阅读说明：本技术 一种固封极柱用下出线毛坯热挤压工艺 (Hot extrusion process of lower outgoing line blank for embedded pole ) 是由 杜舵 苟锁 李潇 刘向东 山瑛 陈浩军 孙君鹏 梁建斌 于 2020-03-02 设计创作，主要内容包括：本发明公开了一种固封极柱用下出线毛坯热挤压工艺,包括以下步骤：锯断下料,利用三维制图软件创建挤压毛坯3D模型,模拟测算毛坯重量,确定下料规格尺寸；坯料加热,根据挤压设备公称压力值,将锯切后的棒料利用电阻炉加热、保温处理；模具预热,将加热的坯料,放入成型模具内,对成型模具进行预热,用红外测温枪检测温度达到设定值时,将预热坯料取出；热压成型,将已加热保温好的坯料放入成型模中进行挤压成型；脱模,利用液压机顶杆机构进行脱模；本发明利用热挤压成型工艺制作下出线毛坯,缩短毛坯制作时间、提高毛坯质量、节约产品生产成本,适宜大量推广。(The invention discloses a hot extrusion process of a lower outgoing line blank for a solid-sealed polar pole, which comprises the following steps of: sawing and blanking, creating a 3D model of an extruded blank by using three-dimensional drawing software, measuring and calculating the weight of the blank in a simulated mode, and determining the specification and size of the blanking; heating the blank, namely heating and carrying out heat preservation treatment on the sawed bar stock by using a resistance furnace according to the nominal pressure value of the extrusion equipment; preheating a mould, namely putting the heated blank into a forming mould, preheating the forming mould, and taking out the preheated blank when the temperature detected by an infrared temperature measuring gun reaches a set value; hot press molding, namely putting the heated and heat-preserved blank into a forming die for extrusion molding; demolding, namely demolding by utilizing a hydraulic press ejector rod mechanism; the invention utilizes the hot extrusion molding process to manufacture the lower outgoing line blank, shortens the blank manufacturing time, improves the blank quality, saves the product production cost and is suitable for large-scale popularization.)

1. A lower outgoing line blank hot extrusion process for a solid-sealed pole is characterized by comprising the following steps:

s1: sawing off

The lower outlet wire material is T2, A3D model of the extruded blank is created by utilizing three-dimensional drawing software, the weight of the blank is calculated in a simulation mode to be AKg/piece, the consumption of the hot extruded material of the blank is considered, the actual feeding weight is A × 1.03.03 Kg/piece, and then the actual feeding weight is converted into a T2 bar stockSawing the material to L;

s2: heating of blanks

The sawed bars are put into an RX6-100-12 box type resistance furnace and are uniformly placed, the interval is more than or equal to 3cm, and no blank is placed in a 30cm door of the resistance furnace; closing the furnace door, heating to 780 +/-20 ℃, and then carrying out heat preservation treatment for 10-30 min;

s3: mold preheating

Before the blank is taken out of the furnace, putting the heated blank into a forming die, preheating the forming die, detecting by using an infrared temperature measuring gun, heating to 100-150 ℃, and then taking out the preheated blank;

s4: hot press forming

Performing blank extrusion by using YH-1000B type press machine equipment, putting a heated and heat-insulated blank into a female die (12), driving a male die (9) by downwards moving a middle beam (8) of a hydraulic press, smoothly centering the male die (9) and the female die (12) by a guide rod (6), continuously downwards moving the middle beam (8) of the hydraulic press, maintaining the pressure for 5-10 s after the male die (9) is pressed into the female die (12) for a certain distance, and then upwards moving the male die away from the female die (12); wherein, according to the nominal pressure value of YH-1000B type press machine equipment, the extrusion force of the hydraulic press is controlled to be 15-25 Mpa. The extrusion speed is 15-25 mm/s;

s5: demoulding

The ejector plate (4) is pushed upwards by the ejector rod (1) of the hydraulic press to eject the female die (12), then the female die (12) is divided into two parts, and the blank (11) is taken out to realize demoulding.

2. The hot extrusion process of the lower outgoing line blank for the embedded pole according to claim 1, wherein the specific operation mode in the step S3 is as follows: heating to 100-150 ℃ at a speed of 10-25 ℃/min in an inert gas atmosphere, keeping the constant temperature for 2-4 h for preheating, and taking out the preheated blank when the temperature reaches 100-150 ℃ by using an infrared temperature measuring gun.

3. The hot extrusion process of the lower outlet blank for the embedded pole according to claim 1, wherein in the step S4, before the blank is placed into the female die (12), the graphite lubricant is uniformly sprayed on the inner wall of the female die (12).

4. The hot extrusion process of the lower outgoing line blank for the embedded pole according to claim 1, wherein in the step S3, the forming die comprises a press machine working table (2), a die holder (3), a die sleeve (5), a female die (12), a hydraulic machine middle beam (8), a die frame (7), a die sleeve (10) and a male die (9); the die holder (3) is fixedly arranged on the upper end face of the working table top (2) of the press machine through a high-strength bolt, the lower end of the die holder (3) is provided with an ejector rod (1), the ejector rod (1) penetrates through the working table top (2) of the press machine, the die sleeve (5) is embedded and arranged inside the die holder (3), the female die (12) is sleeved inside the die sleeve (5), a material ejecting plate (4) is arranged between the female die (12) and the die sleeve (5), and a blank (11) is arranged inside the female die (12); the die holder (7) is fixedly arranged on the lower end face of a middle beam (8) of the hydraulic press through high-strength bolts, the die sleeve (10) is fixedly arranged on the lower end face of the die holder (7) through the high-strength bolts, the male die (9) is embedded and arranged inside the die sleeve (10), and the die holder (7) is connected with the die holder (2) in a sliding mode through the guide rod (6).

5. The hot extrusion process of the lower outlet blank for the embedded pole according to claim 4, wherein the female die (12) is designed in a half die structure and is provided with a forming die cavity, and the female die cavity is divided into two halves which are assembled and arranged in the female die sleeve (5).

6. The hot extrusion process of the lower outlet blank for the embedded pole according to claim 1, wherein in step S4, before the blank is placed into the female die sleeve (5), a graphite lubricant is uniformly sprayed on the inner wall of the female die (12).

Technical Field

The invention relates to the technical field of hot extrusion molding, in particular to a hot extrusion process of a lower outgoing line blank for a solid-sealed polar pole.

Background

The upper and lower wire outlet seats are important components of the solid-sealed pole vacuum circuit breaker, and along with modularization, integration and compact structure of the circuit breaker design, the product quality and technical requirements of the upper and lower wire outlet seats are continuously improved. The upper and lower wire outlet seats are pure copper special-shaped pieces, the shapes and the structures are irregular, blanks need to be manufactured in advance, then finished products are obtained through machining, and the quality and the lead time of the finished products are directly influenced by the time and the quality of the blanks prepared in the early stage.

At present, the lower outgoing line blank is manufactured by adopting the technical methods of die forging forming, casting technology, free forging and the like in the society, the die forging technology needs special die forging equipment, the structure of a die is complex, the investment cost of the die is high, and the die is suitable for batch production; the casting blank in the casting process is greatly influenced by the design of a casting system, a feeding system and an air outlet, and various defects such as insufficient casting, cold shut, slag inclusion, air holes and the like are easy to occur. The free forging is to control the shape and size of the forging by manual operation, so the precision of the forging is low, the machining allowance is large, the labor intensity is high, the productivity is not high, and the method is suitable for single-piece and small-batch production. Therefore, a blank manufacturing process with high manufacturing precision, short production period and reliable quality needs to be developed to meet the requirements of products and markets.

Disclosure of Invention

Aiming at the technical problems, the invention provides a method for manufacturing a lower outgoing line blank by utilizing a hot extrusion molding process and a molding die, aiming at the defects of the lower outgoing line blank manufactured by the prior art.

The technical scheme of the invention is as follows: a lower outlet blank hot extrusion process for a solid-sealed pole comprises the following steps:

s1: sawing off

The lower outlet wire material is T2, A3D model of the extruded blank is created by utilizing three-dimensional drawing software, the weight of the blank is calculated in a simulation mode to be AKg/piece, the consumption of the hot extruded material of the blank is considered, the actual feeding weight is A × 1.03.03 Kg/piece, and then the actual feeding weight is converted into a T2 bar stockSawing the material to L;

s2: heating of blanks

The sawed bars are put into an RX6-100-12 box type resistance furnace and are uniformly placed, the interval is more than or equal to 3cm, and no blank is placed in a 30cm door of the resistance furnace; closing the furnace door, heating to 780 +/-20 ℃, and then carrying out heat preservation treatment for 10-30 min; heating the blank uniformly;

s3: mold preheating

Before the blank is taken out of the furnace, putting the heated blank into a forming die, preheating the forming die, detecting by using an infrared temperature measuring gun, heating to 100-150 ℃, and then taking out the preheated blank; the defects of difficult blank forming, difficult film sticking, poor surface quality and the like caused by low temperature of the die are avoided; the problems that the mold is easily damaged due to too large temperature change of the mold and large cold and hot stress, and the mold is likely to be broken under severe conditions are also avoided;

s4: hot press forming

Performing blank extrusion by using a YH-1000B type press machine, putting a heated and heat-insulated blank into a female die, driving a male die by downwards moving a middle beam of a hydraulic press, smoothly centering the male die and the female die by a guide rod, continuously downwards moving a pressing plate of the hydraulic press, keeping the pressure for 5-10 s after the male die is pressed into the female die for a certain distance, and then upwards moving the male die away from the female die; wherein the extrusion force of the hydraulic press is controlled to be 15-25 Mpa; the extrusion speed is 15-25 mm/s;

s5: demoulding

And (3) utilizing a hydraulic press ejection structure to push the ejector rod upwards to push the ejector plate to eject the female die, dividing the female die into two parts, taking out the blank, and realizing demolding.

Further, the specific operation manner in step S3 is: in an inert gas atmosphere, heating to 100-150 ℃ at a speed of 10-25 ℃/min, keeping the constant temperature for 2-4 h for preheating, taking out the preheated blank when the temperature reaches 100-150 ℃ by using an infrared temperature measuring gun, and preheating the die more uniformly by a sectional heating mode.

Further, in step S3, the forming mold includes a press machine table, a female mold base, a female mold sleeve, a female mold, a hydraulic press middle beam, a male mold base, a male mold sleeve, and a male mold; the die holder is fixedly arranged on the upper end surface of the working table of the press machine through a high-strength bolt, the lower end of the die holder is provided with an ejector rod, the ejector rod penetrates through the working table of the press machine, a die sleeve is embedded in the die holder, the die sleeve is arranged in the die sleeve, and a material ejecting plate is arranged between the die and the die sleeve; the male die frame is fixedly arranged on the lower surface of a middle beam of the hydraulic machine through a high-strength bolt, the male die sleeve is fixedly arranged on the lower end face of the male die frame through the high-strength bolt, the male die is embedded in the male die sleeve, and the male die frame is connected with the female die base in a sliding mode through a guide rod.

Furthermore, the female die is designed in a half die structure and is provided with a forming die cavity, the female die is divided into two halves and assembled into the female die sleeve, and the split female die is arranged, so that the demoulding of the blank is facilitated, the demoulding time is greatly shortened, and the adhesion of the blank and the female die sleeve caused by too long demoulding time is avoided.

Further, in step S4, before the blank is placed in the female die, the graphite lubricant is uniformly sprayed on the inner wall of the female die, and the graphite lubricant is sprayed on the inner wall of the female die, so that the demolding of the extruded blank is facilitated, and the surface of the extruded blank is smooth and clean, which is beneficial to the processing of subsequent finished products.

The use method of the forming die comprises the following steps: when the blank ejection device is used, firstly, the mold is preheated, then the blank subjected to heating treatment is placed into the female mold, the hydraulic press is started, the press plate of the hydraulic press pushes the male mold frame, the male mold sleeve and the male mold to move together along the direction of the working table surface of the press machine so as to carry out hot extrusion on the blank, after the hot extrusion is finished, the ejector rod pushes the ejector plate to move upwards, the female mold is pushed out from the female mold sleeve, and the blank demolding is realized.

Compared with the prior art, the invention has the beneficial effects that: the invention has simple operation, small working labor intensity, high production precision and low production cost, and the die can be repeatedly disassembled and assembled for use, thereby saving the production cost of the die, shortening the processing period of the product and improving the one-time qualification rate and the production efficiency of the product; the lower outgoing line blank is manufactured by a hot extrusion molding process, so that the blank manufacturing time is shortened, the blank quality is improved, and the product production cost is saved; according to the design of the lower outgoing line hot-press forming die, the female die adopts a half die design structure, and blank demoulding is facilitated. The demolding time is greatly shortened, and the blank is prevented from being adhered to the cavity of the female die sleeve due to too long demolding time; according to the invention, through carrying out preheating treatment on the forming die, the defects of difficult blank forming, difficult film sticking, poor surface quality and the like caused by low die temperature are avoided; on the other hand, the problems that the mold is easily damaged due to too large temperature change and large cold and hot stress of the mold, and the mold is likely to be broken under severe conditions are also avoided.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a schematic structural view of a forming die of the present invention;

FIG. 3 is a schematic view of the raw material processing of the present invention;

wherein, the device comprises a push rod 1, a press machine 2, a working table surface 3, a die holder 4, a liftout 5, a die sleeve 6, a guide rod 7, a die frame 7, a middle beam of a hydraulic press 8, a male die 9, a die sleeve 10, a blank 11 and a female die 12.

Detailed Description