CN111774514A - Valve body forging die - Google Patents

Abstract

The invention relates to a valve body forging die, comprising a left die, a right die and an upper die. Concave structures are respectively formed on the opposite side walls of the left die and the right die, and the concave structures of the left die and the right die are butted to form a valve body. A cavity with the same shape of the forging, an opening is formed at the upper end of the cavity, and the upper die is located directly above the opening; it is characterized in that the lower end surfaces of the left die and the right die are movably placed in the positioning groove on the upper plane of the bottom plate, and the left side of the left die passes through the left side. The die pad is connected with the left machine pressing slide, the right side of the right die is connected with the right machine pressing slide through the right die pad, and the upper end of the upper die is connected with the upper machine pressing slide through the upper die pad. When the mold is ejected, the mold can be opened vertically and left and right at the same time, the mold opening speed is fast, the production efficiency is high, and it can meet the mold opening requirements of flanged valve body and special-shaped valve body forgings, and has a wide range of applications; moreover, in the forging process , The left die and the right die have very low horizontal pressure on the left die pad and the right die pad, the wear is small, the equipment cost is low, and the service life is long.

Description

Valve body forging die

technical field

The invention belongs to the field of molds, and in particular relates to a valve body forging mold.

Background technique

Valve body forgings are widely used in high pressure valves due to their high density. At present, the valve body forging process generally adopts a combination of free forging and die forging. The preform that has undergone free forging is put into the upper die and the lower die to be pressed, and the forging is completed. The forged product is a solid forging. Large burrs require machining of inner holes and cutting burrs, which are cumbersome and waste a lot of raw materials. In order to solve the above problems, the valve body forging die with patent number CN201610571523.0 is composed of a lower die part composed of a punch, a left and right die, and an outer die sleeve serving as a positioning part of the left and right die. Concave structure, the inner concave structure of the left and right dies is connected to form a cavity consistent with the shape of the valve body to be forged, the upper end of the cavity forms an opening, the positioning piece maintains the stable splicing state of the left and right dies, and the punch can extend into the lower model along the opening of the lower mold cavity. In the cavity, the product can not only retain a relatively complete forging flow line, improve the mechanical properties of the parts, but also save raw materials and reduce production costs. The main disadvantage is: the mold is locked by the annular outer mold sleeve, the left and right molds are separated by ejecting the core mold during the production process, the ejection stroke is long, the mold opening distance is small, the operation process is very troublesome, and the production time of a single piece takes 5 minutes. The production efficiency is low if it exceeds one piece per piece; during the forging process, the vertical forging pressure is very large. Since the angle of the contact surface between the left and right dies and the outer die sleeve is very small, through the decomposition of the force, the outer slope of the left and right dies and the horizontal direction of the outer die sleeve The force is very large, the wall thickness of the outer mold sleeve needs to be very thick to meet the strength requirements and fatigue life requirements, the cost of the mold is very high, and the contact surface is easily worn or even damaged in the mold opening project of the anti-composite mold, which makes the forging accuracy of the mold. The lower end of the two lower mold parts need to be hingedly connected together to maintain the symmetry of the left and right mold cavities. When the product is out of the mold, the two lower mold parts are rotated and opened to both sides with the hinge as a fulcrum. Taking out the forgings, it is not possible to open the die for the valve body forgings with flanges, and it is only suitable for the valve body forgings without flanges, and the use is limited.

SUMMARY OF THE INVENTION

Aiming at the shortcomings of the prior art, the invention provides a valve body forging die with low cost, high production efficiency, high forging precision, long service life and wide application range.

The technical scheme of the present invention includes a left die, a right die and an upper die. Concave structures are respectively formed on the opposite side walls of the left die and the right die, and the concave structures of the left die and the right die are connected to form a shape consistent with the valve body forging. The upper end of the cavity forms an opening, and the upper die is located directly above the opening; it is characterized in that the lower end surfaces of the left die and the right die are movably placed in the positioning grooves on the upper plane of the bottom plate, and the left side of the left die passes through the left die pad and the left die. The machine pressing slide is connected, the right side of the right die is connected with the right machine pressing slide through the right die pad, and the upper end of the upper die is connected with the upper machine pressing slide through the upper die pad.

Preferably, the overall shape of the left die and the right die after the butt joint is a cylinder, the opposite surface of the left die pad and the right die pad is a semi-cylindrical concave surface, and the outer cylindrical surface of the cylinder is equal to the outer cylindrical surface after the two are butted. diameter of cylindrical holes.

Preferably, the overall shape of the left mold and the right mold after the butt joint is square, the center of the left plane of the left mold is formed with a protruding positioning plane and the limit concave hole at the corresponding position of the left mold backing plate cooperates with each other, and the right plane of the right mold is formed. A protruding positioning plane in the center cooperates with the limiting concave holes at the corresponding positions of the right die pad.

Preferably, a protruding positioning cylindrical ring is formed in the middle of the outer circular surface of the cylinder, and the semi-cylindrical concave surfaces of the left die pad and the right die pad are respectively made with the positioning cylindrical ring. Semi-cylindrical positioning groove.

Preferably, the bottom plate is composed of a lower molding plate fixedly installed in the plane of the lower molding plate, the lower mold is fixedly installed at the center of the lower molding plate, and the center of the lower end face of the left mold and the right mold has a lower opening that communicates with its internal cavity, and the lower mold is The upper end extends into the cavity from the lower opening.

Compared with the prior art, the beneficial effects of the present invention are: the left die and the right die are pressed and positioned on the bottom plate by the press machine through the left die pad and the right die pad, and the left die pad and the left die and the right die pad are pressed and positioned on the bottom plate. The die and the right die can be moved to the left and right respectively. When the die is released, the die can be opened vertically and left and right at the same time. The die opening speed is fast, the production efficiency is high, and it can meet the die opening requirements of flanged valve body and special-shaped valve body forgings. Wide range of applications; during the forging process, the left die and right die have very low horizontal pressure on the left die pad and right die pad, and the wear is small, the equipment cost is low, and the service life is long.

Description of drawings

Fig. 1 is the structural schematic diagram of the forging state of the present invention.

Figure 2 is a schematic structural diagram of the present invention before forging.

Detailed ways

The valve body forging die as shown in Fig. 1 and Fig. 2 includes a left die 3, a right die 9 and an upper die 8. Concave structures are formed on the opposite side walls of the left die 3 and the right die 9 respectively. The concave structure of the die 9 is connected to form a cavity consistent with the shape of the valve body forging, the upper end of the cavity forms an opening, and the upper die 8 is located directly above the opening. The forging piece 4 is forged so that the shape is consistent with the shape of the cavity. Moving in the left and right directions in the groove, the left side of the left die 3 is connected with the left machine press slide block 2 through the left die pad 1, the right side of the right die 9 is connected with the right machine press slide block 10 through the right die pad 13, and the upper end of the upper die 8 is connected with the right machine press slide block 10. The upper die pad 6 is connected to the upper press slide block 5, the upper end face of the upper die 8 is fixedly installed in the lower plane of the upper die pad 6 by the upper die pad 7, and the upper die pad 6 is fixedly installed on the upper die pad 6. Slider 5 lower end face. The left machine pressing slide 2, the right machine pressing slide 10, and the upper machine pressing slide 5 are respectively fixedly connected with the pressure output shaft of the hydraulic press. During forging, the pressure output shaft of the hydraulic press first pushes the left machine pressing slide 2 and the right machine pressing slide. The slider 10 presses the left die 3 and the right die 9 into the positioning groove on the upper plane of the bottom plate, and then pushes the upper press slider 5 to press the upper die 8 into the cavity, and forge the forging 4 in the cavity into a shape Consistent with the shape of the cavity, the two planes are pressed and contacted during forging between the left machine press slider 2 and the left die backing plate 1, and between the right machine press slide block 10 and the right die backing plate 13. The matching structure in which the plane is out of contact; when the mold is opened, the left mold 3 and the right mold 9 move left and right respectively, and the upper mold 8 moves upward at the same time, and the forging 4 can be taken out. The mold opening speed is fast and the production efficiency is high. Moreover, the left mold 3 It can be used for forgings with flanged valve bodies and various shapes of special-shaped valve bodies, and has a wide range of applications. In addition, during the forging process, the horizontal force generated by the left die 3 and the right die 9 on the left die pad 1 and the right die pad 13 is small, and the wear is also small, which reduces the manufacturing cost of the die and prolongs the service life.

The overall shape of the left die 3 and the right die 9 after docking is a cylinder, and the opposite surfaces of the left die pad 1 and the right die pad 13 are semi-cylindrical concave surfaces, which are equal to the outer cylindrical surface of the cylinder after they are connected. A cylindrical hole with a diameter to hold the left die 3 and the right die 9 in the circumferential direction.

The overall shape of the left die 3 and the right die 9 after the butt joint is square, the center of the left side plane of the left die 3 has a protruding positioning plane and the limit concave hole at the corresponding position of the left die backing plate 1 cooperates with each other, and the right side of the right die 9 The center of the plane is provided with a protruding positioning plane which cooperates with the limiting concave holes at the corresponding positions of the right die pad 13 .

A protruding positioning cylindrical ring is made in the middle of the outer circular surface of the cylinder, and semi-cylindrical concave surfaces of the left die backing plate 1 and the right die backing plate 13 are respectively made with semi-cylindrical rings that are adapted to the positioning cylindrical ring. Locate grooves.

The bottom plate is composed of the lower moulding plate 12 fixedly installed in the upper plane of the lower moulding plate 14, the lower mould 11 is fixedly installed at the center of the lower moulding plate 12, and the lower end faces of the left mould 3 and the right mould 9 have a lower opening that communicates with their internal cavity, The upper end of the lower die 11 protrudes into the cavity from the lower opening, which can forge the lower end face hole of the valve body forging, saving materials, especially for valve body forgings made of precious metal materials such as nickel-based alloys, it can greatly reduce the valve body. manufacturing cost.

Claims (5)

1. A valve body forging die comprises a left die (3), a right die (9) and an upper die (8), wherein concave structures are respectively formed on the opposite side walls of the left die (3) and the right die (9), the concave structures of the left die (3) and the right die (9) are butted to form a cavity with the same shape as a valve body forging, an opening is formed at the upper end of the cavity, and the upper die (8) is positioned right above the opening; the method is characterized in that: the lower end faces of the left die (3) and the right die (9) are movably placed in a positioning groove in the upper plane of the bottom plate, the left side of the left die (3) is connected with the left machine pressing sliding block (2) through the left die base plate (1), the right side of the right die (9) is connected with the right machine pressing sliding block (10) through the right die base plate (13), and the upper end of the upper die (8) is connected with the upper machine pressing sliding block (5) through the upper die base plate (6).

2. The valve body forging die of claim 1, wherein: the whole appearance after the left die (3) and the right die (9) are butted is a cylinder, the opposite surfaces of the left die backing plate (1) and the right die backing plate (13) are semi-cylindrical concave surfaces, and the two are butted to form a cylindrical hole with the diameter equal to that of the outer cylindrical surface of the cylinder.

3. The valve body forging die of claim 1, wherein: the whole appearance after left mould (3) and right mould (9) butt joint is the square, and left side plane center system has convex location plane and left mould backing plate (1) to correspond the spacing shrinkage pool of position and mutually supports, and right side plane center system has convex location plane and right mould backing plate (13) to correspond the spacing shrinkage pool of position and mutually supports in left side mould (3) left side plane system.

4. The valve body forging die of claim 2, wherein: the middle of the outer circular surface of the cylinder is provided with a convex positioning cylindrical ring, and semi-cylindrical concave surfaces of the left die base plate (1) and the right die base plate (13) are respectively provided with semi-cylindrical positioning grooves matched with the positioning cylindrical ring.

5. The valve body forging die of claim 1, 2, 3 or 4, wherein: the bottom plate is formed by fixedly mounting a lower die pressing plate (12) in an upper plane of a lower die base plate (14), a lower die (11) is fixedly mounted at the center of the lower die pressing plate (12), the centers of the lower end faces of the left die (3) and the right die (9) are provided with lower openings communicated with internal cavities of the left die and the right die, and the upper ends of the lower dies (11) extend into the cavities from the lower openings.

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