CN210702355U

CN210702355U - Automobile gear box sand core forming die

Info

Publication number: CN210702355U
Application number: CN201921699106.XU
Authority: CN
Inventors: 励建永
Original assignee: Ningbo Zhongfa Machinery Die Co ltd
Current assignee: Ningbo Zhongfa Machinery Die Co ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-06-09
Anticipated expiration: 2029-10-11

Abstract

The utility model relates to the technical field of sand core molds, in particular to a sand core forming mold of an automobile gear box body, which comprises an upper mold, a lower mold, an ejection mechanism, a cavity, a pouring gate and a first through hole; the ejection mechanism comprises an ejector rod, a bottom plate and an ejection cylinder, the ejector rod is matched in the first through hole in a vertically sliding mode, and the lower end of the ejector rod is connected with the ejection cylinder through the bottom plate; the upper end face of the lower die is concavely provided with a plurality of grooves, the left end face of the lower die is provided with an air inlet pipeline communicated with the grooves, the right end face of the lower die is provided with an air outlet pipeline communicated with the grooves, the lower end face of the lower die is connected with a sealing plate used for sealing the grooves, and the sealing plate is provided with a second through hole used for avoiding the movement of the ejector rod. High-temperature gas is introduced through the gas inlet pipeline to heat the lower die, so that the temperature in the cavity is raised, and the molding quality of the sand core is improved. In addition, low-temperature gas can be introduced into the gas inlet pipeline, so that the heat dissipation efficiency of the sand core is improved, and the working efficiency is improved.

Description

Automobile gear box sand core forming die

Technical Field

The utility model relates to a psammitolite mould technical field specifically is an automobile gear box psammitolite moulded die.

Background

The automobile gear box is used for installing an automobile speed change gear, and due to the complexity of the internal structure, a sand core is generally required to be used for filling when the automobile gear box is cast and molded.

In the prior art, when the sand core of the automobile gear box body is cast and molded, because the temperature in the cavity is far lower than that of the liquid sand, the temperature of the liquid sand is suddenly reduced after the liquid sand is just injected into the cavity, so that the fluidity of the liquid sand is reduced, cold shut is easily generated, and the quality of the sand core is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a car gearbox psammitolite moulded die to solve the not enough that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a sand core forming die for an automobile gear box body comprises an upper die, a lower die and an ejection mechanism, wherein a cavity for forming the sand core of the automobile gear box body is formed between the upper die and the lower die, a pouring channel for communicating the cavity is arranged on the upper die, and a first through hole for communicating the cavity is vertically and upwards arranged on the lower end surface of the lower die; the ejection mechanism comprises an ejector rod, a bottom plate positioned below the lower die and an ejection cylinder positioned below the lower die, the ejector rod is vertically matched in the first through hole in a sliding manner, and the lower end of the ejector rod is connected with an ejection rod of the ejection cylinder through the bottom plate; the lower end face of the lower die is concavely provided with a plurality of grooves, an air inlet pipeline used for communicating the grooves is arranged on the left end face of the lower die, an air outlet pipeline used for communicating the grooves is arranged on the right end face of the lower die, a sealing plate used for sealing the grooves is connected to the lower end face of the lower die, and a second through hole used for avoiding the movement of the ejector rod is formed in the sealing plate.

The beneficial effects of the utility model reside in that: the utility model has simple structure and reasonable layout; because under the effect of the sealing plate, the groove can be sealed to form a cavity, high-temperature gas can be introduced into the gas inlet pipeline, the high-temperature gas is discharged from the gas outlet pipeline after passing through the inside of the groove, and the lower die is heated during the period that the high-temperature gas passes through the groove, so that the temperature in the cavity is increased, the sudden drop of the temperature of liquid sand during casting is avoided, and the molding quality of the sand core is improved. In addition, after the liquid sand is solidified, low-temperature gas can be introduced into the gas inlet pipeline and then discharged from the gas outlet pipeline through the groove, so that the heat dissipation efficiency of the interior of the cavity is accelerated.

Preferably, the sealing plate is integrally provided with a mounting bracket. The advantages are that: the lower die can be fixedly installed through the installation frame.

Preferably, the lower surface of the sealing plate is connected with at least two limiting rods, limiting holes are formed in the positions, opposite to the limiting rods, of the bottom plate, and the limiting rods are matched with the limiting holes in a vertical sliding mode. The advantages are that: through the cooperation between gag lever post and the spacing hole, can improve the gliding precision from top to bottom of ejector pin avoids because of the ejector pin produces radial swing and accelerates the wearing and tearing of ejector pin surface and first through-hole inner wall at the upper and lower slip in-process.

Preferably, the lower end of the limiting rod is integrally provided with a limiting block for preventing the limiting hole from being separated from the limiting rod. The advantages are that: the limiting block can prevent the limiting hole from being separated from the limiting rod.

Preferably, a sealing ring is arranged between the upper surface of the sealing plate and the lower end surface of the lower die. The advantages are that: the sealing ring can improve the sealing performance of the groove.

Preferably, the lower surface of the sealing plate is provided with a drain hole communicated with the inside of the groove in a penetrating manner, and the drain hole is connected with a sealing bolt. The advantages are that: the water inside the groove can be drained by unscrewing the sealing bolt.

Preferably, an O-shaped sealing ring is arranged between the large head end of the sealing bolt and the sealing plate. The advantages are that: the sealing between the sealing bolt and the drain hole can be improved.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present invention;

fig. 2 is a schematic diagram of a three-dimensional explosion structure according to an embodiment of the present invention;

fig. 3 is an enlarged schematic perspective view of a lower mold according to an embodiment of the present invention;

fig. 4 is an enlarged schematic view of a sealing plate and a mounting bracket according to an embodiment of the present invention in a front view;

fig. 5 is a cross-sectional view taken along a-a in fig. 4.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present embodiments more clearly, and the protection scope of the present invention is not limited thereby.

Referring to fig. 1 to 5, in an embodiment of the present invention, an automobile gear box sand core forming die includes an upper die 1, a lower die 2 and an ejection mechanism, a cavity 4 for forming an automobile gear box sand core is formed between the upper die 1 and the lower die 2, a runner 11 for communicating the cavity 4 is arranged on the upper die 1, and a first through hole 21 for communicating the cavity 4 is vertically and upwardly arranged on a lower end surface of the lower die 2; the ejection mechanism comprises an ejector rod 31, a bottom plate 32 positioned below the lower die 2 and an ejection cylinder (the ejection cylinder is not shown in the drawing) positioned below the lower die 2, the ejector rod 31 is matched in the first through hole 21 in a vertical sliding manner, and the lower end of the ejector rod 31 is connected with an ejection rod of the ejection cylinder through the bottom plate 32; the lower end face of the lower die 2 is concavely provided with a plurality of grooves 22, the left end face of the lower die 2 is provided with an air inlet pipeline 5 used for communicating the grooves 22, the right end face of the lower die 2 is provided with an air outlet pipeline 6 used for communicating the grooves 22, the lower end face of the lower die 2 is connected with a sealing plate 7 used for sealing the grooves 22, and the sealing plate 7 is provided with a second through hole used for avoiding the movement of the ejector rod 31. The number of the grooves 22 is not limited, and is preferably sixteen in the embodiment, and the grooves are arranged in a 4 × 4 manner; the air inlet pipeline 5 is respectively communicated with the four grooves 22 on the left side through four branch pipes, the air outlet pipeline 6 is respectively communicated with the four grooves 22 on the right side through four branch pipes, and the adjacent two grooves 22 are communicated through the gaps 20.

In an embodiment, the sealing plate 7 is integrally provided with a mounting bracket 8, so that the lower die 2 can be mounted and fixed through the mounting bracket 8.

In an embodiment, the lower surface of the sealing plate 7 is connected with four limiting rods 71 (the number of the limiting rods 71 is at least two), the bottom plate 32 is provided with limiting holes 321 at positions opposite to the limiting rods 71, and the limiting rods 71 are slidably matched with the limiting holes 321 up and down. Through the spacing sliding fit between gag lever post 71 and spacing hole 321, can improve the gliding precision about ejector pin 31 avoids because ejector pin 31 produces radial swing and accelerates the wearing and tearing of ejector pin 31 surface and first through-hole 21 inner wall in the up-and-down sliding process to prolong their life.

In an embodiment, the lower end of the limiting rod 71 is integrally provided with a limiting hole 711, the limiting hole 321 is prevented from being separated from the limiting rod 71 through the limiting hole 711, and the stability of limiting sliding fit between the limiting rod 71 and the limiting hole 321 is ensured.

In an embodiment, a sealing ring (not shown in the drawings) is provided between the upper surface of the sealing plate 7 and the lower end surface of the lower mold 2, and the sealing ring can improve the sealing performance of the groove 22.

In the embodiment, a drainage hole 72 communicated with the inside of the groove 22 is formed through the lower surface of the sealing plate 7, and a sealing bolt 73 is connected in the drainage hole 72. Because the introduced high-temperature gas can be liquefied into water in the groove 22 and stored in the groove 22, the volume of the groove 22 is reduced, the gas accommodating capacity of the groove 22 is reduced, and the heating efficiency and the cooling efficiency of the cavity 4 are reduced. The sealing bolt 73 can be periodically unscrewed to drain the water inside the groove 22.

In an embodiment, an O-ring 74 is disposed between the large end of the sealing bolt 73 and the sealing plate 7, so as to improve the sealing performance between the sealing bolt 73 and the drainage hole 72.

The working principle is as follows: firstly, the lower die 2 is installed and fixed through the installation frame 8, and then die assembly operation is carried out; after the die is closed, high-temperature gas (150-250 ℃) is introduced into the gas inlet pipeline 5, the high-temperature gas sequentially passes through the gas inlet pipeline 5, the grooves 22 (the adjacent two grooves 22 are communicated through the gaps 20) and the gas outlet pipeline 6, and the high-temperature gas exchanges heat with the lower die 2 during passing through the grooves 22, so that the temperature in the cavity 4 is increased, the cold shut phenomenon is avoided, the heating efficiency is high, and the heating speed is high; then, injecting liquid sand into the cavity 4 through the pouring gate 11 by a sand shooting machine, and after solidification and molding, sequentially introducing air into the air inlet pipeline 5 through the air and the air, the air inlet pipeline 5, the grooves 22 (the adjacent two grooves 22 are communicated through the gap 20) and the air outlet pipeline 6, so as to take away a large amount of heat, accelerate the cooling efficiency of the sand core and improve the working efficiency; and finally, opening the upper die 1, and ejecting the sand core through the ejection mechanism.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A sand core forming die for an automobile gear box body comprises an upper die (1), a lower die (2) and an ejection mechanism, wherein a cavity (4) for forming the sand core of the automobile gear box body is formed between the upper die (1) and the lower die (2), a pouring gate for communicating the cavity (4) is arranged on the upper die (1), and a first through hole (21) for communicating the cavity (4) is vertically and upwards arranged on the lower end surface of the lower die (2); the ejection mechanism comprises an ejector rod (31), a bottom plate (32) positioned below the lower die (2) and an ejection cylinder positioned below the lower die (2), the ejector rod (31) is matched in the first through hole (21) in a vertical sliding manner, and the lower end of the ejector rod (31) is connected with an ejection rod of the ejection cylinder through the bottom plate (32); the novel sealing device is characterized in that a plurality of grooves (22) are formed in the upper portion of the lower end face of the lower die (2) in a concave mode, an air inlet pipeline (5) used for communicating the grooves (22) is arranged on the left end face of the lower die (2), an air outlet pipeline (6) used for communicating the grooves (22) is arranged on the right end face of the lower die (2), a sealing plate (7) used for sealing the grooves (22) is connected to the lower end face of the lower die (2), and a second through hole used for avoiding the ejector rod (31) to move is formed in the sealing plate (7).

2. The sand core forming die for the automobile gear box body as claimed in claim 1, wherein a mounting frame (8) is integrally provided on the sealing plate (7).

3. The sand core forming die for the automobile gear box body as claimed in claim 1, wherein at least two limiting rods (71) are connected to the lower surface of the sealing plate (7), limiting holes (321) are formed in positions of the bottom plate (32) opposite to the limiting rods (71), and the limiting rods (71) are matched with the limiting holes (321) in a vertical sliding mode.

4. The sand core molding die for an automobile gear box according to claim 3, wherein a stopper (711) for preventing the stopper hole (321) from being separated from the stopper rod (71) is integrally provided at the lower end of the stopper rod (71).

5. The sand core molding die for an automobile gear box according to claim 1, wherein a seal ring is provided between the upper surface of the seal plate (7) and the lower end surface of the lower die (2).

6. The sand core molding die for the automobile gear box body as claimed in claim 1, wherein a drain hole (72) communicating with the inside of the recess (22) is formed through the lower surface of the sealing plate (7), and a sealing bolt (73) is connected to the drain hole (72).

7. The sand core forming die for the automobile gear box body as claimed in claim 6, wherein an O-shaped sealing ring (74) is provided between the large end of the sealing bolt (73) and the sealing plate (7).