Screw press

FIELD: process engineering.

SUBSTANCE: invention relates to machine building, particularly to screw presses. Proposed press comprises foundation with rectilinear guides accommodating slide reciprocating and oscillating therein. For this there is a screw pair consisting of screw and nut. Screw is arranged to move forward and back and is coupled with turn drive. Nut is arranged to be driven by rotation drive.

EFFECT: higher efficiency.

6 cl, 10 dwg

 

The invention relates to forging machinery, namely, screw presses.

Known screw press comprising a frame fixedly installed on the frame nut, a slide mounted in the frame for rectilinear guides, and screw one end pivotally connected with the slide, the other end associated with the flywheel and drive [1].

The press has insufficient functionality for deformation, does not provide the effect of pulsating loads in a sequence of strokes (pulses).

Known screw press [2], comprising a frame; a slide mounted in the frame for rectilinear guides; screw, one end through a swivel associated with the slide, the other through a spline engagement is associated with worm gear; a nut mounted in the frame can be rotated around the axis in the forward and reverse direction from the crank-rocker drive.

Screw press has a low efficiency due to significant energy losses.

Energy loss due to the fact that the deforming movement of the RAM is carried out mainly by the movement of the nut. Friction in the hinge nuts are on a large radius, define the great moment of resistance and a significant loss of energy.

Energy loss is also due to the fact that the od of the deformation is carried out while moving the screw and nut. When this takes work to overcome friction in the hinge screws and hinge nuts.

Energy loss is also due to the fact that the rotation of the screw relative to the slider is provided with drive mounted on the frame. Thus rotation of the screw is transmitted through the spline connection, which takes the load deformation and in which there is significant axial displacement of the contact surfaces with the loss of energy to friction.

Energy loss is also due to the fact that at a considerable height mechanism presses the base rails of the slide has a small value. A considerable force of pressure in the guide, is inversely proportional to their base, defines a large friction force and friction losses.

The objective of the invention is to increase the efficiency of the press.

To solve the problem in a screw press, a frame containing linear guides, which include a slide with possibility of simultaneous translational and vibrational movements for progressive implementation of the strokes, screw a couple in the form of a screw and nut actuator rotation in forward and reverse directions and a rotational drive, in accordance with the invention, the set screw can be rotated in forward and backward directions and is associated with upon is driven by rotation, and nut mounted for rotation and connected with the rotation drive.

Nut and rotation drive installed in the frame, and the screw and the drive rotation in forward and reverse directions in the slide, with nut and screw fixed in the axial direction, and the aforementioned drives - still.

Nut and rotation drive installed in the slide, and a screw and actuator rotation in forward and reverse directions in the frame, with nut and screw fixed in the axial direction, and the aforementioned drives - still.

Screw, drive rotation in forward and reverse directions and the rotational drive is installed in the frame, the screw is installed stationary in the axial direction, and the nut is installed in the slide stationary in the axial direction and connected with the rotation drive means vertically installed in the frame of the pinion with the crown, the width of which exceeds the stroke of the RAM, and located in engagement with a pinion gear mounted on the nut.

The nut is made with a support flange having an annular surface for the perception of the technological burden, made with an average radius R, which is defined by the formula:

,

where: Σ is the total moment of the driving forces acting on the nut;

R - technological power;

f - coefficient of friction on poverhnostnogo flange

while the mounting flange is made with a friction lining or friction surface, and the rotation drive made electric with slip clutch or pneumatic, or hydraulic.

The bed is made in the form of a base plate and bottom plate of the stamp, the United racks in the form of a tie rod, and the slide made in the form of a top plate punch and plate nut, United columns in the form of tie rods, and the bottom plate punch and plate nuts are made with the guide holes in which are located, respectively, pillars and columns.

Figure 1 shows a case where the press device according to claim 1 and claim 2.

Figure 2 shows the structural-functional graph is a variant of the device of the press.

Figure 3 shows a case where the press device according to claim 1 and item 3.

Figure 4 shows the structural-functional graph is a variant of the device of the press.

Figure 5 shows a case where the press device according to claim 1 and claim 4.

Figure 6 shows the structural-functional graph is a variant of the device of the press.

Figure 7 shows the graph of the movement of the slide for device variants press on paragraphs 1 and 2 1 and 3 1 and 4.

On Fig shows a case where the press device according to claim 1 and claim 5.

Figure 9 shows a graph of the movement of the slide for option devices press on items 1 and 5.

Figure 10 shows a variant of the press device according to claim 1 and 6.

Option 1 device is and the press according to claim 1 and claim 2 (see 1) includes interconnected: a frame 1, a slider 2, a screw 3, the nut 4, the actuator rotation in forward and reverse direction 5 and the rotation drive 6. The slider 2 is installed in the frame 1 on rectilinear guides. The screw 3 is mounted on the slide 2 is stationary in the axial direction and with the possibility of forward and reverse rotation of the actuator 5, permanently installed in the slide 2. Nut 4 is installed in the frame 1 is stationary in the axial direction and rotatably from the actuator 6 is fixedly mounted in the frame 1.

The structure of the press for option 1 (see figure 2) is represented by the elements 1, 2, 3, 4, 5, 6 - accordingly, the frame, slide, screw, nut, actuator rotation in forward and reverse direction and a rotational drive. General function press the PDP is a rectilinear movement of the slide 2 relative to the base 1 in the form of simultaneous translational and oscillatory movements. The function of the PDP is provided with functions relative displacements: the cap is rotated in forward and reverse direction of the screw 3 relative to the slider 2; GRP - rotation nut 4 against the frame 1; VIP - helical movement of the screw relative to the nut; NK - fixed mounting of the actuator 5 on the slider 2 and the fixed mounting of the actuator 6 on the frame 1.

Option 2 press device according to claim 1 and 3 (see figure 3) includes interconnected: frames is 1, the slider 2, a screw 3, the nut 4, the actuator rotation in forward and reverse direction 5 and the rotation drive 6. The slider 2 is installed in the frame 1 on rectilinear guides. The screw 3 is mounted on the frame 1 is stationary in the axial direction and can be rotated in forward and reverse directions from the actuator 5, permanently installed in the frame 1. Nut 4 is installed on the slider 2 is stationary in the axial direction and rotatably from the actuator 6 fixedly mounted on the slide 2.

The structure of the press for option 2 (see figure 4) is represented by the elements 1, 2, 3, 4, 5, 6 - accordingly, the frame, slide, screw, nut, actuator rotation in forward and reverse directions and a rotational drive. General function press the PDP is a rectilinear movement of the slide 2 relative to the base 1 in the form of simultaneous translational and oscillatory movements. General function is provided by the functions relative displacements: the cap is rotated in forward and backward directions of the screw 3 against the frame 1; GRP - rotation relative to the nut 4 of the slide 2; VIP - helical movement of the screw relative to the nut; NK - fixed mounting of the actuator 5 on the frame 1 and fixed by the fastening of the actuator 6 on the slide 2.

Option 3 press device according to claim 1 and claim 4 (see figure 5) includes interconnected: a frame 1, a slider 2, a screw 3, the nut 4, PR the waters of rotation in forward and reverse directions 5 and the rotation drive 6. The slider 2 is installed in the frame 1 on rectilinear guides. The screw 3 is installed in the frame 1 is stationary in the axial direction and can be rotated in forward and reverse directions from the actuator 5, permanently installed in the frame 1. Nut 4 is installed on the slider 2 is stationary in the axial direction and rotatably from the actuator 6 fixedly mounted on the frame 2. Rotation of the actuator 6 to the nut 4 is transmitted through the gear 7 with the width of the crown more stroke of the RAM installed on the frame 1 for rotation and fixed in the axial direction. Gear 7 is in mesh with the toothed wheel 8 is fixedly mounted on the nut 4.

The structure of the press for option 3 (see Fig.6) is represented by the elements 1, 2, 3, 4, 5, 6, 7, 8 - accordingly, the frame, slide, screw, nut, actuator rotation in forward and reverse directions, a rotational drive, the gear and the toothed wheel. General function press the PDP is a rectilinear movement of the slide 2 relative to the base 1 in the form of simultaneous translational and oscillatory movements. The function of the PDP is provided with functions relative displacements: the cap is rotated in forward and backward directions of the screw 3 against the frame 1; GRP - rotation relative to the nut 4 of the slide 2; VIP - helical movement of the screw relative to the nut; NK-fixed mounting of the actuator 5 and the actuator 6 on the frame 1; VIP - helical movement of gears and wheels relative to each other.

The press according to the above variants of the design is characterized by the movement of the slide (see Fig.7), which displayed the schedule of the "n" in the coordinates of the stroke of the slide N ' time, So the Move "n" due to the simultaneous move "in" turn in forward and backward directions of the screw 3 relative to the slider 2 (or against the frame 1 for option 1 press design) and the rotational displacement "d" of the nut relative to the frame 1 (or relative to the slide 2). Thus the cycle time of deformation of the Shopping center consists of time deformation TD and idling time DH. During deformation TD slider does move (high strain) Nd. The stroke of the RAM during deformation (part of the schedule "n" between the lines cut AP) is carried out while moving the screw (on the graph "b") and the simultaneous movement of the nut (on the graph "g").

Options press design on items 1-4 is provided a process of deformation of the slide to a greater extent due to the turn of the screw, than by turning the nut. As the radius of the friction surfaces of the screw is smaller than the corresponding radius of the friction surfaces of the nut, the proposed design options have less friction loss and great efficiency in comparison with FR is the type.

In addition, modifications of the design of the press are excluded, the axial displacement of the contact surfaces of the screw and the actuator and its associated friction losses, which also provides higher efficiency media compared to the prototype.

Option 4 press device according to claim 1 and claim 5 (see Fig) includes interconnected: a frame 1, a slider 2, a screw 3, the nut 4, the drive rotation of the screw in the forward and reverse directions (Fig not shown) and the actuator 6, the rotation of the nut. The actuator 6 is made of electric and equipped with a friction slip clutch 9. The nut 4 has a bearing flange 10 with the annular surface mean radius R. the working surface of the support flange to increase the coefficient of friction is friction coating or friction pad. The supporting flange of the applied force deformation of the semifinished product P. the Average radius R is made such that satisfies the condition:

,

where: R is the average radius of the support flange;

Σ is the total moment of the driving forces acting on the nut;

R - technological power;

f - coefficient of friction on the supporting surface.

Instead of the electric motor with slip clutch may apply newmanator or hydraulic motor.

The press on this option differs in that the onset of deformation at the turn of the screw 3 from the drive of the turn of the screw (on IG not shown), and the rotation of the nut 4 from the actuator 6 to the mounting flange 10 nuts 4 starts to operate technological power P. This force on the operating radius R creates a moment of force of friction that exceeds the amount of drive torque from the actuator 6 and the driving friction torque from the screw 3. This point locks the nut from rotating and holds it stationary until the end of the direct rotation of the screw and the beginning of the reverse rotation. At the beginning of the reverse rotation of the screw 3 can be unloaded to the support flange 10 nut 4 from technological forces R. Exempt nut 4 is driven into rotation from the actuator 6. Turning the nut 4 is opposite in direction to the rotation of the screw 3, the result of the addition of the displacements of the screw and the nut, the slide 2 work out the approximate moving the stand.

The press is characterized by the movement of the slide (see Fig.9), which displayed the schedule of the "n" in the coordinates of the stroke of the slide N ' time, So the Move "n" is due to the movement of the screw in from the actuator rotation in forward and reverse directions and the rotational movement of nut "g" relative to the slider. Thus the cycle time of deformation of the Shopping center consists of the time of deformation of the TD and the time of dwell TV. During deformation TD slider does move (high strain) Nd. The stroke of the RAM during deformation (part of the schedule "n" between the lines cut AP) carried the fast moving screw (schedule "b") and a fixed nut (intermittent schedule "g").

Press on items 1, 5 performs a working stroke of deformation with a stationary nut. Since the contact surface of the hinge nuts are not displaced relative to each other, they have no losses to friction. This ensures the achievement of the task, is considered, the press has a higher efficiency in comparison with the prototype.

Option 5 press device according to claim 1 and claim 6 (see figure 10) includes a frame 1, a slider 2, a screw 3, the nut 4, the drive screw 5 and the drive nut B. A bed of the press consists of a base plate 11, the racks 12 in the form of tie rods and plates of the lower punch 13. The press slide consists of a plate of the upper punch 14, columns 15 in the form of tie rods and plate nuts 16. In the plate lower punch 13 holes with the guide sleeve covering the column 15. In the plate nut 16 holes with the guide sleeve covering the rack 12. The holes in the plates 13, 16 of the rack 12 and the column 15 are the guiding elements of design, providing rectilinear movement of the slide against the frame. Base rails equal to the distance between the holes of the plate 13 and plate 16. At the end of deformation of the base rails In has a greater value, comparable with long screws. When the action on the slide perekachivayuschih moment M in the guide occurs the pressure force N, which is determined by the expression:

.

At the same time, the larger base of the guides, the less the pressure is N. since the friction losses in the guide is directly proportional to the force of pressure N, increasing the base rails reduces these losses.

Thus, the proposed option press design with an enlarged base rails allows for less friction losses and greater efficiency in comparison with the prototype.

Sources of information

1. The Zhivov LI, Ovchinnikov A.G., Skladchikov E.N. Forging and stamping equipment: Textbook for high schools / Under. Ed. Liivoja. - M.: Izd-vo MGTU im. Bauman, 2006, s-338.

2. USSR author's certificate No. 1276520, CL VV 1/18, 15.12.86.

1. Screw press, a frame containing linear guides, which include a slide with possibility of simultaneous translational and vibrational movements for progressive implementation of the strokes, screw a couple in the form of a screw and nut actuator rotation in forward and reverse directions and a rotational drive, characterized in that the set screw can be rotated in forward and reverse directions and connected with the said actuator rotation, and the nut mounted for rotation and connected with the rotation drive.

2. The press according to claim 1, characterized in that the nut and the rotation drive installed in the frame, and the screw and the drive rotation in forward and reverse is upravleniya - in the slide, with nut and screw fixed in the axial direction, and the aforementioned drives - still.

3. The press according to claim 1, characterized in that the nut and the rotation drive installed in the slide, and a screw and actuator rotation in forward and reverse directions in the frame, with nut and screw fixed in the axial direction, and the aforementioned drives - still.

4. The press according to claim 1, characterized in that the screw actuator rotation in forward and reverse directions and the rotational drive is installed in the frame, the screw is installed stationary in the axial direction, and the nut is installed in the slide stationary in the axial direction and connected with the rotation drive means vertically installed in the frame of the pinion with the crown, the width of which exceeds the stroke of the RAM, and located in engagement with a pinion gear mounted on the nut.

5. The press according to claim 1, characterized in that the nut is made with a support flange having an annular surface for the perception of the technological burden, made with an average radius R, which is defined by the formula
,
where Σ is the total moment of the driving forces acting on the nut;
R - technological power;
f - coefficient of friction on the surface of the support flange, while the mounting flange is made with a friction lining or frictio the th floor, and the rotation drive made electric with slip clutch, or pneumatic, or hydraulic.

6. The press according to claim 1, characterized in that the bed is made in the form of a base plate and bottom plate of the stamp, the United racks in the form of a tie rod, and the slide made in the form of a top plate punch and plate nut, United columns in the form of tie rods, and the bottom plate punch and plate nuts are made with the guide holes, which are respectively the column and the rack.



 

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