Die for correcting inner diameter and outer diameter of hard alloy ring
By designing a correction mold for cemented carbide ring, the problem of excessive size during sintering is solved, and the effect of reducing waste rate and production cost is achieved.
Patent Information
- Application Number
- CN202421905760.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-07
AI Technical Summary
During the sintering process, cemented carbide ring products have over-size due to uneven density distribution, resulting in high product waste rate and increased production costs.
A correction mold with inner and outer diameter of a cemented carbide ring is designed, including a first graphite outer ring, a first graphite inner plug and a first weighting member. By matching the inner and outer diameter size and shape of the cemented carbide ring, gravity is applied by using the weighting member to change the inner and outer diameter size of the cemented carbide ring.
It effectively reduces the scrap rate caused by size exceeding the difference, reduces production costs, and can correct the inner and outer diameters of complex shapes.
Smart Images
Figure CN222902384U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of cemented carbide, and particularly relates to a sizing device for cemented carbide. Background Art
[0002] Cemented carbide ring products are widely used in various industries such as motors, electronics, and new energy, and play an irreplaceable role in the shearing fields of some silicon steel sheets, grain-oriented silicon steel sheets, copper foils, and aluminum foils.
[0003] Cemented carbide products are usually produced by powder metallurgy. Due to uneven raw material particle size distribution, loose packing density fluctuations, pressure loss during pressing, etc., the density distribution of the green compact is uneven, resulting in inconsistent shrinkage and deformation during the sintering process of cemented carbide, and ultimately leading to the rejection of alloy products due to out-of-tolerance dimensions. As a special-shaped non-standard cemented carbide product, the deformation of cemented carbide ring products is particularly significant due to the above reasons. If all the sintered and deformed alloy rings are rejected due to out-of-tolerance dimensions, this will result in a high rejection rate of products and increase production costs.
[0004] Therefore, there is an urgent need to provide a sizing die for the inner and outer diameters of cemented carbide rings to correct the sintered and deformed cemented carbide rings. Summary of the Utility Model
[0005] The technical problem to be solved by the utility model is to overcome the above-mentioned deficiencies and defects in the background art, and provide a sizing die for the inner and outer diameters of cemented carbide rings, which can be used to correct the sintered and deformed cemented carbide rings, reduce the rejection rate caused by rejection due to out-of-tolerance dimensions, and reduce the production cost of enterprises.
[0006] To solve the above technical problem, the technical solution proposed by the utility model is as follows:
[0007] A sizing die for the inner and outer diameters of a cemented carbide ring includes a first graphite outer ring, a first graphite inner plug, and a first weighting member for applying gravity to the first graphite inner plug. The outer diameter dimension and the shape of the outer side wall of the first graphite outer ring match the inner diameter dimension and the shape of the inner hole of the cemented carbide ring. The first graphite inner plug can be inserted into the first graphite outer ring, and the first weighting member can be pressed on the surface of the first graphite inner plug. The sizing die with the above structural form can be used to expand the outer diameter of the cemented carbide ring.
[0008] In the above sizing die, preferably, the first graphite outer ring is of a split structure, including a plurality of first split blocks, and a gap of 3-5 mm is provided between adjacent first split blocks. The split structure can ensure that the first graphite outer ring can be placed into the cemented carbide ring and also provides a deformation basis for expanding the cemented carbide ring.
[0009] In the above-mentioned modified die, preferably, the inner cavity of the first graphite outer ring is an inverted conical surface with a taper angle β of 10-30°, and the outer side wall of the first graphite inner plug is an inverted conical surface with a taper angle β of 10-30°. By providing the above-mentioned inverted conical surface, it is convenient for the first graphite inner plug to be inserted into the first graphite outer ring.
[0010] In the above-mentioned modified die, preferably, an anti-sticking and anti-carburizing coating is provided on the outer side wall of the first graphite outer ring. By providing the anti-sticking and anti-carburizing coating, it is possible to prevent the first graphite outer ring from carburizing into the cemented carbide ring and prevent the first graphite outer ring from adhering to the cemented carbide ring. The fine adjustment of the modified size can be achieved through the thickness of the anti-sticking and anti-carburizing coating.
[0011] In the above-mentioned modified die, preferably, it further includes non-stick paper, and the non-stick paper is provided between the first graphite outer ring and the cemented carbide ring, and one or more layers of non-stick paper are provided. Setting the non-stick paper can play a role similar to that of the anti-sticking and anti-carburizing coating, and the fine adjustment of the modified size can also be achieved through the number of layers of the non-stick paper.
[0012] The above-mentioned modified die can be used to expand the inner and outer diameter sizes of the cemented carbide ring. When the outer diameter size of the cemented carbide ring is too small, it needs to be returned to the furnace for burning to expand the outer diameter. Generally, when the outer diameter size of the alloy ring is too small, the inner diameter size must be too small. By expanding the outer diameter size by enlarging the inner hole, it is ensured that there is machining allowance for the outer diameter. The graphite modified die for expanding the inner and outer diameter sizes mainly consists of two parts: the first graphite outer ring and the first graphite inner plug. The size of the first graphite outer ring is equal to the median value of the inner hole size required for the alloy ring (if the inner hole of the alloy ring has steps, grooves, arcs, etc., then the first graphite outer ring is designed and manufactured with corresponding steps, grooves, arcs, etc.). The inner cavity of the first graphite outer ring is designed as a conical surface with an angle of 10-30°. The first graphite outer ring can include four petals, and a gap of 3-5 mm is left between each petal to ensure that the first graphite outer ring can be placed into the inner cavity of the alloy ring. The outer ring of the first graphite inner plug is designed as a conical surface with an angle of 10-30° to cooperate with the inner cavity conical surface of the first graphite outer ring. Designing it as a conical surface with an angle of 10-30° can ensure that the outward expansion force during back burning is about 1.7-5.6 times the weight of the additional weight.
[0013] As a general technical concept, the present invention also provides a modified die for the inner and outer diameters of a cemented carbide ring, including a second graphite outer ring, a second graphite inner ring, and a second weighting member for applying a gravity to the second graphite outer ring. The inner diameter size and inner hole shape of the second graphite inner ring match the outer diameter size and outer side wall shape of the cemented carbide ring. The second graphite outer ring can be sleeved on the second graphite inner ring, and the second weighting member can be pressed on the surface of the second graphite outer ring. The modified die with the above structural form can be used to expand the outer diameter of the cemented carbide ring.
[0014] In the above-mentioned modified die, preferably, the second graphite inner ring is of a split structure, including multiple second split blocks, and a gap of 3-5 mm is provided between adjacent second split blocks. The split structure can ensure that there is no interference between the second split blocks when reaching the re-burning size, providing a deformation basis for the cemented carbide ring.
[0015] In the above-mentioned modified die, preferably, the inner cavity of the second graphite outer ring is a conical surface with a cone angle β of 10-30°, and the outer side wall of the second graphite inner ring is a conical surface with a cone angle β of 10-30°; the side wall thickness k of the second graphite outer ring is 20-40 mm. By setting the above conical surface, it is convenient for the second graphite outer ring to be sleeved on the second graphite inner ring. By making the side wall thickness k of the second graphite outer ring 20-40 mm, the strength of the second graphite outer ring can be ensured.
[0016] In the above-mentioned modified die, preferably, the inner cavity surface of the second graphite inner ring is provided with an anti-sticking and anti-carburizing coating. By setting the anti-sticking and anti-carburizing coating, it can prevent the second graphite inner ring from carburizing into the cemented carbide ring and prevent the second graphite inner ring from adhering to the cemented carbide ring. The fine adjustment of the modified size can be realized through the thickness of the anti-sticking and anti-carburizing coating.
[0017] In the above-mentioned modified die, preferably, it further includes non-stick paper, and the non-stick paper is arranged between the second graphite inner ring and the cemented carbide ring, and there is one or more layers of non-stick paper. Setting the non-stick paper can play a role similar to that of the anti-sticking and anti-carburizing coating, and the fine adjustment of the modified size can also be realized through the number of layers of the non-stick paper.
[0018] The above-mentioned modified die can be used to reduce the inner and outer diameter sizes of the cemented carbide ring. When the inner diameter size of the cemented carbide ring is too large, it needs to be re-burned with the inner diameter reduced. Generally, when the inner diameter size of the cemented carbide ring is too large, the outer diameter size must also be too large. By reducing the outer diameter to reduce the inner diameter size, ensure that there is machining allowance for the inner hole. The graphite modified die for reducing the inner and outer diameter sizes mainly consists of two parts: the second graphite outer ring and the second graphite inner ring. The inner cavity of the second graphite inner ring is equal to the median value of the outer diameter size required for the alloy ring (if the outer circle of the alloy ring has a platform, groove, arc, etc., then the inner cavity of the second graphite inner ring is designed and manufactured with the corresponding platform, groove, arc, etc.). The outer wall surface of the second graphite inner ring is designed as a conical surface with a 10-30° angle. The second graphite inner ring can include four petals, and a gap of 3-5 mm is left between each petal to ensure that there is no interference among the four petals of the second graphite inner ring when reaching the re-burning size. The inner cavity of the second graphite outer ring is designed as a conical surface with a 10-30° angle to cooperate with the conical surface of the outer wall of the second graphite inner ring. The outer diameter of the second graphite outer ring ensures that the wall thickness of the second graphite outer ring is about 20-40 mm to ensure the strength of the second graphite outer ring during the re-burning with additional weight. Designing it as a conical surface with a 10-30° angle can ensure that the inward tightening force during re-burning is about 1.7-5.6 times the additional weight gravity.
[0019] The present utility model also provides a method for correcting the inner and outer diameters of a cemented carbide ring by using the above-mentioned correction die for the inner and outer diameters of the cemented carbide ring, comprising the following steps:
[0020] Step 1: Design and manufacture of the correction die:
[0021] Specifically, it refers to the design and manufacture of the first graphite outer ring and the first graphite inner plug or the second graphite outer ring and the second graphite inner ring. The material for manufacturing the graphite correction die is isostatic high-purity graphite. The cold isostatic high-purity graphite has a dense texture, which can ensure that the designed re-burning size is basically consistent with the actual effect.
[0022] Step 2: Painting the correction die:
[0023] The contact part between the correction die and the re-burned alloy ring must be painted with a coating for sintering to form an anti-adhesion and anti-carburization coating to prevent the product from sticking to the boat and carburizing. To prevent adhesion, non-stick paper can also be used instead of painting. The correction die can make large adjustments to the inner and outer diameter sizes of ring-shaped products. According to the actual effect of size correction, the coating thickness or the number of layers of non-stick paper can be adjusted to achieve fine size adjustment to obtain the best size correction effect.
[0024] Step 3: Cooperatively loading the correction die and the re-burned alloy ring onto the boat. Both the alloy ring and the correction die are placed on the graphite boat that has been painted.
[0025] Step 4: Adding weight to some components of the correction die:
[0026] The first graphite inner plug of the correction die for expanding the inner and outer diameter sizes and the second graphite outer ring of the correction die for reducing the inner and outer diameter sizes will be higher than other components of the correction die. A first weight or a second weight is used to apply gravity to the higher components. The added weight is adjusted according to the wall thickness of the alloy ring. The thicker the wall, the greater the added weight. The expansion force or the tightening force is about 1.7 - 5.6 times the added gravity.
[0027] Step 5: Re-burning:
[0028] The re-burning temperature is 20 - 40°C lower than the normal sintering temperature of the alloy grade to ensure that the alloy performance meets the standard requirements.
[0029] Compared with the prior art, the advantages of the present utility model are as follows:
[0030] The correction die for the inner and outer diameters of the cemented carbide ring of the present utility model cooperates the correction die with the cemented carbide ring product to be corrected, and uses a weight to add weight to some components of the correction die for re-firing, which can change the inner and outer diameters of the cemented carbide ring products by 1-5 mm, and at the same time can reduce the deformation of the alloy ring products. This method can not only correct the ring-shaped alloys with straight holes and straight outer circles for the inner and outer diameters, but also correct the ring-shaped alloys with complex shapes such as steps, grooves, arcs, etc. on the inner and outer diameters, which can greatly reduce the product rejection rate and reduce the production quality cost of alloy products. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0032] Figure 1 Structural schematic diagram of the correction die for the inner and outer diameters of the cemented carbide ring in Embodiment 1 (the first graphite inner plug has been installed in the first graphite outer ring, the inner hole of the cemented carbide ring has a step, and the first weight is not shown).
[0033] Figure 2 For Figure 1 Top view.
[0034] Figure 3 Structural schematic diagram of the correction die for the inner and outer diameters of the cemented carbide ring before use in Embodiment 1 (the first graphite inner plug is not fully installed in the first graphite outer ring, and the inner hole of the cemented carbide ring has a step).
[0035] Figure 4 Structural schematic diagram of the correction die for the inner and outer diameters of the cemented carbide ring after use in Embodiment 1 (the first graphite inner plug has been installed in the first graphite outer ring, the inner hole of the cemented carbide ring has a step, and the first weight is not shown).
[0036] Figure 5 Structural schematic diagram of the correction die for the inner and outer diameters of the cemented carbide ring in Embodiment 2 (the second graphite inner ring has been installed in the second graphite outer ring, the outer side wall of the cemented carbide ring has a step, and the second weight is not shown).
[0037] Figure 6 For Figure 5 Top view.
[0038] Figure 7 Structural schematic diagram of the correction die for the inner and outer diameters of the cemented carbide ring before use in Embodiment 2 (the second graphite inner ring is not fully installed in the second graphite outer ring, and the outer side wall of the cemented carbide ring has a step).
[0039] Figure 8 Schematic structural diagram after using the die for correcting the inner and outer diameters of the cemented carbide ring in Example 2 (the first graphite inner plug has been disposed in the first graphite outer ring, the outer side wall of the cemented carbide ring has a platform, and the second weight member is not shown).
[0040] Legend
[0041] 1. First graphite outer ring; 2. First graphite inner plug; 3. First weight member; 4. Second graphite outer ring; 5. Second graphite inner ring; 6. Second weight member; 7. Graphite boat; 100. Cemented carbide ring. Detailed implementation manners
[0042] To facilitate the understanding of the present invention, the present invention will be described more comprehensively and in detail below in conjunction with the accompanying drawings of the specification and preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.
[0043] It should be particularly noted that when an element is described as "fixed to, fixedly connected to, connected to, or communicated with" another element, it can be directly fixed, fixedly connected, connected, or communicated to the other element, or indirectly fixed, fixedly connected, connected, or communicated to the other element through other intermediate connecting members.
[0044] Unless otherwise defined, all professional terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention.
[0045] Unless otherwise specifically stated, various raw materials, reagents, instruments, and equipment used in the present invention can be obtained through market purchase or can be prepared by existing methods.
[0046] Example 1:
[0047] As Figures 1-4 shown, the die for correcting the inner and outer diameters of the cemented carbide ring in this embodiment includes a first graphite outer ring 1, a first graphite inner plug 2, and a first weight member 3 for applying gravity to the first graphite inner plug 2. The outer diameter dimension and the shape of the outer side wall of the first graphite outer ring 1 match the inner diameter dimension and the shape of the inner hole of the cemented carbide ring 100. The first graphite inner plug 2 can be inserted into the first graphite outer ring 1, and the first weight member 3 can be pressed on the surface of the first graphite inner plug 2.
[0048] In this embodiment, the first graphite outer ring 1 is of a split structure and includes four first split blocks, and a gap of 3 - 5 mm (any value within the above range is acceptable) is provided between adjacent first split blocks. In other embodiments, first split blocks with other numbers of petals can also be provided, such as three petals, five petals, etc.
[0049] In this embodiment, the inner cavity of the first graphite outer ring 1 is an inverted conical surface with a cone angle β of 10 - 30° (any value within the above range is acceptable), and the outer side wall of the first graphite inner plug 2 is an inverted conical surface with a cone angle β of 10 - 30° (any value within the above range is acceptable).
[0050] In this embodiment, an anti - sticking and anti - carburizing coating is provided on the outer side wall of the first graphite outer ring 1. Alternatively, in this embodiment, non - stick paper is used instead of the anti - sticking and anti - carburizing coating, and the non - stick paper is arranged between the first graphite outer ring 1 and the cemented carbide ring 100, and there is one or more layers of non - stick paper.
[0051] Embodiment 2:
[0052] As Figures 5-8 shown, the correction die for the inner and outer diameters of the cemented carbide ring in this embodiment includes a second graphite outer ring 4, a second graphite inner ring 5, and a second weighting member 6 for applying gravity to the second graphite outer ring 4. The inner diameter dimension and inner hole shape of the second graphite inner ring 5 match the outer diameter dimension and outer side wall shape of the cemented carbide ring 100. The second graphite outer ring 4 can be sleeved on the second graphite inner ring 5, and the second weighting member 6 can be pressed on the surface of the second graphite outer ring 4.
[0053] In this embodiment, the second graphite inner ring 5 is of a split structure, including multiple second split blocks, and there is a gap of 3 - 5 mm (any value within the above range is acceptable) between adjacent second split blocks. In other embodiments, second split blocks with other numbers of petals can also be set, such as three - petal, five - petal, etc.
[0054] In this embodiment, the inner cavity of the second graphite outer ring 4 is a conical surface with a cone angle β of 10 - 30° (any value within the above range is acceptable), and the outer side wall of the second graphite inner ring 5 is a conical surface with a cone angle β of 10 - 30° (any value within the above range is acceptable); the side wall thickness k of the second graphite outer ring 4 is 20 - 40 mm (any value within the above range is acceptable).
[0055] In this embodiment, an anti - sticking and anti - carburizing coating is provided on the inner cavity surface of the second graphite inner ring 5. Alternatively, in this embodiment, non - stick paper is used instead of the anti - sticking and anti - carburizing coating, and the non - stick paper is arranged between the second graphite inner ring 5 and the cemented carbide ring 100, and there is one or more layers of non - stick paper.
[0056] Application Example:
[0057] A correction method for correcting the dimensions of complex cemented carbide ring - like products using the correction die in the above - mentioned Embodiment 1 or Embodiment 2 includes the following steps:
[0058] Step 1: Design and manufacture of the correction die:
[0059] Specifically, it refers to the design and manufacture of the first graphite outer ring 1 and the first graphite inner plug 2, or the design and manufacture of the second graphite outer ring 4 and the second graphite inner ring 5. The material used for manufacturing the graphite correction mold is isostatic pressing high-purity graphite. The cold isostatic pressing high-purity graphite has a dense texture, which can ensure that the designed re-burning size is basically consistent with the actual effect.
[0060] Step 2: Coating the correction mold:
[0061] The contact part between the correction mold and the re-burning alloy ring must be coated with a sintering coating to form an anti-sticking and anti-carburizing coating to prevent the product from sticking to the boat and carburizing. To prevent adhesion, non-stick paper can also be used instead of coating. The correction mold can make large adjustments to the inner and outer diameter sizes of ring-shaped products. According to the actual effect of size correction, the coating thickness or the number of layers of non-stick paper can be adjusted to achieve fine size adjustment to obtain the best size correction effect.
[0062] Step 3: Assembling the correction mold and the re-burning alloy ring onto the boat. Both the alloy ring and the correction mold are placed on the graphite boat 7 coated with the coating.
[0063] Step 4: Adding weight to some components of the correction mold:
[0064] The first graphite inner plug 2 of the correction mold for expanding the inner and outer diameter sizes and the second graphite outer ring 4 of the correction mold for reducing the inner and outer diameter sizes will be higher than other components of the correction mold. On the higher components, use the first weight 3 (as shown in Figure 3 Figure) or the second weight 6 (as shown in Figure 7 Figure) to apply gravity. The added weight is adjusted according to the wall thickness of the alloy ring. The thicker the wall, the greater the added weight. The expansion force or tightening force is about 1.7 - 5.6 times the added gravity.
[0065] Step 5: Re-burning:
[0066] The re-burning temperature is 20 - 40°C lower than the normal sintering temperature of the alloy grade to ensure that the alloy performance meets the standard requirements. The schematic structural diagrams after correction are as shown in Figure 4 、 Figure 8 Figure.
[0067] More specifically, taking a specific cemented carbide ring 100 as an example, the method for correcting the expansion of the inner and outer diameters may include the following steps:
[0068] Size standard for ring-shaped products: φ310(+2~+4)*φ180(-1~-3)*10(+0.8~+1.3) (no steps on the inner hole and outer circle); the actual size after sintering is: φ311*φ176*11.0, with both the inner and outer diameters being smaller and not meeting the standard. It is necessary to expand the inner and outer diameters for re-burning, and it is more appropriate to expand the inner and outer diameters by 2mm.
[0069] The outer diameter of the first graphite outer ring 1 of the die for correcting the inner and outer diameters is designed to be φ178 ± 0.1 mm, which is equal to the median value of the inner diameter dimension required for the alloy ring. The inner ring of the first graphite outer ring 1 is designed with a conical surface of 15°. The first graphite outer ring 1 is divided into four segments, and there is a 4-mm gap between each segment (even if the arc length of each segment is less than 1 / 4 of the circumference of the first graphite outer ring 1, and the first graphite outer ring 1 is a discontinuous structure) to ensure that the first graphite outer ring 1 can be placed into the alloy ring, and the subsequent insertion of the first graphite inner plug 2 plays an expanding role, ensuring that the first graphite outer ring 1 can be placed into the alloy inner ring. The outer ring of the first graphite inner plug 2 is designed with a conical surface of 15° to cooperate with the inner conical surface of the first graphite outer ring 1.
[0070] Due to the relatively thick wall of the product, 50 kg of weight is added to the first graphite inner plug 2 during the re-firing process.
[0071] After adding weight and re-firing, the actually measured inner and outer diameter sizes are: φ177.8 and φ312.6, and the product size is qualified. There are slight differences between the designed size and the actual size, mainly due to the inconsistent thermal expansion coefficients of the graphite material and the alloy. This slight difference can be fine-tuned by adjusting the coating thickness to achieve an ideal effect.
[0072] More specifically, taking a specific cemented carbide ring 100 as an example, the method for correcting the reduction of the inner and outer diameters may include the following steps:
[0073] The size standard for ring-shaped products: φ250(+2~+4)*φ221(±1)*19(+1~+2). After sintering, the actual size is: φ255*φ223*20.6. The inner and outer diameters are too large and do not meet the standards, and it is necessary to perform re-firing for reducing the inner and outer diameters. It is more appropriate to reduce the inner and outer diameters by 2 mm.
[0074] The inner diameter of the second graphite inner ring 5 of the die for reducing the inner and outer diameters is designed to be φ253.0 ± 0.1 mm, which is equal to the median value of the outer diameter dimension required for the alloy ring. The outer ring of the second graphite inner ring 5 is designed with a conical surface of 15°. The second graphite inner ring 5 is divided into four segments, and there is a 4-mm gap between each segment (even if the arc length of each segment is less than 1 / 4 of the circumference of the second graphite inner ring 5, and the second graphite inner ring 5 is a discontinuous structure). The inner ring of the second graphite outer ring 4 is designed with a conical surface of 15° to cooperate with the outer conical surface of the second graphite inner ring 5.
[0075] Due to the relatively thin wall of the product, weight is added to the second graphite outer ring 4 during the re-firing process.
[0076] After adding weight and re-firing, the actually measured inner and outer diameter sizes are: φ220.6 and φ252.8, and the inner and outer diameter sizes of the product are qualified.
[0077] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A die for correcting the inner and outer diameters of a cemented carbide ring, characterized in that: The invention comprises a first graphite outer ring (1), a first graphite inner plug (2) and a first weighting member (3) for applying gravity to the first graphite inner plug (2); the outer diameter and outer wall shape of the first graphite outer ring (1) match the inner diameter and inner hole shape of the cemented carbide ring (100); the first graphite inner plug (2) can be inserted into the first graphite outer ring (1); and the first weighting member (3) can be pressed onto the surface of the first graphite inner plug (2).
2. The correction mold according to claim 1, characterized in that: The first graphite outer ring (1) is a split structure, comprising a plurality of first split blocks, and a gap of 3-5 mm is provided between adjacent first split blocks.
3. The correction mold according to claim 1, characterized in that: The inner cavity of the first graphite outer ring (1) is an inverted cone surface with a cone angle β of 10-30°, and the outer side wall of the first graphite inner plug (2) is an inverted cone surface with a cone angle β of 10-30°.
4. The correction die according to any one of claims 1 to 3, characterized in that: The outer side wall of the first graphite outer ring (1) is provided with an anti-sticking and anti-carburization coating.
5. The correction mold according to any one of claims 1 to 3, characterized in that: It also includes non-stick paper, which is arranged between the first graphite outer ring (1) and the cemented carbide ring (100), and the non-stick paper is provided with one or more layers.
6. A die for correcting the inner and outer diameters of a cemented carbide ring, characterized in that: The invention comprises a second graphite outer ring (4), a second graphite inner ring (5) and a second weight member (6) for applying gravity to the second graphite outer ring (4); the inner diameter and inner hole shape of the second graphite inner ring (5) match the outer diameter and outer wall shape of the cemented carbide ring (100); the second graphite outer ring (4) can be sleeved on the second graphite inner ring (5); and the second weight member (6) can be pressed onto the surface of the second graphite outer ring (4).
7. The correction mold according to claim 6, characterized in that: The second graphite inner ring (5) is a split structure, comprising a plurality of second split blocks, and a gap of 3-5 mm is provided between adjacent second split blocks.
8. The correction mold according to claim 6, characterized in that: The inner cavity of the second graphite outer ring (4) is a conical surface with a cone angle β of 10-30°, and the outer wall of the second graphite inner ring (5) is a conical surface with a cone angle β of 10-30°; the side wall thickness k of the second graphite outer ring (4) is 20-40 mm.
9. The correction die according to any one of claims 6 to 8, characterized in that: The inner cavity surface of the second graphite inner ring (5) is provided with an anti-sticking and anti-carburization coating.
10. The correction mold according to any one of claims 6 to 8, characterized in that: It also includes non-stick paper, which is arranged between the second graphite inner ring (5) and the cemented carbide ring (100), and the non-stick paper is provided with one or more layers.