KR20150091885A - Method for manufacturing tire wheel of heavy equipment vehicle - Google Patents

Abstract

The present invention relates to a method for manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine, and more particularly, to a process for manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine, A step of forming the rim through a pipe opening, an axial pipe and a cold forging after vertically inserting the circular pipe material between the upper and lower metal molds, a step of cutting the flange end of the rim, , A step of press-fitting a press-processed disk into the rim, a step of circumferentially welding the outer circumferences of both surfaces of the press-fitted disc to the inside of the rim, and a step of forming a coating film on the surface of the rim and the disc It is possible to manufacture a heavy-duty vehicle requiring a small-scale production of a small quantity of products in a simplified process and a greatly simplified facility compared to the conventional press and roll bending process And a method for manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine which makes it possible to manufacture a tire wheel for agricultural machinery more easily and easily so that domestic production of a tire wheel for a heavy equipment vehicle and an agricultural machine, will be.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tire manufacturing method for a heavy equipment vehicle,

The present invention relates to a method for manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine, and more particularly, to a process for manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine, A step of forming the rim through a pipe opening, an axial pipe and a cold forging after vertically inserting the circular pipe material between the upper and lower metal molds, a step of cutting the flange end of the rim, , A step of press-fitting a press-processed disk into the rim, a step of circumferentially welding the outer circumferences of both surfaces of the press-fitted disc to the inside of the rim, and a step of forming a coating film on the surface of the rim and the disc It is possible to manufacture a heavy-duty vehicle requiring a small-scale production of a small quantity of products in a simplified process and a greatly simplified facility compared to the conventional press and roll bending process And a method for manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine which makes it possible to manufacture a tire wheel for agricultural machinery more easily and easily so that domestic production of a tire wheel for a heavy equipment vehicle and an agricultural machine, will be.

Generally, tires used in heavy equipment vehicles and agricultural machinery including forklifts are classified into a solid rubber type in the form of a rubber tube and an air tube type tire in which an air tube is inserted.

As shown in FIG. 1, a tire wheel for mounting a conventional solid tire has a flange portion 31a at one end and a cylindrical ring rim 31b formed at an outer circumferential surface of the other end portion, (31), a disk-shaped disk (32) coupled to an inner circumferential surface of the rim (31), and a locking ring (31) coupled to the locking ring engagement groove portion (31b) after being inserted outside the other end of the rim And a sidewall 33 fixed by the sidewall 34. As shown in Fig.

In order to mount the solid tire 40 on the conventional tire wheel 30 constructed as described above, the solid tire 40 is inserted into the rim 31 having the flange 31a at one end thereof, The side ring 33 is inserted into the other end of the rim 31 in a state where the side ring 33 is inserted and then the locking ring 34 is engaged with the locking ring engagement groove 31b to fix the side ring 33, .

When forming the air vent hole 31c of the rim 31 provided in the conventional tire wheel 30 constructed as described above, an air tube type tire used for a heavy equipment vehicle including an existing forklift truck or an agricultural machine can be easily mounted .

However, unlike conventional tire wheels for general automobiles, which can be produced by a press and roll bending method in domestic as a mass production system of small items, the conventional tire wheels used in heavy equipment vehicles and agricultural machinery including forklifts as described above, As production is demanded, domestic production is impossible due to excessive initial investment, and all depend on imports.

Therefore, compared to the conventional press and roll bending method, it is possible to reduce the initial investment cost and the mold cost to enable domestic production of the heavy equipment vehicles including the forklift wheel and the wheel for the agricultural machinery, There is an urgent need to develop a tire wheel manufacturing technology for a vehicle and an agricultural machine.

The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a process for manufacturing a circular pipe material by bending a steel plate cut into a predetermined size into a circular pipe shape, A step of vertically inserting the circular pipe material between the upper and lower molds and then forming the rim through an expansion pipe, an axial pipe and a cold forging; a step of cutting the flange end of the rim; A step of press-fitting a press-processed disc, a step of circumferentially welding the outer circumferences of both surfaces of the press-fitted disc to the inside of the rim, and a step of forming a coating film on the surface of the rim and the disc, Compared with the press and roll bending method, the equipment is greatly simplified, and the tire wheel for heavy equipment vehicles and agricultural machinery, The technical problem is to enable domestic production of tire wheels for heavy equipment vehicles and agricultural machinery which can be manufactured more easily and easily, and which has been dependent on the import of the whole amount due to an initial investment cost.

According to another aspect of the present invention, there is provided a method of manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine, the method comprising: a bending step of bending an iron plate material cut to a predetermined size into a circular tube shape; And a lower end of the circular pipe material is expanded by lowering the upper mold after vertically inserting the circular pipe material formed through the linear welding process into the upper portion of the lower metal mold, The first molding roller is pressed against the outer circumferential surface of the circular tube material while rotating the circular tube material clamped between the lower molds together with the upper and lower molds to axially pipe the central portion of the circular tube material, The upper end of the round pipe material is axially pierced by bringing the cold forming roller into pressure contact with the outer peripheral surface of the round pipe material, The upper end of the circular pipe material is cold-pressed to press the secondary forming roller against the outer peripheral surface of the circular pipe material, and then the upper and lower portions of the circular pipe material are axially pressed to form a rim A step of cutting a flange end portion of a rim formed through the rim forming process, a disk press-fitting step of press-fitting the disc into the rim through the cutting process, A circumferential welding process for welding the outer peripheral edges of the both sides of the disk pressed into the inside of the rim and a coating process for forming a coating film on the surfaces of the rim and the disk after the circumferential welding process.

Further, the present invention is characterized in that a weld bead removing step for removing a weld bead formed in the joining portion of the circular pipe material formed through the linear welding process is added.

Further, the present invention is characterized in that an air vent hole piercing process for forming an air vent hole through a side surface of the rim having undergone the cutting process is added.

According to the method for manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine according to the present invention, which is configured as described above, it is possible to manufacture a tire wheel for a heavy equipment vehicle and an agricultural equipment requiring a small- It is possible to manufacture the tire wheel more easily and easily, which makes it possible to produce domestic tire wheels for heavy equipment vehicles and agricultural machinery, which have been dependent on the import of the entire amount due to the initial investment cost.

Brief Description of the Drawings Fig. 1 is an explanatory view showing a tire wheel used in a general heavy equipment vehicle and an agricultural machine.
2 is a block diagram showing a manufacturing process of a tire wheel for a heavy equipment vehicle and an agricultural machine according to the present invention.
Fig. 3 (a), (b) and (c) are explanatory views showing the bending process, the straight welding process and the welding bead removing process of the present invention.
4A to 4F are explanatory diagrams showing the rim forming process of the present invention.
5 is an explanatory view showing a cutting process of the present invention.
6 (a) and 6 (b) are explanatory diagrams showing the air vent hole piercing process of the present invention.
7 (A) and 7 (B) are explanatory diagrams showing the disk press-fitting process of the present invention.
8 is an explanatory view showing a circumferential welding process of the present invention.

Hereinafter, the present invention will be described in detail with reference to FIGS. 2 to 8. FIG.

The method for manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine according to the present invention is characterized in that the bending process 1, the straight welding process 2, the rim forming process 4, the cutting process 5, An indentation step (7), a circumferential welding step (8), and a coating step (9).

The bending process (1) is a process of bending a steel plate material (10) cut to a predetermined size into a circular tube shape in accordance with specification specifications by using a dedicated bending equipment as shown in , It is most important that the end portions of the bending operation are matched with no step difference due to the characteristics of the bending operation, and the concentricity of the worked bending type should be maintained within a certain range.

3 (B), the joining portion 10a of the steel plate 10 bent in a circular tube shape through the bending process 1 is welded to the circular tube As a process for manufacturing the material 12, there is a concern that a quality problem may occur when the welding state of the starting point and the end point is always unstable due to the nature of the welding operation. Therefore, various stoppers, This is the key to this technology.

As shown in FIG. 3 (c), after the straight welding step 2, the welding beads (not shown) formed in the joint portion 10a of the round tube material 12 formed through the straight welding step (2) It is preferable to add a weld bead removing step (3) for removing the weld bead 11.

When the welding bead removing step (3) is added as described above, a molding defect is generated on the welding part of the circular pipe material (12) during the expansion, axial and cold forging operations of the rim forming step (4) It can be effectively prevented.

The rim forming process (4) is a process for forming the round pipe material (12) manufactured through the above process into the rim (17), and the rim forming process (4) A forming step, a secondary shaft forming step, a cold forging forming step, and a third shaft forming step.

The expanding and molding step is a step for forming a flange portion 12a for preventing the separation of the solid type tire from the lower end portion of the circular tube material 12, and the straight welding step (2) is performed as shown in Fig. The upper mold 14 is lowered so as to press the circular pipe material 12 as shown in FIG. 4B, The flange portion 12a is formed at the lower end of the circular pipe material 12 by expanding the lower portion of the pipe material 12. [

The primary shaft tube forming step is a step for molding the rim base portion 12b which is in close contact with the inner circumferential surface of the solid tire at the center of the circular tube material 12, The primary molding roller 15 is attached to the outer peripheral surface of the circular tube material 12 while rotating the circular tube material 12 vertically clamped between the upper and lower molds 14 and 13 together with the upper and lower molds 14 and 13 The rim base portion 12b is formed at the center of the circular pipe material 12 by axially bending the central portion of the circular pipe material 12 while moving the upper portion and the lower portion with pressure.

The secondary shaft tube forming step is a step for molding a locking flange portion 12c for preventing the locking ring from separating from the upper end portion of the circular pipe material 12, 12 are press-contacted with the upper outer peripheral surface of the circular tube material 12 while the upper and lower molds 14, 13 are rotated together with the upper and lower molds 14, 13, The locking flange portion 12c is formed at the upper end of the pipe material 12. [

The cold forging is a step for molding a locking ring engagement groove 12d to which a locking ring is coupled to an upper outer circumferential surface of the round tube material 12, and the round tube material 12, as shown in FIG. The secondary molding roller 16 is brought into pressure contact with the upper outer circumferential surface of the circular pipe material 12 while rotating the upper and lower molds 14 and 13 together and the locking flange portion 12c of the circular pipe material 12 is rotated, The flange of the secondary shaping roller 16 press-contacts the pressure portion 16a to form the locking ring engagement groove portion 12d on the outer peripheral surface of the upper portion of the circular tube material 12. [

At this time, in order to form the locking ring engagement groove portion 12d on the outer circumferential surface of the circular pipe material 12 in the cold forging step, the secondary molding roller 16 is pressed against the outer peripheral surface of the circular pipe material 12, The reason for pressing the flange 16a of the secondary shaping roller 16 against the locking flange portion 12c of the circular pipe material 12 is that the secondary press roller 16 is pressed against the circular tube material It is intended to prevent the thickness of the locking ring engagement groove portion 12b from becoming thinner than the other portions in the process of forming the locking ring engagement groove portion 12d on the upper outer peripheral surface of the locking ring engagement groove portion 12b.

That is, when the secondary forming roller 16 is pressed in the horizontal direction in order to form the locking ring engagement groove 12d on the outer peripheral surface of the circular pipe material 12, the thickness of the locking ring engagement groove 12b When the flange of the secondary shaping roller 16 presses the locking flange portion 12c of the circular tube material 12 in the horizontal direction by using the pressing portion 16a, The thickness of the locking ring engagement groove portion 12b can be maintained to be the same as the other portions because the thickness of the locking ring engagement groove portion 12b is filled.

4F, the circular tubular material 12 is rotated together with the upper and lower molds 14 and 13 while the circular tubular tube 12 is rotated together with the upper and lower molds 14 and 13, The rim 17 is finally formed by causing the secondary molding roller 16 to come into pressure contact with the outer circumferential surface of the work 12 and moving the entire outer circumferential surface of the circular tube workpiece 12 to the axial position while moving the workpiece 12 up and down.

The cutting process 5 is a process for cutting the flange end of the rim 17 formed through the rim forming process 4 and uses a dedicated CNC cutting device to cut the rim 17, The flange end portions A and B of the rim 17 are cut while rotating the flange 17.

The reason for cutting the flange end portion of the rim 17 in the cutting process 5 is to make the appearance more beautiful and to determine the final dimensions of the product and accurately process the squareness and flatness of both ends of the rim 17 The disc 18 press-fitted into the rim 17 in the disc press-fit process 7 is accurately perpendicular to the inner circumferential surface of the rim 17 when the right angle and the flatness of the both ends of the rim 17 are correctly formed It becomes possible to press-fit.

At this time, the rim 17 having been subjected to the cutting process (5) is made for a solid type tire. If the rim 17 is to be manufactured for an air-tubular tire as required, 5) Next, as shown in (a) and (b) of FIG. 6, an air vent hole piercing step (a) for forming an air vent hole 17a through the side surface of the rim 17 after the cutting process (6) can be added.

The air vent hole piercing process 6 is a process in which the rim 17 having been subjected to the cutting process 5 is inserted vertically into the lower mold 21 of the press as shown in FIG. 6 (B), the intermediate mold 22 in the form of a cam is slid horizontally by the descent of the upper mold 23, and is guided to the intermediate mold 22 It is preferable that the mounted punch 22a is configured to process the air vent hole 17a on the side surface of the rim 17 vertically inserted into the lower mold 21. [

As the rim 17 passing through the cutting process 5 is inserted vertically into the lower mold 21, the punch of the intermediate mold 22 sliding in the horizontal direction along with the lowering of the upper mold 23 It is possible to prevent the roundness of the rim 17 from being deformed when the punch 22a pierces the air vent hole 17a.

The disk press-fitting step 7 is a step of press-fitting the disc 18 produced by press working into the rim 17 which has undergone the cutting step 5, and FIG. 7 (a) The rim 17 having been subjected to the cutting process 5 is inserted vertically into the lower mold 24 of the press and then the disc 18 is horizontally inserted into the upper portion of the inside of the rim 17, The upper mold 25 of the press is lowered to press the disk 18 into the inside of the rim 17 as shown in Fig. 7 (B).

At this time, the disc 18 must be press-fitted so as to be exactly perpendicular to the inner circumferential surface of the rim 17, because if the perpendicularity of the disc 18 is not accurately obtained, The ride comfort and the power transmission performance may be deteriorated.

It is preferable that the diameter of the disc 18 is slightly larger than the inner diameter of the rim base portion because if the diameter of the disc 18 is equal to or slightly smaller than the inner diameter of the rim base portion, So that the perpendicularity between the rim 17 and the disc 18 can be prevented from coming out due to the pulling of the portion.

The circumferential welding process 8 is a process of welding the rim 17 and the disk 18 together by welding the outer peripheral edges of the both surfaces of the disk 18 pressed into the rim 17 through the disk press- The disk 18 pushed into the rim 17 through the disk press-fitting process 7 as shown in Fig. 8 is transferred to the rotary shaft rotated by the servo motor 26 and the hydraulic cylinder 27a The disk 18 is moved to approach the outer periphery of both side surfaces of the disk 18 after approaching the welded soil 28a and 28b to the disk fixing device 27 which is moved back and forth by the servo motor 26, Slowly rotating, both sides simultaneous welding will proceed.

In this circumstance, in the circumferential welding process 8, the welding start point and welding end point must be accurately managed by the position sensor 29. In particular, one side of the disc 18 is corresponded to the air vent hole of the rim 17 The diameter and thickness of the disk 18 and the shape and size of the air vent hole are different for each wheel specification, so that the starting point and the ending point of the welding must be more accurately managed .

The painting step (9) is a step of forming a coating film on the surfaces of the rim (17) and the disc (18) through the circumferential welding step (8) At least 60 microns of coating film is formed by two or more electrodeposition coatings in order to extend the life of heavy duty vehicles and agricultural machinery wheels used in harsh working environments.

The manufacturing process of the tire wheel for the heavy equipment and the agricultural machine according to the present invention will be described as follows.

As shown in (a) and (b) of FIG. 3, the process of manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine according to the present invention includes bending a steel plate 10 cut into a predetermined size into a circular tube shape, The circular tube material 12 is manufactured by linearly welding the joint portion 11.

At this time, as shown in (c) of FIG. 3, if the weld bead 11 formed on the joint portion 10a of the circular pipe material 12 is removed, the rim shaping of the pipe, It is possible to effectively prevent the occurrence of molding defects on the welding portion of the circular pipe material 12 during the operation.

Then, the manufactured circular tube material 12 is inserted vertically into the upper portion of the lower mold 13 as shown in FIG. 4A, and then the circular tube material 12 is pressurized as shown in FIG. 4B, The upper mold 14 is lowered to expand the lower portion of the circular pipe material 12 to form the flange portion 12a at the lower end of the circular pipe material 12. [

Subsequently, as shown in FIG. 4C, a circular tube material 12 clamped vertically between the upper and lower molds 14 and 13 is rotated together with the upper and lower molds 14 and 13, The rim base portion 12b is formed in the center of the circular pipe material 12 by making the central portion of the circular pipe material 12 axially pipe while pressing the primary shaping roller 15 against the outer circumferential surface of the raw material 12, .

Subsequently, as shown in FIG. 4D, the circular tube material 12 is rotated together with the upper and lower molds 14 and 13, and a secondary forming roller 16 is attached to the upper outer circumferential surface of the circular tube material 12 The locking flange portion 12c is formed at the upper end of the circular pipe material 12 by pressing the upper portion of the circular pipe material 12 by axial compression.

Next, as shown in FIG. 4E, the circular pipe material 12 is rotated together with the upper and lower molds 14 and 13, and a secondary forming roller 160 is attached to the upper outer circumferential surface of the circular pipe material 12 The flange of the secondary shaping roller 16 is pressed against and brought into contact with the locking flange portion 12c of the circular tube material 12 so that the locking ring engagement groove portion 12a is formed on the outer peripheral surface of the circular tube material 12, (12d).

Subsequently, as shown in FIG. 4F, while the circular tube material 12 is rotated together with the upper and lower molds 14 and 13, the secondary molding roller 16 is pressed against the outer peripheral surface of the circular tube material 12 The rim 17 is formed by axially guiding the entire outer circumferential surface of the round pipe material 12 while moving it up and down.

Then, the flange end portions A and B of the rim 17 are cut as shown in Fig.

At this time, when the rim 17 is to be manufactured for an air tubular tire, the rim 17 is inserted vertically into the lower mold 21 of the press as shown in Fig. 6 (A) 6 (B), the upper mold 23 is lowered to slide the intermediate mold 22 in the horizontal direction so that the air vent hole 17a is formed in the side surface of the rim 17, .

Subsequently, as shown in FIG. 7 (a), the rim 17 is inserted vertically into the lower mold 24 of the press, and then the disc 18 is horizontally inserted into the inner upper portion of the rim 17 Next, as shown in Fig. 7 (B), the upper mold 25 of the press is lowered to press-fit the disc 18 into the rim 17.

Subsequently, the rim 17, into which the disc 18 is inserted, is inserted into a disc fixing device 27 (see FIG. 8) which is rotated forward and backward by a hydraulic cylinder 27a and a rotating shaft which is rotated by a servo motor 26, And then forming a coating film on the surfaces of the rim 17 and the disc 18 to manufacture a tire wheel for a heavy equipment vehicle and an agricultural machine, .

The method of manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine according to the present invention, which is constructed as described above, is a method of processing a circular pipe material having a pipe shape in a vertically standing state during a rim forming operation, The shape of the mold can be freely designed, and the thickness variation of the material can be minimized to produce a uniform product.

In addition, the method of manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine according to the present invention is a manufacturing method by cold forging, and it is possible to maintain the maximum durability by minimizing the thickness of a material, thereby improving durability by about 50% Not only the weight of the product but also the material cost can be greatly reduced.

Therefore, according to the method for manufacturing a tire wheel for a heavy equipment vehicle and an agricultural machine according to the present invention, compared to the conventional press and roll bending method which requires a production line length of at least 100 m, the equipment and the simplified process are greatly simplified, As it becomes easier and easier to manufacture tire wheels, it is possible to produce domestic tire wheels for heavy-duty vehicles and agricultural machinery, which have been dependent on imports because of excessive initial investment.

1: Bending process 2: Straight welding process
3: Weld bead removal process 4: Rim forming process
5: Cutting process 6: Air vent hole piercing process
7: Disc press-fitting process 8: Circumferential welding process
9: Coating process 10: Iron plate material
10a: joint part 11: welding bead
12: circular pipe material 12a: flange portion
12b: rim base portion 12c: locking flange portion
12d: Locking ring engagement groove portion 12e: Air vent hole
13: lower mold 14: upper mold
15: primary forming roller 16: secondary forming roller
16a: flange pressure 17: rim
17a: Air vent hole 18: Disk

Claims (3)

A bending process for bending a steel plate material cut to a predetermined size into a circular tube shape,
A straight welding step of welding a joint part of an iron plate material bent in a circular tube shape through the bending step,
The circular pipe material formed through the straight welding process is vertically inserted into the upper portion of the lower mold, the lower mold is lowered to expand the lower end portion of the circular pipe material, and the circular pipe material clamped between the upper and lower molds is moved up and down And the primary shaping roller is pressed against the outer circumferential surface of the circular tube material while being rotated together with the mold so that the central portion of the circular tube material is axially arranged and the secondary shaping roller is pressed against the outer circumferential surface of the circular tube material, The upper end portion of the circular pipe material is cold-forged by bringing the secondary forming roller into pressure contact with the upper outer circumferential surface of the circular pipe material and the upper end portion of the circular pipe material to press the secondary forming roller against the outer circumferential surface of the circular pipe material, A rim forming step of forming a rim by shrinking the entire outer circumferential surface of the circular pipe material,
A cutting process for cutting the flange end of the rim formed through the rim forming process,
A disk press-fitting step for press-fitting the disc into the rim after the cutting process,
A circumferential welding step of welding the outer peripheral edges of the both surfaces of the press-fitted disc to the inside of the rim through the disc press-
And a coating step of forming a coating film on the surface of the rim and the disk after the circumferential welding process. The method according to claim 1, further comprising a welding bead removing step of removing a welding bead formed in a joint part of a circular tube formed through the straight welding step. The method according to claim 1 or 2, further comprising an air vent hole piercing step of forming an air vent hole through the side surface of the rim that has undergone the cutting process.

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