JP3415685B2 - Injection sleeve for die casting machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection sleeve for a die casting machine, and more specifically, in an injection sleeve incorporated in a horizontal injection type die casting machine, a melting loss (corrosion by the molten metal) caused by pouring at a position below a pouring port. The present invention relates to an improvement of an injection sleeve in which a cooling water chamber is formed for the purpose of preventing the above.

[0002]

2. Description of the Related Art When a cooling water chamber for preventing melting damage is formed at a lower position of a pouring port of an injection sleeve, generally, as shown in FIGS. 2 and 3, a lower position 1 of the pouring port 2 of a sleeve body 1 is formed.
a A concave portion 3 is formed on the outer side, and the concave portion 3 is covered and sealed with a lid plate 4 to form a cooling water chamber 5, and at the same time, four circumferences of the lid plate 4 are welded to the sleeve main body 1 to form a cooling water chamber 5. Watertightness is maintained.

However, in the vicinity of the lower position 1a of the pouring port 2, the temperature rises due to the heat input from the molten metal each time the pouring is performed, whereas the cover plate 4 separated by the cooling water chamber 5 has almost the same temperature. Since there is no change, there is a temperature difference between the vicinity of the lower position 1a of the pouring port 2 and the cover plate 4. Therefore, a difference occurs between the amount of thermal deformation near the lower position 1a of the pouring port 2 and the amount of thermal deformation of the cover plate 4, and the welded portion of the cover plate 4, particularly the welding at the direction orthogonal to the axial direction of the sleeve body. In some cases, stress concentration occurred in the portion 7a, the welded portion was cracked, and the cooling water in the cooling water chamber leaked to the outside.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is devised so that stress concentration does not occur at the welded portion between the sleeve body and the cover plate for a long period of time. It is intended to provide an injection sleeve for a die casting machine capable of preventing cracks in a welded portion of a cover plate.

[0005]

An injection sleeve for a die casting machine according to the present invention that achieves the above object has a lid formed by forming a concave portion outside a lower position of a pouring port of a sleeve body, and the concave portion having a substantially gutter shape. The cover plate is hermetically sealed and the lid plate is welded to the sleeve body to form a cooling water chamber for preventing melting damage, and a groove is formed on the outer surface of the lid plate in a direction orthogonal to the axial direction of the sleeve body. At the same time, the concave grooves are arranged and formed at positions near both ends of the sleeve body in a direction orthogonal to the axial direction of the sleeve body. Further, the wall thickness of the cover plate in the recessed groove portion is formed to be substantially the same as or slightly thinner than the depth of the welded portion where the cover plate is welded.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The sleeve body 1 is made of the same material as the conventional one and is formed in the same manner as the conventional one, and the pouring port 2 is formed on one end side.

On the outside of the lower portion 1a of the pouring port 2 of the sleeve body 1, that is, on the outer portion of the sleeve body 1 located below the pouring port 2, there is formed a recess 3 having a required depth to be the cooling water chamber 5. The hole 3 is formed by punching, and the concave portion 3 is covered and sealed with a lid plate 4 and the lid plate 4 is welded to the sleeve body 1 to form a cooling water chamber 5 for preventing melting damage.

The lid plate 4 is made of the same material as the sleeve body 1 and is slightly larger than the outer periphery of the recess 3 in the sleeve body 1.
Is formed in a rectangular flat plate shape that is long in the axial direction of the sleeve body 1 and is formed in a substantially gutter shape in accordance with the outer shape of the sleeve body 1, and the fitting step portion 6 formed around the recess 3 has an outer surface and a surface of the sleeve body 1. The recesses 3 are fitted in one shape to cover the recesses 3, and the entire four circumferences of the cover plate 4 are welded to the sleeve body 1 by welding 7a, 7b to form a watertight cooling water chamber 5.

Further, on the outer surface of the cover plate 4, at positions near both ends in the axial direction of the sleeve body 1, that is, in the vicinity of both ends orthogonal to the longitudinal direction of the cover plate 3, in the direction orthogonal to the axial direction of the sleeve body 1. Two concave grooves 8 are formed in total.

The recessed groove 8 is formed by the four-circle welded portions 7a and 7b of the cover plate 4.
In particular, the stress is concentrated in the vicinity of the lower position 1a of the pouring port 2 due to the thermal deformation, so that the stress concentrated in the welded portions 7a, 7a orthogonal to the axial direction of the sleeve body 1 is relaxed. The plate 4 is formed on the outer side surface of the plate 4 at positions near both ends of the sleeve body 1 in the direction orthogonal to the axial direction of the sleeve body 1 in a direction orthogonal to the axial direction of the sleeve body 1.

At this time, the stress relaxation effect of the concave groove 8 is
If the corner portion 8a is formed in an arc shape instead of a right angle shape, the thickness L ₁ of the lid plate 4 (distance from the groove 8 to the inner surface 10 of the sleeve) in the groove 8 portion is welded to the lid plate 4. The welded portions 7a, 7a having the same depth or slightly thinner depth L ₂ have a higher mitigation effect, and when the width L ₃ is narrower, the wall thickness L ₁ is thinner. On the contrary, when the width L ₃ of the concave groove 8 is wide, the relaxation effect is higher when the wall thickness L ₁ is formed thicker.

When the cooling water is supplied and circulated in the cooling water chamber 5, the water passage (doorway) communicating with the cooling water chamber 5 is provided with the cover plate 4.
Alternatively, the cooling water inlet / outlet 9 communicating with the cooling water chamber 5 may be formed on the end surface 1 ′ of the sleeve body 1 as in the illustrated embodiment.
(Water channel) may be formed.

[0013]

Since the injection sleeve for a die casting machine of the present invention is constructed in this way, even if there is a difference between the amount of thermal deformation near the lower position of the pouring port and the amount of thermal deformation of the lid plate every time pouring is performed. , The concave groove formed on the outer surface of the cover plate near both ends of the sleeve body in the direction orthogonal to the axial direction of the sleeve body relieves stress particularly concentrated on the welded portions 7a, 7a in the direction orthogonal to the axial direction of the sleeve body. As a result, it is possible to prevent cracks in the welded portion of the lid plate for a long period of time, and therefore the cooling water in the cooling water chamber does not leak out for a long period of time.

By the way, in the conventional case, the speed is 1,000 when the speed is high.
After approximately 2,000 shots, the welded portions 7a, 7a on the side orthogonal to the axial direction of the sleeve body cracked and the cooling water in the cooling water chamber leaked out after about 2,000 shots. When such an injection sleeve was used, cooling water did not leak over 100,000 shots.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of implementing the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a sectional view taken along line (X)-(X) of FIG.

FIG. 4 is a partially enlarged sectional view of FIG.

[Explanation of symbols] 1: Sleeve body 2: Pouring spout
3: Recessed portion 4: Lid plate 5: Cooling water chamber
6: Fitting step portions 7a and 7b: Welded portion 8: Recessed groove
9: Doorway 10: Inner surface of sleeve

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B22D 17/20 B29C 45/00

Claims (3)

(57) [Claims] 1. An injection sleeve for a die casting machine, wherein a cooling water chamber for preventing melting damage due to pouring is formed at a lower position of a pouring port, and a recess is formed outside a lower position of the pouring port of a sleeve body. , The concave portion is covered and sealed with a cover plate formed in a substantially gutter shape, and the cover plate is welded to the sleeve body to form a cooling water chamber for preventing melting damage, and a shaft of the sleeve body is provided on an outer surface of the cover plate. An injection sleeve for die casting machines, characterized by having a groove formed in a direction orthogonal to the direction. 2. The injection sleeve for a die casting machine according to claim 1, wherein the recessed grooves are formed at positions near both ends of the outer surface of the cover plate, which are orthogonal to the axial direction of the sleeve body. . 3. The wall thickness of the lid plate in the groove portion is
The injection sleeve for a die casting machine according to claim 1 or 2, wherein the lid plate is formed to have a thickness that is substantially the same as or slightly thinner than a depth of a welded portion.