JPS5893535A - Method and device for forming rim - Google Patents

Abstract

PURPOSE:To reduce a decrease in thickness and to realize energy-saving formation of a rim without external damage by detecting pressure application and rotation states between a bottom roll and a top roll, and performing servocontrol so that they meet optinum conditins stored previously. CONSTITUTION:A rim blank ring 13 is clamped between a couple of bottom rolls 11 and 12 and pressed in an axial direction, and further pressure perpendicular to the axial direction is applied by a top roll 14. During this pressure application, pressure application states and rotation states between bottom rolls 11 and 12, and top roll 14 are derected by and transmitted from pressure encoders 25 and 55, speed encoders 27, 34, 57, and 64, and position encoders 28 and 58. Those data are compared by comparison operation parts 42 and 72 with optimum pressure application and rotation conditions stored previously in command parts 40 and 70 to bring the pressure application and rotation of the rolls 11 and 14 under servocontrol momentarily so that the optimum conditions are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for molding an annular IJ-mem, which is most suitable for use in molding a mem for automobile wheels, and an apparatus therefor.

Generally, as shown in Fig. 1, the rim of an automobile wheel is formed by applying pressure in the axial direction to the ring by holding it between a pair of bottom rolls 2 and 3, and at the same time applying a top roll 4 from above. It is done without pressing down. However, in the conventional forming method, - Tom roll 2.3 (
D press-in force.

Press-in speed, rotational force 1 rotation speed, top roll rolling blade, rolling speed, rotational force.

All rotational speeds were fixed and adjustable, so the required pressure, speed, and start of pressure on the top rail and bottom roll changed from moment to moment. It is not possible to optimize the timing of r, etc., and unnecessary rotational force is generated, causing slippage and damaging the rim during rim forming.In addition, unnecessary pressurized 0 rotations are preferable in terms of energy saving. The problem was that there was no.

In addition, in conventional rim forming, the lateral pressure from the bottom roll was applied to push and expand the end of the ring, and the emphasis was placed on forming the end section, which resulted in the optimal rim drop formation. The drop part of the rim is thicker and thinner, which could result in pressurization.
There were cases where this caused problems with the strength of the rim.

In order to solve the above-mentioned conventional problems, the present invention has been developed to improve the bottom roll and the top roll so as to reduce the phenomenon of flesh loss, avoid causing trauma to the rim, and save energy. Pressure.

The present invention provides a method and apparatus for controlling the rotation to match the optimum conditions by servo control and timing the press-fitting between both rolls.

The present invention will be explained below with reference to the drawings. Figure 2 shows a system 1 of a rim forming apparatus for carrying out the present invention. In Figure 0, 11 and 12 are a pair of bottom rolls; The annular element ring 13 is supported by being held between the bottom rolls 11 and 12. A pair of bottom ■-rules 11, 12
Upper part Ka) The tube roll 14 is movable up and down [K supported.

Among these, the top roll 14 is moved up and down by a top rule reduction cylinder 20. - The top roll 14 is raised to the top roll reduction cylinder 213.

A servo hydraulic circuit for lowering is connected,
m servo hydraulic circuit Fi, ) tube roll rise.

A lowering pump 21, a pressure servo valve n that controls the pressure of the pressure oil sent from the #pump 21 to control the pressurizing force of the top roll, and an increase in the pressure of the top mill pressure reduction cylinder.
It has a top roll raising/lowering solenoid that switches the lowering and a flow rate servo pulp that controls the top roller rolling speed. Further, the top roll reduction cylinder 20 is equipped with a pressure encoder 25, a cylinder rotation 26KFi speed encoder, and a position encoder, which detect and transmit the pressure and speed 1 position of the top roll reduction cylinder, respectively.

The top roll 14 is also rotationally driven by a top roll rotation hydraulic motor. The servo hydraulic circuit of the rotary hydraulic motor Kiku includes a top roll N-rotation pump 31, a pressure servo pulp 32 that controls the pressure of pressure oil sent from the M pump 31 to control the rotational force of the rotary hydraulic motor 30, and a top roll N-rotation pump 31. It has a servo pulp valve that controls the flow of pressure oil sent from the rotary pump 31 to control the rotation speed of the rotary hydraulic motor (9). In addition, top roll 14
A shaft KFi speed encoder U is attached to detect and transmit the rotational speed of the top roll 14.

Furthermore, the rim molding fold l1lK is provided with a servo control circuit for the top roll, and this control circuit
A command unit memorizes the optimum pressurizing force of the roll 14, pressurizing suzede, @ rolling force and sends it as a command signal, and pressurizing conditions of the top roll 14, that is, a pressure encoder 25. Speed encoder 27. A waveform shaping unit 41 that receives signals from the position encoder 28 and the rotational conditions, that is, the rotational speed encoder 34i, and shapes the waveform tube, and a comparison operation that compares and calculates the optimum signal from the signal tube command unit Xun from the waveform shaping unit 41. It has its own divisions and companies.

The signal from the comparison operation 1142 is amplified by an amplifier.

Pressure servo valve for raising and lowering, flow rate Suho Half 24. Pressure servo pulp for rotation32. It is sent to the flow lid servo pulp 33, and the pressurizing force, pressurizing position, and rotation of the top roll 14 are servo-controlled to optimal conditions.

On the other hand, at least one of the S metom rolls 11 and j2 is also provided with a circuit similar to that of the top roll 14. That is, for example, the bottom roll 11 is provided with a group of press-fit cylinders.

The press-fitting cylinder 50 moves the bottom roll 11 forward with respect to the opposing bottom roll ν. The rim element ring 13 is moved back and the lateral pressure pipe is applied. The servo circuit during the operation of the press-fitting cylinder includes a pump 51 for advancing and retracting bales from the bottom roll, a pressure servo valve 52 that increases or decreases the pressure of the pressure oil sent by the pump 51, and controls the pressurizing force of the bottom roll 11. Bottom roll forward movement that switches between cylinder forward and backward.

Retraction solenoid 53 and advancement of bottom roll 11, *
It has a flow rate servo pulp 8 that controls the retraction speed pipe. It was. Press fit l cylinder 50Ktf, pressure encoder 5
5. A speed encoder 57 and a position encoder are attached to the cylinder rod lever, which detect and transmit the pressing force and zero speed position of the bottom roll 11, respectively.

The bottom roll 11 is also rotatably driven by the bottom roll rotation hydraulic motor 60, and the servo hydraulic circuit of the zero rotation hydraulic motor ω controls the top roll rotation hydraulic pump 61 and the pressure of the pressure oil sent from the pump 61. It has a pressure servo pulp section that controls the rotational force of the rotary hydraulic motor ω, and a flow rate servo pulp section 8 and t that controls the flow of pressure oil sent from the bottom roll rotary pump 61 to control the rotation speed of the rotary hydraulic motor ω. ing. Further, a speed encoder 6 is attached to the shaft of the bottom roll 11 to detect and transmit the rotational speed of the bottom roll (1).

Furthermore, a servo control circuit is provided for the rim forming placement Ktj and the bottom roll, and this control circuit memorizes the optimal pressing force, pressing speed, 1 rolling force, and @ rolling speed of the bottom roll 11. command l5 to send it as a command signal
70, and a waveform shaping unit 71 that receives the pressure conditions of the bottom roll 11, that is, the pressure encoder 55°, the speed encoder 571, the position encoder group, and the rotation conditions, that is, the signal from the rotational speed encoder U, and shapes the waveform.

9. The waveform shaping 1171 signal is compared with the optimum signal from the command section 70, and a comparison operation I$72 is applied.9.
The signal from the comparison calculation unit 72 is amplified by the amplifier 73, and the signal is output from the pressure servo pulp 52 for side pressure. Pressure servo pulp shaft for flow rate servo valve 81 rotations.

The flow rate is sent to the servo pulp 63, and servo control is performed to the optimum conditions for one pressurization rotation t of the bottom roll 11.

Note that the command 11+40 for controlling the top roll 14 and the command section 70 for controlling the datom roll 11 are connected to each other, and preferably the bottom roll II
The top roll 1 is simultaneously pressurized with side pressure on the rubber ring 13 by K.
4 pressure is started, and at the same time as the bottom roll 11 finishes pressurizing, the top roll 14 finishes its downward stroke.

The pressurization of the top roll 14 is also related to the end. Figure 3 shows the bottom roll 11. This shows the relationship between the stroke of the top roll 14 and time.If the time difference between the final position of the stroke is taken as blood, the relationship between thickness loss and m was investigated, and it was found that the closer h is to OK, the smaller the thickness loss. The results were obtained. The reason why the above-mentioned final stroke time t is made the same for the bottom roll 11 and the top roll 14 is to reduce this self-destruction 9.

The rim forming method of the present invention is carried out as follows using the apparatus having the above-mentioned configuration.

That is, the rim ring 13t - the pair of bottom rolls 11
．． Hold between 12. Next, the top roll 14 applies pressure in a direction perpendicular to the axial direction together with a stone that presses in the axial direction with a pair of penta-rings 13t and 11.12 K rolls. In this pressurization, Metom p-le 11,1! The pressurized state and rotational state of the top sail 14 are detected, and these are sent to the command unit in advance.

Comparison calculations are made in the comparison calculation section 42.72 with the optimum pressurization conditions and rotation conditions stored in 70, and the bottom roll 11 and the bottom roll 14 are adjusted to match the optimum pressurization conditions and rotation conditions. The pressurization and one rotation are changed from moment to moment to form the hydrogen ring 13 from 1k under the control of the servo.

In addition, as mentioned above, in order to prevent self-destruction, the bottom roll 11
and the end/time of dog roll 14 are set to be the same.

The rim forming method of the present invention is constructed as described above, and the apparatus thereof is also constructed as described above.
Since it operates as described in the method, the following effects can be obtained when using zero-shot IjIiK.

First, the pressure of both the top and datom rolls and the 11th roll, which are involved in rim p-forming, are servo-controlled from time to time to the optimum conditions for forming, so they respond to over-forming. Also, there is less slippage between the roll and the product.

A more precise molding can be obtained, and it is possible to reduce the self-destruction of the R part with less titration, and at the same time, it is possible to prevent damage to the rim. It was. Since unnecessary pressure and rotation can also be avoided, the energy savings tIRt in rim forming can be reduced. Furthermore, by synchronizing the timing of the end of pressurization of the bottom roll and the top roll, it is possible to increase the effect of reducing internal loss by 9. It was. It also has the advantage of being able to be formed easily even if there are differences in plate thickness.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-section m showing a conventional rim molding state. FIG. 2 is a rim forming system diagram according to the present invention. Figure 3 is a pressurization timing diagram of the top roll and the mul roll according to the present invention. That is, , 11.12...1 bottom roll. 13... Rim elementary ring. 14...Tophole. 20...Top roll reduction cylinder. 22.32, 52.62-II...Pressure servo valve. 24, oh, 54. @Axis: Flow rate servo valve. 25.55...pressure crab y coder. 27.34.57.64 axis...Speed encoder. 28.58・O・・Position encoder. 30...Top roll rotation hydraulic pressure. 40, FuO@Work... Command Department. 72... Comparison and comparison calculation section. 50... is Tomroll's press-fit cylinder. 60... Bottom roll rotation hydraulic motor. Figure 1 1 Interosseous →

Claims (4)

[Claims] (1) In a rim forming method in which a circular rim is pressurized in the axial direction by a pair of bottom rails, and in a direction perpendicular to the axial direction by a tube roll, pressure is applied between the bottom roll and the top roll. The position and rotation condition are detected, and these are compared with pre-stored optimal pressurization conditions and rotation conditions, and the bottom a-rule is adjusted to match the optimum pressurization conditions and rotation conditions. A method for forming a rim in which pressurization and rotation of a top roll are service-controlled. (2) Scope of 4I Permissible Rust Requirement In the method for forming a limb described in item 1, the servo control marked with * starts applying pressure by pressing down the top opening at the same time as applying pressure by the bottom roll, and starts processing the bottom roll. Same as Layer r IIK) The rolling stroke of the tube roll is completed and the pressure application of the top roll is also completed. (3) A pressure device 2-rotation device for driving a bottom roll provided on a pair of bottom rolls that can move forward and backward, and a detection device that detects a pressurized state of the bottom roll 8 rotations 5tt. A pressurizing device that is installed on a top roll that can move up and down and drives the top roll. and a detection device that detects the pressurized state of the top roll and the state of one rotation. The signals from the bottom roll detection device and the top roll detection device are compared with the signal 7 from the command unit which stores the optimum pressure conditions for one rotation in advance in advance, and the bottom roll is pressurized. Placement, rolling equipment and top roll pressurizing equipment. and the Nervo control circuit that sends signals to the rotating equipment. Rim forming equipment consisting of. (4) In the rim forming apparatus according to claim 3, the signal from the command section of the sirl control circuit causes the pressurizing pipe to start due to top roll pressure at the same time as pressure is applied by the &) roll. . It is constructed so that the pressure by the top roll ends at the same time as the end of the pressure by the bottom roll.