JPS6333949Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an inlet tube lifting prevention device for a press hardening machine that hardens a workpiece while pressurizing it.

Conventionally, in this type of quenching apparatus, an inlet pipe that guides a large amount of oil stored in an accumulator to a workpiece is artificially connected during quenching. However, this method is not only inefficient but also dangerous, so a device that automatically connects the wires has been proposed. In this device, the inlet pipe is pressed by a cylinder and connected to the outer slide, but when hydraulic pressure flows into the chamber that houses the outer slide, the inlet pipe receives back pressure and floats up, making the connection unstable. There was a problem.

This idea was made to improve this problem, and by changing the pressing force of the upper and lower cylinders that urge the lower introduction pipe in accordance with the pressure inside the chamber, the back pressure acting on the lower introduction pipe is offset. The present invention provides a device for preventing floating of an inlet pipe of a press hardening machine, thereby making it possible to stably supply oil to a workpiece.

An embodiment of this invention will be described below in detail with reference to the drawings. In the drawing, 1 is the main body of the press hardening apparatus, which has a gate-shaped main frame 1a, and a longitudinal direction An upper slide cylinder 3 is installed in the upper slide cylinder 3. The center part of the Atsupaslide 2 is connected to the tip of a piston rod 3a that projects downward from the upper slide cylinder 3, and the Atsupaslide 2 is moved up and down by the upper slide cylinder 3, and the An outer slide 4 and an inner slide 5 are housed within the pass slide 2. The outer slide 4 is pressurized by a pressure cylinder 6 attached to the top plate 2a' of the Atsupaslide 2, and the inner slide 5 is pressurized by a pressure cylinder 7. An outer jig 17 for pressurizing a workpiece A between die slides 21 to be described later is attached to the lower surface, and an inner jig 18 is attached to the lower surface of the inner slide 5.

Further, an annular lower relay tank 2a is provided at the upper part of the Atsupaslide 2, and the lower end of the upper introduction pipe 8 is connected to this lower relay tank 2a. The upper end side of the upper introduction pipe 8 protrudes toward the upper relay tank 9 side provided at the upper part of the main frame 1a, and is guided for vertical movement by guide parts 9a and 9b provided at the upper and lower parts of the upper relay tank 9. And liquid tightness is maintained. The upper relay tank 9 is connected to an accumulator (not shown) through a pipe line 10, and after oil supplied from the accumulator flows into the upper relay tank 9, it is introduced into the upper part through an inlet 8a opened in the upper introduction pipe 8. It is designed to flow into the lower relay tank 2a of the Atspa Slide 2 via the pipe 8.

On the other hand, there is a seat valve 1 in the lower relay tank 2a.
1 is provided. This seat valve 11 has a valve body 11a accommodated in the upper part of a plurality of lower introduction pipes 13 which are vertically movable by a vertical cylinder 12. The valve body 11a is pressed against the valve seat 11c by a compression spring 11b, and has an introduction port 13a opening into the lower relay tank 2a and a lower introduction pipe 13.
The valve body 11a is attached to the tip of the piston rod 14a of the opening/closing cylinder 14 provided in the upper end of the lower introduction pipe 13, and is connected to the rod side of the opening/closing cylinder 14 by the hydraulic power source 1.
5, the valve body 11a can be opened by supplying hydraulic pressure through the electromagnetic valve 16.
Further, a connection port 13c with an oblique connection surface 13b is provided at the lower end of the lower introduction pipe 13, and is provided on the outer peripheral surface of the outer jig 17 by lowering the lower introduction pipe 13 using the upper and lower cylinders 12. It can be connected liquid-tightly to the oil receiving port 17a. The outer jig 17 has a hollow annular shape and has a pressure surface 17b having the same slope as the inner jig 18 provided inside.
A number of oil injection holes 17c communicating with the inside of the outer jig 17 are opened in b, and the oil in the outer jig 17 is spouted toward the workpiece A from these oil injection holes 17c. .

On the other hand, at the bottom of the main body 1 is a die slide 21 that can be slid horizontally by a slide cylinder 20.
is provided. The die slide 21 is supported by a pair of guide rods 22 and is moved along these guide rods 22, and a centering jig 23 is provided at the upper center of the die slide 21. The centering jig 23 is a centering segment 23 that comes into contact with the inner circumferential surface of the workpiece A to be hardened to restrict deformation of the inner circumference of the workpiece A.
a, a female taper member 23b located at the center of the centering segment 23a, a male taper member 23c fitted from above to the center of the female taper member 23b, and a center portion of the male taper member 23c. It consists of a penetrating center pin 23d,
A centering cylinder 24 is provided above the center pin 23d. The centering cylinder 24 is attached to the tip of a piston rod 25a of a pressure cylinder 25 attached to the center of the Atsupaslide 2, and is moved up and down by the pressure cylinder 25. comes into contact with the upper surface of the male tapered member 23c and can press it downward. Note that of the centering jig 23, only the centering segment 23a is replaced according to the workpiece A, and the other parts are common parts.

On the other hand, an introduction pipe 30 into which oil discharged from a hydraulic pump (not shown) flows is installed below the die slide 21, and the upper opening of the introduction pipe 30 is an inflow port opened at the lower part of the die slide 21. 21a in a liquid-tight manner,
The oil flowing into the die slide 21 from the introduction pipe 30 is ejected from the passage 21b in the die slide 21 into the chamber 31 through an outflow hole 21c opened on the upper surface of the die slide 21 on the peripheral side. The upper end of the chamber 31 is fixed to the lower surface of the upper slide 2, and the lower end of the chamber 31 is fitted into an annular groove 21d formed on the upper surface of the peripheral portion of the die slide 21. A packing 32 is accommodated in the annular groove 21d, and this packing 32
By pressing the lower end of the chamber 31 into
The fluid tightness between the chamber 31 and the die slide 21 is maintained, and the oil flowing into the chamber 31 passes through the tooth groove a of the workpiece A to the inner jig 18.
It is starting to flow inward. Inner jig 1
The oil flowing into the inner slide 8 further flows into the Atsupaslide 2 from inside the inner slide 5, and is discharged from a discharge pipe 34 connected to the circumferential surface of the Atsupaslide 2 to a tank (not shown). .

Note that 35 in the figure is a locking mechanism that locks the upper slide 2 in the lowered position. Further, 36 is a hydraulic pump that supplies hydraulic pressure to the upper and lower cylinders 12 via a pressure reducing valve 37, and the pressure reducing valve 37 adjusts the pressure supplied from the hydraulic pump 36 to the upper and lower cylinders 12 according to the pressure inside the chamber 31. It's summery.

Next, to explain the action during hardening, the die slide 21 is carried out of the main body 1 along the guide rod 22 by the slide cylinder 20, and the work A, such as a bevel gear, heated to the hardening temperature outside the main body 1 is centered. A part of the jig 23 is used to fix it onto the die slide 21, and the outer jig 17 and inner jig 18 attached to the outer slide 4 and inner slide 5 are also replaced with ones that match the workpiece A.

Next, after the die slide 21 is carried into the main body 1 by the slide cylinder 20, the upper slide cylinder 3 lowers the upper slide 2, and the devices attached to the upper slide 2 side also lower together with the upper slide 2. The lower end of the chamber 31 enters the annular groove 21d on the die slide 21, and liquid-tightness is ensured by the packing 32 in the annular groove 21d. At the same time, the connection port 13c at the lower end of the lower introduction pipe 13 is automatically connected to the oil receiving port 17a of the outer jig 17, and the lower relay tank 2a at the top of the upper slide 2 and the inside of the outer jig 17 are connected via the seat valve 11 and the lower introduction pipe 13.
At the same time, the piston rod 24a of the centering cylinder 24 provided at the center of the upper slide 2
The male taper member 23c of the centering jig 23
By applying pressure from above, the female taper member 23
The centering segment 23a is pressed against the inner peripheral surface of the workpiece A via the outer slide 4 and the inner slide 5, thereby centering the workpiece A and preventing deformation inward, and the outer jig 17 attached to the outer slide 4 and the inner jig 18 attached to the inner slide 5 pressurize the tooth surface of the workpiece A from above. In this state, a large amount of high-pressure oil is supplied from an accumulator (not shown) through a pipeline 10 into the upper relay tank 9, and oil is also supplied from a hydraulic pump (not shown) to the introduction pipe 30. The oil supplied into the upper relay tank 9 flows into the upper introduction pipe 8 from the inlet 8a of the upper introduction pipe 8.
At this time, a detector 39 such as a pressure switch provided in the pipeline 10 detects the inflow of hydraulic pressure from the accumulator and opens the solenoid valve 16.
The hydraulic pressure from the cylinder 15 is supplied to the rod side of the opening/closing cylinder 14 to open the valve body 11a of the seat valve 11. As a result, a large amount of oil flowing into the lower relay tank 2a flows into the outer jig 17 through the lower introduction pipe 13, and the pressure surface 1 of the outer jig 17 is pressed against the valve body 11a.
At the same time, oil from the hydraulic pump is also injected into the passage 21b in the die slide 21 and the outlet hole 2
1c into the chamber 31, and as it passes through the tooth groove a of the workpiece A, it is mixed with the oil ejected from the ejection hole 17c to cool the workpiece A. At the same time, the oil that has reached the inner jig 18 rises inside the inner slide 5 as shown by the arrow, and is discharged outside the upper slide 2 through the discharge pipe 34 provided on the outer circumferential surface of the upper slide 2.

On the other hand, when the pressure inside the chamber 31 increases due to the oil flowing into the chamber 31, a force that tries to push the lower introduction pipe 13 up is exerted by this pressure. However, as the pressure inside the chamber 31 increases, the pressure reducing valve 37
As the reduced pressure decreases, the hydraulic pressure supplied to the bottom side of the upper and lower cylinders 12 increases in proportion to the pressure inside the chamber 31, and the connection port 13c of the lower introduction pipe 13 increases.
The pressing force at is maintained substantially constant regardless of pressure fluctuations within the chamber 31. As a result, even if the outer slide 4 and the inner slide 5 perform a pulsing operation that repeatedly pressurizes and pressurizes during quenching of the workpiece A, the lower introduction pipe 13
This can prevent the work A from being pressurized above a certain value.

As described in detail above, this device biases the lower introduction pipe that guides oil from the accumulator into the outer slide using upper and lower cylinders that change the pressing force depending on the pressure inside the chamber that houses the outer slide. By canceling out the back pressure acting on the lower introduction pipe, the connection between the lower introduction pipe and the outer slide can be established reliably regardless of pressure fluctuations within the chamber, and pressurization can be stopped during pulsing operation. Even if the workpiece is hardened, the pressure applied to the workpiece through the lower introduction pipe can be maintained below a certain value, so there is no risk of adversely affecting the workpiece during hardening.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of this invention. 1 is the main body, 2 is the Atsupaslide, 2a is the lower relay tank, 4 is the outer slide, 5 is the inner slide, 6 and 7 are the pressure cylinders, 8 is the upper introduction pipe,
12 is an upper and lower cylinder, 13 is a lower introduction pipe, 17 is an outer jig, 17a is an oil receiving port, 21 is a die slide, 31 is a chamber, and A is a workpiece.

Claims (1)

[Scope of utility model registration request] Die slide 21 that can be moved in and out of the main body 1
An Atsupaslide 2 surrounded by a chamber 31 is provided above the Atsupaslide 2.
An outer slide 4 and an inner slide 5 are provided inside which are pressurized by pressure cylinders 6 and 7, and an outer jig 17 and an inner jig 18 attached to these slides 4 and 5 are used to press the workpiece A on the die slide 21. In a device that performs quenching while pressing, a lower relay tank 2a into which oil is introduced from an accumulator through an upper introduction pipe 8 to the Atsupaslide 2 is provided.
A lower introduction pipe 13 for guiding the oil in the lower relay tank 2a to the oil receiving port 17a of the outer jig 17 is provided in the lower relay tank 2a so as to be movable up and down by the upper and lower cylinders 12. The cylinder 12 is supplied with hydraulic pressure via a pressure reducing valve 37 that changes the reduced pressure according to the pressure within the chamber 31, thereby canceling out the back pressure acting on the lower introduction pipe 13 within the chamber 31. A device to prevent lifting of the inlet pipe of the quenching equipment.