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] The invention relates to a die adjusting device for a press machine. Background Art

[0002] Ordinary press ball head connecting rod type die height adjustment device such as Figure 1 As shown, the upper crossbeam 1 and the middle platform 71 of the base 8 are fixedly connected by bolts, the connecting rod 3 on the eccentric shaft 2 is threadedly connected with the ball screw 4, the ball head of the ball screw 4 is movably connected with the slider 6 through the spherical gland 5, and a hexagonal flat is made near the end of the ball screw 4, and the slider can be driven up and down by turning the screw with a wrench to adjust the die height of the press. This die height adjustment device has the disadvantages of complex connecting rod structure, too high requirements for the processing accuracy of parts, and easy wear of the ball head related parts. At the same time, because the distance between the two connecting rods is close, the thread error has a greater impact on the parallelism of the slider, and the die height adjustment accuracy is low.

[0003] Ordinary overhead cylinder plunger cylinder four-column press die height adjustment device such as Figure 2 As shown, the base 8, column 7, adjusting nut 11, upper crossbeam 1, plunger 10 and overhead oil cylinder 9 are connected together through a hydraulic system and threads. The upper crossbeam 1 fixes the eccentric shaft 2, and the eccentric shaft 2 is connected to the slider 6 through a connecting rod 3. The upper end of the column 7 is connected to the plunger 10 of the oil cylinder 9. The upper part of the upper crossbeam 1 fixes the oil cylinder 9, the middle part is sleeved on the column 7, and the lower part is limited by the adjusting nut 11 screwed on the column 7. When adjusting the die height, firstly, the upper cavity of the oil cylinder 9 is filled with oil to lift the upper crossbeam 1, and then the adjusting nut 11 is driven to rotate by the nut lifting and lowering driving mechanism installed on the upper crossbeam 1. When the adjusting nut 11 rises to the specified position, the lower cavity of the oil cylinder 9 is filled with oil to make the upper crossbeam 1 drop and close to the adjusting nut 11, thereby completing the die height adjustment. Compared with the ball-joint type die height adjustment device and die adjustment method for a press machine, the die adjustment device and method are externally arranged on the slider, which is conducive to the lightweight of the slider of the press machine, and the large spacing between the columns 7 is conducive to improving the precision and stability of the press machine, and also has an overload protection function, etc. However, the die adjustment device and die adjustment method also have the following disadvantages: the pressurization of the rod chamber through the overhead oil cylinder will offset the punching force of the press machine, so a larger oil pressure is required, so the cylinder diameter of the overhead oil cylinder must be relatively large, and the column must also withstand a larger tensile force; in addition, due to the insufficient rigidity of the hydraulic oil after being pressurized, it is easy to cause stamping quality problems; and because the overhead oil cylinder 9 is a double-chamber oil-inlet cylinder, the structure is complex, the processing requirements are high, the maintenance and overhaul are also relatively complex, and a relatively complex hydraulic system is required for control; because the adjusting nut is arranged below the upper crossbeam, it is limited by the slider, and the nut lifting and lowering drive mechanism can only be arranged between the two columns, resulting in a long transmission route, and the power to the four adjusting nuts will be sequential, so the cumulative error is large, and after long-term use, it needs to be readjusted, otherwise it will have a certain impact on the die height adjustment accuracy. Summary of the invention

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

[0005] The technical solution adopted by the present invention to solve the above technical problems is: A mold adjustment device for a press machine comprises a plunger cylinder, a guide column, a nut lifting drive mechanism, an adjusting nut, a fixing seat and an upper crossbeam; the lower end of the guide column is fixed on the base, and the upper end passes through and extends out of the upper crossbeam, and the upper crossbeam and the guide column are slidably matched; the cylinder body of the plunger cylinder is fixed on the fixing seat, and the fixing seat is installed on the upper crossbeam, and the plunger of the plunger cylinder is arranged on the upper end of the guide column; the adjusting nut is sleeved on the outside of the guide column and is threadedly connected with the guide column, and is located above the upper crossbeam and in the fixing seat, and the adjusting nut is driven by the nut lifting drive mechanism to rise or fall along the guide column; the nut lifting drive mechanism is installed on the upper crossbeam.

[0006] Preferably, a plane bearing is provided between the top surface of the adjusting nut and the fixing seat, and is limited by the fixing seat. The plane bearing allows rolling friction when the adjusting nut rotates, thereby reducing friction when the adjusting nut rotates, and the adjusting nut can be rotated more effortlessly.

[0007] Preferably, the mold adjusting device further comprises a cushion block, which is sleeved on the guide column and placed in a groove of the upper crossbeam below the adjusting nut.

[0008] Preferably, a compressive force sensor is further provided inside or below the cushion block, and the compressive force sensor is installed inside the upper cross beam and sleeved outside the guide column.

[0009] Preferably, the mold adjusting device further comprises an upper bearing and a lower bearing, which are respectively mounted on the upper and lower parts of the adjusting nut and are respectively supported laterally by a fixing seat and an upper cross beam, thereby preventing the adjusting nut from radially moving due to uneven force and thus affecting the life of the adjusting nut.

[0010] Preferably, the adjusting nut is placed in the inner cavity of the fixing seat, so that dust or other impurities in the environment are not easy to enter the adjusting nut.

[0011] Compared with the prior art, the advantages of the present invention are: 1. Since the plunger cylinder and the adjusting nut are arranged on the upper part of the upper crossbeam, the force conditions of the plunger cylinder and the adjusting nut are changed. The plunger cylinder does not need to match the punching force of the press, and a smaller cylinder diameter can be used, which reduces the flow and oil pressure and avoids leakage and other common problems of the oil cylinder under high pressure.

[0012] 2. The adjusting nut is arranged on the upper part of the upper beam, and the nut lifting and lowering driving mechanism can be arranged in the middle part of the upper beam. The transmission route is short, four nuts can be transmitted at the same time, the cumulative error is small, and the press is simpler and more compact.

[0013] 3. The single-chamber oil-inlet plunger cylinder has a simple structure, greatly reduced machining accuracy requirements, greatly reduced machining surfaces, and easy maintenance and overhaul.

[0014] 4. Also, because the fixed seat, plane bearing, adjusting nut and the upper part of the upper beam are always in a rigid contact state 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, making the mold adjustment more accurate, thereby ensuring the stamping accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front structural schematic diagram of an existing ball-head connecting rod type die height adjustment press.

[0016] Figure 2 It is a front structural schematic diagram of an existing overhead plunger cylinder press.

[0017] Figure 3 It is a front structural schematic diagram of a mold adjusting device for a press machine according to an embodiment of the present invention.

[0018] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0019] Figure 5 The present invention is a schematic structural diagram of an adjusting nut and a nut lifting and lowering driving mechanism of a die adjusting device for a press machine according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 3 , Figure 4 and Figure 5 As shown, a die adjustment device for a press machine includes a plunger cylinder 9, a guide column 72, a nut lifting drive mechanism 12, an adjusting nut 11, a fixing seat 13, a plane bearing 14 and an upper crossbeam 1.

[0022] The lower end of the guide column 72 is fixed on the base 8 , and the upper end passes through and extends out of the upper cross beam 1 , and the upper cross beam 1 is slidably matched with the guide column 72 .

[0023] The cylinder body 902 of the plunger cylinder 9 is fixed on the fixing seat 13 , and the fixing seat 13 is installed on the upper crossbeam 1 . The plunger 903 of the plunger cylinder 9 is arranged at the upper end of the guide column 72 , and can also be fixed together with the top of the guide column 72 .

[0024] The adjusting nut 11 is inserted into the guide column 72 and is threadedly connected to the guide column 72 . The adjusting nut 11 is located above the upper beam 1 and in the inner cavity 131 of the fixing seat 13 . The adjusting nut 11 can be driven by the nut lifting drive mechanism 12 to rise or fall along the guide column 72 .

[0025] The nut lifting drive mechanism 12 is installed on the upper crossbeam 1, which is a relatively common mechanism. The nut lifting drive mechanism 12 used in this embodiment is shown in FIG. 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, so that the four adjusting nuts 11 can be driven at the same time, the transmission route is short, the cumulative error is small, and a high mold adjustment accuracy can be maintained for a long time without frequent adjustments to ensure the mold adjustment accuracy.

[0026] The intermediate transmission mechanism 1201 can be a sprocket drive, with a driving sprocket connected to the motor output shaft, and corresponding sprockets are set on each adjusting nut 11. The sprocket on the motor, the sprocket of the intermediate transmission mechanism and the sprocket of the adjusting nut 11 are connected by a chain to drive the adjusting nut 11 to rotate.

[0027] The intermediate transmission mechanism can also be a gear transmission, with a driving gear connected to the motor output shaft, and corresponding gears set on each adjusting nut 11. The adjusting nut 11 is driven by the motor, the driving gear and the intermediate transmission mechanism, which will not be described here.

[0028] The plane bearing 14 is installed between the adjusting nut 11 and the fixing seat 13 and is limited by the fixing seat 13. Since there is rolling friction between the adjusting nut 11 and the plane bearing 14, it is convenient for the adjusting nut 11 to rotate without too much rotation resistance.

[0029] The mold adjustment device also includes a cushion block 15, which is sleeved on the guide column 72 and placed in the groove 18 of the upper beam 1 below the adjusting nut 11. The cushion block 15 can control the installation gap between the adjusting nut 11 and the upper beam 1 by changing its thickness together with the plane bearing 14, so that it can compensate for the errors caused by processing and installation.

[0030] In order to better ensure the operation of the press, a compressive force sensor (not shown in the figure) is also arranged inside or below the cushion block 15. The compressive force sensor is installed in the upper cross beam 1 and is inserted into the outside of the guide column. Since the compressive force sensor is installed below the adjusting nut 11, the two are always in contact during stamping, so the compressive force sensor can reflect the stamping force of the press in real time. When the stamping force exceeds the set value, the signal will be fed back to the press in time to stop the press and play an overload protection role.

[0031] The mold adjustment device further comprises an upper bearing 16 and a lower bearing 17, which are respectively mounted on the upper and lower parts of the adjustment nut 11 and are respectively supported laterally by the fixing seat 13 and supported by the upper crossbeam 1. Figure 3 and Figure 4 This can prevent the adjusting nut 11 from moving radially due to uneven force, thereby affecting the life of the adjusting nut 11.

[0032] The upper cross beam 1 is provided with a force applying mechanism 3, which drives the slide block 6 to move up and down to complete the stamping process of the press.

[0033] Figure 3 This is a schematic diagram of the structure of the die height adjustment device when the die height is adjusted and the press can start working.

[0034] When the die height needs to be adjusted, the oil inlet chamber 901 of the plunger cylinder 9 is depressurized to a set value, which is sufficient to bear most of the deadweight of the upper beam 1 and the components mounted thereon, so that the interaction force between the adjusting nut 11 and the upper beam 1 is very small, and then the nut lifting drive mechanism 12 drives the adjusting nut 11 to rise or fall, driving the upper beam 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 beam 1 is close to the lower surface of the adjusting nut 11. In this way, the die height adjustment is completed, and the oil inlet chamber 901 of the oil cylinder 9 is pressurized to the set value again, and the press is ready to start stamping.

Claims

1. A mold adjustment device for a press machine, characterized in that: It includes a plunger cylinder, a guide column, a nut lifting drive mechanism, an adjusting nut, a fixing seat and an upper crossbeam; the lower end of the guide column is fixed on the base, and the upper end passes through and extends out of the upper crossbeam, and the upper crossbeam and the guide column are slidably matched; the cylinder body of the plunger cylinder is fixed on the fixing seat, and the fixing seat is installed on the upper crossbeam, and the plunger of the plunger cylinder is arranged on the upper end of the guide column; the adjusting nut is sleeved outside the guide column and is threadedly connected with the guide column, and is located above the upper crossbeam and in the fixing seat, and the adjusting nut is driven by the nut lifting drive mechanism to rise or fall along the guide column; the nut lifting drive mechanism is installed on the upper crossbeam.

2. The mold adjusting device for a press machine according to claim 1, characterized in that: A plane bearing is arranged between the top surface of the adjusting nut and the fixing seat, and is limited by the fixing seat, so that rolling friction occurs when the adjusting nut rotates through the plane bearing.

3. The mold adjusting device for a press machine according to claim 1, characterized in that: The mold adjusting device also includes a cushion block, which is sleeved on the guide column and placed in a groove of the upper crossbeam below the adjusting nut.

4. The mold adjusting device for a press machine according to claim 3, characterized in that: A compressive force sensor is also arranged inside or below the cushion block. The compressive force sensor is installed inside the upper cross beam and is sleeved outside the guide column.

5. The mold adjusting device for a press machine according to claim 1, characterized in that: The mold adjusting device also includes an upper bearing and a lower bearing, which are respectively mounted on the upper part and the lower part of the adjusting nut and are respectively supported laterally by the fixing seat and the upper crossbeam.

6. The mold adjusting device for a press machine according to claim 1, characterized in that: The adjusting nut is placed in the inner cavity of the fixing seat.

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