CN102049473A - Novel sand core and preparation method thereof - Google Patents

Abstract

The invention discloses a novel sand core and a preparation method thereof. A chilling block is arranged inside the sand core near to the outer surface of the sand core. The preparation method of the novel sand core comprises the steps as follows: a, drilling two small holes with diameters of 3 to 5mm on the chilling block; b, arranging two pins, with a length 3 to 6mm greater than the depth of the small holes, on a core box corresponding to the small holes on the chilling block; c, sleeving the chilling block on the pins of the core box through the two small holes; and d, closing an upper core box and a lower core box to produce the sand core. The novel sand core provided by the invention adopts the structure that the chilling block is wrapped by the core sand completely, so as to play a cast piece chilling role, and avoid direct contact between the chilling block and the cast piece, thereby achieving good product appearance quality and convenience in operation, and eliminating the chilling block and sand core surface repatching work. Besides, the sand core is one-step formed in the cast piece production, so that one more operator is not needed to place the chilling block on the outer surface of the sand core.

Description

A kind of novel core and preparation method thereof

Technical field

The present invention relates to chill method for placing in the casting process, relate in particular to a kind of novel core and preparation method thereof.

Technical background

In recent years, along with developing rapidly of Chinese Automobile Industry ', the consumer was more and more higher to the requirement of automotive performance, and then required more and more higher to the structure of parts, performance, quality etc.

The manufacturing technology of various foundry goods such as turbocharger obtains tremendous development just under this overall background, especially turbocharger more and more is applied on the Hyundai Motor engine as a kind of energy-efficient novel product, but this product structure complexity, size, performances etc. require very strict, the metallographic matrix of product various piece all will reach quality requirement, therefore need to impel its inner zero defect to Quench is carried out in thick big position, part, the outward appearance high conformity, and traditional way is directly chill to be placed on the mating surface that the core surface needs to repair chill and core, placing the back chill directly contacts with cast(ing) surface, cause being prone to pore by the Quench face, defectives such as dross, place insecure as chill, also cause dimension overproof easily, obvious this production technology has a lot of weak points, and the product of producing can not satisfy quality requirement.

Summary of the invention

The present invention is intended to overcome the deficiency that above prior art exists, and the novel core that provides a kind of inside to be placed with chill is to overcome the defective that is prone to pore, dross in the prior art by the Quench face.

Another object of the present invention provides a kind of method of making described novel core.

Technical solution problem of the present invention adopts following technical scheme:

A kind of novel core is provided with chill in core inside near the core outer surface.

Further, the preparation method of described novel core comprises the steps:

A, will be on the chill bore two diameter 3-5mm apertures;

B, with the chill aperture is corresponding two pins are set on core box, the length of pin is than the big 3～6mm of the degree of depth of aperture;

C, chill is placed on the pin on the core box by two apertures;

D, will go up core box and following core box matched moulds making core.

Further, described core is for making the core of turbocharger housing.

Beneficial effect of the present invention is as follows: chill is positioned over the core the inside, wrap up by core sand fully, so both can play the effect of Quench foundry goods, can avoid chill directly to contact with foundry goods again, the product appearance quality is good, more convenient operation, also can remove the work of repairing chill and core surface simultaneously from, and core one-shot forming when carrying out castings production, do not need to arrange in addition again operating personnel to place chill at the core outer surface, can save an operative employee.

The specific embodiment

Embodiment 1

A kind of novel core is provided with chill in core inside near the core outer surface.

The preparation method of described novel core comprises the steps:

A, will be on the chill bore two diameter 4mm apertures;

B, with the chill aperture is corresponding two pins are set on core box, the length of pin is than the big 4mm of the degree of depth of aperture;

C, chill is placed on the pin on the core box by two apertures;

D, will go up core box and following core box matched moulds making core.

This novel core is particularly useful for making the core of turbocharger housing.

Claims (3)

1. a novel core is characterized in that: be provided with chill in core inside near the core outer surface.

2. the preparation method of novel core according to claim 1 is characterized in that, comprises the steps:

A, will be on the chill bore two diameter 3-5mm apertures;

B, with the chill aperture is corresponding two pins are set on core box, the length of pin is than the big 3～6mm of the degree of depth of aperture;

C, chill is placed on the pin on the core box by two apertures;

D, will go up core box and following core box matched moulds making core.

3. novel core according to claim 1 is characterized in that: described core is for making the core of turbocharger housing.