CN205437136U

CN205437136U - Powder metallurgy plug

Info

Publication number: CN205437136U
Application number: CN201521004830.8U
Authority: CN
Inventors: 朱普业
Original assignee: Bi Dream Technology (shanghai) Composite Material Co Ltd
Current assignee: Bi Dream Technology (shanghai) Composite Material Co Ltd
Priority date: 2015-12-04
Filing date: 2015-12-04
Publication date: 2016-08-10
Anticipated expiration: 2025-12-04

Abstract

The utility model belongs to the technical field of powder metallurgy die, a powder metallurgy plug is related to, include the core of claviform base, tube -shape and incite somebody to action the core is fixed in the screw of base front end, the base is coaxial with the core, the external diameter of core with the external diameter of base front end equals. The utility model discloses the plug adopts split type design, has prolonged life, has saved the maintenance cost, has avoided the poor problem of precision.

Description

A kind of powder metallurgy plug

Technical field

This utility model relates to powder metallurgy die technical field, particularly to a kind of split type powder metallurgy plug.

Background technology

In the production process of powder metallurgy product, in order to make product reach high dimensional accuracy, it will usually carry out shaping after product sinters.High goods are required for endoporus, when shaping in order to improve inner hole precision, it is necessary to internal diameter carrying out finishing, but the plug that common iron does weares and teares when shaping bigger, the life-span is low, and product size stability is bad simultaneously.Plug entire body mould steel makes the most relatively costly, does not meets enterprise and pursues the principle of cost savings.

Therefore, it is necessary to provide a kind of new powder metallurgy mould lamps structure to solve the problems referred to above.

Utility model content

Main purpose of the present utility model is to provide a kind of split type powder metallurgy plug.

This utility model is achieved through the following technical solutions above-mentioned purpose: a kind of powder metallurgy plug, including bar-shaped pedestal, the core of tubular and the screw that described core is fixed on described pedestal front end, described pedestal is coaxial with core, and the external diameter of described core is equal with the external diameter of described pedestal front end.

Concrete, described screw has threaded portion, internal diameter 5 ± 2.5 μm bigger than the maximum outside diameter of described threaded portion of described core.

Further, described screw also has the head being wider than described threaded portion, and described head maximum outside diameter is equal to the external diameter of described core and toward reducing away from described core directional smoothing.

Further, being provided with the transition part of cone-shaped between described threaded portion and head, described transition part is coarser than near head side near side, threaded portion, and the front end of described core is provided with the fillet surface coordinating described transition part.

Further, the outer wall of described pedestal is provided with a pair and rises as high as the banks.

Using technique scheme, technical solutions of the utility model provide the benefit that:

1, this utility model plug uses split-type design, extends service life, saves maintenance cost, it is to avoid low precision problem；

2, the threaded portion of screw and the internal diameter of core are compact, improve axiality and avoid core to ftracture；

3, head construction has guide effect, can prevent from hitting mould；

4, with the cooperation of fillet surface, transition part can ensure that screw is coaxial with core；

5, rise as high as the banks provide spanner borrow force, facilitate screw tightening.

Accompanying drawing explanation

Fig. 1 is the main sectional view of this utility model a kind of powder metallurgy plug；

Fig. 2 is the A-A profile in Fig. 1；

Fig. 3 is the half sectional view of core；

Fig. 4 is the front view of screw.

In figure, numeral represents:

1-pedestal, 11-rises as high as the banks；

2-core, 21-fillet surface；

3-screw, 31-threaded portion, 32-head, 33-transition part.

Detailed description of the invention

Below in conjunction with specific embodiment, this utility model is described in further detail.

As shown in Figures 1 to 4, a kind of powder metallurgy plug, including bar-shaped pedestal 1, the core 2 of tubular and the screw 3 that core 2 is fixed on pedestal 1 front end, pedestal 1 is coaxial with core 2, and the external diameter of core 2 is equal with the external diameter of pedestal 1 front end.During work, what plug played a major role is core 2, and therefore this part of core 2 can be cast by the mould steel that service life is longer, and remainder common iron casts.Scrapping after core 2 loss does not reaches use standard to dimensional stability, need that replaces also to only have this part of core 2, this split-type design saves maintenance cost.Owing to core 2 is equal with the external diameter of pedestal 1 front end, so mould also defines the position of core 2 while guiding pedestal 1, it is to avoid the low precision problem that split-type design may be brought.

Shown in as shown in Figure 1, Figure 3 and Figure 4, screw 3 has threaded portion 31, internal diameter 5 ± 2.5 μm bigger than the maximum outside diameter of threaded portion 31 of core 2.So not having the biggest space between threaded portion 31 and core 2, in installation, the axiality between core 2 with pedestal 1 can compare high, it is possible to avoids core 2 to deflect too many and bring and hit mould risk, is also avoided that core 2 stress ftractures.

As shown in Figure 1 and Figure 4, screw 3 also has the head 32 being wider than threaded portion 31, and head 32 maximum outside diameter is equal to the external diameter of core 2 and toward reducing away from core 2 directional smoothing.This structure of head 32 has guide effect, owing to head 32 is pre-small post-large, so the head 32 meeting automatic alignment when plug inserts mould, it is to avoid small deviation causes hitting mould.

As shown in Figure 1 and Figure 4, being provided with the transition part 33 of cone-shaped between threaded portion 31 and head 32, transition part 33 is coarser than near side, threaded portion 31 near head 32 side, and the front end of core 2 is provided with the fillet surface 21 coordinating transition part 33.Fillet surface 21 is a kind of inner conical surface structure, and after screw 3 is tightened, the transition part 33 of cone-shaped can be fitted with the fillet surface 21 of core 2, and such screw 3 also ensures that coaxial with core 2.

As in figure 2 it is shown, the outer wall of pedestal 1 is provided with a pair and rises as high as the banks 11.Owing to pedestal 1 is overall in bar-shaped, if without rising as high as the banks 11, more difficult fixed screw 3 when clamping pedestal 1, if misoperation, the most then produce sliding tooth, weight then damages pedestal 1 profile, affects pedestal 1 function.Rise as high as the banks 11 provide the instruments such as spanner borrow force, facilitate screw 3 to tighten.

Above-described is only embodiments more of the present utility model.For the person of ordinary skill of the art, on the premise of creating design without departing from this utility model, it is also possible to making some deformation and improvement, these broadly fall into protection domain of the present utility model.

Claims

1. a powder metallurgy plug, it is characterised in that: including bar-shaped pedestal, the core of tubular and described core is fixed on the screw of described pedestal front end, described pedestal is coaxial with core, and the external diameter of described core is equal with the external diameter of described pedestal front end.

A kind of powder metallurgy plug the most according to claim 1, it is characterised in that: described screw has threaded portion, internal diameter 5 ± 2.5 μm bigger than the maximum outside diameter of described threaded portion of described core.

A kind of powder metallurgy plug the most according to claim 2, it is characterised in that: described screw also has the head being wider than described threaded portion, and described head maximum outside diameter is equal to the external diameter of described core and toward reducing away from described core directional smoothing.

A kind of powder metallurgy plug the most according to claim 3, it is characterized in that: between described threaded portion and head, be provided with the transition part of cone-shaped, described transition part is coarser than near head side near side, threaded portion, and the front end of described core is provided with the fillet surface coordinating described transition part.

5. according to the arbitrary described a kind of powder metallurgy plug of claim 1-4, it is characterised in that: the outer wall of described pedestal is provided with a pair and rises as high as the banks.