Efficient cold forging die and forming process

Abstract

The invention relates to the technical field of hardware mechanical part manufacturing, and discloses an efficient cold forging forming die and a forming technology.The efficient cold forging forming die comprises a die shell, a tungsten steel alloy die cavity is formed in the die shell, the interior of the die shell is connected with a die core pipe through a customized hexagon socket screw, and the die core pipe is attached to the tungsten steel alloy die cavity; an upper core rod is installed in the mold core pipe, a connecting pipe pad is installed at the bottom of the mold core pipe, an upper liner is arranged at the bottom of the upper core rod, an upper spring is arranged outside the upper core rod in a sleeving mode, a lower core rod is arranged in the upper liner, and the bottom of the lower core rod is connected with an ejector rod through a lower spring. By arranging the fixing pad, the position of the mold core pipe in the working process of the mold can be effectively adjusted, accurate control over the press-in depth and the relative position of the mold core pipe in the whole production period is ensured, and in this way, it can be ensured that the high-precision requirement of products of each batch in large-batch production is kept unchanged.

Description

Technical Field

[0001] The invention relates to the technical field of hardware machinery parts manufacturing, in particular to a high-efficiency cold forging die and a forming process. Background Art

[0002] High-efficiency cold forging dies are tools used to form metal parts through the cold forging process. Cold forging is a common metal forming process, often used to produce large quantities of small parts such as bolts, nuts, and gears. It offers high production efficiency and excellent finished product precision. High-efficiency cold forging dies are designed to improve production efficiency, reduce production costs, and ensure high quality during the process.

[0003] Cold forging is the process of forging a metal blank into the desired shape by pressing it through a die at room temperature or slightly heated. Cold forging is suitable for a variety of metal materials, particularly steel, aluminum alloys, and copper alloys. Compared to hot forging, cold forging offers advantages such as higher part precision, superior surface quality, the elimination of heat treatment, and reduced energy consumption.

[0004] The existing manufacturing process of cold forging dies mainly adopts the tungsten steel alloy inserting process. The basic principle of this process is to connect the prefabricated outer conical inner hollow tungsten steel alloy to the hollow inner hexagonal bolt customized at the bottom of the mold shell through a large torque device, and lock it at the front end of the mold shell. The mold shell and the inner core are usually reserved with exhaust holes, and then an electric pulse device is used to pulse discharge the prefabricated copper electrodes to produce the corresponding mold shape and size on the inner wall and bottom of the tungsten steel alloy. However, due to the force of locking the tungsten steel alloy each time and the force between the outer taper of the tungsten steel alloy and the inner taper of the mold shell are not completely consistent, the mold will have a slight displacement during the production process. This slight displacement, along with the frequent replacement of the inner core and the mold, causes differences in the precision of products produced by molds of the same shape and size in different batches, and the mold life is also difficult to predict. Therefore, the present invention provides a high-efficiency cold forging forming mold and forming process to solve the shortcomings existing in the prior art. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides an efficient cold forging mold and forming process, which solves the problem that the existing cold forging mold manufacturing process has a slight displacement of the mold during the production process due to the incomplete consistency of the fit between the mold core and the mold shell, which makes the product precision of molds of the same shape and size inconsistent in different batches of production, and the frequent replacement of the mold core leads to wear and reduced precision.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a high-efficiency cold forging mold, including a mold shell, a tungsten steel alloy mold cavity is provided inside the mold shell, the interior of the mold shell is connected to a mold core tube by a customized hexagonal bolt, the mold core tube is fitted with the tungsten steel alloy mold cavity, an upper core rod is installed inside the mold core tube, and a connecting tube pad is installed at the bottom of the mold core tube.

[0007] Preferably, an upper pad is provided at the bottom of the upper core rod, an upper spring is provided on the outside of the upper core rod, a lower core rod is provided inside the upper pad, the bottom of the lower core rod is connected to the top rod through the lower spring, a lower pad is installed at the bottom of the upper pad, and the bottom of the lower pad is installed on the outside of the top rod.

[0008] Preferably, an exhaust channel is provided at the connection between the core tube and the mold shell of the mold, and the exhaust channel is adapted to the core tube and the inner wall of the mold shell.

[0009] Preferably, a fixing pad is provided between the core mold tube and the mold shell, and the fixing pad is located at the bottom of the core mold tube and is used to adjust and fix the pressing depth of the core mold tube.

[0010] Preferably, the surface of the tungsten steel alloy mold cavity is coated with an anti-wear coating, and the anti-wear coating is a chromium coating.

[0011] Preferably, the upper core rod forms a variable compression force between the upper spring and the core tube, and the compression force adjusts the spring preload between the upper core rod and the core tube according to different requirements of product molding.

[0012] Preferably, the upper pad and the lower pad are matched with each other via a lower spring, and the lower spring provides a rebound force inside the mold.

[0013] Preferably, the outer side of the push rod cooperates with the lower liner, and the push rod is used to drive the lower core rod to separate from the upper core rod.

[0014] The present invention also provides an efficient cold forging forming process, comprising: arranging a tungsten steel alloy die cavity inside a die shell, fixing a die core tube inside the die shell by means of customized hexagon socket bolts, ensuring that the die core tube and the tungsten steel alloy die cavity fit tightly together to provide a stable forming environment, installing an upper core rod inside the die core tube, and installing a connecting pipe pad at the bottom of the die core tube to ensure the matching accuracy of the mold; Place an upper gasket on the bottom of the upper core rod and cover the upper spring on the outside of the upper core rod to provide the necessary compression force. Then install the lower core rod and connect its bottom to the ejector pin through the lower spring. Install the lower gasket on the bottom of the upper gasket and install the bottom of the lower gasket on the outside of the ejector pin. An exhaust channel is set at the connection between the mold core tube and the mold shell to ensure smooth gas discharge and avoid gas stagnation during the mold operation, which affects the molding effect. A fixed pad is installed at the connection between the core tube and the mold shell. This pad is used to adjust the depth of the core tube relative to the mold shell, ensuring a precise fit during the mold operation. By replacing the pad with different thicknesses, the position of the core tube can be precisely adjusted, thus ensuring product consistency and high precision during the molding process. Apply anti-wear coating on the surface of tungsten steel alloy mold cavity, with chromium coating being the best choice, to enhance the wear resistance of the mold and extend the service life of the mold; By adjusting the preload of the upper spring between the upper core rod and the core tube, the compression force inside the mold can be adjusted according to the molding requirements of different products to ensure stability and precision during each molding process; During the molding process, the ejector rod drives the lower core rod to separate from the upper core rod, so that the molded blank can be smoothly removed from the mold.

[0015] The present invention provides a high-efficiency cold forging die and forming process. It has the following beneficial effects: 1. The present invention can effectively adjust the position of the core tube during the working process of the mold by setting a fixed pad, ensuring the precise control of the pressing depth and relative position of the core tube throughout the entire production cycle. In this way, it can ensure that the high-precision requirements of each batch of products in mass production remain unchanged.

[0016] 2. The present invention designs an exhaust channel between the mold core tube and the mold shell to ensure that the gas can be discharged smoothly during the operation of the mold, avoiding gas retention and the problem of uneven force after the mold core is replaced, thereby improving the product molding accuracy and stability and ensuring consistency in the production process.

[0017] 3. The present invention adopts a solution of customized hexagonal bolts and adjustable node positions, which makes the replacement and adjustment of the mold easier. The flexible connection between the core tube and the mold shell allows the core to be reused in multiple production processes, thus reducing the high manufacturing cost caused by replacing the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the main figure of the present invention; Figure 2 This is a schematic diagram of the upper core rod structure of the present invention; Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0019] Among them, 1. mold shell; 2. mold core tube; 3. upper core rod; 4. lower core rod; 5. upper gasket; 6. lower gasket; 7. upper spring; 8. lower spring; 9. ejector rod; 10. tungsten steel alloy mold cavity; 11. customized hexagon socket bolt; 12. fixing pad; 13. connecting pipe pad. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the present specification. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Please see the attached Figure 1 , Attachment Figure 2 and attached Figure 3 , a high-efficiency cold forging mold, including a mold shell 1, a tungsten steel alloy mold cavity 10 is provided inside the mold shell 1, the tungsten steel alloy mold cavity 10 is used to provide a molding space for the mold and ensure the transmission of high-intensity pressure during the cold forging process, the interior of the mold shell 1 is connected to a mold core tube 2 through a customized hexagonal bolt 11, the mold core tube 2 is fitted with the tungsten steel alloy mold cavity 10, an upper core rod 3 is installed inside the mold core tube 2, the upper core rod 3 is used to cooperate with the cold forging process, a connecting pipe pad 13 is installed at the bottom of the mold core tube 2, the connecting pipe pad 13 is used to enhance the stability of the mold and reduce mold wear, the surface of the tungsten steel alloy mold cavity 10 is coated with a layer of anti-wear coating, the anti-wear coating adopts chromium coating, the chromium coating is used to increase the durability of the mold, the upper core rod 3 forms a variable compression force between the mold core tube 2 and the mold core rod 3 through the upper spring 7, and the compression force adjusts the spring preload between the upper core rod 3 and the mold core tube 2 according to different requirements of product molding.

[0022] Please see the attached Figure 1 , Attachment Figure 2 and attached Figure 3 The bottom of the upper core rod 3 is provided with an upper pad 5, which is used to provide support between the upper core rod 3 and the lower core rod 4. The outer sleeve of the upper core rod 3 is provided with an upper spring 7, which is used to provide variable compression force to adjust the spring preload during the mold forming process. The interior of the upper pad 5 is provided with a lower core rod 4, which is used to assist in completing the molding of the product. The bottom of the lower core rod 4 is connected to a push rod 9 through a lower spring 8. The push rod 9 is used to drive the lower core rod 4 to separate from the upper core rod 3. The bottom of the upper pad 5 is installed with a lower pad 6, and the bottom of the lower pad 6 is installed on the outside of the push rod 9. The upper pad 5 and the lower pad 6 are matched through the lower spring 8, and the lower spring 8 provides rebound force inside the mold.

[0023] Please see the attached Figure 1 , Attachment Figure 2 and attached Figure 3 An exhaust channel is provided at the connection between the core tube 2 and the mold shell 1 of the mold. The exhaust channel is adapted to the inner wall of the core tube 2 and the mold shell 1. The exhaust channel is used to ensure that the gas can be discharged smoothly. An adjustable node position 12 is provided at the connection between the core tube 2 and the mold shell 1. The node position 12 is used to realize the position adjustment of the core tube 2 relative to the mold shell 1.

[0024] Please see the attached Figure 1 , Attachment Figure 2 and attached Figure 3 , set a tungsten steel alloy mold cavity 10 inside the mold shell 1, and then use a customized hexagon socket bolt 11 to fix the core tube 2 inside the mold shell 1 to ensure that the core tube 2 fits tightly with the tungsten steel alloy mold cavity 10. Next, install the upper core rod 3 inside the mold core tube 2, and install the connecting pipe pad 13 at the bottom of the mold core tube 2 to ensure the stability and precision of the mold during operation. Set an upper liner 5 at the bottom of the upper core rod 3, and put an upper spring 7 on the outside of the upper core rod 3 to provide the mold with the necessary compression force to adapt to different molding requirements. Then, install the lower core rod 4, and connect its bottom to the push rod 9 through the lower spring 8 to ensure smooth reset of the parts during the molding process. Install the lower liner 6 at the bottom of the upper liner 5, and install the bottom of the lower liner 6 on the outside of the push rod 9 to improve the mold precision and enhance stability. At the connection between the core tube 2 and the mold shell 1, set an exhaust channel to ensure smooth discharge of gas, avoid gas retention during the operation of the mold, affect the molding effect, and ensure the consistency of each molding. A fixing pad 12 is provided between the core tube 2 and the mold shell 1. The fixing pad 12 is located at the bottom of the core tube 2 and is used to adjust and fix the pressing depth of the core tube 2. The position of the core tube 2 relative to the mold shell 1 is adjusted by the fixing pad 12, thereby ensuring the precise fit of the mold during operation and avoiding inconsistent product sizes caused by slight displacement of the mold. An anti-wear coating is applied to the surface of the tungsten steel alloy mold cavity 10, with chromium coating being the best choice, to enhance the wear resistance of the mold, increase the service life of the mold, and reduce maintenance costs after long-term use. By adjusting the preload of the upper spring 7 between the upper core rod 3 and the core tube 2, the compression force inside the mold is adjusted according to the molding requirements of different products, ensuring stability and precision during each molding process, thereby improving product consistency. During the molding process, the push rod 9 drives the lower core rod 4 to separate from the upper core rod 3, so that the molded blank is smoothly removed from the mold, while ensuring the smooth resetting of the mold parts to prepare for the next operation.

[0025] Working Principle: When the machine stroke causes the operating clamp to deliver the blank to the center of the front end of the mold at this station, the machine stroke pushes the blank from the operating clamp into the tungsten steel alloy mold cavity 10 to begin molding. As the machine stroke continues, the blank is squeezed to fill the inner wall and bottom gaps of the tungsten steel alloy mold cavity 10. The blank is squeezed to the required size by the machine stroke, and the mold pressure is gradually increased to ensure that the blank completely fills the shape of the tungsten steel alloy mold cavity 10.

[0026] When the blank reaches the required size, the machine stroke transmits force to the ejector pin 9, which then begins to push the lower core rod 4, which in turn pushes the upper core rod 3, which in turn pushes the formed blank out to the operating clamp position. As the machine stroke progresses, the ejector pin 9 releases its force, and the upper spring 7 returns to its original position within the core tube cavity, pulling back the upper core rod 3 and helping to restore the mold to its initial state. The lower core rod 4 and ejector pin 9 then return to their original positions, allowing for the next mold operation.

[0027] During mold operation, the connection between the core tube 2 and the mold shell 1 is connected through an exhaust channel to ensure smooth exhaust of gas, preventing the gas from affecting mold precision and molding. The installation of a fixed pad can effectively adjust the position of the core tube during mold operation, ensuring precise control of the core tube's insertion depth and relative position throughout the entire production cycle, thereby optimizing the accuracy of each mold fit and ensuring consistency and stability during the molding process.

[0028] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency cold forging die, comprising a die shell (1), characterized in that: A tungsten steel alloy mold cavity (10) is provided inside the mold shell (1), and a mold core tube (2) is connected to the inside of the mold shell (1) via a customized hexagon socket bolt (11). The mold core tube (2) fits the tungsten steel alloy mold cavity (10), an upper core rod (3) is installed inside the mold core tube (2), and a connecting pipe pad (13) is installed at the bottom of the mold core tube (2).

2. The high-efficiency cold forging die according to claim 1, characterized in that: An upper liner (5) is provided at the bottom of the upper core rod (3), an upper spring (7) is sleeved on the outside of the upper core rod (3), a lower core rod (4) is provided inside the upper liner (5), the bottom of the lower core rod (4) is connected to a push rod (9) via a lower spring (8), a lower liner (6) is installed at the bottom of the upper liner (5), and the bottom of the lower liner (6) is installed outside the push rod (9).

3. The high-efficiency cold forging die according to claim 1, characterized in that: An exhaust channel is provided at the connection between the core tube (2) and the mold shell (1) of the mold, and the exhaust channel is adapted to the inner walls of the core tube (2) and the mold shell (1).

4. The high-efficiency cold forging die according to claim 1, characterized in that: A fixing pad (12) is provided between the core mold tube (2) and the mold shell (1); the fixing pad (12) is located at the bottom of the core mold tube (2) and is used to adjust and fix the pressing depth of the core mold tube (2).

5. The high-efficiency cold forging die according to claim 4, characterized in that: The surface of the tungsten steel alloy mold cavity (10) is coated with an anti-wear coating, and the anti-wear coating is a chromium coating.

6. The high-efficiency cold forging die according to claim 1, characterized in that: The upper core rod (3) forms a variable compression force with the mold core tube (2) through the upper spring (7), and the compression force adjusts the spring preload between the upper core rod (3) and the mold core tube (2) according to different requirements of product molding.

7. The high-efficiency cold forging die according to claim 2, characterized in that: The upper liner (5) and the lower liner (6) are matched with each other via a lower spring (8), and the lower spring (8) provides a rebound force inside the mold.

8. The high-efficiency cold forging die according to claim 2, characterized in that: The outer side of the push rod (9) cooperates with the lower liner (6), and the push rod (9) is used to drive the lower core rod (4) to separate from the upper core rod (3).

9. A high-efficiency cold forging process, applied to a high-efficiency cold forging die according to any one of claims 1 to 8, characterized in that: include: The tungsten steel alloy mold cavity (10) is set inside the mold shell (1), and the mold core tube (2) is fixed inside the mold shell (1) by a customized hexagon socket bolt (11), ensuring that the mold core tube (2) and the tungsten steel alloy mold cavity (10) are tightly fitted to provide a stable molding environment, and the upper core rod (3) is installed inside the mold core tube (2), and a connecting pipe pad (13) is installed at the bottom of the mold core tube (2) to ensure the matching accuracy of the mold; An upper gasket (5) is placed at the bottom of the upper core rod (3), and an upper spring (7) is placed on the outside of the upper core rod (3) to provide the necessary compression force. Then, a lower core rod (4) is installed, and its bottom is connected to the top rod (9) through the lower spring (8). A lower gasket (6) is installed at the bottom of the upper gasket (5), and the bottom of the lower gasket (6) is installed outside the top rod (9); An exhaust channel is provided at the connection between the mold core tube (2) and the mold shell (1) to ensure smooth exhaust of gas and avoid gas stagnation during the operation of the mold, which affects the molding effect; A fixing pad (12) is provided at the connection between the core tube (2) and the mold shell (1), and the fixing pad is used to adjust the pressing depth of the core tube (2) relative to the mold shell (1), ensuring that the mold maintains accurate fit during operation. By replacing the fixing pad (12) with different thicknesses, the position of the core tube (2) can be accurately adjusted, thereby ensuring consistency and high precision of the product during the mold forming process; An anti-wear coating is applied to the surface of the tungsten steel alloy mold cavity (10), with chromium coating being the best choice, to enhance the wear resistance of the mold and increase the service life of the mold; By adjusting the preload of the upper spring (7) between the upper core rod (3) and the mold core tube (2), the compression force inside the mold is adjusted according to the molding requirements of different products to ensure stability and accuracy during each molding process; During the forming process, the ejector rod (9) drives the lower core rod (4) to separate from the upper core rod (3), so that the formed blank can be smoothly removed from the mold.

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