Sintering mold for CBN polycrystalline production

Abstract

The utility model relates to the technical field of CBN (Cubic Boron Nitride) glomerocryst forming, and discloses a sintering mould for CBN glomerocryst production, which comprises a bottom plate, a lifting frame, an outer sleeve, a heating cylinder, a heat insulation cylinder, a mould core and a holding-up hammer assembly. According to the sintering mold for CBN glomerocryst production, the heating cylinder is arranged, the heating cylinder provides main power for the double-layer spiral heating wire and the first electric heating wire with high density in the inner layer, the second electric heating wire with low density in the outer layer compensates edge heat dissipation, it can be ensured that the hardness of a product is improved in the sintering process, the heat stability is enhanced, and through the special structure of the mold core, the product quality is improved. And through the special structure of the outer sleeve, the device can be rapidly cooled after solidification is needed during sintering.

Description

Technical Field

[0001] This utility model relates to the field of CBN polycrystalline molding technology, specifically a sintering mold for CBN polycrystalline production. Background Technology

[0002] CBN polycrystalline, or polycrystalline cubic boron nitride, is an aggregate formed by the agglomeration of many fine-grained cubic boron nitride. The sintering mold used in the production of CBN polycrystalline is the core tool for realizing the sintering of CBN micro powder into polycrystalline. Its role runs through the entire high-temperature and high-pressure sintering process, directly affecting the product's performance, dimensional accuracy, and production efficiency.

[0003] However, most existing sintering molds adopt a single-layer heating structure, which results in a large temperature gradient in the synthesis cavity, affecting the uniformity of CBN grains and causing poor sintering effect. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To overcome the aforementioned deficiencies of the prior art, this utility model provides a sintering mold for CBN polycrystalline production, which solves the problems in the prior art:

[0006] Most sintering molds adopt a single-layer heating structure, which leads to a large temperature gradient in the synthesis cavity, affecting the uniformity of CBN grains and resulting in poor sintering effect.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a sintering mold for CBN polycrystalline production, comprising a base plate, a lifting frame fixedly mounted on the top of the base plate, an outer sleeve sleeved at the top center of the base plate, a heating cylinder threaded inside the outer sleeve, a heat insulation cylinder threaded inside the heating cylinder, a mold core sleeved inside the heat insulation cylinder, and a top hammer assembly movably mounted inside the mold core. The inner wall of the outer sleeve, the outer surface of the heating cylinder, and the outer surface of the heat insulation cylinder are all provided with installation threads for easy installation. The heating cylinder contains a double-layered spiral heating wire, consisting of a first heating wire and a second heating wire, with the pitch of the first heating wire being smaller than the pitch of the second heating wire. A wire is provided at the top of the heating cylinder.

[0009] Optionally, a limit post is provided at the top center of the base plate to ensure the stability of the mold during use.

[0010] Optionally, a through-hole is provided at the bottom center of the outer sleeve, and multiple rectangular heat dissipation fins are uniformly arranged in a ring on the outer surface of the outer sleeve.

[0011] Optionally, the bottom of the mold core has a hollow guide hole, the inside of the mold core has a synthesis cavity, the top opening of the synthesis cavity is slightly larger than the bottom opening to facilitate mold guiding, and the outer surface of the mold core has multiple annular heat dissipation grooves.

[0012] Optionally, the ejector assembly includes: an upper ejector, a column, a lower ejector, a sealing ring, and a handle. The lower ejector is snapped into the inner bottom of the mold core, and the upper ejector is snapped into the inside of the mold core and installed perpendicular to the mold core's axis. A sealing ring is fitted onto the outer surface of the upper ejector. A column is provided at the top of the upper ejector, and the column is fitted into the middle of the lifting frame. Its top end penetrates the lifting frame and is placed at the top of the lifting frame. A handle is fixedly installed at the top of the column and is placed at the top of the lifting frame. The bottom end face of the upper ejector is a spherical structure.

[0013] (III) Beneficial Effects

[0014] This utility model provides a sintering mold for CBN polycrystalline production, which has the following beneficial effects:

[0015] This sintering mold for CBN polycrystalline production features a heating cylinder with double-layered spiral heating wires. The inner high-density first heating wire provides the main power, while the outer low-density second heating wire compensates for edge heat dissipation. This design ensures increased product hardness and enhanced thermal stability during sintering. The special structure of the mold core facilitates rapid demolding of the formed product, and the special structure of the outer sleeve allows for rapid cooling of the device after solidification during sintering. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the outer sleeve of this utility model.

[0018] Figure 3 This is a schematic diagram of the installation sequence of this utility model;

[0019] Figure 4 This is a cross-sectional view of the heating cylinder of this utility model.

[0020] Figure 5 This is a cross-sectional view of the mold core of this utility model.

[0021] Figure 6 This is a cross-sectional structural diagram of the top hammer and column of this utility model.

[0022] In the diagram: 1. Base plate; 2. Lifting frame; 3. Outer sleeve; 4. Heating cylinder; 5. Heat insulation cylinder; 6. Mold core; 7. Top hammer assembly; 101. Limiting post; 301. Limiting hole; 302. Rectangular heat dissipation fins; 401. First electric heating wire; 402. Second electric heating wire; 403. Wire; 601. Guide hole; 602. Combination cavity; 603. Annular heat dissipation groove; 701. Upper top hammer; 702. Column; 703. Lower top hammer; 704. Sealing ring; 705. Handle. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by those skilled in the art. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Example 1:

[0026] Please see Figures 1 to 6 This utility model provides a technical solution: a sintering mold for CBN polycrystalline production, which is equipped with a device base plate 1 and a lifting frame 2 to ensure stability during use;

[0027] The base plate 1 is included, and a lifting frame 2 is fixedly installed on the top of the base plate 1. A limit post 101 is set in the middle of the top of the base plate 1 to ensure the stability of the mold during use. Therefore, the base plate 1 is set with a limit post 101 at the top to facilitate the installation with the limit post 101 at the bottom of the outer sleeve 3. The lifting frame 2 is set to ensure the installation of the top hammer assembly 7.

[0028] Example 2:

[0029] To facilitate the installation and disassembly of the device, an outer sleeve 3, a heating cylinder 4, a heat insulation cylinder 5, and a mold core 6 are provided;

[0030] An outer sleeve 3 is fitted onto the top center of the base plate 1. A heating cylinder 4 is threaded inside the outer sleeve 3, and a heat insulation cylinder 5 is threaded inside the heating cylinder 4. A mold core 6 is fitted inside the heat insulation cylinder 5. Installation threads are provided on the inner wall of the outer sleeve 3, the outer surface of the heating cylinder 4, and the outer surface of the heat insulation cylinder 5 for easy installation. A double-layered spiral heating wire is installed inside the heating cylinder 4, consisting of a first heating wire 401 and a second heating wire 402. The pitch of the first heating wire 401 is smaller than the pitch of the second heating wire 402. A wire 403 is installed at the top of the heating cylinder 4. A penetrating limiting hole 301 is provided at the bottom center of the outer sleeve 3. Multiple rectangular heat dissipation fins 302 are evenly arranged in a ring on the outer surface of the outer sleeve 3. A hollow guide hole 601 is provided at the bottom of the mold core 6, and a synthesis cavity 602 is provided inside the mold core 6. The top opening is slightly larger than the bottom opening to facilitate mold guiding. Multiple annular heat dissipation grooves 603 are provided on the outer surface of the mold core 6. Therefore, the first electric heating wire 401 provides the main heating power to ensure that the center temperature of the molding cavity 602 reaches the required level. The second electric heating wire 402 compensates for edge heat dissipation, and the heat insulation cylinder 5 reduces heat loss, thus reducing energy consumption compared to traditional molds. The wire 403 allows connection to an external power source during use to ensure normal operation of the device. The limiting hole 301 ensures that the device is placed stably on the top of the base plate 1. The rectangular heat dissipation fins 302 ensure rapid solidification during solidification. The guide hole 601 allows the product inside the mold core 6 to be pushed out by the push rod when it cannot be demolded. The molding cavity 602 facilitates product molding. The annular heat dissipation grooves 603 improve radial heat conduction, resulting in a lower circumferential temperature difference in the mold core 6.

[0031] Example 3:

[0032] To ensure stability during CBN molding, a top hammer assembly 7 is provided;

[0033] An ejector assembly 7 is movably installed inside the mold core 6. The ejector assembly 7 includes: an upper ejector 701, a column 702, a lower ejector 703, a sealing ring 704, and a handle 705. The lower ejector 703 is snapped into the bottom of the mold core 6. The upper ejector 701 is snapped into the inside of the mold core 6 and installed perpendicular to the axis of the mold core 6. The outer surface of the upper ejector 701 is fitted with a sealing ring 704. A column 702 is provided on the top of the upper ejector 701. The column 702 is fitted into the middle of the lifting frame 2, and its top end penetrates the lifting frame 2 and is placed on the top of the lifting frame 2. A handle 705 is fixedly installed on the top end of the column 702. At the top of the lifting frame 2, the bottom end face of the upper hammer 701 is a spherical structure. Therefore, the lower hammer 703 is set at the bottom of the synthesis chamber 602. After CBN is sintered and formed, the lower hammer 703 can be pushed by the push rod to push the product out. The end face of the upper hammer 701 is a convex spherical surface. The spherical structure concentrates the pressure in the center of the synthesis chamber 602, reduces the contact area, and improves the pressure transmission efficiency. The column 702 is set with a handle 705 fixed at the top. The user can hold the handle 705 to control the upper hammer 701 to move up and down. The sealing ring 704 is set to ensure the tightness of the synthesis chamber 602.

[0034] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that provides control.

[0035] In this invention, the working steps of the device are as follows:

[0036] First, wipe the inside of the synthesis cavity 602 of the mold core 6 and the spherical end face of the top hammer assembly 7 with anhydrous ethanol to ensure there is no oil or impurities. Check if the heating assembly is intact; if damaged, replace it. Slide the heat insulation cylinder 5 onto the outside of the mold core 6, ensuring a tight interference fit. You can use a rubber mallet to gently tap it to assist in the installation. Screw the heating assembly onto the outside of the heat insulation cylinder 5. Place the assembled device vertically into the outer sleeve 3. Rotate the outer sleeve 3 to make the outer thread of the heating assembly engage with the inner thread of the outer sleeve 3. Place the top hammer 703 at the bottom of the synthesis cavity 602 of the mold core 6. Then, place the installed device on the top of the base plate 1 through the limiting post 101 and the limiting hole 301. Install the top hammer 701 on the top of the device. Pass the lifting frame 2 through the column 702 and then fix the handle 705. It is then ready for use.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sintering mold for CBN polycrystalline production, comprising a base plate (1), characterized in that: A lifting frame (2) is fixedly installed on the top of the base plate (1). An outer sleeve (3) is sleeved in the middle of the top of the base plate (1). A heating cylinder (4) is connected to the inner thread of the outer sleeve (3). A heat insulation cylinder (5) is connected to the inner thread of the heating cylinder (4). A mold core (6) is sleeved inside the heat insulation cylinder (5). A top hammer assembly (7) is movably installed inside the mold core (6). The inner wall of the outer sleeve (3), the outer surface of the heating cylinder (4), and the outer surface of the heat insulation cylinder (5) are all provided with installation threads for easy installation. A double-layer spiral heating wire is provided inside the heating cylinder (4). The double-layer spiral heating wire is a first electric heating wire (401) and a second electric heating wire (402). The pitch of the first electric heating wire (401) is smaller than the pitch of the second electric heating wire (402). A wire (403) is provided on the top of the heating cylinder (4).

2. The sintering mold for CBN polycrystalline production according to claim 1, characterized in that: A limit post (101) is provided at the top center of the base plate (1) to ensure the stability of the mold during use.

3. The sintering mold for CBN polycrystalline production according to claim 1, characterized in that: The outer sleeve (3) has a through-hole (301) at the bottom center, and the outer surface of the outer sleeve (3) is uniformly provided with a plurality of rectangular heat dissipation fins (302) in a ring.

4. A sintering mold for CBN polycrystalline production according to claim 1, characterized in that: The bottom of the mold core (6) is provided with a hollow guide hole (601), and the inside of the mold core (6) is provided with a synthesis cavity (602). The top opening of the synthesis cavity (602) is slightly larger than the bottom opening to facilitate mold guiding. The outer surface of the mold core (6) is provided with multiple annular heat dissipation grooves (603).

5. A sintering mold for CBN polycrystalline production according to claim 1, characterized in that: The top hammer assembly (7) includes: an upper top hammer (701), a column (702), a lower top hammer (703), a sealing ring (704), and a handle (705). The lower top hammer (703) is snapped into the bottom of the mold core (6). The upper top hammer (701) is snapped into the inside of the mold core (6) and is installed perpendicular to the mold core (6) on the axis. The outer surface of the upper top hammer (701) is fitted with a sealing ring (704). The top of the upper top hammer (701) is provided with a column (702). The column (702) is fitted into the middle of the lifting frame (2), and its top end penetrates the lifting frame (2) and is placed on the top of the lifting frame (2). The top end of the column (702) is fixedly installed with a handle (705). The handle (705) is placed on the top of the lifting frame (2). The bottom end face of the upper top hammer (701) is a spherical structure.

Images