Crank roll forging blank forming die and forming process

Abstract

The invention relates to the technical field of machining, in particular to a crank roll forging blank forming die and a forming process, and the forming process comprises the steps that a metal material is pretreated, a crank blank is obtained for standby application, and the roll forging forming die is installed; the crank blank is fed into a forming die to be subjected to roll forging and shaping for multiple times, and a shaped blank is obtained; according to the process, in the roll forging process, a forging roll rotates continuously, the production efficiency is high, the needed forming force is smaller than that of die forging, and the waste of materials is reduced to the minimum due to continuous flowing and deformation of the materials in the roll forging process; compared with a traditional metal machining forging method, metal fiber textures are continuously distributed according to the outer contour of the forge piece in the roll forging process, are not cut off, are uniform and good in mechanical property, the forge piece high in precision and small in surface roughness can be produced, the roll forging process is simple, impact and vibration are avoided, and mechanical and automatic production is easy to achieve.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to a crank roll forging blank forming die and a forming process. Background Art

[0002] Cranks are a common mechanical part that is widely used in various mechanical equipment, such as engines, transmissions, etc. Cranks have complex shapes, high dimensional accuracy requirements, and need to withstand large loads and torques. Traditional metal processing methods such as casting, forging, and cutting are difficult to meet the high-precision, high-quality, and efficient production requirements of crank parts.

[0003] Therefore, it is necessary to find a metal plastic forming process that is more suitable for the manufacture of crank parts. Summary of the invention

[0004] The purpose of the present invention is to provide a crank roller forging blank forming die and forming process, aiming to solve the problem that traditional metal processing methods are difficult to meet the high-precision and high-efficiency production requirements of crank parts.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a crank roller forging blank forming process, comprising the following steps:

[0006] Pre-treat the metal material, obtain the crank blank, prepare it for use, and install the roller forging die;

[0007] The crank blank is fed into the forming die for multiple roll forging and shaping to obtain a shaped blank;

[0008] The positioning blank is pre-processed to obtain a semi-finished forging, and the semi-finished forging is tested to obtain a finished crank.

[0009] The specific method of pre-treating the metal material, obtaining the crank blank, preparing it for use, and installing the forging die is as follows:

[0010] Select appropriate metal material based on the crank design requirements and working environment;

[0011] Cutting the metal material to obtain a crank blank for later use;

[0012] The roll forging forming die is mounted on the forging roll of the roll forging machine.

[0013] The specific method of feeding the crank blank into the forming die for multiple roll forging and shaping to obtain the shaped blank is as follows:

[0014] Preheating the crank blank and then feeding it into the forming die;

[0015] Performing multiple roll forging on the preheated crank blank to roll forge a prototype blank;

[0016] The rough blank is cooled and positioned, and the rough blank after shaping is demolded to obtain a shaped rough blank.

[0017] In the roll forging process, the parameters of the roll forging machine and the gap of the forming die should be adjusted in time according to the deformation of the blank and the wear of the die.

[0018] The specific method of pre-processing the positioning blank to obtain the semi-finished forging, and testing the semi-finished forging to obtain the finished crank is as follows:

[0019] The positioning blank is subjected to a process of removing flash and burrs to obtain a semi-finished forging;

[0020] Inspecting and testing the appearance of the semi-finished forgings, removing defective ones, and obtaining finished crank products;

[0021] The finished crank product is subjected to heat treatment and surface treatment.

[0022] The finished crank product is subjected to heat treatment and surface treatment according to user needs. The heat treatment includes quenching and tempering operations, and the surface treatment includes sandblasting and electroplating operations.

[0023] In a second aspect, the present invention further provides a crank roller forging blank forming die, which is applied to the crank roller forging blank forming process as described above.

[0024] The invention discloses a crank roll forging blank forming process, which comprises the following steps: pre-treating metal materials, obtaining crank blanks, setting them aside, and installing a roll forging forming die; feeding the crank blanks into the forming die for multiple roll forging and shaping to obtain shaped blanks; pre-treating the positioned blanks to obtain semi-finished forgings, and testing the semi-finished forgings to obtain finished crank products. In the roll forging process of the process, the forging rollers rotate continuously, the production efficiency is high, and the required forming force is smaller than that of die forging. Therefore, a roll forging machine with a small capacity can generally be selected to meet the production requirements. The continuous flow and deformation of the material during the roll forging process minimizes the waste of the material. The material utilization rate is generally above 80%, which is much higher than that of the traditional metal processing and forging method. The metal fiber structure during roll forging is continuously distributed according to the outer contour of the forging, is not cut off, has a uniform structure, and has good mechanical properties. It can produce forgings with high precision and small surface roughness. The roll forging process is simple, without impact and vibration, and is easy to realize mechanized and automated production, which solves the problem that the traditional metal processing method is difficult to meet the high-precision and efficient production requirements of crank parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 The present invention provides a flow chart of a crank roller forging blank forming process.

[0027] Figure 2 It is a flow chart of the specific method of pre-treating the metal material, obtaining the crank blank, preparing it for use, and installing the forging mold.

[0028] Figure 3 It is a flow chart of a specific method of feeding the crank blank into the forming die for multiple roll forging and shaping to obtain a shaped blank.

[0029] Figure 4 It is a flowchart of a specific method of pre-processing the positioned blank, obtaining a semi-finished forging, and testing the semi-finished forging to obtain a finished crank. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] See also Figures 1 to 4 In a first aspect, the present invention provides a crank roller forging blank forming process, comprising the following steps:

[0032] S1 pre-processes the metal material, obtains the crank blank, prepares it for use, and installs the roller forging forming die;

[0033] Specific method:

[0034] S11 selects appropriate metal materials based on the crank design requirements and working environment;

[0035] In the embodiment of the present invention, a suitable metal material, such as carbon steel, alloy steel, etc., is selected according to the design requirements and working environment of the crank.

[0036] S12: cutting the metal material to obtain a crank blank for standby use;

[0037] In the embodiment of the present invention, the metal material is cut into suitable blanks according to the shape and size of the crank and the hole size of the roll forging die.

[0038] S13 installs the roll forging die onto the forging roll of the roll forging machine.

[0039] S2: feeding the crank blank into the forming die for multiple roll forging and shaping to obtain a shaped blank;

[0040] Specific method:

[0041] S21 preheats the crank blank and then feeds it into the forming die;

[0042] In the embodiment of the present invention, the crank blank is preheated or heated before roll forging to improve its plasticity and reduce deformation resistance. The heating temperature should be determined according to the type of the metal material and the requirements of the roll forging process. The preheated or heated crank blank is fed between the two counter-rotating forming dies of the roll forging machine, and the crank blank is bitten into the forming die under the action of the friction force generated between the die and the crank blank.

[0043] S22 performs multiple roll forging on the preheated crank blank to roll forge a prototype blank;

[0044] In the embodiment of the present invention, the blank is plastically deformed by continuous rolling and pressing of the die. During the roll forging process, the parameters of the roll forging machine and the gap of the die need to be adjusted in time according to the deformation of the blank and the wear of the die to ensure the stability and consistency of the roll forging process, and the blank is roll forged for multiple passes to gradually approach the final shape and size of the crank.

[0045] S23 cools and positions the rough blank, and demolds the rough blank after shaping to obtain a shaped rough blank.

[0046] In the embodiment of the present invention, the blank is cooled to eliminate internal stress and improve hardness. The cooling method should be determined according to the type of metal material and the requirements of the roll forging process. After cooling, the forging is shaped to ensure the stability and accuracy of its shape and size, and finally the demolding equipment is used to assist demolding.

[0047] S3 pre-processes the positioned blank to obtain a semi-finished forging, and inspects the semi-finished forging to obtain a finished crank.

[0048] Specific method:

[0049] S31 removes flash and burrs from the positioning blank to obtain a semi-finished forging;

[0050] In the embodiment of the present invention, the positioning blank is subjected to a process of removing flash and burrs to improve its surface quality.

[0051] S32 inspects and tests the appearance of the semi-finished forgings, removes defective ones, and obtains finished crank products;

[0052] In the embodiment of the present invention, the forgings after roll forging are inspected and tested, including inspections of size, shape, surface quality, mechanical properties and metallographic structure, etc. The semi-finished forgings that do not meet the requirements, i.e. defective products, are removed, and the unqualified semi-finished forgings are trimmed or reworked by roll forging, thereby ensuring the production quality of the crank.

[0053] S33 performs heat treatment and surface treatment on the finished crank product.

[0054] In an embodiment of the present invention, the finished crank product is subjected to heat treatment and surface treatment according to user needs, wherein the heat treatment includes quenching and tempering operations, and the surface treatment includes sandblasting and electroplating operations, so as to improve the mechanical properties and corrosion resistance of the finished crank product and increase the service life of the finished crank product.

[0055] During the roll forging process of this process, the forging rollers rotate continuously, the production efficiency is high, and the required forming force is smaller than that of die forging. Therefore, a small-capacity roll forging machine can generally be selected to meet production needs. The continuous flow and deformation of materials during roll forging minimizes material waste, and the material utilization rate is generally above 80%, which is much higher than traditional metal processing and forging methods. The metal fiber structure during roll forging is continuously distributed according to the outer contour of the forging without being cut off, and the structure is uniform and has good mechanical properties. It can produce forgings with high precision and small surface roughness. The roll forging process is simple, without impact and vibration, and is easy to realize mechanized and automated production, solving the problem that traditional metal processing methods are difficult to meet the high-precision and efficient production needs of crank parts.

[0056] In a second aspect, the present invention further provides a crank roller forging blank forming die, which is applied to the crank roller forging blank forming process as described above.

[0057] What is disclosed above is only a preferred embodiment of a crank roller forging blank forming die and forming process of the present invention. Of course, this cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above-mentioned embodiments and equivalent changes made in accordance with the claims of the present invention still fall within the scope of the invention.

Claims

1. A crank roller forging billet forming process, characterized in that: The following steps are involved: Pre-treat the metal material, obtain the crank blank, prepare it for use, and install the roller forging die; The crank blank is fed into the forming die for multiple roll forging and shaping to obtain a shaped blank; The positioning blank is pre-processed to obtain a semi-finished forging, and the semi-finished forging is tested to obtain a finished crank.

2. The crank roller forging blank forming process according to claim 1, It is characterized by: The specific method of pre-treating the metal material, obtaining the crank blank, preparing it for use, and installing the forging die is as follows: Select appropriate metal material based on the crank design requirements and working environment; Cutting the metal material to obtain a crank blank for later use; The roll forging forming die is mounted on the forging roll of the roll forging machine.

3. The crank roller forging blank forming process according to claim 1, characterized in that; The specific method of feeding the crank blank into the forming die for multiple roll forging and shaping to obtain the shaped blank is: Preheating the crank blank and then feeding it into the forming die; Performing multiple roll forging on the preheated crank blank to roll forge a prototype blank; The rough blank is cooled and positioned, and the rough blank after shaping is demolded to obtain a shaped rough blank.

4. The crank roller forging blank forming process as claimed in claim 3, It is characterized by: During the roll forging process, the parameters of the roll forging machine and the gap of the forming die should be adjusted in time according to the deformation of the blank and the wear of the die.

5. The crank roller forging blank forming process according to claim 1, characterized in that; The specific method of pre-processing the positioning blank to obtain the semi-finished forging, and testing the semi-finished forging to obtain the crank finished product is: The positioning blank is subjected to a process of removing flash and burrs to obtain a semi-finished forging; Inspecting and testing the appearance of the semi-finished forgings, removing defective ones, and obtaining finished crank products; The finished crank product is subjected to heat treatment and surface treatment.

6. The crank roller forging blank forming process as claimed in claim 5, characterized in that; The finished crank product is subjected to heat treatment and surface treatment according to user requirements. The heat treatment includes quenching and tempering operations, and the surface treatment includes sandblasting and electroplating operations.

7. A crank roller forging blank forming die, characterized in that: Applicable to the crank roller forging billet forming process as described in any one of claim 1.

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