A device and method for controlling sintering deformation of lath-type cemented carbide

Abstract

The present invention belongs to the technical field of cemented carbide, and specifically relates to a device and method for controlling the sintering deformation of lath-type cemented carbide, wherein a lath-type cemented carbide compact is placed on a swivel, and the swivel is placed on the notches of at least two parallel bases, and according to the historical deformation of the bottom and side surfaces of the same specification of cemented carbide compacts, the swivel is rotated along the notch, and the angle at which the swivel is placed on the base is adjusted to obtain a plurality of cemented carbide compacts with different placement angles, and the cemented carbide compacts are sintered, and the deformation of the lath-type cemented carbide is measured after being taken out of the furnace, and the cemented carbide compacts of the specification are batch sintered using the angle of the group with the smallest deformation. The present invention can reduce the deformation amount of lath-type cemented carbide sintering deformation by adjusting the sintering angle, and improve the qualified rate of lath-type cemented carbide products.

Description

Technical Field

[0001] The invention belongs to the technical field of cemented carbide, and in particular relates to a device and a method for controlling the sintering deformation of lath-type cemented carbide. Background Art

[0002] Lath-type cemented carbide is a common type of cemented carbide, which can be used in various processing technologies such as cutting, drilling, milling, grinding, and stamping, and is widely used in the fields of mechanical manufacturing and metal processing. Sintering, as the final key link in cemented carbide production, aims to transform powder compacts into dense alloys with specific organizational structures and properties. The cemented carbide powder mixture with different components is pressed into a compact, and then sintered to alloy the compact, so as to control its organizational structure. Affected by the sintering process and changes in the internal structure of the material, deformation will occur during the sintering process of cemented carbide, resulting in a decrease in material performance, affecting the accuracy and life of the products processed with it, reducing the use effect of cemented carbide tools, and causing harm to the production and processing process. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the main purpose of the present invention is to provide a device and method for controlling the sintering deformation of lath-type cemented carbide.

[0004] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0005] A device for controlling sintering deformation of lath-type cemented carbide comprises a base and a rotating seat;

[0006] The base is provided with a slot for placing the swivel seat;

[0007] The swivel seat is placed on the slots of at least two parallel bases and can rotate along the slots as needed. The swivel seat is a polygonal columnar structure with a notch along its axial direction. The two surfaces of the notch are perpendicular to each other and serve as contact surfaces with the bottom and side surfaces of the cemented carbide compact.

[0008] As a preferred embodiment of the device for controlling sintering deformation of lath-type cemented carbide described in the present invention, a spray layer is attached to the contact surface, which can withstand the high sintering temperature and isolate the cemented carbide compact, so that the cemented carbide compact will not stick to the boat, carburize and decarburize during the sintering process.

[0009] As a preferred solution of the device for controlling sintering deformation of lath-type cemented carbide described in the present invention, the device also includes a cover body, which is used to cover the outside of the base and the rotating seat, and can isolate the sintering atmosphere of other products in the furnace, so that the sintering atmosphere and temperature in the cover body are more uniform.

[0010] As a preferred solution of the device for controlling sintering deformation of lath-type cemented carbide described in the present invention, a dewaxing port is arranged on the side wall of the cover body, and wax vapor can flow out from the dewaxing port during dewaxing.

[0011] As a preferred solution of the device for controlling sintering deformation of lath-type cemented carbide described in the present invention, the base, the rotating seat and the cover are all made of graphite.

[0012] To solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solution:

[0013] A method for controlling the sintering deformation of lath-type cemented carbide, using the above-mentioned device for controlling the sintering deformation of lath-type cemented carbide, comprises the following steps:

[0014] S1. placing a lath-type cemented carbide compact on a rotating seat;

[0015] S2, placing the swivel seat on the notches of at least two parallel bases;

[0016] S3, according to the historical deformation of the bottom and side surfaces of the same specification of cemented carbide compacts, the swivel seat is rotated along the notch, and the angle at which the swivel seat is placed on the base is adjusted to obtain a plurality of cemented carbide compacts with different placement angles;

[0017] S4. The cemented carbide compacts are sintered. After being taken out of the furnace, the deformation of the lath-type cemented carbide is measured. The angle of the group with the smallest deformation is used to batch sinter the cemented carbide compacts of this specification.

[0018] As a preferred embodiment of the method for controlling the sintering deformation of lath-type cemented carbide described in the present invention, wherein: in the step S3, when the deformation of the bottom surface of the cemented carbide compact is greater than the deformation of the side surface, the angle A of the counterclockwise rotation of the swivel satisfies 0°≤A<45°; when the deformation of the bottom surface of the cemented carbide compact is less than the deformation of the side surface, the angle A of the counterclockwise rotation of the swivel satisfies 45°<A≤90°; when the deformation of the bottom surface of the cemented carbide compact is equal to the deformation of the side surface, the angle A of the counterclockwise rotation of the swivel is 45°.

[0019] As a preferred solution of the method for controlling sintering deformation of lath-type cemented carbide described in the present invention, wherein: in the step S4, before the cemented carbide compact is sintered, the cover body is disposed outside the base and the rotating seat.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention proposes a device and method for controlling the sintering deformation of lath-type cemented carbide, wherein a lath-type cemented carbide compact is placed on a rotating seat, and the rotating seat is placed on the notches of at least two parallel bases. According to the historical deformation of the bottom and side surfaces of cemented carbide compacts of the same specification, the rotating seat is rotated along the notch, and the angle at which the rotating seat is placed on the base is adjusted to obtain a plurality of cemented carbide compacts with different placement angles. The cemented carbide compacts are sintered, and the deformation of the lath-type cemented carbide is measured after being taken out of the furnace. The angle of the group with the smallest deformation is used to batch sinter the cemented carbide compacts of the specification. The present invention can reduce the deformation of lath-type cemented carbide during sintering by adjusting the sintering angle, and improve the qualified rate of lath-type cemented carbide products. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure of the transposition device of the present invention.

[0024] Figure 2 It is a schematic structural diagram of the base of the device of the present invention.

[0025] Figure 3 It is a schematic diagram of the structure of placing a turntable on the base of the device of the present invention.

[0026] Figure 4 It is a schematic structural diagram of the cover body of the device of the present invention.

[0027] Figure 5 It is a schematic diagram of the state of the process in which the cover body of the device of the present invention is arranged outside the base and the rotating seat.

[0028] Figure 6 The figure is a force diagram of the lath-type cemented carbide compact of the present invention placed on a swivel.

[0029] In the figure: 1-rotatable seat, 1-1-contact surface, 2-base, 3-cover body, 4-hard alloy compact.

[0030] The realization of the effects, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention provides a device and method for controlling the sintering deformation of lath-type cemented carbide. Figure 1-5 As shown, the device comprises a base 2 and a rotating base 1;

[0033] The base 2 is provided with a slot for placing the swivel base 1;

[0034] The swivel seat 1 is placed on the slots of at least two parallel bases 2 and can rotate along the slots as needed. The swivel seat 1 is a polygonal columnar structure with a notch along its axial direction. The two surfaces of the notch are perpendicular to each other and serve as contact surfaces 1-1 that contact the bottom and side surfaces of the cemented carbide compact 4.

[0035] Preferably, the contact surface 1-1 is attached with a spray layer, which can withstand the high sintering temperature and isolate the cemented carbide compact 4, so that the cemented carbide compact 4 will not stick to the boat, carburize and decarburize during the sintering process.

[0036] Preferably, the device further comprises a cover body 3, which is used to cover the outside of the base 2 and the rotating base 1, and can isolate the sintering atmosphere of other products in the furnace, so that the sintering atmosphere and temperature in the cover body 3 are more uniform.

[0037] Preferably, the side wall of the cover body 3 is provided with a dewaxing port, and wax vapor can flow out from the dewaxing port during dewaxing.

[0038] Preferably, the base 2, the rotating base 1 and the cover 3 are all made of graphite.

[0039] A method for controlling sintering deformation of lath-type cemented carbide according to an embodiment of the present invention uses the above-mentioned device for controlling sintering deformation of lath-type cemented carbide, and comprises the following steps:

[0040] S1, placing the lath-type cemented carbide compact 4 on the swivel seat 1;

[0041] S2, placing the swivel base 1 on the notches of at least two parallel bases 2;

[0042] S3, according to the historical deformation of the bottom and side surfaces of the cemented carbide compact 4 of the same specification, the swivel seat 1 is rotated along the notch, and the angle at which the swivel seat 1 is placed on the base 2 is adjusted to obtain a plurality of cemented carbide compacts 4 with different placement angles;

[0043] S4, the cemented carbide green compacts 4 are sintered, and after being taken out of the furnace, the deformation of the lath-type cemented carbide is measured, and the angle of the group with the smallest deformation is used to batch sinter the cemented carbide green compacts 4 of this specification.

[0044] The force diagram of the lath-type cemented carbide compact placed on the swivel is as follows Figure 6 As shown, the cemented carbide blank 4 is affected by its own gravity G, which can be decomposed into the pressure Fbottom on the bottom surface and the pressure Fside on the side surface. The effects of Fbottom and Fside on the bottom surface and the side surface can reduce the deformation of the lath-type cemented carbide blank 4. From the force analysis, the relationship can be obtained: Fbottom=cosA, Fside=sinA. Then, when the deformation of the bottom surface of the cemented carbide blank 4 is greater than the deformation of the side surface, the counterclockwise rotation angle A of the swivel 1 satisfies 0°≤A<45°; when the deformation of the bottom surface of the cemented carbide blank 4 is less than the deformation of the side surface, the counterclockwise rotation angle A of the swivel 1 satisfies 45°<A≤90°; when the deformation of the bottom surface of the cemented carbide blank 4 is equal to the deformation of the side surface, the counterclockwise rotation angle A of the swivel 1 is 45°.

[0045] Preferably, in the step S4 , before the cemented carbide compact 4 is sintered, the cover body 3 is disposed outside the base 2 and the rotary base 1 .

[0046] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0047] The following embodiments all adopt the above-mentioned device for controlling the sintering deformation of strip-type cemented carbide.

[0048] Example 1

[0049] A method for controlling sintering deformation of lath-type cemented carbide comprises the following steps:

[0050] S1. Place a lath-type cemented carbide compact with a bottom length of 40 mm and a width of 20 mm on a rotating seat;

[0051] S2, placing the swivel seat on the notches of two parallel bases;

[0052] S3. According to the historical deformation of the bottom and side surfaces of the same specification of cemented carbide compacts (the deformation of the bottom and side surfaces were measured with a plug gauge, and the deformation of the bottom was 0.2 mm and the deformation of the side surfaces was 0.1 mm), when the deformation of the bottom surface of the cemented carbide compact was greater than the deformation of the side surface, the swivel was rotated counterclockwise at an angle A satisfying 0°≤A<45°, and the swivel was rotated along the notch, and the angle at which the swivel was placed on the base was adjusted every 5° to obtain a plurality of cemented carbide compacts with different placement angles;

[0053] S4. The cover is placed outside the base and the rotating seat, and the cemented carbide compact is sintered. After it comes out of the furnace, the deformation of the lath-type cemented carbide is measured. The deformation is the smallest when the rotating seat rotates counterclockwise at an angle A of 40°. The measurement results are: the deformation of the bottom surface is 0.1mm, and the deformation of the side surface is 0.08mm. Using the angle with the smallest deformation, batch sintering of cemented carbide compacts of this specification, compared with the flat boat sintering, the deformation is effectively improved.

[0054] Example 2

[0055] A method for controlling sintering deformation of lath-type cemented carbide comprises the following steps:

[0056] S1. Place a lath-type cemented carbide compact with a bottom length of 30 mm and a width of 15 mm on a rotating seat;

[0057] S2, placing the swivel seat on the notches of two parallel bases;

[0058] S3. According to the historical deformation of the bottom and side surfaces of the same specification of cemented carbide compacts (the deformation of the bottom and side surfaces were measured with a plug gauge, and the deformation of the bottom was 0.15 mm and the deformation of the side surfaces was 0.3 mm), when the deformation of the bottom surface of the cemented carbide compact was greater than the deformation of the side surfaces, the swivel was rotated counterclockwise at an angle A satisfying 45°<A≤90°, and the swivel was rotated along the notch, and the angle at which the swivel was placed on the base was adjusted every 5° to obtain a plurality of cemented carbide compacts with different placement angles;

[0059] S4. The cover is placed outside the base and the rotating seat, and the cemented carbide compact is sintered. After it comes out of the furnace, the deformation of the lath-type cemented carbide is measured. The deformation is the smallest when the rotating seat rotates counterclockwise at an angle A of 65°. The measurement results are: the deformation of the bottom surface is 0.1mm, and the deformation of the side surface is 0.12mm. Using the angle with the smallest deformation, batch sintering of cemented carbide compacts of this specification, compared with the flat boat sintering, the deformation is effectively improved.

[0060] Example 3

[0061] A method for controlling sintering deformation of lath-type cemented carbide comprises the following steps:

[0062] S1. Place a lath-type cemented carbide compact with a bottom length of 40 mm and a width of 30 mm on a rotating seat;

[0063] S2, placing the swivel seat on the notches of two parallel bases;

[0064] S3. According to the historical deformation of the bottom and side surfaces of the same specification of cemented carbide compacts (the deformation of the bottom and side surfaces were measured with a plug gauge, and the deformation of the bottom and side surfaces was measured to be 0.3 mm and 0.3 mm respectively), when the deformation of the bottom surface of the cemented carbide compact is greater than the deformation of the side surface, the swivel is rotated counterclockwise by an angle A of 45°, and the swivel is rotated along the notch to adjust the angle at which the swivel is placed on the base;

[0065] S4. The cover is placed outside the base and the rotating seat, and the cemented carbide compact is sintered. After it comes out of the furnace, the deformation of the lath-type cemented carbide is measured. The deformation amount when the rotating seat rotates counterclockwise at an angle A of 45° is: the bottom deformation is 0.11mm, and the side deformation is 0.10mm. Using this angle, batch sintering of cemented carbide compacts of this specification has effectively improved the deformation amount compared with flat boat sintering.

[0066] Comparative Example 1

[0067] The difference from Example 1 is that a flat boat is used instead of the device for controlling the sintering deformation of the lath-type cemented carbide.

[0068] During the sintering process, affected by factors such as the sintering process and its own density distribution, the deformation of the lath-type cemented carbide did not improve, and the bottom and side deformations could not be reduced.

[0069] Comparative Example 2

[0070] The difference from the first embodiment is that the counterclockwise rotation angle A of the swivel base satisfies 135°≤A<315°.

[0071] During the sintering process, the lath-type cemented carbide compact slipped off the swivel, and the compact came into contact with the graphite boat, causing carburization, and was scrapped as a defective product.

[0072] Comparative Example 3

[0073] The difference from the second embodiment is that the counterclockwise rotation angle A of the swivel base satisfies 90°≤A<135°.

[0074] The deformation of the lath-type cemented carbide after it came out of the furnace was measured as follows: the side deformation decreased by 0.01~0.05mm, but the bottom deformation increased by 0.01~0.04mm. The plane deformation and side deformation could not be reduced at the same time.

[0075] It can be seen from the above embodiments and comparative examples that a lath-type cemented carbide compact is placed on a swivel, and the swivel is placed on the notches of at least two parallel bases. According to the historical deformation of the bottom and side surfaces of the same specification of cemented carbide compacts, the swivel is rotated along the notch, and the angle at which the swivel is placed on the base is adjusted to obtain a plurality of cemented carbide compacts with different placement angles. The cemented carbide compacts are sintered, and the deformation of the lath-type cemented carbide is measured after being taken out of the furnace. The angle of the group with the smallest deformation is used to batch sinter the cemented carbide compacts of the specification. The present invention can reduce the deformation of lath-type cemented carbide during sintering by adjusting the sintering angle, and improve the qualified rate of lath-type cemented carbide products.

[0076] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for controlling sintering deformation of lath-type cemented carbide, characterized in that: The device used for controlling the sintering deformation of the strip-type cemented carbide comprises a base and a rotating base; the base is provided with a notch for placing the rotating base; the rotating base is placed on the notches of at least two parallel bases and can rotate along the notches as needed, the rotating base is in a polygonal columnar structure as a whole, a notch is provided along its axial direction, and two surfaces of the notch are perpendicular to each other, serving as contact surfaces with the bottom and side surfaces of the cemented carbide compact; The steps include: S1. placing a lath-type cemented carbide compact on a rotating seat; S2, placing the swivel seat on the notches of at least two parallel bases; S3, according to the historical deformation of the bottom and side surfaces of the same specification of cemented carbide compacts, the swivel seat is rotated along the notch, and the angle at which the swivel seat is placed on the base is adjusted to obtain a plurality of cemented carbide compacts with different placement angles; S4. The cemented carbide compacts are sintered. After being taken out of the furnace, the deformation of the lath-type cemented carbide is measured. The angle of the group with the smallest deformation is used to batch sinter the cemented carbide compacts of this specification.

2. The method for controlling sintering deformation of lath-type cemented carbide according to claim 1, characterized in that: In the step S3, when the deformation of the bottom surface of the cemented carbide compact is greater than the deformation of the side surface, the counterclockwise rotation angle A of the swivel satisfies 0°≤A<45°; when the deformation of the bottom surface of the cemented carbide compact is less than the deformation of the side surface, the counterclockwise rotation angle A of the swivel satisfies 45°<A≤90°; when the deformation of the bottom surface of the cemented carbide compact is equal to the deformation of the side surface, the counterclockwise rotation angle A of the swivel is 45°.

3. The method for controlling sintering deformation of lath-type cemented carbide according to claim 1, characterized in that: In the step S4, before the cemented carbide compact is sintered, the cover body is disposed outside the base and the rotating seat.

4. The method for controlling sintering deformation of lath-type cemented carbide according to claim 1, characterized in that: A spray coating is attached to the contact surface.

5. The method for controlling sintering deformation of lath-type cemented carbide according to claim 1, characterized in that: The device also includes a cover body, which is used for covering the outside of the base and the rotating base.

6. The method for controlling sintering deformation of lath-type cemented carbide according to claim 5, characterized in that: The side wall of the cover body is provided with a dewaxing port, and wax vapor can flow out from the dewaxing port during dewaxing.

7. The method for controlling sintering deformation of lath-type cemented carbide according to claim 5, characterized in that: The base, the rotating base and the cover are all made of graphite.

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