Train wheel forming die forging upper forming device and assembling method

Abstract

The invention discloses a train wheel tire die forging upper forming device and an assembling method, the device comprises an upper die base and a thermal forming die, the thermal forming die comprises an upper core rod, an upper loop, an upper forming die and a forming ring structure, the upper core rod is movably sleeved with the upper loop, the forming ring structure is a forming ring assembly, and the forming ring assembly is connected with the upper die base. The forming ring assembly comprises a forming inner ring located on the inner side and a forming outer ring located on the outer side, the upper core rod, the upper forming die, the forming inner ring and the forming outer ring are sequentially positioned through step matching structures, and the forming outer ring is fixed to the upper die base through a fastener. The forming ring is of a split type structural design, the forming inner ring and the forming outer ring are combined to form the forming ring assembly, an inner cavity of the forming inner ring abuts against a hot state wheel blank, the forming outer ring only plays a role in fixing and supporting the forming inner ring in the working process, the forming outer ring in the forming ring assembly is long in service life and does not need to be replaced frequently, and the die cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of railway wheel forging, in particular to a railway wheel tire film forging forming device and an assembly method. Background Art

[0002] The production process of train wheels includes preforming, forming, rolling and bending punching. The preforming and forming processes adopt tire membrane forging. The tire membrane forging forming mechanism currently used includes an upper die seat, a hot forming die, an upper core rod pad used in conjunction with it, and a lower die seat matched with the upper die seat. The upper die seat is provided with a threaded hole along the central axis, and a flat-bottomed groove is opened along the center of its lower end face. The hot forming die includes an upper core rod, an upper looper, an upper forming die, a forming ring and an upper die ring. These hot forming die structures are integrated with the upper die seat. The upper forming die, the upper die ring and the forming ring are arranged in sequence from the inside to the outside along the radial direction, and the upper end face abuts against the groove opened at the lower end of the upper die.

[0003] The existing forming die structure has the following defects: 1) The forming ring is an integrated structure. As the largest tire membrane forging in the forming device of the entire wheel large tire membrane forging hydraulic press, the inner cavity of the forming ring abuts against the hot wheel blank, wears and deforms quickly, has a limited service life, and needs to be replaced regularly. However, due to its large size, the forging and processing of spare parts for the forming ring is difficult, the manufacturing cost of spare parts is high, and the overall replacement has a greater impact on the wheel manufacturing cost; 2) Due to structural design limitations, the radial positioning distance of the upper die seat to the forming ring is too close to the inner cavity of the forming ring. During the forming process of the wheel blank of the tire membrane forging hydraulic press, the shear force generated by the metal flow will cause the L-shaped forming ring to be prone to fatigue damage, which increases the frequency of replacement; 3) The forming ring is too large and too heavy, making it difficult to assemble, disassemble and lift.

[0004] For example, the patent CN112668108A discloses a forming mold forming method in a wheel process, which specifically includes the following steps: S1, automatically selecting matching parts for the forming blank from a general database, including a forming upper die seat, a forming upper die ring, a forming ring, an upper core rod pad, a forming lower die seat, a forming lower die ring, a forming lower die pressure ring, a forming lower die pad and a lower core rod sleeve; S2, automatically generating an upper core rod, a lower core rod, an upper looper, a lower looper, an upper forming die and a lower forming die based on the blank shape of the press-bent blank and the matching surfaces of the selected parts to form a forming mold; another example is the patent CN106391968A discloses a train tire membrane forging forming mechanism, including an upper die seat, a hot forming die, an upper core rod pad and a lower die seat matched with the upper die seat, the hot forming die including an upper core rod, an upper looper, an upper forming die, a forming ring and an upper die ring; both of its two tire membrane forging forming dies have the above-mentioned defects. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a railway tire membrane forging forming device and an assembly method to achieve the purpose of long service life and no need for frequent replacement.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A railway tire membrane forging forming device comprises an upper die seat and a hot forming die, the hot forming die comprises an upper core rod, an upper looper, an upper forming die and a forming ring structure, the upper looper is movably sleeved on the upper core rod, the forming ring structure is a forming ring assembly, the forming ring assembly comprises a forming inner ring located on the inner side and a forming outer ring located on the outer side, the upper core rod, the upper forming die, the forming inner ring and the forming outer ring are positioned in sequence by a step matching structure, and the forming outer ring is fixed to the upper die seat by a fastener.

[0008] A groove is provided at the center of the upper die seat, and an upper core rod pad for fixing the top of the upper core rod is provided in the groove, and the upper core rod pad is positioned by the upper forming die step.

[0009] The upper die seat is provided with a first step surface, a second step surface, a third step surface and a fourth step surface in sequence from the inside to the outside along the center of its lower end surface. The upper core rod pad cooperates with the first step surface, the upper forming die cooperates with the second step surface, the forming inner ring cooperates with the third step surface through the upper die ring, and the forming outer ring cooperates with the fourth step surface.

[0010] The upper core rod pad has a cylindrical cross section, and the upper core rod has a T-shaped cross section. Its shoulder head rides on the upper core rod pad, and the upper looper is movably connected in a closed annular cavity formed by the upper core rod and the upper forming die.

[0011] The upper forming die is provided with a first step, a second step, a third step and a first shoulder from the inside to the outside. The first step is set to limit the upper loop, the edge of the upper core rod pad abuts on the second step, the third step of the upper forming die abuts on the second step surface, the first shoulder abuts against the upper die ring, the lower part of the outer side surface of the upper forming die is gap-matched with the inner side surface of the upper die ring, the upper end surface of the upper die ring abuts on the third step surface and matches with the upper plane of the forming inner ring.

[0012] The molded outer ring is a boss-type structure, on which a fourth step, a fifth step and a sixth step are arranged from the inside to the outside, and the sixth step is provided with a through threaded hole corresponding to the threaded hole provided on the upper mold base; the upper end face of the upper mold ring is a plane, and the lower end face has a second shoulder, the inner side of the molded inner ring has a tread molding surface, the upper part is processed into a plane, and the outer side is provided with a third shoulder.

[0013] The second shoulder of the upper mold ring cooperates with the fifth step of the molded outer ring, the third shoulder of the molded inner ring abuts against the fourth step of the molded outer ring, the lower part of the outer side surface of the molded inner ring abuts against the inner side surface of the molded outer ring boss, and the sixth step of the molded outer ring abuts against the fourth step surface of the upper mold base.

[0014] The first step surface, the second step surface and the third step surface are all provided with wedge surfaces for automatic guiding and centering.

[0015] An assembly method for a train tire film forging forming device comprises the following steps:

[0016] Adopt the upward stacking assembly method, first put the lower die base on, and then put the forming outer ring, forming inner ring, upper die ring, upper forming die, upper looper, upper core rod pad, upper core rod, and upper die base on in turn. After putting them in place, pass the extended high-strength bolts through the through holes opened in the upper die base and fix them to the forming outer ring.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The forming ring adopts a split structure design, which is composed of a forming inner ring and a forming outer ring to form a forming ring assembly. The inner cavity of the forming inner ring abuts against the hot wheel blank, and the forming outer ring only plays a fixed supporting role for the forming inner ring during operation. The forming outer ring in the forming ring assembly has a long service life and does not need to be replaced frequently, which reduces the mold cost;

[0019] 2. The radial positioning distance between the upper die seat and the inner forming ring in the forming ring assembly is increased, which increases the ability of the L-shaped forming ring assembly to resist the shear force generated by the metal flow during the pressing process of the wheel blank, thereby extending the service life of the L-shaped forming ring assembly;

[0020] 3. The forming ring adopts a split structure design, which reduces the volume of the integrated forming ring structure, reduces the weight, facilitates the forging processing of the forming ring spare parts, and makes on-site assembly, disassembly and lifting simple and convenient, reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following is a brief description of the contents and symbols in the drawings of this specification:

[0022] Figure 1 It is a schematic diagram of the upper and lower molding mold structures of the present invention.

[0023] Figure 2 It is a schematic cross-sectional view of the upper forming mold structure of the present invention.

[0024] Figure 3 It is an exploded schematic diagram of the upper forming device of the present invention.

[0025] In the figure:

[0026] 1. upper die seat, 11. first step surface, 12. second step surface, 13. third step surface, 14. fourth step surface;

[0027] 2. hot forming die, 21. upper core rod, 22. upper looper, 23. upper forming die, 231. radial plate forming surface, 232. first step, 233. second step, 234. third step, 235. first shoulder, 24. forming ring assembly, 241. forming inner ring, 242. forming outer ring, 2411. tread forming surface, 2412. third shoulder, 2421. fourth step, 2422. fifth step, 2423. sixth step, 25. upper die ring, 251. forming outer ring boss;

[0028] 3. Upper core rod pad, 4. Lower die base. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0030] like Figures 1 to 3 As shown, the railway tire membrane forging forming device includes an upper die seat and a hot forming die. The hot forming die includes an upper core rod, an upper looper, an upper forming die and a forming ring structure. The upper looper is movably sleeved on the upper core rod. The forming ring structure is a forming ring assembly. The forming ring assembly includes a forming inner ring located on the inner side and a forming outer ring located on the outer side. The upper core rod, the upper forming die, the forming inner ring and the forming outer ring are positioned in sequence by a step matching structure, and the forming outer ring is fixed to the upper die seat by fasteners.

[0031] The forming ring in the forming device of the present invention adopts a split structure design, which is composed of a forming inner ring and a forming outer ring, which reduces the forging difficulty coefficient of the forming ring spare blank, reduces the manufacturing cost of the forming ring assembly spare parts, and at the same time prolongs the service life of the forming outer ring in the forming ring assembly that is non-contact with the red steel. In addition, the L-shaped forming ring assembly is increased to resist the shearing ability of the metal flow generated during the pressing process of the wheel blank, prolongs the service life of the L-shaped forming ring assembly, and reduces the mold cost. The device has a simple structure, is easy to install and disassemble, has a low manufacturing cost, and improves production efficiency.

[0032] Preferred embodiments of the present invention are:

[0033] The railway tire membrane forging forming device comprises an upper die base 1, a hot forming die 2, an upper core rod pad 3 and a lower die base 4 matched with the upper die base 1; the hot forming die 2 comprises an upper core rod 21, an upper looper 22, an upper forming die 23, a forming ring assembly 24 and an upper die ring 25, and the forming ring assembly 24 is composed of a forming inner ring 241 and a forming outer ring 242.

[0034] The feature is that the upper die seat 1 is provided with a first step surface 11, a second step surface 12, a third step surface 13 and a fourth step surface 14 along the center of the lower end surface; the upper core rod pad 3 is cylindrical in cross section, the upper core rod 22 is T-shaped in cross section, and its shoulder head rides on the upper part of the upper core rod pad 3; the upper looper 22 is movably connected in a closed annular cavity formed by the upper core rod 21 and the upper forming die 23;

[0035] The upper forming die 23 has a radial plate forming surface 231, a first step 232, a second step 233, a third step 234, and a first shoulder 235. The upper end surface of the upper die ring 25 is a plane, and the lower end surface has a second shoulder 251. The inner side of the forming inner ring 241 has a tread forming surface 2411, the upper part is processed into a plane, and the outer side is provided with a third shoulder 2412. The forming outer ring 242 is a boss-type structure, on which a fourth step 2421, a fifth step 2422, and a sixth step 2423 are processed. The sixth step 2423 is provided with a through threaded hole corresponding to the threaded hole provided on the upper die seat 1; the upper loop 22 is movably sleeved between the upper core rod pad 3 and the upper forming die 23, and the upper core rod pad 3 abuts against the first step surface 11 and the second step 233, the third step 234 of the upper molding die 23 abuts on the second step surface 12, the first shoulder 235 abuts against the upper mold ring 25, the lower part of the outer side surface of the upper molding die 23 is gap-matched with the inner side surface of the upper mold ring 25, the upper end surface of the upper mold ring 25 abuts on the third step 234 surface and matches with the upper plane of the molding inner ring 24, the second shoulder 251 matches with the fifth step 2422 of the molding outer ring 242, the third shoulder 243 of the molding inner ring 241 abuts on the fourth step 2421 of the molding outer ring, the lower part of the outer side surface of the molding outer ring 242 and the molding inner ring 241 abuts with the inner side surface of the molding outer ring boss 251, and the sixth step 2423 of the molding outer ring 242 abuts against the fourth step surface 14 of the upper mold base.

[0036] The first step surface 11, the second step surface 12 and the third step surface 13 are all provided with wedge surfaces, wherein the angle of the wedge surface of the first step surface 11 is 20°, the angle of the wedge surface of the second step surface 12 is 15°, and the angle of the wedge surface of the third step surface 13 is 15°, and the wedge surfaces play a guiding role in automatic guiding and centering.

[0037] The upper die seat 1 is provided with a plurality of symmetrically arranged through holes, and the extended high-strength bolts pass through the upper die seat and are fastened with the through threaded holes of the forming outer ring. The countersunk depth of the through hole matches the length of the bolt head, and the outer diameter of the countersunk hole matches the bolt fastening.

[0038] The assembly method of the railway tire film forging forming device of the present invention comprises the following steps:

[0039] Adopt the upward stacking assembly method, first put the lower die base on, and then put the forming outer ring, forming inner ring, upper die ring, upper forming die, upper looper, upper core rod pad, upper core rod, and upper die base on in turn. After putting them in place, pass the extended high-strength bolts through the through holes opened in the upper die base and fix them to the forming outer ring.

[0040] The forming ring of the present invention adopts a split structural design, and is composed of a forming inner ring and a forming outer ring to form a forming ring assembly. The inner cavity of the forming inner ring abuts against the hot wheel blank, and the forming outer ring only plays a fixing and supporting role for the forming inner ring during operation. The forming outer ring in the forming ring assembly has a long service life and does not need to be replaced frequently, thereby reducing the mold cost; the radial positioning distance between the upper mold seat and the forming inner ring in the forming ring assembly is increased, and the L-shaped forming ring assembly is increased to resist the shear force generated by the metal flow during the pressing process of the wheel blank, thereby extending the service life of the L-shaped forming ring assembly; the forming ring adopts a split structural design, which reduces the volume of the integrated forming ring structure, reduces the weight, facilitates the forging and pressing of the forming ring spare blank, and makes on-site assembly, disassembly and lifting simple and convenient, thereby reducing the production cost.

[0041] The above is only an explanation of the preferred embodiments of the present invention, and the above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0042] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A train tire film forging forming device, comprising an upper die seat and a thermoforming die, wherein the thermoforming die comprises an upper core rod, an upper looper, an upper forming die and a forming ring structure, wherein the upper looper is movably mounted on the upper core rod, and wherein: The molding ring structure is a molding ring assembly, which includes a molding inner ring located on the inner side and a molding outer ring located on the outer side. The upper core rod, upper molding die, molding inner ring and molding outer ring are positioned in sequence through a step matching structure, and the molding outer ring is fixed to the upper die seat by fasteners.

2. The railway tire film forging forming device as claimed in claim 1, characterized in that: A groove is provided at the center of the upper die seat, and an upper core rod pad for fixing the top of the upper core rod is provided in the groove, and the upper core rod pad is positioned by the upper forming die step.

3. The railway tire film forging forming device as claimed in claim 2, characterized in that: The upper die seat is provided with a first step surface, a second step surface, a third step surface and a fourth step surface in sequence from the inside to the outside along the center of its lower end surface. The upper core rod pad cooperates with the first step surface, the upper forming die cooperates with the second step surface, the forming inner ring cooperates with the third step surface through the upper die ring, and the forming outer ring cooperates with the fourth step surface.

4. The railway tire film forging forming device as claimed in claim 3, characterized in that: The cross section of the upper core rod pad is cylindrical, the cross section of the upper core rod is T-shaped, the shoulder head of the upper core rod pad rides on the upper part of the upper core rod pad, and the upper looper is movably connected in the closed annular cavity formed by the upper core rod and the upper forming mold.

5. The railway tire film forging forming device as claimed in claim 4, characterized in that: The upper forming die is provided with a first step, a second step, a third step and a first shoulder from the inside to the outside. The first step is set to limit the upper loop, the edge of the upper core rod pad abuts on the second step, the third step of the upper forming die abuts on the second step surface, the first shoulder abuts against the upper die ring, the lower part of the outer side surface of the upper forming die is gap-matched with the inner side surface of the upper die ring, the upper end surface of the upper die ring abuts on the third step surface and matches with the upper plane of the forming inner ring.

6. The railway tire film forging forming device as claimed in claim 5, characterized in that: The molded outer ring is a boss-type structure, on which a fourth step, a fifth step and a sixth step are arranged from the inside to the outside, and the sixth step is provided with a through threaded hole corresponding to the threaded hole provided on the upper mold base; the upper end face of the upper mold ring is a plane, and the lower end face has a second shoulder, the inner side of the molded inner ring has a tread molding surface, the upper part is processed into a plane, and the outer side is provided with a third shoulder.

7. The railway tire film forging forming device as claimed in claim 6, characterized in that: The second shoulder of the upper mold ring cooperates with the fifth step of the molded outer ring, the third shoulder of the molded inner ring abuts against the fourth step of the molded outer ring, the lower part of the outer side surface of the molded inner ring abuts against the inner side surface of the molded outer ring boss, and the sixth step of the molded outer ring abuts against the fourth step surface of the upper mold base.

8. The railway tire membrane forging forming device as claimed in claim 7, characterized in that: The first step surface, the second step surface and the third step surface are all provided with wedge surfaces for automatic guiding and centering.

9. An assembly method for the railway tire film forging forming device as claimed in claim 8, characterized in that: The assembly method comprises the following steps: Adopt the upward stacking assembly method, first put the lower die base on, and then put the forming outer ring, forming inner ring, upper die ring, upper forming die, upper looper, upper core rod pad, upper core rod, and upper die base on in turn. After putting them in place, pass the extended high-strength bolts through the through holes opened in the upper die base and fix them to the forming outer ring.

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