CN110893462A - Pressing die of hard alloy crushing disc - Google Patents
Pressing die of hard alloy crushing disc Download PDFInfo
- Publication number
- CN110893462A CN110893462A CN201911260414.7A CN201911260414A CN110893462A CN 110893462 A CN110893462 A CN 110893462A CN 201911260414 A CN201911260414 A CN 201911260414A CN 110893462 A CN110893462 A CN 110893462A
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- China
- Prior art keywords
- lower punch
- insert
- die
- punch
- female die
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 20
- 239000000956 alloy Substances 0.000 title claims abstract description 20
- 238000003825 pressing Methods 0.000 title abstract description 25
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 229910001315 Tool steel Inorganic materials 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 9
- 239000007787 solid Substances 0.000 abstract 1
- 230000002457 bidirectional effect Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 206010066054 Dysmorphism Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Images
Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
Abstract
The invention discloses a pressing die of a hard alloy crushing disc, which is characterized in that: the die comprises an upper punch, a lower punch and a female die, wherein the female die is a tubular body, the upper punch and the lower punch are respectively positioned in the female die and are arranged in a sliding manner, and a die cavity is formed between the upper punch, the lower punch and the female die; at least four insert blocks which are independently demoulded relative to the lower punch are arranged in the lower punch, the at least four insert blocks are uniformly distributed in the lower punch in a petal shape, and at least one surface of each insert block forms a special-shaped surface of a die cavity. The invention can solve the problems of difficult demoulding and material sticking, obtains hard and solid blank products with uniform density, has high yield and has stronger practicability in production.
Description
Technical Field
The invention relates to the technical field of pressing of alloy products, in particular to a pressing die of a hard alloy crushing disc.
Background
The conventional production process of the hard alloy product comprises the steps of pressing powder of a pressing die into a pressed blank, sintering at high temperature, and forming an alloy product which is high in hardness, high in wear resistance and difficult to process. During the compaction process of the hard alloy powder compaction die, the compact must have sufficient density and strength, and the relative uniformity of the density of the compact is ensured.
When pressing alloy products, namely crushing discs and hard alloy blanks, the determination of the position of a die cavity forming area is a key part and is a very important part for forming products. The thin sheet large-area product is easy to generate the defects of crack, delamination, corner drop and the like due to uneven density, so that the product is scrapped, the production cost is increased, the labor intensity of workers is increased, and the delivery date is prolonged.
When the alloy product, namely the crushing disc and the hard alloy blank, is pressed by a traditional method, if single-side pressing is adopted, due to the characteristics of the product, the sheet is large in area, so that the density is uneven during pressing, the density of a pressed compact is too low, the sintering cannot be completely densified, the pressing cannot be finished or the defects of pressed compact layering, cracks and the like are generated when the density is too high, and the product performance requirements are not met.
By adopting bidirectional pressing, although the density is relatively uniform, the material on the contact surface cannot be demoulded after being adhered, the demoulding is forced and is easy to break, waste products are caused, and the pressed product has low qualification rate, high cost and uncontrollable production period.
Disclosure of Invention
In view of the above-mentioned existing defects, the present invention aims to provide a pressing mold for a hard alloy crushing disc, which can solve the above-mentioned deficiencies in the prior art, solve the problems of difficult demolding and material sticking, obtain a product with hardness, uniform density, high yield and strong practicability in production.
The technical scheme of the invention is as follows:
a pressing die for a hard alloy crushing disc comprises an upper punch, a lower punch and a female die, wherein the female die is a tubular body, the upper punch and the lower punch are respectively positioned in the female die and are arranged in a sliding manner, and a die cavity is formed among the upper punch, the lower punch and the female die;
at least four insert blocks which are independently demoulded relative to the lower punch are arranged in the lower punch, the at least four insert blocks are uniformly distributed in the lower punch in a petal shape, and at least one surface of each insert block forms a special-shaped surface of a die cavity.
Preferably, the insert blocks are uniformly distributed into 8-12 blocks along the lower punch in a petal shape.
Preferably, each insert is of uniform size and shape.
Specifically, the insert is a hard alloy insert or a tool steel insert.
Specifically, the upper surface of the lower punch, which is in the same direction as the irregular surface of the insert, is a plane.
Specifically, the dysmorphism face of inserting is the cambered surface that radius gradually increases from top to bottom.
Specifically, a rear pressure pad is arranged on one side of the female die close to the lower punch.
The invention has the beneficial effects that:
1. the movable insert is made in the lower punch, the petal shape of the insert forms a cambered surface of a product which is difficult to demould, the problems of difficult demoulding and material sticking are solved, the qualified rate of a pressed blank product is high, the production cost is reduced, and the production period is controllable;
2. the insert is a hard alloy insert or a tool steel insert, and has the advantages of good material performance and high precision;
3. and the back pressure pad is adopted to heighten the female die, so that the upper die punch is pre-pressed firstly, and then the back pressure pad is taken off, and then the bidirectional pressing can be carried out. The product with hardness, density and uniformity is obtained by adopting bidirectional pressing, the densification effect after sintering is good, the defects of pressed compact layering, cracks and the like are avoided, and the product performance requirement is met integrally.
Drawings
Fig. 1 is a schematic view showing a loose state of a pressing mold of a cemented carbide crushing disc according to the present invention.
Fig. 2 is a schematic view of the pressing mold of the hard alloy crushing disk of the invention in a pressing state.
Fig. 3 is a schematic diagram showing comparison before and after pressing of the pressing die of the cemented carbide crushing disc according to the present invention.
Fig. 4 is a top view of the lower punch of the present invention.
FIG. 5 is a cross-sectional view of the lower punch of the present invention.
FIG. 6 is a schematic view of an insert of the present invention.
Fig. 7 is a side view of the compact of the present invention.
Fig. 8 is a bottom view of the green compact of the present invention.
In the figure, 1-upper punch, 2-lower punch, 3-female die, 4-insert and 5-rear pressure pad.
Detailed Description
In order to explain the technical content, the achieved objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.
As shown in fig. 1-8, the pressing mold for the hard alloy crushing disc comprises an upper punch 1, a lower punch 2 and a female mold 3 for fixing the upper punch 1 and the lower punch 2, wherein the female mold 3 is a tubular body, the upper punch 1 and the lower punch 2 are respectively positioned in the female mold 3 and are arranged in a sliding manner, a mold cavity is formed between the upper punch 1, the lower punch 2 and the female mold 3, and the outer walls of the upper punch 1 and the lower punch 2 are attached to the side wall of the mold cavity of the female mold 3; 12 tool steel inserts 4 which are in the same size and shape and are independently demoulded with the lower punch 2 are arranged in the lower punch 2, the 12 inserts 4 are distributed in the lower punch 2 in a petal-shaped manner, and at least one surface of each insert 4 forms a special-shaped surface of a die cavity.
The working principle of the embodiment is as follows:
when the die is actually used, zinc stearate powder is used for respectively lubricating the inner die walls of the female die 3 of the upper punch 1 and the lower punch 2, the die is assembled according to the attached drawing 1, the female die 3 is fixed on a female die plate of a machine tool through a connecting piece, the lower punch 2 is matched with the insert 4 and then fixed on a lower floating plate on the machine tool through the connecting piece, the upper punch 1 is fixed on the upper floating plate on the machine tool through the connecting piece, and hard alloy powder is sent into an opening cavity formed by the female die 3, the lower punch 2 and the insert 4 through an automatic feeding mechanism of a press; the press simultaneously transmits the pressure of the lower punch 2 and the upper punch 1 to the metal powder for compression molding through bidirectional pressing; and (5) demolding after the pressing is finished. In the demolding, first, 12 inserts 4 are individually demolded. Due to elastic shrinkage, if the insert 4 is not arranged, the pressed blank can shrink to coat the whole lower punch 2, so that the material on the contact surface cannot be demoulded after being stuck, and the demoulding is forced and the material is easy to break, thereby causing waste. The surface of the insert 4 forms a special-shaped surface of a pressed compact die cavity and has a die drawing angle, so that the insert 4 can be smoothly demoulded without being damaged by pulling; and then the upper punch 1 and the lower punch 2 can successfully complete demoulding under the condition that the pressed compact is elastically contracted, so that a qualified product is provided for next sintering. The upper punch 1 and the female die 3 are sequentially removed, the insert 4 is manually demolded, and then the lower punch 2 is demolded to form a desired green compact as shown in fig. 7 and 8.
As a further preferable mode of the present embodiment, an upper surface of the lower punch 2, which is in the same direction as the irregularly-shaped surface of the insert 4, is a flat surface. The contact surface of the pressed compact and the die is decomposed into a plane and a special-shaped surface, the special-shaped surface can be demoulded independently, main stress is dispersed, and the lower punch 2 can be smoother during demoulding, so that the phenomenon of blocking is reduced.
As a further preferable mode of the present embodiment, as shown in fig. 6, the irregular surface of the insert 4 is a curved surface with a radius gradually increasing from top to bottom, so as to ensure that the insert 4 has a draft angle and can be smoothly demolded.
As a further preferable mode of the present embodiment, as shown in fig. 1, a rear pressure pad 5 is provided on the side of the female die 3 adjacent to the lower punch 2. The back pressure pad 5 is provided for prepressing, so that the upper punch 1 is prepressed first, and then the back pressure pad 5 is removed, and then bidirectional pressing can be performed.
By adopting the technical scheme, the insert 4 is additionally arranged in the lower punch 2, and the insert 4 is a special-shaped surface, compared with the mode that the lower punch 2 is independently arranged in the prior art, the scheme can independently demould the special-shaped surface of the pressed blank, reduces most of blocking and material sticking phenomena, effectively disperses large-area stress during demoulding, further solves the problems of difficult demoulding and material sticking, has high qualification rate of pressed blank products, reduces the production cost, has controllable production period, and better realizes the purpose of the invention.
Although the invention has been described in detail above with reference to specific embodiments, it will be apparent to one skilled in the art that modifications or improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. The utility model provides a compacting tool set of carbide crushing dish which characterized in that: the die comprises an upper punch (1), a lower punch (2) and a female die (3), wherein the female die (3) is a tubular body, the upper punch (1) and the lower punch (2) are respectively positioned in the female die (3) in a sliding manner, and a die cavity is formed among the upper punch (1), the lower punch (2) and the female die (3);
at least four inserts (4) which are used for independently demoulding relative to the lower punch (2) are arranged in the lower punch (2), the at least four inserts (4) are distributed in the lower punch (2) in a petal-shaped manner, and at least one surface of each insert (4) forms a special-shaped surface of a die cavity.
2. A compacting tool for hard metal crushing discs according to claim 1, characterised in that: the insert blocks (4) are uniformly distributed into 8-12 blocks in a petal shape on the lower punch (2).
3. A compacting tool for hard metal crushing discs according to claim 1, characterised in that: each insert (4) is consistent in size and shape.
4. A compacting tool for hard metal crushing discs according to claim 1, characterised in that: the insert (4) is a hard alloy insert or a tool steel insert.
5. A compacting tool for hard metal crushing discs according to claim 1, characterised in that: the upper surface of the lower punch (2) in the same direction with the special-shaped surface of the insert (4) is a plane.
6. A compacting tool for hard metal crushing discs according to claim 1, characterised in that: the special-shaped surface of the insert (4) is a cambered surface with the radius gradually increasing from top to bottom.
7. A compacting tool for hard metal crushing discs according to claim 1, characterised in that: and a rear pressure pad (5) is arranged on one side of the female die (3) close to the lower punch (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911260414.7A CN110893462A (en) | 2019-12-10 | 2019-12-10 | Pressing die of hard alloy crushing disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911260414.7A CN110893462A (en) | 2019-12-10 | 2019-12-10 | Pressing die of hard alloy crushing disc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110893462A true CN110893462A (en) | 2020-03-20 |
Family
ID=69787265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911260414.7A Pending CN110893462A (en) | 2019-12-10 | 2019-12-10 | Pressing die of hard alloy crushing disc |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110893462A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000084945A (en) * | 1998-09-11 | 2000-03-28 | Ricoh Co Ltd | Plastic molding and method for molding it |
| CN201721044U (en) * | 2010-05-26 | 2011-01-26 | 孙婷婷 | One-step forming equipment of molding grating |
| CN102847941A (en) * | 2012-10-09 | 2013-01-02 | 苏州新锐合金工具股份有限公司 | Die for detachable compression-molding hard alloy plate and manufacturing method of die |
| CN203170968U (en) * | 2013-02-05 | 2013-09-04 | 江西稀有稀土金属钨业集团有限公司 | Die used for manufacturing hard alloy molding pressed blank with double inclined holes in pressing mode |
| CN108296453A (en) * | 2017-12-19 | 2018-07-20 | 六和轻合金（昆山）有限公司 | A kind of aluminium alloy wheel hub core pulling casting mould and its technique |
| CN208052559U (en) * | 2018-01-18 | 2018-11-06 | 东莞市中和包装材料有限公司 | A kind of abnormity plastic uptake shaping dies |
| CN211680003U (en) * | 2019-12-10 | 2020-10-16 | 广西梧州港德硬质合金制造有限公司 | Pressing die of hard alloy crushing disc |
-
2019
- 2019-12-10 CN CN201911260414.7A patent/CN110893462A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000084945A (en) * | 1998-09-11 | 2000-03-28 | Ricoh Co Ltd | Plastic molding and method for molding it |
| CN201721044U (en) * | 2010-05-26 | 2011-01-26 | 孙婷婷 | One-step forming equipment of molding grating |
| CN102847941A (en) * | 2012-10-09 | 2013-01-02 | 苏州新锐合金工具股份有限公司 | Die for detachable compression-molding hard alloy plate and manufacturing method of die |
| CN203170968U (en) * | 2013-02-05 | 2013-09-04 | 江西稀有稀土金属钨业集团有限公司 | Die used for manufacturing hard alloy molding pressed blank with double inclined holes in pressing mode |
| CN108296453A (en) * | 2017-12-19 | 2018-07-20 | 六和轻合金（昆山）有限公司 | A kind of aluminium alloy wheel hub core pulling casting mould and its technique |
| CN208052559U (en) * | 2018-01-18 | 2018-11-06 | 东莞市中和包装材料有限公司 | A kind of abnormity plastic uptake shaping dies |
| CN211680003U (en) * | 2019-12-10 | 2020-10-16 | 广西梧州港德硬质合金制造有限公司 | Pressing die of hard alloy crushing disc |
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