Planet carrier die forging die

Abstract

The utility model relates to a planet carrier die forging die which comprises an upper die and a lower die, the bottom face of the upper die is downwards provided with a cone-frustum-shaped main shaft forming cavity, and the surface of the upper die is provided with a discharging groove around the main shaft forming cavity. A base block forming cavity is downwards formed in the top face of the lower die, three split shaft forming cavities are uniformly formed in the bottom face of the base block forming cavity in the circumferential direction, each split shaft forming cavity is in an inverted cone frustum shape, the side wall of each base block forming cavity is inclined, and the large end of each base block forming cavity is located on the top face of the lower die; when the upper die and the lower die are closed, a parting surface is formed on the contact side of the upper die and the lower die, the edge of the discharging groove at least extends to be communicated with the base block forming cavity, and a blank forms a main shaft part, a base block part and a split shaft part in the main shaft forming cavity, the base block forming cavity and the split shaft forming cavity respectively. The blank flows from the position far away from the parting surface to the parting surface, redundant blank flows into the discharging groove, in the subsequent shearing and trimming process, the redundant blank is concentrated near the parting surface, cleaning is convenient, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of planet carrier forging, in particular to a die for precision forging of a planet carrier. Background Art

[0002] A planet carrier is a structure that supports planet gears in a planetary gear transmission mechanism. It is generally formed by forging. For its basic structure, please refer to Figures 5-6 , which includes a main shaft, a base block, and multiple sub-shafts.

[0003] The traditional production process of planet carriers generally uses open-die forging. The metal blank is placed on a fixed anvil, and a moving hammer head is used to apply impact force or continuous pressure to it. This external force causes the metal to flow and deform freely without a die with a strictly defined shape, so as to form the required shape and size. There are problems such as high blanking weight, large production consumption, and low production efficiency in this production process.

[0004] Based on this, there is an urgent need for a planet carrier die that can replace open-die forging with precision forging to improve production efficiency. Due to the multi-axis structure of the planet carrier with a main shaft and multiple sub-shafts, the existing die design structure cannot ensure that the structure of the planet carrier can be quickly formed. After forming, there are often many burrs and leftovers, and it is difficult to perform shearing and trimming and subsequent machining. Summary of the Utility Model

[0005] I. Technical Problems to be Solved

[0006] The purpose of the utility model is to provide a die for precision forging of a planet carrier, which can be quickly formed, the finished planet carrier after precision forging is easy to shear and trim, and the production effect is high.

[0007] II. Technical Solutions

[0008] The utility model is realized through the following technical solutions:

[0009] The utility model provides a die for precision forging of a planet carrier, including:

[0010] An upper die, a conical frustum-shaped main shaft forming cavity is opened downward on the bottom surface of the upper die, and a material discharge groove is opened on the surface of the upper die around the main shaft forming cavity;

[0011] A lower die, a base block forming cavity is opened downward on the top surface of the lower die, and three sub-shaft forming cavities are uniformly opened circumferentially on the bottom surface of the base block forming cavity. The sub-shaft forming cavity is in an inverted conical frustum shape, the side wall of the base block forming cavity is inclined, and the large end of the base block forming cavity is located on the top surface of the lower die;

[0012] Wherein, when the upper die and the lower die are closed, a parting surface is formed on the contact side of the upper die and the lower die, and the edge of the material discharge groove at least extends to communicate with the base block forming cavity.

[0013] Furthermore, the material discharge groove gradually deepens from the side close to the main shaft forming cavity towards the distal end.

[0014] Furthermore, the material discharge groove includes a trapezoidal groove section, and the small end of the trapezoidal groove section communicates with the edge of the base block forming cavity when the upper die and the lower die are in contact.

[0015] Furthermore, three material discharge grooves are arranged equidistantly around the main shaft forming cavity, and the trapezoidal groove sections of the three material discharge grooves respectively communicate with the edges of the base block forming cavity close to each main shaft forming cavity.

[0016] Furthermore, a clearance groove is formed by inward depression at the edge of the main shaft forming cavity, and a material blocking flange is formed by protrusion at the lower edge of the clearance groove close to the bottom surface of the upper die.

[0017] Furthermore, the inclination range of the side wall of the main shaft forming cavity is 2° - 5°, and the inclination range of the side wall of the sub - shaft forming cavity is 5° - 8°.

[0018] Furthermore, it further includes a die sleeve. A sleeve hole is provided on the surface of the die sleeve. Both the upper die and the lower die are inserted and connected to the die sleeve. A guide shaft is fixedly connected to the upper surface of the lower die, and a guide hole for sliding connection with the guide shaft is provided on the bottom surface of the upper die.

[0019] III. Beneficial Effects

[0020] The utility model has the following beneficial effects compared with the prior art:

[0021] 1. In the utility model, the blank forms the main shaft, base block and sub - shaft parts of the planet carrier finished product in the main shaft forming cavity, base block forming cavity and sub - shaft forming cavity respectively, with one - time rapid forming. Compared with the traditional free forging process, it has a lighter blank weight, higher production efficiency and less material consumption.

[0022] 2. The main shaft forming cavity is in the shape of a truncated cone, the sub - shaft forming cavity is in the shape of an inverted truncated cone, the side wall of the base block forming cavity is inclined, and the large end of the base block forming cavity is located on the top surface of the lower die; when the dies are closed, a parting surface is formed on the contact side of the upper die and the lower die. Under this structure, the blank is extruded and flows from the place far from the parting surface towards the parting surface direction, and the excess blank finally flows into the material discharge groove. When trimming is carried out subsequently, the excess blank is concentrated near the parting surface, which is convenient for cleaning and improves the production efficiency. Moreover, the smaller ends of the main shaft and the sub - shaft are formed first, and the structure after the formation of the smaller ends is more dense and stable. Brief Description of the Drawings

[0023] Figure 1 is the exploded structural schematic diagram of the utility model;

[0024] Figure 2 is the middle cross - sectional view of the cooperation of the utility model;

[0025] Figure 3 is Figure 2 A partial enlarged view of part A in

[0026] Figure 4 is a schematic structural diagram of the upper die

[0027] Figure 5 is a top view of the planet carrier

[0028] Figure 6 is Figure 5 a sectional view taken along the B-B section in

[0029] 1. Upper die; 101. Spindle forming cavity; 102. Discharge groove; 1021. Trapezoidal groove section; 103. Clearance groove; 104. Stopping flange; 105. Guide hole; 2. Lower die; 201. Base block forming cavity; 202. Split shaft forming cavity; 203. Guide shaft; 3. Die sleeve; 301. Sleeve hole; 4. Planet carrier. Specific embodiments

[0030] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0031] A forging die for a planet carrier, please refer to Figure 1 , comprising an upper die 1, a lower die 2 and a die sleeve 3. Among them, a sleeve hole 301 is provided on the surface of the die sleeve 3, and both the upper die 1 and the lower die 2 are inserted and connected to the die sleeve 3. A guide shaft 203 is fixedly connected to the upper surface of the lower die 2, and a guide hole 105 is provided on the bottom surface of the upper die 1. The guide shaft 203 is slidably connected to the guide hole 105. The upper die 1 and the lower die 2 are combined to form a split forging die for forming the planet carrier 4. The die sleeve 3 can cooperate with upper dies 1 and lower dies 2 of different shapes to form planet carriers 4 of different sizes. The lower die 2 is inserted into the die sleeve 3 for limit fixation, and the upper die 1 is pressed and inserted into the die sleeve 3 by a driving mechanism. The die sleeve 3 limits the position of the upper die 1, so that the guide shaft 203 can be accurately inserted into the guide hole 105, and further, the positions of the upper die 1 and the lower die 2 can be accurately positioned to form a finished planet carrier 4 with consistent forming specifications.

[0032] Among them, a main shaft forming cavity 101 is formed on the upward-facing bottom surface of the upper die 1, and a material discharging groove 102 is formed on the surface of the upper die 1 surrounding the main shaft forming cavity 101; a base block forming cavity 201 is formed on the downward-facing top surface of the lower die 2, and three sub-shaft forming cavities 202 are evenly arranged circumferentially on the bottom surface of the base block forming cavity 201. The blank is placed into the lower die 2, and the upper die 1 is driven to press downward. The blank is extruded and formed within the upper die 1 and the lower die 2. Moreover, the main shaft, base block, and sub-shaft parts of the finished planetary carrier 4 are respectively formed in the main shaft forming cavity 101, the base block forming cavity 201, and the sub-shaft forming cavity 202, achieving one-time rapid forming. Compared with the traditional free forging process, it has a lighter blank weight, higher production efficiency, and less material consumption.

[0033] In the present utility model, the main shaft forming cavity 101 is in the shape of a truncated cone, the sub-shaft forming cavity 202 is in the shape of an inverted truncated cone, the side wall of the base block forming cavity 201 is inclined, and the large end of the base block forming cavity 201 is located on the top surface of the lower die 2; when the dies are closed, a parting surface is formed on the contact side between the upper die 1 and the lower die 2, and the edge of the material discharging groove 102 at least extends to communicate with the base block forming cavity 201.

[0034] The larger end of the base block is located on this parting surface, and the larger ends of the main shaft, base block, and sub-shaft of the formed planetary carrier 4 are all closer to the parting surface compared to their respective smaller ends. Under this structure, the blank is extruded and flows from a position far from the parting surface towards the parting surface direction, and the excess blank finally flows into the material discharging groove 102. When trimming and shearing are carried out subsequently, the excess blank is concentrated near the parting surface, facilitating cleaning and improving production efficiency. Moreover, the smaller ends of the main shaft and sub-shaft are formed first, and the structure after the small ends are formed is more dense and stable.

[0035] Among them, the material discharging groove 102 gradually deepens from the side close to the main shaft forming cavity 101 towards the distal end, so that after the surplus material of the blank is extruded, the part near the planetary carrier 4 is thinner and is easy to shear and trim; the material discharging groove 102 includes a trapezoidal groove section 1021, and the small end of the trapezoidal groove section 1021 communicates with the edge of the base block forming cavity 201 when the upper die 1 and the lower die 2 are in contact; the surplus material near the base block forming cavity 201 is thinner, avoiding the accumulation of excess surplus material near the planetary carrier 4 and making it easier to control the quality of the finished product.

[0036] In addition, the material discharging grooves 102 are evenly arranged in three around the main shaft forming cavity 101, and the trapezoidal groove sections 1021 of the three material discharging grooves 102 respectively communicate with the edges of the base block forming cavity 201 close to the edges of each main shaft forming cavity 101. More surplus material is generated near each sub-shaft, and arranging the material discharging grooves 102 at this position is conducive to the uniform and rapid discharge of the surplus material.

[0037] A clearance groove 103 is formed by inward depression at the edge of the main shaft forming cavity 101. By setting the intermittent groove, a chamfer structure is naturally formed at the connection between the main shaft of the formed planet carrier 4 and the base block, and a discharging space is provided for the surplus material. A material retaining flange 104 is formed by protrusion at the lower edge of the clearance groove 103 near the bottom surface of the upper die 1. The material retaining flange 104 restricts the surplus of the blank on the surfaces of the main shaft and the base block, which is beneficial to the smooth forming of the surface of the base block.

[0038] In this embodiment, the inclination range of the side wall of the main shaft forming cavity 101 is 2° - 5°, and the inclination range of the side wall of the sub-shaft forming cavity 202 is 5° - 8°.

[0039] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A planet carrier forging die, characterized in that: include: An upper die, wherein a truncated cone-shaped main shaft forming cavity is downwardly opened on the bottom surface of the upper die, and a discharge groove is opened on the surface of the upper die around the main shaft forming cavity; A lower mold, wherein the top surface of the lower mold is provided with a base block molding cavity and three branch axis molding cavities uniformly provided in the circumferential direction of the bottom surface of the base block molding cavity, wherein the branch axis molding cavity is in the shape of an inverted truncated cone, the side wall of the base block molding cavity is inclined, and the large end of the base block molding cavity is located on the top surface of the lower mold; Wherein, when the upper mold and the lower mold are closed, a parting surface is formed on the contact side of the upper mold and the lower mold, and the edge of the discharge groove at least extends to communicate with the base block molding cavity.

2. A planet carrier forging die according to claim 1, characterized in that: The discharge groove gradually deepens from the side close to the main shaft forming cavity to the far end.

3. A planet carrier forging die according to claim 2, characterized in that: The discharge groove comprises a trapezoidal groove section, and the small end of the trapezoidal groove section is communicated with the edge of the base block forming cavity when the upper mold and the lower mold are in contact.

4. A planet carrier forging die according to claim 3, characterized in that: The three discharge grooves are equidistantly arranged around the main shaft forming cavity, and the trapezoidal groove sections of the three discharge grooves are respectively connected with the edges of the base block forming cavity close to each main shaft forming cavity.

5. A planet carrier forging die according to claim 4, characterized in that: The edge of the main shaft forming cavity is inwardly recessed to form a gap groove, and the lower edge of the gap groove is convex near the bottom surface of the upper mold to form a material blocking flange.

6. The planet carrier forging die according to claim 1, characterized in that: The inclination of the side wall of the main shaft forming cavity ranges from 2° to 5°, and the inclination of the side wall of the sub-shaft forming cavity ranges from 5° to 8°.

7. A planet carrier forging die according to any one of claims 1 to 6, characterized in that: It also includes a mold sleeve, the surface of which is provided with a sleeve hole, the upper mold and the lower mold are both plug-in connected to the mold sleeve, the upper surface of the lower mold is fixedly connected with a guide shaft, and the bottom surface of the upper mold is provided with a guide hole slidably connected to the guide shaft.

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