技术领域technical field
本实用新型涉及金属材料加工领域，特别是一种镁合金精密管材控温拉拔机构。The utility model relates to the field of metal material processing, in particular to a temperature-controlled drawing mechanism for precision magnesium alloy pipes.
背景技术Background technique
镁合金具有密度低、热传导率高、阻尼效果佳、易切削等优点，被看作是本世纪最具开发应用前景的工程材料，已经在航空、航天、汽车、医疗器械等诸多领域获得应用。由于比强度高、可降解吸收的特点，镁合金被看做是未来新型医疗器械的最佳候选材料之一，尤其是近期可降解心血管支架的革新发展，更是促进了镁合金在医疗器械领域的研究进展。但是，镁及镁合金的密排六方晶体结构，使得其在变形过程中，滑移系开动较少，影响了其塑性变形能力。因此，镁合金作为器件材料，大都通过锻造、挤压、拉拔、轧制等工艺进行成型加工，而且相对合理的变形温度对镁合金的成型是十分有利的。然而，目前针对镁合金的加工基本采用先预热然后进行加工，这样在加工过程中由于热量散失导致材料失温，从而影响镁合金的变形能力。因此，在镁合金的变形过程中，通过对镁合金温度的控制，来实现材料精准变形。基于这样一个思路，有必要在镁合金变形过程中对其进行合理的加热及自动控温，以保证镁合金在特定的温度范围内进行变形，以有效地调整镁合金的变形行为。Magnesium alloy has the advantages of low density, high thermal conductivity, good damping effect, and easy cutting. It is regarded as the engineering material with the most development and application prospects in this century. It has been applied in many fields such as aviation, aerospace, automobiles, and medical equipment. Due to the characteristics of high specific strength and degradable absorption, magnesium alloy is regarded as one of the best candidate materials for new medical devices in the future, especially the recent innovation and development of degradable cardiovascular stents, which has promoted the application of magnesium alloy in medical devices. research progress in the field. However, the close-packed hexagonal crystal structure of magnesium and magnesium alloys makes the slip system less active during the deformation process, which affects its plastic deformation ability. Therefore, as a device material, magnesium alloys are mostly formed by forging, extrusion, drawing, rolling and other processes, and a relatively reasonable deformation temperature is very beneficial to the forming of magnesium alloys. However, the current processing of magnesium alloys basically adopts preheating first and then processing, so that the material loses temperature due to heat loss during processing, thereby affecting the deformation ability of magnesium alloys. Therefore, in the deformation process of magnesium alloy, the precise deformation of the material can be realized by controlling the temperature of the magnesium alloy. Based on such an idea, it is necessary to carry out reasonable heating and automatic temperature control during the deformation process of magnesium alloys to ensure that magnesium alloys are deformed within a specific temperature range, so as to effectively adjust the deformation behavior of magnesium alloys.
镁合金管材是新型血管支架开发的重要原材料，其对管材的尺寸精度要求很高。目前针对这种镁合金精密管材的加工主要是拉拔，而在拉拔过程中，温度的影响非常重要。在室温条件下，由于拉拔模的减径变形，会在管材内表面产生明显的形变累积效应，而室温下镁合金低的变形能力会导致形变累积的阶段性释放，从而在内表面产生皱褶及凹凸形态，影响管材质量。然而，随着变形温度的提高，镁合金的形变塑性将会明显改善，而且在合理的温度范围内，镁合金可以获得最佳的变形性能和强度的匹配，所以控制镁合金变形温度对提高管材质量是非常有意义。因此，基于实际的需要，开发一种镁合金控温拉拔工艺及其相应的控温拉拔机构是非常有价值的，其可以提高镁合金精密管材的精度和生产效率，对新型可降解医疗器械的开发也是极具意义的。Magnesium alloy tubing is an important raw material for the development of new vascular stents, which requires high dimensional accuracy of the tubing. At present, the processing of this magnesium alloy precision pipe is mainly drawing, and in the drawing process, the influence of temperature is very important. At room temperature, due to the diameter-reducing deformation of the drawing die, there will be an obvious deformation accumulation effect on the inner surface of the pipe, and the low deformation capacity of magnesium alloys at room temperature will lead to the gradual release of deformation accumulation, resulting in wrinkles on the inner surface. The pleats and concave-convex shape affect the quality of the pipe. However, as the deformation temperature increases, the deformation plasticity of magnesium alloys will be significantly improved, and within a reasonable temperature range, magnesium alloys can obtain the best matching of deformation performance and strength, so controlling the deformation temperature of magnesium alloys is very important for improving the pipe quality. Quality is very meaningful. Therefore, based on actual needs, it is very valuable to develop a magnesium alloy temperature-controlled drawing process and its corresponding temperature-controlled drawing mechanism, which can improve the precision and production efficiency of magnesium alloy precision tubes, and is useful for new degradable medical products. Device development is also of great significance.
有鉴于此，本实用新型的目的在于提供一种新的技术方案以解决现存的技术缺陷。In view of this, the purpose of this utility model is to provide a new technical solution to solve the existing technical defects.
实用新型内容Utility model content
为了克服现有技术的不足，本实用新型提供一种镁合金精密管材控温拉拔机构，解决了现有技术存在的镁合金拉拔变形能力差、镁合金管材表面容易产生皱褶及凹凸形态、管材拉拔质量差等技术缺陷。In order to overcome the deficiencies of the prior art, the utility model provides a magnesium alloy precision pipe temperature-controlled drawing mechanism, which solves the poor drawing deformation ability of the magnesium alloy and the easy generation of wrinkles and concave-convex shapes on the surface of the magnesium alloy pipe in the prior art. , Poor drawing quality of pipes and other technical defects.
本实用新型解决其技术问题所采用的技术方案是：The technical scheme that the utility model solves its technical problem adopts is:
一种镁合金精密管材控温拉拔工艺，包括以下工艺步骤：A temperature-controlled drawing process for magnesium alloy precision tubes, comprising the following process steps:
步骤一：加工坯头，先将镁合金管坯的坯头进行感应加热至200-250℃，进行捻头加工，然后将涂有高温润滑油脂的内芯模放入镁合金管坯内腔；Step 1: Processing the billet head, first induction heating the billet head of the magnesium alloy tube billet to 200-250°C, performing twisting processing, and then putting the inner mandrel coated with high-temperature lubricating grease into the inner cavity of the magnesium alloy tube billet;
步骤二：型模与镁合金管坯的配合，将装配好的镁合金管坯放入涂有高温润滑油脂的拉拔外型模的内模腔，并使所述内芯模前端位于拉拔外型模的内模腔内，镁合金管坯的捻头部位固定在拉拔头上，所述内芯模末端固定在拉拔设备，并通过激光定位，使内芯模的轴线和拉拔外型模的内模腔的轴线相重合；Step 2: Cooperate between the mold and the magnesium alloy tube blank, put the assembled magnesium alloy tube blank into the inner mold cavity of the drawing outer mold coated with high-temperature lubricating grease, and make the front end of the inner core mold at the drawing In the inner mold cavity of the outer mold, the twist head part of the magnesium alloy tube blank is fixed on the drawing head, and the end of the inner mandrel is fixed on the drawing equipment, and is positioned by laser so that the axis of the inner mandrel and the drawing The axes of the inner mold cavity of the outer mold coincide with each other;
步骤三：温控拉拔，设定对镁合金管坯的感应加热温度为210-280℃，以10-30 L/min速率对镁合金管坯感应加热的空间通入氩气并持续1-5分钟，然后开始对镁合金管坯加热，待镁合金管坯的温度稳定后开始对镁合金管坯进行拉拔；Step 3: temperature-controlled drawing, set the induction heating temperature of the magnesium alloy tube blank to 210-280 ° C, and pass argon gas into the space of the magnesium alloy tube blank induction heating at a rate of 10-30 L/min for 1- 5 minutes, then start heating the magnesium alloy tube blank, and start drawing the magnesium alloy tube blank after the temperature of the magnesium alloy tube blank is stable;
步骤四：热处理，每两道次加工后对已经加工完成的镁合金管进行真空退火处理；Step 4: heat treatment, vacuum annealing treatment is performed on the processed magnesium alloy tube after every two passes of processing;
步骤五：矫直及表面抛光处理，拉拔加工后得到的镁合金管经矫直及表面清洗抛光后获得最终镁合金管材产品。Step 5: Straightening and surface polishing treatment. The magnesium alloy tube obtained after the drawing process is straightened and surface cleaned and polished to obtain the final magnesium alloy tube product.
作为上述技术方案的改进，所述步骤一中，采用感应加热的方法对镁合金管坯的坯头部位进行加热并将镁合金管坯的坯头部位加热至220℃。As an improvement of the above technical solution, in the first step, the billet head part of the magnesium alloy tube blank is heated by induction heating and the billet head part of the magnesium alloy tube blank is heated to 220°C.
作为上述技术方案的进一步改进，所述步骤三中，对镁合金管坯的拉拔速率为150-600 mm/min，所述镁合金管坯每道次拉拔的变形量为10-30%。As a further improvement of the above technical solution, in the third step, the drawing rate of the magnesium alloy tube blank is 150-600 mm/min, and the deformation amount of the magnesium alloy tube blank per drawing is 10-30% .
作为上述技术方案的进一步改进，所述步骤三中，镁合金管坯拉拔过程中其温度波动在±5℃。As a further improvement of the above technical solution, in the third step, the temperature fluctuation of the magnesium alloy tube blank during the drawing process is within ±5°C.
作为上述技术方案的进一步改进，所述步骤四中，拉拔成型的镁合金管的退火温度为300-360℃，镁合金管的退火时间为10-20min。As a further improvement of the above technical solution, in the fourth step, the annealing temperature of the drawn magnesium alloy tube is 300-360° C., and the annealing time of the magnesium alloy tube is 10-20 min.
作为上述技术方案的进一步改进，拉拔成型的镁合金管材的屈服强度为150-220MPa，镁合金管材的抗拉强度250-290MPa，镁合金管材的的外径尺寸误差在±0.04mm。As a further improvement of the above technical solution, the yield strength of the drawn magnesium alloy pipe is 150-220MPa, the tensile strength of the magnesium alloy pipe is 250-290MPa, and the error of the outer diameter of the magnesium alloy pipe is ±0.04mm.
本实用新型还提供了一种镁合金精密管材控温拉拔机构，包括拉拔外型模及配合所述拉拔外型模的内芯模，所述拉拔外型模具有内模腔，所述内芯模可穿过所述内模腔并配合所述拉拔外型模将镁合金管坯拉拔成型为镁合金管材，所述拉拔外型模一侧设置有线圈固定装置，所述线圈固定装置上固定设置有感应加热线圈，拉拔外型模内部开设有电偶安装孔，所述电偶安装孔中安装有测温热电偶，所述测温热电偶和感应加热线圈配合组构成为所述镁合金精密管材控温拉拔机构的自动控温装置，拉拔外型模的一侧设置有气氛保护罩，所述气氛保护罩上设置有氩气输入管，所述线圈固定装置及感应加热线圈位于所述气氛保护罩内部。The utility model also provides a magnesium alloy precision pipe temperature-controlled drawing mechanism, including a drawing outer mold and an inner core mold matching the drawing outer mold, the drawing outer mold has an inner mold cavity, The inner core mold can pass through the inner mold cavity and cooperate with the drawing outer mold to draw and form the magnesium alloy tube blank into a magnesium alloy pipe. One side of the drawing outer mold is provided with a coil fixing device, An induction heating coil is fixedly arranged on the coil fixing device, and a thermocouple installation hole is opened inside the drawing outer mold, and a temperature measuring thermocouple is installed in the thermocouple installation hole, and the temperature measuring thermocouple and the induction heating coil Cooperate with the automatic temperature control device of the magnesium alloy precision pipe temperature control drawing mechanism, one side of the drawing mold is provided with an atmosphere protection cover, and the atmosphere protection cover is provided with an argon gas input pipe. The coil fixing device and the induction heating coil are located inside the atmosphere shield.
作为上述技术方案的改进，所述拉拔外型模的内模腔两端分别设置有大圆弧过渡坡面结构及小圆弧过渡坡面结构，所述内模腔为中空圆柱状通腔。As an improvement of the above technical solution, the two ends of the inner mold cavity of the drawing outer mold are respectively provided with a large arc transition slope structure and a small arc transition slope structure, and the inner mold cavity is a hollow cylindrical through cavity .
作为上述技术方案的进一步改进，所述测温热电偶的距离待拉拔的镁合金管坯的垂直距离为1.5-2.5mm，所述感应加热线圈的直径30-60mm，感应加热线圈的长度50-150mm。As a further improvement of the above technical solution, the vertical distance between the temperature measuring thermocouple and the magnesium alloy tube blank to be drawn is 1.5-2.5 mm, the diameter of the induction heating coil is 30-60 mm, and the length of the induction heating coil is 50 mm. -150mm.
作为上述技术方案的进一步改进，所述内芯模为细长圆棒，内芯模的一端固定在拉拔设备上，内芯模的另一端置入拉拔外型模的内模腔内，所述拉拔外型模的内模腔的轴线和内芯模的轴线重合，所述气氛保护罩上的氩气输入管具有多个，多个氩气输入管沿着气氛保护罩径向相互间隔60°分布。As a further improvement of the above technical solution, the inner mandrel is a slender round rod, one end of the inner mandrel is fixed on the drawing equipment, and the other end of the inner mandrel is placed in the inner mold cavity of the outer drawing mould, so The axis of the inner mold cavity of the drawing outer mold coincides with the axis of the inner core mold, and there are multiple argon gas inlet pipes on the atmosphere protection cover, and the plurality of argon gas input pipes are radially spaced apart from each other along the atmosphere protection cover 60° distribution.
本实用新型的有益效果是：本实用新型提供了一种镁合金精密管材控温拉拔机构，通过该种镁合金精密管材控温拉拔机构可在加工镁合金管材过程够保证镁合金管坯在控温的环境下进行拉拔管材工作，在恒定高温的环境下能够有效提升镁合金管坯的拉拔变形能力，避免镁合金管材表面出现皱褶及凹凸变形，极大提升了镁合金管材的加工质量，有效提升了镁合金管材的市场竞争力，拓展了其应用范围，用户体验更好。The beneficial effects of the utility model are: the utility model provides a magnesium alloy precision pipe temperature-controlled drawing mechanism, through which the magnesium alloy precision pipe temperature-controlled drawing mechanism can ensure the magnesium alloy tube billet in the process of processing the magnesium alloy pipe Drawing pipes in a temperature-controlled environment can effectively improve the drawing deformation ability of magnesium alloy pipe blanks in a constant high temperature environment, avoid wrinkles and concave-convex deformation on the surface of magnesium alloy pipes, and greatly improve the quality of magnesium alloy pipes. The processing quality has effectively improved the market competitiveness of magnesium alloy pipes, expanded its application range, and provided better user experience.
总之，该种镁合金精密管材控温拉拔机构解决了现有技术存在的镁合金拉拔变形能力差、镁合金管材表面容易产生皱褶及凹凸形态、管材拉拔质量差等技术缺陷。In a word, this magnesium alloy precision pipe temperature-controlled drawing mechanism solves technical defects such as poor drawing deformation ability of magnesium alloy, easy generation of wrinkles and concave-convex shapes on the surface of magnesium alloy pipe, and poor drawing quality of the pipe in the prior art.
附图说明Description of drawings
下面结合附图和实施例对本实用新型进一步说明。Below in conjunction with accompanying drawing and embodiment the utility model is further described.
图1是本实用新型中镁合金精密管材控温拉拔机构的装配示意图。Fig. 1 is a schematic diagram of the assembly of the temperature-controlled drawing mechanism for magnesium alloy precision pipes in the utility model.
具体实施方式Detailed ways
以下将结合实施例和附图对本实用新型的构思、具体结构及产生的技术效果进行清楚、完整地描述，以充分地理解本实用新型的目的、特征和效果。显然，所描述的实施例只是本实用新型的一部分实施例，而不是全部实施例，基于本实用新型的实施例，本领域的技术人员在不付出创造性劳动的前提下所获得的其他实施例，均属于本实用新型保护的范围。另外，专利中涉及到的所有联接/连接关系，并非单指构件直接相接，而是指可根据具体实施情况，通过添加或减少联接辅件，来组成更优的联接结构。本实用新型创造中的各个技术特征，在不互相矛盾冲突的前提下可以交互组合，参照图1。The idea, specific structure and technical effects of the present utility model will be clearly and completely described below in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, characteristics and effects of the present utility model. Apparently, the described embodiments are only some of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without paying creative efforts, All belong to the protection scope of the utility model. In addition, all the connection/connection relationships involved in the patent do not simply refer to the direct connection of components, but mean that a better connection structure can be formed by adding or reducing connection accessories according to specific implementation conditions. The various technical features in the invention of the utility model can be combined interactively under the premise of not conflicting with each other, refer to Fig. 1 .
一种镁合金精密管材控温拉拔工艺，包括以下工艺步骤：A temperature-controlled drawing process for magnesium alloy precision tubes, comprising the following process steps:
步骤一：加工坯头，先将镁合金管坯2的坯头进行感应加热至200-250℃，进行捻头加工，然后将涂有高温润滑油脂的内芯模1放入镁合金管坯2内腔；Step 1: Processing the billet head, first induction heating the billet head of the magnesium alloy tube blank 2 to 200-250°C, performing twisting processing, and then putting the inner core mold 1 coated with high-temperature lubricating grease into the magnesium alloy tube billet 2 lumen;
步骤二：型模与镁合金管坯2的配合，将装配好的镁合金管坯2放入涂有高温润滑油脂的拉拔外型模3的内模腔，并使所述内芯模1前端位于拉拔外型模3的内模腔内，镁合金管坯2的捻头部位固定在拉拔头上，所述内芯模1末端固定在拉拔设备，并通过激光定位，使内芯模2的轴线和拉拔外型模3的内模腔的轴线相重合；Step 2: Cooperate the mold with the magnesium alloy tube blank 2, put the assembled magnesium alloy tube blank 2 into the inner mold cavity of the drawing outer mold 3 coated with high-temperature lubricating grease, and make the inner core mold 1 The front end is located in the inner mold cavity of the drawing outer mold 3, the twist head part of the magnesium alloy tube blank 2 is fixed on the drawing head, and the end of the inner mandrel 1 is fixed on the drawing equipment, and is positioned by laser, so that The axis of the inner mandrel 2 coincides with the axis of the inner mold cavity of the drawing outer mold 3;
步骤三：温控拉拔，设定对镁合金管坯2的感应加热温度为210-280℃，以10-30 L/min速率对镁合金管坯2感应加热的空间通入氩气并持续1-5分钟，然后开始对镁合金管坯2加热，待镁合金管坯2的温度稳定后开始对镁合金管坯2进行拉拔；Step 3: temperature-controlled drawing, set the induction heating temperature of the magnesium alloy tube blank 2 to 210-280°C, and pass argon gas into the induction heating space of the magnesium alloy tube blank 2 at a rate of 10-30 L/min and continue 1-5 minutes, then start heating the magnesium alloy tube blank 2, and start drawing the magnesium alloy tube blank 2 after the temperature of the magnesium alloy tube blank 2 is stable;
步骤四：热处理，每两道次加工后对已经加工完成的镁合金管进行真空退火处理；Step 4: heat treatment, vacuum annealing treatment is performed on the processed magnesium alloy tube after every two passes of processing;
步骤五：矫直及表面抛光处理，拉拔加工后得到的镁合金管经矫直及表面清洗抛光后获得最终镁合金管材产品。Step 5: Straightening and surface polishing treatment. The magnesium alloy tube obtained after the drawing process is straightened and surface cleaned and polished to obtain the final magnesium alloy tube product.
优选地，所述步骤一中，采用感应加热的方法对镁合金管坯2的坯头部位进行加热并将镁合金管坯2的坯头部位加热至220℃。Preferably, in the first step, induction heating is used to heat the billet head portion of the magnesium alloy tube blank 2 and the billet head portion of the magnesium alloy tube blank 2 is heated to 220°C.
优选地，所述步骤三中，对镁合金管坯2的拉拔速率为150-600 mm/min，所述镁合金管坯2每道次拉拔的变形量为10-30%。Preferably, in the third step, the drawing rate of the magnesium alloy tube blank 2 is 150-600 mm/min, and the deformation of the magnesium alloy tube blank 2 per drawing pass is 10-30%.
优选地，所述步骤三中，镁合金管坯2拉拔过程中其温度波动在±5℃。Preferably, in the third step, the temperature fluctuation of the magnesium alloy tube blank 2 during the drawing process is within ±5°C.
优选地，所述步骤四中，拉拔成型的镁合金管的退火温度为300-360℃，镁合金管的退火时间为10-20min。Preferably, in the step four, the annealing temperature of the drawn magnesium alloy tube is 300-360° C., and the annealing time of the magnesium alloy tube is 10-20 min.
优选地，拉拔成型的镁合金管材的屈服强度为150-220MPa，镁合金管材的抗拉强度250-290MPa，镁合金管材的的外径尺寸误差在±0.04mm。Preferably, the yield strength of the drawn magnesium alloy pipe is 150-220MPa, the tensile strength of the magnesium alloy pipe is 250-290MPa, and the error of the outer diameter of the magnesium alloy pipe is ±0.04mm.
基于上述的镁合金精密管材控温拉拔工艺，本实用新型还提供了一种镁合金精密管材控温拉拔机构，包括拉拔外型模3及配合所述拉拔外型模3的内芯模1，所述拉拔外型模3具有内模腔，所述内芯模1可穿过所述内模腔并配合所述拉拔外型模3将镁合金管坯2拉拔成型为镁合金管材，所述拉拔外型模3一侧设置有线圈固定装置4，所述线圈固定装置4上固定设置有感应加热线圈5，拉拔外型模3内部开设有电偶安装孔，所述电偶安装孔中安装有测温热电偶6，所述测温热电偶6和感应加热线圈5配合组构成为所述镁合金精密管材控温拉拔机构的自动控温装置，拉拔外型模3的一侧设置有气氛保护罩7，所述气氛保护罩7上设置有氩气输入管8，所述线圈固定装置4及感应加热线圈5位于所述气氛保护罩7内部。Based on the above-mentioned temperature-controlled drawing process for magnesium alloy precision pipes, the utility model also provides a temperature-controlled drawing mechanism for magnesium alloy precision pipes, which includes a drawing outer mold 3 and an inner drawing mold 3 that cooperates with the drawing outer mold 3. The core mold 1, the drawing outer mold 3 has an inner mold cavity, the inner core mold 1 can pass through the inner mold cavity and cooperate with the drawing outer mold 3 to draw and form the magnesium alloy tube blank 2 It is a magnesium alloy pipe material, a coil fixing device 4 is arranged on one side of the drawing outer mold 3, an induction heating coil 5 is fixedly arranged on the coil fixing device 4, and a galvanic couple installation hole is opened inside the drawing outer mold 3 , the temperature measuring thermocouple 6 is installed in the couple installation hole, and the temperature measuring thermocouple 6 and the induction heating coil 5 cooperate to form an automatic temperature control device of the magnesium alloy precision pipe temperature control drawing mechanism, and the drawing An atmosphere protection cover 7 is arranged on one side of the outer mold 3, and an argon gas input pipe 8 is arranged on the atmosphere protection cover 7, and the coil fixing device 4 and the induction heating coil 5 are located inside the atmosphere protection cover 7.
优选地，所述拉拔外型模3的内模腔两端分别设置有大圆弧过渡坡面结构31及小圆弧过渡坡面结构32，所述内模腔为中空圆柱状通腔。Preferably, both ends of the inner mold cavity of the drawing outer mold 3 are respectively provided with a large arc transition slope structure 31 and a small arc transition slope structure 32, and the inner mold cavity is a hollow cylindrical through cavity.
优选地，所述测温热电偶6的距离待拉拔的镁合金管坯2的垂直距离为1.5-2.5mm，所述感应加热线圈5的直径30-60mm，感应加热线圈5的长度50-150mm。Preferably, the vertical distance between the temperature measuring thermocouple 6 and the magnesium alloy tube blank 2 to be drawn is 1.5-2.5 mm, the diameter of the induction heating coil 5 is 30-60 mm, and the length of the induction heating coil 5 is 50-2.5 mm. 150mm.
优选地，所述内芯模1为细长圆棒，内芯模1的一端固定在拉拔设备上，内芯模1的另一端置入拉拔外型模3的内模腔内，所述拉拔外型模3的内模腔的轴线和内芯模1的轴线重合，所述气氛保护罩7上的氩气输入管8具有多个，多个氩气输入管8沿着气氛保护罩7径向相互间隔60°分布。Preferably, the inner mandrel 1 is a slender round rod, one end of the inner mandrel 1 is fixed on the drawing equipment, and the other end of the inner mandrel 1 is inserted into the inner mold cavity of the outer mold 3 for drawing, the The axis of the inner mold cavity of the drawing outer mold 3 coincides with the axis of the inner core mold 1, and there are multiple argon gas inlet pipes 8 on the atmosphere shield 7, and a plurality of argon gas inlet pipes 8 are arranged along the atmosphere shield. 7 are distributed radially at intervals of 60°.
具体实施例，在本实施例中选取以直径φ26mm，壁厚1mm的Mg-4Zn-0.8Y-0.4Nd镁合金管材作为加工管坯，利用控温拉拔工艺加工直径φ3.0mm，壁厚0.2mm的管材。Specific embodiments, in this embodiment, a Mg-4Zn-0.8Y-0.4Nd magnesium alloy pipe with a diameter of φ26mm and a wall thickness of 1mm is selected as the processing tube blank, and the temperature-controlled drawing process is used to process a diameter of φ3.0mm and a wall thickness of 0.2mm. mm tubing.
选取长度为600mm的φ26mm壁厚1mm的管材，利用感应加热线圈5将管材端头30mm长度快速加热至210℃，进行捻头加工，获得φ20mm的捻头区；将涂有高温润滑油的φ19mm内芯模1放入管材内腔，将装配好的镁合金管坯放入拉拔外型模3涂有高温润滑油脂的φ21mm内膜腔，并使内芯模1前端位于内膜腔内，捻头部位固定在拉拔头上，内芯模1末端固定在拉拔设备，并通过激光定位，使内芯模1轴线和拉拔外型模3内膜腔轴线相重合；设定感应加热温度为240℃，以20 L/min速率向气氛保护罩7内部通入氩气3分钟，开始加热，待温度稳定在240℃后开始拉拔，拉拔速率为200 mm/min；拉拔完毕后更换拉拔外型模3和内芯模1，重复以上的工序；当总变形量超过50%时，进行一次真空退火热处理。整体工艺如下：Select a φ26mm pipe with a wall thickness of 1mm and a length of 600mm, use the induction heating coil 5 to quickly heat the 30mm length of the pipe end to 210°C, and perform twisting processing to obtain a φ20mm twisting area; Put the core mold 1 into the inner cavity of the pipe, put the assembled magnesium alloy tube blank into the φ21mm inner membrane cavity of the drawing outer mold 3 coated with high-temperature lubricating grease, and make the front end of the inner core mold 1 be located in the inner membrane cavity, twist The head part is fixed on the drawing head, the end of the inner mandrel 1 is fixed on the drawing equipment, and positioned by laser, so that the axis of the inner mandrel 1 coincides with the axis of the inner membrane cavity of the drawn outer mold 3; set induction heating The temperature is 240°C, and argon gas is passed into the atmosphere shield 7 at a rate of 20 L/min for 3 minutes, and heating is started. After the temperature is stabilized at 240°C, the drawing is started, and the drawing rate is 200 mm/min; the drawing is completed Finally, replace the drawing outer mold 3 and the inner core mold 1, and repeat the above process; when the total deformation exceeds 50%, perform a vacuum annealing heat treatment. The overall process is as follows:
控温拉拔至φ21mm×1.0mm，再次拉拔至φ18mm×0.8mm，真空退火处理360℃/15分钟；Temperature-controlled drawing to φ21mm×1.0mm, drawing again to φ18mm×0.8mm, vacuum annealing at 360°C/15 minutes;
控温拉拔至φ14mm×0.8mm，再次拉拔至φ12mm×0.6mm，真空退火处理360℃/15分钟；Temperature-controlled drawing to φ14mm×0.8mm, drawing again to φ12mm×0.6mm, vacuum annealing at 360°C/15 minutes;
控温拉拔至φ8mm×0.6mm，再次拉拔至φ6mm×0.4mm，真空退火处理360℃/15分钟；Temperature-controlled drawing to φ8mm×0.6mm, drawing again to φ6mm×0.4mm, vacuum annealing at 360°C/15 minutes;
控温拉拔至φ5mm×0.6mm，再次拉拔至φ4mm×0.3mm，真空退火处理360℃/15分钟；Temperature controlled drawing to φ5mm×0.6mm, drawing again to φ4mm×0.3mm, vacuum annealing at 360°C/15 minutes;
控温拉拔至φ3mm×0.3mm，再次拉拔至φ3mm×0.2mm，真空退火处理360℃/15分钟。Temperature controlled drawing to φ3mm×0.3mm, drawing again to φ3mm×0.2mm, vacuum annealing at 360°C/15 minutes.
以上是对本实用新型的较佳实施进行了具体说明，但本实用新型创造并不限于所述实施例，熟悉本领域的技术人员在不违背本实用新型精神的前提下还可做出种种的等同变形或替换，这些等同的变形或替换均包含在本申请权利要求所限定的范围内。The above is a specific description of the preferred implementation of the present utility model, but the utility model creation is not limited to the described embodiments, and those skilled in the art can also make various equivalents without violating the spirit of the present utility model. Modifications or replacements, these equivalent modifications or replacements are all included within the scope defined by the claims of the present application.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820117928.1UCN207941814U (en) | 2018-01-23 | 2018-01-23 | A kind of magnesium alloy precision tube temperature control drawing mechanism |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820117928.1UCN207941814U (en) | 2018-01-23 | 2018-01-23 | A kind of magnesium alloy precision tube temperature control drawing mechanism |
| Publication Number | Publication Date |
|---|---|
| CN207941814Utrue CN207941814U (en) | 2018-10-09 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820117928.1UActiveCN207941814U (en) | 2018-01-23 | 2018-01-23 | A kind of magnesium alloy precision tube temperature control drawing mechanism |
| Country | Link |
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| CN (1) | CN207941814U (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108015113A (en)* | 2018-01-23 | 2018-05-11 | 北京大学深圳研究院 | A kind of magnesium alloy precision tube temperature control drawing process and its temperature control drawing mechanism |
| CN111229856A (en)* | 2019-12-31 | 2020-06-05 | 南京理工大学 | Continuous braiding and twisting drawing device and method for preparing heterogeneous magnesium alloy bars |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108015113A (en)* | 2018-01-23 | 2018-05-11 | 北京大学深圳研究院 | A kind of magnesium alloy precision tube temperature control drawing process and its temperature control drawing mechanism |
| CN111229856A (en)* | 2019-12-31 | 2020-06-05 | 南京理工大学 | Continuous braiding and twisting drawing device and method for preparing heterogeneous magnesium alloy bars |
| CN111229856B (en)* | 2019-12-31 | 2022-03-08 | 南京理工大学 | Continuous twisting and drawing device and method for preparing isomeric magnesium alloy bar |
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