CN212384533U - Novel die head suitable for producing small parts - Google Patents

Abstract

The utility model relates to a be fit for producing novel die head of small-size part, including the pouring basin, the below of pouring basin is provided with waters and waters down, it is the watering that can form the closed figure with watering down to go up to water, the pouring basin passes through the muscle and waters on with and is connected, it is fixed to go up to water and water down between connecting through at least one fixed sprue, the concave constant head tank that is equipped with in surface of going up to water, the concave constant head tank that is equipped with down of surface of watering down, go up the constant head tank and have the activity sprue with swing joint down between the constant head tank, in fixed sprue, surface and activity sprue, the surface is respectively along the two rows of wax wares of sprue axial vertical fixation have the symmetry. The utility model provides a die head at the cracked difficult problem of swing or rotatory in-process die head to die head through improving after has effectively improved the production efficiency of part.

Description

Novel die head suitable for producing small parts

Technical Field

The utility model relates to a casting equipment technical field, concretely relates to novel die head that is fit for producing small-size part.

Background

The die is a wax pattern used in investment casting to form a gating system and generally includes portions such as a sprue cup, a runner and a sprue. In production, wax pieces are needed to be adhered to the die head, and for small and large-scale casting parts, a plurality of wax pieces are generally made into wax die groups, and then the wax die groups and the die head are adhered and fixed.

Investment casting produces many small parts, less than 1 gram, and typically prepares generic dies with varying thickness and size, depending primarily on thickness, which product fits which die. Wax pieces of different parts can be matched to corresponding dies through technical analysis. If the small part uses the same die as the medium and large parts, the small part yield will be calculated to be significantly lower than the medium and large parts, process yield = part weight/(part weight + weight of the runner system). The 304 stainless steel part shown in fig. 1 is only 2 grams and the following representative universal die was used for practical production. In the figure, 178 parts are assembled and welded, the net weight of the parts is 256 g, the weight of a die head is 3716 g, each gate is 1 g, and the process yield is =256/(256+3716+178) = 6.17%.

The process yield is low because the thickness of the vertical rod of the die head is too large, and the process yield can be improved by reducing the thickness of the vertical rod of the die head in theoretical calculation of the process. However, dies with small thickness will break during oscillation or rotation due to excessive bending stresses. Therefore, if the current common plane frame type die head is used, the process yield cannot be improved by reducing the thickness of the vertical rod of the die head.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's not enough, provide a novel die head that is fit for producing small-size part, solved the cracked difficult problem of die head, improved the production efficiency of part.

The utility model discloses a realize through following technical scheme:

the utility model provides a be fit for producing novel die head of small-size part, including the pouring basin, the below of pouring basin is provided with and waters and down, it is the watering that can form closed figure with watering down to go up to water, the pouring basin passes through the muscle and waters on with and is connected, it is fixed to go up to water and water down between connecting through at least one fixed sprue, the concave constant head tank that is equipped with in surface of going up to water, the concave constant head tank that is equipped with in surface of watering down, go up the constant head tank and water down swing joint has the activity sprue between the constant head tank, fixed sprue in, surface and activity sprue in, the surface is respectively along the two rows of wax wares of sprue axial vertical fixation with the symmetry.

This scheme is enclosed to establish at last watering and pouring down between through setting up the sprue, and the bottom of activity sprue and fixed sprue is connected through pouring down and is fixed when handheld pouring cup position swing or rotatory die head, though the montant position also can be crooked under the action of gravity, but the upper and lower both ends of sprue form a mutual support's whole in top and bottom, receive crooked cross sectional area obvious increase like this, can guarantee that the die head can not break.

Further, the closed figure is one of a circular ring shape or a polygon shape.

Preferably, the upper runner and the lower runner are the same in size and are arranged to face each other.

Preferably, the die frame formed by the pouring cup, the upper pouring channel, the lower pouring channel and the fixed straight pouring channel is integrally formed by pressing.

Through the die head frame with pouring basin, runner, lower runner and fixed sprue formation, utilize the mould suppression to form, be convenient for earlier carry out the wax spare bonding fixedly at the inside and outside surface of fixed sprue, then at the installation activity sprue, convenient construction.

Furthermore, after the movable sprue is connected with the upper sprue and the lower sprue, two ends of the movable sprue are respectively fixed with the upper positioning groove and the lower positioning groove through adhesives.

The movable sprue is fixed by the adhesive, so that the connection stability is ensured.

Preferably, the movable sprue and the wax member form a die set and are integrally press-molded.

The movable sprue and the wax piece forming module can be directly pressed out through the die, namely the whole formed by combining the vertical rod and the wax piece is pressed out, so that the wax piece does not need to be separately assembled and welded, and the module formed by the single vertical rod only needs to be bonded to the die, so that the efficiency is further improved.

The utility model has the advantages that:

the utility model discloses a novel die head's characteristics are that the sprue is the circumference form and distributes, and the top of sprue are fixed through pouring water and pouring down respectively, form a whole that supports each other, when swing or rotary die head, though the sprue also can be crooked under the action of gravity, but receive crooked cross-section like this and just become the area pi x diameter of whole drum excircle and divide 4, receive crooked sectional area obvious increase like this, be original 27 times through calculating, just so can guarantee that the die head can not break.

The advantages of such a die are shown after the problems of die breakage are solved by the above analysis.

Because the thickness of the sprue of the die head can be reduced, the weight ratio of parts to the sprue is improved, and the process yield is improved. Through calculation, the process yield of the 6M gasket produced by the novel die head reaches 19.96 percent, which is 3.2 times of the original yield.

The fixed sprue and the movable sprue on the die head are distributed in a circumferential manner, the number of the sprue of the die head is increased in the same space, and when the number of the parts of each vertical rod is increased to 20 rods from 5 rods, the number of the parts of each module is 4 times that of the original module, and the production efficiency is 4 times that of the original module.

Can be cut using a small cutting machine. The two ends of the sprue are cut off, a group of parts which are connected together through the sprue are scattered, and the parts can be cut by using special small-sized machines without using large-sized cutting machines, so that the production cost is reduced.

Drawings

FIG. 1 is a representative general purpose die of the background art;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a perspective view of FIG. 2;

FIG. 4 is a schematic structural diagram of a die frame according to the present invention;

FIG. 5 is a perspective view of FIG. 4;

FIG. 6 is a schematic structural view of a movable sprue bonding wax piece according to the present invention;

fig. 7 is a schematic structural view of the adhesive wax member of the present invention when used.

Shown in the figure:

1. pouring cup, 2, rib, 3, upper pouring gate, 4, lower pouring gate, 5, movable straight pouring gate, 6, fixed straight pouring gate, 7, upper positioning groove, 8, lower positioning groove, 9, wax piece, 10.

Detailed Description

In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.

The utility model provides a be fit for producing novel die head of small-size part, includes pouring basin 1, and the below of pouring basin 1 is provided with and waters 3 and 4 down, and it is the watering that can form closed figure to water 3 and 4 down, closed figure be ring shape or polygonal one. The circular ring shape here can be a regular circular ring shape or an elliptical circular ring shape, and generally in actual production, the upper pouring channel 3 and the lower pouring channel 4 are generally circular ring shapes.

As an embodiment of the present invention, the closed figure is a perfect circle. The upper pouring channel 3 and the lower pouring channel 4 have the same size and are opposite to the arranged circular pouring channel.

The sprue cup 1 is connected with the upper pouring gate 3 through the rib 3, the upper pouring gate 3 and the lower pouring gate 4 are fixedly connected through the three fixed straight pouring gates 6, and a die head frame formed by the sprue cup 1, the upper pouring gate 3, the lower pouring gate 4 and the fixed straight pouring gates 6 is integrally formed in a pressing mode.

The outer surface of the upper pouring gate 3 is concavely provided with an upper positioning groove 7, the outer surface of the lower pouring gate 4 is concavely provided with a lower positioning groove 8, a movable straight pouring gate 5 is movably connected between the upper positioning groove 7 and the lower positioning groove 8, and the inner surface and the outer surface of the fixed straight pouring gate 6 and the inner surface and the outer surface of the movable straight pouring gate 5 are respectively vertically fixed with two symmetrical rows of wax parts 9 along the axial direction of the straight pouring gate.

For ease of installation, the movable sprue 5 and the wax 9 are formed into a die set and are integrally press-formed into a die set. What the suppression come out is that activity sprue 5 and wax 9 group put together a whole promptly, need not assemble alone like this again and weld wax 9, only need single activity sprue 5 constitute the module bond to the die head can, further raise the efficiency, activity sprue 5 with go up runner 3 and down runner 4 be connected the back, activity sprue 5's both ends are passed through the adhesive and are fixed with last constant head tank 7 and constant head tank 8 down respectively.

The utility model discloses a use method:

and integrally pressing and molding the die head frame formed by the pouring cup 1, the upper pouring gate 3, the lower pouring gate 4 and the fixed straight pouring gate 6 by using a die, namely pressing the die head frame with the pouring cup 1, the upper pouring gate 3, the lower pouring gate 4 and the three fixed straight pouring gates 6.

The fixed wax pieces 9 are firstly bonded on the inner surface and the outer surface of the three fixed sprues 6 respectively, and the wax pieces 9 can be conveniently bonded because the space between the three fixed sprues 6 is large enough. And then, the inner and outer surfaces of the movable straight pouring channels 5 are adhered and fixed with the wax pieces 9, the two ends of the movable straight pouring channels 5 are sequentially arranged in the positioning grooves and are adhered and fixed through the adhesive, so that the assembling and welding quantity is doubled, and finally, the squirrel-cage-shaped die head is formed and is similar to a squirrel-cage-shaped die head, and the wax pieces 9 are adhered inside and outside the squirrel-cage-shaped die head.

Certainly, in order to further improve the efficiency, the single movable sprue 5 and the wax piece 9 can be directly pressed by using a mold, namely the pressed movable sprue 5 and the wax piece 9 are combined into a whole, so that the wax piece 9 does not need to be separately welded, and only the module consisting of the single movable sprue 5 needs to be adhered to the positioning grooves of the upper runner 3 and the lower runner 4.

The movable sprue 5 is later glued to the die to finally form a squirrel cage shape. The purpose of the post-bonding is to facilitate the bonding of the wax pieces 9 of the small parts to the movable sprue 5, and if the movable sprue 5 is pressed simultaneously when the die frame is pressed, it is difficult to bond the wax pieces 9 to the inside of the squirrel cage die. On the contrary, the single movable sprue 5 is convenient for adhering the wax piece 9, and can adhere 2 sides or 4 sides. After the wax 9 is bonded, the wax 9 is bonded between the upper runner 3 and the lower runner 4, and the inside of the die is provided with the wax 9.

The combined surface of the die and the wax member 9 is coated with a liquid coating material consisting of a refractory material and a binder, and then refractory sand grains are sprinkled on the coating material and then hardened into shells, and the process is repeated for a plurality of times to form a multi-layered shell. Heating the shell to melt the wax mold and flow out, roasting the shell, pouring liquid alloy into the shell, solidifying and cleaning to obtain the required casting.

Of course, the above description is not limited to the above examples, and technical features of the present invention that are not described in the present application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only used for illustrating the technical solutions of the present invention and are not intended to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments, and those skilled in the art should understand that changes, modifications, additions or substitutions made by those skilled in the art within the spirit of the present invention should also belong to the protection scope of the claims of the present invention.

Claims (6)

1. A novel die head suitable for producing small parts comprises a pouring cup and is characterized in that: the below of pouring basin is provided with and waters and down, it is the watering that can form closed figure to water and water down, the pouring basin passes through the muscle and is connected with watering, it is fixed to water and water down between through at least one fixed sprue connection, the concave constant head tank that is equipped with in surface of watering on, the concave constant head tank that is equipped with in surface of watering down, go up the constant head tank and have the activity sprue between the constant head tank down, fixed sprue in, surface and activity sprue in, the surface is respectively along the two rows of wax wares of sprue axial vertical fixation of sprue symmetry.

2. The novel die head suitable for producing small parts according to claim 1, characterized in that: the closed figure is one of a circular ring shape or a polygon shape.

3. The new die head suitable for the production of small parts according to claim 1 or 2, characterized in that: the upper pouring channel and the lower pouring channel are the same in size and are arranged oppositely.

4. The novel die head suitable for producing small parts according to claim 1, characterized in that: the die head frame formed by the sprue cup, the upper pouring channel, the lower pouring channel and the fixed straight pouring channel is integrally pressed and formed.

5. The novel die head suitable for producing small parts according to claim 1, characterized in that: after the movable sprue is connected with the upper sprue and the lower sprue, two ends of the movable sprue are respectively fixed with the upper positioning groove and the lower positioning groove through adhesives.

6. The novel die head suitable for producing small parts according to claim 1, characterized in that: the movable straight pouring gate and the wax piece form a module and the module is integrally pressed and molded.

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