WO2006137609A1

WO2006137609A1 - Method of manufacturing two kinds of stabilizer bars simultaneously

Info

Publication number: WO2006137609A1
Application number: PCT/KR2005/001958
Authority: WO
Inventors: Uei-Zhon La; Chan-Gi Jung
Original assignee: Dae Won Kang Up Co., Ltd.
Priority date: 2005-06-23
Filing date: 2005-06-23
Publication date: 2006-12-28

Abstract

An apparatus and method for SFBC coding and decoding in a communication system using a plurality of (N ) Tx antennas are provided. In a transmitter using N transmit antennas, a pre-coder pre-codes an input symbol sequence using a pre-coding matrix. The pre-coding matrix is produced by puncturing a unitary matrix in a predetermined method. An encoder generates a plurality of vectors by grouping the symbols of the pre-coded symbol sequence by twos, space-frequency maps each of the vectors by encoding each of the vectors in an Alamouti coding scheme, and provides each of the space-frequency mapped symbols to a predetermined OFDM modulator.

Description

METHOD OF MANUFACTURING TWO KINDS OF STABILIZER BARS SIMULTANEOUSLY

Technical Field

[1] The present invention relates, in general, to methods of manufacturing stabilizer bars and, more particularly, to a method of simultaneously manufacturing two kinds of stabilizer bars using only one manufacturing line.

[2]

Background Art

[3] As well known to those skilled in the art, stabilizers are torsion roll springs which are provided to front and rear wheels of vehicles to prevent vehicle bodies from rolling. In such a stabilizer, a torsion bar is coupled at opposite ends thereof to left and right suspensions (typically, lower arms of suspensions). Furthermore, only when left and right wheels move differently is the stabilizer operated. For example, when a vehicle corners, outside wheels bump while inside wheels rebound. At this time, the stabilizer controls the motion of left and right wheels, thus preventing the vehicle from rolling.

[4] Typically, a stabilizer bar is formed into a single body and has a U shape to minimize interference with lower control arms and other elements. However, in the case of racing vehicles and experimental vehicles, stabilizer bars in which torsion bars and arms are separately mounted to vehicles may be used. In order to obtain the optimum roll rate, diameters of stabilizer bars have been changed.

[5] Recently, in the case of passenger vehicles, suspension springs having low spring constants are used so as to provide a smooth comfortable ride. Furthermore, to prevent vehicles from rolling due to a reduced spring constant, stabilizer bars having a variety of type have been proposed. In particular, active stabilizer bars, which have structures in which roll rates may be arbitrarily adjusted to ensure driving stability, and on/off stabilizer bars, which have structures capable of determining whether a stabilizer bar is functioning, are being developed.

[6] In the process of producing such stabilizer bars, peeling bars to be machined and methods of bending the peeling bars differ according to the shape of stabilizer bars. However, in conventional methods of manufacturing stabilizer bars, one manufacturing line can manufacture only one kind of stabilizer bar. In other words, to manufacture various kinds of stabilizer bars, several stabilizer bar manufacturing lines are required. Therefore, conventional stabilizer bar manufacturing methods are problematic in that the space for installation of manufacturing lines is increased, and the efficiency of the manufacturing lines is reduced, and increased equipment costs impose a heavy burden on users. [7]

Disclosure of Invention

Technical Problem

[8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a method of simultaneously manufacturing two kinds of stabilizer bars using only one manufacturing line, thus preventing the use of redundant equipment, simplifying a manufacturing line, reducing economic burden, and having increased production efficiency. Technical Solution

[9] In order to accomplish the above object, the present invention provides a method of manufacturing two kinds of stabilizer bars simultaneously, including: loading first and second peeling bars to be machined at different positions on a carrying beam using two palletizers which operate independently; supplying the carrying beam, on which the first and second peeling bars are loaded, into a heating furnace to heat the first and second peeling bars; carrying the heated first and second peeling bars to first and second conveyors, respectively; detecting the first and second peeling bars, carried to the first and second conveyors, using first and second sensors, respectively; conveying the first and second peeling bars to first and second bending machines using the first and second conveyors which are operated by the first and second sensors, respectively; bending the first and second peeling bars using the first and second bending machines, thus forming first and second stabilizer bars having different shapes according to preset values of the first and second bending machines, respectively; supplying the first and second stabilizer bars into an annealing tank according to a sequence of processing the first and second stabilizer bars, thus annealing the first and second stabilizer bars; identifying the kind of annealed stabilizer bar according to a sequence in which the first and second stabilizer bars are carried, and loading the first and second stabilizer bars on first and second sides of a bucket by a distributive loading machine, respectively; and transferring the bucket, on which the first and second stabilizer bars are loaded, to a tempering process using a bucket transfer conveyor so as to temper the first and second stabilizer bars and outputting the first and second stabilizer bars.

[10]

Brief Description of the Drawings

[11] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[12] FIG. 1 is a front view of equipment for simultaneously manufacturing two kinds of stabilizer bars to show a manufacturing flow, according to a preferred embodiment of the present invention;

[13] FIG. 2 is a view showing an enlargement of a circled portion B of FIG. 1; and

[14] FIG. 3 is a plan view of the equipment of FIG. 1 to show the stabilizer bar manufacturing flow.

[15]

Best Mode for Carrying Out the Invention

[16] Reference should now be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components.

[17] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a front view of equipment for simultaneously manufacturing two kinds of stabilizer bars to show a manufacturing flow, according to a preferred embodiment of the present invention. FIG. 2 is a view showing an enlargement of a circled portion B of FIG. 1. FIG. 3 is a plan view of the equipment of FIG. 1 to show the stabilizer bar manufacturing flow. In the present invention, two kinds of stabilizer bars are simultaneously manufactured through a thermal treatment process of heating peeling bars in a heating furnace after loading the peeling bars on a carrying beam using two palletizers; a process of carrying the thermally treated peeling bars using conveyors and a carrying robot and of bending the peeling bars using bending robots, thus forming two kinds of stabilizer bars; a process of supplying the stabilizer bars into an annealing tank using the carrying robot, thus annealing the stabilizer bars; a process of tempering the annealed stabilizer bars while carrying them using a bucket transfer conveyor after loading the stabilizer bars on a bucket using the carrying robot; and a process of outputting the tempered stabilizer bars. In detail, as shown in FIGS. 1 through 3, different kinds of first and second peeling bars 210 and 220 are loaded at different positions on a carrying beam 310 by first and second palletizers 110 and 120 and are thermally treated. Subsequently, the first and second peeling bars 210 and 220 are carried to a machining process. At this time, positions of the first and second peeling bars 210 and 220 are detected by first and second sensors 410 and 420, respectively. First and second conveyors 450 and 460, which are coupled to first and second bending robots 430 and 440, are operated by the first and second sensors 410 and 420, respectively. Thus, the first and second peeling bars 210 and 220 are carried to the first and second bending robots 430 and 440 by the first and second conveyors 450 and 460. The first and second bending robots 430 and 440 machine the first and second peeling bars 210 and 220, thus forming first and second stabilizer bars 230 and 240, respectively. Thereafter, the machined first and second stabilizer bars 230 and 240 are annealed and loaded at different positions on a bucket 610 according to the kind of stabilizer bar by a distributive loading robot 510. Here, the kind of the annealed first or second stabilizer bar 230 or 240 is known by the sequence in which the first and second stabilizer bars 230 and 240 are carried. Subsequently, the bucket 610, on which the first and second stabilizer bars 230 and 240 are loaded, is transferred to a tempering process by a bucket transfer conveyor so as to temper the first and second stabilizer bars 230 and 240. The tempered first and second stabilizer bars 230 and 240 are output thereafter.

[18] The first and second palletizers 110 and 120, which are placed to be symmetric to each other, carry the first and second peeling bars 210 and 220 to the carrying beam 310 of heat treatment process. At this time, the first and second palletizers 110 and 120 are alternately operated to prevent interference between them. Furthermore, the first and second palletizers 110 and 120 load the first and second peeling bars 210 and 220 on the carrying beam 310 such that the first and second peeling bars 210 and 220 alternate or the ends of the first and second peeling bars 210 and 220 are placed at different positions.

[19] The bending robots 430 and 440 are also symmetric to each other. The bending robots 430 and 440 machine the first and second peeling bars 210 and 220 into the first and second stabilizer bars 230 and 240 having different shapes according to preset values, respectively.

[20] The first and second conveyors 450 and 460 respectively carry heat treated first and second peeling bars 210 and 220 to positions at which the first and second stabilizer bars 230 and 240 are formed. The first and second conveyors 450 and 460 are operated in opposite directions (toward the first and second bending robots 430 and 440, respectively). The first and second sensors 410 and 420 are provided at predetermined positions of the first and second conveyors 450 and 460, respectively.

[21] Furthermore, the first and second sensors 410 and 420 detect whether the first and second stabilizer bars 230 and 240 are supplied to the first and second conveyors 450 and 460, respectively. The first and second conveyors 450 and 460 are operated when the first and second stabilizer bars 230 and 240 are detected by the first and second sensors 410 and 420, respectively. That is, the first and second peeling bars 210 and 220, which are loaded on the carrying beam 310, are heat treated and carried to the first and second conveyors 450 and 460 of the machining process, respectively. At this time, the first and second peeling bars 210 and 220, which are carried to the first and second conveyors 450 and 460, are detected by the first and second sensors 410 and 420, which are provided at the predetermined positions of the first and second conveyors 450 and 460, respectively. Here, because the first and second peeling bars 210 and 220 are loaded at different positions on the carrying beam 310, the first and second sensors 410 and 420 can respectively detect the first and second peeling bars 210 and 220. The peeling bar is identified as a first or second peeling bar 210 or 220 by the sensing signal of the first and second sensors 410 and 420. Thereafter, the first or second conveyor 450 or 460 is operated according to the kind of peeling bar. Thus, the first and second peeling bars 210 and 220 are supplied to the first and second bending robots 430 and 440, respectively. The first and second peeling bars 210 and 220 are machined by the first and second bending robots 430 and 440 into the first and second stabilizer bars 230 and 240, respectively. The first and second stabilizer bars 230 and 240, which are formed from the first and second peeling bars 210 and 220, are transferred to an annealing tank 520 of the annealing process and are annealed in the annealing tank 520.

[22] The first and second stabilizer bars 230 and 240, which passed through the annealing process, are loaded in the bucket 610 by the distributive loading robot 510 at different positions (first and second positions) according to the kind of stabilizer bar. That is, the kind of peeling bar is identified by the first or second sensor 410 and 420, before the first and second stabilizer bars 230 and 240 formed using the first and second peeling bars 210 and 220 are annealed. Furthermore, the sequence in which the first and second peeling bars 210 and 220 are sensed is the same as the sequence in which the first and second stabilizer bars 230 and 240 are carried. Therefore, the distributive loading robot 510 can load the first and second stabilizer bars 230 and 240 on the bucket 610 at different positions according to the kind of stabilizer bar identified by the sequence in which the first and second stabilizer bars 230 and 240 are carried.

[23] Here, twenty-four first and second stabilizer bars 230, 240 can be loaded in one bucket 610. The bucket 610, in which twenty-four first and second stabilizer bars 230, 240 are loaded, is transferred to a tempering furnace 630 of the tempering process by a bucket transfer conveyor 620. Thus, the first and second stabilizer bars 230 and 240 are tempered and output through an output line 700.

[24] As such, in the present invention, the first and second palletizers 110 and 120, the first and second conveyors 450 and 460 and the first and second bending robots 430 are placed symmetric to each other. Furthermore, the first and second stabilizer bars 230 and 240 are loaded on the bucket 610 by the distributive loading robot 510 at different positions according to the sequence in which the first and second stabilizer bars 230 and 240 are sensed by the first and second sensors 410 and 420.

[25] In brief, the stabilizer bar manufacturing method of the present invention includes the step of loading the first and second peeling bars to be machined at different positions on the carrying beam using two palletizers which operate independently; and the step of supplying the carrying beam, on which the first and second peeling bars are loaded, into the heating furnace to heat treat the first and second peeling bars. The stabilizer bar manufacturing method further includes the step of carrying the heat treated first and second peeling bars to the first and second conveyors, respectively; and the step of detecting the first and second peeling bars, carried to the first and second conveyors, using first and second sensors, respectively. The stabilizer bar manufacturing method further includes the step of conveying the first and second peeling bars to first and second bending robots using the first and second conveyors which are operated by the first and second sensors, respectively; and the step of bending the first and second peeling bars using the first and second bending robots, thus forming the first and second stabilizer bars having different shapes according to preset values of the first and second bending robots, respectively. The stabilizer bar manufacturing method further includes the step of sequentially supplying the first and second stabilizer bars into the annealing tank according to the sequence of processing the first and second stabilizer bars, thus annealing the first and second stabilizer bars. The stabilizer bar manufacturing method further includes the step of identifying the kind of the annealed stabilizer bar, the step of the distributive loading robot loading the first and second stabilizer bars on first and second sides of the bucket, respectively; and the step of transferring the bucket, on which the first and second stabilizer bars are loaded, to the tempering process using the bucket transfer conveyor so as to temper the first and second stabilizer bars and outputting the first and second stabilizer bars. The present invention can produce two different kinds of stabilizer bars using only one manufacturing line through the above-mentioned process.

[26]

Industrial Applicability

[27] As described above, the present invention provides a method of simultaneously manufacturing two kinds of stabilizer bars using only one manufacturing line, thus being suitable for manufacturing multiple kinds of products in small quantities. Furthermore, in the present invention, because two palletizers and bending robots are alternately operated, the continuity of the operation is ensured. Therefore, production efficiency increases.

[28] Moreover, due to the simplicity of the manufacturing line, the present invention can gain a spatial advantage. As well, the present invention prevents use of redundant equipment, thus reducing installation costs.

[29] Although the preferred embodiment of the present invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

[1] A method of manufacturing two kinds of stabilizer bars simultaneously, comprising: loading first and second peeling bars to be machined at different positions on a carrying beam using two palletizers which operate independently; supplying the carrying beam, on which the first and second peeling bars are loaded, into a heating furnace to heat the first and second peeling bars; carrying the heated first and second peeling bars to first and second conveyors, respectively; detecting the first and second peeling bars, carried to the first and second conveyors, using first and second sensors, respectively; conveying the first and second peeling bars to first and second bending machines using the first and second conveyors which are operated by the first and second sensors, respectively; bending the first and second peeling bars using the first and second bending machines, thus forming first and second stabilizer bars having different shapes according to preset values of the first and second bending machines, respectively; supplying the first and second stabilizer bars into an annealing tank according to a sequence of processing the first and second stabilizer bars, thus annealing the first and second stabilizer bars; identifying the kind of annealed stabilizer bar according to a sequence in which the first and second stabilizer bars are carried, and loading the first and second stabilizer bars on first and second sides of a bucket by a distributive loading machine, respectively; and transferring the bucket, on which the first and second stabilizer bars are loaded, to a tempering process using a bucket transfer conveyor so as to temper the first and second stabilizer bars and outputting the first and second stabilizer bars.