KR20030018904A - Mould adopting device for protecting the ascent of a core - Google Patents

Abstract

PURPOSE: A die adopting device for preventing flotation of core is provided to prevent core from floating using tension of the spring when closing the die by mounting a spring on the side of an upper die. CONSTITUTION: The die adopting device for preventing flotation of core comprises an upper die(61); a lower die(62) connected to the upper die; a core that is set to the lower die; a core print(64) that is installed at one side of the core to hold the upper part of the core; a guide rod(65) which penetrates the upper and lower dies and is installed on the upper part of the core print; a guide block(66) installed on the upper part of the guide rod; a spring(67) which is installed on the guide block, and into the inner diameter of which the upper part of the guide rod is inserted to prevent flotation of the core by pressing the core print; and a guide bush(68) installed at one side of the guide block to fix the spring, wherein tension of the spring is higher than buoyance of the core.

Description

MODULE ADOPTING DEVICE FOR PROTECTING THE ASCENT OF A CORE}

The present invention relates to a mold employing a core anti-floating device, and more particularly, when the spring is mounted on the upper mold side to close the mold, the core is improved to prevent the injury of the core by using spring tension. It is related with the metal mold | die with which the prevention apparatus was employ | adopted.

As shown in FIG. 1, in the raw material production process of the cylinder head, first, an aluminum ingot is melted in a melting furnace to form a molten metal 11, and the molten material 11 is heated with a heater 21 and a float ( 22 is supplied to the casting machine 20 provided.

Then, in the core insertion process, the water jacket or oil passage core 31 of the cylinder head is set in the lower mold 42, and the intake ports and the intake and exhaust combustion chambers are The exhaust port is set in the lower mold 42. At this time, the place holding the core 31 is called a core print (core print) (32).

And a slight gap is given to avoid the interference between the core print 32 and the upper mold 41 and the lower mold 42. In addition, after the core 31 is set, the upper and lower molds 41 and 42 are molded to inject the molten metal 11.

After molding, the upper and lower molds 41 and 42 are separated, and after taking out the product, the cylinder head 50 material is cooled and transferred to a machining process.

2, the intake and exhaust port cores 31 are set. And a slight gap between the upper and lower molds 41 and 42 and the intake and exhaust core prints 32.

On the other hand, it is best to have no such gap, but this is theoretically possible, but not practical. However, a crack occurs in the core 31 due to interference when the upper and lower molds 41 and 42 are combined due to deformation of the mold itself, deformation of the core 31, and the like.

On the other hand, the specific gravity of the sand core is 1.45 g / cm 3 and the specific gravity of the molten aluminum is 2.79 g / cm 3.

As such, buoyancy is generated in the sand core by the difference in specific gravity of the aluminum molten metal and the sand core during molten metal injection.

Thus, as shown in FIG. 3B, which is compared with FIG. 3A before the molten metal injection, the core 31 rises inclined with respect to the A and B contacts, and a burr 31a is generated in the material, so that the burr 31a is formed. It is difficult to remove, and the position of the port is unstable, causing material defects.

The present invention was created in order to solve the above problems, when the mold is closed by mounting the spring on the upper mold side, using the spring tension to prevent the injuries of the core using the mold to prevent the injury of the core The purpose is to provide.

1 is a schematic flowchart showing a cylinder head material production process.

Figure 2 is a schematic diagram showing the structure of a cylinder head mold according to the prior art.

Figure 3a is a schematic diagram showing the state of the core before the molten metal injection, Figure 3b is a schematic view showing a deformation state of the core after the molten metal injection in a view compared to Figure 3a.

Figure 4 is a schematic view showing the configuration of a mold employing the anti-floating device of the core according to the present invention.

FIG. 5 is a schematic cross-sectional view taken along line A-A in FIG. 4. FIG.

Figure 6 is an explanatory view explaining the theory that the anti-floating device of the core is employed in the mold.

<Description of the symbols for the main parts of the drawings>

61. Upper mold

62. Lower mold

63. Port Core

64. Core Print

65. Guide rod

66. Guide Block

67. Spring

68. Guide Bush

The mold employing the anti-floating device of the core of the present invention for achieving the above object, the upper mold; A lower mold coupled to the upper mold; A core set in the lower mold; A core print installed on one side of the core to hold the core; A guide rod penetrating the upper and lower molds and installed at an upper portion of the core print; A guide block installed at an upper end of the guide rod; A spring installed in the guide block, the upper end of the guide rod being fitted into an inner diameter thereof to press the core print to prevent injury of the core; And a guide bush installed at one side of the guide block to fix the spring.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a plan view schematically showing a mold employing the anti-floating device of the core according to the present invention, Figure 5 is a cross-sectional view shown along the line A-A in Figure 4 is shown.

Here, the description of the general mold is omitted, and only the configuration according to the features of the present invention will be described.

Referring to the drawings, the mold employing the anti-floating device of the core according to the present invention, the upper mold 61, the lower mold 62 coupled to the upper mold 61, and the lower mold 62 For example, the port core 63 of the cylinder head installed in the setting, the core print 64 installed on one side of the port core 63 to hold the port core 63, and the upper and lower molds 62 penetrate. And a guide rod 65 installed at an upper portion of the core print 64, a guide block 66 provided at an upper end of the guide rod 65, and a guide rod 66 disposed at an inner diameter thereof. The upper end of the) is inserted into the spring 67 provided to press the core print 64 to prevent the injuries of the port core 63, and a guide installed on one side of the guide block 66 for fixing the spring 67 It is configured to include a bush 68.

The tension of the spring 67 is larger than the buoyancy of the port core 63 so as not to rise of the port core 63.

Meanwhile, reference numeral 71, which is not described in FIGS. 4 and 5, represents a bolt, and 'L' represents a play between the spring 67 and the guide rod 65, respectively.

Referring to the operation of the mold employing the anti-floating device of the core according to the present invention having the configuration as described above are as follows. Here, description of the operation of the general mold will be omitted, and only the operation according to the features of the present invention will be described.

In the mold employing the anti-floating device of the core according to the present invention, the spring 67 is fixed to the upper mold 61 with excellent force and presses the core print 64 of the port core 63 of the cylinder head. This is to prevent the injury of the core (63). At this time, the tension of the spring 67 is greater than the buoyancy of the port core 63 to push the spring 67 using the gravity of the upper mold (61).

In more detail, the guide block is mounted on the upper mold 61, and the spring 67 is fitted to the guide block 66. After mounting the guide rod 65, the guide bush 68 is fixed.

The open operation of the mold thus mounted raises the upper mold 61 and the upper holder 69 to the upper side, and again raises the upper mold 61 by a stroke. Slide the loose piece (before, after, left, right) 70 outwards, and then take out the product.

The close operation of the mold is to close the loose piece (before, after, left and right) 70 inward, and lower the upper mold 61 by a stroke to meet the upper holder 69, and then the upper mold. 61 and the upper holder 69 are simultaneously lowered and closed, and then molten metal is injected.

As described above, the mold employing the anti-floating device of the core according to the present invention has the following effects.

When the mold is closed by mounting the spring on the upper mold side, the core is prevented from being injured by using the spring tension, for example, the port core of the cylinder head is prevented from being injured to suppress the occurrence of burrs and the safety of the port core position. By ensuring the performance of the cylinder head and the quality of the material can be improved.

Although the present invention has been described with reference to one embodiment (cylinder head mold) illustrated in the drawings, this is merely exemplary, and various modifications and equivalent embodiments thereof are possible to those skilled in the art. Will understand. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (2)

Upper mold; A lower mold coupled to the upper mold; A core set in the lower mold; A core print installed on one side of the core to hold the core; A guide rod penetrating the upper and lower molds and installed at an upper portion of the core print; A guide block installed at an upper end of the guide rod; A spring installed in the guide block, the upper end of the guide rod being fitted into an inner diameter thereof to press the core print to prevent injury of the core; And a guide bush installed on one side of the guide block to fix the spring. The method of claim 1, The tension of the spring is a mold employing a flotation prevention device of the core, characterized in that greater than the buoyancy of the core.