Die-cast connecting rod body ejection method, die-cast connecting rod cavity structure and die-casting mold

Abstract

The present invention relates to a die-cast connecting rod body ejection method, a die-cast connecting rod cavity structure and a die-casting mold. A plurality of ejection structures are arranged on the connecting rod body. The ejection structures include a slag collecting bag and a connecting rib. The slag collecting bag serves as the ejection position of the ejector pin. One end of the connecting rib is connected to the slag collecting bag, and the other end is connected to the large head processing surface and the small head outer wall of the connecting rod body. The cross section of the connecting rib is a T-shaped structure. The technical solution can avoid leaving traces such as convex points on the connecting rod body casting and maintain the dynamic balance performance of the connecting rod body.

Description

Technical Field

[0001] The invention relates to the field of connecting rod die casting, in particular to a die casting connecting rod body ejection method, a die casting connecting rod cavity structure and a die casting mold. Background Art

[0002] The common processing methods for engine connecting rod casting are casting and die casting. The die casting mold is divided into a movable mold and a fixed mold. The movable mold is provided with a flow channel and a casting cavity connected to the flow channel. Although the cavity for forming the connecting rod body is partly on the movable mold and partly on the fixed mold, in order to facilitate demoulding of the casting, the casting will be reserved on the movable mold after forming, and the casting and the flow channel will be ejected synchronously by an ejector pin.

[0003] In order to eject the casting, the ejection pins are located at the big end of the connecting rod, the small end of the connecting rod and the connecting rib plate.

[0004] The ejector pin ejection position will form a protrusion during the casting process, affecting the dynamic balance performance of the product. Summary of the invention

[0005] The invention aims at the technical problems existing in the prior art and provides a die-cast connecting rod body ejection method, a die-cast connecting rod cavity structure and a die-casting mold.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A die-cast connecting rod body ejection method, wherein a plurality of ejection structures are arranged on the connecting rod body, wherein the ejection structures include a slag collecting bag and a connecting rib, and the slag collecting bag serves as an ejection position of an ejector pin;

[0008] One end of the connecting rib is connected to the slag collecting bag, and the other end is connected to the large end processing surface and the small end outer wall of the connecting rod body;

[0009] The cross section of the connecting rib is a T-shaped structure.

[0010] A die-cast connecting rod cavity structure, comprising a connecting rod body cavity opened on a movable mold, wherein one end of the connecting rod body cavity is used for forming a connecting rod big end, the other end is used for forming a connecting rod small end, and the middle part is used for forming a connecting rod rib plate;

[0011] The connecting rod big end cavity includes two protrusions for fitting with the connecting rod cover and a bearing bush mounting groove between the two protrusions.

[0012] The fitting surfaces of the two protrusions and the connecting rod cover, the inner side surface of the bearing bush installation groove and the outer side wall of the connecting rod small end are all connected with grooves, and the slag collecting bag cavity is connected through the grooves;

[0013] The bottom of the slag collecting bag cavity is provided with a mounting hole for ejecting an ejector pin.

[0014] It is further defined that a convex cavity is provided between the inner side surface of the bearing shell mounting groove and the outer side surface of the connecting rod small end and the slag collecting bag, and a mounting hole for ejection of an ejector pin is provided at the bottom of the convex cavity.

[0015] It is further defined that the slag collecting bag cavity is connected to an exhaust duct.

[0016] A die-casting mold comprises a die-casting connecting rod body cavity structure.

[0017] A die-cast connecting rod blank is formed by adopting a die-cast connecting rod cavity structure.

[0018] The beneficial effects of the present invention are:

[0019] Cancel the ejector pin position on the product to avoid abnormal leveling and weight distribution caused by different weights of the product;

[0020] In order to ensure balanced and effective ejection of the product, ejector structures should be arranged at the big head and small head of the product respectively. After calculation, the clamping force of the big head will be greater than that of the small head, so 3 ejector structures are added to the big head and 2 to the small head.

[0021] According to the size of the product and the size of the clamping force, the size of the ejector structure and the size of the T-shaped connecting rib position need to be appropriately adjusted;

[0022] Design the slag bag ejection structure, and use T-shaped connecting ribs at the connection between the slag bag and the product. The use of T-shaped connecting ribs can ensure that there is no residue after the slag bag is knocked out, and can also ensure that the product will not collapse after the slag bag is knocked out. The most important thing is to ensure that the ejector force can be fully transferred to the product to assist in its smooth demolding. The side of the T-shaped connecting rib is straightened 2-4mm and then increased by 25 degrees. It is connected to the slag bag to ensure that the ejection force of the slag bag is fully transferred to the product to assist in its smooth demolding, and the fillet should be appropriately increased to avoid stress concentration;

[0023] Calculate the product's holding force. The slag ladle ejection force must be greater than the product's holding force.

[0024] Three ejection structures need to be designed at the large end of the product, arranged in a triangle, and two forced holding structures need to be designed at the small end, distributed at 45 degrees;

[0025] An ejector pin needs to be added to the slag bag connected to the ejection structure, which is a kinetic energy mechanism of the ejection structure, and an exhaust mechanism is provided at the edge.

[0026] The ejector mounting hole position of the ejector pin is moved into the slag bag cavity and the convex point cavity, and the ejector pin position is formed on the slag bag and the convex point. The slag bag cavity is connected with the connecting rod big head cavity and the connecting rod small head cavity through the groove. After the casting is formed, a connecting rib for connecting the slag bag mold and the casting will be formed in the groove as a force transmission part. When the slag bag is ejected, the casting is brought out through the connecting rib to achieve demoulding.

[0027] Since the two protrusions in the connecting rod big end cavity for fitting with the connecting rod cover and the bearing mounting grooves between the two protrusions are both later cutting surfaces, the outer wall of the connecting rod small end is also used as an outer surface for easy processing. The connecting ribs there can be cut off together when cutting the runner. The connecting ribs can be cut off during the later processing process, which can avoid leaving traces such as bumps on the connecting rod body casting and maintain the dynamic balance performance of the connecting rod body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the die-cast connecting rod blank of the present invention;

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] Connecting rod big end 1, connecting rod small end 2, connecting rod rib plate 3, protruding part 4, bearing shell mounting groove 5, connecting rib 6, slag collecting bag 7, protruding point 8, ejector pin position 9. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] like Figure 1 As shown, a die-cast connecting rod cavity structure includes a connecting rod body cavity opened on a movable mold, one end of the connecting rod body cavity is used for forming the connecting rod big end, the other end is used for forming the connecting rod small end, and the middle part is used for forming the connecting rod rib plate;

[0033] The connecting rod big end cavity includes two protrusions for fitting with the connecting rod cover and a bearing bush mounting groove between the two protrusions.

[0034] The fitting surfaces of the two protrusions and the connecting rod cover, the inner side surface of the bearing bush installation groove and the outer side wall of the connecting rod small end are all connected with grooves, and the slag collecting bag cavity is connected through the grooves;

[0035] The bottom of the slag collecting bag cavity is provided with a mounting hole for ejecting an ejector pin.

[0036] It is further defined that a convex cavity is provided between the inner side surface of the bearing shell mounting groove and the outer side surface of the connecting rod small end and the slag collecting bag, and a mounting hole for ejection of an ejector pin is provided at the bottom of the convex cavity.

[0037] It is further defined that the slag collecting bag cavity is connected to an exhaust duct.

[0038] A die-casting mold comprises a die-casting connecting rod body cavity structure.

[0039] A die-cast connecting rod blank is formed by adopting a die-cast connecting rod cavity structure.

[0040] The beneficial effects of the present invention are:

[0041] Cancel the ejector pin position on the product to avoid abnormal leveling and weight distribution caused by different weights of the product;

[0042] In order to ensure balanced and effective ejection of the product, ejector structures should be arranged at the big head and small head of the product respectively. After calculation, the clamping force of the big head will be greater than that of the small head, so 3 ejector structures are added to the big head and 2 to the small head.

[0043] According to the size of the product and the size of the clamping force, the size of the ejector structure and the size of the T-shaped connecting rib position need to be appropriately adjusted;

[0044] Design the slag bag ejection structure, and use T-shaped connecting ribs at the connection between the slag bag and the product. The use of T-shaped connecting ribs can ensure that there is no residue after the slag bag is knocked out, and can also ensure that the product will not collapse after the slag bag is knocked out. The most important thing is to ensure that the ejector force can be fully transferred to the product to assist in its smooth demolding. The side of the T-shaped connecting rib is straightened 2-4mm and then increased by 25 degrees. It is connected to the slag bag to ensure that the ejection force of the slag bag is fully transferred to the product to assist in its smooth demolding, and the fillet should be appropriately increased to avoid stress concentration;

[0045] Calculate the product's holding force. The slag ladle ejection force must be greater than the product's holding force.

[0046] Three ejection structures need to be designed at the large end of the product, arranged in a triangle, and two forced holding structures need to be designed at the small end, distributed at 45 degrees;

[0047] An ejector pin needs to be added to the slag bag connected to the ejection structure, which is a kinetic energy mechanism of the ejection structure, and an exhaust mechanism is provided at the edge.

[0048] The ejector mounting hole position of the ejector pin is moved into the slag bag cavity and the convex point cavity, and the ejector pin position is formed on the slag bag and the convex point. The slag bag cavity is connected with the connecting rod big head cavity and the connecting rod small head cavity through the groove. After the casting is formed, a connecting rib for connecting the slag bag mold and the casting will be formed in the groove as a force transmission part. When the slag bag is ejected, the casting is brought out through the connecting rib to achieve demoulding.

[0049] Since the two protrusions in the connecting rod big end cavity for fitting with the connecting rod cover and the bearing mounting grooves between the two protrusions are both later cutting surfaces, the outer wall of the connecting rod small end is also used as an outer surface for easy processing. The connecting ribs there can be cut off together when cutting the runner. The connecting ribs can be cut off during the later processing process, which can avoid leaving traces such as bumps on the connecting rod body casting and maintain the dynamic balance performance of the connecting rod body.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A die-cast connecting rod cavity structure, characterized in that: It includes a connecting rod body cavity opened on the movable mold, one end of the connecting rod body cavity is used for forming the connecting rod big end, the other end is used for forming the connecting rod small end, and the middle part is used for forming the connecting rod rib plate; the connecting rod big end cavity includes two protrusions for fitting with the connecting rod cover and a bearing shell mounting groove between the two protrusions; the fitting surfaces of the two protrusions and the connecting rod cover, the inner side surface of the bearing shell mounting groove and the outer side wall of the connecting rod small end are all connected with grooves, and a slag collecting bag cavity is connected through the groove; a plurality of ejection structures are arranged on the connecting rod body, the ejection structure includes a slag collecting bag and a connecting rib, and the slag collecting bag serves as the ejection position of the ejector; one end of the connecting rib is connected to the slag collecting bag, and the other end is connected to the big end processing surface or the small end outer wall of the connecting rod body; the cross section of the connecting rib is a T-shaped structure; the bottom of the slag collecting bag cavity is provided with a mounting hole for ejection of the ejector.

2. The die-cast connecting rod cavity structure according to claim 1, characterized in that: A convex cavity is arranged between the inner side surface of the bearing bush mounting groove, the outer side surface of the connecting rod small head and the slag collecting bag, and a mounting hole for ejecting an ejector pin is opened at the bottom of the convex cavity.

3. The die-cast connecting rod cavity structure according to claim 2, characterized in that: The slag collecting bag cavity is connected with an exhaust passage.

4. A die-casting mold, characterized in that: The invention comprises the die-cast connecting rod cavity structure as described in any one of claims 1 to 3.

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