CN100515616C - Dies for high-speed impact pressing technology - Google Patents

Abstract

The present invention is mold for high speed impact pressing to produce high density sintered metal product and for finishing or re-pressing sintered metal product. The mold has structure includes an upper mold plate, a female mold plate, a guide pillar, a guide sleeve, an upper stamping, an impact block, an upper mold guide unit, a female mold and a lower stamping assembled together.

Description

Dies for high-speed impact pressing technology

technical field

The mold applicable to the high-speed impact pressing technology of the present invention relates to a mold suitable for producing high-density powder metallurgy products by adopting the high-speed impact pressing technology, and is also suitable for finishing or re-pressing the powder metallurgy products.

Background technique

At present, the high-speed impact pressing and re-pressing process, as a new technology for producing high-density powder metallurgy products, has been used in experiments and production in some foreign and domestic scientific research institutions and enterprises. Since the instantaneous speed of the punch used to press the powder during high-speed impact pressing is between 10m/s and 30m/s, it is more than 200 times faster than the speed of the traditional pressing method; The huge impact force means that the powder is pressed into shape in a very short time. This phenomenon is called "adiabatic softening" abroad. The advantage of this pressing process is that the compressibility of the powder can be improved to obtain a higher product density, the density distribution of the product is uniform and the required demoulding force is small. While the upper punch exerts pressure on the powder, it is also subjected to the reaction force of the powder, especially at the moment when the powder is pressed and formed, the powder has become a green product with a certain density and strength. The reaction force produced by it on the upper punching device is enough to make the upper punching device move in the opposite direction at a certain speed. Therefore, during high-speed impact pressing, the upper punch device is likely to pop up and break away from the mold holding device, and collide with other moving or non-moving parts on the press or the mold frame, resulting in damage to the mold and sometimes causing a press. failure of the machine or formwork.

Contents of the invention

The object of the present invention is to provide a mold suitable for high-speed impact pressing technology in view of the above disadvantages. A mechanical stop device is provided in the mold holding and guiding device, and a step to prevent ejection is provided on the moving die punch. After the die punch is moved upward for a certain distance by the reaction force of the product, its own steps are in contact with the stop device in the mold guide device, thereby preventing the upper die punch from popping out of the holding device, thereby solving the problem of high-speed impact pressing The rebound problem of the upper die punch.

The mold suitable for high-speed impact pressing technology is realized by adopting the following scheme: the mold structure suitable for high-speed impact pressing technology includes upper die plate, concave die plate, guide post, guide sleeve, upper die punch, impact briquetting block, upper die guide device, Concave die, lower die punching. Guide pillars and guide sleeves are installed between the upper template and the concave template, the guide device of the upper mold is installed on the upper template, the concave mold is installed on the concave template, and the lower punch matches the concave mold.

The guide device of the upper mold includes a guide sleeve, a stopper, and a gland. The guide sleeve is installed in the installation hole of the guide sleeve in the middle of the upper formwork, and the stopper is installed at the middle and upper position of the guide sleeve. The upper part of the stopper is equipped with a gland to prevent the stopper, impact block and punch from slipping out during high-speed impact pressing. The gland is fixed on the upper end of the guide sleeve. The upper end of the guide sleeve is provided with an outward step, and the lower end is provided with a Inwardly stepped hole.

Both the impact briquetting block and the upper die punch are installed in the guide sleeve of the upper die guide device. The impact briquetting block is mounted on the upper part of the upper die punch. A step to prevent ejection is set on the upper die punch.

In the present invention, by improving the structure of the mold, a mechanical stopper is set in the mold holding and guiding device, and a step to prevent ejection is set on the moving die punch. After a distance, its own step contacts a stop in the die guide, preventing the upper die punch from popping out of the holder. The stopper in the mold guiding device is made of plastic material with strong shock absorption, which not only prevents the punch from popping out, but also plays a buffer role. After the upper die punch rebounds upwards and is buffered by the stop device, it returns to the lowest position under the drive of the hammer head of the self-recovering press.

The mold suitable for high-speed impact pressing technology has reasonable design, compact structure and convenient use. Because the present invention adopts the guide device of the upper die, the manufactured mold and its supporting mold base device can ideally solve the problem of rebound of the upper die punch during high-speed impact pressing.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Figure 1 is a schematic diagram of the mold structure suitable for high-speed impact pressing technology.

Fig. 2 is a schematic diagram of a mold pressing state suitable for high-speed impact pressing technology.

Marks in the attached drawings: 1, upper template, 2, concave template, 3, impact briquetting block, 4, upper die punch, 5, guide sleeve, 6, guide post, 7, die, 8, lower die punch, 9, Products, 10, block, 11, gland, 12, the outward step set on the upper end of the guide sleeve, 13, the step preventing pop-up set on the impact briquetting block, 14, the step preventing pop-up set on the upper die, 15. The inward step hole provided at the lower end of the guide sleeve, 16. The guide sleeve

Detailed ways

Referring to accompanying drawings 1 and 2, the mold structure suitable for high-speed impact pressing technology includes an upper die plate 1, a concave die plate 2, a guide post 6, an upper die punch 4, an impact briquetting block 3, an upper die guide device, a die 7, and a lower die Rush 8. A guide post 6 and a guide sleeve 16 are installed between the upper template 1 and the concave template 2, the guide post 6 can be fixed on the concave template 2, the guide sleeve 16 can be fixed on the upper template 1, and the guide sleeve 16 and the guide post 6 slide mutually Cooperate, it is convenient to slide up and down when the upper formwork 1 and the concave formwork 2 are working. The upper mold guiding device is installed on the upper template 1, the die 7 is installed on the die template 2, and the lower die punch 8 is matched with the die 7.

The upper mold guiding device includes a guide sleeve 5, a stopper 10, and a gland 11. The guide sleeve 5 is installed in the guide sleeve installation hole in the middle of the upper formwork 1, and the stopper 10 is installed at the middle and upper position of the guide sleeve 5. Gland 11 is equipped with on block 10 tops, prevents block 10, impact briquetting block 3, upper die punching 4 from slipping out in high-speed impact pressing, and gland 11 is fixed on guide sleeve 5 upper ends.

The impact briquetting block 3 and the upper die punch 4 are all installed in the guide sleeve 5 of the upper die guide. The impact briquetting block 3 is contained in the upper die punch 4 tops. A step 13 to prevent ejection is provided on the impact briquetting block 3, and a step 14 to prevent ejection is provided on the upper die punch 4. The upper end of the guide sleeve 5 is provided with an outward step 12, which is convenient to be fixed on the upper template 1, and the lower end of the guide sleeve 5 is provided with an inward step hole 15, which cooperates with the step 14 provided on the upper die punch 4 to prevent ejection. The upper die punch 4 pops up and slips off from the guide sleeve 5 when the high-speed impact pressing works.

As shown in attached drawing 1, this mechanism is the formwork and mold structure diagram adopted by the high-speed impact press. Part 1 is the upper template, and part 2 is the concave template. In the attached drawing, the upper template 1 is at the highest position, also called waiting position; concave template 2 is in the loading position. The upper die device is composed of two parts, the impact press block 3 and the upper die punch 4; the top of the impact press block 3 is directly in contact with the hammer head of the high-speed impact press, and its material is made of high-performance alloy tool steel CALMAX to ensure its transmission The hydraulic hammer head of the press has a long service life at the same time; the upper die punch 4 enters the die 7 when it is working, and directly contacts the powder or workpiece. Its material is powder high-speed steel ASP2012 to ensure the upper die punch 4 Has accurate hardness and good wear resistance, prolonging the service life of the mold. The impact briquetting block 3 and the upper die punch 4 are all installed in the guide sleeve 5, and can freely slide up and down in the guide sleeve 5. Stopper 10 is installed in the upper middle position of guide sleeve 5, and stopper 10 can adopt polyurethane material stopper, can also play certain cushioning effect while preventing upper die punch 4, impact briquetting block 3 from ejecting.

As shown in Figure 2, the upper die plate is in the pressing position, and the upper die punch 4 enters the cavity of the die 7 driven by the upper die plate 1 and contacts the powder or the workpiece; at this time, the upper hammer of the press can pass through the press Block 3 preloads the powder to degas the powder. When pressing, the hammer head of the high-speed press will act on the top of the briquetting block 3 at a speed exceeding 10m/S, and the energy will be transferred to the upper die punch 4 and the powder or workpiece through the briquetting block 3, so that the workpiece will Rapid molding within 7. The reaction force generated by the product 9 will prompt the upper die punch 4 and the briquetting block 3 to move upward rapidly. After the briquetting block 3 with the step 13 to prevent ejection moves upward for a certain distance, the stepped surface of the ejected step 13 and the guide sleeve 5 The inner block 10 is in contact, so that the briquetting block 3 and the upper die punch 4 cannot be ejected outside the upper die guide sleeve 5 .

Claims (4)

1. A mold suitable for high-speed impact pressing technology, characterized in that it includes an upper die plate, a concave die plate, a guide post, a guide sleeve, an upper die punch, an impact briquetting block, an upper die guide device, a die, and a lower die punch; There are guide pillars and guide sleeves between the template and the concave template, the guide device of the upper mold is installed on the upper template, the concave mold is installed on the concave template, and the lower punch is matched with the concave mold; The guiding device of the upper mold includes a guide sleeve, a stopper, and a gland. The guide sleeve is installed in the installation hole of the guide sleeve in the middle of the upper formwork. The stopper is installed at the middle and upper position of the guide sleeve. put on the end; Both the impact briquetting block and the upper die punch are installed in the guide sleeve of the upper die guide device, and the impact briquetting block is installed on the upper part of the upper die punch; Steps to prevent ejection are arranged on the upper die punch. 2. The mold suitable for high-speed impact pressing technology according to claim 1, characterized in that the upper end of the guide sleeve is provided with an outward step, and the lower end is provided with an inward stepped hole. 3. The mold suitable for high-speed impact pressing technology according to claim 1, characterized in that a step to prevent ejection is set on the impact pressing block. 4. The mold suitable for high-speed impact pressing technology according to claim 1, characterized in that the stopper is made of polyurethane material.

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