Forging process for oil sprayer body

Abstract

The invention discloses a fuel injector body forging process, and relates to the technical field of forging, and the fuel injector body forging process is characterized by comprising the following steps that a cylindrical bar is subjected to blanking, heating, blank upsetting, pre-forging, finish forging and edge cutting in sequence to obtain a fuel injector body forged piece, and the cylindrical bar is subjected to blank upsetting in the blank upsetting process to form a mushroom head shape or a 7-shaped head shape; the volume of the fuel injector body forge piece is 70%-92% of the volume of the cylindrical bar, before die filling, related parts of a die and a die frame are wiped and cleaned, the cylindrical bar is put into a preheating die to be heated, the preheating temperature of the preheating die is 150-200 DEG C, the tapping temperature of the cylindrical bar from the interior of the preheating die is 1020 + / -20 DEG C, the tapping temperature of the cylindrical bar from the interior of the preheating die is 150-200 DEG C, and the tapping temperature of the cylindrical bar from the interior of the preheating die is 150-200 DEG C; the method has the effects of changing the shape of the pier blank and not shortening the service life of the die while improving the material utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of forging, and more particularly to a forging process for a fuel injector body. Background Art

[0002] The injector body is an important part of the internal combustion engine, and its quality directly affects the performance and life of the engine. The injector body needs to be processed by forging during the processing. Forging is a metal processing method that plastically deforms the metal material by heating and applying pressure to obtain parts with the required shape and performance. Forging can improve the internal structure of the metal and improve its mechanical properties. The traditional manufacturing process of the injector body usually performs a forging process after cutting, but this method has problems such as low material utilization and low production efficiency. With the increasing requirements of the automotive industry for high efficiency and environmental protection, the development of new injector body forging processes has become an inevitable demand. Summary of the invention

[0003] In view of the shortcomings of the prior art, the object of the present invention is to provide a forging process for a fuel injector body.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A fuel injector body forging process is disclosed, wherein a cylindrical bar stock is subjected to the steps of blanking, heating, forging, pre-forging, final forging and trimming to obtain a fuel injector body forging. The forging step forms the cylindrical bar stock into a mushroom head shape or a "7" head shape, and the volume of the fuel injector body forging is 70%-92% of the volume of the cylindrical bar stock.

[0006] Preferably, before installing the mold, the relevant parts of the mold and the mold frame are wiped and cleaned.

[0007] Preferably, the cylindrical bar is placed in a preheating mold for heating treatment, and the preheating temperature of the preheating mold is 150-200°C.

[0008] Preferably, the temperature of the cylindrical bar out of the preheated mold is 1020±20°C.

[0009] Preferably, the forging process is performed by a pre-forging die and a final forging die, and after the pre-forging die and the final forging die are processed, a cooling lubricating liquid is sprayed on the inside of the pre-forging die and the final forging die by a spray gun.

[0010] Preferably, the upsetting blank is processed by an upsetting blank mold, which includes an upsetting blank upper mold and an upsetting blank lower mold. A push rod hole is provided at the bottom of the upsetting blank lower mold, and a push rod is movably provided inside the push rod hole. After the upsetting blank is processed inside the cavity of the upsetting blank lower mold, the upsetting blank upper mold is moved upward, and the upsetting blank is ejected from the cavity of the upsetting blank lower mold under the action of the push rod in the upsetting blank lower mold moving upward.

[0011] Preferably, the forming stress of the upsetting die is 600Mpa-700Mpa.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In the present invention, the heated fuel injector body blank is placed in the upsetting blank lower mold cavity of the upsetting blank die, and the upsetting blank upper die presses the fuel injector body blank during the downward process to complete the upsetting extrusion to form the upsetting blank, and the upsetting blank is first formed into a "7" head shape during the forming process. In this way, the material utilization rate can be greatly improved by forming the head of the upsetting blank into a "7" head shape, and the wear of the upsetting blank die cavity mouth is moderate, so it is suitable for mass production.

[0014] 2. In the present invention, a push rod is movably arranged inside the bottom of the lower die of the upsetting blank, so that the upsetting blank material inside the lower die of the upsetting blank can be ejected. After the material is upset into a "7"-shaped shape in the lower mold cavity of the upsetting blank, the upper die of the upsetting blank moves upward, and the push rod in the lower die of the upsetting blank is pushed upward, so that the upsetting blank material after the upsetting blank is ejected from the lower die of the upsetting blank. Even if the cavity of the lower die of the upsetting blank is slightly deformed, the push rod can still eject the upsetting blank material from the lower die of the upsetting blank, thereby extending the service life of the lower die of the upsetting blank. Therefore, the present invention can change the shape of the upsetting blank without reducing the mold life while achieving improved material utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a process flow of a fuel injector body forging process is provided for the present invention;

[0016] Figure 2 The present invention provides a schematic diagram of the connection between an upsetting upper die, an upsetting lower die and a push rod in a forging process of a fuel injector body;

[0017] Figure 3 A schematic diagram of a fuel injector body forging process in which the fuel injector body is upset into a "7"-shaped shape is provided for the present invention;

[0018] Figure 4 A schematic diagram of a forging process for a fuel injector body that is uprooted into a mushroom head shape is provided in the present invention;

[0019] Figure 5 A schematic diagram of the result of pre-forging in a forging process of a fuel injector body is provided for the present invention;

[0020] Figure 6 The present invention provides a schematic diagram of the result of final forging in a forging process for a fuel injector body.

[0021] In the figure: 1. Upsetting blank upper die; 2. Upsetting blank lower die; 3. Ejector rod. DETAILED DESCRIPTION

[0022] Reference Figures 1 to 6 .

[0023] Embodiment 1 further illustrates a forging process for a fuel injector body proposed by the present invention.

[0024] A fuel injector body forging process is disclosed, wherein a cylindrical bar stock is subjected to the steps of blanking, heating, blanking, pre-forging, final forging and trimming to obtain a fuel injector body forging. The blanking step blanks the cylindrical bar stock into a mushroom head shape, and the volume of the fuel injector body forging is 70%-80% of the volume of the cylindrical bar stock.

[0025] Embodiment 2 further illustrates a forging process for a fuel injector body proposed by the present invention.

[0026] A fuel injector body forging process is disclosed, wherein a cylindrical bar stock is subjected to the steps of blanking, heating, blanking, pre-forging, final forging and trimming to obtain a fuel injector body forging. The blanking step blanks the cylindrical bar stock into a "7" head shape, and the volume of the fuel injector body forging is 90%-92% of the volume of the cylindrical bar stock.

[0027] In the comparative example, the injector body blank is directly forged once after being cut to form a final forging material.

[0028] Table 1 is obtained by comparing the data of Example 1, Example 2 and the comparative example.

[0029]

[0030]

[0031] Table 1

[0032] By comparing and analyzing the data of Example 1, Example 2 and the comparative example in Table 1, it is found that when the conventional upsetting method in the comparative example is used to upset the injector body blank, the material utilization rate is only 67.7%, when the mushroom head upsetting method in Example 1 is used to upset the injector body blank, the material utilization rate is 78.9%, and when the "7" head upsetting method in Example 2 is used to upset the injector body blank, the material utilization rate is 90.2%. It can be seen that the material utilization rate is significantly improved by forming the head of the injector body blank into a "7" head shape through Example 2; and when the head of the injector body blank is formed into a "7" head shape through Example 2, the wear of the upsetting mold cavity mouth is moderate, so it is suitable for mass production.

[0033] Embodiment 3 adds the following technical features based on Embodiment 2:

[0034] A forging process for a fuel injector body includes wiping and cleaning relevant parts of the die and die frame before die installation.

[0035] It should be noted that before processing the upsetting die, pre-forging die and final forging die, the waste materials inside the upsetting die, pre-forging die and final forging die need to be cleaned to prevent the waste materials and other substances inside the upsetting die, pre-forging die and final forging die from affecting the processing.

[0036] Embodiment 4 adds the following technical features based on Embodiment 2:

[0037] A forging process for a fuel injector body, wherein a cylindrical bar is placed in a preheating die for heating treatment, and the preheating temperature of the preheating die is 150-200°C. The purpose of preheating the upsetting die during the upsetting process is mainly to control the forging quality, improve the die life, and ensure the temperature uniformity of the billet during the processing.

[0038] Embodiment 5 adds the following technical features based on Embodiment 2:

[0039] A forging process for a fuel injector body, wherein the temperature of a cylindrical bar material exiting a preheating die is 1020±20°C, so that the quality of the upsetting blank can be ensured.

[0040] Embodiment 6 adds the following technical features based on Embodiment 2:

[0041] A fuel injector body forging process includes forging through a pre-forging die and a final forging die. After the pre-forging die and the final forging die are processed, a cooling lubricant is sprayed into the pre-forging die and the final forging die through a spray gun.

[0042] It should be noted that the purpose of spraying cooling lubricant on the inside of the pre-forging die and the final forging die through a spray gun is mainly to improve the life of the die and the quality of the forgings during the forging process. During the forging process, the contact between the die and the high-temperature billet will cause the surface temperature of the die to rise rapidly. By spraying cooling lubricant, the temperature of the die can be effectively reduced, and the wear and deformation of the die caused by excessive temperature can be reduced. The rapid temperature rise of the die surface will generate thermal stress, which may cause cracks or deformation of the die. Spraying cooling lubricant helps to evenly distribute heat and reduce the generation of thermal stress. The cooling lubricant can form a lubricating film on the die surface, which helps to improve the fluidity of the metal in the die, making it easier for the forging to be removed from the die and reducing the sticking phenomenon. During the forging process, the high temperature environment can easily lead to oxidation of the die and forging surface. Spraying lubricant can isolate the air to a certain extent, reduce the occurrence of oxidation reactions, and also prevent the chemical components in the lubricant from corroding the die, and remove the oxide scale inside the die cavity.

[0043] Embodiment 7 adds the following technical features based on Embodiment 2:

[0044] A forging process for a fuel injector body is disclosed. A forging process is performed on a forging blank through a forging blank die. The forging blank die comprises an upsetting blank upper die 1 and an upsetting blank lower die 2. A push rod hole is arranged at the bottom of the upsetting blank lower die 2. A push rod 3 is movably arranged inside the push rod hole. After the upsetting blank is processed inside the cavity of the upsetting blank lower die 2, the upsetting blank upper die is moved upward. The push rod 3 in the upsetting blank lower die 2 moves upward to eject the upsetting blank from the cavity of the upsetting blank lower die 2. The forming stress of the upsetting blank die is 600Mpa-700Mpa, which is convenient for controlling the quality of the upsetting blank.

[0045] The original upsetting process has no ejection mechanism at the upsetting station of the die frame. After the cavity of the lower mold of the upsetting blank is slightly deformed, the blank is difficult to remove and can only be replaced with a new lower mold of the upsetting blank. In this case, an ejector rod 3 is movably arranged inside the bottom ejector hole of the lower mold of the upsetting blank 2. After the blank is upset into a "7" shape in the cavity of the lower mold of the upsetting blank, the upper mold of the upsetting blank 1 moves upward, and the ejector rod in the lower mold of the upsetting blank 2 is ejected upward by an additionally arranged pushing mechanism (for example, a hydraulic telescopic rod), thereby ejecting the upsetting blank from the lower mold of the upsetting blank 2. Even if the cavity of the lower mold of the upsetting blank 2 is slightly deformed, the ejector rod can eject the upsetting blank from the lower mold of the upsetting blank 2, thereby extending the service life of the lower mold of the upsetting blank 2.

[0046] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A forging process for a fuel injector body, wherein a cylindrical bar is subjected to the steps of blanking, heating, blanking, pre-forging, final forging and trimming to obtain a fuel injector body forging, characterized in that: The forging process forms the cylindrical bar stock into a mushroom head shape or a "7" head shape, and the volume of the injector body forging is 70%-92% of the volume of the cylindrical bar stock.

2. A fuel injector body forging process according to claim 1, characterized in that: Before installing the mold, wipe and clean the relevant parts of the mold and mold frame.

3. The injector body forging process according to claim 1, characterized in that: The cylindrical bar is placed in a preheating mold for heating, and the preheating temperature of the preheating mold is 150-200°C.

4. A forging process for a fuel injector body according to claim 3, characterized in that: The temperature of the cylindrical bar out of the preheated mold is 1020±20℃.

5. The injector body forging process according to claim 1, characterized in that: The forging process is performed through a pre-forging die and a final forging die. After the pre-forging die and the final forging die are processed, a cooling lubricant is sprayed on the inside of the pre-forging die and the final forging die through a spray gun.

6. A forging process for a fuel injector body according to claim 1, characterized in that: The upsetting blank is processed by an upsetting blank die, the upsetting blank die comprising an upsetting blank upper die (1) and an upsetting blank lower die (2), the bottom of the upsetting blank lower die (2) is provided with a push rod hole, a push rod (3) is movably provided inside the push rod hole, after the upsetting blank is processed inside the cavity of the upsetting blank lower die (2), the upsetting blank upper die is moved upward, and the upsetting blank is ejected from the cavity of the upsetting blank lower die (2) under the action of the push rod (3) inside the upsetting blank lower die (2).

7. A forging process for a fuel injector body according to claim 6, characterized in that: The forming stress of the upsetting die is 600Mpa-700Mpa.

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