Die adjusting device of press machine

Abstract

A die adjusting device of a press machine comprises a plunger type cylinder, a guide column, a nut lifting driving mechanism, an adjusting nut, a fixing seat and an upper cross beam. The lower ends of the guide columns are fixed to the base, and the upper ends of the guide columns penetrate through and extend out of the upper beam which is in sliding fit with the guide columns. A cylinder body of the plunger type cylinder is fixed to the fixing base, the fixing base is installed on the upper cross beam, and a plunger of the plunger type cylinder is arranged at the upper end of the guide column. The adjusting nut is sleeved outside the guide post in a penetrating manner, is in threaded connection with the guide post, is positioned above the upper cross beam and in the fixed seat, and is driven by the nut lifting driving mechanism to ascend or descend along the guide post; and the nut lifting driving mechanism is mounted on the upper cross beam. The die adjusting device of the press machine is simple in structure, simple in die adjusting and high in die adjusting precision.

Description

Technical Field

[0001] This utility model relates to a mold adjustment device for a press. Background Technology

[0002] Ordinary press ball joint linkage type die height adjustment device, such as Figure 1 As shown, the upper crossbeam 1, the base 8, and the middle platform 71 are bolted together. The connecting rod 3 on the eccentric shaft 2 is threadedly connected to the ball-end screw 4. The ball end of the ball-end screw 4 is movably connected to the slider 6 through the ball-shaped pressure cap 5. A hexagonal flat screw is made near the end of the ball-end screw 4. The height of the mold on the press can be adjusted by turning the screw with a wrench to move the slider up and down. This type of mold height adjustment device has disadvantages such as complex connecting rod structure, excessively high requirements for the machining accuracy of parts, and easy wear of the ball end. At the same time, because the two connecting rods are close together, the thread error has a significant impact on the parallelism of the slider, resulting in low mold height adjustment accuracy.

[0003] Ordinary top-mounted hydraulic cylinder plunger cylinder type four-column press mold height adjustment device, such as Figure 2 As shown, the base 8, column 7, adjusting nut 11, upper crossbeam 1, plunger 10, and top-mounted cylinder 9 are integrated into one unit via a hydraulic system and threaded connection. The upper crossbeam 1 is fixed with an eccentric shaft 2, which is connected to the slider 6 via a connecting rod 3. The upper end of the column 7 is connected to the plunger 10 of the cylinder 9. The upper part of the upper crossbeam 1 is fixed with the cylinder 9, the middle part is fitted onto the column 7, and the lower part is limited by the adjusting nut 11 screwed on the column 7. When adjusting the mold height, firstly, oil enters the upper chamber of the cylinder 9 to lift the upper crossbeam 1. Then, the adjusting nut 11 is driven to rotate by the nut lifting drive mechanism installed on the upper crossbeam 1. When the adjusting nut 11 rises to the designated position, oil enters the lower chamber of the cylinder 9 to lower the upper crossbeam 1 and press it against the adjusting nut 11, thereby completing the mold height adjustment. Compared to the ball joint linkage type die height adjustment device and method for presses, this die height adjustment device and method, because its adjustment device is externally located on the slider, is beneficial for the weight reduction of the press slider. Furthermore, the larger spacing between the columns 7 helps improve the accuracy and stability of the press, and it also has overload protection functions. However, this die height adjustment device and method also have the following drawbacks: Pressurizing through the rod chamber of the top-mounted cylinder can counteract the press's punching force, thus requiring greater hydraulic pressure. Therefore, the cylinder diameter of the top-mounted cylinder must be relatively large, and the columns must withstand greater tension. Additionally, the insufficient rigidity of the hydraulic oil after pressure can easily cause stamping quality problems. Also, because the top-mounted cylinder 9 is a dual-chamber oil inlet cylinder, its structure is complex, requiring high processing standards, and maintenance and repair are also relatively complex, necessitating a more complex hydraulic system for control. Since the adjusting nut is located below the upper crossbeam, and is restricted by the slider, the nut lifting drive mechanism can only be located between the two columns, resulting in a longer transmission route. The power to the four adjusting nuts will be sequential, leading to a larger cumulative error. After prolonged use, readjustment is required; otherwise, it will affect the accuracy of the die height adjustment. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned defects of the prior art and provide a press mold adjustment device that has a simple structure, simple mold adjustment and high mold adjustment accuracy.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A mold adjustment device for a press includes a plunger cylinder, a guide column, a nut lifting drive mechanism, an adjusting nut, a fixed seat, and an upper crossbeam. The lower end of the guide column is fixed to the base, and the upper end passes through and extends out of the upper crossbeam, with the upper crossbeam slidingly engaging with the guide column. The cylinder body of the plunger cylinder is fixed to the fixed seat, which is mounted on the upper crossbeam, and the plunger of the plunger cylinder is positioned at the upper end of the guide column. The adjusting nut is sleeved on the outside of the guide column and threadedly connected to it. It is located above the upper crossbeam and within the fixed seat. The adjusting nut rises or falls along the guide column via the nut lifting drive mechanism, which is mounted on the upper crossbeam.

[0007] Even better, a planar bearing is provided between the top surface of the adjusting nut and the fixed seat, and the fixed seat limits the movement. The planar bearing causes the adjusting nut to rotate through rolling friction, thereby reducing the frictional force when the adjusting nut rotates and making it easier to rotate the adjusting nut.

[0008] Even better, the mold adjustment device further includes a pad, which is fitted onto the guide post and placed in the groove of the upper crossbeam below the adjusting nut.

[0009] Even better, a compressive force sensor is also provided inside or below the pad block. The compressive force sensor is installed inside the upper crossbeam and sleeved on the outside of the guide post.

[0010] Even better, the adjusting device further includes an upper bearing and a lower bearing, which are respectively installed on the upper and lower parts of the adjusting nut and are supported laterally by a fixed seat and by an upper crossbeam, thereby preventing the adjusting nut from moving radially due to uneven force and thus affecting the life of the adjusting nut.

[0011] Even better, the adjusting nut is placed inside the cavity of the fixed seat, so that dust or other impurities in the environment cannot easily enter the adjusting nut.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] 1. Because the plunger cylinder and adjusting nut are located on the upper part of the upper crossbeam, the stress conditions of the plunger cylinder and adjusting nut are changed. The plunger cylinder does not need to match the punching pressure of the press, and a smaller cylinder diameter can be used, which reduces the flow rate and oil pressure and avoids problems such as leakage that often occur in oil cylinders under high pressure.

[0014] 2. The adjusting nut is located on the upper part of the upper crossbeam, and the nut lifting drive mechanism can be located in the middle of the upper crossbeam. The transmission route is short, and four nuts can be driven at the same time. The cumulative error is small, and the press is simpler and more compact.

[0015] 3. The single-chamber oil inlet plunger cylinder has a simple structure, greatly reduces the requirements for machining accuracy, significantly reduces the number of machined surfaces, and is convenient for maintenance and repair.

[0016] 4. Furthermore, since the fixed seat, the plane bearing, the adjusting nut, and the upper part of the upper crossbeam are always in rigid contact and there is no relative movement between them, after the plunger cylinder is pressurized to the set value, the thread gap between the adjusting nut and the guide column can be eliminated, resulting in higher mold adjustment accuracy and thus ensuring stamping accuracy. Attached Figure Description

[0017] Figure 1 This is a front structural diagram of an existing ball-joint type mold height adjustment press.

[0018] Figure 2 This is a front structural diagram of an existing overhead piston cylinder press.

[0019] Figure 3 This is a front structural diagram of a mold adjustment device for a press according to an embodiment of the present invention.

[0020] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0021] Figure 5 This is a schematic diagram of the structure of the adjusting nut and the nut lifting drive mechanism of a press mold adjusting device according to an embodiment of the present invention. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figure 3 , Figure 4 and Figure 5 As shown, a press mold adjustment device includes a plunger cylinder 9, a guide column 72, a nut lifting drive mechanism 12, an adjusting nut 11, a fixed seat 13, a plane bearing 14, and an upper crossbeam 1.

[0024] The lower end of the guide post 72 is fixed on the base 8, and the upper end passes through and extends out of the upper crossbeam 1. The upper crossbeam 1 and the guide post 72 are slidably engaged.

[0025] The cylinder body 902 of the plunger cylinder 9 is fixed on the fixed seat 13, and the fixed seat 13 is installed on the upper crossbeam 1. The plunger 903 of the plunger cylinder 9 is located at the upper end of the guide post 72, or it can be fixed together with the top of the guide post 72.

[0026] The adjusting nut 11 is sleeved on the outside of the guide post 72 and threadedly connected to the guide post 72. It is located above the upper crossbeam 1 and in the inner cavity 131 of the fixed seat 13. The adjusting nut 11 can be driven by the nut lifting drive mechanism 12 to rise or fall along the guide post 72.

[0027] The nut lifting drive mechanism 12 is mounted on the upper crossbeam 1. It is a relatively common mechanism. The nut lifting drive mechanism 12 used in this embodiment is shown below. Figure 3-5 It includes a motor 1202 and an intermediate transmission mechanism 1201. The motor 1202 drives each adjusting nut 11 through the intermediate transmission mechanism 1201. In this way, the four adjusting nuts 11 can be driven at the same time. Its transmission path is short and the cumulative error is small. It can maintain a high mold adjustment accuracy for a long time without frequent adjustments to ensure the mold adjustment accuracy.

[0028] The intermediate transmission mechanism 1201 can be a sprocket drive, with a drive sprocket connected to the motor output shaft and corresponding sprockets on each adjusting nut 11. The sprockets on the motor, the intermediate transmission mechanism, and the adjusting nut 11 are connected by a chain to drive the adjusting nut 11 to rotate.

[0029] The intermediate transmission mechanism can also be a gear transmission, with a drive gear connected to the motor output shaft and corresponding gears on each adjusting nut 11. The adjusting nut 11 is driven by the motor, drive gear and intermediate transmission mechanism, which will not be described in detail here.

[0030] The planar bearing 14 is installed between the adjusting nut 11 and the fixed seat 13 and is limited by the fixed seat 13. Since the adjusting nut 11 and the planar bearing 14 have rolling friction, it is convenient for the adjusting nut 11 to rotate without much rotational resistance.

[0031] The mold adjustment device also includes a pad 15, which is fitted onto the guide post 72 and placed in the groove 18 of the upper crossbeam 1 below the adjusting nut 11. The pad 15 can control the installation gap between the adjusting nut 11 and the upper crossbeam 1 by changing its thickness together with the plane bearing 14, so as to compensate for the errors caused during processing and installation.

[0032] To better ensure the operation of the press, a pressure force sensor (not shown in the figure) is also installed inside or below the pad block 15. The pressure force sensor is installed inside the upper crossbeam 1 and sleeved outside the guide column. Since the pressure force sensor is installed below the adjusting nut 11, the two are always in contact during the stamping process. Therefore, the pressure force sensor can reflect the stamping pressure of the press in real time. When the stamping pressure exceeds the set value, it will promptly send a feedback signal to the press to stop the press and play an overload protection role.

[0033] The mold adjustment device also includes an upper bearing 16 and a lower bearing 17, which are respectively installed on the upper and lower parts of the adjusting nut 11, and are respectively supported laterally by the fixed seat 13 and the upper crossbeam 1. Figure 3 and Figure 4 This prevents the adjusting nut 11 from moving radially due to uneven force, thus affecting its lifespan.

[0034] The upper crossbeam 1 is equipped with a force-applying mechanism 3, which drives the slider 6 to move up and down to complete the stamping process of the press.

[0035] Figure 3 This is a schematic diagram of the mold height adjustment device so that the press can start working after the mold height is adjusted.

[0036] When the mold height needs to be adjusted, the oil inlet chamber 901 of the plunger cylinder 9 is depressurized to the set value, which is sufficient to bear most of the weight of the upper crossbeam 1 and its mounted components. In this way, the interaction force between the adjusting nut 11 and the upper crossbeam 1 is very small. Then, the nut lifting drive mechanism 12 drives the adjusting nut 11 to rise or fall, causing the upper crossbeam 1 and the slider 6 to rise or fall synchronously with the adjusting nut 11. After reaching the set position, the nut lifting drive mechanism 12 stops working, the adjusting nut 11 is fixed, the oil inlet chamber 901 of the oil cylinder 9 is pressurized, and the upper crossbeam 1 is pressed against the lower surface of the adjusting nut 11. In this way, the mold height is adjusted. The oil inlet chamber 901 of the oil cylinder 9 is then pressurized to the set value, and the press is ready to start stamping.

Claims

1. A mold adjustment device for a press, characterized in that: The system includes a plunger cylinder, a guide column, a nut lifting drive mechanism, an adjusting nut, a fixed base, and an upper crossbeam. The lower end of the guide column is fixed to the base, and the upper end passes through and extends out of the upper crossbeam, with the upper crossbeam slidingly engaging with the guide column. The cylinder body of the plunger cylinder is fixed to the fixed base, which is mounted on the upper crossbeam, and the plunger of the plunger cylinder is positioned at the upper end of the guide column. The adjusting nut is sleeved on the outside of the guide column and threadedly connected to it. It is located above the upper crossbeam and within the fixed base. The adjusting nut rises or falls along the guide column via the nut lifting drive mechanism, which is mounted on the upper crossbeam.

2. The press mold adjustment device as described in claim 1, characterized in that: A planar bearing is provided between the top surface of the adjusting nut and the fixed seat, and the fixed seat limits the movement of the adjusting nut. The planar bearing causes rolling friction when the adjusting nut rotates.

3. The press mold adjustment device as described in claim 1, characterized in that: The mold adjustment device also includes a pad, which is fitted onto the guide post and placed in the groove of the upper crossbeam below the adjusting nut.

4. The press mold adjustment device as described in claim 3, characterized in that: A pressure force sensor is also provided inside or below the pad block. The pressure force sensor is installed inside the upper crossbeam and sleeved on the outside of the guide column.

5. The press mold adjustment device as described in claim 1, characterized in that: The mold adjustment device also includes an upper bearing and a lower bearing, which are installed on the upper and lower parts of the adjusting nut, respectively, and are supported laterally by the fixed seat and the upper crossbeam, respectively.

6. The press mold adjustment device as described in claim 1, characterized in that: The adjusting nut is placed inside the cavity of the fixed base.

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