Continuous bulging machining method for titanium alloy cylindrical part at high temperature

Abstract

According to the continuous bulging machining method for the titanium alloy cylindrical part at the high temperature, hot pressing forming equipment with a moving-out workbench is used as a pressing force application device, a moving-out platform is adopted, a mold is convenient to place, parts are convenient to take and place, and the maximum opening height needed by the equipment during part taking is reduced; and meanwhile, a forced return and return in-place detection device is designed for return of the equipment ejector rod and is used for preventing fatal damage to the mold due to the fact that the equipment ejector rod does not return to the lower limit. Compared with the prior art, the continuous bulging machining method for the titanium alloy cylindrical part at the high temperature has the beneficial effects that the machining circulation of large titanium alloy cylinder feeding, mold returning to a hot press, heat preservation, pressing bulging, workpiece demolding, mold and workpiece moving-out and automatic discharging can be achieved. The forming efficiency of the large titanium alloy cylindrical part is improved, the machining cost is reduced, meanwhile, the labor intensity of an operator is reduced, and working conditions are improved.

Description

Technical Field

[0001] The invention relates to the field of continuous thermal expansion of titanium alloy cylindrical parts at high temperatures, and in particular to a continuous expansion processing method for titanium alloy cylindrical parts at high temperatures. Background Art

[0002] The expansion of cylindrical parts at room temperature is a common conventional technology. The hot expansion of materials that are difficult to form at room temperature has also been applied to a certain extent. However, the hot expansion technology of cylindrical parts at high temperature generally has the following problems:

[0003] 1) Parts cannot be demoulded in a high temperature environment above 700°C, and parts cannot be picked up and placed at high temperatures;

[0004] 2) The parts and bulging molds need to be heated and cooled simultaneously with the hot pressing forming equipment, which results in a long processing cycle and high cost;

[0005] 3) Long-term heating causes severe surface oxidation of parts and grain growth of materials;

[0006] 4) The parts are large and cannot be removed manually at high temperatures;

[0007] 5) Titanium alloy cylinders are mostly thin-walled parts, the material strength is low at high temperatures, and the parts are easily deformed when removed at high temperatures.

[0008] At present, the hot expansion of titanium alloy cylindrical parts adopts the technical solutions of multiple heat setting or hot expansion of parts as the furnace heats up and cools down. The processing efficiency is low and the cost is high, which makes it difficult to meet the processing needs of mass production. Summary of the invention

[0009] The purpose of the present invention is to develop a process for the continuous bulging production of titanium alloy cylinders at high temperatures of 600 to 900°C, to realize the process of high-temperature placement of blanks, high-temperature bulging, high-temperature part demoulding and high-temperature part removal, and to provide a method for continuous bulging processing of titanium alloy cylinders at high temperatures.

[0010] The present invention provides a continuous bulging processing method for titanium alloy cylindrical parts at high temperature, which is characterized by:

[0011] A hot pressing forming device with a removable workbench is used as a pressing force device, and a removable platform is adopted to facilitate the placement of molds and the removal of parts, reducing the maximum opening height required for the equipment when taking parts; at the same time, the retraction design of the equipment's ejector rod has a forced retraction and retraction in place detection device to prevent fatal damage to the mold due to the equipment's ejector rod not returning to the lower limit.

[0012] Including the bulging die structure for demoulding large titanium alloy cylindrical parts at high temperature:

[0013] The mold is made of heat-resistant steel and can work for a long time at 600-900℃.

[0014] The cone angle of the outer side of the mold expansion core, i.e. the inner side of the expansion flap, is less than 7.5°, which effectively reduces the friction force on the lower surface of the expansion flap and the rollover force of the expansion flap during operation, thus increasing the life of the mold.

[0015] The mold uses the ejector force of the equipment to achieve the retraction of the expansion petals: the wedge block fixed to an integral circular ring in the mold is moved upward, and the corresponding force is applied to the groove with the same taper on the expansion petal, so that the vertical force is converted into horizontal force to achieve the retraction of the expansion petal. The number of wedge blocks ejected from the mold is consistent with the number of expansion petals, and each wedge block corresponds to the middle position of two expansion petals. They are staggered and force is applied to the expansion petals, making the retraction of the expansion petals more uniform and reliable.

[0016] A double-station robotic arm with a clamping mechanism is used as a handling mechanism for automatic loading and unloading at high temperatures. Parts and raw materials can be picked up and placed synchronously at high temperatures of 600 to 900°C, which improves efficiency and reduces heat loss.

[0017] By utilizing hot pressing forming equipment with a removal workbench, we have developed a bulging mold structure that can realize part demoulding at high temperature, as well as a clamping and handling mechanism that can complete the loading and unloading of large thin-walled parts at high temperature. Under program control, the processing cycle of high-temperature mold removal, titanium alloy cylinder loading, mold transfer back to the hot press, heat preservation, bulging pressing, workpiece demoulding, mold and workpiece removal, and automatic unloading is automatically completed.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The continuous bulging processing method for titanium alloy cylindrical parts at high temperature described in the present invention can realize the processing cycle of loading large titanium alloy cylinders, moving the mold back to the hot press, heat preservation, pressing and bulging, demolding the workpiece, moving the mold and the workpiece out, and automatic unloading. It improves the forming efficiency of large titanium alloy cylindrical parts, reduces processing costs, and at the same time reduces the labor intensity of operators and improves working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0021] Figure 1 For the process flow;

[0022] Figure 2 It is a mold device that can realize part demoulding at high temperature;

[0023] In the figure, 1- expansion core, 2- expansion petal, 3- wedge ring, 4- support seat, 5- push rod. DETAILED DESCRIPTION

[0024] The present invention will be further explained below in conjunction with specific implementation plans, but the present invention is not limited thereto. The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0025] The present invention provides a continuous bulging processing method for titanium alloy cylindrical parts at high temperature, which is characterized by:

[0026] A hot pressing forming device with a removable workbench is used as a pressing force device, and a removable platform is adopted to facilitate the placement of molds and the removal of parts, reducing the maximum opening height required for the equipment when taking parts; at the same time, the retraction design of the equipment's ejector rod has a forced retraction and retraction in place detection device to prevent fatal damage to the mold due to the equipment's ejector rod not returning to the lower limit.

[0027] Including the bulging die structure for demoulding large titanium alloy cylindrical parts at high temperature:

[0028] The mold is made of heat-resistant steel and can work for a long time at 600-900℃.

[0029] The cone angle of the outer side of the mold expansion core, i.e. the inner side of the expansion flap, is less than 7.5°, which effectively reduces the friction force on the lower surface of the expansion flap and the rollover force of the expansion flap during operation, thus increasing the life of the mold.

[0030] The mold uses the ejector force of the equipment to achieve the retraction of the expansion petals: the wedge block fixed to an integral circular ring in the mold is moved upward, and the corresponding force is applied to the groove with the same taper on the expansion petal, so that the vertical force is converted into horizontal force to achieve the retraction of the expansion petal. The number of wedge blocks ejected from the mold is consistent with the number of expansion petals, and each wedge block corresponds to the middle position of two expansion petals. They are staggered and force is applied to the expansion petals, making the retraction of the expansion petals more uniform and reliable.

[0031] A double-station robotic arm with a clamping mechanism is used as a handling mechanism for automatic loading and unloading at high temperatures. Parts and raw materials can be picked up and placed synchronously at high temperatures of 600 to 900°C, which improves efficiency and reduces heat loss.

[0032] By utilizing hot pressing forming equipment with a removal workbench, we have developed a bulging mold structure that can realize part demoulding at high temperature, as well as a clamping and handling mechanism that can complete the loading and unloading of large thin-walled parts at high temperature. Under program control, the processing cycle of high-temperature mold removal, titanium alloy cylinder loading, mold transfer back to the hot press, heat preservation, bulging pressing, workpiece demoulding, mold and workpiece removal, and automatic unloading is automatically completed.

[0033] Matters not covered by the present invention are known technologies.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for continuous bulging of titanium alloy cylindrical parts at high temperature, characterized in that: The hot pressing forming equipment with a moving workbench is used as the pressing force device. The moving platform is used to facilitate the placement of molds and the removal of parts, and reduce the maximum opening height required for the equipment when taking parts. At the same time, the retraction design of the equipment ejector rod is equipped with a forced retraction and retraction detection device to prevent fatal damage to the mold due to the equipment ejector rod not returning to the lower limit; Including the bulging die structure for demoulding large titanium alloy cylindrical parts at high temperature: the whole die is made of heat-resistant steel material and can work for a long time at 600-900℃; the cone angle of the outer side of the die expansion core, i.e. the inner side of the expansion flap, is less than 7.5°; The mold uses the ejector force of the equipment ejector rod to achieve the retreat of the expansion petals: the wedges fixed to an integral ring in the mold move upward, and the corresponding force is applied to the grooves with the same taper on the expansion petals, so that the vertical force is converted into horizontal force to achieve the retreat of the expansion petals. The number of ejector wedges of the mold is the same as the number of expansion petals, and each wedge corresponds to the middle position of two expansion petals, and they are staggered. A double-station robotic arm with a clamping mechanism is used as a handling mechanism for automatic loading and unloading at high temperatures. Parts and raw materials can be picked up and placed synchronously at high temperatures of 600 to 900°C, which improves efficiency and reduces heat loss.

2. The continuous bulging processing method for titanium alloy cylindrical parts at high temperature according to claim 1 is characterized in that: It uses hot pressing forming equipment with a removal workbench, a bulging mold structure that realizes part demoulding at high temperature, and a clamping and handling mechanism that completes the loading and unloading of large thin-walled parts at high temperature. Under program control, it automatically completes the processing cycle of high-temperature mold removal, titanium alloy cylinder loading, mold transfer back to the hot press, heat preservation, bulging, workpiece demoulding, mold and workpiece removal, and automatic unloading.

Images