JPS62173062A - Spraying method for injection sleeve - Google Patents

Abstract

PURPOSE:To improve the quality of a product by forming a nozzle for spraying a spraying agent radially in the radial direction of an injection sleeve by sliding in said sleeve in the longitudinal direction thereof in such a manner that the amt. of the spraying agent to be sprayed by said nozzle can be varied according to nozzle positions. CONSTITUTION:A piston rod 31 of a cylinder 30 is advanced to move a driving cylinder 32 to the position concentrical with an injection sleeve 19 and thereafter pumps 36, 45 are started; at the same time a controller 50 commands a stop valve to open and solenoids 43, 44 to repeat energization and de-energization alternately at prescribed timings. A pressure oil is thereby alternately fed to the head end side and rod end side of the driving cylinder 32 so that a nozzle device 39 repeats rise and fall and injects a spraying liquid 41 from the nozzle 40, thereby coating the liquid 41 to the inside surface of the sleeve 19.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of spraying an injection sleeve in a die-casting machine, in which a spray agent such as a lubricant is sprayed from a nozzle onto the inner surface of the injection sleeve.

[Conventional technology]

A die casting machine is equipped with a mold and a casting sleeve that is removably joined to a fixed sleeve of the mold, and the molten metal is supplied to the injection sleeve that is joined to the fixed sleeve.
The molten metal is injected into the mold cavity through a fixed sleeve and a gate, and the molten metal is solidified and cooled to obtain a cast product.

In casting operations using such die casting machines, a lubricant is applied to lubricate the inner surface of the injection sleeve and to create a boundary layer between the molten metal and the inner surface of the sleeve. Conventionally, this lubricant was applied by seven workers by inserting a lubricant-soaked cloth into the injection sleeve, resulting in uneven and insufficient lubrication and requiring a great deal of labor.

Therefore, the present applicant has proposed and patented a method and apparatus for lubricating an injection sleeve as shown in, for example, Japanese Patent Publication No. 51-25409. This lubrication method includes a lubrication device having a nozzle at its tip.

The nozzle of this lubricating device is inserted between the opened fixed and movable molds, and the nozzle is reciprocated in the axial direction within the injection sleeve by a drive device consisting of a rack and pinion, etc., and the lubricant is ejected from the nozzle. It provides lubrication.

[Problem that the invention seeks to solve]

With this configuration, the injection sleeve can be easily and efficiently lubricated.

Although conventional lubrication methods and devices are effective when applied to a horizontal injection sleeve, they are not effective when applied to a vertical injection sleeve with the open end facing upward. The spray liquid sprayed at the top may drip down and collect at the bottom, resulting in a large amount of coating at the bottom and not being applied evenly, or the spray liquid that drips and collects at the bottom may come into contact with the molten metal, vaporize, and turn into molten metal. However, it is not possible to expect a satisfactory effect because the product may be contaminated and the quality of the product may be deteriorated.

[Means for solving the problem] The present invention was developed as a result of intensive research in order to solve the above-mentioned problem. , the amount of spray agent sprayed from the nozzle is made variable depending on the position of the nozzle in the injection sleeve so that the amount of spray agent sprayed from the nozzle is gradually decreased and lowered, and the spray agent is ejected from the nozzle in a radial direction onto the inner surface of the injection sleeve. I decided to apply it.

[For production]

In this way, the amount of spray agent sprayed from the nozzle is varied depending on the position of the nozzle within the injection sleeve.

When the nozzle is moved, the amount of spray agent applied per unit area is reduced at the lower part of the inner surface of the injection sleeve than at the upper part, but the spray agent applied at the upper part drips down to the lower part of the inner surface of the sleeve, resulting in The amount of spray agent applied is uniform from top to bottom.

〔Example〕

FIGS. 1 through 7 are diagrams for explaining the method of spraying onto an injection tube according to the present invention.

Figure 1 is a schematic configuration diagram of the spray device, Figure 2 is a schematic diagram of the horizontal clamping vertical casting die casting machine that implemented this, and the road side view and Figure 2 are the amount of spray liquid sprayed from the nozzle and the injection sleeve. FIG. 3 is a diagram showing the relationship between the stroke and the nozzle position within the stroke.

In FIG. 2, a fixed platen 2 and an end platen are erected at both ends of a machine base 1 fixed to the floor, with their four corners connected by tie rods 4. A movable platen 5 is disposed between the filters and is slidably supported by tie rods 4 and machine base 1. A fixed mold 8 and a movable mold 9 each having a half-split cavity 6 and a fixed sleeve 7 are attached to the fixed platen 2 and the movable platen 5, respectively. A mold clamping cylinder 10 is fixed with its piston rod 11 protruding forward from an end platen roller. The working end of the piston rod 11 is connected to the movable platen 5 via a trouble mechanism 12.
The movable platen 5 is moved forward and backward by moving the piston rod 11 forward and backward by the hydraulic pressure of the mold clamping cylinder 10 via the trouble mechanism 12, and the molds 8 and 9 are clamped and opened. Cavity 6 and fixed sleeve 7 are closed by mold clamping.
are each integrally joined.

On the other hand, in the pit 1 filter under the floor below the mold installation part,
The support frame 14 is fixed to the platen 2-! Or it is supported and suspended from the machine base 1.

An injection cylinder 15 is supported by the support frame 14 so that the injection cylinder 15 can freely tilt with its lower end shaft portion fitted into the lower end pivot support of the support frame 14 . Reference numeral 16 denotes a block supported above and concentrically with the injection cylinder 15, which can be raised and lowered, and on the upper side of the inside thereof.

Coupling 17 to piston rod of injection cylinder 15
A plunger 18 is connected to the block 16 and is movable up and down, and a cylindrical injection sleeve 19, which is shown enlarged in FIG. 1, is fixed to the upper end of the block 16. The plunger 1 is inserted into the inner hole 19a of the injection sleeve 19.
A plunger tip 20 as the head of the mold 8 is slidably fitted therein, and the injection sleeve 19 is raised together with the block 16 which is raised by a hydraulic device (not shown) to fix the clamped molds 8 and 9. It is configured to be concentrically joined to the sleeve 7. 21 is a tilting cylinder supported by the support frame 14 via a bracket 22,
The piston rod 2 is pivotally connected to the injection cylinder 15, and by moving the piston rod 2 forward and backward with the hydraulic pressure of the tilting cylinder 21, the injection cylinder 15. block 1
The 6° injection sleeve 19 and the like are configured to stand up and tilt together between the upright position shown in the figure and the inclined position shown by the chain line.

After mold clamping due to this configuration.

The injection cylinder 15 etc. are tilted by the tilting cylinder 21 to supply molten metal into the injection sleeve 19, and the injection cylinder 1
5 etc. and then raise the block 16, the injection sleeve 19 is joined to the fixed sleeve 7. Therefore, when the plunger 18 is raised by the hydraulic pressure of the injection cylinder 15, the plunger tip 20 rises inside the injection sleeve 19.

The molten metal in the injection sleeve 19 is pushed up and into the cavity 6.
Injected and filled inside. By waiting for the filled molten metal to solidify and cool down, and then opening the mold and taking out the product, 1.
1 casting cycle is completed.

A die-casting machine configured like this.

A spray device 24 for spraying the injection sleeve as shown in FIG. 1 is provided. This spray device 24 includes the injection sleeve 1
A movable cylinder roller 0 is located near the tilting position of 9 and fixed to the machine base 1 side, and the piston rod roller 1 of the movable cylinder roller 0 has a driving force that becomes concentric with the injection sleeve 19 when the movable cylinder roller 0 moves forward. Cylinder roller 2 is fixed. Hollow piston rod roller of drive cylinder roller 2.

It is configured to be moved forward and backward by a hydraulic device, which will be described later, and to be inserted into the inner hole 19a of the injection sleeve 19 and raised and lowered. '54 is a tank for storing spray liquid, and a piping filter 5 connected to this tank filter 4 is led to a piston rod roller, and a pump filter 6 and a piping filter 5 are connected to this piping filter 5. An on-off valve 7 that opens and closes and a flow rate adjustment valve 58 are provided.

The filter 8 is a hollow tube extending upward from the piston rod roller, and the piping filter 5 passes through the hollow portions of the hollow tube filter 8 and the piston rod roller.

It is led to a nozzle device 9 attached to the lower end of the piston rod roller. The nozzle device filter 9 is formed into a cylindrical shape with a bottom, and nozzles 40 are installed at positions dividing the circumferential surface into a plurality of equal parts.
When the on-off valve filter 7 is opened and the pump filter 6 is started, the spray liquid in the tank filter 4 flows into the pipe 5.
It is configured to eject in a radial direction as shown by reference numeral 41 in the figure. Of course, by adjusting the opening degree of the flow rate regulating valve 58, the amount of spray liquid sprayed from the nozzle 40 can be automatically adjusted as appropriate.

The hydraulic system, designated as a whole by the reference numeral 42, includes solenoids 4 and 4.
A four-way valve 47 is connected to a hydraulic pump 45 and a tank 46, and both boats of the four-way valve 47 are connected to the head end side trot of the driving cylinder filter 2 through piping 48 and 49. connected to the end side.

Then, when the hydraulic pump 45 is started and the solenoid 4 is energized, pressure oil is supplied to the head end side of the drive cylinder 2 and the nozzle device 9 is lowered, and when the solenoid 44 is energized, the pressure oil is supplied to the drive cylinder 2. is fed to the rod end side, and the nozzle device filter 9 rises.

Reference numeral 50 denotes a controller in which an operation program for the entire device is incorporated, and is electrically connected to the on-off valve 7 and the variable electromagnetic flow rate regulating valve 58 via a sequencer 51, and the solenoids 4 and 44 are also electrically connected. connected,
The spray liquid 41 is ejected at a predetermined timing, and the spray liquid 4
With a spout amount of 1.

The nozzle device 219 is configured to be switched between rising and falling. Furthermore, the 7-controller 50 and the controller 51 have a function of automatically controlling the amount of spray liquid applied at a predetermined time or a predetermined position of the nozzle 40, and a function of controlling the ascending and descending speed of the nozzle device filter 9. have.

That is, in the vertical mechanism of the nozzle device 39, a speed controller 54,55 consisting of a check valve 52 and a variable throttle valve 5 is electrically connected to the controller 50 in each of the pipes 48,49. and are arranged respectively, and
Near the magnetic scale 56 provided on the hollow tube filter 8,
A detector 57 is provided which is electrically connected to the controller 5o and detects the graduations of the magnetic scale 56 and generates a signal. Then, a signal from a detector 57 according to the vertical position of the nozzle device filter 9 is transmitted to a speed controller 54 via a controller 50.
The degree of throttling of the variable throttle valve 5 at 55° changes, and the rising and descending speeds of the nozzle device 9 increase, respectively.

The gear is configured to be changed during descent. In this device, when the nozzle device filter 9 descends from the upper limit position, the speed is gradually increased as it descends, and when the nozzle device filter 9 rises from the lower limit position, it is gradually decelerated as it ascends. You can also. Of course, the ascending speed and descending speed of the nozzle device filter 9 are kept constant.

It is also possible to automatically change the amount of spray liquid applied depending on the position of the nozzle 40.

When moving the nozzle device filter 9 at a constant speed to control the amount of spray liquid applied, the signal from the detector 57 according to the vertical position of the nozzle device filter 9 is used.

The configuration is such that the degree of throttling of the flow rate regulating valve 58 is changed via the controller 50, and the amount of spray liquid applied is automatically changed during the ascent and descent of the nozzle device filter 9, respectively. In this device, when the nozzle device filter 9 descends from the upper limit position, the amount of spray liquid applied gradually decreases as the nozzle device filter 9 descends.

When the nozzle device filter 9 rises from the lowered position, the amount of spray liquid applied is set to gradually increase as the nozzle device filter 9 rises.

Of course, both the rising and falling speed of the nozzle device filter 9 and the amount of spray liquid applied depending on the nozzle position can be controlled and changed at the same time.

A method of spraying onto an injection sleeve using the spray device configured as described above will be explained.

Injection sleeve 1 of the injection device tilted to the chain line position in Figure 2
Spray liquid 4 is applied to the inner surface 19a of 9 before supplying the molten metal.
1 is applied. Namely.

After moving the piston rod 1 of the movable cylinder '50 forward to move the drive cylinder 2 to a position concentric with the injection sleeve 19, the pump 36 and hydraulic pump 45 are started, and are opened and closed by commands from the controller 50. The valve 7 opens, the flow rate adjustment valve 58 opens at an appropriate opening degree, and the solenoids 4 and 44 alternately repeat excitation and demagnetization at predetermined timing. Therefore, the pressure oil is alternately sent to the head end side and the rod end side of the drive cylinder filter 2, and the nozzle device '59 repeatedly ascends and descends, and the spray liquid 41 is ejected from the nozzle 40, and the injection sleeve 19 A spray liquid 41 is applied to the inner surface of the holder.

When the nozzle device filter 9 moves up and down, a detector 57 facing the magnetic scale 56 detects its height position and issues a signal, and the opening of the variable flow rate regulating valve 5 is controlled via the controller 50. is changed according to a predetermined program, so the nozzle device '59 repeats a reciprocating motion in which the amount of spray liquid applied is lowered while gradually decreasing and then raised while increasing it gradually.

Therefore, although it is surprising, the amount of spray liquid applied per unit area decreases from the top to the bottom of the sleeve inner surface 19a.

The spray liquid 41 applied to the top drips down along the inner surface 19a, and the amount applied increases as it goes toward the bottom, so there is a difference in the amount applied due to changes in the amount of spray liquid applied and a difference in the amount applied due to dripping. are canceled out.

The spray liquid 41 is uniformly applied to the inner surface 19a at any position above or below.

FIG. 6 is a diagram showing the relationship between the stroke of the nozzle device and the amount of spray liquid applied during this application.

Fig. 4(a) shows the lowering state, and Fig. 3(b) shows the ascending state. In these figures, the horizontal axis represents the stroke St of the nozzle device filter 9, and the vertical axis represents the spray liquid spray amount Q at each stroke position. As is clear from Figures (a) and (b), when descending, the amount of spray liquid applied gradually decreases, then stops, and then moves upward, and when ascending, the amount of spray liquid applied gradually increases, and then stops. and move on to descend. In addition, since the nozzle device filter 9 protrudes above the opening end of the injection sleeve 19 by Δt at the upper limit, this upper eye and the injection sleeve 19
To save the spray liquid 41, the controller 51 is connected to the open end of the controller 51.
The opening/closing valve 7 is closed to prevent spraying, and this area is indicated by Δt in the diagram (aL(b)).Also, when descending as shown in diagram (a), Since the advancing direction of the nozzle device filter 9 and the dripping direction of the spray liquid 41 are the same, the rising time shown in FIG. Spray liquid 4 reduces the overall amount of spray liquid sprayed.
The amount of coating No. 1 can also be reduced. That is, in Fig. 6 (a) and (b), the maximum spray amount Q1 during descent
can be set to be larger than the maximum spray amount Q2 during rising. In addition, when the spraying work is finished,
A driving cylinder 2 is moved by a moving cylinder 0 and stored out of the way.

In each of the above embodiments, an example is shown in which the nozzle device 9 is only moved up and down without rotating.

By raising and lowering this while rotating it in one direction, or by raising and lowering it while rotating it alternately in the forward and reverse directions by a predetermined angle, the coating of the spray liquid 41 can be made uniform in the circumferential direction. , even more effective.

In addition, when changing the amount of spray liquid applied depending on the nozzle position, instead of controlling it using a position detector such as the magnetic scale 56 and a preset program, it is also possible to control it using a timer and a preset program. You can also do that.

Of course, the amount of dispersion can be changed not only by the -dimensional number of surfaces, but also by
It can also be changed quadratically or according to an arbitrary function.

〔Effect of the invention〕

As is clear from the above explanation, the method of spraying the injection sleeve according to the present invention involves inserting the nozzle from the upper end opening of the injection sleeve, lowering the spray agent while gradually reducing the amount, and gradually increasing the amount of spray agent sprayed. While changing the amount of spray agent applied depending on the position of the nozzle within the injection sleeve, the nozzle device repeats the reciprocating motion of the nozzle to eject the spray agent in a radial direction from the nozzle and apply it to the inner surface of the injection sleeve. By adopting this method, the increase in the amount of application per unit area at the bottom due to dripping of the spray agent and the decrease in the amount of application per unit area at the bottom due to the speed increase of the nozzle device are offset. As a result, the spray liquid is uniformly applied to the inner surface of the injection sleeve from top to bottom, and dripping spray liquid does not accumulate or evaporate, improving the quality of the cast product.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 7 are diagrams for explaining a method of spraying an injection sleeve according to the present invention. Fig. 1 is a schematic configuration diagram of the spray device, Fig. 2 is a schematic side view of a horizontal clamping vertical casting die casting machine that implements this, and Fig. 6 is a relationship diagram between the amount of spray liquid applied and the stroke of the nozzle device. Fig. 4(a) is a relationship diagram when the nozzle device is lowered, and Fig. 4(b) is a relationship diagram when the nozzle device is raised. 19... Injection sleeve, 19a... Inner surface, 24...
・Spray device, Roro 2... Drive cylinder, Roro...
Piston rod, filter 9... Nozzle device, 40... Nozzle, 41... Spray liquid, 42... Hydraulic device, 50
...controller, 56...magnetic scale. 57...Detector, 58...Flow rate adjustment valve patent applicant
Ube Industries Co., Ltd. Figure 1 Purchase Pi 3

Claims (2)

[Claims] (1) Injection using a nozzle that slides longitudinally inside the injection sleeve and sprays the spray agent radially in the radial direction, and the amount of spray agent sprayed from this nozzle is variable depending on the position of the nozzle inside the injection sleeve. How to spray onto sleeves. (2) A method of spraying onto an injection sleeve according to claim 1, wherein the amount of spray agent sprayed from the nozzle is reduced as the nozzle advances into the injection sleeve through the injection sleeve opening.