JP5396973B2 - Cooling mechanism of machine base sliding part in mold clamping device - Google Patents

Description

  The present invention relates to a cooling mechanism for a machine base sliding portion in a mold clamping device, and in particular, in a large mold clamping device, the lubricity of a movable part that reciprocates at a high speed is not impaired.

In recent years, large-scale molding machines such as injection molding apparatuses have been increased in speed in order to improve the production capacity of molded products.
By the way, the problem of lubrication of a movable part can be mentioned as a problem which generally becomes a problem by increasing the speed of a large molding machine.

  For example, in the mold clamping device of an injection molding machine disclosed in Patent Document 1, the movable platen is configured to support the rail on the bed via a ball slider.

  However, in such a configuration, since the friction coefficient is too small, it is necessary to increase the deceleration distance during deceleration during the mold opening operation, and the opening / closing time becomes long. In addition, stop control is difficult, and the stop position varies. In addition, the ball slider is expensive and incurs high costs.

  On the other hand, in the lubricating device for an injection molding machine disclosed in Patent Document 2, lubricating oil is circulated and a cooling device is incorporated in the middle of the circuit so as to suppress the temperature rise.

  However, since the operation stroke of the movable platen is long, the efficiency of collecting the lubricating oil accumulated in the machine base oil receiver is poor, and it is difficult to circulate.

Japanese Patent Laid-Open No. 61-60253 JP 2003-220638 A

Further, as a lubricating means for the movable platen plate of the mold clamping device of the injection molding device, the movable platen 4 movably disposed in the toggle type electric mold clamping device 1 shown in FIG. Kobel liner CL is used so that it can do.
The toggle type electric clamping device 1 includes a fixed platen 3 fixed on the base plate 2, a movable platen 4 facing the fixed platen 3 so as to be movable back and forth with respect to the base plate 2, and a link. A mold including a housing 5, a toggle mechanism 7 provided between the movable platen 4 and the link housing 5, and a fixed die 6 a and a movable die 6 b attached between the fixed platen 3 and the movable platen 4. 6 is configured such that the mold clamping motor 8 is driven to operate the toggle mechanism 7, and the movable platen 4 is advanced to the fixed platen 3 side to perform mold clamping.
The corbel liner CL is a steel strip-like thin plate having a smooth surface, and both ends are fixed on the substrate 2 in a state where tension is applied. (Note that there is also a case where the flat plate processing is performed on the substrate 2 without using the Kobel liner CL.)

As shown in FIG. 7, the corbel liner CL is interposed between the movable platen 4 and the base 2 via a guide shoe 9 for adjusting the height of the movable platen and a liner 10 in which an oil groove m for guiding lubricating oil is formed. ing. In this case, the oil groove m in the liner 10 is engraved on the lower surface (bottom surface) in contact with the corbel liner CL (see FIG. 8), and is formed in the lubricant guide passage 11 and the liner 10 formed through the guide shoe 9. The fuel is supplied through the through passage 12. A lubrication hose H is connected to the guide passage 11 of the guide shoe 9 via a joint 13 so that lubricating oil is supplied from the outside.
Further, an oil receiver 14 is provided on the base 2 side on which the corbel liner CL is placed as a discharge side of the lubricating oil.

  In the presence of the lubrication structure using the Kobel liner CL and the lubricating oil as described above, the movable platen is reciprocated on the base 2 to open the mold clamping mold (see FIG. 9).

However, even if there is a lubrication structure using Kobel Liner CL and lubricating oil, if the movable platen is reciprocated at high speed in high cycle operation, the cooling capacity becomes insufficient, and the Kobel Liner CL and the base 2 The sliding surface generates heat, and this heat generation cannot be dealt with only by natural heat dissipation.
In addition, if continuous operation is performed under such heat generation (80 ° C. or higher), the lubricating oil deteriorates and loses its viscosity, and friction during sliding increases, which may have the following adverse effects on the Kobel liner CL. There is. That is,
(1) Mechanical failure due to seizure of corbel liner (2) Mechanical failure due to breakage of corbel liner (3) Shortening of mechanical life due to abnormal wear of liners The present invention has been proposed to improve the above problems. Therefore, the sliding part between the machine base and the liner is forcibly cooled, so that the temperature rise of the corbel liner is suppressed to suppress the deterioration of the lubricating oil, and the machine failure caused by the deterioration of the lubricating oil. An object of the present invention is to provide a cooling mechanism for a machine base sliding portion in a mold clamping device which prevents the above-mentioned problem and improves the machine life.

  In order to solve the above-described problems, in the invention described in claim 1, in the mold clamping device (20) of the die casting machine or the injection molding machine, the sliding on the base (2) on which the movable platen (4) slides is performed. A cooling mechanism (21) for cooling a moving part, wherein cooling is performed by circulating a cooling medium to a member in the vicinity of a sliding part on the base (2).

  Thereby, the temperature rise of the sliding part which generates heat by the sliding operation of the movable platen (4) is suppressed by heat exchange with the cooling medium.

  The invention according to claim 2 is characterized in that the cooling medium is water.

  Thereby, the cost as a cooling facility can be suppressed.

  Further, the invention according to claim 3 is characterized in that the cooling mechanism (21) is cooled by blowing air toward the sliding portion on the base (2) by the cooling fan (30).

  Accordingly, unlike cooling means using a cooling medium such as water, piping equipment for medium distribution is not required as the cooling equipment, and the equipment can be simplified.

  In the above description of the present invention, symbols or numbers in parentheses () are attached to show correspondence with the embodiments described below.

According to the present invention, by forcibly cooling the sliding portion, the lubricating oil temperature can be suppressed to a predetermined temperature or less, deterioration of the lubricating oil can be suppressed, and a good lubricating state can be maintained. This
(1) It is possible to prevent seizure of the corbel liner and prevent machine failure.
(2) Breakage of the corbel liner can be prevented and machine failure can be prevented.
(3) Abnormal wear of liners can be prevented, and the mechanical life can be extended.

It is typical side surface explanatory drawing which shows an example of the mold clamping apparatus provided with 1st Embodiment of the cooling mechanism concerning this invention. It is an expanded principal part side surface explanatory view of the cooling mechanism in the mold clamping apparatus shown in FIG. It is typical plane explanatory drawing of the sliding location which arrange | positioned the cooling mechanism shown in FIG. FIG. 3 is a schematic side view of another sliding portion where the cooling mechanism shown in FIG. 2 is disposed. It is typical side surface explanatory drawing of the sliding location in the mold clamping apparatus which shows 2nd Embodiment of the cooling mechanism concerning this invention. It is typical side surface explanatory drawing which shows an example of the conventional mold clamping apparatus. It is side surface explanatory drawing which looked at the movable board of the mold clamping apparatus shown in FIG. 6 from the metal mold | die attachment surface side. (A) is side surface explanatory drawing of the liner in the sliding location of the mold clamping apparatus shown in FIG. 6, (b) is plane explanatory drawing of a liner. It is principal part side explanatory drawing which expanded and showed the sliding location of the mold clamping apparatus shown in FIG.

(First embodiment)
FIG. 1 shows an example of a mold clamping device in an injection molding apparatus provided with a cooling mechanism according to the present invention. The mold clamping device 20 shown in FIG. 1 has the same configuration as that of the mold clamping device 1 shown in FIG. 6, and the same reference numerals are given to the components not directly related to the present invention. Description of is omitted.
In such a mold clamping device 20, a cooling mechanism 21 is provided on the base 2 that slidably supports the movable platen 4 and the link housing 5 via a corbel liner CL.

For example, as shown in FIG. 2, the cooling mechanism 21 includes a plurality of cooling holes 22 formed by penetrating through a member 2 a in the vicinity of the sliding portion where the corbel liner CL on the base 2 is laid so as to be cut at an appropriate distance. (Refer FIG. 3, FIG. 4) and the cooling hose 24 which connected the opening of each cooling hole 22 via the joint 23 in the both sides | surfaces of the member 2a near a sliding location.
Thereby, the cooling water can be flowed through the cooling hose 24 to the cooling hole 22 crossing the member 2a in the vicinity of the sliding portion, and the heat generation at the sliding portion where the corbel liner CL on the base 2 is laid is suppressed. be able to. The cooling hose 24 is not limited to a hose, and can be replaced with a steel or copper pipe.

  In addition, the structure of the above-mentioned cooling mechanism 21 is an example, Comprising: It can comprise suitably according to the heat_generation | fever condition of a sliding part. For example, although not shown in the drawings, a cooling hole penetrating in the longitudinal direction of the member 2a in the vicinity of the sliding portion is formed along the sliding portion where the corbel liner CL on the base 2 is laid without using the cooling hose 24 or the like. It is also possible to form. Thereby, the heat exchange action is more effectively performed by the cooling water passing through the cooling holes in the member 2a in the vicinity of the sliding portion, and the sliding portion can be forcibly cooled.

(Second Embodiment)
FIG. 5 shows a second embodiment of the cooling mechanism 21 in the mold clamping device 20.
In the cooling mechanism 21 according to the second embodiment, the cooling fans 30 disposed on both side surfaces of the base plate 2 are provided toward the sliding portion where the corbel liner CL on the base plate 2 is laid. In this case, the cooling fan 30 supports the support member 31 in the member 2a in the vicinity of the sliding portion so that the cooling air is directed downward by about 30 degrees from obliquely upward toward the sliding portion where the corbel liner CL is laid. It is supported by.
In addition, it is desirable that a plurality of cooling fans 30 be installed along the sliding direction of the sliding portion in order to efficiently apply the cooling air to the sliding portion where the corbel liner CL is laid.
By providing the cooling air of the cooling fan 30 as described above to the sliding portion where the corbel liner CL is laid, the temperature rise in the surroundings and the sliding portion is suppressed.

  According to the cooling fan 30 as in the second embodiment, unlike cooling means using a cooling medium such as water, piping equipment for medium distribution is not required as cooling equipment, and the equipment can be simplified. Can do.

  As described above, by providing the cooling mechanism 21 at the sliding portion where the corbel liner CL on the base 2 is laid in the mold clamping device 20, the sliding portion is forcibly cooled, and the lubricating oil temperature is set to a predetermined temperature. The deterioration of the lubricating oil can be suppressed by suppressing to the following, and a good lubricating state can be maintained. As a result, the corbel liner CL can be prevented from being seized or broken by sliding heat, and mechanical failure can be prevented. Furthermore, since deterioration of the lubricating oil can be suppressed, abnormal wear of the liners can be prevented by a good lubricating state, and the mechanical life can be extended.

  The present invention is not limited to the cooling mechanism of the machine base sliding portion in the mold clamping device in the injection molding machine mentioned in the above example. The present invention can be applied to other molding apparatuses such as die casting machines.

2a Member near sliding part 20 Clamping device 21 Cooling mechanism 22 Cooling hole 23 Joint 24 Cooling hose 30 Cooling fan 31 Support member CL Kobel liner

Claims (2)

In a mold clamping device (20) of a die casting machine or an injection molding machine, a cooling mechanism (21) for cooling a sliding plane to which lubricating oil is supplied on a base (2) on which a movable platen (4) slides. There,
A plurality of cooling holes (22) formed through the member (2a) supporting the sliding plane on the base (2) so as to cross the sliding direction;
A conduit (24) connecting adjacent ends of the adjacent cooling holes (22), and
To cool the lubricating oil supplied to the sliding plane, said cooling holes (22) of the cooling medium in the conduit (24), characterized that you distribution, machine-based sliding in the mold clamping device Part cooling mechanism.   2. The cooling mechanism for a machine base sliding portion in a mold clamping apparatus according to claim 1, wherein the cooling medium is water.

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