CN-224208906-U - Mould core movable type hydraulic expansion mould

CN224208906UCN 224208906 UCN224208906 UCN 224208906UCN-224208906-U

Abstract

The utility model discloses a mold core movable hydraulic expansion mold, which comprises an upper mold set and a lower mold set, wherein the upper mold set comprises an upper mold, the lower mold set comprises a lower mold, an upper mold cavity is formed by the upper mold, a lower mold cavity is formed by the lower mold, a final molding cavity for accommodating a preformed pipe blank is formed by combining the upper mold cavity and the lower mold cavity in a opposite mode, so as to form the final molded pipe blank by stamping, an inclined top insert capable of floating up and down is arranged in the middle of the lower mold cavity in the lower mold, and the end face of the propping top end of the inclined top insert is matched with the concave-convex lower surface of a bulge part of the final molded pipe blank. The utility model adopts the structure that the two ends are fixed and not floating, the middle part is movably punched through the inclined top insert and the inside and outside cooperation of high-pressure liquid expansion, so that the pipe blank is completely stuck to the die, the cracking problem caused by uneven wall thickness is effectively avoided, and the rejection rate is reduced.

Inventors

LI BO
LI JINGMING
XU ZHIGAO

Assignees

佛山市正和液压控制技术有限公司

Dates

Publication Date: 20260508
Application Date: 20250604

Claims (10)

1. The die core movable hydraulic expansion die is characterized by comprising an upper die set and a lower die set, wherein the upper die set comprises an upper die set, the lower die set comprises a lower die set, the upper die set forms an upper die cavity, the lower die set forms a lower die cavity, the upper die cavity is opposite to the lower die cavity and is combined to form a final forming cavity for accommodating a preformed tube blank so as to form the final forming tube blank by stamping, an inclined top insert capable of floating up and down is arranged in the middle of the lower die set, and the end face of the propped top end of the inclined top insert is matched with the concave-convex lower surface of a bulge part of the final forming tube blank.
2. The die core moving type hydraulic expansion die of claim 1, wherein a middle lower die block is further arranged in the middle of the lower die cavity in the lower die, a bulge cavity is formed on the upper surface of the middle lower die block, an inclined through groove is formed on the middle lower die block, the through groove penetrates through the bulge cavity surface formed by the middle lower die block, the through groove is movably connected with the inclined top insert, one end of the inclined top insert is connected with a telescopic rod of a driving device, the other end of the inclined top insert stretches into the through groove, the other end of the inclined top insert is the propped top end of the inclined top insert, and the propped top end of the inclined top insert can further stretch into the bulge cavity formed by the middle lower die block from the through groove under the driving of the driving device.
3. The die core moving hydraulic expansion die according to claim 2, wherein the number of the inclined top inserts is two, correspondingly, the number of the through grooves is two, and the axial lines of the two through grooves intersect in a bulge cavity formed by the middle and lower modules.
4. The die core moving hydraulic expansion die of claim 2, wherein said lower die further comprises a lower die base, said lower die further comprises a left lower die block and a right lower die block, said left lower die block and right lower die block are positioned on both sides of said middle lower die block, and said left lower die block, middle lower die block and right lower die block are integrally formed with said lower die base.
5. The die core moving hydraulic expansion die of claim 1, wherein said upper die set further comprises an upper die base, said upper die being mounted by said upper die base, said upper die comprising an upper left die block, an upper middle die block set and an upper right die block, said upper left die block and said upper right die block being located on either side of said upper middle die block set.
6. The die core moving hydraulic expansion die according to claim 5, wherein the upper die base is provided with a left cavity, a middle cavity and a right cavity, and the left upper die block, the middle upper die block group and the right upper die block are respectively correspondingly installed.
7. The die core moving hydraulic expansion die of claim 6, wherein said left cavity is provided with a first spring set, two ends of each spring of said first spring set respectively abut against said upper left die block and said upper die block, and said right cavity is provided with a second spring set, two ends of each spring of said second spring set respectively abut against said upper right die block and said upper die block.
8. The die core moving hydraulic expansion die according to claim 5, wherein said upper middle die block group comprises an upper middle die block, four upper punches and two stoppers, said four upper punches are disposed around said upper middle die block, wherein two upper punches are connected to said upper left die block on two radial sides of a half-tubular cavity formed by the upper left die block, said two upper punches are left upper punches, the other two upper punches are connected to said upper right die block on two radial sides of a half-tubular cavity formed by the upper left and right die blocks, said two upper punches are right upper punches, and each stopper is disposed between said upper left punch and said upper right punch on the same side, so that said upper middle die block, said four upper punches and said two stoppers are disposed around to form a bulge cavity.
9. The die core moving hydraulic expansion die according to claim 8, wherein the surfaces of said four upper punches for forming the cavity are partially concaved inward to form inclined surfaces at the positions engaged with said upper left or right die block for punching out the engagement positions between the contracted pipe portions and the bulged portions of said final-formed tube blank.
10. The die core moving hydraulic expansion die of claim 1, further comprising two liquid blocking plugs disposed on opposite sides of the upper die set and the lower die set, respectively.

Description

Mould core movable type hydraulic expansion mould Technical Field The utility model relates to the technical field of metal workpiece machining, in particular to a die core movable hydraulic expansion die. Background The hollow structural member is made by placing a tube blank of a certain length into a die, and under the action of internal liquid (liquid or oil) pressure, controlling the internal pressure to expand the tube blank outwards along the radial direction to generate plastic deformation. However, some materials are difficult to form due to the physical characteristics of the materials, for example, the axle housing product is made of carbon steel, the expansion coefficient is low due to the limitation of the performance of the materials, the axle housing product is of a large-section abnormal complex structure, and particularly, the lower rear cover part has a plurality of right-angle small-radius corner structures, so that the axle housing product can not be formed due to cracking and the like. According to the general expansion process, the material is stagnant due to the right-angle corner structure during molding, so that the material cannot continue to be expanded and stretched, and otherwise, the material is broken. Disclosure of utility model In order to solve the technical problems in the prior art, the utility model aims to provide a die core moving type hydraulic expansion die, and the manufactured axle housing product has uniform wall thickness and is not easy to crack. The die core movable hydraulic expansion die comprises an upper die set and a lower die set, wherein the upper die set comprises an upper die set, the lower die set comprises a lower die set, the upper die set forms an upper die cavity, the lower die set forms a lower die cavity, the upper die cavity and the lower die cavity are opposite and combined to form a final forming cavity for accommodating a preformed tube blank so as to form the final forming tube blank by stamping, an inclined top insert capable of floating up and down is arranged in the middle of the lower die set, and the end face of the propping top end of the inclined top insert is matched with the concave-convex surface of the lower surface of the bulge part of the final forming tube blank. Further, a middle lower module is arranged in the middle of the lower mold cavity, a bulge cavity is formed on the upper surface of the middle lower module, an inclined through groove is formed on the middle lower module, the through groove penetrates through the bulge cavity surface formed by the middle lower module, the through groove is movably connected with the inclined top insert, one end of the inclined top insert is connected with a telescopic rod of a driving device, the other end of the inclined top insert stretches into the through groove, the stretching end is the propping end of the inclined top insert, and the propping end of the inclined top insert can stretch into the bulge cavity formed by the middle lower module from the through groove under the driving of the driving device. Specifically, the number of the inclined top inserts is two, correspondingly, the number of the through grooves is also two, and the axial lines of the two through grooves are intersected in a bulge cavity formed by the middle and lower modules. Further, the lower die set still includes the die holder, the lower die set still includes lower left module and lower right module, lower left module and lower right module are located lower in the both sides of module down in the middle of, lower left module, lower in the middle of module and lower right module with the die holder integrated into one piece. The upper die set comprises an upper die seat, wherein the upper die is installed through the upper die seat, the upper die comprises an upper left die block, an upper middle die block group and an upper right die block, and the upper left die block and the upper right die block are positioned on two sides of the upper middle die block group. Specifically, the upper die holder is provided with a left accommodating cavity, a middle accommodating cavity and a right accommodating cavity, and the left upper module, the middle upper module group and the right upper module are respectively correspondingly installed. Further, the left accommodating cavity is provided with a first spring group, two ends of each spring of the first spring group respectively prop against the left upper module and the upper die holder, the right accommodating cavity is provided with a second spring group, and two ends of each spring of the second spring group respectively prop against the right upper module and the upper die holder. The middle-upper module group comprises a middle-upper module, four upper punches and two check blocks, wherein the four upper punches are arranged around the middle-upper module in a surrounding mode, two upper punches are connected with the left upper module on two radial sides o