CN215508872U

CN215508872U - Mold for improving casting process yield of automobile gear shifting fork

Info

Publication number: CN215508872U
Application number: CN202121818837.9U
Authority: CN
Inventors: 王新乐; 王永涝; 任现伟
Original assignee: Luoyang Gucheng Machinery Co ltd
Current assignee: Luoyang Gucheng Machinery Co ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2022-01-14
Anticipated expiration: 2031-08-05

Abstract

A mold for improving the casting process yield of an automobile gear shifting fork comprises a mold positive pressure plate and a mold negative pressure plate, wherein the mold positive pressure plate and the mold negative pressure plate are vertically and symmetrically arranged, and a shifting fork cavity and a pouring mechanism cavity are arranged on the positive pressure plate; the number of the shifting fork cavities is three, the first shifting fork cavity and the second shifting fork cavity are vertically placed back to back, and the third shifting fork cavity and the second shifting fork cavity are vertically placed face to face; the pouring mechanism cavity comprises a pouring cup, a cross gate, a riser, a sprue and a water inlet; the sprue cup is arranged above the shifting fork cavity; the horizontal pouring gate is horizontally arranged below the pouring cup and is communicated with the pouring cup; and the riser is arranged on the top of the beam of the shifting fork cavity and is communicated with the corresponding shifting fork cavity. The utility model reduces the number of risers of the existing mould, increases the number of castings and improves the technological yield of the castings; the riser sets up at the crossbeam top of shift fork die cavity, does benefit to the feeding, and the shift fork die cavity bottom increases the water inlet, guarantees the stability that the molten iron filled the type, has improved the internal quality of foundry goods.

Description

Mold for improving casting process yield of automobile gear shifting fork

Technical Field

The utility model belongs to the technical field of automobile gear shifting fork casting dies, and particularly relates to a die for improving the casting process yield of an automobile gear shifting fork.

Background

The shifting fork is an important part in the process of realizing shifting of the automobile gearbox, is positioned at the lower end of the speed changing handle and is connected with the speed changing handle, and in the running process of an automobile, the shifting fork is used for shifting the speed changing gear to change the input and output speed ratio so as to realize the shifting process. At present, the shift fork of shifting adopts DISA perpendicular line damp film sand casting more, and shift fork foundry goods size of shifting is: the length is 370mm, the width is 176mm, the height is 46mm, and the template size of its production line is: the length is 650mm, wide 535mm, the current shift fork mould of shifting adopts the level to place the technology usually, to this shift fork mould of shifting according to traditional handicraft, can place two castings at most, need six rising heads at least can satisfy the requirement, lead to casting process yield low, every side of casting all has remaining riser neck, it is big to cause the grinding task volume, low in production efficiency, the outward appearance uniformity of product is relatively poor simultaneously, the inherent quality of product is unstable, make manufacturing cost also corresponding increase.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a die for improving the casting process yield of an automobile gear-shifting fork.

The purpose of the utility model can be realized by adopting the following technical scheme: a mould for improving the casting process yield of an automobile gear shifting fork comprises a mould positive pressure plate and a mould negative pressure plate, wherein the mould positive pressure plate and the mould negative pressure plate are vertically and symmetrically arranged, and a shifting fork cavity and a pouring mechanism cavity are arranged on the mould positive pressure plate; the number of the shifting fork cavities is three, and the shifting fork cavities are vertically arranged in the positive pressure plate of the mold, wherein the first shifting fork cavity and the second shifting fork cavity are vertically placed back to back, the third shifting fork cavity and the second shifting fork cavity are vertically placed face to face, and the height of the third shifting fork cavity is lower than the horizontal height of the first shifting fork cavity and the second shifting fork cavity; the pouring mechanism cavity is arranged at the upper parts of the three shifting fork cavities and comprises a pouring cup, a cross gate, a riser, a sprue and a water inlet; the sprue cup is arranged above the three shifting fork cavities; the horizontal pouring gate is horizontally arranged below the pouring cup and is communicated with the pouring cup; the three risers are respectively arranged on the top beams of the three shifting fork cavities and communicated with the corresponding shifting fork cavities; the two straight pouring channels are respectively and vertically arranged below the cross pouring channel, one straight pouring channel is arranged between the first shifting fork cavity and the second shifting fork cavity and communicated with a riser of a top cross beam of the first shifting fork cavity, and the other straight pouring channel is arranged on the right side of the third shifting fork cavity and communicated with a riser of a top cross beam of the third shifting fork cavity; the water inlets are respectively arranged at the bottoms of the three shifting fork cavities and communicated with the three shifting fork cavities, the water inlets at the bottoms of the first shifting fork cavity and the second shifting fork cavity are respectively communicated with a sprue arranged between the first shifting fork cavity and the second shifting fork cavity, and the water inlet at the bottom of the third shifting fork cavity is communicated with the sprue on the right side of the third shifting fork cavity.

The die positive pressure plate and the die reverse pressure plate are rectangular bottom plates with the same size, two ends of the die positive pressure plate and the die reverse pressure plate are respectively and symmetrically provided with a positioning pin hole, and the positions of the positioning pin holes on the die positive pressure plate and the die reverse pressure plate are corresponding to each other.

The riser is spherical and is communicated with the three risers through a cross gate.

The pouring cup is of a funnel-shaped structure which is axially split.

The cross sections of the horizontal pouring channel and the straight pouring channel are both in a trapezoidal shape, and the ratio of the cross sections of the horizontal pouring channel to the cross sections of the straight pouring channel is 1: 0.6.

The process of the utility model comprises the following steps: the method comprises the steps of combining a positive pressure plate and a negative pressure plate of a mold, passing through a positioning pin hole through a positioning pin for mold closing and positioning, pouring molten iron through a sprue cup, enabling the molten iron to flow into cross runners on two sides in a shunting manner, enabling the molten iron to enter three risers through the cross runners, enabling the risers to become overheated risers, enabling the molten iron to flow into three shifting fork cavity bodies, then continuously flowing into two straight runners, enabling the molten iron to flow into the bottoms of the three shifting fork cavity bodies through three water inlets respectively, adjusting the flow rates of the top riser and the bottom water inlet of the shifting fork cavity bodies through calculation to guarantee the stability of molten iron mold filling, avoiding scouring of the cavity bodies to form sand slag holes, providing good feeding conditions for castings through the riser on the top of each shifting fork cavity body, and enabling the interior of the castings to be free of defects.

The utility model has the beneficial effects that:

1. the number of risers of the existing die is reduced, the number of castings is increased, the technological yield of the castings is obviously improved, the production cost is effectively reduced, and the production efficiency is improved.

2. The riser is arranged at the top of the cross beam of the shifting fork cavity, so that the condition of being more beneficial to feeding is created, and the internal quality of the casting is better ensured.

3. The water inlet is added at the bottom of the shifting fork cavity, so that the stability of molten iron mold filling is ensured, the appearance defect of a product is reduced, and the quality of a casting is improved.

Drawings

FIG. 1 is a schematic structural view of a positive pressure plate of the mold of the present invention;

FIG. 2 is a schematic view of a mold back-pressure plate structure according to the present invention;

FIG. 3 is a cross-sectional view of the runner A-A of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the sprue B-B of FIG. 1;

FIG. 5 is a schematic structural diagram of a positive pressure plate of a conventional mold;

FIG. 6 is a schematic view of a structure of a back-pressure plate of a conventional mold;

the labels in the figure are: 1. pouring cup, 2, horizontal runner, 3, riser, 4, sprue, 5, water inlet, 6, locating pin hole, 7, first shift fork die cavity, 8, second shift fork die cavity, 9, third shift fork die cavity.

Detailed Description

The following detailed description of embodiments of the utility model is provided in connection with the accompanying drawings.

As shown in figures 1, 2, 3, 4, 5 and 6, a casting tool for improving the automobile gear shifting forkThe mould for the technical product rate comprises a mould positive pressure plate and a mould negative pressure plate; the mould positive pressure plate and the mould reverse pressure plate are rectangular bottom plates with the same size and are vertically and symmetrically arranged, two ends of the mould positive pressure plate and the mould reverse pressure plate are respectively and symmetrically provided with a positioning pin hole 6, the positions of the positioning pin holes 6 on the mould positive pressure plate and the mould reverse pressure plate are corresponding, and the mould positive pressure plate is provided with a shifting fork cavity and a pouring mechanism cavity; the number of the shifting fork cavities is three, the shifting fork cavities are vertically arranged in a positive die plate of the die, a first shifting fork cavity 7 and a second shifting fork cavity 8 are vertically arranged back to back, a third shifting fork cavity 9 and the second shifting fork cavity 8 are vertically arranged face to face, the height of the third shifting fork cavity is lower than the horizontal height of the first shifting fork cavity 7 and the horizontal height of the second shifting fork cavity 8, the weight of a casting of the shifting fork in the embodiment is 2.94Kg, the length, the width and the height are 370mm, 176mm and 46mm, the height of the third shifting fork cavity 9 on the positive die plate of the die is offset 36mm relative to the lower part of the first shifting fork cavity 7 and the second shifting fork cavity 8, and the design is designed to save space and facilitate the placement of the third shifting fork cavity 9; the pouring mechanism cavity is arranged at the upper parts of the three shifting fork cavities and comprises a pouring cup 1, a cross gate 2, a riser 3, a sprue 4 and a water inlet 5; the pouring cup 1 is arranged above the three shifting fork cavities, is of a funnel-shaped structure with an axial split, and is convenient for smooth pouring of molten iron; the horizontal pouring gate 2 is horizontally arranged below the pouring cup 1 and communicated with the pouring cup 1; the three risers 3 are spherical risers, the total number of the three risers is three, the three risers are respectively arranged on top beams of three shifting fork cavities and are communicated with the corresponding shifting fork cavities, meanwhile, the three risers 3 are communicated with each other through a cross runner 2, each shifting fork cavity only needs one spherical riser for feeding, feeding conditions are facilitated, and the internal quality of a casting is better guaranteed; the two straight runners 4 are respectively vertically arranged below the cross runner 2, one of the two straight runners is arranged between the first shifting fork cavity 7 and the second shifting fork cavity 8 and communicated with a riser 3 of a top cross beam of the first shifting fork cavity 7, and the other straight runner is arranged on the right side of the third shifting fork cavity 9 and communicated with the riser 3 of the top cross beam; the cross sections of the horizontal pouring channel and the straight pouring channel are set asThe trapezoidal shape, the smaller the runner surface area of trapezoidal shape, can reduce the heat loss, also easier drawing of patterns, in this embodiment, the cross-sectional area of the horizontal runner is 195 mm^2,The cross-sectional area of the sprue is 120 mm^2,And the cross-sectional area ratio of the cross gate to the straight gate is 1:0.6, and tests show that: when the cross section area of the horizontal pouring channel of the casting is 1.6 times larger than that of the straight pouring channel, metal liquid floating slag can be effectively prevented from entering a casting cavity, so that the generation of casting slag hole defects is avoided; the water inlet 5 totally has three places, set up respectively in the bottom of three shift fork die cavity to be linked together with three shift fork die cavity, the water inlet 5 of first shift fork die

cavity

7 and 8 bottoms of second shift fork die cavity respectively with set up 4 intercommunications of sprue between the two, the water inlet 5 of 9 bottoms of third shift fork die cavity communicates with 4 of sprue on its right side, water inlet 5 sets up the purpose and adopts under the prerequisite of rising head 3 feeding at shift fork die cavity top, for preventing that the top from erodeing easily produce the sand hole defect, increase water inlet 5 in shift fork die cavity bottom promptly, through calculating flow distribution, the bottom adopts the thin slice to go into water, greatly reduced the production of appearance defects such as sand hole and cinder hole.

The specific process implementation process of the utility model is as follows: firstly, a mould positive pressure plate and a mould negative pressure plate are combined, positioning pins penetrate through positioning pin holes 6 in the mould positive pressure plate and the mould negative pressure plate to carry out mould closing and positioning, then molten iron is poured in through a pouring cup 1, and is shunted to enter cross runners 2 on two sides of the pouring cup 1 and enter three risers 3 through the cross runners 2, so that the risers 3 become overheating risers, the molten iron continuously flows into three shifting fork type cavities and then flows into two straight runners 4, and simultaneously the molten iron also flows into the bottoms of the three shifting fork type cavities through three water inlets 5 respectively, the stability of molten iron mould filling is ensured by calculating and adjusting the flow rates of the top risers 3 and the bottom water inlets 5 of the shifting fork type cavities, and the sand slag holes formed in the shifting fork type cavities are avoided; the riser 3 at the top of each shifting fork cavity provides a good feeding condition for the casting, the purpose of no defect inside the casting is realized, the horizontal space of the template is saved by the mode that the three shifting fork cavities are vertically arranged on the mold, and compared with the existing mode that two shifting fork cavities are arranged in the horizontal direction, the yield of the casting process is improved, the production efficiency of enterprises is correspondingly improved, and the production cost is effectively reduced.

The detailed parts of the utility model are not prior art, the common general knowledge of the specific structures and characteristics of the embodiments is not described, and the same similar parts can be referred to each other. The utility model discloses a have been used in this enterprise, respond well, the suggestion is promoted.

Claims

1. The utility model provides an improve mould of car shift fork casting process yield, includes mould forward clamp plate and mould back plate, characterized by: the mold positive pressure plate and the mold back pressure plate are vertically and symmetrically arranged, and a shifting fork cavity and a pouring mechanism cavity are arranged on the mold positive pressure plate; the number of the shifting fork cavities is three, the shifting fork cavities are vertically arranged in a positive pressure plate of the mold, a first shifting fork cavity (7) and a second shifting fork cavity (8) are vertically placed back to back, a third shifting fork cavity (9) and the second shifting fork cavity (8) are placed in a vertical surface opposite mode, and the height of the third shifting fork cavity is lower than the horizontal height of the first shifting fork cavity (7) and the second shifting fork cavity (8); the pouring mechanism cavity is arranged at the upper parts of the three shifting fork cavities and comprises a pouring cup (1), a cross gate (2), a riser (3), a sprue (4) and a water inlet (5); the sprue cup (1) is arranged above the three shifting fork cavities; the horizontal pouring gate (2) is horizontally arranged below the pouring cup (1) and is communicated with the pouring cup (1); the three risers (3) are respectively arranged on the tops of the cross beams of the three shifting fork cavities and communicated with the corresponding shifting fork cavities; the two straight pouring channels (4) are respectively vertically arranged below the cross pouring channel (2), one of the straight pouring channels is arranged between the first shifting fork cavity (7) and the second shifting fork cavity (8) and communicated with a riser (3) at the top of a cross beam of the first shifting fork cavity (7), and the other straight pouring channel is arranged on the right side of the third shifting fork cavity (9) and communicated with the riser (3) at the top of the cross beam; the water inlets (5) are three and are respectively arranged at the bottoms of the three shifting fork cavities and communicated with the three shifting fork cavities, the water inlets (5) at the bottoms of the first shifting fork cavity (7) and the second shifting fork cavity (8) are respectively communicated with the sprue (4) arranged between the first shifting fork cavity and the second shifting fork cavity, and the water inlets (5) at the bottom of the third shifting fork cavity (9) are communicated with the sprue (4) on the right side of the third shifting fork cavity.

2. The mold for improving the casting process yield of the automobile gear shifting fork according to claim 1, which is characterized in that: the mould positive pressure plate and the mould reverse pressure plate are rectangular bottom plates with the same size, two ends of the mould positive pressure plate and two ends of the mould reverse pressure plate are respectively and symmetrically provided with a positioning pin hole (6), and the positions of the positioning pin holes (6) on the mould positive pressure plate and the mould reverse pressure plate are corresponding.

3. The mold for improving the casting process yield of the automobile gear shifting fork according to claim 1, which is characterized in that: the riser (3) is a spherical riser, and the three risers (3) are communicated with each other through the cross gate (2).

4. The mold for improving the casting process yield of the automobile gear shifting fork according to claim 1, which is characterized in that: the pouring cup (1) is of a funnel-shaped structure which is axially split.

5. The mold for improving the casting process yield of the automobile gear shifting fork according to claim 1, which is characterized in that: the cross sections of the horizontal pouring channel (2) and the straight pouring channel (4) are both in a trapezoidal shape, and the ratio of the cross sections of the horizontal pouring channel (2) to the cross sections of the straight pouring channel (4) is 1: 0.6.