JP3360569B2 - Tie bar nut splitter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tie bar nut splitting device in a mold clamping device of a die casting machine or an injection molding machine.

[0002]

2. Description of the Related Art Generally, in a mold clamping apparatus of a die casting machine and an injection molding machine, an upper tie bar is usually pulled out to easily replace a mold. For this purpose, various models are adopted by each company, but in each case, the fixed nut is divided into two parts by some method and tie bars are removed.

The following are typical conventional methods. That is, as shown in FIG. 9, the structure is such that a spring 80 is interposed in a divided surface mainly composed of two divided nuts,
Protrusions 86 are provided on both sides of the butted portion of the split nut bodies 82 and 84, and the nut support 9 is attached to a fixed platen 88.
A pair of arms 92 each having one end pivotally mounted on both sides of the nut are provided on both sides of the nut, and a pair of arms 9 are provided on both sides of the nut.
The other ends of the two are connected by a cylinder 94, respectively.

In the split nut shown in FIG. 10, one side of the split nuts 82 and 84 is formed as a pin hinge 96, and the other side is opened and closed by operating a link mechanism 98 and a split cylinder 100. It was made.

In the split nut splitting apparatus shown in FIGS. 9 and 10, a tie bar stopper is brought into contact with the end of a tie bar (not shown) before the split nut is engaged with the threaded portion of the tie bar. , A separate stopper device for loosening was provided.

[0006]

However, the former FIG.
The structure of the tie bar nut splitting device shown in Fig. 1 is very good when the nuts are combined (shown by a solid line) and small, and is very good. ) Has the disadvantage that the nut is tilted to the right and the nut division is likely to be incomplete.

The tie-bar nut splitting device having the structure shown in FIG. 10 has advantages over the device shown in FIG. 9, but has disadvantages such as an increase in size of the device and poor balance with the machine body. In addition to the split nut splitting device shown in FIGS. 9 and 10, it is necessary to provide a stopper device of a tie bar for adjusting the stopper by a driving device, so that there is a problem that the device itself becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to make a nut split smoothly by moving right and left with respect to a tie bar, and to have a tightening center engraved on the tie bar. The present invention provides a tie bar nut dividing device which is made possible by contacting a set screw or groove.

[0009]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In the first invention according to the present invention, the end of the upper tie bar
The tie bar and the split nut mesh or
A tie bar nut splitting device for releasing meshing
Located at the bottom of the barDoone endButWhen rotatably supported
The other end is divided into two parts that can be opened and closed with respect to the tie bar.
And the upper end of the split nut is always engaged.
It consists of a rocking piston that can be freely moved up and down.,
Hydraulic syringe so that it is located above the locking piston
And the center of the locking piston.
Of the piston rod, which is screwed to and protrudes downward
The forcible push-back member fixed to the part is split into two
Collision with the corner provided on the inner facing surface
With a structure that can mechanically release the mesh between the socket and tie bar.
In the second invention mainly based on the first invention, two
A projecting part is arranged above the split nut, and the upper end of the projecting part is
A first slope with a small slope on the outer periphery, and a lower
A second slope having a divergent shape as it moves toward
Part was provided.

[0010] In a third invention mainly based on the second invention,
A locking piston whose lower end is formed in a concave shape is disposed so as to be able to engage with the protruding portion of the split nut, and a slope having a divergent space shape is formed as the concave portion is moved downward. A large third inclined portion, and a fourth inclined portion having a shape with a small gradient continued from the third inclined portion are provided. Further, in a fourth invention mainly based on the second and third inventions, a split nut is provided. Is released from the engagement with the tie bar, the first inclined portion provided on the projecting portion of the split nut comes into contact with the fourth inclined portion engraved in the concave shape of the locking piston, When the split nut and the tie bar are engaged with each other, the second inclined portion provided on the projecting portion of the split nut may come into contact with the third inclined portion formed in the concave shape of the locking piston. Structured.

[0011] In a fifth invention mainly based on the first invention,
A spring for mechanically releasing the engagement between the split nut and the tie bar and assisting the opening is elastically mounted on the split nut so as to be positioned above and below the tie bar.

[0012] In the sixth aspect of the present invention which is mainly a first aspect of the present invention,
According to a seventh aspect of the present invention, which is mainly based on the first aspect, the engagement between the split nut and the tie bar is released by releasing the forcible pushing / retreating member into a frusto-conical shape having a downward divergent shape. At that time, the structure was such that the opening of the split nut could be confirmed by contacting the limit switches respectively arranged on both outer peripheral end faces of the split nut. Further, in the eighth invention mainly based on the first invention, when the locking piston descends to the lower limit and the split nut and the tie bar mesh with each other, the limit switch is arranged at a position located at the upper end of the locking piston. And made contact with each other so that the engagement state between the split nut and the tie bar can be confirmed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tie bar nut dividing apparatus according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 is an explanatory view showing a state in which the split nut of the present invention is engaged with the tie bar, FIG. 2 is an explanatory view showing a state in which the split nut is released from the engagement with the tie bar, and FIG. FIG. 4 is an enlarged view showing a state before the split nut and the tie bar are meshed, and FIG. 5 is a partially enlarged view showing a meshed state between the split nut and the tie bar. 6 is an explanatory view for explaining the opening / closing operation of the split nut, FIG. 7 is a front view of the die casting machine, and FIG. 8 is a plan view of the die casting machine.

First, the structure of the die casting machine will be described with reference to FIGS. A machine base 1 formed of a steel plate, a shaped steel, or the like is provided on a floor. On one end of the machine base 2, a stationary platen 3 formed in a substantially square shape is mounted, and a sleeve and a tip (not shown) for casting molten metal slightly below the center thereof are provided. Is installed.

On the machine base 2, a fixed platen 3
And the link housing 4 are erected with their planes facing each other. Four corners of the fixed platen 3 and the link housing 4 are connected by tie bars 5. Reference numeral 7 denotes a movable platen supported by the four tie bars 5 and having a flat surface opposed to the fixed platen 3. The movable platen 7 and the fixed platen 3 include a fixed mold 11 having a mold cavity 11a. The mold cavity 12a and the movable mold 12 are detachably mounted.

One or two of the upper portions of the four tie bars 5 are fixed by screwing nuts 6 to the threaded portions at both ends thereof, and the link housing 4 uses the nut 6 provided on the outside thereof. The so-called die height adjustment corresponding to the thicknesses of the dies 11 and 12 is performed by rotating them all at once on the machine base 2. Reference numeral 8 denotes a mold clamping cylinder.
And the movable platen 7 moves forward from the mold open state to perform mold clamping.

Reference numeral 14 denotes a tie bar removing device, 16 denotes a safety door, 18 denotes a tie bar nut dividing device, 20 denotes an injection device, and 22 denotes a release agent spraying device having a spray head that can move up and down and right and left.

The tie bar nut dividing device 18 used in this embodiment will be described in detail. First, as shown in FIG. 8, the tie bar nut dividing device 18 is disposed on the operation side of the upper tie bar 5 on the fixed platen 3 side among the four tie bars 5.

The tie bar nut dividing device 18 has a 24 (2
4a, 24b) are split nuts, 26 (26a, 26)
b) is a strong spring, 28 is a split nut case, 30 is a locking piston, 32 is a connection rod, 34 is a hydraulic cylinder, 36 is a forcible pushing / retracting member, 38 is a piston rod, 40 is a guide bush, and 42 is a hydraulic cylinder mounting seat. , 44 are coupling pins, 46, 47, 48 are limit switches, 49 is a lubricating oil port, 50 is a proximity switch, 52
Is a tie bar pressing bolt, 54 is a tie bar pressing bolt nut, and 56 is a detent screw.
In the present embodiment, a case will be described in which only one of the upper tie bars 5 on the operation side is pulled out. However, the present invention is not limited to this case. The tie bar nut dividing device 18 may be attached to each of the tie bars 5.

As shown in FIG. 1, the lower ends of the split nuts 24a and 24b having a donut shape in front view are accommodated in the split nut case 28 by being pivotally supported by connecting pins 44, and the upper ends thereof are formed. The so-called split nuts 24a and 24b for releasing the meshing state with the tie bar 5 or maintaining the meshing state are opened and closed.

Further, first inclined portions 25a, 25b having a large matching angle are provided on the outer peripheral portions of the upper ends of the projecting portions 23a, 23b of the split nuts 24a, 24b, and the outer peripheral portions are separated from the first inclined portions 25a, 25b. As it moves downward, there are provided second inclined portions 27a and 27b each having a small fitting angle and a front section having a divergent shape.

An engaging device 37 that engages with the split nuts 24a and 24b and forcibly opens and closes is slidably provided on the inner wall surface of the split nut case 28. The engagement device 37 includes a locking piston 30, a connection rod 32, and a forcible push-back member 36 fixed to the lower end of the rod 33. The upper portion of the forcible pushing / retreating member 36 has the same diameter as the rod 33, and the lower portion has a flared cone-shaped structure.

When the meshing state between the split nuts 24a and 24b and the tie bar 5 is released, the hydraulic cylinder 3
4, when raising the forcible push-back member 36 by introducing hydraulic pressure, the protrusions 23a, 23 of the split nuts 24a, 24b
The structure is such that the meshing state between the split nuts 24a, 24b and the tie bar 5 can be forcibly released by colliding with the corners 62a, 62b engraved on the inner facing surface of the b.

On the other hand, the outer periphery of the lower end of the locking piston 30 has a structure having a concave divergent shape in the downward direction, and as shown in FIG.
24b. That is, FIG.
As shown in (1), when the split nuts 24a, 24b are engaged with the tie bar 5, the protrusions 23a, 23
b of the locking piston 3
It is configured to abut and engage with the third inclined portions 29a and 29b of the 0 concave portion.

As shown in FIG. 6 (2), when the split nuts 24a and 24b are disengaged from the tie bar 5, the first inclined portions 25a of the projections 23a and 23b,
25b are respectively in contact with and engaged with the fourth inclined portions 31a and 31b of the concave portion of the locking piston 30.

A locking piston 3 having a circular cross section.
0 has a chamfered inclined portion at the upper end corner portion 30a, and a limit switch 48 is attached to the hydraulic cylinder mounting seat 42 in a state where the tip protrudes so as to be able to contact the upper end corner portion 30a. . And the hydraulic cylinder 3
When the locking piston 30 is lowered to near the lower limit by actuating the limit switch 4, the limit switch 48 and the upper end corner 30 a come off, and the limit switch 48 is turned off, so that the split nuts 24 a and 24 b and the tie bar 5 are turned off. It can be confirmed that they are engaged with each other.

Conversely, when the locking piston 30 is raised to the upper limit by the operation of the hydraulic cylinder 34,
As shown in the figure, the split nuts 24a and 24b
It will be in an open state up to the opening limit separated from.

For this reason, a pair of limit switches 46, 47 mounted opposite to both parts of the split nut case 28 are provided.
, The limit switches 46 and 47 are turned on, and the extension nuts of the pair of strong springs 26 provided above and below the tie bar 5 are assisted by the split nuts 24a,
It can be confirmed that the engagement between the tie bar 5 and the tie bar 5 has been released.

As shown in FIG. 3, a tie bar pressing bolt 52 is screwed to an end of the tie bar 5 with a screw cut in the split nut case 28. The tie bar pressing bolt nut 54 is appropriately tightened until the proximity switch 50 attached to the shaft center of the tie bar pressing bolt 52 is turned on.

Screws or grooves 60 having an appropriate pitch are engraved on the tie bar 5, and as shown in FIG.
The cross section of the screw or groove 60 has a trapezoidal shape. On the other hand, a screw or groove 58 having the same shape as the tie bar 5 described above is also formed on the split nuts 24a and 24b.

The end of the tie bar 5 has already been brought into contact with the tie bar pressing bolt 52, so that the tie bar 5 cannot move to the left in FIG.
Are screwed or grooves 60 of the tie bar 5
Slope 58a inclined surface 5a and two split nuts 24a of the thread or groove 58 is engaged by the clamping force of the strongly pressed F _1, the tie bar 5 is adapted to be completely locked impossible lateral movement.

Next, the operation of the tie-bar nut dividing device thus configured will be described.

When it is desired to exchange the fixed mold 11 and the movable mold 12 due to a change in the shape of the product to be produced, first, the toggle mechanism 10 is retracted to bring both the molds 11 and 12 into the mold open state. Thereafter, in order to replace the two dies 11, 12, four tie bars 5 which hinder the replacement of the two dies 11, 12 will be described.
One of them is pulled out. Then, both dies 11, 1
After replacing 2 tie bar 5 that was pulled out at the time of replacement
After the tie bar 5 is inserted into an insertion hole (not shown) of the tie bar 5 of the link housing 4 in order to return the tie bar 5 to its original attached state, the tie bar removing device 14 is operated to divide the end of the tie bar 5 into two nuts 24a and 24b. The tie bar pressing bolt 52 of the opened tie bar nut dividing device 18 is brought into contact with the tie bar nut dividing device 18, and the tie bar nut is inserted and mounted to a position where the proximity switch 50 is turned on.

At this time, if an injection molding machine, a die casting machine, or the like is newly purchased, or if the tie bar 5 or the tie bar nut dividing device 18 is damaged, the tie bar 5 and the split nuts 24a and 24b are engaged again. Prior adjustments are required where possible. That is, the two split nuts 24a, and the inclined surface 5 of the screw or the groove 60 slopes 58a and tie bar 5 of the screw or the groove 58 of 24b abuts clamping force F ₁ in mesh acts, tie bar nut splitting device 1
8 keeps the tie bar 5 in a completely locked state.

From the state where the engagement between the split nuts 24a and 24b and the tie bar 5 as shown in FIG. 2 is released, the split nuts 24a and 24b and the tie bar 5 as shown in FIG. The operation for setting the state is specifically performed as follows. That is, as shown in FIG. 2, the hydraulic pressure is currently introduced into the hydraulic cylinder 34, the locking piston 30 moves to the upper limit, and the split nut 24
The lower portions of the split nuts 24a and 24b are opened at the lower portions of the split nuts 24a and 24b with the coupling pin 44 as the support shaft, and the split nut 2
The engagement state between the tie bar 5 and the tie bar 5 has been released. Under such a condition, the limit switch 4
8 is in the OFF state, and at the same time, the limit switch 46,
47 is in an ON state.

In this state, the tip of the tie bar 5 is inserted and mounted to a position where the proximity switch 50 is turned on. Then, when the pressure oil is introduced into the hydraulic cylinder 34 and the piston rod 38 is moved downward to the lower limit in which the piston rod 38 is extended downward (the locking piston 30 also moves to the lower limit), the tie bar 5 is split into two by the tie bar nut splitting device 18. Nut 24a, 2
The mold is engaged by 4b and is locked. Under such a state, the limit switch 48 is on and the limit switches 46 and 47 are off.

After the tie bar 5 is attached to a predetermined position and locked, the toggle mechanism 10 is extended and the two dies 11, 1
2. Perform mold closing and mold clamping. Next, a predetermined amount of molten metal is filled into the mold cavities 11a and 12a from a hot water supply device (not shown), and then the two dies 11 and 12 are cooled and the molten metal is taken out as a product. After continuously manufacturing the products in this manner, the two dies 11, 12 due to the change in the product shape.
The above-described operation is performed again with the replacement of.

[0039]

As is apparent from the above description, according to the present invention, when the tie bar is inserted into the tie bar nut dividing device, the end surface of the tie bar comes into contact with the stopper device having a simple structure, and then the two tie bars are separated. By simply closing the split nut, the split nut and the tie bar can mesh with each other, and can be meshed in a state in which insertion and removal cannot be performed in a short time. Further, a truncated cone-shaped forcible pushing / retreating member is fixed to a lower end of a rod screwed and screwed to a lower portion of a locking cylinder which moves up and down in a split nut case by a hydraulic cylinder, and is engaged with a tie bar. Forcibly releasing the halved nut from the tie bar can be reliably and easily performed only by introducing pressure oil into the hydraulic cylinder. Further, while positioning the hydraulic cylinder above the center of the axis of the tie bar,
At the lower part of the tie bar facing the hydraulic cylinder, there is a rotary support shaft portion of a split nut. The other end of the split nut opens and closes around this, and is engaged with the tie bar. There are many effects such as a good balance, a relatively compact and inexpensive device.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a split nut of the present invention is engaged with a tie bar.

FIG. 2 is an explanatory diagram in a case where a split nut has released a meshing state with a tie bar.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an enlarged view showing a state before a split nut and a tie bar are engaged.

FIG. 5 is a partially enlarged view showing a meshing state between a split nut and a tie bar.

FIG. 6 is an explanatory diagram illustrating an opening / closing operation of a split nut.

FIG. 7 is a front view of the die casting machine.

FIG. 8 is a plan view of the die casting machine.

FIG. 9 is a side view a, a plan view b, and a nut cross-sectional explanatory view of a conventional tie bar nut dividing device.

FIG. 10 is a side view a and a plan view b of a conventional tie bar nut dividing device.

[Explanation of symbols]

 2 Machine base 3 Fixed platen 4 Link housing 5 Tie bar 5a Screw or groove side slope (tie bar side) 6 Nut 7 Movable platen 8 Mold clamping cylinder 10 Toggle mechanism 11 Fixed mold 11a Fixed mold cavity 12 Movable mold 12a Movable Mold cavity 14 Tie bar removing device 16 Safety door 18 Tie bar nut splitting device 20 Injection device 22 Release agent spraying device 24 (24a, 24b) Split nut 25 (25a, 25b) First inclined portion 26 Strong spring 27 ( 27a, 27b) Second inclined portion 28 Split nut case 29 (29a, 29b) Third inclined portion 30a Corner 30 Locking piston 31 (31a, 31b) Fourth inclined portion 30 Spray head 32 Connection rod 34 Hydraulic cylinder 36 Forced pressing Retreat member 37 Engagement device 38 Stone rod 40 Guide bush 42 Hydraulic cylinder mounting seat 44 Connection pin 46, 47, 48 Limit switch 49 Lubricating oil port 50 Proximity switch 52 Tie bar pressing bolt 54 Tie bar pressing bolt nut 56 Detent nut 58 Screw or groove (split nut side) 58a Screw or groove side slope 60 Screw or groove (tie bar side) 62 (62a, 62b) Corner 54 Atomizer 56 Manifold 58, 59 Air piping 60 Spray liquid piping 62 Movable valve 64, 66, 68 Solenoid valve 80 Spring 82 Split nut main body 84 Split nut main body 86 Projection 88 Fixing plate 90 Nut support 92 Arm 94 Cylinder 96 Pin hinge 98 Link mechanism 100 Split cylinder

Claims (8)

(57) [Claims] 1. A is disposed at an end of the upper tie bars, a tie bar nut splitting device for releasing the engagement or meshing of the tie bar and two split nuts, rotation <br/> one end located below the tie bars A split nut that is freely supported and has the other end openable and closable with respect to the tie bar, and a locking piston that is vertically engaged and always engaged with the upper end of the split nut. And the locking piston
While arranging the hydraulic cylinder so that it is located at the top,
It is screwed to the center of the locking piston and
Forced retreat fixed to the tip of the piston rod that protrudes
The member is disposed on the inner facing surface of the projection of the split nut.
Collision between the split nut and the tie bar.
A tie-bar nut splitting device having a structure capable of mechanically releasing a joint . 2. A protruding portion is provided on an upper portion of the split nut according to claim 1, and a first inclined portion having a small inclination is provided on an outer peripheral portion of an upper end of the protruding portion, and a continuous outer peripheral portion is downwardly provided. A tie bar nut splitting device, comprising a second inclined portion having a shape that expands as it moves. 3. A locking piston having a lower end formed in a concave shape so as to be able to engage with the projecting portion of the split nut according to claim 2, and moving the concave portion downward. A tie-bar nut splitting device comprising: a third inclined portion having a large gradient having a diverging spatial shape according to the above, and a fourth inclined portion having a shape having a small gradient continued from the third inclined portion. 4. A first inclined portion provided at a projecting portion of the split nut when the split nut according to claim 2 or 3 is released after being disengaged from the tie bar. When the fourth inclined portion engraved in the concave shape of the locking piston abuts and the split nut and the tie bar mesh with each other, the second inclined portion provided on the protruding portion of the split nut and the locking portion are locked. A tie bar nut splitting device, wherein a third inclined portion engraved in a concave shape of a piston comes into contact. 5. The split nut and tie bar according to claim 1.
A spring that is mechanically released from engagement with
We put on split nut so that it is located above and below the tie bar
A tie bar nut splitting device. 6. The shape of the forcible pushing / pulling member according to claim 1 is set downward.
Characterized by a frusto-conical shape that is widened to the end
Tie bar nut splitter. 7. The halved nut and tie bar according to claim 1.
When the meshing is released after being disengaged,
Limit switches located on both ends of the outer circumference
To make it possible to confirm the opening of the split nut by contacting
A tie bar nut splitting device. 8. The locking piston according to claim 1, wherein said locking piston is lowered.
When the nut and tie bar mesh
To the position located at the upper end of the locking piston.
Contact with the nut switch and split the nut and tie
The structure is such that the meshing state with the bar can be checked.
Tie bar nut splitting device.