CN216828445U - Screw blind hole structure prepared by sheet material forming and production mold thereof - Google Patents

Abstract

The utility model provides a screw blind hole structure of sheet material shaping preparation and production mould and technology thereof, the structure includes sink platform, recessed root keep away position, cusp muscle and blind hole, through seting up recessed root keep away position transitional coupling between sink platform and the blind hole, the root keeps away the position and sets up in the inboard of sink platform, the outside bottom round of sink platform is provided with the cusp muscle, root keep away and be provided with the lower part step between the position and the cusp muscle; the production mould comprises an upper mould component and a lower mould component, wherein a blank is placed at the top of a lower floating block in the lower mould component, a first lower nitrogen spring is arranged at the bottom of the lower floating block, and a second lower nitrogen spring is arranged at the bottom of a lower ejector rod. The utility model discloses can guarantee the leakproofness of blind hole, avoid the bad risk of gas tightness of screw thread through-hole, reduce the use of auxiliary seal spare, low in production cost, production efficiency is high, satisfies the requirement of big batch, high-quality, stable production.

Description

Screw blind hole structure prepared by sheet material forming and production mold thereof

Technical Field

The utility model relates to a machine tooling field especially relates to screw blind hole structure and production mould of sheet material shaping preparation.

Background

Along with new energy automobile's popularization, need constantly develop the bolt that corresponds direct production on the sheet material, both need guarantee the production efficiency and the quality requirement of screw, can satisfy the sealing performance after the installation again, prior art mostly needs the supplementary sealing member of cooperation later stage to accomplish sealed effect, consequently the technology of similar product is numerous and diverse and with high costs.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect of prior art, the utility model provides a screw blind hole structure of sheet material shaping preparation, keep away position 2, cusp muscle 3 and blind hole 4 including heavy platform 1, recessed root, keep away position 2 transitional coupling through seting up recessed root between heavy platform 1 and the blind hole 4, the root is kept away position 2 and is set up the inboard at heavy platform 1, the outside bottom round of heavy platform 1 is provided with cusp muscle 3, the root is kept away and is provided with lower part step 5 between position 2 and the cusp muscle 3.

Preferably, the bottom of the lower step 5 is horizontal and lower than the lower surface of the plate.

Production mould of screw blind hole structure of sheet material shaping preparation, it includes: the device comprises an upper die assembly and a lower die assembly, wherein a punch fixing structure 6 and a pressing structure 7 which are elastically connected in parallel are sequentially arranged in the upper die assembly from top to bottom, and an upper nitrogen spring 8 is arranged between the punch fixing structure 6 and the pressing structure 7;

the lower die assembly is internally provided with a lower ejector rod 9, a female die 10 and a lower buoyancy lifting block 11 which are coaxially sleeved in place from inside, blanks are placed at the top of the lower buoyancy lifting block 11, a first lower nitrogen spring 12 is arranged at the bottom of the lower buoyancy lifting block, and a second lower nitrogen spring 13 is arranged at the bottom of the lower ejector rod 9.

Preferably, the blank comprises a toothed rib and a storage material, the toothed rib forms a circle at the bottom of the plate material through ribbing, and the storage material is upset and extruded from the top of the plate material.

Preferably, the spring force of the upper nitrogen spring 8 is greater than the sum of the spring forces of the first lower nitrogen spring 12 and the second lower nitrogen spring 13.

Preferably, the punch fixing structure 6 comprises an upper die holder, an upper backing plate and an upper fixing plate which are sequentially and elastically connected in parallel from top to bottom, the upper die holder, the upper backing plate and the upper fixing plate form an upper half section which can move in time along with the press, a punch 14 is fixedly installed on one side of the upper die holder close to the upper backing plate, and the punch 14 penetrates through the pressing structure 7 below;

the material pressing structure 7 comprises a discharging backing plate and a discharging plate which are fixed from top to bottom to form a buffer section, a punch sheath 16 is installed in the discharging plate through a sheath positioning block 15, and a through hole penetrating through a punch 14 is formed in the punch sheath 16.

Preferably, a rigid limit 17 is further arranged in the lower die assembly, and the rigid limit 17 is arranged around the top of the lower die assembly.

The utility model has the advantages that:

(1) regarding the blind via structure: the blind hole used for the self-tapping screw is prepared in the thickness direction of the aluminum, copper and steel flat plates by adopting a punch forming process and utilizing the fluidity of the material, the blind hole can be used for fastening the self-tapping screw, and the sealing property of the blind hole can be still ensured because the blind hole is a blind hole and is tapped;

(2) regarding the blind via structure: the shell fastening structure can be used for electronic products, in particular to a shell fastening structure of control components such as an electronic ECU (electronic control unit) of an automobile and the like;

(3) regarding the blind via structure: the sealing performance of the threaded part of the shell adopting the structure is greatly improved, the risk of poor air tightness of the threaded through hole is completely avoided, the use of auxiliary sealing elements is reduced, and the cost is reduced;

(4) regarding the production mold and the process: can be continuously punched through a plurality of working procedures by a punch forming process, and has low production cost and high production efficiency;

(5) regarding the production mold and the process: meets the requirements of large-batch, high-quality and stable production.

Drawings

FIG. 1 is a schematic diagram of the blank of the present invention;

FIG. 2 is a schematic diagram of the structure of the blind hole of the present invention;

FIG. 3 is a structural diagram of the fastening installation of the present invention;

fig. 4 is a block diagram of step 3.1 of the present invention relating to the mold;

fig. 5 is a block diagram of step 3.2 of the present invention with respect to the mold;

fig. 6 is a block diagram of step 3.3 of the present invention with respect to the mold;

fig. 7 is a block diagram of step 3.4 of the present invention with respect to the mold;

fig. 8 is a block diagram of step 3.5 of the present invention with respect to the mold;

fig. 9 is a block diagram of step 3.6 of the present invention with respect to the mold;

fig. 10 is a block diagram of step 3.7 of the present invention relating to the mold;

fig. 11 is a block diagram of step 3.8 of the present invention with respect to the mold;

fig. 12 is a block diagram of step 3.9 of the present invention with respect to the mold;

in the figure, the position of the upper end of the main shaft,

1. sinking a platform; 2. avoiding the root; 3. tooth-shaped ribs; 4. blind holes; 5. a lower step; 6. a punch fixing structure; 7. a material pressing structure; 8. feeding a nitrogen spring; 9. a lower ejector rod; 10. a female die; 11. A lower buoyant lift block; 12. a first lower nitrogen spring; 13. a second lower nitrogen spring; 14. a punch; 15. a sheath positioning block; 16. a punch sheath; 17. and rigid limiting.

Detailed Description

In order to make the technical solution of the present invention better understood and make the above features, objects and advantages of the present invention more comprehensible, the present invention is described in further detail with reference to the accompanying drawings. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention.

Screw blind hole structure for sheet material forming preparation

As shown in fig. 2, the screw blind hole structure prepared by plate material forming in the present invention includes: the sink table comprises a sink table 1, a concave root avoiding position 2, a toothed rib 3 and a blind hole 4, wherein the sink table 1 and the blind hole 4 are in transitional connection through the concave root avoiding position 2, the root avoiding position 2 is arranged on the inner side of the sink table 1, the toothed rib 3 is arranged on the bottom of the outer side of the sink table 1 in a circle, and a lower step 5 is arranged between the root avoiding position 2 and the toothed rib 3;

wherein, heavy platform: the material used for replenishing the material downwards is generated when upsetting and extruding, and the material of the sinking platform part moves towards the thickness direction in the forming process to form a side wall part of the blind hole;

gear ring: when the upper material is upset and extruded downwards, the material moves towards the thickness direction of the material and perpendicular to the thickness direction of the material respectively, if the material moving towards the direction perpendicular to the thickness direction is too much, the wall thickness and the height of the blind hole can be reduced, and the gear ring is characterized by aiming at providing flow resistance for the material moving laterally, reducing the lateral movement of the material and enabling the height and the wall thickness of the blind hole to be fuller and more stable;

avoiding the root: when the lower step is used as an assembly surface, the lower step is used for assembly avoidance;

blind hole: the blind hole is directly formed by the punch, has high dimensional accuracy and high strength after forming and hardening treatment.

In this embodiment, the bottom of the lower step 5 is preferably horizontal and lower than the lower surface of the plate.

The lower step with the structure can be used for lower surface assembly, the step can be generated firstly in the material forming process, and the resistance of lateral material flow can be increased due to the fact that the step is lower than the lower surface of the plate and is matched with the gear ring.

Production die of screw blind hole structure about sheet metal shaping preparation

As shown in fig. 4-12, the mold for producing blind hole structure of screw according to the present invention comprises: the device comprises an upper die assembly and a lower die assembly, wherein a punch fixing structure 6 and a pressing structure 7 which are elastically connected in parallel are sequentially arranged in the upper die assembly from top to bottom, and an upper nitrogen spring 8 is arranged between the punch fixing structure 6 and the pressing structure 7;

the lower die assembly is internally provided with a lower ejector rod 9, a female die 10 and a lower buoyancy lifting block 11 which are coaxially sleeved in place from inside, blanks are placed at the top of the lower buoyancy lifting block 11, a first lower nitrogen spring 12 is arranged at the bottom of the lower buoyancy lifting block, and a second lower nitrogen spring 13 is arranged at the bottom of the lower ejector rod 9.

In this implementation, the blank preferably includes a toothed bar and a stock, the toothed bar forms a circle at the bottom of the plate by beating the bar, and the stock is upset and squeezed from the top of the plate.

In this embodiment, the spring force of the upper nitrogen spring 8 is preferably greater than the sum of the spring forces of the first lower nitrogen spring 12 and the second lower nitrogen spring 13.

Preferably, in this embodiment, the punch fixing structure 6 includes an upper die holder, an upper backing plate, and an upper fixing plate, which are elastically connected in parallel from top to bottom in sequence, and become an upper half section capable of moving in time with the press, a punch 14 is fixedly installed on one side of the upper die holder close to the upper backing plate, and the punch 14 penetrates through the pressing structure 7 below;

the material pressing structure 7 comprises a discharging backing plate and a discharging plate which are fixed from top to bottom to form a buffer section, a punch sheath 16 is installed in the discharging plate through a sheath positioning block 15, and a through hole penetrating through a punch 14 is formed in the punch sheath 16.

Set up above-mentioned structure, play the effect of quick location drift and installation drift sheath simultaneously, it is high-efficient convenient.

In this embodiment, preferably, a rigid limit 17 is further disposed in the lower die assembly, and the rigid limit 17 is disposed around the top of the lower die assembly.

By means of the structure, the phenomenon that the upper die assembly is excessive in descending can be prevented, and a protection effect is achieved.

As shown in fig. 1 to 12, the production process of the screw blind hole structure combined production mold for sheet material forming preparation is as follows:

step 1: and (3) ribbing:

beating ribs on the metal plate, and beating a circle of tooth-shaped ribs around the blind hole structure;

step 2: upsetting and extruding storage material

By utilizing the fluidity of the material, upsetting and extruding the material on the upper side of the plate downwards to enable the material to flow in the thickness direction;

and step 3: forward extrusion

Step 3.1: initial position

The mould is in a separated state, and the blank processed in the steps 1 and 2 is placed on a lower floating block of a lower mould assembly;

step 3.2: downward pressing material for die

The die descends, a punch head sheath of the upper die assembly and the lower surface of a sheath positioning block contact with the blank, and the blank is clamped between the upper die and the lower die at the moment;

step 3.3: continuously downward compressing the lower floating block, and providing pre-pressure by the lower mandril

Because the spring force of the upper nitrogen is far greater than the sum of the forces of the lower nitrogen springs, the upper die compresses the springs below the lower floating block to move downwards in the process of continuing to move downwards, the bottom of the blank is in contact with the lower ejector rod when the stroke of the lower side of the lower floating block is 0.3mm, the nitrogen springs below the lower ejector rod are compressed to move downwards, the blank is in contact with the female die and continues to move downwards when the stroke of the lower side of the lower floating block is 0.1mm in the process, a process avoiding position of a bottom mounting surface of a final product is formed, the discharging plate assembly reaches the position of a lower dead center, and all forming processes are completed by the acting force provided by the upper nitrogen springs in the process;

step 3.4: part contacted by continuous downward punch

The die continues to move downwards, an upper nitrogen spring of the upper die assembly is compressed in the downward moving process, and the punch contacts the upper surface of the blank;

step 3.5: the punch head continues to move downwards to extrude the material, the lower ejector rod provides reverse supporting force to move downwards passively, and the die closing and downward movement is finished

At the moment, the blank is positioned between the sheath positioning block, the punch sheath and the lower buoyancy lifting plate, the upper nitrogen spring compresses along with the descending of the upper die assembly, the compressive stress on the blank is continuously increased, and the punch extrudes the blank in the continuous descending process

Step 3.6: the die moves upwards, and the punch head is separated from the part;

step 3.7: the mould goes upward, and the stroke of the stripper plate is reset;

step 3.8: the die moves upwards, the lower floating plate resets, and the blind hole structure is separated from the female die under the action of the lower floating plate and the ejector rod;

step 3.9: and (5) moving the die upwards to complete the structure forming.

In step 3.3, when the lower side stroke of the lower buoyancy lifting block is still 0.3mm, the lower buoyancy lifting block provides upward pressure for the blank, and when the punch continues to downwards extrude the blank, the blank flows downwards along the cavity of the female die under the action of the circumferential toothed ribs and the lower ejector rod.

The reason for arranging the circumferential toothed rib and the lower ejector rod is that if the punch continues to move downwards, the blank is easy to break if only the downward unidirectional tensile stress is applied to the blank, so that the floating plate provides upward pressure at the position of 0.3mm of stroke in the 3.3 working procedure and the circumferential toothed rib is the key of extrusion forming;

when the upper material is upset and extruded downwards, the material moves towards the thickness direction of the material and perpendicular to the thickness direction of the material respectively, if the material moving towards the direction perpendicular to the thickness direction is too much, the wall thickness and the height of the blind hole can be reduced, and the gear ring is characterized by aiming at providing flow resistance for the material moving laterally, reducing the lateral movement of the material and enabling the height and the wall thickness of the blind hole to be fuller and more stable;

when the punch continues to move downwards, the blank is extruded, but the material can only flow downwards along the cavity of the female die under the action of the circumferential toothed ribs and the ejector rods, the distribution of stress in the forming process is effectively improved by the compressive stress generated by extrusion and the compressive stress provided upwards by the ejector rods, the cracking risk caused by single tensile stress is offset, and the process is similar to the hydrostatic process of fine blanking.

The metal material adopts aluminum or copper or steel as a raw material, the aluminum or copper is adopted as a raw material, and the threads on the inner wall of the blind hole are extruded by self-tapping screws and are simultaneously fastened and installed; the steel is adopted as a raw material, and the threads on the inner wall of the blind hole are formed through an extrusion tapping process and then are fastened and connected.

By adopting the structure, if steel is adopted as raw material, the thread characteristics are formed by adopting an extrusion tapping process, and then fastening connection is carried out, if aluminum or copper is adopted as raw material, the aluminum or copper can be directly extruded by a self-tapping screw to generate threads, and fastening installation is realized.

The above-described embodiments are merely illustrative of the principles and utilities of the present patent application and are not intended to limit the present patent application. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of this patent application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of this patent application.

Claims (7)

1. The screw blind hole structure is characterized by comprising a sinking platform (1), a concave root avoiding position (2), a toothed rib (3) and a blind hole (4), wherein the sinking platform (1) and the blind hole (4) are in transitional connection through the concave root avoiding position (2), the root avoiding position (2) is arranged on the inner side of the sinking platform (1), the toothed rib (3) is arranged on one circle of the bottom of the outer side of the sinking platform (1), and a lower step (5) is arranged between the root avoiding position (2) and the toothed rib (3).

2. The blind screw hole structure formed and prepared by the plate material according to claim 1, wherein: the bottom of the lower step (5) is horizontal and lower than the lower surface of the plate.

3. The production mould of the screw blind hole structure of sheet material shaping preparation, its characterized in that: the punching die comprises an upper die assembly and a lower die assembly, wherein a punching head fixing structure (6) and a material pressing structure (7) which are sequentially, parallelly and elastically connected are arranged in the upper die assembly from top to bottom, and an upper nitrogen spring (8) is arranged between the punching head fixing structure (6) and the material pressing structure (7);

the lower die assembly is internally provided with a lower ejector rod (9), a female die (10) and a lower buoyancy lifting block (11) which are coaxially sleeved in place from inside, blanks are placed at the top of the lower buoyancy lifting block (11), a first lower nitrogen spring (12) is arranged at the bottom of the lower buoyancy lifting block, and a second lower nitrogen spring (13) is arranged at the bottom of the lower ejector rod (9).

4. The production mold of the blind screw hole structure prepared by sheet metal forming according to claim 3, characterized in that: the blank comprises a toothed rib and a stored material, the toothed rib forms a circle at the bottom of the plate material through ribbing, and the stored material is upset and extruded from the top of the plate material.

5. The production mold of the blind screw hole structure prepared by sheet metal forming according to claim 4, characterized in that: the spring force of the upper nitrogen spring (8) is greater than the sum of the spring forces of the first lower nitrogen spring (12) and the second lower nitrogen spring (13).

6. The production mold of the blind screw hole structure prepared by sheet metal forming according to claim 5, characterized in that: the punch fixing structure (6) comprises an upper die base, an upper backing plate and an upper fixing plate which are sequentially, parallelly and elastically connected from top to bottom, and the upper die base, the upper backing plate and the upper fixing plate form an upper half section which can move in time along with the press, a punch (14) is fixedly installed on one side, close to the upper backing plate, of the upper die base, and the punch (14) penetrates through a pressing structure (7) below;

the material pressing structure (7) comprises a discharging base plate and a discharging plate which are fixed from top to bottom to form a buffer section, a punch sheath (16) is installed in the discharging plate through a sheath positioning block (15), and a through hole penetrating through a punch (14) is formed in the punch sheath (16).

7. The production mold of the blind screw hole structure prepared by sheet metal forming according to claim 6, characterized in that: still be provided with rigidity spacing (17) in the lower mould subassembly, rigidity spacing (17) set up around the lower mould subassembly top.

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