Rod-shaped milling cutter structure and production mold thereof

Abstract

The bar-shaped milling cutter structure comprises a bar body, one end of the bar body is a cutter head part, the other end of the bar body is a cutter handle part, a blind hole is formed in the end face of the cutter handle part, the blind hole and the bar body are coaxially arranged, and the production die is fixed to a machine tool. The machine tool is provided with a fixed table top and a movable mechanism; the production mold comprises a female mold plate, a discharging plate and a male mold plate, the male mold plate is fixed to the fixed table top, the female mold plate is connected with the movable end of the movable mechanism and movably arranged relative to the male mold plate, and the discharging plate is located between the male mold plate and the female mold plate and movably connected with the female mold plate through a connecting rod. Due to the arrangement of the blind hole, under the condition that the service life of the cutter is not affected by the cutter handle part of the bar body, precious metal used by cutter materials is saved, and economic benefits are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of milling cutter production, in particular to a structure of a rod-shaped milling cutter and a production mold thereof. Background Art

[0002] With the continuous development and growth of the manufacturing industry, as a commonly used machining tool, the demand for milling cutters is also increasing continuously. The mechanical manufacturing industry requires high precision, high efficiency, high reliability and specialization. Commonly used tool materials include high-speed steel, cemented carbide, superhard materials, etc. Cemented carbide not only has high wear resistance, but also has high toughness (compared with superhard materials), so it has been widely used. Looking ahead, it will still be the most widely used tool material. In recent years, with the rapid development of the 3C industry, the consumption of cemented carbide milling cutters has maintained stable growth, and the scale of cemented carbide milling cutters accounts for more than 60% of the entire milling cutter market.

[0003] The manufacturing method of traditional integral cemented carbide tools is as follows: using a solid cemented carbide rod, precision grinding the outer circle, surface grinding the end face, chamfering, edge opening, and coating. This kind of tool still has certain limitations in actual work, and the reasons are as follows:

[0004] In the actual working process, the tool is generally divided into a tool head part and a tool shank part. The actual part of the tool used for cutting materials is only the tool head part, while the tool shank part only plays the role of cooperating with the fixture to clamp and fix the cutting edge. At the same time, in order to ensure that the tool will not be bent by force, the tool shank part is often designed to be longer than the tool head part. Once the tool head is damaged and scrapped, the entire tool needs to be scrapped, and this will result in waste of precious metal materials.

[0005] Therefore, how to solve the deficiencies of the above-mentioned existing technologies has become the subject to be studied and solved by the utility model. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a structure of a rod-shaped milling cutter and a production mold thereof, aiming to solve the problem that the tool shank part only plays the role of cooperating with the fixture to clamp and fix the cutting edge, but uses more materials. Once the tool head is damaged and scrapped, the entire tool needs to be scrapped, resulting in waste of precious metal materials as mentioned in the above background art.

[0007] To achieve the above purpose, the utility model provides a structure of a rod-shaped milling cutter, including a rod body. One end of the rod body is a tool head part, and the other end is a tool shank part. A blind hole is provided on the end face of the tool shank part, and the blind hole is coaxially arranged with the rod body.

[0008] Further, the top of the blind hole is conical or frustum-shaped.

[0009] To achieve the above object, the present utility model further provides a production mold for a rod-shaped milling cutter structure, and the production mold is fixed on a machine tool; the machine tool is provided with a fixed table surface and a movable mechanism;

[0010] The production mold includes a female template, a stripping plate and a male template. The male template is fixed on the fixed table surface. The female template is connected to the movable end of the movable mechanism and is movably arranged relative to the male template. The stripping plate is located between the male template and the female template and is movably connected to the female template through a connecting rod;

[0011] The movable end of the movable mechanism is used to pull the female template closer to or away from the male template, so that the female template, the stripping plate and the male template are stacked or separated from each other, so that the three have a mold closing state or a mold opening state;

[0012] Wherein, the female template is provided with a pouring port; the stripping plate is provided with a runner, and a plurality of runner openings are arranged in the runner. The male template is provided with a plurality of forming cavities; one end of each forming cavity is open, and the open ends of each forming cavity are respectively arranged corresponding to each runner opening, so as to guide external materials to enter the forming cavity through the runner openings;

[0013] The other end of the forming cavity is a closed end, and the end surface of the closed end is provided with a hole-forming column, and the hole-forming column is coaxially arranged with the forming cavity;

[0014] When the female template, the stripping plate and the male template are in the mold closing state, external materials enter the runner through the pouring port, and after filling the runner, they then fill the corresponding forming cavities through a plurality of runner openings, so as to form a product with a blind hole through the cooperation of the hole-forming column and the forming cavity;

[0015] When the female template, the stripping plate and the male template are in the mold opening state, the female template is separated from the stacked stripping plate and the male template, so that the materials remaining in the runner are exposed. After the female template is separated by a set distance, during the process that the female template pulls the stripping plate through the connecting rod to separate the stripping plate from the male template, the stripping plate separated from the male template tears off the materials adhered between each runner opening and the corresponding forming cavity.

[0016] Further, each hole-forming column extends into the male template along the closed end of the corresponding forming cavity;

[0017] A push rod is sleeved on the side wall of each hole-forming column, and each push rod is located in the corresponding forming cavity to block the closed end of the forming cavity.

[0018] Further, the male template includes a push plate mechanism and a male mold base plate fixedly connected to the fixed table surface. A pair of spaced support plates are provided on the surface of the male mold base plate. A mold core fixing plate is fixedly connected to the side of this pair of support plates away from the male mold base plate. A mold core cavity is provided on the mold core fixing plate, and a product mold core is provided in the mold core cavity. The product mold core has a plurality of through holes;

[0019] The through holes are forming cavities;

[0020] The push plate mechanism is located between this pair of support plates, and the push plate mechanism is slidably arranged relative to this pair of support plates along the axis direction of the through hole. A plurality of ejector pins are provided on the push plate mechanism;

[0021] The push rod is sleeved on the side wall of the ejector pin;

[0022] Each ejector pin respectively passes through each push rod and extends into the interior of the through hole;

[0023] The part of the ejector pin located in the through hole is a forming column arranged to match the blind hole.

[0024] Further, the push plate mechanism includes a pushing plate and a push rod fixing plate fixedly connected to the pushing plate,

[0025] Each of the push rods is arranged to pass through the push rod fixing plate;

[0026] A pushing head is provided on the surface of the pushing plate away from the push rod fixing plate. The pushing head passes through the male mold base plate and is connected to the pushing end of the pushing mechanism exposed on the fixed table surface, so that the push plate mechanism has a pushing state and a gentle state;

[0027] When the push plate mechanism is in the gentle state, the end of each push rod is correspondingly inserted and blocked with the end of each through hole;

[0028] When the push plate mechanism is in the pushing state, the end of each push rod slides into the corresponding through hole to push out the product in the forming cavity.

[0029] Further, an installation groove is provided on the surface of the male mold base plate away from the push plate mechanism. A plurality of stepped holes are provided in the installation groove; each of the stepped holes corresponds to each ejector pin respectively, and the stepped holes can axially limit the ejector pin sleeved in the push rod;

[0030] During use, the ejector pin is inserted into the stepped hole and then inserted into the through hole along the push rod after passing through the pushing plate;

[0031] A blocking block is installed in the installation groove to limit the ejector pin.

[0032] Furthermore, the stripper plate includes a plate body and a mating die core disposed within the plate body and adjacent to the male mold plate. Each of the runner openings has two coaxially arranged portions, and these two portions are respectively located on the plate body and the mating die core. When the material enters the two portions, a gate in the shape of a columnar structure is formed. At the position corresponding to each forming cavity on the surface of the mating die core adjacent to the male mold plate, a stepped groove is provided, and each stepped groove is in communication with each runner opening.

[0033] Furthermore, one end of each runner opening close to the stepped groove is tapered.

[0034] Furthermore, heat dissipation channels are provided on both the stripper plate and the product die core to dissipate the heat of the material.

[0035] Due to the application of the above solution, the present utility model has the following advantages and effects compared with the prior art:

[0036] In the present utility model, through the setting of the blind hole, the precious metal used for the tool material can be saved without affecting the service life of the tool for the shank part of the rod body, thereby improving economic efficiency.

[0037] In the present utility model, the preparation of the product can be realized through the three-plate mold of the female mold plate, the stripper plate and the male mold plate. Compared with the two-plate mold currently used in production, firstly, multiple products can be processed simultaneously and the roundness of the products can be ensured. Secondly, since the production mold of the present utility model is a three-plate mold, there will be no large-scale adhesion between the gate and the product. Thirdly, since it is prepared by the hard alloy feed, the demolding method of the female mold plate, the stripper plate and the male mold plate can quickly separate the gate from the product. That is, when the female mold plate, the stripper plate and the male mold plate are in the demolding state, the female mold plate separates from the stacked stripper plate and the male mold plate, so that the material remaining in the runner is exposed. After the female mold plate is separated by a set distance, during the process that the female mold plate pulls the stripper plate through the connecting rod to make the stripper plate separate from the male mold plate, the stripper plate separated from the male mold plate breaks the material adhered between each runner opening and the corresponding forming cavity.

[0038] At the stepped groove, a material with a protective function can be formed to prevent the product from being damaged when the material is broken (when pulling, the material in the stepped groove can prevent a small amount of material from being directly pulled out from the end of the product by the gate).

[0039] The ejector pin and the through hole form a chamber that matches the rod body, and at the same time, the product is pushed out through the push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Attached Figure 1 is a schematic structural view of the rod body in the embodiment of the present utility model;

[0041] Attached Figure 2Schematic diagram of the structure when the female template, stripping plate, and male template are closed in the embodiment of the present utility model;

[0042] Appendix Figure 3 Schematic diagram of the gate structure in the embodiment of the present utility model;

[0043] Appendix Figure 4 Schematic diagram of the structure of the female template in the embodiment of the present utility model;

[0044] Appendix Figure 5 Schematic diagram of the structure of the runner in the embodiment of the present utility model;

[0045] Appendix Figure 6 Schematic diagram of the structure of the plate body in the embodiment of the present utility model;

[0046] Appendix Figure 7 Schematic diagram of the structure of the mating die core in the embodiment of the present utility model;

[0047] Appendix Figure 8 Schematic diagram of the structure of the die core cavity in the embodiment of the present utility model;

[0048] Appendix Figure 9 For Figure 8 Partial enlarged view of part A therein;

[0049] Appendix Figure 10 Schematic diagram of the structure of the stripping plate in the embodiment of the present utility model;

[0050] Appendix Figure 11 For Figure 10 Partial enlarged view of part B therein;

[0051] Appendix Figure 12 Schematic diagram of the longitudinal sectional structure of the die core fixing plate in the embodiment of the present utility model;

[0052] Appendix Figure 13 Schematic diagram of the structure of the product die core in the embodiment of the present utility model;

[0053] Appendix Figure 14 Schematic diagram of the ejector pin structure in the embodiment of the present utility model;

[0054] Appendix Figure 15 Schematic diagram of the push rod structure in the embodiment of the present utility model;

[0055] Appendix Figure 16 Schematic diagram of the longitudinal sectional structure of the product die core in the embodiment of the present utility model;

[0056] Appendix Figure 17 For Figure 16 Partial enlarged view of part C therein.

[0057] In the above drawings: 1. Rod body; 2. Blind hole; 3. Female template; 4. Stripper plate; 5. Male template; 6. Pouring port; 7. Runner; 8. Runner port; 9. Molding cavity; 10. Step groove; 11. Pusher mechanism; 12. Male mold base plate; 13. Support plate; 14. Mold core fixing plate; 15. Mold core cavity; 16. Product mold core; 17. Penetrating hole; 18. Ejector pin; 19. Pushing plate; 20. Ejector pin fixing plate; 21. Ejector pin; 22. Pushing head; 23. Installation groove; 24. Step hole; 25. Heat dissipation channel; 26. Matching mold core; 27. Plate body; 28. Hole-forming column; 29. Gate; i. Material step; ii. Concave limit. Detailed implementation manners

[0058] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0059] The terms used herein are only for describing specific embodiments and are not intended to limit the present case. Singular forms such as "a", "this", "this", "the present", and "the" also include plural forms as used herein.

[0060] Regarding the "first", "second", etc. used herein, they do not particularly refer to the meaning of order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0061] Regarding the "connection" or "positioning" used herein, it can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, and can also refer to two or more components or devices operating or acting on each other.

[0062] Regarding the "including", "comprising", "having", etc. used herein, they are all open-ended terms, that is, they mean including but not limited to.

[0063] Regarding the terms used herein, unless otherwise specified, they generally have their ordinary meanings in the field, in the context of the present case, and in the context of the specific content. Some terms used to describe the present case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of the present case.

[0064] Such as Figure 1As shown in the figure, the present utility model proposes a structure of a rod-shaped milling cutter, which includes a rod body 1. One end of the rod body 1 is a cutter head portion, and the other end is a handle portion. A blind hole 2 is provided on the end face of the handle portion, and the blind hole 2 is coaxially arranged with the rod body 1.

[0065] In the present utility model, through the setting of the blind hole 2, the handle portion of the rod body 1 can save the precious metal used for the tool material without affecting the service life of the tool, thereby improving economic benefits.

[0066] In some specific embodiments, the top of the blind hole 2 is conical or frustum-shaped. If the top of the blind hole 2 is circular, when using drilling equipment, the forming efficiency is relatively low, so an injection molding method will be adopted. After forming the blind hole 2, in order to make the subsequent rod body 1 easier to separate from the production mold, the top of the blind hole 2 is set as conical or frustum-shaped, because compared with the blind hole 2 with a circular top, the adhesion force between the conical or frustum-shaped and the mold core for forming the blind hole 2 is low. During demolding, the mold core will not easily pull the edge of the blind hole 2, resulting in damage to the inner wall of the blind hole 2.

[0067] As Figures 2 - 17 shown, a production mold for a rod-shaped milling cutter structure is fixed on a machine tool; the machine tool has a fixed table surface and a moving mechanism;

[0068] The production mold includes a female template 3, a stripping plate 4, and a male template 5. The male template 5 is fixed on the fixed table surface. The female template 3 is connected to the moving end of the moving mechanism and is movably arranged relative to the male template 5. The stripping plate 4 is located between the male template 5 and the female template 3 and is movably connected to the female template 3 through a connecting rod; (the connecting rod is a long rod with a long strip-shaped cavity. Two bolts are fixed on the long rod. One is fixed on the female template 3, and the other passes through the cavity and is fixed on the stripping plate 4. When the female template 3 separates from the stripping plate 4, it will drive the long rod to move. When the long rod moves to the end of the cavity and abuts against the other bolt, the stripping plate 4 can be pulled to move).

[0069] The moving end of the moving mechanism is used to pull the female template 3 closer to or away from the male template 5, so that the female template 3, the stripping plate 4, and the male template 5 are stacked or separated from each other, so that the three have a mold closing state or a demolding state;

[0070] Among them, the female template 3 has a pouring port 6; the stripping plate 4 has a runner 7, and a plurality of runner openings 8 are provided in the runner 7. The male template 5 has a plurality of forming cavities 9; one end of each forming cavity 9 is open, and the openings of each forming cavity 9 are respectively arranged corresponding to each runner opening 8 to guide external materials to enter the forming cavity 9 through the runner openings 8;

[0071] The other end of the forming cavity 9 is a closed end, and the end face of the closed end has a hole-forming column 28, and the hole-forming column 28 is coaxially arranged with the forming cavity 9;

[0072] The female template 3, the stripper plate 4 and the male template 5 are in the mold closing state. When the external material enters the runner 7 through the pouring gate 6 and fills the runner 7, it then fills the corresponding molding cavity 9 through a plurality of runner openings 8, so as to form a product with a blind hole 2 through the cooperation of the hole forming column 28 and the molding cavity 9;

[0073] When the female template 3, the stripper plate 4 and the male template 5 are in the demolding state (all three are separated, and they will be fixed by a fixing block with two bolts during transportation, that is, the two bolts are fixed on the female template 3 and the male template 5, so that the three will not shake and separate during transportation), the female template 3 separates from the stacked stripper plate 4 and the male template 5, so that the material remaining in the runner 7 is exposed. After the female template 3 separates by a set distance, during the process that the female template 3 pulls the stripper plate 4 through the connecting rod to make the stripper plate 4 separate from the male template 5, the stripper plate 4 separated from the male template 5 breaks the material adhered between each runner opening 8 and the corresponding molding cavity 9.

[0074] In the present utility model, the preparation of the product can be realized through the three-plate mold of the female template 3, the stripper plate 4 and the male template 5. Compared with the two-plate mold used in current production, firstly, multiple products can be processed simultaneously. Secondly, since the production mold of the present utility model is a three-plate mold, there will be no large-scale adhesion between the gate 29 and the product. Thirdly, since it is prepared by hard alloy feeding, the demolding method of the female template 3, the stripper plate 4 and the male template 5 can quickly separate the gate 29 from the product with the blind hole 2, that is, when the female template 3, the stripper plate 4 and the male template 5 are in the demolding state, the female template 3 separates from the stacked stripper plate 4 and the male template 5, so that the material remaining in the runner 7 is exposed. After the female template 3 separates by a set distance, during the process that the female template 3 pulls the stripper plate 4 through the connecting rod to make the stripper plate 4 separate from the male template 5, the stripper plate 4 separated from the male template 5 breaks the material adhered between each runner opening 8 and the corresponding molding cavity 9.

[0075] It should be noted that the principle of manufacturing the rod body 1 through the production mold in the present utility model can refer to the injection mold. Specifically: select 80 - 95wt.% of 0.2 - 1.0μm WC powder, 5 - 20wt.% of 0.5 - 2.0μm Co powder, and additionally add 0.2 - 1.5wt.% of Cr3C2 or VC powder. First, add the raw materials into a ball mill, use organic solvents (such as anhydrous ethanol, acetone, hexane, etc.) as the grinding medium, add 0 - 2% paraffin wax as the forming agent, and ball mill for 12 - 48h to obtain a uniformly mixed slurry. Dry and spray granulate the slurry to obtain a mixed material. Add the weighed mixed material into a mixer, add 4 - 8% of the forming agent. The composition of the forming agent is 30 - 70wt.% of wax (such as paraffin wax, microcrystalline wax, beeswax, etc., alone or in combination), 10 - 50wt.% of PE, 10 - 50% of PP, and additionally add 1 - 5% of stearic acid as a surfactant. The mixing temperature is 160 - 180°C, and the mixing time is 1.5 - 3h. After mixing, cool down and granulate to obtain a cemented carbide injection molding feedstock. Add the cemented carbide feedstock into an injection molding machine to injection mold it into a round rod with holes and chamfers (i.e., the rod body 1).

[0076] In some specific embodiments, each hole-forming column 28 extends along the closed end of the corresponding molding cavity 9 into the male mold plate 5;

[0077] A push rod 21 is sleeved on the side wall of each hole-forming column 28, and each push rod 21 is located in the corresponding molding cavity 9 to block the closed end of the molding cavity 9.

[0078] Since the blind hole 2 is provided on the rod body 1, if the blind hole 2 faces the gate 29, that is, the runner port 8, it is difficult to form the blind hole 2. Therefore, the blind hole 2 should face the other end of the molding cavity 9. However, when facing this end, there are several forms of product detachment:

[0079] 1. The hole-forming column 28 independently pushes the product out of the molding cavity 9, while the push rod 21 remains stationary and always blocks the closed end of the molding cavity 9;

[0080] 2. The hole-forming column 28 and the push rod 21 together push the product out of the molding cavity 9;

[0081] 3. The push rod 21 independently pushes the product out of the molding cavity 9, while the hole-forming column 28 remains stationary.

[0082] In some specific embodiments, the male mold plate 5 includes a push plate mechanism 11 and a male mold base plate 12 fixedly connected to the fixed table surface. A pair of spaced support plates 13 are provided on the surface of the male mold base plate 12. A mold core fixing plate 14 is fixedly connected to the side of this pair of support plates 13 away from the male mold base plate 12. A mold core cavity 15 is provided on the mold core fixing plate 14, and a product mold core 16 is provided in the mold core cavity 15. The product mold core 16 has a plurality of through holes 17;

[0083] The through hole 17 is the forming cavity 9;

[0084] The ejector plate mechanism 11 is located between this pair of support plates 13, and the ejector plate mechanism 11 is slidably arranged relative to this pair of support plates 13 along the axis direction of the through hole 17. A plurality of ejector pins 18 are provided on the ejector plate mechanism 11;

[0085] The push rod 21 is sleeved on the side wall of the ejector pin 18;

[0086] Each ejector pin 18 respectively passes through each push rod 21 and extends into the interior of the through hole 17;

[0087] The part of the ejector pin 18 located in the through hole 17 is the hole-forming column 28 that is matched with the blind hole 2.

[0088] The hole-forming column 28 can be directly fixed at the closed end of the forming cavity 9 (the end of the push rod 21 in the through hole 17), or integrally formed with the push rod 21, or axially slidably arranged relative to the push rod 21. Since it is necessary to prevent the hole-forming column 28 from bending, it is preferably that the hole-forming column 28 is axially slidably arranged relative to the push rod 21.

[0089] That is, the position of the blind hole 2 is filled by the ejector pin 18, so that a cavity matched with the rod body 1 can be formed through the cooperation of the ejector pin 18 and the through hole 17 (that is, this cavity is the forming cavity 9 with the hole-forming column 28 arranged inside). After the subsequent material enters the forming cavity 9, the blind hole 2 can be formed by the ejector pin 18.

[0090] When pushing out later, directly drive the ejector plate mechanism 11 to push the push rod 21 to push the product out of the forming cavity 9.

[0091] In some specific embodiments, the ejector plate mechanism 11 includes a pushing plate 19 and a push rod fixing plate 20 fixedly connected to the pushing plate 19,

[0092] Each push rod 21 is passed through the push rod fixing plate 20;

[0093] A pushing head 22 is provided on the surface of the pushing plate 19 away from the push rod fixing plate 20. The pushing head 22 passes through the male mold base plate 12 and is connected to the pushing end of the pushing mechanism exposed on the fixed table surface, so that the ejector plate mechanism 11 has a pushing state and a smooth state;

[0094] When the ejector plate mechanism 11 is in the smooth state, the end of each push rod 21 is correspondingly inserted and blocked with the end of each through hole 17;

[0095] When the ejector plate mechanism 11 is in the pushing state, the end of each push rod 21 slides into the corresponding through hole 17 to push out the product in the forming cavity 9.

[0096] Therefore, the thimble 18 is arranged to axially slide relative to the push rod 21 because, due to the small size of the thimble 18, if the thimble 18 repeatedly pushes the product, the thimble 18 is likely to bend or the end part is distorted. Therefore, the push rod 21 is used to push the product.

[0097] Specifically, when the push plate mechanism 11 is in a flat state (Figs. 2 - 17 are all in this state), the end of each push rod 21 is correspondingly inserted into and blocks the end of each through hole 17, which means that one end of the through hole 17 is blocked by the end of the push rod 21, and the other end is aligned with the stepped groove 10 on the discharge plate 4. Once the material enters the forming cavity 9, a product can be formed.

[0098] After that, it is necessary to demold and unload the product, that is, first demold, and then use the pushing end of the pushing mechanism on the fixed table to push the pushing head 22, so that the pushing plate 19 moves towards the push rod fixing plate 20, and the pushing plate 19 pushes the push rod fixing plate 20 and all the push rods 21 to move towards the product together. At this time, the end of each push rod 21 slides into the corresponding through hole 17, and the product in the forming cavity 9 is pushed out. During this process, the thimble 18 cannot move.

[0099] In some specific embodiments, an installation groove 23 is provided on the surface of the male mold base plate 12 away from the push plate mechanism 11, and a plurality of stepped holes 24 are provided in the installation groove 23; each stepped hole 24 is correspondingly arranged with each thimble 18, and the stepped hole 24 can axially limit the thimble 18 sleeved in the push rod 21;

[0100] During use, the thimble 18 is inserted into the stepped hole 24, passes through the pushing plate 19 and then is inserted into the through hole 17 along the push rod 21;

[0101] A blocking block is installed in the installation groove 23 to limit the thimble 18.

[0102] The following fixing method is provided for the thimble 18. Specifically, first insert the thimble 18 into the stepped hole 24, pass through the pushing plate 19 and then insert it into the through hole 17 along the push rod 21. Then, install the blocking block in the installation groove 23 so that the thimble 18 is fixed on the male mold base plate 12.

[0103] In this way, the thimble 18 can be restricted by the male mold base plate 12 and cannot slide along the axis of the forming cavity 9.

[0104] In some specific embodiments, the stripper plate 4 includes a plate body 27 and a mating die core 26 disposed within the plate body 27 and near the male mold plate 5 side (the mating die core 26 can be fixed to the plate body 27 by screws, for example). Each of the runner openings 8 has two coaxially arranged portions, and these two portions are respectively located on the plate body 27 and the mating die core 26. When the material enters the two portions, a columnar gate 29 is formed (the gate 29 is the residual material within the runner opening 8, and after being adhesively fixed to the residual material in the runner 7, the gate 29 can be grabbed and pulled out by a manipulator); on the surface of the mating die core 26 near the male mold plate 5 side at the corresponding position of each molding cavity 9, a stepped groove 10 is provided, and each stepped groove 10 is correspondingly connected to each runner opening 8.

[0105] Reference can be made to Figure 5 , Figure 6 , Figure 7 and Figure 10 , the mating die core 26 and the plate body can be connected by screws to prevent blockage of the runner opening 8. Secondly, a material step i with a protective function can be formed at the stepped groove 10 to prevent the product from being damaged when the material is torn off.

[0106] To facilitate the separation of the material from the product: one end of each runner opening 8 near the stepped groove 10 is tapered. The taper can reduce the adhesion amount between the gate 29 and the product.

[0107] In some specific embodiments, heat dissipation channels 25 are provided on both the stripper plate 4 and the product die core 16 to dissipate the heat of the material.

[0108] The heat dissipation channel 25 includes a coolant flow channel provided on the stripper plate 4 and the product die core 16 and inlet and outlet copper tubes provided at the ends of the coolant flow channel.

[0109] It should be noted that: the ends of the push rod 21 and the ejector pin 18 can be provided with countersinks (i.e., the round platforms provided at the ends of the push rod 21 and the ejector pin 18), and corresponding countersunk holes are provided at the through holes of the stepped holes 24 and the push rod 21 on the push rod fixing plate 20.

[0110] Working principle:

[0111] The main difference between this application and the prior art is as follows: 1. This application uses a three-plate mold, while the prior art often uses a two-plate mold;

[0112] 2. A material step i with a protective function can be formed at the stepped groove 10 to prevent the product from being damaged when the material is torn off (during pulling, the material step i can prevent a small amount of material from being directly pulled out from the end of the product by the gate 29). At the same time, the formation of the material step i can also reduce the connection amount between the gate 29 and the product, facilitating the separation of the gate 29 from the product.

[0113] 3. The ejector pin 18 and the through hole 17 form a chamber that is arranged to match the rod body 1. Meanwhile, the product is pushed out by the push rod 21.

[0114] 4. The handle part of the rod body 1 has a chamfer, which is convenient for tool clamping. Therefore, a matching concave limit ii can be set on the push rod 21.

[0115] Therefore, the assembly methods of other components in this application are the same as those of the three-plate injection mold, except for the fixing methods of the ejector pin 18 and the push rod 21. Therefore, the ejector pin 18 and the push rod 21 should be installed first before use.

[0116] The following fixing methods are provided for the ejector pin 18 and the push rod 21 (since multiple ejector pins 18 and push rods 21 are provided, the following description is made with one ejector pin 18 and one push rod 21). Specifically, first pass the push rod 21 through the push rod fixing plate 20, and at the same time make the end of the push rod 21 inserted into and block the end of the corresponding through hole 17. Then, guide the ejector pin 18 to insert into the stepped hole 24, and after passing through the push plate 19, insert it along the push rod 21 into the interior of the through hole 17. Then, install a blocking block in the installation groove 23 so that the ejector pin 18 is fixed on the male mold base plate 12.

[0117] Then, the movable end of the movable mechanism can be used to pull the female mold plate 3 closer to or away from the male mold plate 5, so that the female mold plate 3, the stripping plate 4, and the male mold plate 5 are stacked or separated from each other, so that the three have a mold closing state and a demolding state.

[0118] When the female mold plate 3, the stripping plate 4, and the male mold plate 5 are in the mold closing state, external materials enter the runner 7 through the pouring gate 6. After filling the runner 7, the corresponding molding cavities 9 are filled through a plurality of runner openings 8 to form a product with a blind hole 2 in the molding cavity 9.

[0119] When the female mold plate 3, the stripping plate 4, and the male mold plate 5 are in the demolding state, the female mold plate 3 is separated from the stacked stripping plate 4 and male mold plate 5, so that the materials remaining in the runner 7 are exposed. After the female mold plate 3 is separated by a set distance, during the process that the female mold plate 3 pulls the stripping plate 4 through the connecting rod to make the stripping plate 4 separate from the male mold plate 5, the stripping plate 4 separated from the male mold plate 5 breaks the materials adhered between each runner opening 8 and the corresponding molding cavity 9.

[0120] After that, the product is separated from the molding cavity 9. At this time, the pushing end of the pushing mechanism on the fixed tabletop is used to push the pushing head 22, so that the push plate 19 moves in the direction of the push rod fixing plate 20. Then, the push plate 19 pushes the push rod fixing plate 20 and all the push rods 21 to move towards the product together. At this time, the end of each push rod 21 slides into the corresponding through hole 17 to push out the product in the molding cavity 9. During this process, the ejector pin 18 cannot move.

[0121] The above embodiments are only used to illustrate the technical concept and features of the present utility model. The purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly, and it should not be used to limit the protection scope of the present utility model. Any equivalent changes or modifications made according to the spirit and essence of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A production mold for a rod-shaped milling cutter structure, the production mold is fixed on a machine tool; characterized in that: The machine tool has a fixed table and a movable mechanism; The milling cutter structure comprises a rod body, one end of the rod body is a cutter head, the other end is a cutter handle, the end surface of the cutter handle is provided with a blind hole, the blind hole is coaxially arranged with the rod body, and the top of the blind hole is conical or frustum-shaped; The production mold includes a female template, a discharge plate and a male template. The male template is fixed on a fixed table. The female template is connected to the movable end of the movable mechanism and is movably arranged relative to the male template. The discharge plate is located between the male template and the female template and is movably connected to the female template through a connecting rod. The movable end of the movable mechanism pulls the female template closer to or away from the male template, so that the female template, the stripper plate and the male template are stacked or separated from each other, so that the three are in a mold closing state or a demolding state; The female mold plate has a pouring port; the unloading plate has a flow channel, and a plurality of flow channel openings are arranged in the flow channel; the male mold plate has a plurality of molding cavities; one end of each molding cavity is open, and the open end of each molding cavity is respectively arranged corresponding to each flow channel opening, so as to guide external materials into the molding cavity through the flow channel opening; The other end of the molding cavity is a closed end, and the end surface of the closed end is provided with a hole-forming column, and the hole-forming column is coaxially arranged with the molding cavity; When the female mold plate, the unloading plate and the male mold plate are in the mold-closing state, the external material enters the runner through the pouring port, and after filling the runner, it fills the corresponding molding cavity through multiple runner ports, so that the product with blind holes is formed through the cooperation of the hole-forming column and the molding cavity; When the female template, the unloading plate and the male template are in the demolding state, the female template separates from the stacked unloading plate and the male template to expose the material remaining in the flow channel. After the female template separates from the set distance, the female template pulls the unloading plate through the connecting rod to separate the unloading plate from the male template. In the process, the unloading plate separated from the male template tears off the material adhered between each flow channel opening and the corresponding molding cavity.

2. The production mold of the rod-shaped milling cutter structure according to claim 1, characterized in that: Each hole-forming column extends into the male mold plate along the closed end of the corresponding molding cavity; The side wall of each hole-forming column is sleeved with a push rod, and each push rod is located in the corresponding forming cavity to block the closed end of the forming cavity.

3. The production mold of the rod-shaped milling cutter structure according to claim 2, characterized in that: The male mold plate includes a push plate mechanism and a male mold base plate fixedly connected to the fixed table, a pair of spaced support plates are provided on the surface of the male mold base plate, a mold core fixing plate is fixedly connected to the side of the pair of support plates away from the male mold base plate, a mold core cavity is provided on the mold core fixing plate, a product mold core is provided in the mold core cavity, and a plurality of through holes are provided on the product mold core; The penetration hole is a forming cavity; The push plate mechanism is located between the pair of support plates, and is slidably arranged relative to the pair of support plates along the axial direction of the penetration hole, and a plurality of ejector pins are arranged on the push plate mechanism; The push rod is sleeved on the side wall of the ejector pin; Each ejector pin passes through each push rod and extends to the inside of the penetration hole; The part of the ejector pin located in the penetration hole is a hole-forming column matched with the blind hole.

4. The production mold of the rod-shaped milling cutter structure according to claim 3, characterized in that: The push plate mechanism includes a push plate and a push rod fixing plate fixedly connected to the push plate. Each push rod is inserted into the push rod fixing plate; A push head is provided on the surface of the push plate on one side away from the push rod fixed plate, and the push head passes through the male mold base plate and is connected to the push end of the push mechanism exposed on the fixed table surface, so that the push plate mechanism has a push state and a gentle state; When the push plate mechanism is in a flat state, the end of each push rod and the end of each penetration hole are correspondingly plugged and blocked; When the push plate mechanism is in the push piece state, the end of each push rod slides into the corresponding penetration hole to push the product in the molding cavity out.

5. The production mold of the rod-shaped milling cutter structure according to claim 4, characterized in that: A mounting groove is provided on the surface of the male mold base plate on one side away from the push plate mechanism, and a plurality of stepped holes are provided in the mounting groove; each stepped hole is respectively provided corresponding to each ejector pin, and the stepped hole can axially limit the ejector pin sleeved in the ejector rod; When in use, the ejector pin is inserted into the stepped hole and then inserted into the penetration hole along the push rod after passing through the push plate; A blocking block is installed in the installation groove to limit the ejector pin.

6. The production mold of the rod-shaped milling cutter structure according to claim 1, characterized in that: The unloading plate includes a plate body and a matching mold core arranged in the plate body and close to one side of the male mold plate, and each flow channel opening has two parts arranged coaxially, and the two parts are respectively located on the plate body and the matching mold core; When the material enters the two parts, a gate with a columnar structure is formed; A stepped groove is arranged on one side surface of the matching mold core close to the male mold plate at a position corresponding to each molding cavity, and each stepped groove is correspondingly connected to each flow channel opening.

7. The production mold of the rod-shaped milling cutter structure according to claim 1, characterized in that: One end of each flow channel opening close to the stepped groove is tapered.

8. The production mold of the rod-shaped milling cutter structure according to claim 3, characterized in that: Heat dissipation channels are provided on the unloading plate and the product mold core to dissipate the heat of the material.

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