A crankshaft pre-forging die

Abstract

This utility model discloses a crankshaft pre-forging mold, belonging to the field of crankshaft production technology. It includes a lower mold and an upper mold with a pre-forging unit cavity. The pre-forging unit cavity includes two end-shaft forming grooves, and an ejector assembly is provided at the bottom of the two end-shaft forming grooves. The ejector assembly includes a matching ejector groove and an ejector block, as well as a drive assembly. The pre-forging unit cavity is also provided with an exhaust assembly, which includes an exhaust hole and a heat dissipation vent opened on the pre-forging unit cavity. The heat dissipation vent is located on the front surface wall of the lower mold. This utility model, by setting matching ejector grooves and ejector blocks, and an arc-shaped structure where the ejector block adapts to the end-shaft of the crankshaft blank, allows the hydraulic rod to push the ejector rod on the connecting rod upwards after the crankshaft blank is forged. This pushes the ejector rod to push the ejector block, simultaneously ejecting the end-shaft, facilitating the removal of the crankshaft blank from the mold cavity and making demolding more convenient.

Description

Technical Field

[0001] This utility model belongs to the field of crankshaft production technology, specifically relating to a crankshaft pre-forging mold. Background Technology

[0002] The crankshaft is the main rotating component of an engine. After being fitted with connecting rods, it transforms the up-and-down (reciprocating) motion of the connecting rods into cyclic (rotational) motion. As an important component of the engine, it is made of carbon structural steel or ductile iron. It has two important parts: the main journal and the connecting rod journal (and others). The main journal is mounted on the cylinder block, the connecting rod journal connects to the big end bore of the connecting rod, and the small end bore of the connecting rod connects to the piston of the cylinder. Crankshafts are usually manufactured by forging. The blank part is placed in a mold for forging, which plastically deforms the blank part, changing its size, shape, and improving its performance.

[0003] In patent CN202222524734.2, entitled "A Multi-Crankshaft Pre-Forging Die," an ejector rod is used to pass through the ejector hole and act on the flash of the pre-forged billet to lift the pre-forged billet and facilitate its removal from the lower pre-forging die. However, the ejector hole is located at a certain distance from the die cavity, which cannot guarantee that the ejector rod can act on the flash of the billet, making demolding inconvenient. In addition, after the upper and lower dies are closed, the upper and lower mold cavities are in a sealed state, and the hot air in the cavity cannot be discharged from the die, resulting in reverse pressure caused by air entrapment. Utility Model Content

[0004] The purpose of this invention is to provide a crankshaft pre-forging die to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a crankshaft pre-forging mold, comprising a lower mold and an upper mold having a pre-forging unit cavity, wherein the pre-forging unit cavity includes two end shaft forming grooves, and an ejection assembly is provided at the bottom of the two end shaft forming grooves. The ejection assembly includes an ejection groove and an ejection block that fit together and are connected, as well as a drive assembly. The pre-forging unit cavity is also provided with an exhaust assembly, wherein the exhaust assembly includes an exhaust hole and a heat dissipation port opened on the pre-forging unit cavity. The heat dissipation port is provided on the front surface wall of the lower mold, and a dustproof net is installed on the heat dissipation port.

[0006] Preferably, the pre-forging unit cavity further includes a crankshaft forming groove, a counterweight forming groove, and a connecting rod forming groove. The crankshaft forming groove, the counterweight forming groove, and the connecting rod forming groove are disposed between the two end shaft forming grooves, and the two end shaft forming grooves, the crankshaft forming groove, the counterweight forming groove, and the connecting rod forming groove are interconnected.

[0007] Preferably, the bottom of the ejector block is provided with an ejector hole.

[0008] Preferably, the drive assembly includes a hydraulic rod, a connecting rod fixed to the telescopic end of the hydraulic rod, and two telescopic rods, both of which are fixed to the top of the connecting rod.

[0009] Preferably, the two ends of the connecting rod are vertically extended upwards and are equipped with push rods, which pass through the ejection groove and extend to the top of the ejection groove to correspond to the ejection hole.

[0010] Preferably, the exhaust assembly further includes fan blades and a motor for driving the fan blades to rotate, wherein the motor and fan blades are mounted at the heat dissipation port.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] (1) By setting a matching ejector groove and ejector block, and an arc-shaped structure that matches the end shaft of the crankshaft blank, after the crankshaft blank is forged, the ejector rod on the connecting rod is pushed upward by the hydraulic rod, so that the ejector rod pushes the ejector block and pushes out the end shaft at the same time, making it easier to remove the crankshaft blank from the mold cavity and making demolding more convenient.

[0013] (2) By setting up an exhaust device, the gas in the sealed mold cavity is discharged through the exhaust hole after the upper and lower molds are closed. The hot air in the mold cavity is discharged to the outside of the mold by the cooperation of the motor and the fan blade, ensuring that there is no air stagnation in the cavity. Attached Figure Description

[0014] Figure 1 This is a top view of the lower mold of this utility model;

[0015] Figure 2 for Figure 1 Enlarged view of point A in the image;

[0016] Figure 3 This is a diagram showing the internal structure of the lower mold of this utility model;

[0017] Figure 4 This is a front view of the lower mold of this utility model;

[0018] Figure 5 This is a top sectional view of the lower mold of this utility model;

[0019] Figure 6 The three-dimensional top plate of this utility model Figure 1 ;

[0020] Figure 7 The three-dimensional top plate of this utility model Figure 2 ;

[0021] Figure 8 for Figure 3 Enlarged view of point B in the image;

[0022] Figure 9 This is a schematic diagram of the upper mold of this utility model.

[0023] In the diagram: 1-Lower mold; 11-End shaft forming groove; 12-Crankshaft forming groove; 13-Counterweight forming groove; 14-Connecting rod forming groove; 15-Exhaust hole; 151-Heat dissipation vent; 152-Motor; 153-Fan blade; 16-Ejection groove; 17-Ejection block; 171-Hydraulic rod; 172-Connecting rod; 173-Telescopic rod; 174-Ejection hole; 175-Ejector rod; 2-Upper mold. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-9 As shown, this utility model provides the following technical solution: a crankshaft pre-forging mold, including a lower mold 1 and an upper mold 2 with a pre-forging unit cavity. The pre-forging unit cavity includes two end shaft forming grooves 11. The bottom of the two end shaft forming grooves 11 is provided with an ejection assembly. The ejection assembly includes an ejection groove 16 and an ejection block 17 that fit together and are connected together, as well as a drive assembly, so that the ejection groove 16 and the ejection block 17 are connected more tightly and do not affect the forging. The bottom of the ejection block 17 is provided with an ejection hole 174. The pre-forging unit cavity is also provided with an exhaust assembly. The exhaust assembly includes an exhaust hole 15 and a heat dissipation port 151 opened on the pre-forging unit cavity. The heat dissipation port 151 is provided on the front surface wall of the lower mold 1, and a dustproof net is installed on the heat dissipation port 151 to prevent dust from entering the mold base.

[0026] The pre-forging unit cavity also includes a crankshaft forming groove 12, a counterweight forming groove 13, and a connecting rod forming groove 14. The crankshaft forming groove 12, the counterweight forming groove 13, and the connecting rod forming groove 14 are arranged between two end shaft forming grooves 11, and the two end shaft forming grooves 11, the crankshaft forming groove 12, the counterweight forming groove 13, and the connecting rod forming groove 14 are interconnected to ensure the normal forging of the crankshaft blank.

[0027] In response to the above, when using the crankshaft pre-forging mold, the crankshaft blank is placed into the pre-forging unit cavity of the lower mold 1, corresponding to the end shaft forming groove 11, crankshaft forming groove 12, counterweight forming groove 13 and connecting rod forming groove 14. After placement, the upper mold 2 and the lower mold 1 are closed to forge the crankshaft blank. During the forging process, the crankshaft blank is heated. The hot air generated in the sealed mold cavity is discharged from the mold cavity through the exhaust hole 15 and discharged from the mold cavity through the heat dissipation port 151, ensuring that there is no air trapped in the mold cavity. After the crankshaft blank is forged, the upper mold 2 and the lower mold 1 are separated, that is, the crankshaft blank is ejected by the ejector block 17 to complete the demolding.

[0028] Specifically, such as Figure 3 and Figure 8 As shown, in one embodiment, regarding the above-described driving component:

[0029] The drive assembly includes a hydraulic rod 171, a connecting rod 172 fixed to the telescopic end of the hydraulic rod 171, and two telescopic rods 173. The two telescopic rods 173 are fixed to the top of the connecting rod 172. The two telescopic rods 173 serve as auxiliary connecting rods 172 and support the hydraulic rod 171 to be electrically connected to the external forging equipment control device.

[0030] The two ends of the connecting rod 172 are vertically extended upwards and are equipped with push rods 175. The push rods 175 pass through the ejection groove 16 and extend to the top of the ejection groove 16 to correspond to the ejection hole 174.

[0031] In response to the above, when the drive assembly is working, after the crankshaft blank is forged, the hydraulic rod 171 is activated. The hydraulic rod 171 pushes the connecting rod 172 upward, and the push rod 175 at the top of the connecting rod 172 is pushed upward, so that the push rod 175 is pushed into the ejector hole 174. The push rod 175 pushes the ejector block 17 out, and thus the ejector block 17 supports the shaft end of the crankshaft blank and pushes it out, completing the demolding and making demolding more convenient.

[0032] In addition, such as Figure 4 and Figure 5 As shown, in this utility model, the exhaust assembly also includes a fan blade 153 and a motor 152 that drives the fan blade 153 to rotate. The motor 152 and the fan blade 153 are installed at the heat dissipation port 151. The motor 152 is electrically connected to the control device of the external forging equipment. When the motor 152 is started, the motor 152 drives the fan blade 153 to rotate, which can quickly exhaust the hot air discharged from the exhaust port 15 through the heat dissipation port 151.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A crankshaft pre-forging die, characterized in that: The mold includes a lower mold (1) and an upper mold (2) with a pre-forging unit cavity. The pre-forging unit cavity includes two end shaft forming grooves (11). The bottom of the two end shaft forming grooves (11) is provided with an ejection assembly. The ejection assembly includes an ejection groove (16) and an ejection block (17) that fit together and a drive assembly. The pre-forging unit cavity is also provided with an exhaust assembly. The exhaust assembly includes an exhaust hole (15) and a heat dissipation port (151) opened on the pre-forging unit cavity. The heat dissipation port (151) is provided on the front surface wall of the lower mold (1), and a dustproof net is installed on the heat dissipation port (151).

2. The crankshaft pre-forging die according to claim 1, characterized in that: The pre-forging unit cavity also includes a crankshaft forming groove (12), a counterweight forming groove (13), and a connecting rod forming groove (14). The crankshaft forming groove (12), the counterweight forming groove (13), and the connecting rod forming groove (14) are arranged between two end shaft forming grooves (11), and the two end shaft forming grooves (11), the crankshaft forming groove (12), the counterweight forming groove (13), and the connecting rod forming groove (14) are interconnected.

3. The crankshaft pre-forging die according to claim 1, characterized in that: The bottom of the ejector block (17) is provided with an ejector hole (174).

4. A crankshaft pre-forging die according to claim 3, characterized in that: The drive assembly includes a hydraulic rod (171), a connecting rod (172) fixed to the telescopic end of the hydraulic rod (171), and two telescopic rods (173), both of which are fixed to the top of the connecting rod (172).

5. A crankshaft pre-forging die according to claim 4, characterized in that: The two ends of the connecting rod (172) are vertically extended upwards and are equipped with top rods (175). The top rods (175) pass through the ejection groove (16) and extend to the top of the ejection groove (16) to correspond to the ejection hole (174).

6. A crankshaft pre-forging die according to claim 1, characterized in that: The exhaust assembly also includes a fan blade (153) and a motor (152) for driving the fan blade (153) to rotate. The motor (152) and the fan blade (153) are installed at the heat dissipation port (151).

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