JPH01299741A - Method for removing burr in core - Google Patents

Abstract

PURPOSE:To efficiently remove burr in a core by changing an injecting angle of shot blasting material in accordance with the burr in the core and injecting the shot blasting material by concentrating to the burr in the core. CONSTITUTION:A core holding hand 24 is adjusted by rotating the core holding hand 24 and changing the supporting angle for the core 12 with control of a control device 23, so that the shot blasting material injected from an injection nozzle 20 hits to the burr 12a in the core 12 at the prescribed angle. The control device 23 is beforehand programmed so that the core 12 is moved at any angle and any way in accordance with the core 12. In this way, by the apparatus assembling the device for executing three-dimensional repeating movement of a robot, etc., and the shot blasting material injecting mechanism 16, the treatment to be suitable to the burr removing method to the core 12 can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [-Field of Industrial Application] The present invention relates to a method for removing burrs from a core, and more particularly to a method for removing burrs from a core efficiently.

[Conventional technology] Sand cores, ceramic cores, etc. are used in casting operations.
When manufacturing these cores, burrs inevitably occur on the mating surfaces of the molds for various reasons.

If this burr remains and is used as a casting core,
Casting defects such as streaky scratches occur in cast products, reducing the product value.

For this reason, for example, there are methods of having the core held by a robot or the like and scraping off the burrs with a file, and Japanese Patent Application Laid-open No. 49-108692, Japanese Patent Application Publication No. 59-12381, and Japanese Patent Application Publication No. 60-72638.
As described in Japanese Patent No. 61-129255, etc., there is a method of removing burrs by spraying an abrasive material onto the core.

[Problems to be Solved by the Invention] However, the former method of removing burrs with a file has poor workability, and may be difficult to remove with a file depending on the position of the burr that has formed on the core. There is a problem.

In addition, in the latter case where the abrasive material is sprayed onto the core, the abrasive material hits the core from a nearly constant angle, so if the abrasive material has a complex shape or hole, there will be areas where the abrasive material does not hit the core, resulting in complete Some parts remain where burrs cannot be removed. Furthermore, since the abrasive material is uniformly sprayed onto the core, there is a risk of roughening the surface of the core.

The present invention has been made in view of the above points, and an object of the present invention is to provide a method for removing burrs from a core that can reliably remove burrs in a short time without roughening the surface of the core. .

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a method for removing burrs from a core by projecting an abrasive material. It is characterized by changing the angle according to the burrs on the core and projecting the abrasive material roughly and concentrating on the burrs on the core.

[Operation] In this invention, since the projection angle of the abrasive material is changed according to the burr on the core, the abrasive material is always projected toward the core regardless of the position of the burr formed on the core. Moreover, since the abrasive material is concentratedly projected onto the burrs of the core, the surface of the core is prevented from becoming rough.

[Example] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

A method for removing burrs from a core according to the present invention will be explained based on FIGS. 1 and 2.

For example, using a projection nozzle, the abrasive material is concentrated in a range of φa and projected onto the burr 2 of the core 1, as shown in FIG. The range of this φa is determined depending on the size of the burr 2 of the core 1, etc., and the flow of the abrasive material is converged within a range of about φ20 mm, for example. As a result, the abrasive material can be concentrated and projected in the range of φa, so that only the necessary portion, that is, only the burr 2 of the core 1 can be polished.

In addition, there is a second difference between the projection angle of this abrasive material and the cleaning ability.
It was found that there is a relationship as shown in the figure.

For example, if the surface 1a of the core 1 is projected at an angle less than a predetermined angle, the desired cleaning ability for the surface 1a of the core 1 cannot be obtained. The cleaning ability occurs at an angle of approximately 30° or more, for example, and reaches its maximum at approximately 90'. The predetermined angle at which this cleaning ability cannot be obtained is also determined by the hardness of the core 1 and the like. Therefore, the projection angle of the abrasive material is set at a predetermined angle, for example, approximately 30° to 9°.
It is preferable to set it in the range of 0°.

Further, the cleaning ability can be made variable by adjusting the wind speed of air ejected from the projection nozzle, for example.

This polishing ability is set by taking into consideration the general burr occurrence state of the core 1.

The burr 2 of the core 1 has the following characteristics. That is, when manufacturing a core mold, the parting line is generally taken in the normal direction, as shown in FIG. Therefore,
The burr 2 generated on the parting line S naturally occurs in the normal direction.

For example, if the abrasive material is projected onto the core 1 at a projection angle of around 30°, the projection angle to the burr 2 will be 90°.
-30''-60°, which is a range with sufficient cleaning ability, and only the burr 2 can be removed without roughening the surface 1a of the core 1.

Next, a burr removing device that enables the core burr removal method of the present invention will be described with reference to FIGS. 3 to 5.

FIG. 3 is a schematic view of the core burr removal device, FIG. 4 is a sectional view of the abrasive material projection mechanism, and FIG. 5 is a front view of the core holding hand.

In FIG. 3, reference numeral 11 denotes a projection cabinet for projecting the abrasive material, and a storage packet 13 for storing the core 12 is arranged adjacent to this projection cabinet 11.
A robot 14 is arranged to hold the core 12 at an arbitrary position.

Inside the projection cabinet 11, an abrasive material tank 15 for storing abrasive material is provided at an upper position, and an abrasive material projection mechanism 16 is provided below this abrasive material tank 15.

This abrasive material projection mechanism 16 is constructed as shown in FIG. The nozzle body 17 of the abrasive material projection mechanism 16 is attached to the abrasive material tank 15, and the abrasive material is supplied from the abrasive material tank 15. As this abrasive material, for example, a plastic abrasive material, granular material, etc. can be used.

A primary air nozzle 18 is provided inside the nozzle body 1, and primary air is supplied from the secondary air passage 18a to the hollow passage 17a.
The abrasive material is guided to the center of the air and the abrasive material is projected by this air.

In addition, a secondary air nozzle 19 is installed at the tip of the nozzle body 17.
is screwed onto this secondary air nozzle 19, and a projection nozzle 2 is attached to this secondary air nozzle 19.
0 is screwed on.

A projection passage 20a is formed in the projection nozzle 20 in the axial direction and communicates with the hollow passage 17a of the nozzle body 17, and projects the abrasive material supplied from the abrasive material tank 15. A secondary air passage 19a is formed in the secondary air nozzle 19. This secondary air passage 19a is formed between the inner surface of the secondary air nozzle 19 and the outer surface of the projection nozzle 20, and projects the secondary air downward along the outer surface of the projection nozzle 20. The abrasive material projected from the 20 projection passages 20a is concentrated and prevented from scattering to the outside.

A guide stand 21 is provided at the bottom of the projection cabinet 11, and the burrs and abrasive material removed by the guide stand 21 are collected at a predetermined location. The abrasive material thus collected is collected by a collection packet conveyor 22.

For example, a six-axis articulated robot is used as the robot 14,
The control device 23 causes the core holding hand 24 to take out the core 12 from the storage packet 13. As shown in FIG. The upper core 12 is gripped by the grip portions 26 and 27, and the lower core 12 is gripped by the grip portions 28 and 29.

The core holding hand 24 is controlled by the control device 23 to rotate the core holding hand 24 and hold the core 1.
By changing the support angle of 2, the abrasive material projected from the projection nozzle 20 is adjusted so as to hit the burr 12a of the core 12 at a predetermined angle.

The control device 23 is configured to control the core 12 according to the core 12.
What angle and how to move it are pre-programmed.

In this way, a device that combines a device capable of three-dimensional repetitive motion, such as the robot 14, and the abrasive material projection mechanism 16 makes it possible to process the core 12 in accordance with the burr removal method. .

Therefore, the abrasive material can be projected only to the areas where the abrasive material is needed. Further, since the abrasive material can be projected at a projection angle suitable for deburring, it is possible to remove burrs without roughening the surface of the core 12. Furthermore, since the process does not involve direct contact with a file, etc., it can be easily processed using a robot or the like. Further, by adjusting the air volume according to the state of burr generation on the core, the cleaning force can be adjusted freely.

[Effects of the Invention] As explained above, according to the method of the present invention, the projection angle of the abrasive material is changed according to the burrs on the core, and the projection angle is concentrated on the burrs on the core. Regardless of the position of the burr on the core, it is always projected towards the core, reducing the areas that are not hit by the abrasive material even if there are complex shapes or holes, completely removing burrs. be able to.

Furthermore, since the abrasive material is concentratedly projected onto the burrs of the core, the surface of the core is prevented from becoming rough when the burrs are removed.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a method for removing burrs from a core according to the present invention, Fig. 2 is a diagram showing the projection angle of the abrasive material, Fig. 3 is a schematic diagram of a device for removing burrs from a core, and Fig. 4 5 is a sectional view of the abrasive material projection mechanism, and FIG. 5 is a front view of the core holding hand. In the figure, numeral 1 is a core, 2 is a burr, 14 is a robot, and 16 is an abrasive material projection mechanism. Figure 4 Figure 5

Claims (1)

[Claims] In a core burr removal method in which burrs are removed from the core by projecting an abrasive material, the projection angle of the abrasive material is changed according to the burrs on the core, and the abrasive material is further applied to the core. A method for removing burrs from a core, which is characterized by concentrating projection onto the burrs.