A rolling die for steel mesh and use method thereof

Abstract

The present invention relates to a rolling die for steel mesh and a method of using the same. It includes a lower die assembly and an upper die assembly, wherein the lower die assembly includes a base, a lower pad and a lower die, and the upper die assembly includes a mounting plate, an upper pad and an upper die. The lower die assembly also includes a constraint frame, a lifting seat is fixed on the constraint frame, and a plurality of lower pull rods are provided on the lifting seat, and the lower ends of the lower pull rods pass through the base, and a plurality of upper pull rods are provided on the mounting plate, and the lower ends of the upper pull rods pass through the base, and the base is provided with a plurality of first piston cylinders and second piston cylinders, and a first piston is provided in the first piston cylinder, and a second piston is provided in the second piston cylinder, and a first oil chamber is formed in the first piston and between the first piston and the base, and a second oil chamber is formed in the second piston and between the second piston and the base, and an oil path connecting the first oil chamber and the second oil chamber is provided in the base. The present invention has an automatic demoulding effect, and the overall structure is streamlined, and no other power is required.

Description

Technical Field

[0001] The invention relates to a rolling die, in particular to a rolling die for a steel mesh and a use method thereof. Background Art

[0002] When setting up sunken cavities such as manholes and equipment wells on the roads, manhole covers need to be installed at their openings. On some slopes connecting the ground and underground spaces, the corresponding manhole covers need to have excellent water permeability. Therefore, the manhole covers in these areas are generally steel mesh structures. Compared with ordinary drainage manhole covers, steel mesh has more pores per unit area and better water permeability. Existing steel meshes are welded from multiple steel bars. Although casting is much more efficient than welding, the strength of cast steel meshes is poor and cannot bear heavy weight.

[0003] Therefore, the steel mesh is produced by the rolling process, which is a hot rolling process. The forged piece needs to be heated to about 1000 degrees Celsius before being placed in a die for forging. When forging the steel mesh, a component for constraining the outer contour of the forging needs to be set on the lower die. During the forging process, the component plays a role in fixing the shape of the steel mesh. However, after forging, a great friction force will be generated between the forging and the inner wall of the component, making it difficult to remove the forging. Therefore, it is necessary to design a simple and reliable rolling die to solve this problem. Summary of the invention

[0004] The invention provides a rolling die for a steel mesh, which solves the problem in the prior art that a steel mesh forging is difficult to be taken out from the die after rolling.

[0005] The above technical problems of the present invention are mainly solved by the following technical solutions: a rolling die for steel mesh, comprising a lower die assembly and an upper die assembly, the lower die assembly comprising a base, a lower pad and a lower die, the upper die assembly comprising a mounting plate, an upper pad and an upper die, the lower die assembly also comprising a constraint frame slidably sleeved on the outer side of the lower die, a lifting seat is fixed on the constraint frame, at least three lower pull rods are fixed vertically downward on the lifting seat, the lower end of the lower pull rod passes through the base, at least three upper pull rods are fixed vertically downward on the mounting plate, the lower end of the upper pull rod passes through the base, the base is in a closed sliding fit with the upper pull rod and the lower pull rod, and a plurality of A first piston cylinder and a second piston cylinder, a first piston is sealed and slidably fitted in the first piston cylinder, a second piston is sealed and slidably fitted in the second piston cylinder, the upper pull rod coaxially passes through the first piston and is sealed and slidably fitted, a limiting cap is provided at the lower end of the upper pull rod, the lower pull rod coaxially passes through the second piston and is fixedly connected, a first oil chamber is formed in the first piston and between the first piston and the base, a second oil chamber is formed in the second piston and between the second piston and the base, an oil path connecting the first oil chamber and the second oil chamber is provided in the base, any first oil chamber has and only has one second oil chamber connected, and a plurality of return springs are connected between the lifting seat and the base.

[0006] The lower die assembly in the present invention is fixedly connected to the workbench of the hydraulic press through the base thereon, and the upper die assembly is fixedly connected to the hydraulic rod through the mounting plate thereon. The hydraulic rod plays a role in controlling lifting and guiding, and the outer contours of the upper die and the lower die are consistent and face each other. When the present invention performs the first stage of mold closing action, the upper die assembly descends as a whole, driving the upper pull rod to move downward, and the limit cap descends, causing the bottom of the first piston to lose the limit of the limit cap, and the elastic force generated by the reset spring will cause the lower pull rod and the second piston to have an upward trend, thereby causing the hydraulic oil in the second oil chamber to flow to the first oil chamber. While the first piston descends, the lifting seat rises under the push of the reset spring until the top of the second piston abuts against the base. At this time, the constraint frame is higher than the upper surface of the lower die, and a concave cavity where the forging can be positioned is defined between the two. This stage is an empty stroke. When the first stage of mold closing action is completed, loading can be carried out, that is, the workpiece to be forged is placed in the concave cavity; when the present invention performs the second stage of mold closing action, the upper die continues to It descends until it enters the concave cavity along the inner wall of the constraint frame, and presses the forging until it reaches the lower dead point; when the present invention performs the first stage mold opening action, the upper mold assembly rises as a whole, the limit cap gradually approaches the first piston, the upper mold is separated from the lower mold, the lifting seat remains at a high position and does not move, the forging is clamped inside the constraint frame, and this stage is an empty stroke; as the upper mold assembly continues to move upward, the present invention performs the second stage mold opening action, the upper mold assembly drives the upper pull rod to move upward, the limit cap resists the first piston and moves upward synchronously, and under the action of the hydraulic oil, the second piston moves in the opposite direction, driving the lower pull rod and the lifting seat to descend, and the reset spring is compressed again, so that the constraint frame is pulled downward, thereby realizing the demolding of the forging, which is convenient for the blanking operation.

[0007] The present invention also provides a method for using a rolling die, characterized in that the rolling die is the above-mentioned rolling die for steel mesh, and the method for using is divided into: loading, controlling the hydraulic press to press down, so that the rolling die performs the first stage of mold closing action, and after the constraint frame is in a high position, the forged part is placed on the lower die; rolling, controlling the hydraulic press to press down, so that the rolling die performs the second stage of mold closing action, the upper die and the lower die perform a rolling action, and the forged part becomes a forged part; opening the die, controlling the hydraulic press to lift and reset, and the rolling die becomes an open die state again; unloading, controlling the hydraulic press to continue lifting and resetting, and when the constraint frame drops to a low position, the forged part is removed from the lower die.

[0008] Therefore, compared with the prior art, the present invention has the following characteristics: 1. The present invention can utilize the pulling force of the hydraulic press to rise and reset, and convert it into the pulling force for pulling the constraint frame down through hydraulic pressure, so that during the mold opening process, the constraint frame can descend autonomously to complete the demolding of the forging, which is convenient for unloading. At the same time, in the initial stage of the hydraulic press pressing down, the effect of the reset spring can be utilized to lift and reset the constraint frame for positioning the forging. The overall structure is streamlined and no other power is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Attached Figure 1 It is a structural schematic diagram of the present invention;

[0010] Attached Figure 2 is a bottom view of the present invention;

[0011] Attached Figure 3 Yes Figure 2 AA section view, the constraint frame is at a high position;

[0012] Attached Figure 4 Yes Figure 2 AA section view, the constraint frame is at a low position;

[0013] Attached Figure 5 Yes Figure 2 BB section view, the upper die is in the high position;

[0014] Attached Figure 6 Yes Figure 2 BB section view, the upper die is in the low position;

[0015] Attached Figure 7 It is a structural diagram of the first piston or the sealing sleeve;

[0016] Attached Figure 8 It is a structural diagram of the second piston.

[0017] In the figure: 100, lower mold assembly; 200, upper mold assembly; 110, base; 120, lower pad; 130, lower mold; 210, mounting plate; 220, upper pad; 230, upper mold; 140, constraint frame; 150, lifting seat; 160, lower pull rod; 240, upper pull rod; 171, first piston cylinder; 172, second piston cylinder; 181, first piston; 182, second piston; 241, limit cap; 191, first oil chamber; 192, second oil chamber; 111, oil circuit; 190, return spring; 112, mounting hole; 10, sealing sleeve; 113, upper limit portion; 21, first outer oil seal; 22, first inner oil seal; 23, second outer oil seal; 24, third outer oil seal; 25, second inner oil seal. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0020] Example 1: See Figure 1 and Figure 2 , a rolling die for a steel mesh, the steel mesh has a square outer contour, the rolling die includes a lower die assembly 100 and an upper die assembly 200, the lower die assembly includes a base 110, a lower pad 120 and a lower die 130, the upper die assembly includes a mounting plate 210, an upper pad 220 and an upper die 230, the lower die assembly 100 also includes a constraint frame 140 slidably sleeved on the outer side of the lower die 130, a lifting seat 150 is fixed on the constraint frame 140, four lower pull rods 160 are fixed vertically downward on the lifting seat 150, the lower end of the lower pull rod 160 passes through the base 110, four upper pull rods 240 are fixed vertically downward on the mounting plate 210, the lower end of the upper pull rod 240 passes through the base 110, the base 110 is in a closed sliding fit with the upper pull rod 240 and the lower pull rod 160, four first piston cylinders 171 and four second piston cylinders 172 are vertically provided at the bottom of the base 110, the first piston A first piston 181 is sealed and slidably fitted in the cylinder 171, and a second piston 182 is sealed and slidably fitted in the second piston cylinder 172. The upper pull rod 240 coaxially penetrates the first piston 181 and is sealed and slidably fitted. A limit cap 241 is provided at the lower end of the upper pull rod 240. The lower pull rod 160 coaxially penetrates the second piston 182 and is fixedly connected. A first oil chamber 191 is formed in the first piston 181 and between the first piston 181 and the base 110, and a second oil chamber 192 is formed in the second piston 182 and between the second piston 182 and the base 110. An oil path 111 connecting the first oil chamber 191 and the second oil chamber 192 is provided in the base 110. Any first oil chamber 191 has and only has one second oil chamber 192 connected. At the same time, four return springs 190 are connected between the lifting seat 150 and the base 110, and the return spring sleeves 190 are provided on the four lower pull rods 160.

[0021] See Figures 3 to 6In this embodiment, the lower mold 130 component 100 is fixedly connected to the workbench of the hydraulic press through the base 110 thereon, and the upper mold 230 component 200 is fixedly connected to the hydraulic rod through the mounting plate 210 thereon. The hydraulic rod plays a role in controlling the lifting and guiding. The outer contours of the upper mold 230 and the lower mold 130 are consistent and face each other. When the first stage of the mold closing action is performed in this embodiment, the upper mold 230 assembly 200 descends as a whole, driving the upper pull rod 240 to move downward, and the limit cap 241 descends, causing the bottom of the first piston 181 to lose the limit of the limit cap 241, and the elastic force generated by the return spring 190 will cause the lower pull rod 160 and the second piston 182 to have an upward trend, thereby causing the hydraulic oil in the second oil chamber 192 to flow to the first oil chamber 191. While the first piston 181 descends, the lifting seat 150 rises under the push of the return spring 190 until the top of the second piston 182 abuts against the base 110. At this time, the constraint frame 140 is partially higher than the upper surface of the lower mold 130, and a concave cavity where the forging can be positioned is defined between the two. This stage is an empty stroke. When the first stage of the mold closing action is completed, the material can be loaded, that is, the workpiece to be forged is placed in the concave cavity; when the second stage of the mold closing action is performed in this embodiment, the upper mold 230 continues to descend. The forging is then pressed and rolled until it enters the concave cavity along the inner wall of the constraint frame 140, and the forging is pressed and rolled until it reaches the lower dead point; when the first stage of mold opening action is performed in this embodiment, the upper mold 230 assembly 200 rises as a whole, the limiting cap 241 gradually approaches the first piston 181, the upper mold 230 is separated from the lower mold 130, the lifting seat 150 remains at a high position and does not move, and the forging is fixed inside the constraint frame 140. This stage is an empty stroke; as the upper mold 230 assembly 200 continues to move upward, the second stage of mold opening action is performed in this embodiment, the upper mold 230 assembly 200 drives the upper pull rod 240 to move upward, the limiting cap 241 resists the first piston 181 and moves upward synchronously, and under the action of the hydraulic oil, the second piston 182 moves in the opposite direction, driving the lower pull rod 160 and the lifting seat 150 to descend, and the reset spring 190 is compressed again, so that the constraint frame 140 is pulled downward, thereby realizing the demolding of the forging, which is convenient for the blanking operation.

[0022] See Figure 3 The base 110 is provided with eight mounting holes 112, in which a sealing sleeve 10 is fixed. The sealing sleeve 10 is sleeved on the upper pull rod 240 and the lower pull rod 160 to achieve a closed sliding fit; an upper limit portion 113 is provided at the upper end of the mounting hole 112, and the upper end of the sealing sleeve 10 abuts against the upper limit portion 113.

[0023] See Figure 5 The bottom of the sealing sleeve 10 is higher than the lower opening of the mounting hole 112 , and the opening of the oil passage 111 is arranged on the side wall of the mounting hole 112 below the sealing sleeve 10 .

[0024] See Figure 7 and Figure 8Three first outer oil seals 21 are sleeved on the outer wall of the first piston 181, and three first inner oil seals 22 are sleeved on the inner wall of the first piston 181; three second outer oil seals 23 are sleeved on the outer wall of the second piston 182; three third outer oil seals 24 are sleeved on the outer wall of the sealing sleeve 10, and three second inner oil seals 25 are sleeved on the inner wall of the sealing sleeve 10.

[0025] The present embodiment also provides a method for using a rolling die, which is the above-mentioned rolling die for steel mesh, and the method for using the die is divided into: loading, controlling the hydraulic press to press down, so that the rolling die performs the first stage of mold closing action, and after the constraint frame is in a high position, the forged piece is placed on the lower die; rolling, controlling the hydraulic press to press down, so that the rolling die performs the second stage of mold closing action, and the upper and lower dies perform a rolling action, and the forged piece becomes a forging; opening the die, controlling the hydraulic press to lift and reset, and the rolling die returns to the open die state; unloading, controlling the hydraulic press to continue lifting and resetting, and when the constraint frame drops to a low position, the forging is removed from the lower die.

[0026] The present invention can be modified in various ways which are obvious to those skilled in the art, and such modifications are not considered to depart from the scope of the present invention. All such modifications which are obvious to those skilled in the art are intended to be included within the scope of the present claims.

Claims

1. A rolling die for a steel mesh, comprising a lower die assembly and an upper die assembly, wherein the lower die assembly comprises a base, a lower pad and a lower die, and the upper die assembly comprises a mounting plate, an upper pad and an upper die, characterized in that: The lower mold assembly also includes a constraint frame slidably sleeved on the outer side of the lower mold, a lifting seat is fixed on the constraint frame, at least three lower pull rods are fixed vertically downward on the lifting seat, the lower end of the lower pull rod passes through the base, at least three upper pull rods are fixed vertically downward on the mounting plate, the lower end of the upper pull rod passes through the base, the base and the upper pull rod and the lower pull rod are in a closed sliding fit, a plurality of first piston cylinders and second piston cylinders are vertically arranged at the bottom of the base, a first piston is in a closed sliding fit in the first piston cylinder, a second piston is in a closed sliding fit in the second piston cylinder, the upper pull rod coaxially passes through the first piston and is in a closed sliding fit, a limiting cap is provided at the lower end of the upper pull rod, the lower pull rod coaxially passes through the second piston and is fixedly connected, a first oil chamber is formed in the first piston and between the first piston and the base, a second oil chamber is formed in the second piston and between the second piston and the base, an oil path connecting the first oil chamber and the second oil chamber is provided in the base, and a plurality of return springs are connected between the lifting seat and the base; The mold closing action is divided into two stages. In the first stage, the upper mold assembly drives the upper pull rod to move downward, and the bottom of the first piston loses the limit of the limit cap. At the same time, the return spring begins to push the lifting seat to rise. At this time, the second piston rises synchronously, pushing the first piston down. In the second stage, the upper mold assembly continues to press down, and the lifting seat has reached a high position and remains motionless; the mold opening action is also divided into two stages. In the first stage, the upper mold assembly drives the upper pull rod to move upward, and the lifting seat remains at a high position. In the second stage, the upper pull rod rises until the limit cap abuts against the first piston, and pushes it to move upward synchronously, causing the second piston to move in the opposite direction, driving the lower pull rod and the lifting seat to descend.

2. The rolling die for steel mesh according to claim 1, characterized in that: The base is provided with a plurality of mounting holes, and sealing sleeves are fixedly provided in the mounting holes. The sealing sleeves are sleeved on the upper pull rod and the lower pull rod to achieve a closed sliding fit.

3. The rolling die for steel mesh according to claim 2, characterized in that: An upper limit portion is provided at the upper end of the mounting hole, and the upper end of the sealing sleeve abuts against the upper limit portion.

4. The rolling die for steel mesh according to claim 2, characterized in that: The bottom of the sealing sleeve is higher than the lower opening of the mounting hole, and the opening of the oil circuit is arranged on the side wall of the mounting hole below the sealing sleeve.

5. The rolling die for steel mesh according to claim 2, characterized in that: A plurality of first outer oil seals are sleeved on the outer wall of the first piston, and a plurality of first inner oil seals are sleeved on the inner wall of the first piston; a plurality of second outer oil seals are sleeved on the outer wall of the second piston; a plurality of third outer oil seals are sleeved on the outer wall of the sealing sleeve, and a plurality of second inner oil seals are sleeved on the inner wall of the sealing sleeve.

6. A method for using a rolling die, characterized in that: The rolling die is the rolling die for steel mesh as described in any one of claims 1 to 5, and the method of use is divided into: loading, controlling the hydraulic press to press down, so that the rolling die performs the first stage of mold closing action, and after the constraint frame is in a high position, the forged part is placed on the lower die; rolling, controlling the hydraulic press to press down, so that the rolling die performs the second stage of mold closing action, the upper die and the lower die perform a rolling action, and the forged part becomes a forging; opening the die, controlling the hydraulic press to lift and reset, and the rolling die becomes an open die state again; unloading, controlling the hydraulic press to continue lifting and resetting, and when the constraint frame drops to a low position, the forging is removed from the lower die.

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