Replacement mechanism and replacement method for large sub-die holder of hot die forging press

Abstract

The invention discloses a hot die forging press large-scale sub-die holder replacement mechanism and method. The hot die forging press large-scale sub-die holder replacement mechanism comprises an upper support, a lower support, a lifting hydraulic cylinder, a first hydraulic motor speed reducer, a second hydraulic motor speed reducer, a first arm rod, a second arm rod and a tray, and the upper support and the lower support are both fixed to a press stand column; the upper end of the piston rod is rotationally connected with the upper support, the lower end of the piston rod is rotationally connected with the lower support, and the piston rod is driven by a first hydraulic motor speed reducer to rotate; an oil inlet and an oil outlet are respectively arranged at two ends of the cylinder body to control the oil inlet and outlet quantity above and below the piston in the inner cavity of the cylinder body, so that the piston rod is fixed and the cylinder body ascends or descends; the piston rod rotates to drive the first arm rod to rotate, the first arm rod is rotationally connected with the second arm rod, and the second arm rod is fixedly connected with the tray. The quick die changing device meets the quick die changing requirement of large equipment, is flexible to operate and short in changing time, improves the forging efficiency and does not occupy extra sites after being used.

Description

Technical Field

[0001] The invention belongs to the technical field of press equipment, and in particular relates to a large sub-die base replacement mechanism and a replacement method for a hot die forging press. Background Art

[0002] The booming automobile industry has become an important driving force for China's rapid economic growth. With the ever-expanding automobile market, the demand for automobile parts production is also increasing. In forging production, mold replacement is an important part of the conversion process. With the increase in mold wear or the change of product varieties, molds will be replaced frequently. In order to improve the equipment operation rate during production, two sets of sub-die holders are generally equipped. The mold to be replaced is loaded into the sub-die holder offline, and then the sub-die holder and mold on the line are dragged out and directly replaced with another set of molds and sub-die holders to be produced. Therefore, optimizing the structure of the mold changing device is the key to improving production efficiency and reducing the manufacturing cost of presses.

[0003] In hot die forging presses, die and die holders are heavy and bulky, so die change is difficult, time-consuming and inefficient. There are many traditional die change systems for press dies and die holders, such as:

[0004] 1. Manual mold change. When unloading the mold, the mold and the sub-mold base are dragged out of the working area of ​​the press by manual labor and general lifting tools, and unloaded by a forklift or a crane. When loading the mold, the forklift or the crane places the sub-mold base on the workbench, and then the worker performs the positioning operation. Then, according to the current parameters, the mold loading height is manually adjusted and the mold and sub-mold base of the next workpiece are dragged in. The length of the mold change time varies greatly with the size, weight and complexity of the mold. Especially for large and heavy presses, the downtime of the above mold change method sometimes even exceeds the processing time.

[0005] 2. Use a transport trolley to cooperate with the lifting equipment to change the mold. The mold changing trolley runs on a fixed track. When changing the mold, the mold base is first carried by the mold changing trolley, and then the upper and lower molds are realized through the push-pull system. When lifting, it takes time to find the mold base and equipment positioning, the mold changing efficiency is low, and there are safety hazards. In terms of cost, it is necessary to replace the mold trolley and pre-embed the guide rails. In addition, since the mold changing trolley requires a large space for activities, the site utilization rate of the workshop is low. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a large-scale sub-die base replacement mechanism and replacement method for a hot die forging press. The replacement mechanism is fixed on the column of the hot die forging press by a bracket, and adopts a cantilever joint structure. The lifting hydraulic cylinder in the mechanism realizes the lifting function of the die changing mechanism, and the hydraulic motor reducer drives the arm of the die changing to rotate; a tray is installed on the arm to support the sub-die base to move in or out of the press to complete the operation of replacing the sub-die base and the die. In production, only the button needs to be operated, and the sub-die base can be replaced through hydraulic drive, which meets the needs of fast die change of large equipment. The operation is flexible, and the maximum load weight can be achieved. The replacement time does not exceed 20 minutes, shortening the auxiliary work time and improving the forging efficiency; after use, it is rotated to the side of the press without occupying additional space.

[0007] The present invention is implemented as follows: a large-size sub-die base replacement mechanism for a hot die forging press comprises an upper bracket, a lower bracket, a lifting hydraulic cylinder, a first hydraulic motor reducer, a second hydraulic motor reducer, a first arm, a second arm, and a tray.

[0008] The upper bracket and the lower bracket are both fixed on the column of the hot die forging press, the upper bracket is located at the top, and the lower bracket is located at the bottom; both ends of the piston rod of the lifting hydraulic cylinder extend out of the cylinder body, the upper end of the piston rod is rotatably connected to the upper bracket, and the lower end of the piston rod is rotatably connected to the lower bracket, and the piston rod is driven to rotate by the first hydraulic motor reducer;

[0009] The two ends of the cylinder body are respectively provided with oil inlet and outlet ports to control the oil inlet and outlet amounts above and below the piston in the cylinder body cavity, so that the piston rod is fixed and the cylinder body rises or falls; the rotation of the piston rod drives the first arm rod to rotate, the first arm rod is rotatably connected to the second arm rod, and the rotating shaft at the rotating connection is driven to rotate by the second hydraulic motor reducer, and the second arm rod is fixedly connected to the pallet.

[0010] In the above technical solution, preferably, the upper and lower parts of the piston rod are respectively provided with a raised key, and the upper and lower parts are respectively equipped with a guide sleeve, and the inner wall of each guide sleeve is provided with a key groove. At any time, at least one of the two guide sleeves is connected to the piston rod key through the raised key, and the two guide sleeves are respectively fixedly installed at both ends of the first arm by bolts.

[0011] In the above technical solution, preferably, the first arm is welded outside the cylinder body of the lifting hydraulic cylinder or is integrally formed with the cylinder body of the lifting hydraulic cylinder.

[0012] In the above technical solution, preferably, the first arm and the second arm are both welded structures.

[0013] In the above technical solution, preferably, the upper end of the piston rod is rotatably connected to the upper bracket via a first bearing, and the lower end of the piston rod is rotatably connected to the lower bracket via a second bearing.

[0014] In the above technical solution, it is further preferred that the first bearing is installed in the upper bracket through a first pressure cover, and the second bearing is installed in the lower bracket through a second pressure cover.

[0015] Another object of the present invention is to provide a method for replacing a large sub-die seat of a hot die forging press using the above-mentioned replacement mechanism, comprising the following steps:

[0016] 1) Through the built-in program positioning of the hot die forging press control system, operate the sub-die base replacement mechanism to lift and swing the arm, transport the pallet to the front side of the hot die forging press, and align it with the sub-die base; the sub-die base push-pull cylinder pushes the sub-die base out and pushes it onto the pallet; the hydraulic motor reducer drives the two arm rods to rotate a certain angle, so that the sub-die base reaches the lifting position, and the sub-die base is lifted away by the overhead crane;

[0017] 2) Then the sub-die base to be replaced is hoisted onto the pallet, and after the sub-die base is positioned and locked by the positioning pin, the two arms are swung back, and then the sub-die base push-pull cylinder pulls the sub-die base to be replaced and the die into the die base of the hot die forging press;

[0018] 3) After replacing the die holder, operate the die holder replacement mechanism to move to the side of the hot die forging press to complete the die change.

[0019] Compared with the previous mold changing method, the advantages and positive effects of the present invention are:

[0020] 1. The mold changing mechanism of the present invention does not require manual operation such as forklifts and cranes to move the molds. In production, only the button needs to be operated and the mold can be replaced by hydraulic drive, which reduces the probability of human operation errors and realizes automatic positioning, meeting the needs of fast mold changing of large equipment. The operation is convenient and safe in production, shortens the mold changing time, and reduces the downtime of the press. While realizing fast mold changing, ensuring the accuracy and reliability of each mold changing action is an important part of improving production efficiency and realizing a more intelligent automated modern factory.

[0021] 2. The sub-die base replacement mechanism of the present invention has a load weight of up to five tons, and can realize the replacement of the sub-die base and the mold together. The replacement time does not exceed 20 minutes, which shortens the auxiliary work time and improves the forging efficiency.

[0022] 3. Compared with the additional configuration of the mold changing trolley, the sub-mold base replacement mechanism of the present invention has a simpler and more reliable structure, which can not only control the cost, but also avoid the maintenance work of the mold changing trolley in the later stage, save the occupied space, and improve the utilization rate of the workshop site. After use, it can be rotated to the side of the press without occupying additional space. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a three-dimensional schematic diagram of the sub-die base replacement mechanism of the present invention installed on a hot die forging press;

[0024] Figure 2 It is a front view of the sub-die base replacement mechanism of the present invention installed on a hot die forging press;

[0025] Figure 3 is a side view of the sub-die base replacement mechanism of the present invention installed on a hot die forging press;

[0026] Figure 4 is a top view of the sub-die base replacement mechanism of the present invention installed on a hot die forging press;

[0027] Figure 5 It is a cross-sectional view of the lifting hydraulic cylinder of the present invention.

[0028] In the figure: 1. first hydraulic motor reducer; 2. upper bracket; 3. first arm; 4. lower bracket; 5. second hydraulic motor reducer; 6. lifting hydraulic cylinder; 61. piston rod; 62. cylinder body; 7. tray; 8. second arm; 9. sub-mold base push-pull cylinder; 10. guide sleeve; 11. first bearing; 12. first pressure cover; 13. second bearing; 14. second pressure cover. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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", "fourth", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "connection", "installation" and "fitting" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] See also Figure 1 to Figure 5 The embodiment of the present invention provides a large-scale sub-die base replacement mechanism for a hot die forging press, comprising an upper bracket 2, a lower bracket 4, a lifting hydraulic cylinder 6, a first hydraulic motor reducer 1, a second hydraulic motor reducer 5, a first arm 3, a second arm 8, and a tray 7; the upper bracket 2 and the lower bracket 4 are both fixed on the column of the hot die forging press, the upper bracket 2 is located at the top, and the lower bracket 4 is located at the bottom; both ends of the piston rod 61 of the lifting hydraulic cylinder 6 extend out of the cylinder body 62, the upper end of the piston rod 61 is rotatably connected to the upper bracket 2, and the piston rod The lower end of 61 is rotatably connected to the lower bracket 4, and the piston rod 61 is driven to rotate by the first hydraulic motor reducer 1; the two ends of the cylinder body 62 are respectively provided with oil inlet and outlet ports to control the oil inlet and outlet amounts above and below the piston in the inner cavity of the cylinder body 62, so that the piston rod 61 is fixed and the cylinder body 62 rises or falls; the rotation of the piston rod 61 drives the first arm 3 to rotate, and the first arm 3 is rotatably connected to the second arm 8, and the rotating shaft at this rotating connection is driven to rotate by the second hydraulic motor reducer 5, and the second arm 8 is fixedly connected to the tray 7.

[0033] The replacement mechanism is fixed on the column of the hot die forging press, driven by a hydraulic motor reducer, and adopts a cantilever joint structure with double arms and double axes. The pressure oil of the lifting hydraulic cylinder 6 enters the lifting hydraulic cylinder 6 through the solenoid valve, and the arm is raised and lowered through the movement of the cylinder body 62, so as to realize the lifting and lowering of the sub-die base replacement mechanism. The two rotating shafts are equipped with hydraulic motor reducers. The pressure oil of the hydraulic motor enters the hydraulic motor through the solenoid valve to drive the forward and reverse rotation, control the angles of the two arms, and make the tray 7 reach the specified position.

[0034] When changing dies in a hot die forging press, the built-in program positioning is used to operate the sub-die base replacement mechanism to lift and swing the arm, and the pallet 7 is transported to the front side of the press and aligned with the sub-die base; the sub-die base push-pull cylinder pushes the sub-die base out and pushes it onto the pallet 7; the hydraulic motor drives the die change arm to rotate a certain angle so that the sub-die base reaches the lifting position, and the sub-die base is lifted away by the overhead crane. Then the sub-die base to be replaced is lifted onto the pallet 7, and after the positioning pin is used to position and lock the sub-die base, the die change arm is swung back, and the sub-die base push-pull cylinder pulls the sub-die base to be replaced and the die into the hot die forging press die base. After replacing the sub-die base, the sub-die base replacement mechanism is operated to move to the side of the hot die forging press to complete the die change.

[0035] As a preferred embodiment, the upper and lower parts of the piston rod 61 are respectively provided with a raised key, and the upper and lower parts are respectively equipped with a guide sleeve 10, and the inner wall of each guide sleeve 10 is provided with a key slot. At any time, at least one of the two guide sleeves 10 is key-connected with the piston rod 61 through the raised key, and the two guide sleeves 10 are respectively fixedly installed at both ends of the first arm 3 by bolts. The piston rod 61 transmits its rotational force to the first arm 3 through the guide sleeve 10, driving the first arm 3 to rotate smoothly. The piston rod 61, the guide sleeve 10, and the cylinder body 62 are sealed to avoid oil pressure fluctuations caused by sealing problems in the lifting hydraulic cylinder 6.

[0036] As a preferred embodiment, the first arm is welded outside the cylinder body of the lifting hydraulic cylinder or is integrally formed with the cylinder body of the lifting hydraulic cylinder to ensure that the first arm is securely installed and fixed.

[0037] As a preferred embodiment, the first arm 3 and the second arm 8 are both welded structures to ensure the strength of the arms.

[0038] As a preferred embodiment, the upper end of the piston rod 61 is rotatably connected to the upper bracket 2 through a first bearing 11, and the lower end of the piston rod 61 is rotatably connected to the lower bracket 4 through a second bearing 13, so as to ensure the smooth rotation of the piston rod 61. The first bearing 11 is installed in the upper bracket 2 through a first pressure cap 12, and the second bearing 13 is installed in the lower bracket 4 through a second pressure cap 14.

[0039] The method for replacing a large sub-die seat of a hot die forging press using the above-mentioned replacement mechanism comprises the following steps:

[0040] 1) Through the built-in program positioning of the hot die forging press control system, operate the sub-die base replacement mechanism to lift and swing the arm, transport the pallet 7 to the front side of the hot die forging press, and align it with the sub-die base; the sub-die base push-pull cylinder 9 pushes the sub-die base out and onto the pallet 7; the hydraulic motor reducer drives the two arm rods to rotate a certain angle, so that the sub-die base reaches the lifting position, and the sub-die base is lifted away by the overhead crane;

[0041] 2) Then the sub-die base to be replaced is hoisted onto the tray 7, and after the sub-die base is positioned and locked by the positioning pin, the two arms are swung back, and then the sub-die base push-pull cylinder 9 pulls the sub-die base to be replaced and the die into the die base of the hot die forging press;

[0042] 3) After replacing the die holder, operate the die holder replacement mechanism to move to the side of the hot die forging press to complete the die change.

[0043] The mold base replacement mechanism of the present invention is used to change molds. It does not require manual operation such as forklifts and cranes to deliver the molds. In production, only the button needs to be operated and the mold base can be replaced through hydraulic drive, which reduces the probability of human operation errors and realizes automatic positioning, meeting the needs of fast mold change of large equipment. The operation is convenient and safe in production, shortens the mold change time, and reduces the downtime of the press. While achieving fast mold change, ensuring the accuracy and reliability of each mold change action is an important part of improving production efficiency and realizing a more intelligent automated modern factory.

[0044] The sub-die base replacement mechanism of the present invention has a load weight of five tons, and can realize the replacement of the sub-die base and the die together. The replacement time does not exceed 20 minutes, shortening the auxiliary work time and improving the forging efficiency.

[0045] Compared with the additional configuration of the mold changing trolley, the sub-mold base replacement mechanism of the present invention has a simpler and more reliable structure, which can not only control the cost but also avoid the maintenance work of the mold changing trolley in the later stage, save the occupied space and improve the utilization rate of the workshop site. After use, it can be rotated to the side of the press without occupying additional space.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A large sub-die replacement mechanism for a hot die forging press, characterized in that: It includes an upper bracket, a lower bracket, a lifting hydraulic cylinder, a first hydraulic motor reducer, a second hydraulic motor reducer, a first arm, a second arm, and a tray; The upper bracket and the lower bracket are both fixed on the column of the hot die forging press, the upper bracket is located at the top, and the lower bracket is located at the bottom; both ends of the piston rod of the lifting hydraulic cylinder extend out of the cylinder body, the upper end of the piston rod is rotatably connected to the upper bracket, and the lower end of the piston rod is rotatably connected to the lower bracket, and the piston rod is driven to rotate by the first hydraulic motor reducer; The two ends of the cylinder body are respectively provided with oil inlet and outlet ports to control the oil inlet and outlet amounts above and below the piston in the cylinder body cavity, so that the piston rod is fixed and the cylinder body rises or falls; the rotation of the piston rod drives the first arm rod to rotate, the first arm rod is rotatably connected to the second arm rod, and the rotating shaft at the rotating connection is driven to rotate by the second hydraulic motor reducer, and the second arm rod is fixedly connected to the pallet.

2. The large sub-die replacement mechanism for hot die forging press according to claim 1, characterized in that: The upper and lower parts of the piston rod are respectively provided with a raised key, and the upper and lower parts are respectively equipped with a guide sleeve, and the inner wall of each guide sleeve is provided with a key groove. At any time, at least one of the two guide sleeves is connected to the piston rod key through the raised key, and the two guide sleeves are respectively fixedly installed at the two ends of the first arm by bolts.

3. The large sub-die replacement mechanism for hot die forging press according to claim 1, characterized in that: The first arm is welded to the cylinder body of the lifting hydraulic cylinder or is formed integrally with the cylinder body of the lifting hydraulic cylinder.

4. The large sub-die replacement mechanism for hot die forging press according to claim 1, characterized in that: The first arm and the second arm are both welded structures.

5. The large sub-die replacement mechanism for hot die forging press according to claim 1, characterized in that: The upper end of the piston rod is rotatably connected to the upper bracket via a first bearing, and the lower end of the piston rod is rotatably connected to the lower bracket via a second bearing.

6. The large sub-die replacement mechanism for hot die forging press according to claim 5, characterized in that: The first bearing is installed in the upper bracket through a first pressure cover, and the second bearing is installed in the lower bracket through a second pressure cover.

7. A method for replacing a large sub-die seat of a hot die forging press, characterized in that: The replacement method is implemented based on the replacement mechanism according to any one of claims 1 to 6, and comprises the following steps: 1) Through the built-in program positioning of the hot die forging press control system, operate the sub-die base replacement mechanism to lift and swing the arm, transport the pallet to the front side of the hot die forging press, and align it with the sub-die base; the sub-die base push-pull cylinder pushes the sub-die base out and pushes it onto the pallet; the hydraulic motor reducer drives the two arm rods to rotate a certain angle, so that the sub-die base reaches the lifting position, and the sub-die base is lifted away by the overhead crane; 2) Then the sub-die base to be replaced is hoisted onto the pallet, and after the sub-die base is positioned and locked by the positioning pin, the two arms are swung back, and then the sub-die base push-pull cylinder pulls the sub-die base to be replaced and the die into the die base of the hot die forging press; 3) After replacing the die holder, operate the die holder replacement mechanism to move to the side of the hot die forging press to complete the die change.

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