CN214392342U - Extrusion die structure of powder metallurgy surface densification part - Google Patents
Extrusion die structure of powder metallurgy surface densification part Download PDFInfo
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- CN214392342U CN214392342U CN202022976972.8U CN202022976972U CN214392342U CN 214392342 U CN214392342 U CN 214392342U CN 202022976972 U CN202022976972 U CN 202022976972U CN 214392342 U CN214392342 U CN 214392342U
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Abstract
The utility model provides an extrusion die structure of powder metallurgy surface densification part which characterized in that: the extrusion die structure comprises an upper core rod and an upper punch, wherein the upper core rod comprises a cylindrical rod body, the bottom of the rod body is provided with an expanded step, a groove for the step at the bottom of the upper core rod to be placed is formed in an upper punch seat, the upper core rod is arranged in the groove through the step, a backing plate is arranged above the step and fixed with the upper punch seat, the upper punch is provided with a penetrating inner hole for the rod body of the upper core rod to penetrate through, and the upper punch is arranged on the backing plate and fixed outside the rod body of the upper core rod through a pressing ring in a clearance fit manner. The utility model has the advantages of simple and reasonable structure, make conveniently, extrude effectually, solved the part in the overproof problem of extrusion back profile degree, extrude the back part simultaneously and from the ejection of compact of bed die below, improved production efficiency.
Description
Technical Field
The utility model belongs to the technical field of powder metallurgy, a mould structure is related to, concretely relates to extrusion die structure of powder metallurgy surface densification part.
Background
Powder metallurgy is a process technology for manufacturing metal materials, composites and various types of products by using metal or metal powder as a raw material through forming and sintering, is widely applied to various fields, has unique chemical composition and mechanical and physical properties, cannot be obtained by a traditional fusion casting method, and can be used for manufacturing various powder metallurgy parts such as automobiles, motorcycles, textile machinery, electric tools, hardware tools, electric appliances and the like.
The combination of surface densification with conventional powder metallurgy methods significantly improves the fatigue and surface wear properties of the sintered part, thereby increasing the life of the part, while reducing the overall cost of producing high performance parts and providing greater potential for parts produced by powder metallurgy methods.
The extrusion die is a key device in the process of surface densification of a powder metallurgy product, and the surface densification is to improve the density of a part by radial extrusion. Therefore, the extrusion die is an important tool for ensuring the precision and performance of the article during the machining of surface densified parts.
In the structural design of a conventional powder metallurgy finishing die, a female die, a core rod, an upper punch, a lower punch and the like are included, and the core rod is designed on a lower die plate of a press and is matched with the lower punch. However, the lower opening of the female die of the extrusion die is also guided, and the fit clearance between the lower die and the lower punch is larger, so that the lower punch and the core rod cannot be effectively fixed by the female die and can radially move to influence the profile degree of the inner cavity of the part.
Therefore, there is a strong need to develop a press die structure to meet the production requirements of powder metallurgy surface densified parts.
Disclosure of Invention
The utility model aims to solve the technical problem that to foretell technical current situation and provide a simple structure, extrude the effectual extrusion die structure of powder metallurgy surface densification part to solve the problem that the part profile tolerance is out of tolerance behind the extrusion.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: the utility model provides an extrusion die structure of powder metallurgy surface densification part which characterized in that: the extrusion die structure comprises an upper core rod and an upper punch, wherein the upper core rod comprises a cylindrical rod body, the bottom of the rod body is provided with an expanded step, a groove for the step at the bottom of the upper core rod to be placed is formed in an upper punch seat, the upper core rod is arranged in the groove through the step, a backing plate is arranged above the step and fixed with the upper punch seat, the upper punch is provided with a penetrating inner hole for the rod body of the upper core rod to penetrate through, and the upper punch is arranged on the backing plate and fixed outside the rod body of the upper core rod through a pressing ring in a clearance fit manner.
As an improvement, the fit clearance between the bottom step of the upper core rod and the groove of the upper punch seat is 0.07-0.12 mm.
Further, the diameter of the base plate is larger than the diameter of the bottom of the step and the upper punch, the base plate is covered on the step surface of the upper core rod and abuts against the upper punch seat, the base plate is provided with a connecting counter bore, the upper punch seat is provided with a corresponding threaded hole, and the base plate is fixed on the upper punch seat through a screw.
Further, the upper punch comprises an installation base, a middle rod and a punch which are integrally formed, the installation base, the middle rod and the punch are cylindrical, the length of the installation base, the length of the middle rod and the punch sequentially ranges from short to long, the outer diameter of the installation base, the middle rod and the punch sequentially ranges from large to small, the upper punch is sleeved outside the rod body of the upper core rod and located above the backing plate, and the fit clearance of the upper punch, which penetrates through the inner wall of the inner hole and the rod body of the upper core rod, ranges from 0.01 mm to 0.03 mm.
And furthermore, the fit clearance between the punch of the upper punch and the inner cavity of the effective section of the female die is 0.01-0.03 mm.
Still further, an arc-shaped transition section is formed between the middle rod and the punch.
And finally, the middle part of the pressing ring is provided with a step hole matched with the mounting seat and the middle rod of the upper punch, the pressing ring is sleeved outside the middle rod of the upper punch, the peripheral surface of the pressing ring is flush with the backing plate after being pressed tightly, and the backing plate and the pressing ring are fixed on the upper punch seat through screws.
Compared with the prior art, the utility model has the advantages of: an upper core rod is arranged on the upper punch seat, and a rod body of the upper core rod is matched with an inner hole of the upper punch, so that the upper core rod is fixed, and the contour degree of an inner cavity of the extruded part is ensured to meet the requirements of a drawing. The utility model has the advantages of simple and reasonable structure, make conveniently, extrude effectually, solved the part in the overproof problem of extrusion back profile degree, extrude the back part simultaneously and from the ejection of compact of bed die below, improved production efficiency.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in figure 1, the extrusion die structure of the powder metallurgy surface densification part comprises an upper core rod 1, an upper punch seat 2 and an upper punch 3, wherein the upper core rod 1 comprises a cylindrical rod body 11, the bottom of the rod body 11 is provided with a step 12 with an expanded diameter, the middle of the upper punch seat 2 is provided with a groove for placing the step 12 at the bottom of the upper core rod 1, the upper core rod 1 is arranged in the groove through the step 12, a backing plate 4 is arranged above the step 12 and fixed with the upper punch seat 2, and the matching gap between the step 12 at the bottom of the upper core rod 1 and the groove of the upper punch seat 3 is 0.07-0.12 mm. The diameter of backing plate 4 is greater than the bottom diameter of step 12 and upper punch 3, and backing plate 4 lid is established on the step face of upper core rod 1 and is offseted with upper punch holder 2, has seted up the connecting through hole on backing plate 4, has seted up corresponding screw hole on the upper punch holder 2, fixes backing plate 4 on upper punch holder 2 through screw 7.
The upper punch 3 has a through inner hole 35 through which the rod body 11 of the upper core rod 1 is inserted, and the upper punch 3 is provided on the shim plate 4, fitted around the rod body 11 of the upper core rod 1 by clearance fit, and fixed by the pressing ring 5. The upper punch 3 has the specific structure that: the upper punch comprises an installation base 33, a middle rod 32 and a punch 31 which are integrally formed, the installation base 33, the middle rod 32 and the punch 31 are cylindrical, the length of the installation base is sequentially from short to long, the outer diameter of the installation base is sequentially from large to small, the upper punch 3 is sleeved outside a rod body 11 of the upper core rod 1 and located above the backing plate 4, and the fit clearance of the inner wall of a penetrating inner hole 35 of the upper punch 3 and the rod body 11 of the upper core rod 1 is 0.01-0.03 mm. The fit clearance between the punch 31 of the upper punch 3 and the inner cavity of the effective section of the female die 6 is 0.01-0.03 mm. An arc-shaped transition section 34 is formed between the middle rod 32 and the punch 31 of the upper punch 3. The pressing ring 5 is provided with a connecting counter bore, the middle part of the pressing ring 5 is provided with a step hole matched with the mounting seat 33 and the middle rod 32 of the upper punch 3, the pressing ring 5 is sleeved outside the middle rod 32 of the upper punch 3, the peripheral surface of the pressing ring 5 is flush with the backing plate 4 after being compressed, and the backing plate 4 and the pressing ring 5 are fixed on the upper punch seat 2 through screws.
During installation, the upper core rod 1 is installed in the upper punch seat 2, the fit clearance between the height of the step 12 of the upper core rod 1 and the groove of the upper punch seat 2 is 0.07-0.12 mm, the upper core rod 1 is covered by a backing plate 4, 1 upper punch 3 is placed on the backing plate 4, the fit clearance between the rod body 11 of the upper core rod 1 and the upper punch 3 penetrating through the inner hole 35 is 0.01-0.03 mm, the integral structure formed by the above steps is pressed by the pressing ring 5, the upper punch 3 is fixed by the pressing ring 5, and the fit clearance between the punch 31 of the upper punch 3 and the inner cavity of the effective section of the female die 6 is 0.01-0.03 mm.
Therefore, the upper core rod 1 is fixed through the matching of the rod body 11 of the upper core rod 1 and the upper punch 3 penetrating through the inner hole 35, and the contour degree of the inner cavity of the extruded part is ensured to meet the requirement of a drawing.
This embodiment simple structure is reasonable, make convenient, extrude effectually, has solved the part problem of profile tolerance super poor after the extrusion, and the ejection of compact of part below from the bed die has increased production efficiency after the extrusion simultaneously.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides an extrusion die structure of powder metallurgy surface densification part which characterized in that: the extrusion die structure comprises an upper core rod and an upper punch, wherein the upper core rod comprises a cylindrical rod body, the bottom of the rod body is provided with an expanded step, a groove for the step at the bottom of the upper core rod to be placed is formed in an upper punch seat, the upper core rod is arranged in the groove through the step, a backing plate is arranged above the step and fixed with the upper punch seat, the upper punch is provided with a penetrating inner hole for the rod body of the upper core rod to penetrate through, and the upper punch is arranged on the backing plate and fixed outside the rod body of the upper core rod through a pressing ring in a clearance fit manner.
2. The extrusion die structure of claim 1, wherein: the height of the step at the bottom of the upper core rod and the fit clearance of the groove of the upper punch seat are 0.07-0.12 mm.
3. The extrusion die structure of claim 2, wherein: the diameter of the base plate is larger than the diameters of the step and the bottom of the upper punch, the base plate cover is arranged on the step surface of the upper core rod and abuts against the upper punch seat, the base plate is provided with a connecting counter bore, the upper punch seat is provided with a corresponding threaded hole, and the base plate is fixed on the upper punch seat through a screw.
4. The extrusion die structure according to claim 1, 2 or 3, wherein: the upper punch comprises an integrally formed mounting base, a middle rod and a punch, the mounting base, the middle rod and the punch are cylindrical, the length of the mounting base, the length of the middle rod and the punch sequentially ranges from short to long, the outer diameter of the mounting base, the middle rod and the punch sequentially ranges from large to small, the upper punch is sleeved outside the upper core rod and located above the base plate, and the fit clearance of the upper punch, which penetrates through the inner wall of the inner hole, and the fit clearance of the upper punch, which penetrates through the upper core rod, is 0.01-0.03 mm.
5. The extrusion die structure of claim 4, wherein: and the fit clearance between the punch of the upper punch and the inner cavity of the effective section of the female die is 0.01-0.03 mm.
6. The extrusion die structure of claim 5, wherein: an arc-shaped transition section is formed between the middle rod and the punch.
7. The extrusion die structure of claim 6, wherein: the middle part of the pressing ring is provided with a step hole matched with the mounting seat and the middle rod of the upper punch, the pressing ring is sleeved outside the middle rod of the upper punch, the peripheral surface of the pressing ring is flush with the backing plate after being pressed tightly, and the backing plate and the pressing ring are fixed on the upper punch seat through screws.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022976972.8U CN214392342U (en) | 2020-12-08 | 2020-12-08 | Extrusion die structure of powder metallurgy surface densification part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022976972.8U CN214392342U (en) | 2020-12-08 | 2020-12-08 | Extrusion die structure of powder metallurgy surface densification part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214392342U true CN214392342U (en) | 2021-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022976972.8U Active CN214392342U (en) | 2020-12-08 | 2020-12-08 | Extrusion die structure of powder metallurgy surface densification part |
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| Country | Link |
|---|---|
| CN (1) | CN214392342U (en) |
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- 2020-12-08 CN CN202022976972.8U patent/CN214392342U/en active Active
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