TW201927446A - Gradient hard alloy drilling mold - Google Patents

Abstract

The invention relates to a gradient hard alloy drilling mold, including a base fabricated from hard alloy. A mold and a discharge chute are placed on the base. The discharge chute includes chutes and tenons which is connecting the middle of the chutes. The two ends of each chute is respectively connected with the opposite side walls of the front and rear of the base. And one end of the tenons are connected to the right side wall of the base. It is characterized in that the top surface of the mold is flat with the top surface of the base. The mold sinks from the top surface of the base into the interior of the base. The left side of the mold is flush with the left side wall of the base. The right side of the mold is between 1 to 5 mm from the discharge chute. The hardness of the mold is higher than the base. The mold and the base are combined by high temperature sintering.

Description

Gradient Carbide Drilling Die

The invention relates to the technical field of cemented carbide, in particular to a gradient cemented carbide drill tail die.

Cemented carbide is a material with high hardness, high strength, and high wear resistance, and has been widely used in many fields of modern industry. Cemented carbide products are usually powder metallurgy products that are sintered in a vacuum furnace or a hydrogen sintering furnace with the micron powder of carbide of high hardness refractory metal as the main component. Cemented carbide products are widely used in petroleum drilling teeth, coal cutter teeth, cold milling machine teeth, stamping dies, rolls and other fields.

Chinese patent CN103817150 discloses a gradient structure type hard alloy roll ring including a roll ring outer layer and a roll ring core portion. The roll ring outer layer is arranged on the outer surface of the roll ring core portion, and there is mutual fusion between the outer layer of the roll ring and the core portion of the roll ring. Layer, forming a composition gradient between the outer layer of the roll ring and the core of the roll ring. The composition of the outer layer of the roll ring and the core of the roll ring is different. The ball milling mixture is layered and laminated powder, cold rolled into a roll ring blank, and sintered to obtain the final product. The disadvantage is that when a composite cemented carbide product is obtained by using a composition gradient, the composition diffusion due to the concentration gradient will occur during the sintering process, and the slight difference in the process will cause the dispersion to be very different, making it difficult to control the final product performance consistency.

Chinese patent CN201611158327.7 is a solution to the above problem, but after a period of use, it is found that the tail drilling die is in use, because the upper and lower layers are different and compacted together, resulting in stress concentration during the use The joint surface is subject to pure shear stress, and the two sides of the joint surface are prone to cracking, which reduces the service life of the mold. In response to this situation, the applicant has invented a new gradient cemented carbide tailing die preparation structure after extensive research.

The present invention improves the problems existing in the prior art, that is, the technical problem to be solved by the present invention is to provide a graded cemented carbide tail drill with uniform force and long service life.

In order to solve the above technical problems, the technical solution of the present invention is: a graded cemented carbide drill tail die, comprising a base made of hard alloy, the base is provided with a mold embryo, and the base is also provided with a discharge slot The discharge groove includes a vertical groove and a horizontal groove connecting the middle of the vertical groove. The two ends of the vertical groove are communicated with the two opposite side walls of the base, and one end of the horizontal groove is communicated with the right wall of the base. Sinking from the top surface of the base to the inside of the base, the left side of the mold is flush with the left wall of the base, the right side of the mold is not connected to the discharge slot, and the hardness of the mold is higher than that of the base Hardness, the mold base and the base are combined through high temperature sintering.

Further preferably, the top surface of the mold blank is flush with the top surface of the base.

Further preferably, a distance between a right side surface of the mold blank and a discharge groove is 1 to 5 mm.

Further preferably, the top surface of the mold blank is not flush with the top surface of the base.

Further preferably, the cemented carbide of the base is composed of WC powder, Co powder, and Cr3C2 powder, wherein the particle diameter d of the WC powder is 6-16 μm at the bottom.

Further preferably, the cemented carbide of the mold blank is composed of WC powder, Co powder, and VC powder, and the particle diameter d of the WC powder is 0.6-6 μm.

Further preferably, the discharge groove is a horizontal groove.

Further preferably, the contour of the line of intersection of the mold embryo and the left side of the base is polygonal, or consists of multiple segments of arcs, or consists of multiple segments of curves, or consists of straight lines and arcs, or consists of straight lines and curves, or arcs and curves Composition, or straight lines, curves and arcs.

Further preferably, the contour of the line of intersection of the mold base and the top surface of the base is polygonal, or consists of multiple segments of arcs, or consists of multiple segments of curves, or consists of straight lines and arcs, or consists of straight lines and curves, or consists of arcs and curves Composition, or straight lines, curves and arcs. Further preferably, a longitudinal section profile size of the mold blank is always equal from left to right.

Further preferably, the longitudinal section profile size of the mold blank is not always equal from left to right.

Compared with the prior art, the present invention has the following beneficial effects: By setting a relatively hard carbide die on the lower hardness base, the present invention no longer bears the shear stress on the horizontal plane, and the mold is used Life expectancy has increased significantly.

The present invention will be described in further detail below with reference to the drawings and specific embodiments.

Embodiment 1: As shown in FIG. 1 to FIG. 3, a graded cemented carbide drill tail mold includes a base 1 made of hard alloy. The base is provided with a mold embryo 2, and the base 1 is further provided with a base. Discharging trough 3, which comprises a vertical trough 31 and a horizontal trough 32 connecting the middle of the vertical trough 31. The two ends of the vertical trough 31 communicate with the two opposite side walls of the base 1 respectively, and one end of the lateral trough 32 It communicates with the right side wall of the base 1. The mold base 2 sinks into the interior of the base 1 from the top surface of the base 1. The left side of the mold base 2 is flush with the left wall of the base 1. The right side of the mold base 2 is The vertical grooves 31 of the discharge tank 3 are not connected. The hardness of the mold base 2 is higher than that of the base 1. The mold base 2 and the base 1 are combined by high temperature sintering.

The top surface of the mold base 2 is flush with the top surface of the base 1.

The distance between the right side of the mold blank 2 and the vertical groove 31 of the discharge groove 3 is 5 mm.

The cemented carbide of the base 1 is composed of WC powder, Co powder and Cr3C2 powder, and the particle diameter d of the WC powder is 6 μm at the bottom.

The cemented carbide of the mold blank 2 is composed of WC powder, Co powder, and VC powder, and the particle diameter d of the WC powder is 0.6 μm.

The profile of the line of intersection of the mold base 2 and the left side of the base 1 is semicircular.

The size of the mold blank 2 along the B-B longitudinal section profile in FIG. 1 is always equal from left to right.

The gradient cemented carbide tail mold is produced according to the following steps:

(1) Preparation of base 1 mixture: Weigh WC powder, Co powder and Cr3C2 powder (or use VC powder) for raw material batching. The particle diameter d of the WC powder is 6-16μm. The raw materials after mixing are wetted. Ball milling, after the wet ball milling, the wet ball milled mixture is subjected to the first wet sieving, the first screened mixture is vacuum dried, and the vacuum dried mixture is subjected to the second time Sieved, then dried in wax to obtain the cemented carbide mixture of the base;

(2) Preparation of mold blank 2 mixture: Weigh WC powder, Co powder, and Cr3C2 powder (or use VC powder) as raw material ingredients. The particle diameter d of the WC powder is 0.6-6μm, and the mixed raw materials are wet. Ball milling, after the wet ball milling, the wet ball milled mixture is subjected to the first wet sieving, the first screened mixture is vacuum dried, and the vacuum dried mixture is subjected to the second time Sieved and then dried by wax to obtain the cemented carbide mixture of the mold embryo;

(3) Molding and pressing: firstly load the appropriate amount of cemented carbide base into the molding die, apply a pressure of 140MPa, and press the semi-circular groove and the discharge groove 3 on the upper part of the base (the relevant parameters are selected according to the set value) ), And then the appropriate amount of the cemented carbide mixture of the mold 2 is placed in the mold and placed in the groove, the pressure of 100-140MPa is applied to compact the mixture in the forming mold to obtain a gradient cemented carbide tailing compact;

(4) Sintering: The gradient cemented carbide drill tail mold is pressed at a rate of 1 ~ 3 ° C / min. First, it is heated to 300 ° C and kept for 250 ~ 300min, and then it is continuously heated to 1400-1450 ° C and kept for 30-50min. Then, the temperature was lowered at 1 ° C / min to obtain a sintered graded cemented carbide tail drill.

By setting a semi-circular, high-hardness mold base 2 on the lower hardness base 1, the arc-shaped contact surface of the mold base 2 distributes the stress on the interface of the mold base 2 and the base 1 to avoid shearing. Shear stress, mold life significantly increased.

Second embodiment: As shown in FIG. 4, the difference from the first embodiment lies in the structure of the mold blank 2. The profile of the intersection of the mold blank 2 and the left side of the base 1 is U-shaped, the bottom is semicircular, and the upper two sidewalls are vertical. Straight and parallel.

The distance between the right side of the mold blank 2 and the vertical groove 31 of the discharge groove 3 is 1 mm.

The cemented carbide of the base 1 is composed of WC powder, Co powder, and Cr3C2 powder, wherein the particle diameter d of the WC powder is 16 μm at the bottom.

The cemented carbide of the mold blank 2 is composed of WC powder, Co powder, and VC powder, and the particle diameter d of the WC powder is 6 μm.

The rest is the same.

Embodiment 3: As shown in FIG. 1 and FIG. 5, the difference from Embodiment 2 lies in the structure of the mold base 2, which is not always equal from left to right along the profile size along the B-B longitudinal section in FIG. 1.

The distance between the right side of the mold blank 2 and the vertical groove 31 of the discharge groove 3 is 3 mm.

The cemented carbide of the base 1 is composed of WC powder, Co powder and Cr3C2 powder, wherein the particle diameter d of the WC powder is 11 μm,

The cemented carbide of the mold blank 2 is composed of WC powder, Co powder, and VC powder, and the particle diameter d of the WC powder is 3.5 μm.

The rest is the same.

Embodiment 4: As shown in FIG. 6, the difference from Embodiment 2 is that the top surface of the mold blank 2 is not flush with the top surface of the base 1.

The distance between the right side of the mold blank 2 and the vertical groove 31 of the discharge groove 3 is 4 mm.

The cemented carbide of the base 1 is composed of WC powder, Co powder and Cr3C2 powder, wherein the particle diameter d of the WC powder is 13 μm,

The cemented carbide of the mold blank 2 is composed of WC powder, Co powder, and VC powder, and the particle diameter d of the WC powder is 3 μm.

The rest is the same.

Embodiment 5: As shown in FIG. 7, the difference from Embodiment 1 lies in the structure of the mold base 2. The outline of the intersection of the mold base 2 and the left side of the base 1 is polygonal. The distance between the right side of the mold blank 2 and the vertical groove 31 of the discharge groove 3 is 2 mm.

The rest is the same.

Embodiment 6: As shown in FIG. 8, the difference from Embodiment 1 lies in the structure of the mold base 2. The outline of the intersection of the mold base 2 and the left side of the base 1 is polygonal.

The rest is the same.

Embodiment 7: As shown in FIG. 9, the difference from Embodiment 1 lies in the structure of the mold base 2. The contour of the line of intersection of the mold base 2 and the left side of the base 1 is composed of straight lines and arcs.

The rest is the same.

Embodiment 8: As shown in FIG. 10, the difference from Embodiment 1 lies in the structure of the mold blank 2. The contour of the intersection of the mold blank 2 and the left side of the base 1 is composed of straight lines and arcs.

The rest is the same.

Ninth Embodiment: As shown in FIG. 11, the difference from the first embodiment lies in the structure of the mold blank 2. The contour of the line of intersection of the mold blank 2 and the left side of the base 1 is composed of straight lines and curves.

The rest is the same.

Embodiment 10: As shown in FIG. 12, the difference from Embodiment 1 lies in the structure of the mold base 2. The contour of the line of intersection of the mold base 2 and the left side of the base 1 is composed of multiple arcs.

The rest is the same.

Embodiment 11: As shown in FIG. 13, the difference from Embodiment 1 lies in the structure of the mold base 2. The outline of the intersection of the mold base 2 and the left side of the base 1 is composed of an arc and a curve.

The rest is the same.

Embodiment 12: As shown in FIG. 14, the difference from Embodiment 1 lies in the structure of the mold base 2. The outline of the intersection of the mold base 2 and the left side of the base 1 is composed of straight lines, arcs, and curves.

The rest is the same.

Embodiment 13: As shown in FIG. 15, the difference from Embodiment 1 lies in the structure of the mold base 2. The contour of the line of intersection of the mold base 2 and the top surface of the base 1 is composed of straight lines and arcs.

The rest is the same.

Embodiment 14: As shown in FIG. 16, the difference from Embodiment 1 is that the discharge groove 3 is a horizontal groove. The rest is the same.

The above descriptions are merely preferred embodiments of the present invention, and any equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

1‧‧‧ base

2‧‧‧mould

3‧‧‧ unloading tank

31‧‧‧vertical groove

32‧‧‧ horizontal groove

FIG. 1 is a schematic view of a gradient cemented carbide tail drill according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a graded cemented carbide drill tail die taken along A-A in FIG. 1 according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a graded cemented carbide drill tail die taken along line B-B in FIG. 1 according to an embodiment of the present invention. FIG. 4 is a schematic left side view of a gradient cemented carbide drill tail die according to the second embodiment of the present invention. Fig. 5 is a cross-sectional view of B-B in Fig. 1 of a third grade cemented carbide drill tail die according to the embodiment of the present invention. FIG. 6 is a schematic left side view of a fourth grade cemented carbide tail drill according to the embodiment of the present invention. FIG. 7 is a schematic left side view of a fifth grade cemented carbide drill tail die according to the embodiment of the present invention. FIG. 8 is a schematic left side view of a sixth grade cemented carbide drill tail die according to the embodiment of the present invention. FIG. 9 is a schematic left side view of a seventh grade cemented carbide drill tail die according to the embodiment of the present invention. FIG. 10 is a schematic left side view of an eight-gradient cemented carbide drill tail die according to the embodiment of the present invention. FIG. 11 is a schematic left side view of a ninth gradient cemented carbide drill tail die according to the embodiment of the present invention. FIG. 12 is a schematic left side view of a tenth grade cemented carbide drill tail die according to the embodiment of the present invention. FIG. 13 is a schematic left side view of a gradient cemented carbide drill tail die according to the eleventh embodiment of the present invention. 14 is a schematic left side view of a gradient cemented carbide drill tail die according to the twelfth embodiment of the present invention. FIG. 15 is a schematic diagram of a gradient cemented carbide tail drill according to the thirteenth embodiment of the present invention. FIG. 16 is a schematic view of a graded cemented carbide tail drill according to the fourteenth embodiment of the present invention.

Claims (10)

A graded cemented carbide drill tail die includes a base made of hard alloy. The base is provided with a mold blank. The base is also provided with a discharging groove. The discharging groove includes a vertical groove and a connection station. A horizontal groove in the middle of the vertical groove, the two ends of the vertical groove are communicated with the two opposite side walls of the base, and one end of the horizontal groove is communicated with the right wall of the base. The top surface of the base sinks into the interior of the base, the left side of the mold blank is flush with the left wall of the base, and the right side of the mold blank is not in communication with the discharge tank. The hardness of the embryo is higher than the hardness of the base, and the mold embryo and the base are combined by high temperature sintering. The gradient cemented carbide tail mold according to claim 1, wherein a top surface of the mold blank is flush with a top surface of the base. The gradient cemented carbide tail mold according to claim 1, wherein a distance between a right side of the mold blank and the discharge groove is 1 to 5 mm. The gradient cemented carbide tail mold according to claim 1, wherein the top surface of the mold blank is not flush with the top surface of the base. The gradient cemented carbide tail mold according to claim 1, wherein the cemented carbide of the base is composed of WC powder, Co powder, and Cr3C2 powder, wherein the particle diameter (d bottom) of the WC powder is 6-16 μm, and the mold The cemented carbide of the embryo is composed of WC powder, Co powder, and VC powder, and the particle diameter (d) of the WC powder is 0.6-6 μm. The gradient cemented carbide tail mold according to claim 1, wherein the discharge groove is a horizontal groove. The gradient cemented carbide drill die according to any one of claims 1 to 6, wherein the profile of the line of intersection of the mold embryo and the left side of the base is polygonal, or consists of multiple arcs, or consists of multiple curves , Or consisting of straight lines and arcs, or straight lines and curves, or arcs and curves, or straight lines, curves, and arcs. The gradient cemented carbide tail mold according to any one of claims 1 to 6, wherein the contour of the line of intersection of the mold embryo and the top surface of the base is polygonal, or consists of multiple arcs, or consists of multiple curves , Or consisting of straight lines and arcs, or straight lines and curves, or arcs and curves, or straight lines, curves, and arcs. The gradient cemented carbide tail mold according to any one of claims 1 to 6, wherein a longitudinal section profile size of the mold blank is always equal from left to right. The gradient cemented carbide tail mold according to any one of claims 1 to 6, wherein the longitudinal section profile size of the mold blank is not always equal from left to right.