Double-cavity water expansion mold

Abstract

The utility model discloses a double-cavity water expansion mold. The double-cavity water expansion mold comprises an upper mold block and a lower mold block, a first profiled groove and a second profiled groove are concavely formed in the lower wall of the upper module, a third profiled groove and a fourth profiled groove are concavely formed in the upper wall of the lower module, when the upper module and the lower module are closed, the first profiled groove and the third profiled groove are aligned and buckled to form a first expansion cavity, and the second profiled groove and the fourth profiled groove are aligned and buckled to form a second expansion cavity; a first inlet pipe structure allowing the two first water injection pipes to enter and a second inlet pipe structure allowing the two second water injection pipes to enter are further formed on the upper wall of the lower module and the lower wall of the upper module, and when the upper module and the lower module are closed, the two first water injection pipes are communicated with two ports of the first hollow workpiece to form a closed water path; and the two second water injection pipes are respectively communicated with two ports of the second hollow workpiece to form a closed water path. The expansion device can accurately eliminate recesses and wrinkles of the hollow workpieces, can simultaneously perform expansion treatment on the two hollow workpieces, and is efficient and energy-saving.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and particularly relates to a double-cavity hydroforming mold. Background Art

[0002] The bent stainless steel workpieces are divided into two types: solid and hollow. The bent parts of solid workpieces are not easy to deform, and the product quality is guaranteed, but the production cost is high. The hollow tube workpieces bent from hollow tubes can greatly reduce the production cost. However, during the bending process of the hollow tubes, depressions and wrinkles will appear at the bending parts, seriously affecting the appearance quality of the hollow tube workpieces. Moreover, the traditional bulging mold can only perform the bulging treatment on one hollow workpiece at a time when the mold is closed, with low energy consumption efficiency. Summary of the Invention

[0003] Aiming at the problems of depressions and wrinkles that occur at the bending parts of hollow tube workpieces when using hollow tubes to bend hollow workpieces in the prior art, the utility model provides a double-cavity hydroforming mold to eliminate the depressions and wrinkles, improve the quality of the hollow tube workpieces, and be able to perform the bulging treatment on two hollow workpieces at the same time, with high efficiency and energy saving. The invention purpose of the utility model is realized through the following technical solutions:

[0004] A double-cavity hydroforming mold includes an upper mold assembly and a lower mold assembly. The upper mold assembly includes an upper mold base and an upper mold block fixed below the upper mold base. The lower mold assembly includes a lower mold base and a lower mold block fixed above the lower mold base. A first mold cavity and a second mold cavity are recessed on the lower wall of the upper mold block, and a third mold cavity and a fourth mold cavity are recessed on the upper wall of the lower mold block. When the upper mold block and the lower mold block are closed, the first mold cavity and the third mold cavity are aligned and buckled to form a first bulging cavity for accommodating a first hollow tube workpiece, and the second mold cavity and the fourth mold cavity are aligned and buckled to form a second bulging cavity for accommodating a second hollow tube workpiece. A first inlet pipe structure for two first water injection pipes to enter and a second inlet pipe structure for two second water injection pipes to enter are also formed on the upper wall of the lower mold block and the lower wall of the upper mold block. When the upper mold block and the lower mold block are closed, the two first water injection pipes are respectively communicated with the two ports of the first hollow workpiece to form a closed water circuit, and the two second water injection pipes are respectively communicated with the two ports of the second hollow workpiece to form a closed water circuit.

[0005] Preferably, the upper mold block further includes a first side wall and a second side wall arranged oppositely. The two first open ends of the first mold cavity are both opened towards the first side wall, and the two second open ends of the second mold cavity both extend towards the second side wall.

[0006] Preferably, the upper mold block further includes a third side wall and a fourth side wall arranged oppositely. The two third open ends of the third mold cavity are both opened towards the third side wall, and the two fourth open ends of the fourth mold cavity both extend towards the fourth side wall.

[0007] Preferably, the first inlet pipe structure includes two first inlet pipe grooves recessed in the lower wall of the upper mold and two third inlet pipe grooves recessed in the upper wall of the lower mold. Both of the two first inlet pipe grooves extend to the first side wall and are respectively communicated with the two first open ends. Both of the two third inlet pipe grooves extend to the third side wall and are respectively communicated with the two third open ends. When the upper mold and the lower mold are closed, the two first inlet pipe grooves and the two third inlet pipe grooves are aligned and buckled to form two first inlet pipe holes for the first water injection pipe to enter.

[0008] Preferably, the second inlet pipe structure includes two second inlet pipe grooves recessed in the lower wall of the upper mold and two fourth inlet pipe grooves recessed in the upper wall of the lower mold. Both of the two second inlet pipe grooves extend to the second side wall and are respectively communicated with the two second open ends. Both of the two fourth inlet pipe grooves extend to the fourth side wall and are respectively communicated with the two fourth open ends. When the upper mold and the lower mold are closed, the two second inlet pipe grooves and the two fourth inlet pipe grooves are aligned and buckled to form two second inlet pipe holes for the second water injection pipe to enter.

[0009] Preferably, the lower mold is provided with guide posts, and the upper mold is provided with guide holes adapted to the guide posts.

[0010] Preferably, the first mold cavity, the second mold cavity, the third mold cavity, and the fourth mold cavity are all U-shaped grooves. The first hollow pipe workpiece is a first hollow handle, and the second hollow pipe workpiece is a second hollow handle. The first expansion cavity is adapted to the target contour after the first hollow handle is expanded, and the second expansion cavity is adapted to the target contour after the second hollow handle is expanded.

[0011] Preferably, the first inlet pipe groove, the second inlet pipe groove, the third inlet pipe groove, and the fourth inlet pipe groove are all strip-shaped grooves. The first water injection pipe and the second water injection pipe can both reciprocate horizontally. After the upper mold and the lower mold are closed, the first water injection pipe and the second water injection pipe move towards each other, and the two first water injection pipes are respectively inserted into the two ports of the first hollow handle, and the two second water injection pipes are respectively inserted into the two ports of the second hollow handle. After the upper mold and the lower mold are opened, the first water injection pipe and the second water injection pipe move away from each other, and the two first water injection pipes are separated from the two ports of the first hollow handle, and the two second water injection pipes are separated from the two ports of the second hollow handle.

[0012] Compared with the prior art, the utility model has the following technical effects: the double-cavity hydroforming die structure is reasonably arranged, with die cavities separately provided on the upper module and the lower module. After the upper and lower modules are closed, the aligned die cavities define the hydroforming cavities for two hollow workpieces. Then, by using hydroforming, the hollow workpieces can be formed to the target profile, precisely eliminating the depressions and wrinkles at the bending parts, effectively improving the quality of the hollow workpieces; the two groups of die cavities cooperate with two hydroforming machines to simultaneously perform hydroforming on two hollow workpieces, which is efficient and energy-saving; the die cavities are separately provided on the upper module and the lower module, which can effectively improve the cavity shape stability of the hydroforming cavity, ensure the quality of the hollow workpieces, and facilitate the entry and exit of the hollow workpieces from the die cavities. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the utility model;

[0014] Figure 2 is a schematic structural diagram of the lower die assembly of the utility model;

[0015] Figure 3 is a schematic structural diagram of the lower module of the utility model;

[0016] Figure 4 is a schematic structural diagram of the upper module of the utility model;

[0017] Reference numerals in the drawings: upper die base 10; upper module 20; first die cavity 21; second die cavity 22; first inlet pipe groove 23; second inlet pipe groove 24; lower wall 25; first side wall 26; guide hole 27; lower module 30; third die cavity 31; fourth die cavity 32; third inlet pipe groove 33; fourth inlet pipe groove 34; upper wall 35; third side wall 36; guide post 37; lower die base 40; first hollow handle 51; second hollow handle 52; first water injection pipe 61; second water injection pipe 62. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following further describes the utility model with reference to the embodiments shown in the drawings:

[0019] See Figures 1-4 , the utility model discloses a double-cavity hydroforming die, which is used in cooperation with a hydroforming machine for hydroforming hollow workpieces. Specifically, this embodiment is used to eliminate the depressions and wrinkles at the bending parts of the hollow handle and improve the quality of the hollow handle.

[0020] The double-cavity hydroforming die includes an upper die assembly and a lower die assembly. The upper die assembly includes an upper die base 10 and an upper die block 20 fixedly arranged below the upper die base 10. The lower die assembly includes a lower die base 40 and a lower die block 30 fixedly arranged above the lower die base 40. A first mold cavity 21 and a second mold cavity 22 are recessed in the lower wall 25 of the upper die block 20, and a third mold cavity 31 and a fourth mold cavity 32 are recessed in the upper wall 35 of the lower die block 30. When the upper die block 20 and the lower die block 30 are closed, the first mold cavity 21 and the third mold cavity 31 are aligned and engaged to form a first hydroforming cavity for accommodating a first hollow tube workpiece, and the second mold cavity 22 and the fourth mold cavity 32 are aligned and engaged to form a second hydroforming cavity for accommodating a second hollow tube workpiece. The setting of the two hydroforming cavities can perform hydroforming treatment on two hollow handles simultaneously, which is energy-efficient. Moreover, the hydroforming cavities are jointly defined by the mold cavities separately arranged on the upper die block 20 and the lower die block 30, which can effectively improve the cavity shape stability of the hydroforming cavities, ensure the quality of the hollow handles, reduce the resistance of the hollow handles entering and exiting the mold cavities, facilitate the entry and exit of the hollow handles from the mold cavities, and improve the operation efficiency.

[0021] The upper die block 20 further includes a first side wall 26 and a second side wall which are oppositely arranged. Both first opening ends of the first mold cavity 21 are opened towards the first side wall 26, and both second opening ends of the second mold cavity 22 extend towards the second side wall. The upper die block 20 further includes a third side wall 36 and a fourth side wall which are oppositely arranged. Both third opening ends of the third mold cavity 31 are opened towards the third side wall 36, and both fourth opening ends of the fourth mold cavity 32 extend towards the fourth side wall.

[0022] On the lower wall 25 of the upper module 20 and the upper wall 35 of the lower module 30, there are also formed a first inlet pipe structure for two first water injection pipes 61 to enter and a second inlet pipe structure for two second water injection pipes 62 to enter. When the upper module 20 and the lower module 30 are clamped, the two first water injection pipes 61 are respectively communicated with two ports of the first hollow handle 51 to form a closed water circuit, and the two second water injection pipes 62 are respectively communicated with two ports of the second hollow handle 52 to form a closed water circuit. The first water injection pipe 61 and the second water injection pipe 62 are both communicated with a hydroforming machine, and the depression and wrinkles at the bending part of the hollow handle are eliminated by water pressure. Specifically, the first inlet pipe structure includes two first inlet pipe grooves 23 recessed in the lower wall 25 of the upper module 20 and two third inlet pipe grooves 33 recessed in the upper wall 35 of the lower module 30. Both of the two first inlet pipe grooves 23 extend to the first side wall 26 and are respectively communicated with two first open ends. Both of the two third inlet pipe grooves 33 extend to the third side wall 36 and are respectively communicated with two third open ends. When the upper module 20 and the lower module 30 are clamped, the two first inlet pipe grooves 23 and the two third inlet pipe grooves 33 are aligned and buckled to form two first inlet pipe holes for the first water injection pipe 61 to enter. The second inlet pipe structure includes two second inlet pipe grooves 24 recessed in the lower wall 25 of the upper module 20 and two fourth inlet pipe grooves 34 recessed in the upper wall 35 of the lower module 30. Both of the two second inlet pipe grooves 24 extend to the second side wall and are respectively communicated with two second open ends. Both of the two fourth inlet pipe grooves 34 extend to the fourth side wall and are respectively communicated with two fourth open ends. When the upper module 20 and the lower module 30 are clamped, the two second inlet pipe grooves 24 and the two fourth inlet pipe grooves 34 are aligned and buckled to form two second inlet pipe holes for the second water injection pipe 62 to enter.

[0023] The first mold groove 21, the second mold groove 22, the third mold groove 31, and the fourth mold groove 32 are all U-shaped grooves. The first hydroforming cavity is adapted to the target contour after the first hollow handle 51 is hydroformed, and the second hydroforming cavity is adapted to the target contour after the second hollow handle 52 is hydroformed. In practical applications, the structure of the mold groove is set according to the contour of the hollow workpiece. The first inlet pipe groove 23, the second inlet pipe groove 24, the third inlet pipe groove 33, and the fourth inlet pipe groove 34 are all strip-shaped grooves. The first water injection pipe 61 and the second water injection pipe 62 can both reciprocate horizontally under the drive of the workbench. In order to ensure the accuracy of clamping the upper module 20 and the lower module 30 and ensure the stability of the cavity shape of the hydroforming cavity, a guiding structure is provided between the upper module 20 and the lower module 30, specifically, a guiding column 37 fixed on the lower module 30 and a guiding hole 27 opened on the upper module 20.

[0024] During operation, the hollow handle after bending and forming is placed into the lower module 30, and then the upper module 20 moves downward to close the mold. The worktables on both the left and right sides move towards each other simultaneously, driving the two groups of water injection pipes to move towards each other. After the upper module 20 and the lower module 30 are closed, the first water injection pipe 61 and the second water injection pipe 62 move towards each other, and the two first water injection pipes 61 are respectively inserted into the two ports of the first hollow handle 51 for water injection and swelling, and the two second water injection pipes 62 are respectively inserted into the two ports of the second hollow handle 52 for water injection and swelling; after the first hollow handle 51 and the second hollow handle 52 are swollen to the target profile, driven by the worktable, the first water injection pipe 61 and the second water injection pipe 62 move away from each other, and the two first water injection pipes 61 are separated from the two ports of the first hollow handle 51, and the two second water injection pipes 62 are separated from the two ports of the second hollow handle 52. After the upper module 20 and the lower module 30 are opened, the two swollen hollow handles can be taken out, and the operation is simple and efficient.

[0025] It should be understood that in the claims and the specification of the present invention, all "including..." should be understood in an open sense, that is, its meaning is equivalent to "at least including...", rather than in a closed sense, that is, its meaning should not be understood as "only including...". The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0026] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Changes, modifications, additions or substitutions made by those skilled in the art within the essence of the present invention should all be covered within the protection scope of the present invention.

Claims

1. A double-cavity water swelling mold, comprising an upper mold assembly and a lower mold assembly, wherein the upper mold assembly comprises an upper mold base and an upper mold block fixedly arranged below the upper mold base, and the lower mold assembly comprises a lower mold base and a lower mold block fixedly arranged above the lower mold base, characterized in that: The lower wall of the upper module is recessed with a first groove and a second groove, and the upper wall of the lower module is recessed with a third groove and a fourth groove. When the upper module and the lower module are molded together, the first groove and the third groove are aligned and snapped together to form a first expansion cavity for accommodating the first hollow tube workpiece, and the second groove and the fourth groove are aligned and snapped together to form a second expansion cavity for accommodating the second hollow tube workpiece; the upper wall of the lower module and the lower wall of the upper module are also formed with a first inlet pipe structure for two first water injection pipes to enter, and a second inlet pipe structure for two second water injection pipes to enter. When the upper module and the lower module are molded together, the two first water injection pipes are respectively connected to the two ports of the first hollow workpiece to form a closed water circuit, and the two second water injection pipes are respectively connected to the two ports of the second hollow workpiece to form a closed water circuit.

2. A double-cavity water swelling mold according to claim 1, characterized in that: The upper module further includes a first side wall and a second side wall which are arranged opposite to each other. Both first opening ends of the first groove are opened toward the first side wall, and both second opening ends of the second groove are extended toward the second side wall.

3. A double-cavity water swelling mold according to claim 2, characterized in that: The upper module further includes a third side wall and a fourth side wall which are arranged opposite to each other. Both third opening ends of the third groove are opened toward the third side wall, and both fourth opening ends of the fourth groove are extended toward the fourth side wall.

4. A double-cavity water swelling mold according to claim 3, characterized in that: The first pipe inlet structure includes two first pipe inlet grooves recessed in the lower wall of the upper module, and two third pipe inlet grooves recessed in the upper wall of the lower module. The two first pipe inlet grooves extend to the first side wall and are respectively connected to the two first opening ends. The two third pipe inlet grooves extend to the third side wall and are respectively connected to the two third opening ends. When the upper module and the lower module are molded together, the two first pipe inlet grooves and the two third pipe inlet grooves are aligned and snapped together to form two first pipe inlet holes for the first water injection pipe to enter.

5. A double-cavity water swelling mold according to claim 4, characterized in that: The second pipe inlet structure includes two second pipe inlet grooves recessed in the lower wall of the upper module, and two fourth pipe inlet grooves recessed in the upper wall of the lower module. The two second pipe inlet grooves extend to the second side wall and are respectively connected to the two second opening ends. The two fourth pipe inlet grooves extend to the fourth side wall and are respectively connected to the two fourth opening ends. When the upper module and the lower module are molded together, the two second pipe inlet grooves and the two fourth pipe inlet grooves are aligned and snap-fitted to form two second pipe inlet holes for the second water injection pipe to enter.

6. A double-cavity water swelling mold according to claim 5, characterized in that: The lower module is provided with a guide column, and the upper module is provided with a guide hole matched with the guide column.

7. A double-cavity water swelling mold according to claim 6, characterized in that: The first type groove, the second type groove, the third type groove, and the fourth type groove are all U-shaped grooves, the first hollow tube workpiece is a first hollow handle, the second hollow tube workpiece is a second hollow handle, the first expansion cavity is adapted to the target contour of the first hollow handle after expansion, and the second expansion cavity is adapted to the target contour of the second hollow handle after expansion.

8. A double-cavity water swelling mold according to claim 7, characterized in that: The first pipe inlet groove, the second pipe inlet groove, the third pipe inlet groove, and the fourth pipe inlet groove are all strip grooves, and the first water injection pipe and the second water injection pipe can both reciprocate horizontally. After the upper module and the lower module are molded, the first water injection pipe and the second water injection pipe move toward each other, and the two first water injection pipes are respectively inserted into the two ports of the first hollow handle, and the two second water injection pipes are respectively inserted into the two ports of the second hollow handle; after the upper module and the lower module are opened, the first water injection pipe and the second water injection pipe move away from each other, and the two first water injection pipes are detached from the two ports of the first hollow handle, and the two second water injection pipes are detached from the two ports of the second hollow handle.

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