the material W and is pressed against the material W'1 by the mold 5.

Forming roll 8° 9Fi supported by support frame 12 As mentioned above, the rough forming roll 8 is installed in front of the finishing forming roll 9 by a distance X, and prior to the operation of the hollow piston 13. Each forming roll 8.9 is driven by a hydraulic motor 57.58. The circumferences of the outer peripheries of the forming rolls 8 and 9 are rotated at a speed approximately approximating the circumferential speed of the contact portion against the material W rotated together with the main shaft 2, or at a speed slightly higher than that, and in this state, electric current is applied.
The solenoid 65ak of the magnetic direction switching valve 65 operates, and the circuit 6
3 is connected to the pump P, and pressure oil is introduced into the oil boat 25 and the shaft 24. At the same time, 'i magnetic directional control valve 6
7 is activated, the circuit 63 and the circuit 64 are connected by the differential circuit 6B, and the oil is introduced into the circuit 63 via the entire hydraulic oil circuit 68 from which the oil is discharged from the first part 17, and the forming roll 8.9 The feeding section P until approaching the material WK is moved at high speed, the hydraulic motors 57 and 58 of each of the forming rolls 8 and 9 are disconnected at the close position, and each forming roll shifts to inertial rotation, and at the same time it rotates in the electromagnetic direction. The switching valve 67 is released, the electromagnetic directional switching valve 71 is activated, and the discharged hydraulic oil from the oil boat 17 is regulated by the flow rate adjustment valve Va and flows into the tank T, and the finishing roll 9 reaches the recess e. The first aperture section Qt is shifted at medium speed. However, as mentioned above, the rough forming roll 8 is connected to the rough gauge plate 43 with respect to the finishing forming roll 9.
The amount of phase difference Y is given, and the empty drawing 9 is performed, and the finishing forming roll 9 forms the flange base C of the rim 7 of the desired shape with the wall thickness successively thinner.◎The finishing forming roll 9 performs the first drawing 9
At the end of section Q, the electromagnetic directional control valve 71#i
It is released, the electromagnetic directional switching valve 73 is operated, and the discharged hydraulic oil from the oil boat 17 is regulated by the flow rate regulating valve v4 and flows into the tank T, and each forming roll 8.9 is moved at a speed lower than the above speed. As a result, sufficient drawing and rolling operations are performed by the finishing roll 9. After passing through this low-speed precision drawing section R, the electromagnetic directional switching valve 75 is released again, the electromagnetic directional switching valve 71 is activated, and the second drawing section S is carried out at the medium speed. This is to obtain disk B of .

In this embodiment, the transition speed of the drawing process was changed to two stages, intermediate speed and low speed, but if necessary, it may be changed to three stages of intermediate speed, low speed, and very slow speed in the same manner. By changing the transition speed in the manner described above, it is possible to form accurate depressions even when three or more locations are provided. The roll and the finish forming roll are placed opposite each other on a co-advancing support frame, and the dry drawing by the rough forming roll and the finishing forming by the finish forming roll are performed at the same time.
The reaction forces applied to each forming roll cancel each other out, so strong drawing can be performed, and each forming roll comes into contact with the rotating material in a pre-rotated state. When the forming roll rotates with the material, there is no risk of damage to the material due to slipping, and the feeding speed is variable according to the shape to be formed, so that the large force f for drawing is reduced, or the spring batter is reduced. Processing is performed at a slow feed speed depending on the shape of the parts that are likely to occur, so that the process is carried out reliably, and for relatively easy shapes, the feed speed is increased to improve efficiency. It has the following effects:

[Brief explanation of the drawing]

The drawings illustrate the processing mode of the method of the present invention, and FIG. 1 is a front view of a wheel processing machine, FIG. A plan view of the front portion of the saddle, and the figure is an explanatory diagram of the feed rate. 1...Wheel processing machine 2...Main shaft 5...Male die 6...Suppression member 8...Rough forming roll 9...Finish forming reel 12...Support frame 13...Hollow piston 43.44...Gauge plate 57.58...Hydraulic motor

Claims (1)

[Claims] A pair of forming rolls are provided on a common support frame with the processing axis in between, and each forming roll is moved in the direction of the processing axis following a forming gauge. 10,000 is a rough forming roll and the other is a finishing forming roll, the rough forming roll is placed in front of the finishing forming roll by a required distance, and the drawing forming roll is given rotation in advance and comes into contact with the rotating material. The forming gauge for the forming roller allows the rough forming roll to dry-draw the material and the finishing forming roll to finish forming the blank-drawn material at the same time. A wheel forming method characterized by slowing down the speed according to the change in speed.