Die for simultaneously forming revolving body blank with concave bottom and outer top surface

Abstract

The invention belongs to the technical field of hot extrusion forming, and discloses a die for simultaneously forming a revolved body blank with a concave bottom and an outer top surface, which comprises a pressure head (1), a pressure cover (2), an outer top surface forming die (3), a material returning ring (4), a concave bottom forming punch (5), a first die cushion (6), a material returning ejector rod (7), a second die cushion (8), a third die cushion (9), a material returning rod seat (10) and a cooling water jacket (11). The shape of the top of the bottom concave forming punch (5) is matched with the inner concave surface of a blank, a base extending in the radial direction is arranged at the bottom of the bottom concave forming punch (5), a vertical through hole is formed in the base, the first die cushion (6) is arranged on the outer side of the base of the bottom concave forming punch (5) in a sleeving mode, and the first die cushion (6) and the base are in transition fit; and the outer tip surface forming die (3) is arranged above the die cushion I (6). The production efficiency of extrusion blanks can be improved, and the die is easy to disassemble and assemble.

Description

Technical Field

[0001] The invention belongs to the technical field of hot extrusion forming, and in particular relates to a die for simultaneously forming a rotating body blank with a bottom concave and an outer surface. Background Art

[0002] The bottom structure of a product is as follows Figure 1 As shown in FIG. 1 , its shape includes the bottom concave 0-2 of the inner surface and the outer surface 0-1 of the outer surface. The material is super-hard aluminum alloy 7A04. In order to manufacture a near-net-shape blank, improve material utilization, and simplify the turning process, the blank is currently manufactured by a two-step forming method of using a 500T hydraulic press to form the bottom concave and then transferring it to a 315T hydraulic press to form the outer surface. Two sets of molds are used in the production process, one set of bottom concave forming molds (such as Figure 2 ), a set of outer surface forming molds (such as Figure 3 ), the mold is a traditional rotary hot extrusion blank mold structure consisting of a male mold and a female mold, and the female mold has a direct ejection and withdrawal structure. This results in low production efficiency, high labor intensity, high energy consumption, and increased production costs.

[0003] The quality of hot extrusion blanks is guaranteed by the mold. The rationality of the mold structure directly affects the effect of blank forming. While ensuring the quality, it must also be easy to disassemble and assemble to reduce the labor intensity of the operator. Summary of the invention

[0004] The technical problem to be solved by the present invention is: the production efficiency of two-time forming is low and the labor intensity is high.

[0005] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0006] A die for simultaneously forming a rotary body blank with a bottom concave and an outer surface, comprising a pressing head 1, a pressure cover 2, an outer surface forming die 3, a material stripping ring 4, a bottom concave forming punch 5, a die pad 1 6, a material stripping ejector 7, a die pad 2 8, a die pad 3 9, a material stripping rod seat 10, and a cooling water jacket 11;

[0007] The top shape of the bottom concave forming punch 5 matches the inner concave surface of the blank, and a radially extending base is provided at the bottom thereof, and a vertical through hole is provided on the base. The die pad 6 is sleeved on the outer side of the base of the bottom concave forming punch 5, and the two are transitionally matched; the outer surface forming die 3 is provided above the die pad 6;

[0008] The base of the bottom concave forming punch 5 is arranged above the die pad 2 8, and the pressure head 1 passes through the pressure cover 2 and is arranged directly above the bottom concave forming punch 5; the stripping ring 4 is sleeved on the outside of the bottom concave forming punch 5;

[0009] The material return rod seat 10 is arranged below the die pad 2 8; the bottom of the material return push rod 7 is fixedly connected to the material return rod seat 10, and the top passes through the die pad 2 8 and the through hole of the base of the bottom concave forming punch 5 in turn to contact the bottom of the material return ring 4; the die pad 3 9 is sleeved on the outside of the material return rod seat 10, and the cooling water jacket 11 is sleeved on the outside of the outer slightly forming mold 3, die pad 1, die pad 2, and die pad 3.

[0010] Wherein, the working part of the pressure head is set to a 1° slight surface.

[0011] Wherein, three exhaust holes are arranged on the working surface of the pressure head.

[0012] Among them, the outer surface forming mold has the same outer taper as mold pad one, mold pad two, and mold pad three, and is matched with the inner taper surface of the cooling water jacket.

[0013] Among them, the stripping ring and the bottom concave forming punch are clearance-matched.

[0014] Among them, an annular overflow groove is arranged on the contact surface between the top of the material stripping ring and the blank; and six exhaust grooves are arranged on the side wall and the bottom end surface of the material stripping ring respectively.

[0015] Among them, the mold pad 2 is provided with 6 exhaust holes.

[0016] Among them, the inner surface of the cooling water jacket is a slightly flat structure with a larger top end and a smaller bottom end.

[0017] Among them, the bottom concave forming punch and the stripping ring are made of hot working die steel 4Cr5MoSiV1.

[0018] The present invention has the following advantages:

[0019] 1. Improve the production efficiency of extruded blanks: the original two-step forming method of 500T hydraulic press for bottom concave forming and 315T hydraulic press for outer surface forming is changed to one-step extrusion to form bottom concave + outer surface at the same time to form a near-net-shape blank, which more than doubles the production efficiency and reduces the labor intensity and energy consumption of operators;

[0020] 2. The mold is easy to disassemble: The original design of the cooling water jacket adopts a structure with a small top and a large bottom. When disassembling the mold, the entire mold base must be disassembled before the mold can be replaced. The cooling water jacket with a large top and a small bottom structure solves the problem of disassembling the mold. When disassembling the mold, you only need to remove the top gland and use the hydraulic press to push out the matching lifting hole. There is no need to disassemble the mold base, which reduces the time for disassembling the mold and facilitates the installation operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the bottom structure of a product;

[0022] Figure 2 It is a schematic diagram of the bottom concave forming die;

[0023] Figure 3 It is a schematic diagram of the outer surface forming die;

[0024] Figure 4 It is a schematic diagram of the mold design for simultaneously forming the bottom concave and outer surface of the rotating body blank;

[0025] Figure 5 is a schematic diagram of the pressure head;

[0026] Figure 6 It is a schematic diagram of the material withdrawal ring;

[0027] Figure 7 for Figure 6 AA view;

[0028] Figure 8 It is a schematic diagram of a bottom concave forming punch;

[0029] Fig. 9 for Figure 8 AA view;

[0030] Fig.10 This is a schematic diagram of mold pad 2;

[0031] Fig.11 for Fig.10 AA view;

[0032] Explanation of the markings in the figure: 1. Press head; 2. Press cover; 3. External surface forming die; 4. Material removal ring; 5. Bottom concave forming punch; 6. Die pad one; 7. Material removal ejector pin; 8. Die pad two; 9. Die pad three; 10. Material removal rod seat; 11. Cooling water jacket; 4-1. Annular overflow groove; 4-2. Exhaust groove; 8-1. Exhaust hole; 8-2. Through hole for matching between die pad two and material removal ejector pin. DETAILED DESCRIPTION

[0033] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] Take the manufacturing of a bullet base blank as an example.

[0035] A mold for simultaneously forming a rotating body blank with a bottom concave and an outer surface (such as Figure 4 ), the specific design process is as follows:

[0036] 1. According to the blank structure, the pressure head (such as Figure 5 ) The working part adopts a 1° surface to prevent the blank and the pressing head from locking; 3 exhaust holes to prevent holding air, affecting the metal flow and causing incomplete metal filling;

[0037] 2. The outer taper of the outer surface forming die is the same as that of die pad 1, die pad 2 and die pad 3, and is matched with the inner taper of the cooling water jacket to ensure its coaxiality;

[0038] 3. The bottom concave forming punch base and the die pad are combined in a transitional manner to ensure that the bottom concave forming punch is in the center of the outer slightly forming die, so as to better ensure the uniform wall thickness (inner and outer diameters are coaxial) of the extruded blank.

[0039] 4. The clearance between the stripping ring and the bottom concave forming punch is matched. The material of the bottom concave forming punch is selected with a small thermal expansion coefficient. During the hot working process, the thermal deformation of the bottom concave forming punch is small, ensuring that the stripping ring can move freely up and down, ensuring normal stripping;

[0040] 5. Material withdrawal ring (such as Figure 6 , Figure 7 ) An annular overflow groove is designed on the contact surface with the blank to ensure the excess blank metal flows out and prevent the blank from sticking to the bottom concave forming punch; six exhaust grooves are designed on the side wall and bottom end surface of the material withdrawal ring to prevent holding air and causing incomplete metal filling;

[0041] 6. Bottom concave forming punch base (such as Figure 8 , Fig. 9 ) and mold pad 2 (such as Fig.10 , Fig.11 ) Each of the 6 through holes is matched with the clearance of the ejector pin, and the clearance between the through hole diameter of the bottom concave forming punch base and the ejector pin is small, ensuring that the ejector pin is perpendicular to the ejector pin seat and can move freely during material removal; the clearance between the through hole diameter of the die pad 2 and the ejector pin is large, which is convenient for mold installation, and 6 exhaust through holes are designed in the die pad 2;

[0042] 7. Cooling water jacket (such as Figure 4 ) The inner surface adopts a small surface structure with a large top and a small bottom, which is easy to disassemble and assemble the mold. When disassembling the mold, you only need to remove the top cover of the mold base to disassemble and assemble the mold, without disassembling the mold base, which can reduce the mold disassembly and assembly time and reduce the labor intensity of the operator.

[0043] The key points of the mold design for simultaneously forming a rotating body blank with a bottom concave and an outer surface are as follows:

[0044] 1. The outer taper angles of the outer taper forming mold, die pad 1, die pad 2 and die pad 3 are consistent with the inner taper angle of the cooling water jacket to ensure that their center lines are coaxial;

[0045] 2. The material of the bottom concave forming punch and the stripping ring is made of hot working die steel 4Cr5MoSiV1, so that their thermal expansion coefficients are the same. During the hot working process, the thermal deformation of the bottom concave forming punch is reduced, ensuring that the stripping ring can move freely up and down, ensuring normal stripping;

[0046] 3. An annular overflow groove is designed on the contact surface between the stripping ring and the blank to ensure the excess blank metal flows out and prevent the blank from sticking to the bottom concave forming punch; six exhaust grooves are designed on the side wall and bottom end surface of the stripping ring to prevent holding air and causing incomplete metal filling;

[0047] 4. The bottom concave forming punch base and the die pad 2 each have 6 through holes processed to match the clearance between the ejector pin. The diameter of the through hole of the bottom concave forming punch base and the clearance between the ejector pin are small, ensuring that the ejector pin is perpendicular to the ejector pin seat and the ejector can move freely. The diameter of the through hole of the die pad 2 and the clearance between the ejector pin are large, which is convenient for mold installation, and 6 exhaust holes are designed in the die pad 2 to ensure the free movement of the transmission ejector structure.

[0048] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, it is apparent to those skilled in the art that several modifications and improvements may be made without departing from the principles of the present invention, and these modifications and improvements should also be considered to fall within the scope of protection of the present invention.

Claims

1. A mold for simultaneously forming a rotating body blank with a bottom concave and an outer surface, characterized in that: It comprises a pressing head (1), a pressing cover (2), an outer surface forming die (3), a material stripping ring (4), a bottom concave forming punch (5), a die pad 1 (6), a material stripping ejector rod (7), a die pad 2 (8), a die pad 3 (9), a material stripping rod seat (10), and a cooling water jacket (11); The top shape of the bottom concave forming punch (5) matches the inner concave surface of the blank, and a radially extending base is arranged at the bottom thereof, and a vertical through hole is arranged on the base. A die pad (6) is sleeved on the outer side of the base of the bottom concave forming punch (5), and the two are transitionally matched; the outer surface forming die (3) is arranged above the die pad (6); The base of the bottom concave forming punch (5) is arranged above the second die pad (8); the pressure head (1) passes through the pressure cover (2) and is arranged directly above the bottom concave forming punch (5); the stripping ring (4) is sleeved on the outer side of the bottom concave forming punch (5); The material-removing rod seat (10) is arranged below the second die pad (8); the bottom of the material-removing ejector rod (7) is fixedly connected to the material-removing rod seat (10), and the top thereof passes through the second die pad (8) and the through hole of the base of the bottom concave forming punch (5) in sequence to contact the bottom of the material-removing ring (4); the third die pad (9) is sleeved on the outside of the material-removing rod seat (10), and the cooling water jacket (11) is sleeved on the outside of the outer slightly-surface forming die (3), the first die pad, the second die pad, and the third die pad.

2. The mold for simultaneously forming a rotating body blank with a bottom concave and an outer surface according to claim 1 is characterized in that: The working part of the pressure head is set to a 1° slight angle.

3. The mold for simultaneously forming a rotating body blank with a bottom concave and an outer surface according to claim 2 is characterized in that: Three exhaust holes are arranged on the working surface of the pressure head.

4. The mold for simultaneously forming a rotating body blank with a bottom concave and an outer surface according to claim 1 is characterized in that: The outer surface forming die has the same outer taper as die pad 1, die pad 2 and die pad 3, and is matched with the inner taper surface of the cooling water jacket.

5. The mold for simultaneously forming a rotating body blank with a bottom concave and an outer surface according to claim 1 is characterized in that: The stripping ring and the bottom concave forming punch have clearance fit.

6. The mold for simultaneously forming a rotating body blank with a bottom concave and an outer surface according to claim 1 is characterized in that: The contact surface between the top of the stripping ring and the blank is provided with an annular overflow groove; the side wall and the bottom end surface of the stripping ring are respectively provided with six exhaust grooves.

7. The mold for simultaneously forming a rotating body blank with a bottom concave and an outer surface according to claim 1 is characterized in that: The mold pad 2 is provided with 6 exhaust holes.

8. The mold for simultaneously forming a rotating body blank with a bottom concave and an outer surface according to claim 1 is characterized in that: The inner surface of the cooling water jacket is a slightly flat structure with a larger top end and a smaller bottom end.

9. The mold for simultaneously forming a rotating body blank with a bottom concave and an outer surface according to claim 1, characterized in that: The bottom concave forming punch and stripper ring are made of hot working die steel 4Cr5MoSiV1.

Images