High-rib differential-temperature spinning die for ribbed cylindrical part and forming method

Abstract

The invention relates to the field of material forming, and discloses a ribbed cylindrical part high-rib differential temperature spinning die which comprises a split core die and a base, the split core die is fixedly installed in a fastening ring on the surface of the base through a flange at the bottom, and a mortise is formed in the area, corresponding to a rib groove, of the split core die and used for installing a rib groove sub-die. The rib groove sub-mold is made of a high-resistivity material and is fixedly connected with the split core mold through a tenon at the bottom, and the split core mold is fixedly connected with the end cover through a bolt. The invention further discloses an induction heating spinning forming method, induction heating and spinning forming can be carried out synchronously, and the forming efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material forming, in particular to a high-stiffener temperature difference spinning die for a stiffened cylindrical part and a forming method. BACKGROUND

[0002] The spinning process of the stiffened cylindrical part has wide application potential in high-end manufacturing fields (such as aerospace and weapons) and civil industries due to its high efficiency, energy saving and high precision. In the field of aerospace, the stiffened cylindrical part is often used as a key component such as an aircraft engine cabin section and a rocket body load-bearing structure, and the lightweight and high-strength requirements of the structure are of great significance to improving the thrust-to-weight ratio, range and flight performance of the aircraft. In the field of weapons, such components are used in artillery shells and armored vehicle transmission system housings, which need to withstand impact, pressure and other loads under complex working conditions. The high precision and good mechanical properties of spinning forming can ensure the reliability and combat effectiveness of equipment.

[0003] For the spinning forming of difficult-to-deform materials and stiffened complex structure cylindrical parts, the Chinese invention patent with the application publication number CN104249116A discloses an endogenous heat spinning die and a forming method. The method generates heat inside the die through electromagnetic induction heating rods in the middle of the core die, and then uses heat transfer to heat the spinning core die and the inner wall of the tube blank. At the same time, a temperature rising gun is used to heat the outer wall of the spinning tube blank to effectively enhance the flow of metal materials. However, when facing the spinning forming of low resistivity aluminum alloy, copper alloy and other stiffened cylindrical parts with wide application, the temperature rise caused by electromagnetic induction heating is limited by factors such as induction heating equipment, which seriously restricts the forming of low resistivity material stiffened cylindrical parts. In order to improve the forming height of the stiffened cylindrical part and the yield of the finished product, promote the flow of materials in the rib groove area, and reduce the influence of the axial elongation of the tube blank in the forming process caused by heating, the present application proposes a high-stiffener temperature difference spinning die for a stiffened cylindrical part and a forming method. Under the action of the induction coil, the rib groove sub-die is rapidly heated, and heat transfer is used to heat the local area of the tube blank. SUMMARY

[0004] The purpose of the present application is to provide a high-stiffener temperature difference spinning die for a stiffened cylindrical part and a forming method to solve the problems raised in the background.

[0005] To achieve the above purpose, the present application provides the following technical solution: a high-stiffener temperature difference spinning die for a stiffened cylindrical part, comprising a split core die and a base, the split core die being composed of a passive core die and an active core die spaced from each other; wherein the cross-sectional shape of the active core die is an isosceles trapezoidal structure; the cross-sectional shape of the passive core die is a sector shape.

[0006] The split core mold is fixedly installed in the fastening ring on the surface of the base through the flange at the bottom, and the active core mold is provided with a mortise and tenon I corresponding to the rib groove area for installing the rib groove sub-mold I, and the passive core mold is provided with a mortise and tenon II corresponding to the rib groove area for installing the rib groove sub-mold II;

[0007] The rib groove sub-mold I is fixedly connected to the active core mold through the tenon I at the bottom; the rib groove sub-mold II is fixedly connected to the passive core mold through the tenon II at the bottom;

[0008] Axial positioning threaded holes are provided on both the passive core mold and the active core mold.

[0009] Preferably: the rib groove sub-mold I and the rib groove sub-mold II are both made of high resistivity materials;

[0010] Preferably, the number of the passive core dies and the number of the active core dies are both three.

[0011] Preferably, the rib-groove sub-mold I is installed on the active core mold through the tenon groove I, and the rib-groove sub-mold II is installed on the passive core mold through the tenon groove II.

[0012] Preferably, an end cover is mounted on the upper portion of the petal core mold.

[0013] Preferably, the end cover fixes the petal core mold and the base by fastening bolts adapted to the axial positioning threaded holes.

[0014] Preferably, the surface of the base is provided with a plurality of mounting holes for assembling with a spinning machine.

[0015] Preferably, the fastening ring is provided with a plurality of positioning holes for assembly with the base.

[0016] According to the above-mentioned high-rib differential temperature spinning die forming method for a ribbed cylindrical part, the following steps are included: Step 1, assembling the spinning die and the cylinder blank, the base is fixedly installed with the spinning machine through the mounting hole, and the fastening ring is fixedly connected with the base through the positioning hole; the petal core mold is connected with the fastening ring through the flange at the bottom thereof, the rib groove sub-mold I is installed in the tenon groove I of the active core mold, the rib groove sub-mold II is installed in the tenon groove II of the passive core mold, the end cover is used to fasten the petal core mold to the base through the fastening bolts, and the spinning cylindrical part is mounted on the petal core mold; Step 2, spinning Shape, the rotating wheel is screwed in from the side close to the upper part of the end cover. Before spinning, place the induction coil in the initial spinning area and turn on the power, adjust the induction coil current and heating time, and use a temperature gun to measure the temperature of the tube blank in the rib groove area for regulation. After reaching the required temperature, start spinning, and keep the temperature change of the spinning area within the range of ±10℃ during the spinning process. At the same time, make the induction coil and the rotating wheel move synchronously in the axial direction of the tube blank; Step 3, take out the part. After spinning is completed, remove the induction coil, remove the fastening ring and the fastening bolts on the end cover, and then demold.

[0017] Compared with the prior art, the present application has the beneficial effects that:

[0018] The present application solves the problems of the traditional heating mode, such as the rapid heat dissipation of the aluminum alloy cylinder during the whole heating and forming of the heating furnace, or the low efficiency and difficult temperature control of the local heating of the flame gun.

[0019] The present application realizes the differential temperature heating of the material in the rib groove area of the spinning cylinder blank, increases the temperature difference between the material in the rib groove area and the non-rib groove area, promotes the radial filling of the material into the rib groove, reduces the axial elongation of the cylinder blank, and improves the forming height of the inner rib of the cylindrical part.

[0020] The present application has reasonable design, effectively promotes the flow of the material in the local area during the spinning forming process of the ribbed cylindrical part and the difficult deformation material, especially during the spinning forming of the ribbed cylindrical part, effectively promotes the filling of the material in the rib groove area, and at the same time reduces the axial elongation of the cylinder blank during the forming process caused by heating. It has high practicability and popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The figure shows the schematic diagram of the mold structure of the present application;

[0022] Figure 2 The figure shows the schematic diagram of the mold explosion of the present application;

[0023] Figure 3 The figure shows the structure plan view of the mold of the present application;

[0024] Figure 4 The figure shows the assembly drawing of the mold and the cylinder blank of the present application;

[0025] Figure 5 The figure is the structure diagram of the passive core mold in embodiment 1 of the present application;

[0026] Figure 6 The figure is the structure diagram of the active core mold in embodiment 1 of the present application.

[0027] In the figure: 1, split core mold, 1-1, active core mold, 1-2, passive core mold, 2, base, 3, fastening ring, 4-1, mortise I, 4-2, mortise II, 5-1, rib groove sub-mold I, 5-2, rib groove sub-mold II, 6, axial positioning threaded hole, 7, end cover, 8, fastening bolt, 9, mounting hole, 10, positioning hole, 11, cylinder blank, 12, cylinder blank stop pin, 1-13, tenon I, 2-13, tenon II, 14, induction coil; 15, positioning bolt, 16, spinning wheel, 17, main shaft positioning threaded hole. DETAILED DESCRIPTION

[0028] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0029] Embodiment 1

[0030] Please refer to Figures 1-6 , a high rib differential temperature spinning die for a ribbed cylindrical part in the drawing, comprising a split core die 1 and a base 2, characterized in that:

[0031] The split core die 1 is composed of a passive core die 1-2 and an active core die 1-1 spaced from each other; wherein the cross-sectional shape of the active core die 1-1 is isosceles trapezoidal structure; the cross-sectional shape of the passive core die 1-2 is fan-shaped;

[0032] The split core die 1 is fixedly installed in the fastening ring 3 on the surface of the base 2 through the flange at the bottom, and the active core die 1-1 is provided with a mortise groove I 4-1 corresponding to the rib groove area for installing a rib groove sub-mold I 5-1, and the passive core die 1-2 is provided with a mortise groove II 4-2 corresponding to the rib groove area for installing a rib groove sub-mold II 5-2;

[0033] The rib groove sub-mold I 5-1 is fixedly connected with the active core die 1-1 through the tenon head I 1-13 at the bottom; and the rib groove sub-mold II 5-2 is fixedly connected with the passive core die 1-2 through the tenon head II 2-13 at the bottom;

[0034] Axial positioning threaded holes 6 are formed on the passive core die 1-2 and the active core die 1-1.

[0035] In the embodiment, the rib groove sub-mold I 5-1 and the rib groove sub-mold II 5-2 are both made of high resistivity material; the number of the passive core die 1-2 and the active core die 1-1 is both three; the rib groove sub-mold I (5-1) is installed on the active core die (1-1) through the mortise groove I (4-1), the rib groove sub-mold II (5-2) is installed on the passive core die (1-2) through the mortise groove II (4-2), an end cover 7 is sleeved on the upper part of the split core die, and the end cover 7 fixes and installs the split core die 1 and the base 2 through the fastening bolts 8 matched with the axial positioning threaded holes 6.

[0036] Further, a plurality of mounting holes 9 for assembling with the spinning machine are formed on the surface of the base 2, and a plurality of positioning holes 10 for assembling with the base are formed on the fastening ring 3.

[0037] In this embodiment, a high rib differential temperature spinning die forming method for a ribbed cylindrical part includes the following steps: Step 1, assembling the spinning die and the cylindrical blank, the base is fixedly installed with the spinning machine through the mounting hole, and the fastening ring is fixedly connected with the base through the positioning hole; the split core mold is connected with the fastening ring through the flange at the lower part thereof, the rib groove sub-mold I 5-1 is installed in the tenon groove I 4-1 of the driving core mold 1-1, the rib groove sub-mold II 5-2 is installed in the tenon groove II 4-2 of the passive core mold 1-2, the end cover is installed on the base by means of fastening bolts, and the spinning cylindrical part is sleeved on the split core mold; Step 2, spinning forming, the spinning wheel 16 is spun in from the side close to the upper part of the end cover, the induction coil is placed in the initial spinning area before spinning and is connected to the power supply, the current of the induction coil and the heating time are adjusted, the temperature of the rib groove area of the cylindrical blank is measured by using the temperature measuring device for adjustment and control, the spinning is started after the required temperature (for example, 100℃, 200℃ or 300℃, etc.) is reached, the temperature change of the spinning area is controlled within ±10℃ during the spinning process, and the induction coil and the spinning wheel 16 are synchronously moved in the axial direction of the cylindrical blank; Step 3, taking out the part, after the spinning is completed, the induction coil is taken out, the fastening ring and the fastening bolts on the end cover are removed, and then the mold is demolded.

[0038] Further, as shown in Figure 3 the base 2 main shaft upper part and the end cover 7 are both provided with main shaft positioning thread holes 17, and the cylindrical blank is installed on the spinning core mold through the thread holes on the cylindrical blank stop pin 12, while preventing the axial movement and rotation of the cylindrical blank during spinning.

[0039] In specific implementation, the split core mold of the spinning die can be made of hot work die steel H13 steel, and the rib groove sub-mold I 5-1 and the rib groove sub-mold II 5-2 can be high-temperature alloy materials with high resistivity, but are not limited thereto.

[0040] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0041] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A high-rib differential temperature spinning die for a ribbed cylindrical part, comprising a split core die (1) and a base (2), characterized in that: The split core mold (1) is composed of a passive core mold (1-2) and an active core mold (1-1) spaced apart from each other; wherein the cross-sectional shape of the active core mold (1-1) is an isosceles trapezoidal structure; and the cross-sectional shape of the passive core mold (1-2) is a fan-shaped structure. The split core mold (1) is fixedly installed in a fastening ring (3) on the surface of the base (2) through a flange at the bottom, and the active core mold (1-1) is provided with a tongue and groove I (4-1) corresponding to the rib groove area for installing the rib groove sub-mold I (5-1), and the passive core mold (1-2) is provided with a tongue and groove II (4-2) corresponding to the rib groove area for installing the rib groove sub-mold II (5-2); The rib groove sub-mold I (5-1) is fixedly connected to the active core mold (1-1) via the tenon I (1-13) at the bottom; the rib groove sub-mold II (5-2) is fixedly connected to the passive core mold (1-2) via the tenon II (2-13) at the bottom; Axial positioning threaded holes (6) are provided on both the passive core mold (1-2) and the active core mold (1-1).

2. The high-rib differential temperature spinning die for ribbed cylindrical parts according to claim 1, characterized in that: The rib-groove sub-mold I (5-1) and the rib-groove sub-mold II (5-2) are both made of high-resistivity materials; the number of the passive core mold (1-2) and the active core mold (1-1) are both three; the rib-groove sub-mold I (5-1) is installed on the active core mold (1-1) through the tenon groove I (4-1), and the rib-groove sub-mold II (5-2) is installed on the passive core mold (1-2) through the tenon groove II (4-2).

3. The high-rib differential temperature spinning die for ribbed cylindrical parts according to claim 2, characterized in that: An end cover (7) is sleeved on the upper part of the petal core mold.

4. The high-rib differential temperature spinning die for ribbed cylindrical parts according to claim 3, characterized in that: The end cover (7) is used to fix the petal core mold (1) and the base (2) via a fastening bolt (8) adapted to the axial positioning threaded hole (6).

5. The high-rib differential temperature spinning die for ribbed cylindrical parts according to claim 4, characterized in that: The surface of the base (2) is provided with a plurality of mounting holes (9) for assembly with a spinning machine.

6. The high-rib differential temperature spinning die for ribbed cylindrical parts according to claim 5, characterized in that: The fastening ring (3) is provided with a plurality of positioning holes (10) for assembly with the base.

7. A forming method for high-ribbed cylindrical parts with ribs by differential temperature spinning according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: step 1, assembling the spinning mold and the cylindrical blank, the base (2) is fixedly mounted on the spinning machine through the mounting hole (9), and the fastening ring (3) is fixedly connected to the base (2) through the positioning hole (10); the petal core mold (1) is connected to the fastening ring (3) through the flange at the lower part thereof, the rib groove sub-mold I (5-1) is mounted in the tenon groove I (4-1) of the active core mold (1-1), and the rib groove sub-mold II (5-2) is mounted in the tenon groove II (4-2) of the passive core mold (1-2); the end cover (7) mounts the petal core mold (1) on the base (2) through the fastening bolts (8), and the spinning cylindrical part is mounted on the petal core mold (1); Step 2, spinning, the spinning wheel (16) is screwed in from the side close to the upper part of the end cover (7), the induction coil (14) is placed in the initial spinning area and the power is turned on before spinning, the current and heating time of the induction coil (14) are adjusted, and the temperature of the tube blank in the rib groove area is measured with a temperature measuring gun, and spinning is started after reaching the required temperature, and the temperature change of the spinning area is kept within the range of ±10°C during the spinning process, while the induction coil and the spinning wheel (16) are moved synchronously in the axial direction of the tube blank; Step 3, taking out the piece, after the spinning is completed, remove the induction coil (14), remove the fastening ring (3) and the fastening bolts (8) on the end cover (7), and then demold.

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