CN115673117A - Local variable-temperature forming device and method for linkage die of titanium alloy hoop-belt type component - Google Patents

Abstract

The invention discloses a local variable-temperature forming device and method for a titanium alloy strap type component linkage mold, wherein a limiting block and a lower mold are fixedly connected with an upper platform and a lower platform of a hydraulic press through a T-shaped groove and a clamping mechanism respectively, the moving direction of the limiting block is ensured, an adjusting block is connected with an insulating base plate through a bolt, the adjusting block is connected with the insulating base plate and the limiting block through a supporting and positioning spring, and the local variable-temperature forming device and method for the titanium alloy strap type component linkage mold solve the problems of large rebound quantity and low forming precision of a titanium alloy large-angle thin-wall bending component; the differential temperature rapid heating of the titanium alloy forming plate blank is realized, the temperature of the forming part is high, the temperature of the non-forming part is low, and the adverse effect of the temperature on the non-forming part is reduced on the premise of ensuring the deformation temperature; the titanium alloy belt structure component is formed in one process.

Description

Local variable-temperature forming device and method for linkage die of titanium alloy hoop-belt type component

Technical Field

The invention relates to the technical field of structural design and application of precision plastic forming of titanium alloy thin-wall components, and particularly provides a local temperature-changing forming device and method for a linkage mold of a titanium alloy strap component.

Background

The titanium alloy thin-wall strap is an important functional component of an aeroengine and plays a role in connecting an additional structure with an engine main body. The part shape comprises a straight section in the middle area and annular sections at two sides. However, the titanium alloy material has low elastic modulus and plastic deformation capability and high yield strength, so that the thin-wall member has large room-temperature deformation resilience, high deformation resistance and low forming precision, and particularly, the titanium alloy thin-wall bending member is difficult to realize precise forming at room temperature. The existing forming method generally reduces the deformation resistance of the titanium alloy, eliminates residual stress, improves the deformation capability and improves the forming quality by increasing the forming temperature of the titanium alloy. Therefore, for titanium alloy thin-walled band members, precision manufacturing is currently generally achieved by a two-step press-and-bend forming process based on a hot forming technique.

However, the conventional hot forming method using a heating furnace needs to heat a mold and a formed part at the same time, which results in long manufacturing period of the part and low forming efficiency, and the forming mold works in a high temperature environment for a long time, which results in a reduction in service life, and heating of a large-sized mold also results in an increase in energy consumption and an increase in production cost. Meanwhile, the application of a complex multidirectional movement forming mechanism is difficult to realize due to the limitation of the size of a heating furnace and the thermal state environment, so that the annular sections on the two sides of the titanium alloy thin-wall strap component can only adopt a step-by-step twice thermal bending forming process, the processing process is increased, and two sets of bending dies need to be designed independently. In addition, prolonged exposure of titanium alloys to high temperature environments can also lead to coarsening of the microstructure of the material and a reduction in mechanical properties.

People hope to obtain a titanium alloy strap component linkage mold local variable temperature forming device and method with excellent technical effect.

Disclosure of Invention

The invention aims to provide a local variable-temperature forming device and method for a titanium alloy strap component linkage mold, which have excellent technical effects. Aiming at the defects that the traditional thermoforming procedures of the titanium alloy band component of the aircraft engine are multiple, the efficiency is low, the service life of a die is short, the organization of the component is greatly influenced by heat and the size of a formed part is limited by the size of a heating furnace, the device and the method for forming the titanium alloy band component in a local temperature-varying mode through linkage with the die are provided, and therefore the precise forming of the titanium alloy band component with high efficiency, high quality and low energy consumption is achieved.

The local variable-temperature forming device and the method for the linkage die of the titanium alloy band type component aim at the defects of the existing titanium alloy thin-wall band type component forming technology, and the rapid heating of the bent part of the formed plate blank is realized by the joule heating effect generated by pulse current through metal; the transverse linkage die is adopted to realize that the annular bending part completes forming in one forming cycle, so that the forming process is shortened; the forming device is designed to be variable in thickness, and the heat generated in the forming process is reduced by reducing the current density of the middle section, so that the adverse effects of high temperature on the microstructure and the mechanical property of the titanium alloy are weakened. The method comprehensively utilizes the rapid heating advantage of current energy field assisted thermoforming, realizes temperature regulation and control by controlling local current density, and realizes optimized design of a multidirectional linkage die tooling structure and accurate control of a forming loading sequence, so that the method has creativity and novelty in the accurate forming field of high efficiency, high quality and low energy consumption of titanium alloy thin-wall strap members.

The local variable-temperature forming device of the linkage mould of the titanium alloy hoop components comprises: the device comprises a hydraulic machine, a limiting block, an electrode, a power supply, an insulating base plate, a regulating block, an upper die insulating and heat insulating layer, a core die, a lower die insulating and heat insulating layer, a temperature thermocouple, a lower die, a supporting and positioning spring and an ultrathin insulating cushion layer; the limiting block and the lower die are fixedly connected with an upper platform and a lower platform of the hydraulic machine through a T-shaped groove and a clamping mechanism respectively, and the movement direction of the limiting block is ensured; the adjusting block is connected with the insulating base plate through a bolt, the adjusting block is connected with the insulating base plate and the limiting block through a supporting and positioning spring, and vertical pressure can be provided while the adjusting block plays a positioning role; the upper die insulation heat insulation layer is connected to the outer side of the upper die, the lower die insulation heat insulation layer is connected to the outer side of the lower die, the electrode is connected with the forming plate blank through bolts or a mechanical clamping mechanism, and the positive pole and the negative pole of the electrode are respectively connected with the two sides of the forming plate blank and form a loop with a power supply; the surface of the core mould is provided with an insulating layer which can be a ceramic sheet or an asbestos gasket which is used for insulating the surface of the core mould or has the same shape with the surface of the core mould; . The temperature thermocouple is placed in a temperature measuring hole of the lower die, the ultrathin insulating cushion layer is placed on the formed slab, the ultrathin thickness is smaller than 0.2mm, the slab is prevented from being folded to contact with the ultrathin insulating cushion layer, and a part of the formed slab is prevented from being short-circuited.

Preferably, the upper die only moves along the horizontal direction and can rotate around the tail part of the upper die, so that the upper die is prevented from colliding with structures such as a core die in a forming process in an interference mode.

The upper die insulating layer and the lower die insulating layer are made of alumina, zirconia, ceramic sheets, asbestos gaskets and the like.

The local variable-temperature forming method of the linkage mold of the titanium alloy hoop component comprises the following specific steps of:

the method comprises the following steps: cutting the formed plate blank according to the shape and size characteristics of the band component;

step two: respectively carrying out insulating and heat-insulating coating treatment on the contact parts of the upper die, the lower die and the core die and the formed plate blank, wherein the thickness of the coating is 5-800 mu m;

step three: the hydraulic press is sequentially provided with a limiting block, a supporting and positioning spring, an insulating base plate, an adjusting block, upper dies, a core die and a lower die, wherein the limiting block is arranged on an upper platform of the hydraulic press;

step four: two ends of a formed slab are respectively and tightly connected with two electrodes, one side electrode is connected with a positive electrode of a power supply, the other side electrode is connected with a negative electrode of the power supply, the formed slab is placed on a lower die according to the position, and the current value range of the power supply is 0A to 20000A;

step five: starting a hydraulic press, moving a limiting block downwards to enable an adjusting block to be in contact with a formed slab, and applying vertical pressure to the formed slab through a supporting and positioning spring;

step six: the core mold moves downwards to be matched with the lower mold, the formed slab is bent, two sides of the formed slab can be vertically lifted, and then an ultrathin insulating cushion layer is placed at the bent and superposed part of the formed slab;

step seven: a power supply is switched on, so that the temperature of the bent part of the formed plate blank is raised to 600-900 ℃;

step eight: the upper die moves towards the center to enable the formed plate blank to bend inwards, and the upper die moves to the position of a die assembly position;

step nine: the limiting block moves downwards, and the formed plate blank is subjected to plastic deformation through vertical pressure applied to the upper die until the upper die and the lower die are matched;

step ten: after the power is electrified and the temperature is kept for 1min to 10min, controlling a power supply to gradually reduce the current until the current returns to zero, and turning off the power supply;

step eleven: and (3) moving the upper platform of the hydraulic machine upwards, withdrawing the upper die along the horizontal direction, laterally withdrawing the forming core die and the ultrathin insulating cushion layer, separating the electrode from the formed slab, and taking out the formed part.

The local variable-temperature forming device and the method for the linkage die of the titanium alloy hoop-belt type component solve the problems of large rebound quantity and low forming precision of the titanium alloy large-angle thin-wall bending component; the differential temperature rapid heating of the titanium alloy forming plate blank is realized, the temperature of the forming part is high, the temperature of the non-forming part is low, and the adverse effect of the temperature on the non-forming part is reduced on the premise of ensuring the deformation temperature; the titanium alloy strap structure component is formed in one process.

Drawings

The invention is described in further detail below with reference to the following figures and embodiments:

FIG. 1 is a schematic view of a titanium alloy hoop member linked with a mold local temperature-changing forming device and a formed slab during a forming process;

fig. 2 is a schematic diagram of the position of the titanium alloy band component in the final forming state in conjunction with the local temperature-changing forming device of the die and the formed plate blank.

In the figure: 1. the device comprises a limiting block, 2, electrodes, 3, a power supply, 4, an insulating base plate, 5, a regulating block, 6, a forming plate blank, 7, an upper die, 8, an upper die insulating layer, 9, a core die, 10, a lower die insulating layer, 11, a temperature thermocouple, 12, a lower die, 13, a supporting and positioning spring, 14 and an ultrathin insulating cushion layer.

Detailed Description

The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and should not be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.

Example 1

The local variable-temperature forming device of the linkage mould of the titanium alloy hoop components comprises: the device comprises a hydraulic machine, a limiting block 1, an electrode 2, a power supply 3, an insulating base plate 4, a regulating block 5, an upper die 7, an upper die insulating and heat insulating layer 8, a core die 9, a lower die insulating and heat insulating layer 10, a temperature thermocouple 11, a lower die 12, a supporting and positioning spring 13 and an ultrathin insulating cushion layer 14; the limiting block 1 and the lower die 12 are fixedly connected with an upper platform and a lower platform of the hydraulic machine through a T-shaped groove and a clamping mechanism respectively, and the movement direction of the limiting block 1 is ensured; the adjusting block 5 is connected with the insulating base plate 4 through a bolt, the adjusting block 5, the insulating base plate 4 and the limiting block 1 are connected through a supporting and positioning spring 13, and vertical pressure can be provided while the positioning effect is achieved; the upper die insulation and heat insulation layer 8 is connected to the outer side of the upper die 7, the lower die insulation and heat insulation layer 10 is connected to the outer side of the lower die 12, the electrode 2 and the forming plate blank 6 are in bolt connection or are connected through a mechanical clamping mechanism, and the positive pole and the negative pole of the electrode 2 are respectively connected with the two sides of the forming plate blank 6 and form a loop with the power supply 3; the surface of the core mold 9 is provided with an insulating layer which can be a ceramic sheet or an asbestos gasket which is subjected to insulating treatment on the surface of the core mold or has the same shape with the surface of the core mold 9; the temperature thermocouple 11 is placed in a temperature measuring hole of the lower die 12, the ultrathin insulating cushion layer 14 is placed on the formed slab 6, the ultrathin thickness is smaller than 0.2mm, the slab is prevented from being folded to contact with the slab, and a part of the formed slab is prevented from being short-circuited.

Preferably, the upper die 7 only moves along the horizontal direction and can rotate around the tail part of the upper die, so that the interference and collision with structures such as a core die are avoided in the forming process.

The upper die insulating layer 8 and the lower die insulating layer 10 are made of alumina, zirconia, ceramic sheets, asbestos gaskets and the like.

The local variable-temperature forming method of the linkage mold of the titanium alloy hoop component comprises the following specific steps of:

the method comprises the following steps: according to the shape and size characteristics of the belt component, cutting the formed plate blank 6 into the shape and size to be processed by adopting methods such as laser cutting, linear cutting or water cutting, polishing the edge of the formed plate blank 6, and removing defects such as burrs and flashes;

step two: the contact parts of the upper die 7, the lower die 12, the core die 9 and the formed plate blank 6 are respectively subjected to insulation and heat insulation coating treatment, the insulation and heat insulation coatings are uniformly distributed by regulating and controlling treatment parameters, the thicknesses of all the parts are close, and the coating thickness is 5-800 mu m;

step three: respectively installing a limiting block 1 and a lower die 12 on an upper platform and a lower platform of a hydraulic machine, and then fixedly installing a supporting and positioning spring 13, an insulating base plate 4 and an adjusting block 5 under the limiting block 1 in sequence, wherein the insulating base plate 4 and the adjusting block 5 are connected by bolts or machinery, the supporting and positioning spring 13 plays a role in positioning and controlling the positions of the insulating base plate 4 and the adjusting block 5, an upper die 7 is respectively fixed on side cylinders of the hydraulic machine at two ends so as to enable the upper die to move along the horizontal direction, and a core die 9 is fixed on the other upper platform of the hydraulic machine through a connecting rod so as to enable the upper die to move along the vertical direction;

step four: two ends of a formed plate blank 6 are respectively and tightly connected with two electrodes 2, one side electrode 2 is connected with the positive pole of a power supply 3, the other side electrode 2 is connected with the negative pole of the power supply 3, so that a current loop is formed, the power supply 3 is kept closed during installation, two sides of the formed plate blank 6 are sprayed with a lubricant, and then the formed plate blank 6 is placed on a lower die according to the position.

Step five: starting the hydraulic machine, moving the limiting block 1 downwards to enable the adjusting block 5 to be in contact with the formed slab 6, and applying vertical pressure to the formed slab 6 through the supporting and positioning spring 13 to avoid the phenomenon of sparking caused by current passing;

step six: the core mold moves downwards to be matched with the lower mold, so that the formed slab 6 is subjected to plastic deformation and bending, two sides of the formed slab 6 can be vertically lifted along the molded surface of the mold, and then an ultrathin insulating cushion layer is placed at the bending superposition part of the formed slab 6;

step seven: turning on a power supply, and gradually increasing the current to quickly raise the temperature of the plastic deformation bending part of the formed plate blank 6 to 600-900 ℃;

step eight: the upper die 7 moves towards the center to bend the formed slab inwards, and the upper die 7 moves to the position of a die assembly position; the final die pasting of the bending part of the formed plate blank can be ensured;

step nine: the limiting block 1 moves downwards, the upper die 7 deflects downwards by applying vertical pressure on the upper die 7, and then the formed plate blank 6 is subjected to plastic deformation until the upper die 7 and the lower die 12 are matched, and the forming process is completed;

step ten: after the power is electrified and the temperature is kept for 1min to 10min, controlling the power supply current to gradually decrease until the numerical value is zero, and turning off the power supply;

step eleven: the upper platform of the hydraulic machine moves upwards, the side cylinder retracts, the upper die 7 retracts along the horizontal direction, the forming core die 9 and the ultrathin insulating cushion layer 14 are drawn out along the lateral direction, the electrode 2 is separated from the formed slab 6, and the formed part is taken out.

Example 2

The local variable-temperature forming method of the linkage mold of the titanium alloy hoop component comprises the following specific steps:

the method comprises the following steps: according to the shape and size characteristics of the belt component, cutting the formed plate blank 6 into the shape and size to be processed by adopting methods such as laser cutting, linear cutting or water cutting, polishing the edge of the formed plate blank 6, and removing the defects such as burrs and flash;

step two: the contact parts of the upper die 7, the lower die 12, the core die 9 and the formed plate blank 6 are respectively subjected to insulation and heat insulation coating treatment, the insulation and heat insulation coatings are uniformly distributed by regulating and controlling treatment parameters, the thicknesses of all the parts are close, and the coating thickness is 5-10 mu m;

step three: respectively installing a limiting block 1 and a lower die 12 on an upper platform and a lower platform of a hydraulic machine, and then fixedly installing a supporting and positioning spring 13, an insulating base plate 4 and an adjusting block 5 under the limiting block 1 in sequence, wherein the insulating base plate 4 and the adjusting block 5 are connected by bolts or machinery, the supporting and positioning spring 13 plays a role in positioning and controlling the positions of the insulating base plate 4 and the adjusting block 5, an upper die 7 is respectively fixed on side cylinders of the hydraulic machine at two ends so as to enable the upper die to move along the horizontal direction, and a core die 9 is fixed on the other upper platform of the hydraulic machine through a connecting rod so as to enable the upper die to move along the vertical direction;

step four: two ends of a formed plate blank 6 are respectively fastened and connected with two electrodes 2, one side electrode 2 is connected with the positive pole of a power supply 3, the other side electrode 2 is connected with the negative pole of the power supply 3, so that a current loop is formed, the power supply 3 is kept closed during installation, two sides of the formed plate blank 6 are sprayed with a lubricant, and then the formed plate blank 6 is placed on a lower die according to the position;

step five: starting the hydraulic machine, moving the limiting block 1 downwards to enable the adjusting block 5 to be in contact with the formed slab 6, and applying vertical pressure to the formed slab 6 through the supporting and positioning spring 13 to avoid the phenomenon of sparking caused by current passing;

step six: the core mold moves downwards to be matched with the lower mold, so that the formed slab 6 is subjected to plastic deformation and bending, two sides of the formed slab 6 can be vertically lifted along the molded surface of the mold, and then an ultrathin insulating cushion layer is placed at the bending superposition part of the formed slab 6;

step seven: a power supply is switched on, the current is gradually increased, so that the temperature of the plastic deformation bending part of the formed plate blank 6 is quickly increased to reach the forming temperature of 600 ℃;

step eight: the upper die 7 moves towards the center to bend the formed slab inwards, and the upper die 7 moves to the position of a die assembly position; ensuring that the final die pasting can be realized at the bending part of the formed plate blank;

step nine: the limiting block 1 moves downwards, the upper die 7 deflects downwards by applying vertical pressure on the upper die 7, and then the formed plate blank 6 is subjected to plastic deformation until the upper die 7 and the lower die 12 are matched, and the forming process is completed;

step ten: after the power is electrified and the temperature is kept for 1min to 2min, controlling the power supply current to gradually decrease until the numerical value is zero, and turning off the power supply;

step eleven: the upper platform of the hydraulic machine moves upwards, the side cylinder retracts, the upper die 7 retracts along the horizontal direction, the forming core die 9 and the ultrathin insulating cushion layer 14 are drawn out along the lateral direction, the electrode 2 is separated from the formed slab 6, and the formed part is taken out.

Example 3

The local variable-temperature forming method of the linkage mold of the titanium alloy hoop component comprises the following specific steps:

the method comprises the following steps: according to the shape and size characteristics of the belt component, cutting the formed plate blank 6 into the shape and size to be processed by adopting methods such as laser cutting, linear cutting or water cutting, polishing the edge of the formed plate blank 6, and removing defects such as burrs and flashes;

step two: respectively carrying out insulating and heat-insulating coating treatment on the contact parts of the upper die 7, the lower die 12 and the core die 9 with the formed slab 6, and realizing uniform distribution of the insulating and heat-insulating coatings by regulating and controlling treatment parameters, wherein the thicknesses of all parts are close, and the thicknesses of the coatings are 700 mu m-800 mu m;

step three: the method comprises the following steps of respectively installing a limiting block 1 and a lower die 12 on an upper platform and a lower platform of a hydraulic press, and then fixedly installing a supporting and positioning spring 13, an insulating base plate 4 and an adjusting block 5 under the limiting block 1 in sequence, wherein the insulating base plate 4 and the adjusting block 5 are connected by bolts or machinery, the supporting and positioning spring 13 plays a role in positioning and controlling the positions of the insulating base plate 4 and the adjusting block 5, an upper die 7 is respectively fixed on side cylinders of the hydraulic press at two ends so as to enable the side cylinders to move along the horizontal direction, and a core die 9 is fixed on the other upper platform of the hydraulic press through a connecting rod so as to enable the core die to move along the vertical direction;

step four: two ends of a formed plate blank 6 are respectively fastened and connected with two electrodes 2, one side electrode 2 is connected with the positive pole of a power supply 3, the other side electrode 2 is connected with the negative pole of the power supply 3, so that a current loop is formed, the power supply 3 is kept closed during installation, two sides of the formed plate blank 6 are sprayed with a lubricant, and then the formed plate blank 6 is placed on a lower die according to the position;

step five: starting the hydraulic machine, moving the limiting block 1 downwards to enable the adjusting block 5 to be in contact with the formed slab 6, and applying vertical pressure to the formed slab 6 through the supporting and positioning spring 13 to avoid the phenomenon of sparking caused by current passing;

step six: the core mold moves downwards to be matched with the lower mold, so that the formed slab 6 is subjected to plastic deformation and bending, two sides of the formed slab 6 can be vertically lifted along the molded surface of the mold, and then an ultrathin insulating cushion layer is placed at the bending superposition part of the formed slab 6;

step seven: turning on a power supply, and gradually increasing the current to quickly raise the temperature of the plastic deformation bending part of the formed plate blank 6 to reach the forming temperature of 900 ℃;

step eight: the upper die 7 moves towards the center to bend the formed slab inwards, and the upper die 7 moves to the position of a die assembly position; ensuring that the final die pasting can be realized at the bending part of the formed plate blank;

step nine: the limiting block 1 moves downwards, the upper die 7 deflects downwards by applying vertical pressure on the upper die 7, and then the formed plate blank 6 is subjected to plastic deformation until the upper die 7 and the lower die 12 are matched, and the forming process is completed;

step ten: after the power is electrified and the temperature is kept for 8-10min, controlling the power supply current to gradually decrease until the value is zero, and turning off the power supply;

step eleven: the upper platform of the hydraulic press moves upwards, the side cylinder retracts, the upper die 7 retracts along the horizontal direction, the forming core die 9 and the ultrathin insulating cushion layer 14 are drawn out along the lateral direction, the electrode 2 is separated from the forming slab 6, and the formed part is taken out.

Example 4

The local variable-temperature forming method of the linkage mold of the titanium alloy hoop component comprises the following specific steps:

the method comprises the following steps: according to the shape and size characteristics of the belt component, cutting the formed plate blank 6 into the shape and size to be processed by adopting methods such as laser cutting, linear cutting or water cutting, polishing the edge of the formed plate blank 6, and removing defects such as burrs and flashes;

step two: respectively carrying out insulating and heat-insulating coating treatment on the contact parts of the upper die 7, the lower die 12 and the core die 9 with the formed slab 6, and realizing uniform distribution of the insulating and heat-insulating coatings by regulating and controlling treatment parameters, wherein the thicknesses of all parts are similar, and the thickness of the coatings is 100-500 mu m;

step three: respectively installing a limiting block 1 and a lower die 12 on an upper platform and a lower platform of a hydraulic machine, and then fixedly installing a supporting and positioning spring 13, an insulating base plate 4 and an adjusting block 5 under the limiting block 1 in sequence, wherein the insulating base plate 4 and the adjusting block 5 are connected by bolts or machinery, the supporting and positioning spring 13 plays a role in positioning and controlling the positions of the insulating base plate 4 and the adjusting block 5, an upper die 7 is respectively fixed on side cylinders of the hydraulic machine at two ends so as to enable the upper die to move along the horizontal direction, and a core die 9 is fixed on the other upper platform of the hydraulic machine through a connecting rod so as to enable the upper die to move along the vertical direction;

step four: two ends of a formed plate blank 6 are respectively fastened and connected with two electrodes 2, one side electrode 2 is connected with the positive pole of a power supply 3, the other side electrode 2 is connected with the negative pole of the power supply 3, so that a current loop is formed, the power supply 3 is kept closed during installation, two sides of the formed plate blank 6 are sprayed with a lubricant, and then the formed plate blank 6 is placed on a lower die according to the position;

step five: starting the hydraulic machine, moving the limiting block 1 downwards to enable the adjusting block 5 to be in contact with the formed slab 6, and applying vertical pressure to the formed slab 6 through the supporting and positioning spring 13 to avoid the phenomenon of sparking caused by current passing;

step six: the core mold moves downwards to be matched with the lower mold, so that the formed slab 6 is subjected to plastic deformation and bending, two sides of the formed slab 6 can be vertically lifted along the molded surface of the mold, and then an ultrathin insulating cushion layer is placed at the bending superposition part of the formed slab 6;

step seven: switching on a power supply, and gradually increasing the current to quickly raise the temperature of a plastic deformation bending part of the formed plate blank 6 to reach the forming temperature of 700-800 ℃;

step eight: the upper die 7 moves towards the center to bend the formed slab inwards, and the upper die 7 moves to the position of a die assembly position; ensuring that the final die pasting can be realized at the bending part of the formed plate blank;

step nine: the limiting block 1 moves downwards, the upper die 7 deflects downwards by applying vertical pressure on the upper die 7, and then the formed plate blank 6 is subjected to plastic deformation until the upper die 7 and the lower die 12 are matched, and the forming process is completed;

step ten: after electrifying and preserving heat for 5min to 7min, controlling the power supply current to gradually decrease until the value is zero, and turning off the power supply;

step eleven: the upper platform of the hydraulic machine moves upwards, the side cylinder retracts, the upper die 7 retracts along the horizontal direction, the forming core die 9 and the ultrathin insulating cushion layer 14 are drawn out along the lateral direction, the electrode 2 is separated from the formed slab 6, and the formed part is taken out.

Claims (3)

1. The utility model provides a local alternating temperature forming device of titanium alloy hoop class component linkage mould which characterized in that: the local variable-temperature forming device of the linkage mould of the titanium alloy hoop component comprises: the device comprises a hydraulic machine, a limiting block (1), an electrode (2), a power supply (3), an insulating base plate (4), a regulating block (5), an upper die (7), an upper die insulating and heat insulating layer (8), a core die (9), a lower die insulating and heat insulating layer (10), a temperature thermocouple (11), a lower die (12), a supporting and positioning spring (13) and an ultrathin insulating cushion layer (14); the limiting block (1) and the lower die (12) are fixedly connected with an upper platform and a lower platform of the hydraulic press respectively, the adjusting block (5) is connected with the insulating base plate (4), the adjusting block (5) and the insulating base plate (4) are connected with the limiting block (1) through a supporting and positioning spring (13), the upper die insulating and heat insulating layer (8) is connected to the outer side of the upper die (7), the lower die insulating and heat insulating layer (10) is connected to the outer side of the lower die (12), and the anode and the cathode of the electrode (2) are connected with two sides of the formed slab (6) respectively and form a loop with the power supply (3); the surface of the core mold (9) is provided with an insulating layer, the temperature thermocouple (11) is placed in a temperature measuring hole of the lower mold (12), and the ultrathin insulating cushion layer (14) is placed on the formed slab (6).

2. The titanium alloy hoop component linkage mold local temperature-changing forming device as claimed in claim 1, wherein: the upper die (7) only moves along the horizontal direction and can rotate around the tail part of the upper die.

3. A local variable-temperature forming method of a linkage mold of a titanium alloy hoop component is characterized by comprising the following steps of: the local variable-temperature forming method of the linkage mold of the titanium alloy hoop component comprises the following specific steps of:

the method comprises the following steps: cutting the formed plate blank (6) according to the shape and size characteristics of the belt component;

step two: respectively carrying out insulating and heat-insulating coating treatment on the contact parts of the upper die (7), the lower die (12), the core die (9) and the formed slab (6), wherein the thickness of the coating is 5-800 mu m;

step three: the hydraulic press is characterized in that a limiting block (1), a supporting and positioning spring (13), an insulating base plate (4), an adjusting block (5), upper dies (7), a core die (9) and a lower die (12) are sequentially arranged on the hydraulic press, wherein the limiting block (1) is arranged on an upper platform of the hydraulic press, the limiting block (1), the supporting and positioning spring (13), the insulating base plate (4) and the adjusting block (5) are sequentially and fixedly connected, the two upper dies (7) are respectively fixed on side cylinders of the hydraulic press at two ends, the core die (9) is fixed on the other upper platform of the hydraulic press through a connecting rod, and the lower die (12) is fixed on a lower platform of the hydraulic press;

step four: two ends of a formed slab (6) are respectively and tightly connected with two electrodes (2), one side electrode (2) is connected with the positive electrode of a power supply (3), the other side electrode (2) is connected with the negative electrode of the power supply (3), the formed slab (6) is placed on a lower die (12) according to the position, and the current value range of the power supply (3) is 0A to 20000A;

step five: starting a hydraulic machine, moving a limiting block (1) downwards to enable an adjusting block (5) to be in contact with a formed slab (6), and applying vertical pressure to the formed slab (6) through a supporting and positioning spring (13);

step six: the core mold (9) moves downwards to be matched with the lower mold (12) to bend the formed slab, two sides of the formed slab can be vertically lifted, and then an ultrathin insulating cushion layer (14) is placed at the bending superposition position of the formed slab (6);

step seven: a power supply (3) is switched on, so that the bent part of the formed plate blank (6) is heated to 600-900 ℃;

step eight: the upper die (7) moves towards the center to bend the formed slab inwards, and the upper die (7) moves to the position of a die assembly position;

step nine: the limiting block (1) moves downwards, and the formed slab (6) is subjected to plastic deformation through vertical pressure applied to the upper die (7) until the upper die (7) and the lower die (12) are matched;

step ten: after the power is electrified and the temperature is kept for 1min to 10min, controlling a power supply to gradually reduce the current until the current returns to zero, and turning off the power supply;

step eleven: and (3) moving an upper platform of the hydraulic machine upwards, withdrawing the upper die (7) along the horizontal direction, laterally withdrawing the forming core die (9) and the ultrathin insulating cushion layer (14), separating the electrode (2) from the formed slab (6), and taking out the formed part.

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