JP2832652B2 - Finishing equipment for mold surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finishing apparatus for finishing a die surface by shot blasting.

[0002]

2. Description of the Related Art In a conventional mold, after roughing into a desired shape by cutting with a ball mill or an end mill or the like, the protrusions formed during the cutting are removed and the surface roughness is improved. Therefore, the surface is polished and finished by hand. However, since the manual finishing requires a large number of steps, automation of the finishing is desired.

[0003] On the other hand, shot blasting in which fine powder is sprayed on the surface of a workpiece to finish the surface is conventionally known.

[0004]

It is conceivable that the above shot blast is applied to the finishing step of the above-mentioned mold. Due to the large difference in the size of
In shot blasting using a relatively small particle size powder that is effective for improving the surface roughness, projections due to uncut portions are not removed, while a relatively large particle size powder that is effective for removing the projections is used. Shot blasting cannot improve surface roughness. In addition, after performing shot blasting with a powder having a small particle diameter to improve the surface roughness, and then performing shot blasting with the powder having a large particle diameter in the next step, a large particle diameter is applied to the surface having the improved surface roughness. Indentations due to dents in the powder particles having a large diameter are formed. Conversely, if shot blasting is performed first with powder having a large particle diameter, the dents of the powder particles having the large particle diameter are converted into small particles in the next step. Any of them cannot be adopted because they cannot be removed by shot blasting with the powder of

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a die surface finishing apparatus capable of improving the surface roughness of a die surface and removing protrusions due to uncut portions. .

[0006]

In order to achieve the above object, the present invention provides an apparatus for finishing a die surface after a cutting process, wherein the first surface comprising a relatively small particle with respect to the die surface. A first injection means for injecting powder; and a second injection means for injecting second powder comprising relatively large-diameter particles, wherein the mold surface of the second powder particles injected by the second injection means is provided. When reaching the first injection means, the injection timing control means for controlling the injection timing of the first and second injection means so that the first powder particles injected from the first injection means have already adhered to the mold surface. It is characterized by having been provided.

[0007]

In the mold surface, the first powder does not adhere to the projecting portion of the mold surface but adheres to a flat portion other than the projecting portion, so that when the second powder reaches the mold surface, By controlling the injection timing such that the first powder has already reached and adhered to the mold surface, the first powder becomes a cushion in a flat portion where the first powder is adhered, and the second powder is used. The formation of dents is prevented, while the projections on which the first powder is not adhered are directly colliding with the second powder to remove the projections.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 is a shot blast booth,
FIG. 1 shows a state in which the mold 3 placed on the conveyor 2 has been moved into the booth 1. Before the mold 3 is carried into the booth 1, it is processed into a predetermined shape by a cutting process using a ball mill, an end mill, or the like. Incidentally, a first nozzle 41 and a second nozzle 51 are arranged in the booth 1, and the first nozzle 41 sprays the first powder supplied from the first injection device 42 onto the surface of the mold 3. The second nozzle 51 is configured as follows.
The second powder supplied from the injection device 52 is configured to be sprayed on the surface of the mold 3.

A tray 61 is set in the booth 1, and the first nozzle 41 and the second nozzle 51 are provided.
The respective powders ejected from the tray 61 are collected by the tray 61 and sent to the powder separating device 6. The powder separating device 6 separates the powder sent from the tray 61 into a first powder and a second powder, and transfers the first powder to the first injection device 42 and the second powder to the second injection device 52. Send each one. And the first
The injection device 42 and the second injection device 52 are connected to the controller 7 and are configured to supply each powder to each of the nozzles 41 and 51 according to a control signal from the controller 7. The controller 7 is composed of a microcomputer, and the first injection device 42 and the second injection device 52 are configured such that the first powder and the second powder are injected onto the surface of the mold 3 at a predetermined injection timing. Control.

Next, the injection timing control of the controller 7 will be described. When the second powder reaches the surface of the mold 3, the first powder must have already reached and adhered to the surface of the mold 3. Injection must have been started. Therefore, in this embodiment, the shot blasting with the second powder is performed immediately after the shot blasting with the first powder. This step will be described with reference to FIGS.

As shown in FIG. 2, a projection 31 is formed on the surface of the mold 3 as an uncut portion during the cutting. When shot blasting with the first powder is performed on the surface in this state, the particles 4a of the first powder adhere to the flat portion other than the protrusion 31 as shown in FIG. 3, but do not adhere to the rising surface or the top of the protrusion 31. . When shot blasting with the second powder is continuously performed in this state, as shown in FIG. 4, the projections 31 directly collide with the particles 5a of the second powder, so that the projections 31 are removed by the particles 5a. become. On the other hand, in the flat portion where the particles 4a are attached,
a acts as a cushion for the particles 5a,
Since the collision force of a is dispersed and relaxed, almost no dent is formed on the flat portion. Then, when the first powder and the second powder are removed after the end of the shot blasting with the second powder, a finished surface having the shape shown in FIG. 5 is obtained.

By the way, WA # 800 is used as the first powder.
(Material: white alumina, particle size 25 μm, specific gravity 3.
8), PP beads (material: polypropylene, particle size 4 mm, specific gravity 1.2) are used as the second powder, and the surface roughness including projections is 20 μm (Rmax) and the friction coefficient is As a result of finishing the mold surface of 0.6, the surface roughness was 10 μm (Rmax) and the friction coefficient was 0.1 μm.
3 finished surfaces could be obtained.

In the above embodiment, the shot blasting with the second powder is performed after the end of the shot blasting with the first powder. However, if at least the shot blasting with the first powder is started prior to the shot blasting with the second powder, Even if the shot blasting with the second powder is started during the shot blasting with the first powder, the same effect as in the above embodiment can be obtained because the particles 4a of the first powder have already reached and adhered to the mold surface. it can.

[0014]

As is apparent from the above description, the present invention improves the surface roughness of the mold surface by shot blasting and removes protrusions due to uncut portions, so that the surface of the mold after cutting is removed. Automated finishing can greatly improve productivity.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a state of a mold surface before finishing.

FIG. 3 is a view showing a state of a mold surface immediately after the end of shot blasting with a first powder.

FIG. 4 is a view showing a state of a mold surface immediately after the end of shot blasting with a second powder.

FIG. 5 is a view showing a state of a mold surface after finishing processing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Booth 3 Mold 6 Powder separation device 7 Controller 31 Projection 42 First injection device 52 Second injection device 4a Particles of first powder 5a Particles of second powder

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroya Miyaoka 1-10-1, Shinsayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (56) References JP-A-4-19070 (JP, A) JP-A-4-75824 (JP, A) JP-A-3-213270 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B24C 3/12 B24C 7/00

Claims (1)

(57) [Claims] 1. An apparatus for finishing a die surface after cutting, comprising: a first injection means for injecting a first powder composed of relatively small-diameter particles onto the die surface; A second injection means for injecting a second powder of particles, wherein the second powder particles injected by the second injection means reach the mold surface when the second powder particles are injected from the first injection means. An apparatus for finishing a die surface, comprising: injection timing control means for controlling the injection timing of the first and second injection means so that one powder particle has already adhered to the die surface.