A forging process for a cutter head of a heading machine

Abstract

The present application belongs to the technical field of forging process, and particularly relates to a kind of cutter head forging process for heading machine, and the process route is: blanking, heating, blank making, forming, punching, trimming, heat treatment, shot peening, rough turning, and after forging, the furnace is directly entered for heat preservation cooling to 500 degrees, then heating to 870 degrees, heat preservation for 3 hours, and annealing treatment is directly completed together, so that good processing conditions and internal organization are obtained, the shortcomings of the prior art are overcome, the technical problem that H13 material is difficult to process in the existing forging process is solved, and the product produced by the process has high streamline, uniformity and compactness, and is continuously closed along the outer contour of the annular part section without disorder.

Description

Technical Field

[0001] This invention belongs to the field of forging technology, specifically relating to a forging process for a cutterhead for a tunneling machine. Background Technology

[0002] Forging is a processing method that uses forging machinery to apply pressure to metal billets, causing them to undergo plastic deformation to obtain forgings with specific mechanical properties, shapes, and dimensions. It is one of the two major components of forging and pressing (forging and stamping). Forging can eliminate defects such as casting porosity generated during the smelting process, optimize the microstructure, and, because it preserves the complete metal flow lines, the mechanical properties of forgings are generally superior to those of castings made of the same material. Important parts in related machinery that bear high loads and operate under harsh conditions are often forged, except for simpler shapes that can be made from rolled plates, profiles, or welded parts. Reasonable forging temperature and a suitable length-to-diameter ratio of the material are used to ensure the forging flow lines and performance of the product.

[0003] The cutterhead for the tunneling machine is made of H13. This material has a relatively narrow forging temperature range and is a die steel with poor forging fluidity. Therefore, traditional forging processes cannot meet its production requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a forging process for cutterheads of tunneling machines, which overcomes the shortcomings of the prior art and solves the technical problem that it is difficult to process H13 material using existing forging processes.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A forging process for a cutterhead used in a tunneling machine, characterized by the following steps:

[0007] Step 1: Material preparation, using H13 steel;

[0008] Step 2: Heating. The metal block is placed in a heating box, where it is heated.

[0009] Step 3: Billet making. The heated metal block is placed on a forging machine and pre-forged into a billet.

[0010] Step 4: Shaping. The billet is heated again as in Step 2. After heating, the billet is placed on a forging machine equipped with a special forging die and forged using a programmable electro-hydraulic hammer. By adjusting the striking force, the material is shaped to a certain extent to obtain a semi-finished billet with good streamline.

[0011] Step 5: Punching, punching holes in the semi-finished blank;

[0012] Step Six: Trim the edges of the semi-finished blank;

[0013] Step 7: Heat treatment. The semi-finished billet after trimming is heated again according to Step 2. After heating, it is directly put into the furnace for holding and cooling to 500 degrees. Then it is heated to 870 degrees and held. Finally, the annealing process is completed together.

[0014] Step 8: Shot peening, the heat-treated semi-finished billet is shot peened;

[0015] Step Nine: Rough Carrying.

[0016] Furthermore, the heating temperature in step two is controlled at 1100–1150°C.

[0017] Furthermore, the heat preservation time in step seven is 3 hours.

[0018] Furthermore, the dedicated forging die includes an upper die and a lower die that cooperate with each other, and a shaping groove is provided between the upper die and the lower die.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The products produced by this process have a high, uniform, and dense streamline, which is continuous and closed along the outer contour of the annular part cross-section without disorder.

[0021] 2. After forging, the material is directly placed into the furnace and kept at a temperature of 500 degrees Celsius. Then, it is heated to 870 degrees Celsius and held for 3 hours. The annealing process is completed together with the forging process to obtain good processing conditions and internal structure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a forging process for a cutterhead used in a tunneling machine.

[0023] Figure 2 A schematic diagram of the cutterhead used in a tunneling machine. Detailed Implementation

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

[0025] As shown in the figure, the forging process for a cutterhead for a tunneling machine according to the present invention is characterized by the following steps:

[0026] Step 1: Material preparation, using H13 steel;

[0027] Step 2: Heating. The metal block is placed in a heating box, where it is heated to a temperature of 1100-1150℃.

[0028] Step 3: Billet making. The heated metal block is placed on a forging machine and pre-forged into a billet.

[0029] Step 4: Forming. The billet is heated again as in Step 2. After heating, the billet is placed on a forging machine equipped with a special forging die. The special forging die includes an upper die and a lower die that cooperate with each other. A shaping groove is set between the upper die and the lower die. The billet is forged using a programmable electro-hydraulic hammer. By adjusting the striking force, the material is shaped to a certain extent to obtain a semi-finished billet with good flow lines.

[0030] Step 5: Punching, punching holes in the semi-finished blank;

[0031] Step Six: Trim the edges of the semi-finished blank;

[0032] Step 7: Heat treatment. The semi-finished billet after trimming is heated again according to Step 2. After heating, it is directly put into the furnace for holding and cooling to 500 degrees. Then it is heated to 870 degrees and held for 3 hours. Finally, the annealing process is completed together.

[0033] Step 8: Shot peening, the heat-treated semi-finished billet is shot peened;

[0034] Step Nine: Rough Carrying.

[0035] The process uses UG and DEFORM simulations to verify the feasibility of the process, performs numerical simulation analysis on different process schemes, selects the best scheme to meet the customer's metal flow line requirements, and conducts product trials based on the designed mold to verify the reliability of the mold and process.

[0036] Because the forging material is H13 die steel, after consulting the literature, it was found that the forging temperature range of this material is narrow and furnace cooling is required after forging. After locking all the processes in the early stage, the forging was trial-produced. After forging, annealing treatment was performed to obtain good processing conditions and internal structure.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A forging process for a cutterhead for a tunneling machine, characterized in that: Specifically, the steps include the following: Step 1: Material preparation, using H13 steel; Step 2: Heating. The metal block is placed in a heating box, where it is heated. Step 3: Billet making. The heated metal block is placed on a forging machine and pre-forged into a billet. Step 4: Shaping. The billet is heated again as in Step 2. After heating, the billet is placed on a forging machine equipped with a special forging die and forged using a programmable electro-hydraulic hammer. By adjusting the striking force, the material is shaped to a certain extent to obtain a semi-finished billet with good streamline. Step 5: Punching, punching holes in the semi-finished blank; Step Six: Trim the edges of the semi-finished blank; Step 7: Heat treatment. The semi-finished billet after trimming is heated again according to Step 2. After heating, it is directly put into the furnace for holding and cooling to 500 degrees. Then it is heated to 870 degrees and held. Finally, the annealing process is completed together. Step 8: Shot peening, the heat-treated semi-finished billet is shot peened; Step Nine: Rough Carrying.

2. The forging process for a cutterhead for a tunneling machine according to claim 1, characterized in that: The heating temperature in step two is controlled at 1100-1150℃.

3. The forging process for a cutterhead for a tunneling machine according to claim 1, characterized in that: The heat preservation time in step seven is 3 hours.

4. The forging process for a cutterhead for a tunneling machine according to claim 1, characterized in that: The dedicated forging die includes an upper die and a lower die that cooperate with each other, and a shaping groove is provided between the upper die and the lower die.

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