CN214557389U - Metal injection molding post-sintering pressing secondary molding device - Google Patents

Abstract

A metal injection molding and sintering post-pressing secondary forming device comprises an upper module and a lower module, wherein the lower module comprises a lower die fixing plate, and a lower die base plate is fixedly arranged on the lower die fixing plate; the floating needle is cylindrical and comprises a head part, a middle part and a tail part, the diameter of the head part is smaller than that of the middle part, the diameter of the middle part is smaller than that of the tail part, the floating needle is inserted into a circular step hole of the lower die insert fixing block, and the tail part of the floating needle is inserted into a blind hole of the lower die base plate and pressed on a floating needle spring.

Description

Metal injection molding post-sintering pressing secondary molding device

Technical Field

This scheme relates to metal powder injection moulding technical field, concretely relates to metal injection moulding presses secondary forming device after sintering.

Background

The basic technological process of the technology is that firstly, metal powder and adhesive meeting MIM requirement are selected, then the powder and adhesive are mixed into uniform injection moulding feed material by adopting proper method at a certain temp., and then the feed material is granulated and injection-moulded on the injection moulding machine, and the obtained moulded blank is degreased, sintered and densified into the final product. The metal injection molding technique has unique advantages in preparing high precision near net shape products with complex geometric shapes, uniform tissue structures and high performance. Any metal or alloy that can be made into a powder can be used to make the part by this method. In addition, the technology can completely realize automatic continuous operation and has high production efficiency.

However, the tolerance range of the products produced by the current metal injection molding process is three thousandths. For products with large size (30 mm-300 mm), the size precision can not be ensured. For example, a product with the length of 100mm, the dimension error is 0.3 mm. Such as: 100 (example length) × 0.3% (tolerance ratio) =0.3 (0.3 is tolerance band, unit mm). The tolerance of +/-0.05 mm cannot be guaranteed conventionally for products. The metal injection molding process does not have the feasibility of precision manufacturing of larger sized parts.

Disclosure of Invention

The scheme aims to overcome the defects and shortcomings of the prior art of powder injection molding, and particularly aims to provide a large product with large size fluctuation after sintering and molding. In view of such circumstances, a post-metal injection molding and sintering press secondary molding apparatus is provided.

In order to achieve the purpose, the technical scheme adopted by the scheme is as follows: a metal injection molding and sintering post-pressing secondary forming device comprises an upper module and a lower module, wherein the lower module comprises a lower die fixing plate, and a lower die base plate is fixedly arranged on the lower die fixing plate; the floating needle is cylindrical and comprises a head part, a middle part and a tail part, the diameter of the head part is smaller than that of the middle part, the diameter of the middle part is smaller than that of the tail part, the floating needle is inserted into a circular step hole of the lower die insert fixing block, and the tail part of the floating needle is inserted into a blind hole of the lower die base plate and pressed on a floating needle spring.

The difference between the diameter of the head part of the floating needle and the diameter of the middle part of the floating needle is 0.2mm-0.47 mm.

The upper die block comprises an upper die fixing plate, a die insert pressing plate is fixedly arranged at the bottom of the upper die fixing plate, an upper die pressing tooth forming die insert and an upper die base plate are arranged on the bottom surface of the upper die base plate, a die insert fixing block is arranged on the upper die insert fixing block and corresponds to the position of the floating needle, a square step hole is formed in the upper die insert fixing block, a striker is assembled on the upper die insert fixing block through the square step hole and comprises a head portion and a rod portion, and the head portion is quadrangular and larger than the radial size of the rod portion.

The upper die insert fixing block is provided with a square through hole for accommodating the upper die-pressing tooth forming insert, and the upper die insert fixing block is sleeved on the upper die-pressing tooth forming insert. The square step hole is formed in the upper die base plate, the square step hole is sleeved on the insert pressing plate and the upper die pressing tooth forming insert to limit the vertical and circumferential degrees of freedom of the insert pressing plate and the upper die pressing tooth forming insert, the position degree of a square through hole of an upper die insert fixing block is required to be 0.01mm, and the hole size tolerance is controlled to be +/-0.005 mm, so that the use precision of the tool is guaranteed.

The position degree of a square step hole of the upper die insert fixing block is required to be 0.01mm, and the tolerance of the size of the hole is required to be +/-0.005 mm.

The lower die base plate is also provided with a lower die positioning insert and a lower die insert fixing plate, and the lower die insert fixing plate is provided with a square step hole for assembling a lower die insert fixing block. The lower die insert fixing block is provided with a square hole positioning lower die positioning insert, the position degree of a square hole and a circular step hole on the lower die insert fixing block is required to be 0.01mm, the size tolerance of the hole is controlled to be +/-0.005 mm, and the lower die positioning insert and a floating needle are assembled in the hole, so that the positioning accuracy of a product placed in a tool is ensured.

And a lower die insert fixing plate and a lower die backing plate are fixed on the lower die fixing plate through a lower die insert fixing plate locking screw which penetrates through a lower die insert fixing plate and a screw through hole on the lower die backing plate.

A tool guide rod is arranged in a circular step hole in the upper die base plate, and the circular step hole in the upper die base plate is a positioning reference for processing the upper die fixing plate.

The lower die insert fixing plate is provided with a circular step hole as a positioning reference for machining the lower die insert fixing plate to install the tooling guide sleeve, so that the relative accuracy of the upper die tooling guide rod and the tooling guide sleeve is very high. The tool guide rod and the tool guide sleeve are matched to move up and down.

The upper module tooling guide rod and the tooling guide sleeve move up and down in a matched mode. The fit clearance between the upper module tooling guide rod and the tooling guide sleeve is 0.01mm and is less than 0.05 mm. Therefore, the upper module tooling guide rod and the tooling guide sleeve are mutually matched to be used as the final precise positioning of the upper module and the lower module.

A circular step hole is formed in the upper die insert fixing plate, the position degree is required to be 0.01mm, and the size tolerance of the hole is required to be +/-0.005 mm. The upper die insert fixing block is fixedly arranged in a circular step hole of the upper die insert fixing plate.

And a tool guide rod is arranged on the bottom surface of the upper die insert fixing plate. And the upper die fixing plate and the die carrier guide sleeves are mutually and closely matched and fixed. The die set guide rod is matched and fixed with the lower die fixing plate, and a round wire spring is sleeved on the die set guide rod. The fit clearance between the die carrier guide sleeve and the die carrier guide rod is 0.05 mm.

The upper die insert fixing plate and the upper die insert fixing plate are fixed on the upper die fixing plate through an upper die base plate and a screw through hole in the upper die insert fixing plate by an upper die insert fixing plate locking screw.

And the material hardness of the upper die teeth forming insert can be selected to be HRC 40-HRC 95.

The working table surface of the punching equipment is provided with a round hole which can be matched with the positioning ring. The locating ring passes through the locating ring set screw to be fixed at the top of the upper die fixing plate, and the locating ring is used for completing the coarse location (within +/-0.1 mm of locating precision) of the whole set of tool and the stamping equipment workbench, so that the effectiveness of the tool on the stamping equipment is ensured.

The beneficial effects of this scheme metal injection molding post-sintering suppression post forming device are: and the mass production of a part of products with larger sizes cannot be realized by using a powder forming process due to the unstable powder sintering process. By using the scheme, secondary forming is realized through a cheap stamping process, and the technical problem that the size fluctuation of a large-size (30-300 mm) powder forming product after sintering cannot meet the assembly requirement is solved. Greatly improves the productivity of product production and reduces the product cost. The lower die insert fixing block is completely attached to the shape and size of a part and the appearance of a product, and can perform secondary shaping and stabilizing effects on the product in pressing work. The deformation of the product caused by uneven stress can be avoided in the tooth pressing process. The upper die insert fixing block is completely attached to the product in characteristic shape, and can finish precise positioning and fixing with the product. The lower die insert fixing block is internally provided with a lower die positioning insert, and the lower die cushion plate is provided with a floating needle spring. The product placed in the tool is accurately positioned before die assembly through the lower die positioning insert and the floating needle spring. In order to ensure the positioning precision, the processing precision of all single parts is within 0.005mm, and the integral position precision of the assembled parts is within 0.01 mm. Thereby ensuring stable yield of mass production. An upper die pressing tooth forming insert is arranged on the upper die block, the upper die pressing tooth forming insert is provided with size characteristics which are consistent with the secondary forming of the product, and the part precision is +/-0.005 mm. Under the pressure of large tonnage (100-1000 tons), the upper die pressing tooth forming insert is pressed with the product, and the lower die positioning insert supports and fixes the product from the bottom. And pressing and molding the shape characteristics of the upper die pressing tooth molding insert on the product. And finishing the secondary forming of the shape characteristics of the product. Simple structure, the forming process is convenient, through the mode of sintering earlier secondary molding again, can effectively solve the undulant big defect of powder injection moulding sintering size, can guarantee the dimensional requirement of finished piece high accuracy, guarantees that the finished piece reaches operation requirement. The precision can reach within plus or minus 0.05 mm. The large-size product manufactured by the metal injection molding process has feasibility.

Drawings

Fig. 1 is a schematic diagram of the basic structure of the scheme. Fig. 2 is a view a-a in fig. 1. Fig. 3 is a schematic diagram of a module in the scheme. Fig. 4 is a view B-B in fig. 3. Fig. 5 is a schematic view of the structure of the module according to the present embodiment. Fig. 6 is a view C-C in fig. 5. Fig. 7 is an enlarged view of a portion D in fig. 2. Figure 8 is a front view of the 13-up molding tooth forming insert. Fig. 9 is a 3D view of fig. 8. Fig. 10 is a front view of the product. Fig. 11 is a view E-E of fig. 10. Fig. 12 is a top view of fig. 10. Fig. 13 is a 3D view of fig. 10. Fig. 14 is a 3D diagram of fig. 3. Fig. 15 is a 3D diagram of fig. 5. FIG. 16 is a view showing the relationship between the float pin and the product in the mold-opened state of FIG. 7. FIG. 17 is a view showing the mating relationship between the float pins and the product in the clamped state of FIG. 7.

In the figure: 1-a positioning ring; 2-positioning ring fixing screw; 3-a mould frame guide rod; 4-die carrier guide sleeve; 5-upper die fixing plate; 6, upper die backing plate; 7-a striker; 8-fixing the upper mold insert; 9-lower die insert fixing plate; 10-lower die backing plate; 11-lower die fixing plate; 12-insert platen; 13-pressing the tooth molding insert on the die; 14-fixing the upper die insert block; 15-lower die insert fixing block; 16-a round wire spring; 17-lower die positioning insert; 18-a floating needle spring; 19-a floating needle; 20-a tooling guide rod; 21-fixing a plate mold locking screw by an upper mold insert; 23-fixing a plate mold locking screw by a lower mold insert; 24-a tooling guide sleeve; 25-pressing the product into a molding surface; and 26-product floating needle positioning holes.

Detailed Description

As shown in fig. 1 to 6, a metal injection molding post-sintering press secondary molding apparatus includes an upper mold block (fig. 3, 4) and a lower mold block (fig. 5, 6).

As shown in fig. 3, 4 and 14, the upper module includes an upper mold fixing plate 5, an insert pressing plate 12 is fixedly disposed at the bottom of the upper mold fixing plate 5, an upper mold pressing tooth forming insert 13 and an upper mold backing plate 6 are disposed on the upper mold backing plate 6, an upper mold insert fixing block 14 is disposed on the bottom surface of the upper mold backing plate 6, a square step hole is disposed on the upper mold insert fixing block 14 corresponding to the position of the floating needle, a striker 7 is assembled on the upper mold insert fixing block 14 through the square step hole, the striker 7 includes a head portion and a rod portion, and the head portion is quadrangular and larger than the radial dimension of the rod portion. The upper die insert fixing block 14 presses the striker 7, the striker 7 does not move along with the movement of the tool, and the material is high-hardness wear-resistant material, so that the service life of the tool is prolonged.

As shown in fig. 3, the upper mold insert fixing block 14 is provided with a square through hole for accommodating the upper molding tooth forming insert 13, and the upper mold insert fixing block 14 is fitted on the upper molding tooth forming insert 13. The upper die base plate 6 is provided with a square step hole which is sleeved on the insert pressing plate 12 and the upper die pressing tooth forming insert 13 to limit the vertical and circumferential freedom degrees of the insert pressing plate 12 and the upper die pressing tooth forming insert 13, the position degree of a square through hole of the upper die insert fixing block 14 is required to be 0.01mm, and the hole size tolerance is controlled to be +/-0.005 mm, so that the use precision of the tool is ensured.

The position degree of a square step hole of the upper die insert fixing block 14 is required to be 0.01mm, and the tolerance of the size of the hole is required to be +/-0.005 mm. The upper die insert fixing block 14 has a characteristic shape completely attached to the product, and can finish precise positioning and fixing with the product.

As shown in fig. 5, 6 and 15, the lower mold block includes a lower mold fixing plate 11, a lower mold pad 10 is fixedly disposed on the lower mold fixing plate 11, a blind hole is disposed on the top surface of the lower mold pad 10, a floating needle spring 18 is disposed in the blind hole, a lower mold insert fixing block 15 is further disposed on the lower mold pad 10, and a circular step hole is disposed on the lower mold insert fixing block 15 for positioning a floating needle 19; the floating needle 19 is cylindrical and comprises a head part, a middle part and a tail part, the diameter of the head part is smaller than that of the middle part, the diameter of the middle part is smaller than that of the tail part, the floating needle 19 is inserted into a circular step hole of the lower die insert fixing block 15, and the tail part of the floating needle 19 is inserted into a blind hole of the lower die base plate 10 and pressed on the floating needle spring 18.

As shown in figure 7, the diameter of the head part of the floating needle 19 is 2mm, the diameter of the middle part of the floating needle 19 is 2.47mm, the difference between the diameter of the head part of the floating needle and the diameter of the middle part of the floating needle is 0.47mm, and the value of the unilateral clearance is 0.235 mm. After verification: when the unilateral clearance value is 0.05mm, influenced by product size fluctuation, the condition that 3 product float needle locating holes 26 are pulled to be damaged can appear in 100 products. When the unilateral clearance value is 0.1mm, all 100 products are qualified. In order to completely eliminate the occurrence of pulling damage to the floating needle positioning hole 26 of the product, and simultaneously ensure the strength of the floating needle 19 when the firing pin 7 interacts with the floating needle 19. The head diameter of the float needle 19 is 2mm data. Through the verification, the difference value range between the head part and the middle part of the floating needle 19 is as follows: 0.2mm-0.47 mm. The upper limit of 0.47mm can be continuously increased by 1mm under the condition of sacrificing the strength of the part of the floating needle 19, and the difference between the head part and the middle part of the floating needle 19 after the increase is within a limit range: 0.2mm-1.47 mm.

As shown in fig. 16 and 17, the floating needle positioning hole 26 of the product of fig. 16 is positioned at the middle of the floating needle 19, during the pressing process of the tool, the striker 7 firstly contacts the floating needle 19, the floating needle spring 18 is arranged below the floating needle 19, and the floating needle spring 18 is compressed by the downward force of the floating needle 19. The floating needle 19 moves downwards along the vertical direction of the step round hole on the lower die insert fixing block 15 until the upper die block and the lower die block are closed in place and stop moving. At this time, as shown in fig. 17, the product float positioning hole 26 is at the head position of the float 19.

As shown in fig. 15, the lower die backing plate 10 is further provided with a lower die positioning insert 17 and a lower die insert fixing plate 9, and the lower die insert fixing plate 9 is provided with a square step hole for assembling the lower die insert fixing block 15. The lower die insert fixing block 15 is provided with a square hole positioning lower die positioning insert 17, the position degree of the square hole and the circular step hole on the lower die insert fixing block 15 is required to be 0.01mm, the hole size tolerance is controlled to be +/-0.005 mm, and the lower die positioning insert 17 and the floating needle 19 are assembled in the hole, so that the positioning accuracy of a product placed in a tool is ensured. The lower die insert fixing block 15 is completely attached to the shape and size of a part and the appearance of a product, and can perform secondary shaping and stabilizing effects on the product in pressing work. The deformation of the product caused by uneven stress can be avoided in the tooth pressing process.

A lower die positioning insert 17 is arranged in the lower die insert fixing block 15, and a floating needle spring 18 is arranged on the lower die base plate 10. The product placed in the tool is accurately positioned before die assembly through the lower die positioning insert 17 and the floating needle spring 18. In order to ensure the positioning precision, the processing precision of all single parts is within 0.005mm, and the integral position precision of the assembled parts is within 0.01 mm. Thereby ensuring stable yield of mass production.

A lower mold insert fixing plate mold locking screw 23 penetrates through the lower mold insert fixing plate 9 and a screw through hole on the lower mold backing plate 10, and the lower mold insert fixing plate 9 and the lower mold backing plate 10 are fixed on the lower mold fixing plate 11.

As shown in fig. 6, a circular step hole is provided on the upper die backing plate 6 for installing the tool guide rod 20, and the circular step hole of the upper die backing plate 6 is a positioning reference for processing the upper die fixing plate 5.

The lower die insert fixing plate 9 is provided with a circular step hole as a positioning reference for processing the lower die insert fixing plate 9 to install the tooling guide sleeve 24, so that the relative accuracy of the upper die tooling guide rod 20 and the tooling guide sleeve 24 is very high. The tooling guide rod 20 and the tooling guide sleeve 24 are matched to move up and down.

The upper module tooling guide rod 20 and the tooling guide sleeve 24 move up and down in a matched manner. The fit clearance between the upper module tooling guide rod 20 and the tooling guide sleeve 24 is 0.01mm, which is less than the fit clearance between the die carrier guide sleeve 4 and the die carrier guide rod 3 by 0.05 mm. The upper module tooling guide 20 and tooling guide 24 cooperate with each other as the final precision positioning of the upper and lower modules.

A circular step hole is formed in the upper die insert fixing plate 8, the position degree is required to be 0.01mm, and the size tolerance of the hole is required to be +/-0.005 mm. The upper die insert fixing block 14 is fixedly arranged in a circular step hole of the upper die insert fixing plate 8.

And the upper die fixing plate 5 is also provided with die carrier guide sleeves 4 at two sides of the upper die base plate 6, and the upper die fixing plate 5 and the die carrier guide sleeves 4 are mutually and closely matched and fixed. The die carrier guide rod 3 is matched and fixed with the lower die fixing plate 11, and a round wire spring 16 is sleeved on the die carrier guide rod 3. The matching clearance between the die carrier guide sleeve 4 and the die carrier guide rod 3 is 0.05 mm.

The upper die insert fixing plate mold locking screw 21 passes through the upper die backing plate 6 and the screw through hole on the upper die insert fixing plate 8 to fix the upper die backing plate 6 and the upper die insert fixing plate 8 on the upper die fixing plate 5. The upper die teeth forming insert 13 needs to bear a large force in the working process, so the insert pressing plate 12 is arranged at the bottom, and the stress area is increased. The upper die fixing plate 5 is ensured not to be deformed by force.

The upper molding tooth insert 13 has a material hardness selected from the group consisting of HRC 40-HRC 95.

The working table of the punching equipment is provided with a round hole which can be matched with the positioning ring 1. The locating ring 1 is fixed at the top of the upper die fixing plate 5 through the locating ring fixing screw 2, the locating ring 1 is used for completing coarse locating (within +/-0.1 mm of locating precision) of the whole set of tool and a workbench of the stamping equipment, and the effectiveness of the tool in installation on the stamping equipment is ensured.

The floating needle 19 (see figure 6 in detail) is cylindrical and comprises a head part, a middle part and a tail part, the diameter of the head part is smaller than that of the middle part, the diameter of the middle part is smaller than that of the tail part, the difference between the diameter of the head part and the diameter of the middle part is 0.47mm, the floating needle 19 is inserted into a circular step hole of the lower die insert fixing block 15, the tail part of the floating needle 19 is inserted into a blind hole of the lower die base plate 10 and pressed on the floating needle spring 18, and the position degree of the floating needle 19 and the whole tool is controlled to be 0.01 mm. During the process of putting the product, the floating needle ∅ 2.47 is fixed by the size of 2.47mm, and the position size of the product in the tool is ensured not to be deviated.

The floating needle 19 is provided with a hanging table on the lower die insert fixing block 15, and the height of the floating needle 19 is restricted. The bottom is provided with a spring and a round hole avoiding position, and the height of the floating needle 19 is also precisely processed by design and +/-0.02 mm. In the working process, the floating needle 19 moves up and down in the process of the compression and lifting reciprocating motion of the upper module and the contraction and reset of the spring.

In the operation of a large tonnage (100 ton-1000 ton) punch, the cooperation effect of the floating needle 19 of the upper die block and the lower die block which are not clamped with the product 27 (see detailed figure 16), the striker 7 in the upper die block firstly contacts the floating needle 19 to move the floating needle 19 downwards (see detailed figure 17), and the position of the contact between the positioning hole of the product 27 and the floating needle 19 is changed from a big circle which is positioned originally to a small step circle at the head of the floating needle 19. At this time, a certain clearance exists between the small step circle of the floating needle 19 and the round hole of the product 27.

The floating needle 19 has the functions of: the upper molding tooth insert 13 has a serrated surface (see fig. 8 and 9), and the tooling is used to print the serrated features of the upper molding tooth insert 13 onto the product with high pressure. During the time that the upper molding insert 13 is in contact with the product until the pressing is complete, the product is indented by the serrations on the surface of the upper molding insert 13 (see fig. 10, 11 for details), and after the surface of the product is indented, excess iron of the product extends all around. The product positioning hole is extended by the expanded iron to cause the secondary offset of the product hole (see fig. 13, product floating needle positioning hole 26), and if a normal inactive positioning needle is used, the product floating needle positioning hole 26 in fig. 13 will have the phenomenon that the product secondary offset positioning hole is interfered by the positioning needle to cause the pulling damage of the product. The floating needle 19 gives out the expansion gap of the product through the change of the structure, and the occurrence of the bad condition of pulling the product is avoided.

The structure of the floating needle 19 can solve the problem that the unqualified product is pulled due to mutual interference with the original positioning needle position caused by the deformation and the deviation of the positioning hole of the product due to the expansion and the extension of the metal product in the horizontal direction in the pressing process commonly occurring in stamping dies and tools. The solution in the prior art is a method for fixing a positioning needle and increasing the clearance between a product and the positioning needle, wherein the design range of the clearance between a product positioning hole and a tool positioning needle is 0.1-0.2 mm. The result is that the positioning precision of the product in the tool is not high, and the product can only meet the tolerance within +/-0.5 mm. By using the structure of the scheme, the product positioning precision can be controlled within 0.05mm, and the requirement of +/-0.1 mm of product manufacturing precision can be met.

The above description is only an embodiment of the present disclosure, and not intended to limit the scope of the present disclosure, and all modifications of equivalent structures and equivalent processes performed by the present disclosure, or directly or indirectly applied to other related technical fields, are intended to be covered by the present disclosure in the same way.

Claims (10)

1. A metal injection molding and sintering post-pressing secondary forming device comprises an upper module and a lower module, wherein the lower module comprises a lower die fixing plate, and a lower die base plate is fixedly arranged on the lower die fixing plate; the floating needle is cylindrical and comprises a head part, a middle part and a tail part, the diameter of the head part is smaller than that of the middle part, the diameter of the middle part is smaller than that of the tail part, the floating needle is inserted into a circular step hole of the lower die insert fixing block, and the tail part of the floating needle is inserted into a blind hole of the lower die base plate and pressed on a floating needle spring.

2. The metal injection molding post-sintering press secondary molding device as claimed in claim 1, wherein the difference between the diameter of the head portion and the diameter of the middle portion of the float pin is 0.2mm to 0.47 mm.

3. The metal injection molding post-sintering pressing secondary forming device as claimed in claim 1, wherein the upper mold block includes an upper mold fixing plate, an insert pressing plate is fixedly disposed at the bottom of the upper mold fixing plate, an upper pressing tooth forming insert and an upper mold backing plate are disposed on the bottom surface of the upper mold backing plate, a square step hole is disposed on the upper mold insert fixing block corresponding to the position of the floating pin, a striker is assembled on the upper mold insert fixing block through the square step hole, the striker includes a head portion and a rod portion, and the head portion is quadrangular and larger than the radial dimension of the rod portion.

4. The metal injection molding post-sintering press secondary molding apparatus of claim 3, wherein the upper mold insert fixing block is provided with a square through hole for receiving the upper molding tooth insert, and the upper molding tooth insert is fitted on the upper molding insert fixing block.

5. The metal injection molding post-sintering pressing secondary molding device as claimed in claim 4, wherein the position of the square through hole of the upper mold insert fixing block is required to be 0.01mm, and the size tolerance of the hole is controlled to be +/-0.005 mm, so that the use precision of the tool is ensured; the position degree of a square step hole of the upper die insert fixing block is required to be 0.01mm, and the tolerance of the size of the hole is required to be +/-0.005 mm.

6. The metal injection molding post-sintering press secondary molding device according to claim 1, wherein a lower mold positioning insert and a lower mold insert fixing plate are further provided on the lower mold backing plate, the lower mold insert fixing plate being provided with a square step hole for fitting the lower mold insert fixing block; the lower die insert fixing block is provided with a square hole positioning lower die positioning insert, the position degree of a square hole and a circular step hole on the lower die insert fixing block is required to be 0.01mm, the size tolerance of the hole is controlled to be +/-0.005 mm, and the lower die positioning insert and a floating needle are assembled in the hole, so that the positioning accuracy of a product placed in a tool is ensured.

7. A compression overmolding apparatus after metal injection molding and sintering as claimed in claim 6 wherein the lower mold insert holding plate mold locking screws pass through the lower mold insert holding plate and the screw holes in the lower mold shim plate to hold the lower mold insert holding plate and the lower mold shim plate on the lower mold holding plate.

8. A post-sinter press secondary molding apparatus as claimed in claim 6, wherein the upper mold block includes an upper mold fixing plate, an upper mold backing plate is fixedly disposed at the bottom of the upper mold fixing plate, a tooling guide rod is installed in a circular step hole formed in the upper mold backing plate, a tooling guide sleeve is installed in a circular step hole formed in the lower mold insert fixing plate, and the tooling guide rod and the tooling guide sleeve are matched to move up and down.

9. The metal injection molding post-sintering press secondary molding apparatus as claimed in claim 3, wherein the upper mold insert fixing plate mold locking screw passes through the upper mold pad plate, the screw through hole on the upper mold insert fixing plate, and fixes the upper mold pad plate and the upper mold insert fixing plate on the upper mold fixing plate.

10. The metal injection molding post-sintering press secondary molding device as claimed in claim 3, wherein a positioning ring is fixed to the top of the upper mold fixing plate by a positioning ring fixing screw.

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