WO2018221497A1 - 切削インサート用圧粉体の粉末成形プレス方法および粉末成形プレス装置 - Google Patents
切削インサート用圧粉体の粉末成形プレス方法および粉末成形プレス装置 Download PDFInfo
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- WO2018221497A1 WO2018221497A1 PCT/JP2018/020499 JP2018020499W WO2018221497A1 WO 2018221497 A1 WO2018221497 A1 WO 2018221497A1 JP 2018020499 W JP2018020499 W JP 2018020499W WO 2018221497 A1 WO2018221497 A1 WO 2018221497A1
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- molding
- cutting insert
- green compact
- insert
- powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/007—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a plurality of pressing members working in different directions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
- B30B11/027—Particular press methods or systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
- B30B15/022—Moulds for compacting material in powder, granular of pasta form
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
- B22F2003/033—Press-moulding apparatus therefor with multiple punches working in the same direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/005—Article surface comprising protrusions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/004—Filling molds with powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
- B30B11/04—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with a fixed mould
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2220/00—Shaping
- F16C2220/20—Shaping by sintering pulverised material, e.g. powder metallurgy
Definitions
- the present invention relates to a powder molding press method and a powder molding press apparatus for a green compact for a cutting insert sintered in a cutting insert.
- a cutting insert is formed in a molding space formed by a die, an upper punch, and a lower punch.
- a raw material powder of a green compact is filled, and this raw material powder is compressed by an upper punch and a lower punch and pressed by powder molding.
- the green compact for cutting inserts that has been pressed in this manner has a shape in which the upper and lower surfaces of the lower punch and the upper end of the lower punch are inverted symmetrically, and shrinks to a similar shape when sintered. And manufactured into a cutting insert.
- the cutting insert described in Patent Document 1 has a polygonal flat plate shape, and its upper and lower surfaces are also substantially planar, and therefore the upper and lower surfaces of the powder compact for cutting insert pressed by powder molding are also substantially planar. It becomes a shape.
- the green compact for a cutting insert that is sintered in the same manner has a shape in which the upper and lower surfaces are greatly uneven and the thickness between the upper and lower surfaces is partially different.
- such a green powder for cutting insert is reversed with the die and the upper punch having the lower end surface of the shape obtained by reversing the upper surface of the green powder for cutting insert with the surface symmetry and the lower surface with the surface symmetry.
- powder forming press is performed with the lower punch having the upper end surface of the shape, the density of the raw material powder in the green compact for cutting insert becomes dense and the thick portion in the thin portion between the upper and lower surfaces of the green compact for cutting insert Then, it becomes sparse and the density of the raw material powder varies. Therefore, when such a green compact for a cutting insert is sintered, the cutting insert is distorted or deformed due to variations in the density of the raw material powder.
- the present invention has been made under such a background, and powder compacting a green compact for a cutting insert that is sintered into a cutting insert in which the upper and lower surfaces are greatly uneven and the thickness between the upper and lower surfaces is partially different.
- Powder forming press method and powder forming press of green compact for cutting insert that suppresses variation in density of raw material powder during pressing and does not cause distortion or deformation even when sintered to cutting insert.
- the present invention comprises the following aspects.
- a green compact for a cutting insert that is sintered to a cutting insert, the upper and lower surfaces facing the insert center line direction in the cutting insert, and side surfaces arranged around these upper and lower surfaces
- a die punch having a lower punch having a lower surface forming surface for forming the lower surface of the green powder for cutting insert on the upper end surface, and a side surface forming surface for forming the side surface of the green powder for cutting insert on the inner peripheral surface.
- the molding space formed by the lower surface molding surface and the side surface molding surface is filled with the raw material powder of the green compact for cutting insert.
- a preforming upper punch having a preforming surface having a shape different from the shape obtained by reversing the upper surface of the green compact for cutting insert in plane symmetry is inserted into the molding space from above and preformed.
- An upper punch for final molding having an upper surface molding surface at the lower end surface for molding the upper surface of the green compact for cutting insert is inserted into the molding space from above, and the raw powder is pressed into the green compact for cutting insert.
- the upper surface of the final molding upper punch is a portion where the thickness of the preforming upper punch in the insert centerline direction between the upper and lower surfaces of the green compact for cutting insert is thin.
- the amount of protrusion below the molding surface is increased,
- a larger amount of the raw material powder is applied to the portion before the pre-forming than the thin portion in the thick portion in the insert center line direction between the upper and lower surfaces.
- a green compact for a cutting insert that is sintered into a cutting insert, having an upper and lower surface facing the insert center line direction in the cutting insert, and a side surface arranged around these upper and lower surfaces,
- the thickness of the insert center line direction between the upper and lower surfaces is partially different
- a lower punch having a lower surface molding surface for molding the lower surface of the green compact for cutting insert on the upper surface
- a die having a side molding surface for molding the side surface of the green compact for cutting insert on the inner peripheral surface and having a hole portion into which the lower punch is inserted from below; From above, a molding space formed by the lower surface molding surface and the side surface molding surface has a preforming surface having a shape different from the shape obtained by reversing the upper surface of the green compact for cutting insert in plane symmetry.
- An upper punch for preforming for preforming so that more raw material powder is filled with respect to the state before preforming than a thin part An insert center between the upper and lower surfaces is formed by inserting the upper surface molding surface for molding the upper surface of the green compact for cutting insert into the molding space from above and pre-molding by the upper punch for preforming.
- An apparatus for forming a green compact for a cutting insert comprising: an upper punch.
- the upper surface of the final molding upper punch is a portion where the preforming surface of the preforming upper punch has a thin thickness in the insert center line direction between the upper and lower surfaces of the green compact for cutting insert.
- a green compact for a cutting insert that is sintered to a cutting insert, the upper and lower surfaces facing the insert center line direction in the cutting insert, and side surfaces arranged around these upper and lower surfaces
- a die punch having a lower punch having a lower surface forming surface for forming the lower surface of the green powder for cutting insert on the upper end surface, and a side surface forming surface for forming the side surface of the green powder for cutting insert on the inner peripheral surface.
- the molding space formed by the lower surface molding surface and the side surface molding surface is filled with the raw material powder of the green compact for cutting insert,
- a preforming upper punch having a preforming surface having a shape different from the shape obtained by reversing the upper surface of the green compact for cutting insert in plane symmetry is inserted into the molding space from above and preformed.
- the preforming surface of the preforming upper punch is a portion where the thickness in the insert center line direction between the upper and lower surfaces of the green compact for cutting insert becomes thin.
- the amount of protrusion downward is larger than the upper molding surface,
- the pre-formed surface of the pre-forming upper punch has an inclined surface that protrudes downward toward the portion where the thickness in the insert center line direction between the upper and lower surfaces of the green compact for cutting insert decreases. Is formed, By guiding the raw material powder by this inclined surface, the portion of the green compact for cutting insert where the thickness in the insert center line direction between the upper and lower surfaces becomes thicker than the state before the pre-forming. 3.
- a green compact for a cutting insert that is sintered to a cutting insert, the upper and lower surfaces facing the insert center line direction in the cutting insert, and side surfaces arranged around these upper and lower surfaces,
- the thickness of the insert center line direction between the upper and lower surfaces is partially different
- a lower punch having a lower surface molding surface for molding the lower surface of the green compact for cutting insert on the upper surface
- a die having a side molding surface for molding the side surface of the green compact for cutting insert on the inner peripheral surface and having a hole portion into which the lower punch is inserted from below; From above, a molding space formed by the lower surface molding surface and the side surface molding surface has a preforming surface having a shape different from the shape obtained by reversing the upper surface of the green compact for cutting insert in plane symmetry.
- the raw material powder of the green compact for cutting insert filled in the molding space is formed into a thickness in the insert center line direction between the upper and lower surfaces of the green compact for cutting insert.
- the raw material powder is moved from the portion where the thickness is reduced by the preforming surface so that the raw material powder is filled in the thickened portion with respect to the state before the preforming.
- An upper punch for preforming for molding The upper surface of the green compact for cutting insert has an upper surface molding surface at the lower end surface, is inserted into the molding space from above, is preformed by the upper preforming punch, and the green compact for cutting insert is used.
- a powder molding press apparatus for compacting powder for cutting insert comprising: an upper punch for final molding that performs powder molding pressing on the green compact for insert.
- the preforming surface of the preforming upper punch is a portion where the thickness in the insert center line direction between the upper and lower surfaces of the green compact for cutting insert becomes thin.
- the pre-formed surface of the pre-forming upper punch has an inclined surface that protrudes downward toward the portion where the thickness in the insert center line direction between the upper and lower surfaces of the green compact for cutting insert becomes thinner.
- the upper surface is molded in a shape obtained by inverting the upper surface of the green compact for cutting insert symmetrically.
- the shape is different from the shape obtained by inverting this upper surface in plane symmetry, that is, the shape different from the upper surface molding surface of the upper punch for final molding.
- An upper punch for preforming having a preformed surface is inserted into the molding space and the raw material powder filled in the molding space is preformed, so that the thickness in the insert center line direction between the upper and lower surfaces is increased. The raw material powder is filled more with respect to the state before the preforming than the thin part.
- the thickness in the insert center line direction between the upper and lower surfaces is filled with more raw material powder than before preforming, and the part with the thinner thickness in the insert center line direction between the upper and lower surfaces is filled with less raw material powder than the thicker part.
- the density of the raw material powder can be made uniform in the green compact for a cutting insert that has been finally powder-formed and pressed. For this reason, in a cutting insert manufactured by sintering such a green compact for a cutting insert, it is possible to suppress the occurrence of distortion and deformation.
- the upper punch for preforming in this way, the raw material powder in the portion before the preforming is thicker in the portion where the thickness in the insert center line direction between the upper and lower surfaces is thicker than the portion where the thickness is thin.
- the preforming surface of the upper punch for preforming is used for final molding at a portion where the thickness in the insert center line direction between the upper and lower surfaces of the green compact for cutting insert is thin. Increase the amount of protrusion downward from the upper molding surface of the upper punch, and extrude the raw material powder filled in the thinned portion with the preformed surface with a large protruding amount, and move it to the thickened portion. You can make it.
- an inclined surface is formed on the preforming surface of the preforming upper punch so as to protrude downward as the thickness in the insert centerline direction between the upper and lower surfaces of the green compact for cutting insert decreases.
- the raw material powder in the insert centerline direction between the upper and lower surfaces is thicker than the thin portion, and more raw material than the pre-molded state. If preformed so that the powder is filled, the raw material powder can be smoothly extruded from the portion where the thickness in the insert center line direction between the upper and lower surfaces becomes thinner to the portion where the thickness becomes thinner. it can.
- the preform has a preforming surface on the lower end surface in which the direction of the concavity and convexity is opposite to the shape obtained by reversing the upper surface of the cutting insert green compact in a plane symmetry. Insert the upper punch into the molding space from above to preform the raw material powder, By refilling the raw material powder onto the preformed raw material powder, the thickness of the insert in the center line direction between the upper and lower surfaces is thicker than the thin portion.
- the final molding upper punch having an upper surface molding surface at the lower end surface for molding the upper surface of the green compact for cutting insert is inserted into the molding space from above, and the raw material refilled with the preformed raw material powder.
- a powder molding press method of a green compact for cutting insert wherein the powder is pressed into the green compact for cutting insert.
- the preforming surface of the preforming upper punch protrudes downward as the thickness in the insert center line direction between the upper and lower surfaces of the green compact for cutting insert increases from a thin portion toward a thicker portion.
- An inclined surface is formed, By compressing the raw material powder previously filled by this inclined surface, the portion in the insert centerline direction between the upper and lower surfaces is thicker than the thin portion, compared to the state before the preforming.
- a green compact for a cutting insert sintered in a cutting insert having an upper and lower surface facing the insert center line direction in the cutting insert, and side surfaces arranged around these upper and lower surfaces,
- the thickness of the insert center line direction between the upper and lower surfaces is partially different
- a lower punch having a lower surface molding surface for molding the lower surface of the green compact for cutting insert on the upper surface
- a die having a side molding surface for molding the side surface of the green compact for cutting insert on the inner peripheral surface and having a hole portion into which the lower punch is inserted from below; Molding formed by the lower surface molding surface and the side surface molding surface having a preformed surface with the concave and convex directions opposite to the shape obtained by reversing the upper surface of the green compact for cutting insert in plane symmetry.
- An upper punch for preforming that is inserted into the space from above and preforms the raw material powder of the green compact for cutting insert filled in the molding space;
- the upper surface of the green compact for cutting insert has an upper surface molding surface at the lower end surface, inserted into the molding space from above, and pre-formed raw material powder and refilled on the raw material powder.
- a powder molding press apparatus for compacting powder for cutting insert comprising: an upper punch for final molding for subjecting the raw material powder to powder compacting and pressing to the green compact for cutting insert.
- the preforming surface of the preforming upper punch protrudes downward as the thickness in the insert center line direction between the upper and lower surfaces of the green compact for cutting insert increases from a thin portion toward a thicker portion. An inclined surface is formed.
- the molding space formed by the lower surface molding surface and the side surface molding surface is filled with the raw material powder of the green compact for cutting insert
- an upper punch for preforming having a preformed surface on the lower end surface in which the unevenness direction is opposite to the shape obtained by reversing the upper surface of the green compact for cutting insert in a plane symmetry, and the lower end portion of the die hole in the die Insert the raw material powder from above into the molding space so as to fit into the part, and preform the raw material powder,
- the thickness of the insert in the center line direction between the upper and lower surfaces is thicker than the thin portion.
- the final molding upper punch having an upper surface molding surface at the lower end surface for molding the upper surface of the green compact for cutting insert is inserted into the molding space from above, and the raw material refilled with the preformed raw material powder.
- a powder molding press method of a green compact for cutting insert wherein the powder is pressed into the green compact for cutting insert.
- the concavo-convex direction is opposite to the shape obtained by reversing the upper surface of the green powder for cutting insert in plane symmetry.
- An inclined surface that protrudes downward is formed as the thickness in the insert center line direction between the upper and lower surfaces in the direction from the thin portion toward the thick portion, By compressing the raw material powder previously filled by this inclined surface, the portion in the insert centerline direction between the upper and lower surfaces is thicker than the thin portion, compared to the state before the preforming.
- a green compact for a cutting insert that is sintered to a cutting insert having an upper and lower surface facing the insert center line direction in the cutting insert, and side surfaces arranged around these upper and lower surfaces,
- the thickness of the insert center line direction between the upper and lower surfaces is partially different
- a lower punch having a lower surface molding surface for molding the lower surface of the green compact for cutting insert on the upper surface
- a die having a side molding surface for molding the side surface of the green compact for cutting insert on the inner peripheral surface and having a hole portion into which the lower punch is inserted from below;
- the shape of the green compact for cutting insert is inverted in plane symmetry.
- the lower surface has a preformed surface with the concave and convex directions opposite to each other, and the lower end is fitted into the hole of the die.
- An upper punch for preforming which is inserted from above into a molding space formed by the lower surface molding surface and the side surface molding surface, and preforms a raw material powder of the green compact for cutting insert filled in the molding space;
- the upper surface of the green compact for cutting insert has an upper surface molding surface at the lower end surface, inserted into the molding space from above, and pre-formed raw material powder and refilled on the raw material powder.
- a powder molding press apparatus for compacting powder for cutting insert comprising: an upper punch for final molding for subjecting the raw material powder to powder compacting and pressing to the green compact for cutting insert.
- the upper surface is molded in a shape obtained by reversing the upper surface of the green compact for cutting insert in plane symmetry.
- the shape of the upper surface of the upper surface of the upper surface of the final molding upper punch is reversed.
- An upper punch for preforming having a preforming surface whose concave and convex directions are opposite to the molding surface is inserted into the molding space, and the raw material powder is preformed.
- the depth of the upper surface of the raw material powder in the molding space becomes deeper at the portion where the thickness in the insert center line direction between the upper and lower surfaces is thicker than the thin portion in the green compact for cutting insert. Then, by refilling the raw material powder on the preformed raw material powder in this way, the thickness of the upper portion of the raw material powder is deep, that is, the thickness in the insert center line direction between the upper and lower surfaces of the cutting insert green compact. More raw material powder is refilled in the thicker portion than in the thinned portion with respect to the state before the preforming.
- the preformed raw material powder and the refilled raw material powder are powder-molded and pressed by a final molding upper punch and lower punch into a green compact for a cutting insert having a predetermined size and shape.
- a large amount of raw material powder is filled in the portion where the thickness in the insert center line direction between the upper and lower surfaces is thicker, and the portion where the thickness in the insert center line direction between the upper and lower surfaces is thinner than the thick portion. Since a small amount of raw material powder is filled, the density of the raw material powder can be made uniform in the green compact for a cutting insert that is finally subjected to powder forming press. Therefore, in a cutting insert manufactured by sintering such a green compact for a cutting insert, it is possible to suppress the occurrence of distortion and deformation.
- an inclined surface that protrudes downward as the thickness in the insert center line direction between the upper and lower surfaces of the green compact for cutting insert moves from a thin part to a thick part.
- the raw material powder formed and compressed previously by this inclined surface is compressed into a portion where the thickness in the insert center line direction between the upper and lower surfaces is thicker than the portion where the thickness is thinner than the pre-molding state. If the preform is molded so that a large amount of the raw material powder is refilled, the thickness of the insert center line direction between the upper and lower surfaces of the green compact for the cutting insert is increased on the upper surface of the preformed raw material powder.
- the green compact for cutting insert is used.
- the density of the raw material powder in the direction of the center line of the insert can be made uniform to prevent distortion and deformation, and a high-quality and high-quality cutting insert can be manufactured.
- a cutting insert produced by sintering a green compact for a cutting insert that has been powder-molded and pressed by the first and second embodiments of the powder molding press method and powder molding press apparatus of the green compact for a cutting insert of the present invention It is a perspective view shown. It is a top view of the cutting insert shown in FIG. It is a side view of the arrow X direction view in FIG. It is a figure which shows sectional drawing along the insert centerline of the die
- FIG. 4 a state in which a raw material powder is filled in a molding space formed by the lower surface molding surface of the lower punch and the side surface molding surface of the die (a state before preliminary molding), and an upper punch for preliminary molding
- FIG. It is a figure which shows the state which inserted the upper punch for preforming in the shaping
- FIG. 10 is a diagram showing a state where the final forming upper punch is inserted into the forming space from the state shown in FIG. 9.
- FIG. 14 the raw material powder is filled in the molding space formed by the lower surface molding surface of the lower punch and the side surface molding surface of the die (the state before preliminary molding), and the upper punch for preliminary molding,
- FIG. It is a figure which shows the state which inserted the upper punch for preforming in the shaping
- FIG. 1 to FIG. 3 sinter the green compact for cutting insert that has been powder-molded and pressed by the first or second embodiment of the powder molding press method and powder molding press apparatus of the present invention.
- the cutting insert manufactured by this is shown.
- FIG. 4 to FIG. 13 show a powder molding press apparatus for a green compact for a cutting insert according to an embodiment.
- the powder molding press method of this embodiment will also be described with reference to FIGS.
- the insert body 1 is made of a hard material such as cemented carbide, cermet, or ceramics.
- the upper and lower surfaces 2 and 3 are formed in a hexagonal plate shape and have a hexagonal shape, and six side surfaces 4 arranged around the upper and lower surfaces 2 and 3.
- a mounting hole 5 having a circular cross section penetrating the insert body 1 is opened, and the center line of the mounting hole 5 becomes the insert center line O in the cutting insert.
- the insert main body 1 has a rotationally symmetric shape about 120 ° around the insert center line O, and has an inverted symmetrical shape with respect to the upper and lower surfaces 2 and 3.
- the periphery of the opening of the attachment hole 5 is an annular flat portion perpendicular to the insert center line O, and this flat portion is above the insert body 1 except for the inside of the attachment hole 5.
- the lower surfaces 2 and 3 are the most recessed portions in the insert centerline O direction.
- the six corner portions of the upper and lower surfaces 2 and 3 are alternately formed as a first corner portion C1 and a second corner portion C2 in the circumferential direction.
- the first corner portion C1 of the lower surface 3 is located on the opposite side of the corner portion C1 in the insert center line O direction
- the second corner portion C2 of the upper surface 2 is located on the opposite side of the second corner portion C2 in the insert center line O direction. Corner portion C2 is located.
- the first corner portion C1 is formed with a corner blade 6 having a convex curve shape such as a convex arc when viewed from the direction of the insert center line O.
- a main cutting edge 7 is formed over the second corner portion C2 adjacent to one side of the first corner portion C1 in the direction (counterclockwise direction side in FIG. 2). Further, from the corner blade 6 to the second corner portion C2 adjacent to the other side (the clockwise direction side in FIG. 2) opposite to the side where the main cutting edge 7 extends in the circumferential direction of the upper and lower surfaces 2 and 3.
- a secondary cutting edge 8 is formed.
- one of the upper and lower surfaces 2 and 3 is a rake face, and the other is a landing surface on the bottom surface of an insert mounting seat of a cutting edge exchangeable cutting tool (not shown). Then, with this seating surface in close contact with the bottom surface of the insert mounting seat, a clamp screw inserted into the mounting hole 5 from the rake face side is screwed into a screw hole formed on the bottom surface, whereby the cutting edge exchangeable cutting tool Removably attached to.
- the cutting insert thus attached to the cutting edge-exchangeable cutting tool has a set of continuous corner blades 6, a main cutting edge 7, and a secondary cutting edge 8 on one of the upper and lower surfaces 2, 3 which are raked surfaces.
- the side surface 4 is parallel to the insert center line O, and serves as a relief surface for the corner blade 6, the main cutting edge 7, and the auxiliary cutting edge 8. That is, the cutting insert shown in FIGS. It is a type of cutting insert.
- the main cutting edge 7 and the auxiliary cutting edge 8 are recessed in the direction of the insert centerline O from the corner blade 6 located in the first corner portion C1 toward the second corner portion C2 adjacent in the circumferential direction.
- the first corner portion C1 of the insert body 1 is the most protruding portion in the direction of the insert centerline O
- the second corner portion C2 is the center of the insert at the outer peripheral edges of the upper and lower surfaces 2 and 3. It is the most recessed portion in the line O direction.
- the upper and lower surfaces 2 and 3 are inclined so as to be gradually recessed in the direction of the insert centerline O from the outer peripheral edge toward the flat portion around the opening of the mounting hole 5.
- the ratio h / H is set to be larger than 0.21, for example.
- the green compact P for cutting insert manufactured by sintering into such a cutting insert is substantially similar to the insert body 1 as shown in FIGS. 12 and 13 and has a size slightly larger than that of the insert body 1. It has and shrinks to the size of the insert body 1 by being sintered.
- FIGS. 6 to 13 portions corresponding to the sintered cutting inserts in the green compact P for cutting inserts are given the same reference numerals as those in FIGS. The portion corresponding to the insert will be described using the same name.
- the powder molding press apparatus of the present embodiment for performing powder molding press of the green compact P for cutting insert includes a die 111, a lower punch 112, and a pin 113 as shown in FIGS. 4 to 13, and FIGS.
- the preforming upper punch 114 as shown in FIG. 9 and the final forming upper punch 115 as shown in FIGS. 9 to 11 are provided. 6 to 9, the lower part of the die 111 and the lower punch 112, the upper part of the preliminary forming upper punch 114, and the upper part of the final forming upper punch 115 are not shown.
- the die 111 is formed so that a hole 111A having a cross section of an eccentric hexagon having the same size and shape as the cross section in the cross section perpendicular to the insert center line PO of the green compact P for cutting insert penetrates vertically. Therefore, the center line of the hole 111A is coaxial with the insert center line PO.
- the inner peripheral surface of the hole 111A is parallel to the insert center line PO, and is a side molding surface 111B that molds the side surface P4 of the green compact P for cutting insert.
- the upper surface 111C of the die 111 has a planar shape perpendicular to the insert center line PO.
- the lower punch 112 has an upper end formed in a size and shape that can be fitted into the hole 111A, and can be moved up and down with a predetermined stroke in the direction of the insert center line PO.
- the upper end is formed in the hole 111A.
- the lower punch 112 may be relatively inserted into the hole 111A from below by moving the die 111 up and down while fixing the lower punch 112, and both the die 111 and the lower punch 112 are moved up and down. It may be movable.
- the upper end surface of the lower punch 112, except for the central portion thereof, is 1 ⁇ 2 of the shape of the lower surface P3 of the green compact P for cutting insert and the depth in the insert center line PC direction of the mounting hole P5 on the lower surface P3 side.
- the lower surface forming surface 112A for forming the lower surface P3 of the green compact P for cutting insert is formed on this upper end surface. Is done.
- the lower punch 112 is formed with a through hole 112B having a circular cross section having a constant inner diameter centered on the insert center line PO so as to vertically penetrate the lower punch 112 along the insert center line PO.
- the cylindrical pin 113 having a circular cross section with a constant outer diameter is inserted into the through hole 112B while being fitted from below, with a predetermined stroke in the direction of the insert centerline PO. It can be moved up and down.
- An upper end surface 113A of the pin 113 has a planar shape perpendicular to the insert center line PO.
- the final molding upper punch 115 has a lower end formed in a size and shape that can be fitted into the hole 111A, and is also predetermined in the direction of the insert centerline PO. It is possible to move up and down with this stroke, and this lower end is inserted into the hole 111A while being fitted from above.
- the lower end surface of the final forming upper punch 115 has a shape of the upper surface P2 in the green compact P for cutting insert and a shape up to 1 ⁇ 2 of the depth in the insert center line PC direction in the mounting hole P5 on the upper surface P2 side.
- the upper surface molding surface 115A for molding the upper surface P2 of the green compact P for cutting insert is formed on this lower end surface.
- the portion of the first corner portion PC1 of the upper surface P2 that protrudes most in the direction is most recessed upward.
- a circular surface 115B that is perpendicular to the insert center line PC and that can be in contact with the upper end surface 113A of the pin 113 is formed at the center of the upper surface molding surface 115A that protrudes downward.
- the upper molding surface 115A is inclined so as to gradually protrude downward.
- the lower end of the upper punch 114 for preforming is formed in a size and shape that can be fitted into the hole 111A, and can be moved up and down with a predetermined stroke in the direction of the insert centerline PO.
- the preforming upper punch 114 is formed with a receiving hole 114A having a circular cross section centered on the insert center line PO along the insert center line PO.
- the upper end portion of the pin 113 is fitted into the receiving hole 114A.
- the inner diameter can be accommodated.
- a preforming surface 114B is formed on the lower end surface of the preforming upper punch 114, and the preforming surface 114B has a shape obtained by inverting the upper surface P2 of the cutting insert green compact P in a plane symmetry. Are different in shape from the upper surface molding surface 115A of the upper punch 115 for final molding.
- the preforming surface 114B has a shape obtained by inverting the upper surface P2 of the green compact P for cutting insert in plane symmetry, that is, the shape of the upper surface molding surface 115A of the upper punch 115 for final molding. In the portion of the green compact P where the thickness in the direction of the insert center line PO between the upper and lower surfaces P2 and P3 is thin, the amount of protrusion downward from the outer peripheral edge of the preforming surface 114B is increased.
- the distance H between the first corner portions PC1 of the upper and lower surfaces P2, P3 is the largest, and the thickness in the insert centerline PO direction is the largest in this portion.
- the upper and lower surfaces P2 and P3 and the opening hole P5 periphery of the opening hole P5 is most recessed in the insert centerline PO direction, and the thickness in the insert centerline PO direction is the smallest at this portion.
- the preforming surface 114B of the preforming upper punch 114 of the present embodiment is formed around the opening of the mounting hole P5 in the central portion from the portion where the first corner portion PC1 is molded on the upper surface P2 of the green compact P for cutting insert.
- the thickness of the cutting insert green compact P in the insert center line PO direction has a thickness.
- the thicker the portion the larger the retraction amount. That is, in the present embodiment, in the green compact P for cutting insert, the thickness of the portion between the first corner portions PC1 of the upper and lower surfaces P2 and P3 in the direction of the insert centerline PO is the second corner portion PC2. Since it is larger than the thickness of the part between them, in the preforming surface 114B, the retreat amount of the part corresponding to the first corner part PC1 on the upper surface P2 from the lower end thereof is the part corresponding to the second corner part PC2. It is formed so as to be larger than the retreat amount.
- the preforming surface 114B of the preforming upper punch 114 has a thickness in the direction of the insert centerline PO between the upper and lower surfaces P2 and P3 of the green compact P for cutting insert, excluding the periphery of the accommodation hole 114A.
- An inclined surface 114 ⁇ / b> C that protrudes downward as it goes toward the thinner portion is formed. That is, in the present embodiment, an inclined surface inclined surface 114C is formed that protrudes downward toward the central portion of the preforming surface 114B that forms the periphery of the opening portion of the mounting hole P5 where the thickness is reduced.
- the inclined surface inclined surface 114C of the present embodiment has a plurality of (two steps in this embodiment) planar inclined surface portions 114a in which the inclination angle with respect to the insert center line PO decreases toward the portion where the thickness decreases. 114b.
- the lower surface molding surface 112 ⁇ / b> A is the upper surface of the die 111.
- the lower punch 112 is lowered so as to be located at a predetermined depth from 111C, and the pin 113 is moved from the lower punch 112 so that the upper end surface 113A thereof is at a position equal to the upper surface 111C of the die 111 and the insert centerline PO direction.
- a molding space Q for the green compact P for cutting insert is formed by the side molding surface 111B of the die 111, the lower molding surface 112A of the lower punch 112, and the outer peripheral surface of the pin 113.
- the forming space Q is filled with raw material powder R of a hard material such as cemented carbide, cermet, ceramics or the like that forms the insert body 1.
- the filling of the raw material powder R is performed by moving a feeder (not shown) horizontally so as to be in sliding contact with the upper surface 111C of the die 111 and positioning the feeder 111 at the opening of the hole 111A on the upper surface 111C.
- the raw material powder R more than the inner volume of the molding space Q is supplied to the mold 111, and then the feeder is moved backward horizontally so as to be in sliding contact with the upper surface 111C of the die 111.
- the feeder for supplying the raw material powder R of the powder molding press apparatus of the present embodiment includes a scraping means for scraping the raw material powder R along the upper surface 111C of the die 111.
- the molding space Q is filled with a certain amount of the raw material powder R. In this way, the state in which the upper surface of the raw material powder R is frayed and the molding space Q is filled with a certain amount of the raw material powder R is the state before the preliminary molding in the present embodiment.
- the preforming upper punch 114 is arranged on the molding space Q as shown in FIG. 6, and the lower end thereof is fitted into the hole 111A of the die 111 from above.
- the raw material powder R is preformed as shown in FIGS. If the lower punch 112 is lowered and the upper surface of the raw material powder R is moved back to a position lower than the upper surface 111C of the die 111 before the insertion of the preforming upper punch 114, the hole 111A on the upper surface 111C is formed. It is possible to prevent the raw material powder R from overflowing during insertion from the opening.
- the raw material powder R moves toward the thickened portion, and more raw material powder R is in the green compact P for cutting insert than the thin portion in the direction of the insert centerline PO in the state before the preforming. The thick part will be filled.
- the raw material powder R moves from the periphery of the opening portion of the mounting hole P5 on the upper surface P2 of the green compact P for cutting insert to the side molding surface 111B side of the outer die 111. .
- a portion between the first corner portions C1 of the upper and lower surfaces P2 and P3 having a large thickness in the insert centerline PO direction is a portion between the second corner portions PC2. More raw material powder R will move with respect to the state before preforming.
- the preforming upper punch 114 is raised and pulled out from the hole 111A and then removed from the molding space Q.
- the punch 115 is disposed on the molding space Q, and the lower end thereof is inserted and lowered so as to be fitted into the hole 111A.
- the lower molding surface 112A of the lower punch 112 and the final molding are performed.
- the raw powder R is compressed between the upper surface molding surface 115A of the upper punch 115 and pressed for powder molding, whereby the green compact P for cutting insert is finally molded.
- the circular surface 115B contacts the upper end surface 113A of the pin 113, and thereafter the pin 113 descends together with the final molding upper punch 115 as shown in FIG.
- a powder molding press is performed.
- the upper punch 115 for final forming is raised and pulled out from the hole 111A of the die 111, and then the lower portion as shown in FIGS.
- the punch 112 is raised so that the lower surface molding surface 112A protrudes from the upper surface 111C of the die 111, and the green compact P for cutting insert that is finally formed is taken out.
- the green compact P for cutting insert thus finally formed is sintered, and the cutting insert as shown in FIGS. 1 to 3 is manufactured.
- the powder molding press method and the powder molding press apparatus for the green compact P for cutting insert having the above-described configuration, between the lower surface molding surface 112A of the lower punch 112 and the upper surface molding surface 115A of the upper punch 115 for final molding.
- the raw material powder R is preformed by the preforming upper punch 114 having the preforming surface 114B, so that the thickness in the insert centerline PO direction between the upper and lower surfaces P2, P3 in the green compact P for cutting insert is thick.
- the raw material powder R can be moved so that more raw material powder R is filled with respect to the state before the preforming than the thin portion.
- the preformed raw material powder R is finally formed into the cutting insert green compact P having a predetermined size and shape by the final forming upper punch 115, the upper surface forming surface 115A and the lower surface forming surface 112A are formed. Since the raw material powder R having a filling amount corresponding to the thickness in the direction of the insert center line PO between the upper and lower surfaces P2 and P3 of the green compact P for cutting insert is filled in between. In the green compact P, the density of the raw material powder R can be made uniform.
- the upper and lower surfaces 2, 3 of the insert main body 1 are Even if the surface is greatly uneven and the thickness between the upper and lower surfaces 2 and 3 is partially different, it is possible to manufacture a cutting insert with high accuracy.
- the thicker portion in the direction of the insert center line PO between the upper and lower surfaces P2 and P3 is thicker than the thin portion.
- the preforming surface 114B of the preforming upper punch 114 is formed in the direction of the insert center line PO between the upper and lower surfaces P2 and P3 of the green compact P for cutting insert.
- the final forming upper punch 115 for forming the upper surface P2 is formed so as to protrude more downward than the upper surface forming surface 115A.
- the raw material powder R is pushed out from the portion where the thickness in the direction of the insert centerline PO in the green compact P for the cutting insert is reduced by the preforming surface 114B having a large downward protruding amount in this way, and moves a lot. After that, it is possible to adjust the density of the raw material powder R more uniformly by performing powder molding press with the upper surface molding surface 115A of the upper punch 115 for final molding, and to manufacture a highly accurate cutting insert more reliably. it can.
- the pre-forming surface 114B of the pre-forming upper punch 114 moves downward as the thickness in the direction of the insert center line PO between the upper and lower surfaces P2, P3 of the cutting insert green compact P decreases.
- An inclined surface inclined surface 114C is formed so as to protrude from the surface. For this reason, this inclined surface inclined surface 114C can smoothly guide the raw material powder R to the thick portion in the direction of the insert center line PO between the upper and lower surfaces P2, P3, and the powder forming press time per one Even if it is short, it is possible to reliably mold the green compact P for cutting insert having a uniform density, and the production efficiency can be improved.
- the inclined surface inclined surface 114C has a plurality of inclination angles with respect to the insert center line PO that become smaller toward the portion where the thickness between the upper and lower surfaces P2, P3 of the cutting insert green compact P becomes thinner. It is formed by stepped inclined surface portions 114a and 114b, and the raw material powder R can be extruded more smoothly from the inclined surface portion 114a having a small inclination angle to the large inclined surface portion 114b, and even in a shorter powder forming press time. It becomes possible to mold the green compact P for cutting insert with a high density.
- the inclined surface portions 114a and 114b are planar, but for example, the inclined surface inclined surface 114C has a cross section along the insert center line PO in a concave curve shape or a convex curve shape.
- the raw material powder R may be guided from a thin portion in the direction of the insert center line PO between the upper and lower surfaces P2, P3 of the green compact P for cutting insert to a thick portion. Further, the raw material powder R may be guided by combining the inclined surface inclined surface 114C having a concave or convex cross section and the planar inclined surface portions 114a and 114b.
- the shape of the insert body 1 and the cutting insert green compact P is not limited, and when the green compact P for cutting insert manufactured as a positive type cutting insert is subjected to powder molding press It is also applicable to.
- the preforming may be performed a plurality of times, and the raw material powder R may be refilled during the plurality of times of preforming.
- FIG. 1 to FIG. 3 are performed by the powder molding press according to the first and second embodiments of the powder molding press method and powder molding press apparatus of the green compact for cutting insert of the present invention.
- the cutting insert manufactured by sintering the compacting powder for cutting inserts shown is shown.
- FIG. 14 to FIG. 23 show a powder molding press apparatus for a green compact for a cutting insert according to a second embodiment.
- the powder molding press method of this embodiment will also be described with reference to FIGS.
- the features of the cutting insert manufactured by sintering the green compact for cutting insert that has been powder-molded and pressed by the powder molding press method and powder molding press apparatus of the green compact for cutting insert of the second embodiment of the present invention are as follows: Since it is the same as that of 1st embodiment, detailed description is abbreviate
- the green compact P for a cutting insert manufactured by sintering into such a cutting insert is substantially similar to the insert main body 1 as shown in FIGS. 22 and 23 and has a size slightly larger than the insert main body 1. It has and shrinks to the size of the insert body 1 by being sintered.
- FIG. 16 to FIG. 23 the portion corresponding to the sintered cutting insert in the green compact P for cutting insert is given the same reference numeral as that in FIG. 1 to FIG. The portion corresponding to the insert will be described using the same name.
- the powder molding press apparatus of the present embodiment for performing powder molding press of the green compact P for cutting insert includes a die 211, a lower punch 212 and a pin 213 as shown in FIGS. 14 to 23, and FIGS.
- the preforming upper punch 214 as shown in FIG. 19 and the final molding upper punch 215 as shown in FIGS. 19 to 21 are provided. 16 to 19, the lower part of the die 211 and the lower punch 212, the upper part of the preliminary forming upper punch 214, and the upper part of the final forming upper punch 215 are not shown.
- the die 211 is formed so that a hole 211A having a cross section of an eccentric hexagon having the same size and shape as the cross section in the cross section perpendicular to the insert center line PO of the green compact P for cutting insert penetrates vertically. Therefore, the center line of the hole 211A is coaxial with the insert center line PO.
- the inner peripheral surface of the hole 211A is parallel to the insert center line PO, and serves as a side molding surface 211B for molding the side surface P4 of the green compact P for cutting insert.
- the upper surface 211C of the die 211 has a planar shape perpendicular to the insert center line PO.
- the lower punch 212 has an upper end formed in a size and shape that can be fitted into the hole 211A, and can be moved up and down with a predetermined stroke in the direction of the insert center line PO. And inserted from below. Note that the lower punch 212 may be relatively inserted into the hole 211A from below by moving the die 211 up and down with the lower punch 212 fixed, and both the die 211 and the lower punch 212 are moved up and down. It may be movable.
- the upper end surface of the lower punch 212 is 1 ⁇ 2 of the shape of the lower surface P3 of the cutting insert green compact P and the depth of the mounting hole P5 on the lower surface P3 side in the insert center line PC direction, except for the central portion.
- the lower surface forming surface 212A for forming the lower surface P3 of the green compact P for cutting insert is formed on this upper end surface. Is done.
- the lower punch 212 is formed with a through hole 212B having a circular cross section with a constant inner diameter centered on the insert center line PO so as to vertically penetrate the lower punch 212 along the insert center line PO.
- the cylindrical pin 213 having a circular cross-section with a constant outer diameter is inserted into the through-hole 212B while being fitted from below, with a predetermined stroke in the direction of the insert centerline PO. It can be moved up and down.
- An upper end surface 213A of the pin 213 has a planar shape perpendicular to the insert center line PO.
- the final molding upper punch 215 has a lower end formed in a size and shape that can be fitted into the hole 211A, and is also predetermined in the direction of the insert centerline PO. It is possible to move up and down with this stroke, and this lower end is inserted while being fitted into the hole 211A from above.
- the lower end surface of the final forming upper punch 215 has a shape of the upper surface P2 of the green compact P for cutting insert and a shape up to 1 ⁇ 2 of the depth in the direction of the insert center line PC in the mounting hole P5 on the upper surface P2 side.
- the upper surface forming surface 215A for forming the upper surface P2 of the green compact P for cutting insert is formed on this lower end surface.
- the portion of the first corner portion PC1 of the upper surface P2 that protrudes most in the direction is most recessed upward.
- a circular surface 215B that is perpendicular to the insert center line PC and that can contact the upper end surface 13A of the pin 213 is formed at the center of the upper surface molding surface 215A that protrudes downward.
- the upper molding surface 215A is inclined so as to gradually protrude downward.
- the lower end of the upper punch 214 for preforming is formed in a size and shape that can be fitted into the hole 211A, and can be moved up and down with a predetermined stroke in the direction of the insert centerline PO.
- the preforming upper punch 214 is formed with a receiving hole 214A having a circular cross section centered on the insert center line PO along the insert center line PO.
- the upper end of the pin 213 is fitted into the receiving hole 214A.
- the inner diameter can be accommodated.
- a preforming surface 214B is formed on the lower end surface of the preforming upper punch 214, and the preforming surface 214B has a shape obtained by reversing the upper surface P2 of the cutting insert green compact P in plane symmetry. Are different from each other, and are therefore different from the upper surface molding surface 215A of the upper punch 215 for final molding.
- this pre-formed surface 214B is uneven with respect to the shape obtained by inverting the upper surface P2 of the green compact P for cutting insert in plane symmetry, that is, the shape of the upper surface forming surface 215A of the upper punch 215 for final forming.
- the shape is such that the direction of is opposite.
- the distance H between the first corner portions PC1 of the upper and lower surfaces P2, P3 is the largest, and the thickness in the insert centerline PO direction is the largest in this portion.
- the upper and lower surfaces P2 and P3 and the opening hole P5 periphery of the opening hole P5 is most recessed in the insert centerline PO direction, and the thickness in the insert centerline PO direction is the smallest at this portion.
- the preforming surface 214B of the preforming upper punch 214 of the present embodiment is such that the part of the upper surface P2 of the cutting insert green compact P corresponding to the first corner portion PC1 is preformed at the center of the upper surface P2.
- the portion corresponding to the periphery of the opening of the mounting hole P5 is formed so as to protrude downward from the central portion of the preforming surface 214B for preforming.
- the preforming surface 214B has a shape obtained by reversing the upper surface forming surface 215A of the final forming upper punch 215 in a plane symmetry with respect to a plane perpendicular to the insert center line PC, and the direction of the unevenness is reversed.
- the part of the upper surface P2 corresponding to the periphery of the first corner part PC1 is preliminarily shaped downward substantially toward the insert center line PO or toward the first corner part C1 side.
- the portion connecting the portion corresponding to the second corner portion PC2 and the central portion of the preforming surface 214B It protrudes downward.
- the fan-shaped planar portion for pre-molding the portion corresponding to the periphery of the first corner portion PC1 of the upper surface P2 from the portion having a small thickness in the insert centerline PO direction between the lower surfaces P2 and P3, that is, the dust for cutting insert Between the upper and lower surfaces P2, P3 of the body P between the thick portions in the direction of the insert center line PO, a conical inclined surface 214C is formed that protrudes downward toward the thick portion. Yes.
- the lower surface molding surface 212 ⁇ / b> A is the upper surface of the die 211.
- the lower punch 212 is lowered so as to be located at a predetermined depth from 211C, and the pin 213 is moved from the lower punch 212 so that the upper end surface 213A thereof is at the same position as the upper surface 211C of the die 211 and the insert center line PO.
- a molding space Q of the green compact P for cutting insert is formed by the side molding surface 211B of the die 211, the lower surface molding surface 212A of the lower punch 212, and the outer peripheral surface of the pin 213.
- the forming space Q is filled with raw material powder R of a hard material such as cemented carbide, cermet, ceramics or the like that forms the insert body 1.
- the filling of the raw material powder R is performed by moving a feeder (not shown) horizontally so as to be in sliding contact with the upper surface 211C of the die 211 so as to be positioned at the opening of the hole 211A on the upper surface 211C.
- the raw material powder R more than the inner volume of the molding space Q is supplied to the substrate, and then the feeder is horizontally retracted so as to be in sliding contact with the upper surface 211C of the die 211.
- the feeder for supplying the raw material powder R of the powder molding press apparatus of the present embodiment includes a scraping means for scraping the raw material powder R along the upper surface 211C of the die 211.
- the molding space Q is filled with a certain amount of the raw material powder R. In this way, the state in which the upper surface of the raw material powder R is frayed and the molding space Q is filled with a certain amount of the raw material powder R is the state before the preliminary molding in the present embodiment.
- the preforming upper punch 214 is disposed on the molding space Q as shown in FIG. 16, and the lower end thereof is fitted into the hole 211A of the die 211 from above.
- the raw material powder R is preformed by the preforming surface 214B as shown in FIGS. If the lower punch 212 is lowered and the upper surface of the raw material powder R is moved back to a position lower than the upper surface 211C of the die 211 before the insertion of the preforming upper punch 214, the hole 211A on the upper surface 211C is provided. It is possible to prevent the raw material powder R from overflowing during insertion from the opening.
- the raw powder R filled in the molding space Q as shown in FIG. 18 by the preforming by the preforming upper punch 214 becomes the insert center line between the upper and lower surfaces P2 and P3 in the green compact P for cutting insert.
- the portion where the thickness in the PO direction becomes thicker it is compressed so as to be pushed deeper than the portion where the thickness in the insert centerline PO direction becomes thinner, and the depth of the upper surface of the raw material powder R is between the upper and lower surfaces P2, P3.
- the portion where the thickness in the direction of the insert center line PO increases is deepened.
- the preforming upper punch 214 is raised and pulled out from the hole 211A, then removed from the molding space Q, and then the same kind as the raw material powder R that is initially filled. In some cases, another kind of raw material powder R is refilled.
- the refilling method is the same as in the first filling, and the upper surface of the refilled raw material powder R is scraped flush with the upper surface 211C of the die 211. Therefore, as shown in FIG. 19, in the green compact P for cutting insert in which the upper surface of the raw material powder R initially filled and preformed becomes deep, the thickness in the insert centerline PO direction between the upper and lower surfaces P2 and P3 is large. In the thickened portion, many raw material powders R are refilled with respect to the state before the preforming.
- the final molding upper punch 215 is disposed on the molding space Q as shown in FIG. 19, and the lower end thereof is inserted into the hole 211A. 20 and 21, the raw material powder R initially filled is refilled between the lower surface molding surface 212A of the lower punch 212 and the upper surface molding surface 215A of the upper punch 215 for final molding as shown in FIGS.
- the raw material powder R is compressed and powder-molded and pressed to form a green compact P for cutting insert.
- the raw material powder R refilled by lowering the lower punch 212 is moved back to a position lower than the upper surface 211C of the die 211 even before the lower punch 215 for final molding is lowered, the raw material powder It is possible to prevent R from overflowing from the hole 211A. Further, the circular surface 215B of the upper surface molding surface 215A abuts on the upper end surface 213A of the pin 213 during the lowering of the final molding upper punch 215, and thereafter, the pin 213 is used for final molding as shown in FIG. The powder forming press is performed while descending together with the upper punch 215.
- the upper punch 215 for final forming is raised and pulled out from the hole 211A of the die 211, and then the lower portion as shown in FIGS. 22 and 23.
- the punch 212 is raised so that the lower surface molding surface 212A protrudes from the upper surface 211C of the die 211, and the green compact P for cutting insert that is finally formed is taken out.
- the green compact P for cutting insert thus finally formed is sintered, and the cutting insert as shown in FIGS. 1 to 3 is manufactured.
- the pre-forming upper punch 214 having the pre-forming surface 214B whose direction is opposite, that is, the upper surface forming surface 215A of the upper punch 215 for final forming is opposite to the direction of the unevenness is inserted into the forming space Q and is filled first.
- the raw material powder R is preformed.
- the depth of the upper surface of the raw material powder R in the molding space Q is a portion where the thickness in the direction of the insert centerline PO between the upper and lower surfaces P2, P3 in the green compact P for cutting insert is as described above. Becomes deeper than the thin part.
- a portion where the upper surface of the raw material powder R initially filled and preformed is deep, that is, a compact for cutting insert.
- More raw material powder R is refilled in the part before the pre-molding in the thick part in the insert center line PO direction between the upper and lower surfaces P2, P3 of the body P than in the thin part. .
- the preformed raw material powder R and the refilled raw material powder R are powder-molded and pressed by the final molding upper punch 215 and the lower punch 212 into the green compact P for cutting insert having a predetermined size and shape. Is filled with a large amount of raw material powder R in the portion of the insert center line PO direction between the upper and lower surfaces P2 and P3, and the thin portion is filled with a smaller amount of raw material powder R than the thicker portion. Therefore, the density of the raw material powder R can be made uniform in the green compact P for a cutting insert that has been finally powder-formed and pressed.
- a portion having a small thickness in the direction of the insert center line PO between the upper and lower surfaces P2 and P3 of the green compact P for cutting insert is preformed on the preforming surface 214B of the preforming upper punch 214.
- An inclined surface 214C that protrudes downward from the portion toward the portion to be preformed is formed between these portions, and between these portions, the raw material powder previously filled by the inclined surface 214C is formed. R is compressed and preformed.
- the inclined surface 214C has a substantially conical shape and is formed so that the cross section along the insert center line PO is linear.
- the inclined surface 214C is formed on the insert center line.
- the cross section along the PO may be formed into a convex curve shape or a concave curve shape, and may be preformed.
- the shape of the insert body 1 and the cutting insert green compact P is not limited, and when the green compact P for cutting insert manufactured as a positive type cutting insert is subjected to powder molding press It is also applicable to.
- the preforming may be performed a plurality of times, and the raw material powder R may be refilled during the plurality of times of preforming.
- the insert centerline direction in the green compact for cutting insert is manufactured. It is possible to make the density of the raw material powder uniform to suppress the occurrence of distortion and deformation, and to manufacture a high-quality and high-quality cutting insert.
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Abstract
Description
本願は、2017年5月29日に、日本に出願された特願2017-105548号及び特願2017-105549に基づき優先権を主張し、その内容をここに援用する。
上記切削インサート用圧粉体の上記下面を成形する下面成形面を上端面に有する下パンチを、上記切削インサート用圧粉体の上記側面を成形する側面成形面を内周面に有するダイの孔部に下方から挿入した状態で、上記下面成形面と上記側面成形面とにより形成される成形空間に上記切削インサート用圧粉体の原料粉末を充填し、
次いで、上記切削インサート用圧粉体の上面を面対称に反転した形状とは異なる形状の予備成形面を下端面に有する予備成形用上パンチを上記成形空間に上方から挿入して予備成形することにより、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が充填されるようにした上で、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有する最終成形用上パンチを上記成形空間に上方から挿入して上記原料粉末を上記切削インサート用圧粉体に粉末成形プレスすることを特徴とする切削インサート用圧粉体の粉末成形プレス方法。
この予備成形用上パンチの挿入により、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が充填されるように予備成形することを特徴とする上記(1)に記載の切削インサート用圧粉体の粉末成形プレス方法。
この傾斜面によって上記原料粉末を案内することにより、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が充填されるように予備成形することを特徴とする上記(2)に記載の切削インサート用圧粉体の粉末成形プレス方法。
上記切削インサート用圧粉体の上記下面を成形する下面成形面を上端面に有する下パンチと、
上記切削インサート用圧粉体の上記側面を成形する側面成形面を内周面に有して上記下パンチが下方から挿入される孔部を備えたダイと、
上記切削インサート用圧粉体の上面を面対称に反転した形状とは異なる形状の予備成形面を下端面に有して上記下面成形面と上記側面成形面とにより形成される成形空間に上方から挿入される予備成形用上パンチであって、上記成形空間に充填された上記切削インサート用圧粉体の原料粉末を、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が充填されるように予備成形するための予備成形用上パンチと、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有して上記成形空間に上方から挿入され、上記予備成形用上パンチによって予備成形されて、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多く充填された上記原料粉末を上記切削インサート用圧粉体に粉末成形プレスする最終成形用上パンチと、を備えたことを特徴とする切削インサート用圧粉体の粉末成形プレス装置。
上記切削インサート用圧粉体の上記下面を成形する下面成形面を上端面に有する下パンチを、上記切削インサート用圧粉体の上記側面を成形する側面成形面を内周面に有するダイの孔部に下方から挿入した状態で、上記下面成形面と上記側面成形面とにより形成される成形空間に上記切削インサート用圧粉体の原料粉末を充填し、
次いで、上記切削インサート用圧粉体の上面を面対称に反転した形状とは異なる形状の予備成形面を下端面に有する予備成形用上パンチを上記成形空間に上方から挿入して予備成形することにより、上記切削インサート用圧粉体における上記上下面間のインサート中心線方向の厚さが厚くなる部分に、予備成形前の状態に対して、より多くの上記原料粉末が充填されるように、上記厚さが薄くなる部分から上記原料粉末を移動させた上で、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有する最終成形用上パンチを上記成形空間に上方から挿入して上記原料粉末を上記切削インサート用圧粉体に粉末成形プレスすることを特徴とする切削インサート用圧粉体の粉末成形プレス方法。
この予備成形用上パンチの挿入により、上記切削インサート用圧粉体における上記上下面間のインサート中心線方向の厚さが厚くなる部分に、予備成形前の状態に対して、より多くの上記原料粉末が充填されるように、上記厚さが薄くなる部分から上記原料粉末を移動させて予備成形することを特徴とする上記(1A)に記載の切削インサート用圧粉体の粉末成形プレス方法。
この傾斜面によって上記原料粉末を案内することにより、上記切削インサート用圧粉体における上記上下面間のインサート中心線方向の厚さが厚くなる部分に、予備成形前の状態に対して、より多くの上記原料粉末が充填されるように、上記厚さが薄くなる部分から上記原料粉末を移動させて予備成形することを特徴とする請求項2に記載の切削インサート用圧粉体の粉末成形プレス方法。
上記切削インサート用圧粉体の上記下面を成形する下面成形面を上端面に有する下パンチと、
上記切削インサート用圧粉体の上記側面を成形する側面成形面を内周面に有して上記下パンチが下方から挿入される孔部を備えたダイと、
上記切削インサート用圧粉体の上面を面対称に反転した形状とは異なる形状の予備成形面を下端面に有して上記下面成形面と上記側面成形面とにより形成される成形空間に上方から挿入される予備成形用上パンチであって、上記成形空間に充填された上記切削インサート用圧粉体の原料粉末を、上記切削インサート用圧粉体における上記上下面間のインサート中心線方向の厚さが厚くなる部分に、予備成形前の状態に対して、より多くの上記原料粉末が充填されるように、上記予備成形面によって上記厚さが薄くなる部分から上記原料粉末を移動させて予備成形するための予備成形用上パンチと、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有して上記成形空間に上方から挿入され、上記予備成形用上パンチによって予備成形されて、上記切削インサート用圧粉体における上記上下面間のインサート中心線方向の厚さが厚くなる部分に、この厚さが薄くなる部分よりも、予備成形前の状態に対して、より多く充填された上記原料粉末を、上記切削インサート用圧粉体に粉末成形プレスする最終成形用上パンチと、を備えたことを特徴とする切削インサート用圧粉体の粉末成形プレス装置。
上記切削インサート用圧粉体の原料粉末を充填した後、上記切削インサート用圧粉体の上面を面対称に反転した形状とは凹凸の方向が逆向きの予備成形面を下端面に有する予備成形用上パンチを上記成形空間に上方から挿入して上記原料粉末を予備成形し、
この予備成形された原料粉末の上にさらに原料粉末を再充填することにより、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が充填されるようにした上で、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有する最終成形用上パンチを上記成形空間に上方から挿入して、予備成形された上記原料粉末と再充填された上記原料粉末とを上記切削インサート用圧粉体に粉末成形プレスすることを特徴とする切削インサート用圧粉体の粉末成形プレス方法。
この傾斜面によって先に充填された原料粉末を圧縮して、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が再充填されるように予備成形することを特徴とする上記(7)に記載の切削インサート用圧粉体の粉末成形プレス方法。
上記切削インサート用圧粉体の上記下面を成形する下面成形面を上端面に有する下パンチと、
上記切削インサート用圧粉体の上記側面を成形する側面成形面を内周面に有して上記下パンチが下方から挿入される孔部を備えたダイと、
上記切削インサート用圧粉体の上面を面対称に反転した形状とは凹凸の方向が逆向きの予備成形面を下端面に有して上記下面成形面と上記側面成形面とにより形成される成形空間に上方から挿入され、上記成形空間に充填された上記切削インサート用圧粉体の原料粉末を予備成形する予備成形用上パンチと、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有して上記成形空間に上方から挿入され、予備成形された上記原料粉末と、この原料粉末の上に再充填された原料粉末とを上記切削インサート用圧粉体に粉末成形プレスする最終成形用上パンチとを備えたことを特徴とする切削インサート用圧粉体の粉末成形プレス装置。
上記切削インサート用圧粉体の上記下面を成形する下面成形面を上端面に有する下パンチを、上記切削インサート用圧粉体の上記側面を成形する側面成形面を内周面に有するダイの孔部に下方から挿入した状態で、上記下面成形面と上記側面成形面とにより形成される成形空間に上記切削インサート用圧粉体の原料粉末を充填し、
次いで、上記切削インサート用圧粉体の上面を面対称に反転した形状とは凹凸の方向が逆向きの予備成形面を下端面に有する予備成形用上パンチを、その下端部を上記ダイの孔部に嵌め入れるように上記成形空間に上方から挿入して上記原料粉末を予備成形し、
この予備成形された原料粉末の上にさらに原料粉末を再充填することにより、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が充填されるようにした上で、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有する最終成形用上パンチを上記成形空間に上方から挿入して、予備成形された上記原料粉末と再充填された上記原料粉末とを上記切削インサート用圧粉体に粉末成形プレスすることを特徴とする切削インサート用圧粉体の粉末成形プレス方法。
この傾斜面によって先に充填された原料粉末を圧縮して、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が再充填されるように予備成形することを特徴とする上記(7A)に記載の切削インサート用圧粉体の粉末成形プレス方法。
上記切削インサート用圧粉体の上記下面を成形する下面成形面を上端面に有する下パンチと、
上記切削インサート用圧粉体の上記側面を成形する側面成形面を内周面に有して上記下パンチが下方から挿入される孔部を備えたダイと、
上記切削インサート用圧粉体の上面を面対称に反転した形状とは凹凸の方向が逆向きの予備成形面を下端面に有して、その下端部が上記ダイの孔部に嵌め入れられるように上記下面成形面と上記側面成形面とにより形成される成形空間に上方から挿入され、上記成形空間に充填された上記切削インサート用圧粉体の原料粉末を予備成形する予備成形用上パンチと、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有して上記成形空間に上方から挿入され、予備成形された上記原料粉末と、この原料粉末の上に再充填された原料粉末とを上記切削インサート用圧粉体に粉末成形プレスする最終成形用上パンチとを備えたことを特徴とする切削インサート用圧粉体の粉末成形プレス装置。
図1から図3は、本発明の切削インサート用圧粉体の粉末成形プレス方法および粉末成形プレス装置の第一又は第二実施形態によって粉末成形プレスされた切削インサート用圧粉体を焼結することにより製造される切削インサートを示す。図4から図13は、一実施形態の切削インサート用圧粉体の粉末成形プレス装置を示す。この図4から図13を用いて本実施形態の粉末成形プレス方法についても説明する。
そして、この着座面をインサート取付座の底面に密着させた状態で、すくい面側から取付孔5に挿通されたクランプネジが底面に形成されたネジ孔にねじ込まれることにより、刃先交換式切削工具に着脱可能に取り付けられる。
この孔部111Aの内周面はインサート中心線POに平行とされ、切削インサート用圧粉体Pの側面P4を成形する側面成形面111Bとされる。また、ダイ111の上面111Cは、インサート中心線POに垂直な平面状である。
この下パンチ112の上端面は、その中央部を除いて、切削インサート用圧粉体Pにおける下面P3の形状と、下面P3側の取付孔P5におけるインサート中心線PC方向の深さの1/2までの形状との凹凸をインサート中心線PCに垂直な平面に関して面対称に反転した形状とされており、この上端面に切削インサート用圧粉体Pの下面P3を成形する下面成形面112Aが形成される。
すなわち、本実施形態では、この厚さが薄くなる上記取付孔P5開口部周辺を成形する予備成形面114B中央部に向かうに従い下方に突出する傾斜面傾斜面114Cが形成されている。しかも、本実施形態の傾斜面傾斜面114Cは、この厚さが薄くなる部分に向けてインサート中心線POに対する傾斜角が小さくなる複数段(本実施形態では2段)の平面状の傾斜面部114a、114bによって形成されている。
このため、そうして最終成形された切削インサート用圧粉体Pを焼結するときには、歪みや変形が発生するのを抑制することが可能となるので、インサート本体1の上下面2、3が大きく凹凸していて上下面2、3間の厚さが部分的に異なっていても、精度の高い切削インサートを製造することが可能となる。
第一実施形態の説明に記載した通り、図1から図3は、本発明の切削インサート用圧粉体の粉末成形プレス方法および粉末成形プレス装置の第一及び第二実施形態によって粉末成形プレスされた切削インサート用圧粉体を焼結することにより製造される切削インサートを示す。図14から図23は、第二実施形態の切削インサート用圧粉体の粉末成形プレス装置を示す。図14から図23を用いて本実施形態の粉末成形プレス方法についても説明する。
この孔部211Aの内周面はインサート中心線POに平行とされ、切削インサート用圧粉体Pの側面P4を成形する側面成形面211Bとされる。また、ダイ211の上面211Cは、インサート中心線POに垂直な平面状である。
この下パンチ212の上端面は、その中央部を除いて、切削インサート用圧粉体Pにおける下面P3の形状と、下面P3側の取付孔P5におけるインサート中心線PC方向の深さの1/2までの形状との凹凸をインサート中心線PCに垂直な平面に関して面対称に反転した形状とされており、この上端面に切削インサート用圧粉体Pの下面P3を成形する下面成形面212Aが形成される。
2、P2 上面
3、P3 下面
4、P4 側面
5、P5 取付孔
6、P6 コーナ刃
7、P7 主切刃
8、P8 副切刃
11 ダイ
111A 孔部
111B 側面成形面
111C ダイ111の上面
112 下パンチ
112A 下面成形面
113 ピン
114 予備成形用上パンチ
114B 予備成形面
114C 傾斜面
115 最終成形用上パンチ
115A 上面成形面
O、PO インサート中心線
C1、PC1 第1のコーナ部
C2、PC2 第2のコーナ部
P 切削インサート用圧粉体
Q 成形空間
R 原料粉末
211 ダイ
211A 孔部
211B 側面成形面
211C ダイ211の上面
212 下パンチ
212A 下面成形面
213 ピン
214 予備成形用上パンチ
214B 予備成形面
214C 傾斜面
215 最終成形用上パンチ
215A 上面成形面
Claims (10)
- 切削インサートに焼結される切削インサート用圧粉体であって、上記切削インサートにおけるインサート中心線方向を向く上下面と、これら上下面の周りに配置される側面とを有し、上記上下面間のインサート中心線方向の厚さが部分的に異なる切削インサート用圧粉体の粉末成形プレス方法において、
上記切削インサート用圧粉体の上記下面を成形する下面成形面を上端面に有する下パンチを、上記切削インサート用圧粉体の上記側面を成形する側面成形面を内周面に有するダイの孔部に下方から挿入した状態で、上記下面成形面と上記側面成形面とにより形成される成形空間に上記切削インサート用圧粉体の原料粉末を充填し、
次いで、上記切削インサート用圧粉体の上面を面対称に反転した形状とは異なる形状の予備成形面を下端面に有する予備成形用上パンチを上記成形空間に上方から挿入して予備成形することにより、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が充填されるようにした上で、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有する最終成形用上パンチを上記成形空間に上方から挿入して上記原料粉末を上記切削インサート用圧粉体に粉末成形プレスすることを特徴とする切削インサート用圧粉体の粉末成形プレス方法。 - 上記予備成形用上パンチの上記予備成形面は、上記切削インサート用圧粉体における上記上下面間のインサート中心線方向の厚さが薄い部分において、上記最終成形用上パンチの上記上面成形面よりも下方への突出量が大きくされていて、
この予備成形用上パンチの挿入により、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が充填されるように予備成形することを特徴とする請求項1に記載の切削インサート用圧粉体の粉末成形プレス方法。 - 上記予備成形用上パンチの上記予備成形面には、上記切削インサート用圧粉体における上記上下面間のインサート中心線方向の厚さが薄い部分に向かうに従い下方に突出する傾斜面が形成されており、
この傾斜面によって上記原料粉末を案内することにより、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が充填されるように予備成形することを特徴とする請求項2に記載の切削インサート用圧粉体の粉末成形プレス方法。 - 切削インサートに焼結される切削インサート用圧粉体であって、上記切削インサートにおけるインサート中心線方向を向く上下面と、これら上下面の周りに配置される側面とを有し、上記上下面間のインサート中心線方向の厚さが部分的に異なる切削インサート用圧粉体の粉末成形プレス装置において、
上記切削インサート用圧粉体の上記下面を成形する下面成形面を上端面に有する下パンチと、
上記切削インサート用圧粉体の上記側面を成形する側面成形面を内周面に有して上記下パンチが下方から挿入される孔部を備えたダイと、
上記切削インサート用圧粉体の上面を面対称に反転した形状とは異なる形状の予備成形面を下端面に有して上記下面成形面と上記側面成形面とにより形成される成形空間に上方から挿入される予備成形用上パンチであって、上記成形空間に充填された上記切削インサート用圧粉体の原料粉末を、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が充填されるように予備成形するための予備成形用上パンチと、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有して上記成形空間に上方から挿入され、上記予備成形用上パンチによって予備成形されて、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多く充填された上記原料粉末を上記切削インサート用圧粉体に粉末成形プレスする最終成形用上パンチとを備えたことを特徴とする切削インサート用圧粉体の粉末成形プレス装置。 - 上記予備成形用上パンチの上記予備成形面は、上記切削インサート用圧粉体における上記上下面間のインサート中心線方向の厚さが薄い部分において、上記最終成形用上パンチの上記上面成形面よりも下方への突出量が大きいことを特徴とする請求項4に記載の切削インサート用圧粉体の粉末成形プレス装置。
- 上記予備成形用上パンチの上記予備成形面には、上記切削インサート用圧粉体における上記上下面間のインサート中心線方向の厚さが薄い部分に向かうに従い下方に突出する傾斜面が形成されていることを特徴とする請求項5に記載の切削インサート用圧粉体の粉末成形プレス装置。
- 請求項1に記載の切削インサート用圧粉体の粉末成形プレス方法であって、
上記切削インサート用圧粉体の原料粉末を充填した後、上記切削インサート用圧粉体の上面を面対称に反転した形状とは凹凸の方向が逆向きの予備成形面を下端面に有する予備成形用上パンチを上記成形空間に上方から挿入して上記原料粉末を予備成形し、
この予備成形された原料粉末の上にさらに原料粉末を再充填することにより、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が充填されるようにした上で、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有する最終成形用上パンチを上記成形空間に上方から挿入して、予備成形された上記原料粉末と再充填された上記原料粉末とを上記切削インサート用圧粉体に粉末成形プレスすることを特徴とする切削インサート用圧粉体の粉末成形プレス方法。 - 上記予備成形用上パンチの上記予備成形面には、上記切削インサート用圧粉体における上記上下面間のインサート中心線方向の厚さが薄い部分から厚い部分に向かうに従い下方に突出する傾斜面が形成されており、
この傾斜面によって先に充填された原料粉末を圧縮して、上記上下面間のインサート中心線方向の厚さが厚い部分に、この厚さが薄い部分よりも、予備成形前の状態に対して多くの上記原料粉末が再充填されるように予備成形することを特徴とする請求項7に記載の切削インサート用圧粉体の粉末成形プレス方法。 - 切削インサートに焼結される切削インサート用圧粉体であって、上記切削インサートにおけるインサート中心線方向を向く上下面と、これら上下面の周りに配置される側面とを有し、上記上下面間のインサート中心線方向の厚さが部分的に異なる切削インサート用圧粉体の粉末成形プレス装置において、
上記切削インサート用圧粉体の上記下面を成形する下面成形面を上端面に有する下パンチと、
上記切削インサート用圧粉体の上記側面を成形する側面成形面を内周面に有して上記下パンチが下方から挿入される孔部を備えたダイと、
上記切削インサート用圧粉体の上面を面対称に反転した形状とは凹凸の方向が逆向きの予備成形面を下端面に有して上記下面成形面と上記側面成形面とにより形成される成形空間に上方から挿入され、上記成形空間に充填された上記切削インサート用圧粉体の原料粉末を予備成形する予備成形用上パンチと、
上記切削インサート用圧粉体の上面を成形する上面成形面を下端面に有して上記成形空間に上方から挿入され、予備成形された上記原料粉末と、この原料粉末の上に再充填された原料粉末とを上記切削インサート用圧粉体に粉末成形プレスする最終成形用上パンチとを備えたことを特徴とする切削インサート用圧粉体の粉末成形プレス装置。 - 上記予備成形用上パンチの上記予備成形面には、上記切削インサート用圧粉体における上記上下面間のインサート中心線方向の厚さが薄い部分から厚い部分に向かうに従い下方に突出する傾斜面が形成されていることを特徴とする請求項9に記載の切削インサート用圧粉体の粉末成形プレス装置。
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