Multi-time deep drawing forming machining method for soft magnetic alloy micro-radius box-shaped part

Abstract

According to the multi-time drawing forming machining method for the soft magnetic alloy small-radius box-shaped part, based on the structural characteristics of the part, a plurality of sets of drawing dies and a set of correction die are designed, and a plate-shaped blank is machined into the small-radius box-shaped part in a multi-time drawing and correction combined machining mode; the soft magnetic alloy micro-radius box-shaped part is convenient to machine and form, the problems that the soft magnetic alloy micro-radius box-shaped part is complex in machining procedure and large in machining difficulty are solved, the size and appearance quality of products are guaranteed, the qualified rate of the products is effectively increased, the machining cost is reduced, and conditions are provided for continuously optimizing the machining technology of similar parts.

Description

Technical Field

[0001] The invention belongs to the technical field of soft magnetic alloy processing, and in particular relates to a multiple deep drawing and forming processing method for a soft magnetic alloy small-radius box-shaped part. Background Art

[0002] Soft magnetic alloys are a type of alloy with high magnetic permeability and low coercivity in weak magnetic fields. This type of alloy is widely used in radio electronics industry, precision instruments, remote control and automatic control systems. It is mainly used in energy conversion and information processing, and is an important material in the national economy.

[0003] Currently, if Figure 1 The soft magnetic alloy small radius box-shaped part shown is a box-shaped structure part with one end open and the other end closed. The wall is thin and has a certain depth. There are also small radius fillets at the four corners of the sealed end. The processing procedure is complicated and difficult, the processing efficiency is low and the cost is high. Therefore, in order to solve the above technical problems, it is necessary to design a soft magnetic alloy small radius box-shaped part multiple drawing forming mold and processing method. Summary of the invention

[0004] The technical problem solved by the present invention is as follows: a method for multiple deep drawing and forming of soft magnetic alloy small radius box-shaped parts is provided, which adopts a processing method combining multiple deep drawing and correction to facilitate the processing and forming of soft magnetic alloy small radius box-shaped parts, solves the problem of complex processing procedures and high processing difficulty of soft magnetic alloy small radius box-shaped parts, ensures the size and appearance quality of the product, effectively improves the product qualification rate, reduces the processing cost, and provides conditions for continuously optimizing the processing technology of similar parts.

[0005] The technical solution adopted by the present invention is a multiple deep drawing and forming method for a soft magnetic alloy small radius box-shaped part, which is characterized by comprising the following steps:

[0006] 1) According to the structural characteristics of the parts, calculate and determine the blank size and the drawing amount of the semi-finished parts under each process, and design multiple sets of drawing dies and one set of correction dies according to the drawing amount;

[0007] 2) Assemble the drawing die, install the drawing die in the drawing die on the bottom surface of the die handle, and make the lower end of the push rod fixedly connected to the middle of the push plate installed in the center die hole of the drawing die, and pass the lower end of the drawing punch through the center hole of the blank holder assembled on the lower die seat and fixedly connected to the lower die seat. When drawing for the first time, it is necessary to insert no less than three positioning pins on the circumference of the lower die seat, place the blank with lubricating oil on the upper and lower end surfaces on the blank holder of the drawing die, and position the blank by multiple positioning pins;

[0008] 3) Start the punch press, and when the drawing die moves downward with the punch slide, the drawing punch and the push plate cooperate to realize the drawing of the part in the center die hole of the drawing die;

[0009] 4) Replace the drawing die for the next drawing according to the drawing sequence, that is, replace the drawing die and punch in the drawing die corresponding to the previous process with the drawing die and punch in the drawing die corresponding to the previous process, apply die lubricant on the inner wall of the part that was drawn last time, install the part with the opening facing downward in the center die hole of the drawing die, and complete the installation of the corresponding drawing die, drawing punch and part;

[0010] 5) Repeat steps 3) to 4) to draw the part multiple times until the part is deep-drawn and formed;

[0011] 6) Remove the drawing die, fix the lower end of the correction punch on the outer pad on the lower die seat, and make the upper end of the correction punch pass through the center hole of the unloading plate and the mounting plate fixedly connected to the lower die seat and the outer pad, fix the correction die on the bottom surface of the die frame, and install the inner pad and the top plate in the center die hole of the correction die, so that the lower end of the ejector rod passes through the center hole of the inner pad and is fixedly connected to the center of the top plate, and completes the installation of the correction die;

[0012] 7) Install the finished part with its opening facing downward into the center die hole of the correction punch, start the punch press, and let the correction punch fit the inner cavity of the part as the die frame connected to the punch press slide moves downward until the correction die moves downward to contact the unloading plate;

[0013] 8) Flatten the end of the part to the required height as shown in the drawing.

[0014] In the above step 1), multiple sets of the drawing dies all include a drawing die and a drawing punch, the drawing die is adapted to be installed on the bottom surface of a die handle fixedly connected to the punch slide, and the lower end of the push rod arranged through the center hole of the die handle is fixedly connected to the middle part of the push plate arranged in the center hole of the drawing die, the lower end of the drawing punch passes through the center hole of the blank holder and is fixedly connected to the lower die seat, and the blank holder is installed on the lower die seat, and the drawing die cooperates with the drawing punch and the push plate as the punch slide moves downward to realize the drawing of the part in the center hole of the drawing die.

[0015] Furthermore, a plurality of positioning pins for positioning the blank are inserted on the circumference of the blank holder ring in the drawing die used for the first drawing.

[0016] Furthermore, a plurality of ejector rods are evenly distributed on the circumference of the lower die base, and a plurality of positioning holes on the bottom surface of the pressure ring are adapted to be connected with the corresponding upper ends of the ejector rods.

[0017] Furthermore, the cross-sectional shape of the drawing die in the last drawing die is a T-shaped structure with an upper diameter larger than a lower diameter, and the central die hole diameter of the drawing die is a forming die hole having the same outer diameter as the part forming diameter.

[0018] In the above step 1), the correction mold includes a correction die and a correction punch, the correction die is fixed on the bottom surface of the mold frame, the center die hole of the correction punch is a stepped hole with an upper hole diameter larger than the lower hole diameter, and the part is located in the small diameter section of the center die hole, a top plate adapted to the small diameter section of the center die hole of the correction punch is provided above the part, and the inner pad located at the upper end of the top plate is adapted to the large diameter section of the center die hole of the correction punch, the lower end of the push rod on the mold frame passes through the center hole of the inner pad and is fixedly connected to the center of the top plate, the lower end of the correction punch passes through the center holes of the unloading plate and the mounting plate and is fixedly connected to the outer pad, and the unloading plate, the mounting plate and the outer pad are fixedly connected to the lower mold base by a plurality of screws evenly distributed around the circumference.

[0019] The advantages of the present invention compared with the prior art are:

[0020] 1. Based on the structural characteristics of the parts, this technical solution designs multiple sets of drawing dies and one set of correction dies. The plate-shaped blank is processed into a small radius box-shaped part by combining multiple drawing and correction. This is convenient for the processing and forming of the soft magnetic alloy small radius box-shaped parts, and solves the problem of complex processing procedures and high processing difficulty of the soft magnetic alloy small radius box-shaped parts;

[0021] 2. This technical solution adopts multiple drawing processing methods based on different drawing dies, which is convenient for controlling different drawing speeds and forces in each drawing process. , thereby avoiding the phenomenon of tearing or wrinkling of the material during the drawing process and improving the drawing quality;

[0022] 3. This technical solution uses a correction die to correct the finished parts after multiple deep drawing of the parts, thereby improving the drawing accuracy and quality of the parts and the yield rate. It does not require manual measurement and correction one by one, thus improving the correction efficiency and accuracy.

[0023] 4. This technical solution has a simple structure, novel design, and convenient mold disassembly and assembly. It not only ensures the size and appearance quality of the product, but also effectively improves the product qualification rate, reduces processing costs, and provides conditions for continuously optimizing the processing technology of similar parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the assembly structure of the drawing die of the present invention;

[0025] Figure 2Schematic diagram of the drawing die and the drawing punch structure of the first set of drawing dies of the present invention, wherein a is a front view of the drawing die, c is a cross-sectional view with the horizontal midline of the drawing die upward, b is a front view of the drawing punch, and d is a bottom view of the drawing punch;

[0026] Figure 3 Schematic diagram of the drawing die and the drawing punch structure of the second set of drawing dies of the present invention, wherein a is a front view of the drawing die, c is a cross-sectional view with the horizontal midline of the drawing die upward, d is a front view of the drawing punch, and b is a top view of the drawing punch;

[0027] Figure 4 Schematic diagram of the drawing die and the drawing punch structure of the third set of drawing dies of the present invention, wherein c is a front view of the drawing die, a is a cross-sectional view of the horizontal center line of the drawing die downward, d is a front view of the drawing punch, and b is a top view of the drawing punch;

[0028] Figure 5 Schematic diagram of the correction die and correction punch structure of the correction die of the present invention, wherein c is the front view of the correction die, a is the top view of the drawing die, d is the front view of the drawing punch, and b is the top view of the drawing punch;

[0029] Figure 6 Schematic diagram of the correction mold assembly of the present invention DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention Figure 1-6 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that, in this document, unless otherwise stated, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc., are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In this document, the terms "comprises", "comprising" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further limitations. The elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0033] Multiple deep drawing processing method for soft magnetic alloy small radius box-shaped parts, such as Figure 1-6 As shown, the following steps are included:

[0034] 1) According to the structural characteristics of the part 8, the blank size and the drawing amount of the semi-finished part (8) in each process are calculated and determined, and a plurality of drawing dies and a set of correction dies are designed according to the drawing amount;

[0035] like Figure 1-4 As shown, multiple sets of the drawing dies include a drawing die 1 and a drawing punch 2. The drawing die 1 is adapted to be installed on the bottom surface of a die handle 9 fixedly connected to the punch slide, and the lower end of a push rod 10 arranged through the center hole of the die handle 9 is fixedly connected to the middle of a push plate 7 arranged in the center die hole of the drawing die 1. The lower end of the drawing punch 2 passes through the center hole of the blank holder 3 and is fixedly connected to the lower die seat 6, and the blank holder 3 is installed on the lower die seat 6. The drawing die 1 cooperates with the drawing punch 2 and the push plate 7 during the downward movement of the punch slide to realize the part 8 in the drawing die. 1 is a drawing method for a drawing die having a central die hole; specifically, a plurality of positioning pins 4 for positioning the blank are inserted on the upper circumference of the blank holder 3 in the drawing die for the first drawing; specifically, a plurality of ejector pins 5 are evenly distributed on the upper circumference of the lower die seat 6, and a plurality of positioning holes on the bottom surface of the blank holder 3 are matched and connected with the upper ends of the corresponding ejector pins 5; specifically, a cross-sectional shape of the drawing die 1 in the drawing die for the last drawing is a T-shaped structure with a larger diameter at the upper end than at the lower end, and the diameter of the central die hole of the drawing die 1 is a forming die hole with the same forming outer diameter as the part 8.

[0036] The correction mold includes a correction die 11 and a correction punch 12, the correction die 11 is fixed on the bottom surface of the mold frame, the central mold hole of the correction punch 12 is a stepped hole with an upper end diameter larger than a lower end diameter, and the part 8 is located at the small diameter section of the central mold hole, a top plate 14 adapted to the small diameter section of the central mold hole of the correction punch 12 is provided above the part 8, and an inner pad 15 located at the upper end of the top plate 14 is adapted to the large diameter section of the central mold hole of the correction punch 12, the lower end of the push rod 10 on the mold frame passes through the center hole on the inner pad 15 and is fixedly connected to the center of the top plate 14, the lower end of the correction punch 12 passes through the center holes on the stripper plate 16 and the mounting plate 17 and is fixedly connected to the outer pad 13, and the stripper plate 16, the mounting plate 17 and the outer pad 13 are fixedly connected to the lower mold base 6 by a plurality of screws 18 evenly distributed around the circumference;

[0037] 2) Assemble the drawing die, install the drawing die 1 in the drawing die for drawing on the bottom surface of the die handle 9, and make the lower end of the push rod 10 fixedly connected to the middle of the push plate 7 installed in the central die hole of the drawing die 1, and pass the lower end of the drawing punch 2 through the central hole of the blank holder 3 installed on the lower die seat 6 and fixedly connected to the lower die seat 6. When drawing for the first time, it is necessary to insert no less than three positioning pins 4 on the circumference of the lower die seat 6, place the blank with lubricating oil on the upper and lower end surfaces on the blank holder 3 of the drawing die, and position the blank by multiple positioning pins 4;

[0038] 3) Start the punch press, and when the drawing die 1 moves downward with the punch slide, the drawing punch 2 and the push plate 7 cooperate to realize the drawing of the part 8 in the center die hole of the drawing die 1;

[0039] 4) Replace the drawing die for the next drawing according to the drawing sequence, that is, replace the drawing die 1 and the drawing punch 2 in the drawing die corresponding to the previous process with the drawing die 1 and the drawing punch 2 in the drawing die corresponding to the previous process, apply die lubricant on the inner wall of the last drawn part 8, install the part 8 with the opening facing downward in the center die hole of the drawing die 1, and complete the installation of the corresponding drawing die 1, the drawing punch 2 and the part 8;

[0040] 5) Repeat steps 3) to 4) to draw the part 8 several times until the part 8 is deep-drawn and formed; multiple deep-drawing processing methods are used on the basis of different deep-drawing dies to facilitate the control of different deep-drawing speeds and forces in each deep-drawing process. , thereby avoiding the phenomenon of tearing or wrinkling of the material during the deep-drawing process and improving the deep-drawing quality;

[0041] 6) Remove the drawing die, such as Figure 5-6As shown, the lower end of the correction punch 12 is fixed to the outer pad 13 on the lower die base 6, and the upper end of the correction punch 12 passes through the center holes of the stripper plate 16 and the mounting plate 17 fixedly connected to the lower die base 6 and the outer pad 13, the correction die 11 is fixed to the bottom surface of the die frame, and the inner pad 15 and the top plate 14 are installed in the center die hole of the correction die 11, and the lower end of the ejector 10 passes through the center hole on the inner pad 15 and is fixedly connected to the center of the top plate 14, and the installation of the correction mold is completed;

[0042] 7) Install the part 8 after deep drawing with its opening facing downward into the central die hole of the correction punch 12, start the punch press, and make the correction punch 12 fit with the inner cavity of the part 8 as the die frame connected to the punch press slide moves downward, until the correction die 11 moves downward to contact the unloading plate 16; after the part 8 is deep drawn for many times, the correction die is used to correct the finished part 8, so as to improve the drawing accuracy and quality of the part 8 and the yield rate, and there is no need to measure and correct each one manually, so as to improve the correction efficiency and correction accuracy;

[0043] 8) Flatten the end of part 8 to the required height as shown in the drawing.

[0044] Specifically, three sets of drawing dies are used to draw the blank three times to form a finished part 8 with a height of 18.6 mm. The specific drawing dimensions are as follows: when the finished part 8 is 18.6 mm high, when the first set of drawing dies is used for drawing, the height dimension after the first drawing is about 13 mm, when the second set of drawing dies is used for drawing, the height dimension after the second drawing is about 17.4 mm, when the third set of drawing dies is used for drawing, the height dimension after the third drawing is greater than 19 mm, which is corrected to 19 mm, and then the end of the part 8 is flattened to 18.6 mm.

[0045] The above processing technology has the following advantages: ① The surface quality of part 8 is good. During the drawing process, the surface of the material is not damaged, and the appearance of part 8 is beautiful, which provides good conditions for subsequent surface treatment (painting); ② The dimensional accuracy of part 8 is high: the part 8 has high dimensional accuracy, uniform size, good interchangeability, and does not require further mechanical processing to meet general assembly and use requirements; ③ High material utilization rate: part 8 is manufactured under the premise of not much material consumption, with light weight and good rigidity; in addition, after the material undergoes plastic deformation, the internal structure of the metal is optimized, which improves the strength of the drawn part; ④ High productivity: through reasonable process control, such as selecting suitable materials, controlling room temperature, and drawing speed, high-quality drawn parts with stable quality can be produced.

[0046] Based on the structural characteristics of part 8, our technical solution has designed multiple sets of drawing dies and a set of correction dies, and adopted a processing method combining multiple drawing and correction to process the plate-like blank into a small-radius box-shaped part 8, which is convenient for the processing and forming of soft magnetic alloy small-radius box-shaped parts, and solves the problem of complex processing procedures and high processing difficulty of soft magnetic alloy small-radius box-shaped parts 8. It has a simple structure, novel design, and easy disassembly and assembly of the mold, which not only ensures the size and appearance quality of the product, but also effectively improves the product qualification rate and reduces processing costs, providing conditions for continuously optimizing the processing technology of similar parts.

[0047] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A multiple deep drawing method for a soft magnetic alloy small radius box-shaped part, characterized in that The following steps are involved: 1) according to the structural characteristics of the part (8), the blank size and the drawing amount of the semi-finished part (8) in each process are calculated and determined, and according to the drawing amount, a plurality of drawing dies and a correction die are designed; 2) Assembling the drawing die, installing the drawing die (1) in the drawing die on the bottom surface of the die handle (9), and making the lower end of the push rod (10) fixedly connected to the middle of the push plate (7) installed in the center die hole of the drawing die (1), passing the lower end of the drawing punch (2) through the center hole of the pressure ring (3) installed on the lower die seat (6) and fixedly connected to the lower die seat (6), when drawing for the first time, it is necessary to insert no less than three positioning pins (4) on the circumference of the lower die seat (6), place the blank with lubricating oil applied on the upper and lower end surfaces on the pressure ring (3) of the drawing die, and position the blank by multiple positioning pins (4); 3) starting the punch press, and when the drawing die (1) moves downward along with the punch press slide, the drawing punch (2) and the push plate (7) cooperate to achieve drawing of the part (8) in the center die hole of the drawing die (1); 4) replacing the drawing die for the next drawing according to the drawing sequence, that is, replacing the drawing die (1) and the drawing punch (2) in the drawing die corresponding to the previous process with the drawing die (1) and the drawing punch (2) in the drawing die corresponding to the previous process, applying die lubricant on the inner wall of the part (8) that was drawn last time, installing the part (8) with its opening facing downward into the central die hole of the drawing die (1), and completing the installation of the corresponding drawing die (1), the drawing punch (2) and the part (8); 5) Repeating steps 3) to 4), the part (8) is drawn multiple times until the part (8) is deep-drawn and formed; 6) Remove the drawing die, fix the lower end of the correction punch (12) on the outer pad (13) on the lower die base (6), and make the upper end of the correction punch (12) pass through the center hole of the unloading plate (16) and the mounting plate (17) fixedly connected to the lower die base (6) and the outer pad (13), fix the correction die (11) on the bottom surface of the die frame, and install the inner pad (15) and the top plate (14) in the center die hole of the correction die (11), make the lower end of the push rod (10) pass through the center hole on the inner pad (15) and be fixedly connected to the center of the top plate (14), and complete the installation of the correction die; 7) The drawn part (8) is installed with its opening facing downward into the central die hole of the correction punch (12), and the punch press is started. The correction punch (12) is adapted to the inner cavity of the part (8) as the die frame connected to the punch press slide moves downward, until the correction die (11) moves downward to contact the stripper plate (16); 8) Flatten the end of part (8) to the required height as shown in the drawing.

2. The method for multiple deep drawing of soft magnetic alloy small radius box-shaped parts according to claim 1, characterized in that: In the above step 1), the plurality of sets of the drawing dies all include a drawing die (1) and a drawing punch (2), the drawing die (1) being adapted to be installed on the bottom surface of a die handle (9) fixedly connected to the punch slide, and the lower end of a push rod (10) arranged through the center hole of the die handle (9) is fixedly connected to the middle of a push plate (7) arranged in the center hole of the drawing die (1), the lower end of the drawing punch (2) passes through the center hole of the pressure ring (3) and is fixedly connected to the lower die seat (6), and the pressure ring (3) is installed on the lower die seat (6), and the drawing die (1) cooperates with the drawing punch (2) and the push plate (7) as the punch slide moves downward to realize the drawing of the part (8) in the center hole of the drawing die (1).

3. The method for multiple deep drawing of soft magnetic alloy small radius box-shaped parts according to claim 2, characterized in that: A plurality of positioning pins (4) for positioning the blank are inserted on the circumference of the blank holding ring (3) in the drawing die used for the first drawing.

4. The method for multiple deep drawing of soft magnetic alloy small radius box-shaped parts according to claim 3, characterized in that: A plurality of push rods (5) are evenly distributed on the circumference of the lower die seat (6), and a plurality of positioning holes on the bottom surface of the pressure ring (3) are adapted to be connected with the upper ends of the corresponding push rods (5).

5. The method for multiple deep drawing of a soft magnetic alloy small radius box-shaped part according to claim 4, characterized in that: The cross-sectional shape of the drawing die (1) in the last drawing die is a T-shaped structure with a diameter at the upper end larger than a diameter at the lower end, and the diameter of the central die hole of the drawing die (1) is the same as the outer diameter of the part (8).

6. The method for multiple deep drawing of a soft magnetic alloy small radius box-shaped part according to any one of claims 1 to 5, characterized in that: In the above step 1), the correction mold comprises a correction die (11) and a correction punch (12), the correction die (11) is fixed on the bottom surface of the mold frame, the central die hole of the correction punch (12) is a stepped hole with an upper hole diameter larger than a lower hole diameter, and the part (8) is located in the small diameter section of the central die hole, and a top plate (14) adapted to the small diameter section of the central die hole of the correction punch (12) is provided above the part (8), and an inner pad (15) is located at the upper end of the top plate (14) Adapted to the large diameter section of the center die hole of the correction punch (12), the lower end of the push rod (10) on the die frame passes through the center hole on the inner pad (15) and is fixedly connected to the center of the top plate (14), the lower end of the correction punch (12) passes through the center holes on the stripper plate (16) and the mounting plate (17) and is fixedly connected to the outer pad (13), and the stripper plate (16), the mounting plate (17) and the outer pad (13) are fixedly connected to the lower die base (6) by a plurality of screws (18) evenly distributed around the circumference.

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