Preforming device of polycrystalline diamond wire-drawing die core

Abstract

The utility model discloses a pre-forming device of a polycrystalline diamond wire-drawing die core, which belongs to the technical field of superhard materials and comprises an upper metal cup and a lower metal cup, a metal grid formed by splicing a plurality of metal foils through socket grooves is arranged in the lower metal cup, and the metal grid is arranged on the lower metal cup. The metal grid is composed of a plurality of non-feeding cavities and a plurality of hexagonal or circular feeding cavities, the non-feeding cavities are used for containing filler, the feeding cavities are used for containing polycrystalline diamond powder formed through pressing, inner cobalt sheets used for sealing the feeding cavities are arranged above the feeding cavities, outer cobalt sheets are arranged above the inner cobalt sheets, and the outer cobalt sheets are used for sealing the feeding cavities. And the lower metal cup is sleeved outside the upper metal cup. According to the utility model, the ablation damage caused by laser cutting is avoided, the cobalt removal effect can be realized while the forming device is removed, and the produced wire-drawing die core product has the advantages of high production efficiency, low production cost, good heat resistance and higher edge performance than the traditional product.

Description

Technical Field

[0001] This utility model relates to the field of superhard materials technology, and in particular to a preforming device for preforming polycrystalline diamond wire drawing die cores. Background Technology

[0002] Polycrystalline diamond (PCD) wire drawing dies are made of polycrystalline diamond and are one of the main forming die materials in the wire drawing process of various metal wire products. They possess high wear resistance, high temperature resistance, good chemical stability, and excellent dimensional stability, making them widely used in metal wire drawing. Compared to another type of wire drawing die—monocrystalline diamond—PCD dies have superior isotropic physical properties, avoiding abnormal cracking at the dissociation surface caused by the anisotropy of monocrystalline diamond during preparation and use. Furthermore, compared to the newer CVD diamond wire drawing dies, PCD dies offer significant advantages in cost-effectiveness and mechanical properties. Therefore, PCD dies are currently the most widely used diamond wire drawing dies on the market.

[0003] Existing polycrystalline diamond (PCD) wire drawing dies are mainly made by cutting and grinding pre-synthesized PCD bulk materials, with the outer edge surface primarily formed by laser cutting. Since laser cutting operates on a high-temperature ablation principle, it inevitably causes some thermal damage to the wire drawing die itself. Furthermore, because a single piece of PCD is often used to cut multiple wire drawing dies, the cutting time is long, impacting processing efficiency. Additionally, the small amount of carbon slag generated on the cutting surface during laser cutting can negatively affect subsequent assembly. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the preparation process of polycrystalline diamond wire drawing dies by providing a preforming device for preforming polycrystalline diamond wire drawing dies. On the one hand, it enables product preforming, reduces processing rate, improves production efficiency, and reduces production costs; on the other hand, it avoids the ablation effect of laser cutting on the product itself, and can improve the product performance to a certain extent.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A preforming device for polycrystalline diamond wire drawing core includes an upper metal cup and a lower metal cup. The lower metal cup contains a metal mesh composed of multiple metal foil sheets spliced ​​together by slots. The metal mesh consists of multiple non-feeding cavities and multiple hexagonal or circular feeding cavities. The non-feeding cavities are used to place fillers, and the feeding cavities are used to place pressed polycrystalline diamond powder 3. An inner cobalt sheet is provided above the feeding cavities to close them, and an outer cobalt sheet is provided above the inner cobalt sheet. The lower metal cup is sleeved outside the upper metal cup.

[0007] The upper metal cup and the lower metal cup are zirconium cups, niobium cups, molybdenum cups, or tantalum cups, and the wall thickness of the upper metal cup and the lower metal cup is 0.076-0.3 mm.

[0008] The metal foil is a strip-shaped zirconium foil, niobium foil, molybdenum foil, or tantalum foil. A slot with a width of 1 / 2 of the metal foil is opened on one side along the length direction. The metal foil is lower than the height of the lower metal cup.

[0009] The slot width of the socket is slightly larger than the thickness of the metal foil, and the difference between the height of the metal foil and the lower metal cup is the thickness of the outer cobalt sheet.

[0010] The filler is any one or more of sodium chloride, magnesium oxide, and dolomite.

[0011] The inner cobalt sheet has the same size as the cross-section of the feeding cavity, the outer cobalt sheet has the same size as the inner diameter of the lower metal cup, and the thickness of the inner and outer cobalt sheets is 0.1-0.3 mm.

[0012] The inner diameter of the upper metal cup is slightly larger than the outer diameter of the lower metal cup, and the upper metal cup is intermittently fitted with the lower metal cup by means of a sleeve.

[0013] Compared with the prior art, the technical effects and advantages of this utility model are as follows:

[0014] 1. This utility model adopts a partition plate + filler to achieve pre-forming of the wire drawing die core, and its outer edge dimensions achieve near-net-shape forming, eliminating the cutting process and completely avoiding the ablation effect of laser cutting on the product.

[0015] 2. The partition plate used in this utility model is made by inserting metal foil sheets, which is convenient to process and has high autonomy in shape and size, making it easy for manufacturers to achieve production of various specifications.

[0016] 3. This utility model, through the design of inner and outer double-layer cobalt sheets, not only achieves clean sealing of the internal diamond powder, but also replenishes the cobalt element of the inner cobalt sheet while sealing the filler, making the synthesis and molding easier.

[0017] 4. This utility model can both guarantee the final shape of the wire drawing die core and remove cobalt elements from the inside of the wire drawing die core, thereby achieving the temperature resistance performance of the wire drawing die core during use. Attached Figure Description

[0018] Figure 1 A schematic diagram of the metal foil insert-type separator in this utility model;

[0019] Figure 2This utility model provides a schematic diagram of the preparation, trimming, and assembly of a partition plate;

[0020] Figure 3 Another schematic diagram of the preparation, trimming and assembly of the separator plate according to this utility model;

[0021] Figure 4 for Figure 2 A schematic diagram showing the distribution of the compacted filler.

[0022] Figure 5 for Figure 3 A schematic diagram showing the distribution of the compacted filler.

[0023] Figure 6 for Figure 4 A cross-sectional view along the diameter.

[0024] A schematic diagram illustrating the relationship between the eccentric rotation buckle at the end of the rotary handle and the base plate before and after rotation in this utility model.

[0025] In the figure, 1. lower metal cup, 2. metal foil, 201. socket, 202. feeding cavity, 203. non-feeding cavity, 3. polycrystalline diamond powder, 4. filler, 5. inner cobalt sheet, 6. outer cobalt sheet, 7. upper metal cup. Detailed Implementation

[0026] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The preformed polycrystalline diamond wire drawing die core and its preformation device involved in this utility model are not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Example 1

[0027] Reference Figure 1 , 2 4, 6. This utility model provides a pre-forming device for polycrystalline diamond wire drawing die cores, wherein the pre-formed polycrystalline diamond wire drawing die core is a hexagonal prism, synthesized from diamond micron powder and a binder under high temperature and high pressure. The diameter of the inscribed circle of the wire drawing die core is 3.2 mm, and the thickness is 1.5 mm. The average diamond particle size of the wire drawing die core is 25 μm, and the binder content is 5% wt.

[0028] The preforming device includes an upper metal cup 7 and a lower metal cup 1. The lower metal cup 1 is provided with a metal grid formed by splicing multiple metal foils 2 through slots 201 and 201. The metal grid is composed of multiple non-feeding cavities and multiple hexagonal or circular feeding cavities 202. The non-feeding cavities are used to place filler 4, and the feeding cavities 202 are used to place pressed polycrystalline diamond powder 3. An inner cobalt sheet 5 is provided above the feeding cavity 202 to close the feeding cavity 202, and an outer cobalt sheet 6 is provided above the inner cobalt sheet 5. The lower metal cup 1 is sleeved on the upper metal cup 7.

[0029] Among them, the upper metal cup 7 and the lower metal cup 1 are tantalum cups, and the wall thickness of the upper metal cup 7 and the lower metal cup 1 is 0.13mm.

[0030] The metal foil 2 is a long strip of zirconium foil. A slot 201, half the width of the foil, is formed on one side along its length. The slot width is slightly greater than the foil thickness, and the metal foil 2 is lower than the height of the lower metal cup 1. The 24 metal foils are combined at the slot 201 by insertion to form multiple hexagonal feeding cavities 202. The height of the inner partition is slightly lower than the inner height of the lower metal cup 1; the difference is equal to the thickness of the outer cobalt sheet 6.

[0031] Among them, filler 4 is magnesium oxide powder, but in this utility model, it can also be sodium chloride or dolomite powder.

[0032] The inner cobalt sheet 5 has the same size as the cross-section of the feeding cavity 202, the outer cobalt sheet 6 has the same size as the inner diameter of the lower metal cup 1, and the thickness of the inner cobalt sheet 5 and the outer cobalt sheet 6 is 0.1 mm.

[0033] The inner diameter of the upper metal cup 7 is slightly larger than the outer diameter of the lower metal cup 1, and the upper metal cup 7 and the lower metal cup 1 are intermittently fitted together by means of a sleeve.

[0034] The method of using the preforming device for polycrystalline diamond wire drawing die core in this embodiment is as follows:

[0035] 1) Cut or stamp out the slot 201 at a specific position from the long strip of metal foil 2.

[0036] 2) The slotted metal foils are spliced ​​together into a complete metal grid through the slot 201.

[0037] 3) Trim the outer edge of the metal mesh according to the shape of the metal cup 1, and then put it into the lower metal cup 1.

[0038] 4) After the diamond micro powder and binder are mixed evenly in a specific ratio, they are dry-pressed into shape according to the feeding cavity 202. Then, the pressed polycrystalline diamond powder 3 is placed into the corresponding feeding cavity 202, and an inner cobalt sheet 5 is placed on the powder block to achieve sealing.

[0039] 5) Put the filler 4 into all the non-feeding cavities 203 and compact it.

[0040] 6) Insert the outer cobalt sheet 6 from the upper part of the lower metal cup 1, and then install the metal cup 7.

[0041] 7) The composite is loaded into the synthesis block for high-temperature and high-pressure synthesis.

[0042] 8) The two ends of the synthesized blank are ground until the product height meets the requirements. Then the semi-finished product is placed in strong acid for treatment. After treatment and cleaning, the pre-formed polycrystalline diamond wire drawing die core is obtained. Example 2

[0043] refer to Figure 3 , 5 This embodiment provides a preforming device for polycrystalline diamond wire drawing die cores. In this embodiment, the metal mesh consists of multiple non-feeding cavities and multiple circular feeding cavities 202. To form the circular feeding cavities 202, the metal foil is bent into multiple tangent semicircles before grooving. The receiving slots 201 are located at each tangent point. The usage methods of other structures and devices are the same as in Embodiment 1, and will not be repeated here.

[0044] Polycrystalline wire drawing dies and their preforming devices achieve near-net-shape forming of the final product dimensions, avoiding the thermal ablation damage of traditional products during laser processing, while improving production efficiency and reducing production costs. During the removal process in strong acid, the forming device also takes into account the cobalt removal effect on the wire drawing die core, further improving the heat resistance of the product.

[0045] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

Claims

1. A preforming device for polycrystalline diamond wire drawing die cores, characterized in that: The device includes an upper metal cup and a lower metal cup. The lower metal cup contains a metal mesh composed of multiple metal foil sheets joined together by slots. The metal mesh consists of multiple non-feeding cavities and multiple hexagonal or circular feeding cavities. The non-feeding cavities are used to place fillers, and the feeding cavities are used to place pressed polycrystalline diamond powder. An inner cobalt sheet is provided above the feeding cavities to close them, and an outer cobalt sheet is provided above the inner cobalt sheet. The lower metal cup is fitted over the upper metal cup.

2. The preforming device for polycrystalline diamond wire drawing die cores according to claim 1, characterized in that: The upper metal cup and the lower metal cup are zirconium cups, niobium cups, molybdenum cups, or tantalum cups, and the wall thickness of the upper metal cup and the lower metal cup is 0.076-0.3 mm.

3. The preforming device for polycrystalline diamond wire drawing die cores according to claim 1, characterized in that: The metal foil is a long strip of zirconium foil, niobium foil, molybdenum foil or tantalum foil, and a slot with a width of 1 / 2 of its length is opened on one side of the metal foil. The metal foil is lower than the height of the lower metal cup.

4. The preforming device for polycrystalline diamond wire drawing die cores according to claim 3, characterized in that: The slot width of the socket is greater than the thickness of the metal foil, and the difference in height between the metal foil and the lower metal cup is the thickness of the outer cobalt sheet.

5. The preforming device for polycrystalline diamond wire drawing die cores according to claim 1, characterized in that: The filler is any one or more of sodium chloride, magnesium oxide, and dolomite.

6. The preforming device for polycrystalline diamond wire drawing die cores according to claim 1, characterized in that: The inner cobalt sheet has the same size as the cross-section of the feeding cavity, the outer cobalt sheet has the same size as the inner diameter of the lower metal cup, and the thickness of the inner and outer cobalt sheets is 0.1-0.3 mm.

7. The preforming device for polycrystalline diamond wire drawing die cores according to claim 1, characterized in that: The inner diameter of the upper metal cup is slightly larger than the outer diameter of the lower metal cup, and they are intermittently fitted together by means of a sleeve.

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