A die stamping mechanism

Abstract

This utility model provides a die stamping mechanism, belonging to the technical field of stamping mechanisms. The die stamping mechanism includes a lower die base, an upper die base positioned above the lower die base, a stamping head fixedly installed at the bottom of the upper die base, and at least two guide pillars. The guide pillars are vertically fixed to the upper surface of the lower die base. The upper die base has through guide holes corresponding to the positions of the guide pillars. A self-lubricating guide sleeve is fixedly installed within the guide holes. Multiple annular oil reservoirs are spaced along the axial direction on the inner wall of the self-lubricating guide sleeve, and these reservoirs are filled with solid lubricant. The guide pillars pass through the self-lubricating guide sleeve and slide in cooperation with it. The self-lubricating guide sleeve is made of copper-based powder metallurgy material, and its outer circumferential surface is interference-fitted with the inner wall of the guide hole. This solves the problems of insufficient lubrication, easy wear, and poor stamping accuracy stability in traditional die stamping mechanisms.

Description

Technical Field

[0001] This utility model belongs to the field of stamping mechanism technology, and more specifically, relates to a mold stamping mechanism. Background Technology

[0002] Die stamping mechanisms are key equipment in manufacturing used for stamping and forming metal or non-metal materials. Through the relative movement of the stamping head and die, external force is used to induce plastic deformation or separation of the workpiece, thereby obtaining products of the desired shape and size. They are widely used in automobile manufacturing, electronic components, and home appliance production. The stability, precision, and service life of the mechanism directly affect product quality and production efficiency. Die stamping mechanisms mainly consist of upper and lower die bases, guide structures, stamping heads, and power transmission components. Among these, the guide structure is the core component ensuring stamping precision; its performance determines the alignment accuracy of the upper and lower dies during the stamping process. Traditional die stamping mechanisms have numerous drawbacks. Regarding guide lubrication, traditional mechanisms often use lubricating oil to lubricate the mating surfaces of the guide pillars and guide sleeves, which is prone to oil leakage, contaminating the mold and workpiece, and requiring frequent oil replenishment, resulting in high maintenance costs. After prolonged use, the lubricating oil is prone to failure due to high temperatures or impurities, leading to accelerated wear of the guide structure and affecting guiding accuracy. The connection between the guide pillar and the lower die base is mostly fixed; when the guide pillar is worn or damaged, the entire lower die base must be disassembled for replacement, a complex and time-consuming operation. Traditional guide sleeves are often a single-material, integral structure, resulting in uneven lubrication and potential jamming due to insufficient lubrication in certain areas. Furthermore, the installation stability of the guide sleeves in traditional stamping mechanisms is insufficient, and axial movement can easily occur after long-term use, affecting guiding accuracy. During the stamping power transmission process, if the connection structure is not strong enough or the center is offset, uneven stamping force distribution can easily occur, causing workpiece deformation or mold damage. Simultaneously, the die replacement of traditional mechanisms is inconvenient, lacking versatility and failing to meet the needs of multi-variety, small-batch production, thus hindering the improvement of production efficiency. Utility Model Content

[0003] In view of this, the present invention provides a mold stamping mechanism that solves the problems of insufficient guide lubrication, easy wear, and poor stamping accuracy stability of traditional mold stamping mechanisms.

[0004] This utility model is implemented as follows: This utility model provides a die stamping mechanism, comprising: a lower die base, an upper die base disposed above the lower die base, a stamping head fixedly installed at the bottom of the upper die base, and at least two guide posts. The guide posts are vertically fixed to the upper surface of the lower die base. The upper die base has through guide holes corresponding to the positions of the guide posts. A self-lubricating guide sleeve is fixedly installed in the guide holes. The inner wall of the self-lubricating guide sleeve is provided with a plurality of annular oil reservoirs spaced along its axial direction. The annular oil reservoirs are filled with solid lubricant. The guide posts pass through the self-lubricating guide sleeve and slide in cooperation with the self-lubricating guide sleeve.

[0005] The technical advantages of the die stamping mechanism provided by this utility model are as follows: By setting vertically fixed guide pillars in the lower die base, and cooperating with the self-lubricating guide sleeve in the guide hole of the upper die base, a precise guiding structure is formed, ensuring that the stamping head will not deviate during the up-and-down movement, thus improving stamping accuracy. The annular oil reservoir on the inner wall of the self-lubricating guide sleeve is filled with solid lubricant. When the guide pillar and the guide sleeve slide together, the solid lubricant continuously lubricates the contact surface, reducing friction and wear between them and extending the service life of the guiding structure. Compared with traditional lubricating oil, solid lubricant will not leak, avoiding contamination of the die and workpiece, and maintaining a clean stamping environment. The setting of multiple guide pillars further enhances the stability of the upper die base movement and prevents tilting during the stamping process.

[0006] Based on the above technical solution, the die stamping mechanism of this utility model can be further improved as follows: The self-lubricating guide sleeve is made of copper-based powder metallurgy material, and its outer circumferential surface is fixed with the inner wall of the guide hole by interference fit.

[0007] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The self-lubricating guide sleeve made of copper-based powder metallurgy material has a certain self-lubricating property, which, combined with solid lubricant, forms a dual lubrication effect, further reducing the coefficient of friction. Copper-based powder metallurgy material has good wear resistance and thermal conductivity, and can withstand the frictional heat generated during the sliding of the guide post, avoiding structural damage due to overheating. The interference fit fixing method between the outer circumference of the self-lubricating guide sleeve and the inner wall of the guide hole ensures that the guide sleeve will not loosen during long-term use, guaranteeing the stability of guiding accuracy, and the installation process is simple and reliable.

[0008] Furthermore, the cross-section of the annular oil reservoir is U-shaped, the spacing between adjacent annular oil reservoirs is equal, and the depth of the annular oil reservoir is 1 / 3 to 1 / 2 of the wall thickness of the self-lubricating guide sleeve.

[0009] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the U-shaped cross-section annular oil reservoir can effectively store solid lubricant, prevent lubricant from being lost too quickly, and ensure the durability of lubrication effect. The design of equal spacing between adjacent annular oil reservoirs ensures that all parts of the guide post surface are uniformly lubricated, avoiding increased wear caused by insufficient local lubrication. The depth of the annular oil reservoir is set to 1 / 3 to 1 / 2 of the guide sleeve wall thickness, which ensures sufficient oil storage capacity without excessively weakening the structural strength of the guide sleeve, ensuring that the guide sleeve can withstand the lateral force transmitted by the guide post.

[0010] Furthermore, the solid lubricant is a graphite-based grease, and its filling amount does not exceed 90% of the volume of the annular oil reservoir.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: Graphite-based grease, as a solid lubricant, has excellent lubrication performance, high temperature resistance, and stability, and can still maintain good lubrication effect under the frictional heat generated during the stamping process. The filling amount does not exceed 90% of the volume of the annular oil reservoir, leaving room for the volume expansion of the lubricant when the temperature changes, avoiding the lubricant being squeezed out of the oil reservoir due to overfilling, while ensuring that there is enough lubricant supplied to the friction contact surface.

[0012] Furthermore, a tapered guide head is provided at the top of the guide post, and the diameter of the tapered guide head gradually increases from the top to the bottom, with the maximum diameter of the tapered guide head being smaller than the inner diameter of the self-lubricating guide sleeve.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The tapered guide head design at the top of the guide post can play a guiding role during the initial mold closing of the stamping mechanism or when the guide post is inserted into the guide sleeve, enabling the guide post to quickly and accurately enter the self-lubricating guide sleeve, reducing alignment time and operational difficulty. The setting that the maximum diameter of the tapered guide head is smaller than the inner diameter of the guide sleeve avoids rigid collision between the guide head and the guide sleeve, protects the end structure of the guide sleeve and the guide post, and reduces the risk of damage during installation.

[0014] Furthermore, a stamping power connection seat is provided on the top of the upper die holder. The stamping power connection seat is integrally formed with the upper die holder, and the central axis of the stamping power connection seat coincides with the central axis of the stamping head.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The stamping power connecting seat at the top of the upper die holder is integrally formed with the upper die holder, which enhances the structural strength of the connection part, can reliably transmit stamping power, and avoids stamping force loss or structural deformation caused by loose connection. The design of the stamping power connecting seat coinciding with the central axis of the stamping head allows the stamping power to be transmitted to the stamping head along the central axis, ensuring uniform stamping force distribution, reducing damage to the die and workpiece caused by eccentric stamping, and improving the quality stability of stamped parts.

[0016] Furthermore, the self-lubricating guide sleeve is provided with outwardly extending annular limiting flanges at both ends. The outer diameter of the annular limiting flange is larger than the diameter of the guide hole, and the annular limiting flange is in contact with the surface of the upper mold base.

[0017] The beneficial effects of the above-mentioned improved scheme are as follows: the annular limiting flanges at both ends of the self-lubricating guide sleeve can accurately position the axial position of the guide sleeve within the guide hole, ensuring that the guide sleeve will not move axially after installation. The annular limiting flange, with an outer diameter larger than the guide hole diameter and in close contact with the upper mold base surface, increases the contact area between the guide sleeve and the upper mold base, dispersing the axial force on the guide sleeve. It also acts as a seal, preventing dust and impurities from entering the mating gap between the guide sleeve and the guide post, thus protecting the lubrication environment.

[0018] Furthermore, the bottom of the guide column is fixedly connected to the lower mold base via a flange, and the flange is detachably connected to the lower mold base via bolts.

[0019] The fixed connection is set to connect the bottom of the guide column to the flange by welding. The axis of the guide column coincides with the central axis of the flange. The weld joint forms a continuous circumferential weld along the outer periphery of the guide column, ensuring that the two are rigidly connected as one unit without relative displacement. The detachable connection is configured with multiple through holes evenly spaced along the circumference of the flange (no fewer than four through holes). A threaded hole matching the through holes is pre-drilled at the corresponding position on the lower mold base, with a thread depth not less than 1.5 times the effective thread length of the bolt. The bolt passes through the through holes of the flange and is threaded into the threaded hole of the lower mold base. The bolt head has a countersunk head structure, and a corresponding countersunk hole is formed on the flange surface, allowing the bolt head to be recessed into the countersunk hole and not protrude above the flange surface.

[0020] Furthermore, the inner wall of the self-lubricating guide sleeve is provided with an axial lubrication groove between the annular oil reservoirs, and the axial lubrication groove is connected to the annular oil reservoir.

[0021] The beneficial effects of the above-mentioned improvement scheme are as follows: Axial lubrication grooves are set between the annular oil reservoirs on the inner wall of the self-lubricating guide sleeve, and are connected to the annular oil reservoirs to form a mesh-like lubrication channel. This allows the solid lubricant to be evenly distributed along the axial and annular directions to the entire inner wall of the guide sleeve, ensuring that the guide post is adequately lubricated at different positions. The axial lubrication grooves can guide the lubricant to diffuse to both ends when the guide post moves, avoiding local lubricant accumulation or insufficiency, and further improving the uniformity and durability of the lubrication effect.

[0022] Furthermore, a stamping die is provided on the lower die base at the position corresponding to the stamping head. The stamping die is detachably connected to the lower die base, and the central axis of the stamping die is coaxial with the central axis of the stamping head.

[0023] The diameter of the flange through-hole is slightly larger than the bolt shank diameter (gap controlled at 0.2-0.5mm) to ensure smooth bolt insertion. The threaded hole of the lower mold base adopts a blind hole design, with a safety margin between the bottom of the hole and the lower surface of the lower mold base to prevent the threaded hole from penetrating the lower mold base. High-strength hexagonal head bolts are selected, and a torque wrench is used to tighten them to the specified torque during assembly. The fit accuracy between the bolt and the threaded hole is 6H / 6g. The mating surfaces of the flange and the lower mold base are both surface ground, with a flatness error of no more than 0.05mm / m. Thin metal gaskets can be placed between the mating surfaces to eliminate assembly gaps and enhance connection sealing. When it is necessary to disassemble the guide column, simply rotate the bolt in the opposite direction to separate the flange from the lower mold base, achieving quick disassembly and assembly of the guide column.

[0024] Compared with the prior art, the beneficial effects of the die stamping mechanism provided by this utility model are: This utility model's die stamping mechanism, through structural optimization and innovative design, brings several significant benefits. Regarding guiding accuracy, the precise fit between the guide pillars and the self-lubricating guide sleeve, combined with the symmetrical arrangement of multiple guide pillars, effectively ensures the stability of the upper die holder's movement, preventing offset or tilting during the stamping process and significantly improving the dimensional accuracy and consistency of the stamped parts. The smoother sliding fit between the self-lubricating guide sleeve and the guide pillar reduces the jamming phenomenon caused by insufficient lubrication in traditional structures, making the stamping action more stable. In terms of lubrication performance, the annular oil reservoir of the self-lubricating guide sleeve, in conjunction with the solid lubricant, achieves long-lasting and continuous lubrication, eliminating the need for frequent lubricant additions and reducing maintenance workload. The solid lubricant prevents leakage, maintaining a clean stamping environment and avoiding the problem of traditional lubricating oil contaminating workpieces and molds, while also reducing lubricant waste. The copper-based powder metallurgy material of the guide sleeve itself possesses self-lubricating properties, forming a dual lubrication effect with the solid lubricant, significantly reducing friction and wear on the guide structure and extending the service life of the guide post and guide sleeve. In terms of structural stability, the guide post is connected to the lower die base via a flange, increasing the stress-bearing area and making the guide post installation more secure, thus better able to withstand lateral forces during the stamping process. The annular limiting flanges at both ends of the self-lubricating guide sleeve effectively prevent axial movement of the guide sleeve, ensuring the stability of guiding accuracy. The integrated design of the stamping power connection seat and the upper die base enhances the reliability of power transmission, avoids power loss or structural deformation, and ensures uniform distribution of stamping pressure. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an example diagram of a die stamping mechanism; Figure 2 This is a side view of a die stamping mechanism; Figure 3 A perspective view of a die stamping mechanism; The attached diagram lists the components represented by each number as follows: 10. Lower die holder; 20. Upper die holder; 21. Self-lubricating guide sleeve; 211. Annular oil reservoir; 22. Axial lubrication groove; 30. Stamping head; 40. Guide post. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0028] like Figures 1-3 The diagram shown is an example of a die stamping mechanism provided by this utility model, which includes a lower die base 10, an upper die base 20 disposed above the lower die base 10, a stamping head 30 fixedly installed at the bottom of the upper die base 20, and at least two guide posts 40. The guide posts 40 are vertically fixed to the upper surface of the lower die base 10. The upper die base 20 has through guide holes corresponding to the positions of the guide posts 40. A self-lubricating guide sleeve 21 is fixedly installed in the guide hole. The inner wall of the self-lubricating guide sleeve 21 has a plurality of annular oil reservoirs 211 spaced along its axial direction. The annular oil reservoirs 211 are filled with solid lubricant. The guide posts 40 pass through the self-lubricating guide sleeve 21 and slide in cooperation with the self-lubricating guide sleeve 21.

[0029] Usage steps: Check the annular oil reservoir on the inner wall of the self-lubricating guide sleeve to ensure that the solid lubricant is adequately filled. If insufficient, add graphite-based grease to within 90% of the reservoir volume. The self-lubricating guide sleeve is interference-fitted into the guide hole of the upper mold base, ensuring that the annular limiting flanges at both ends are tightly fitted to the surface of the upper mold base. The guide post is vertically fixed to the lower mold base using flanges and bolts, ensuring that the guide post is securely installed and perpendicular to the surface of the lower mold base. Based on the requirements of the stamping workpiece, select the corresponding stamping die, detachably install it onto the lower die base, and adjust the position of the die so that its central axis is coaxial with the central axis of the stamping head to be installed. The stamping head is fixedly installed at the bottom of the upper die holder, ensuring that the stamping head is firmly connected to the upper die holder and that the central axis of the stamping head coincides with the central axis of the stamping power connection seat. Align the guide hole of the upper die base with the guide post of the lower die base, so that the guide post passes into the self-lubricating guide sleeve. Manually drive the upper die base to move up and down, and check whether the guide structure is smooth and without jamming, to ensure that the stamping head and stamping die are accurately aligned. Place the workpiece to be stamped on the stamping die, connect the external stamping power source through the stamping power connector, start the stamping mechanism, and the upper die seat drives the stamping head to move downward. Under the precise guidance of the guide post and the self-lubricating guide sleeve, the stamping head and the stamping die cooperate to complete the stamping of the workpiece. Regularly check the lubrication of the self-lubricating guide sleeve and replenish it in time when the solid lubricant is insufficient; if the guide column or guide sleeve is severely worn, replace the corresponding parts through the detachable connection structure to ensure the continuous and stable operation of the stamping mechanism.

[0030] In the above technical solution, the self-lubricating guide sleeve 21 is made of copper-based powder metallurgy material, and its outer peripheral surface is fixed with the inner wall of the guide hole by interference fit.

[0031] Furthermore, in the above technical solution, the cross-section of the annular oil reservoir 211 is U-shaped, the spacing between adjacent annular oil reservoirs 211 is equal, and the depth of the annular oil reservoir 211 is 1 / 3 to 1 / 2 of the wall thickness of the self-lubricating guide sleeve 21.

[0032] Furthermore, in the above technical solution, the solid lubricant is a graphite-based grease, and its filling amount does not exceed 90% of the volume of the annular oil reservoir 211.

[0033] Furthermore, in the above technical solution, a tapered guide head is provided at the top of the guide post 40. The diameter of the tapered guide head gradually increases from the top to the bottom, and the maximum diameter of the tapered guide head is smaller than the inner diameter of the self-lubricating guide sleeve 21.

[0034] Furthermore, in the above technical solution, a stamping power connection seat is provided on the top of the upper die holder 20. The stamping power connection seat is integrally formed with the upper die holder 20, and the central axis of the stamping power connection seat coincides with the central axis of the stamping head 30.

[0035] Furthermore, in the above technical solution, the two ends of the self-lubricating guide sleeve 21 are respectively provided with outwardly extending annular limiting flanges. The outer diameter of the annular limiting flange is larger than the diameter of the guide hole, and the annular limiting flange is in contact with the surface of the upper mold base 20.

[0036] Furthermore, in the above technical solution, the bottom of the guide column 40 is fixedly connected to the lower mold base 10 via a flange, and the flange is detachably connected to the lower mold base 10 via bolts.

[0037] Furthermore, in the above technical solution, the inner wall of the self-lubricating guide sleeve 21 is provided with an axial lubrication groove 22 between the annular oil storage grooves 211, and the axial lubrication groove 22 is connected to the annular oil storage grooves 211.

[0038] Furthermore, in the above technical solution, a stamping die is provided on the lower die base 10 at the position corresponding to the stamping head 30. The stamping die is detachably connected to the lower die base 10, and the central axis of the stamping die is coaxial with the central axis of the stamping head 30.

[0039] First embodiment: The stamping mechanism of this embodiment includes a lower die base, an upper die base, a stamping head, four guide pillars, and a stamping die. The lower die base is made of gray cast iron, and the guide pillars are fixed at the four corners of its upper surface by flanges. Locating pins are provided between the flanges and the lower die base, and a detachable connection is achieved by four high-strength bolts. The top of the guide pillars is equipped with a tapered guide head. The upper die base is made of cast steel, and the top is an integrally formed stamping power connection seat. The central axis of the upper die base coincides with the bottom stamping head, and the stamping head is fixed to the upper die base by bolts. A copper-based powder metallurgy self-lubricating guide sleeve is installed in the guide hole of the upper die holder with an interference fit. The guide sleeve has annular limiting flanges at both ends that fit against the surface of the upper die holder. Five U-shaped annular oil reservoirs are distributed axially along the inner wall and filled with graphite-based grease. There are no axial lubrication grooves between the oil reservoirs. The stamping die is installed in the middle of the lower die holder through a T-slot structure. The die and the stamping head are coaxially arranged. This implementation method is suitable for medium-batch metal sheet stamping production, especially for stamping flat workpieces in automotive parts. The technical benefits are as follows: the copper-based powder metallurgy guide sleeve and graphite grease form a highly efficient lubrication system, reducing guide post wear by more than 40%; the flange and locating pin connection method controls the guide post perpendicularity error to within 0.02mm / m, improving the dimensional accuracy of stamped parts; the one-piece molded power connector ensures stable stamping force transmission, increasing the workpiece qualification rate to over 99.5%, and extending the maintenance cycle to twice that of traditional mechanisms.

[0040] Second embodiment: The stamping mechanism in this embodiment consists of an aluminum alloy lower die base, a welded steel plate upper die base, a stamping head, two guide pillars, and a stamping die. The bottom flange of the guide pillars is connected to the lower die base via anti-loosening bolts. The contact surface between the flange and the lower die base has anti-slip textures, and the tapered guide head at the top of the guide pillars has rounded corners. A stamping power connection seat is welded to the top of the upper die base and undergoes aging treatment to relieve stress. The bottom stamping head is fixed to the upper die base with bolts after positioning using a tenon and mortise structure. A self-lubricating guide sleeve made of oil-impregnated bearing material is installed inside the guide hole of the upper die holder. The outer circumference of the guide sleeve is interference-fitted with the guide hole. The width of the annular limiting flanges at both ends is increased. The inner wall is provided with three annular oil reservoirs and an axial lubrication groove connecting the oil reservoirs, filled with high-purity graphite lubricant. The lower die holder uses magnetic assisted positioning and bolts to install the stamping die. Die replacement does not require special tools. This implementation method is suitable for stamping small batches of various light industrial products, such as appliance casing parts. The technical benefits are as follows: the combination of the oil-impregnated bearing guide sleeve and axial lubrication groove improves lubrication uniformity and reduces the operating noise of the guide structure by 15 decibels; the aluminum alloy lower die base reduces equipment weight, and the anti-slip flange connection shortens installation and debugging time by 30%; the magnetic positioning die reduces die change time to less than 5 minutes; the clearance between the guide sleeve and guide post is stabilized between 0.01-0.03mm, meeting the precision requirements of various workpieces, and reducing overall energy consumption by 10%. Specifically, the principle of this utility model is as follows: Guided precision control is one of the core principles. Vertically fixed guide pillars are installed in the lower die base, forming a sliding fit with the self-lubricating guide sleeve in the guide hole of the upper die base. This precise fit restricts the lateral displacement of the upper die base, ensuring that the stamping head always moves along a preset trajectory during its up-and-down movement, achieving precise alignment with the die cavity. The tapered guide head at the top of the guide pillar, through its inclined surface, reduces the initial alignment difficulty, ensuring the guide pillar can smoothly enter the guide sleeve and avoiding damage to the structure from rigid collisions. The symmetrical distribution of multiple guide pillars further disperses lateral forces, enhancing the overall guiding stability and preventing the upper die base from tilting during the stamping process. The principle of friction lubrication optimization is reflected in the structural design of the self-lubricating guide sleeve. The copper-based powder metallurgy material itself has a porous structure, which can adsorb and store lubricant, forming the basis for the material's self-lubrication. The annular oil reservoir on the inner wall stores solid lubricant. When the guide column and guide sleeve move relative to each other, the lubricant is evenly transferred to the contact surface through friction, forming a lubricating film and reducing the coefficient of friction. The axial lubrication groove is connected to the annular oil reservoir, forming a mesh-like lubrication channel, allowing the lubricant to diffuse along the axial and annular directions, ensuring that the entire contact surface is fully lubricated and avoiding localized dry friction. The selection of solid lubricant utilizes its high stability and low leakage characteristics to achieve long-term lubrication and reduce the need for lubrication maintenance. The principle of structural mechanics balance is applied throughout the entire mechanism design. The guide column is connected to the lower die base via a flange, increasing the contact area to distribute stress, improve connection strength, and enable the guide column to reliably withstand lateral forces during stamping without easily deforming. The annular limiting flange of the self-lubricating guide sleeve, through its contact with the surface of the upper die base, distributes axial force over a larger area, preventing damage caused by excessive localized stress on the guide sleeve. The stamping power connection seat coincides with the central axis of the stamping head, ensuring that the stamping force is transmitted along the axis, avoiding additional torque caused by eccentric forces, reducing the risk of deformation of the die and mechanism, ensuring uniform stamping force distribution, and improving the quality of stamped parts.

Claims

1. A die stamping mechanism characterized by: The device includes a lower die base, an upper die base disposed above the lower die base, a stamping head fixedly installed at the bottom of the upper die base, and at least two guide posts. The guide posts are vertically fixed to the upper surface of the lower die base. The upper die base has through guide holes corresponding to the positions of the guide posts. A self-lubricating guide sleeve is fixedly installed in the guide holes. The inner wall of the self-lubricating guide sleeve is provided with multiple annular oil reservoirs spaced along its axial direction. The annular oil reservoirs are filled with solid lubricant. The guide posts pass through the self-lubricating guide sleeve and slide in cooperation with the self-lubricating guide sleeve.

2. A die stamping mechanism according to claim 1, wherein The self-lubricating guide sleeve is made of copper-based powder metallurgy material, and its outer circumferential surface is fixed with the inner wall of the guide hole by interference fit.

3. A die-stamping mechanism according to claim 2, wherein The annular oil reservoir has a U-shaped cross-section, and the spacing between adjacent annular oil reservoirs is equal. The depth of the annular oil reservoir is 1 / 3 to 1 / 2 of the wall thickness of the self-lubricating guide sleeve.

4. A die-stamping mechanism according to claim 3, wherein The solid lubricant is a graphite-based grease, and its filling amount does not exceed 90% of the volume of the annular oil reservoir.

5. A die-stamping mechanism according to claim 4, wherein The top of the guide post is provided with a tapered guide head, the diameter of which gradually increases from the top to the bottom, and the maximum diameter of the tapered guide head is smaller than the inner diameter of the self-lubricating guide sleeve.

6. A die-stamping mechanism according to claim 5, wherein The upper die holder is provided with a stamping power connection seat on its top. The stamping power connection seat is integrally formed with the upper die holder, and the central axis of the stamping power connection seat coincides with the central axis of the stamping head.

7. A die-stamping mechanism according to claim 6, wherein The self-lubricating guide sleeve has outwardly extending annular limiting flanges at both ends. The outer diameter of the annular limiting flange is larger than the diameter of the guide hole, and the annular limiting flange is in contact with the surface of the upper mold base.

8. A die-stamping mechanism according to claim 7, wherein The bottom of the guide column is fixedly connected to the lower mold base via a flange, and the flange is detachably connected to the lower mold base via bolts.

9. A die-stamping mechanism according to claim 8, wherein The inner wall of the self-lubricating guide sleeve is provided with an axial lubrication groove between the annular oil reservoirs, and the axial lubrication groove is connected to the annular oil reservoir.

10. A die-stamping mechanism according to claim 9, wherein A stamping die is provided on the lower die base at the position corresponding to the stamping head. The stamping die is detachably connected to the lower die base, and the central axis of the stamping die is coaxial with the central axis of the stamping head.

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